JP6544642B2 - Fastening device - Google Patents

Description

  The present invention relates to a fastening device for fastening an object to be fastened.

  2. Description of the Related Art Conventionally, screw fasteners are used to fasten workpieces in various situations. The screw fastening body is an external thread body (male fastening body) in which a helical groove is formed on the outer periphery of a column, and an internal thread body (female fastening body) in which a spiral groove is formed on the inner periphery of the cylindrical member. It has a structure in which

  By the way, some to-be-fastened bodies can not be operated from both sides of the front and back. For example, when fastening a screw fastening body to a hole formed in a wall surface, although it can work from the front side of a wall surface, it may not be able to work from the back surface. In addition, when fastening the screw fastening body to a hole extending to the inside and outside of the circumferential surface of the column steel material and the pipe steel material, which are long, it is possible to work from the surface, but sometimes it is impossible to work from the inside. In such a case, a so-called one-side bolt is used which can realize the fastening operation including the other side by the fastening operation of only one side of the object to be fastened.

  In the conventional one-side bolt, by rotating the nut and the core pin relative to each other, the easily deformable valve sleeve inserted in the back side of the object is buckled by axially crushing it with the core pin and the grip sleeve. The diameter is expanded in the direction to function as a back washer (see Non-Patent Document 1).

Lobtex Fastening System Co., Ltd., Company WEB page "Home / Product Catalog 1 → One Side Bolt → Hack High Strength One Side Bolt", [online], [Search on April 29, 2015], Internet <URL http: // www .lobfs.com / pages / p47.html>

  The conventional one-wide bolt has a problem in that the nut and the core pin after fastening are gradually loosened in an environment where vibration and the like are severe, and the fastening force of the one-side bolt is weakened.

  The present invention has been made in view of the above-mentioned problems by intensive studies of the present inventor, and an object of the present invention is to provide a fastening device capable of suppressing a situation where fastening is loosened.

According to the present invention for achieving the above object, there are provided a holding portion disposed on the far side in the axial direction, and a first rotation portion and a second rotation portion disposed on the front side of the axial direction and capable of relative rotation with each other. In at least one of a power transmission unit disposed between the first and second rotation units and the holding unit to transmit an axial force, and at least one of the first rotation unit and the second rotation unit A back facing seat portion formed to face the back side and in contact with the member to be fastened, a back side engaging portion axially held between the power transmission portion and the holding portion, and the first rotation A screwing portion for converting relative rotation of the portion and the second rotation portion into relative movement of the holding portion and the transmission portion in the axial direction, and one direction of the first rotation portion and the second rotation portion And a reverse rotation preventing mechanism for permitting relative rotation and restricting relative rotation in the other direction, and relatively rotating the first rotation portion and the second rotation portion in the one direction, By bringing the holder and the transmission part close to each other in the axial direction, the back side engagement part protrudes outward in the radial direction from the sandwiching part and the transmission part and faces the front side facing the front side formed, using the above hands forward seat and the rear-facing seat, engage the workpieces, the said inner facing seat, around the workpieces and / or該奥facing seat Even if a rotational force along the relative rotational axis of the first and second pivoting parts acts between the existing external member, the back facing seat is engaged in the circumferential direction. The rotating engagement mechanism is formed by fitting the receiving recess formed in the to-be-fastened member and / or the external member and the back facing seat to each other. A fastening device characterized in that a directionally engaged state is maintained .
Further, according to the present invention for achieving the above object, there is provided a holding portion disposed on the far side in the axial direction, and a first turning portion and a second turning portion disposed on the near side in the axial direction and relatively rotatable with each other. A transmitting portion disposed between the first and second pivoting portions and the clamping portion to transmit an axial force, and at least at least the first and second pivoting portions. A back facing seat portion formed on one side facing the back side and in contact with the fastened member, a back side engaging portion axially held between the power transmission portion and the holding portion, and the first side A screwing portion for converting relative rotation of the rotation portion and the second rotation portion into relative movement of the holding portion and the transmission portion in the axial direction; one of the first rotation portion and the second rotation portion Reverse rotation preventing mechanism for permitting relative rotation in one direction and restricting relative rotation in the other direction, and relatively rotating the first rotation portion and the second rotation portion in the one direction; By bringing the clamping portion and the transmission portion axially close to each other, the back side engaging portion protrudes radially outward from the clamping portion and the transmission portion and faces the front side. To engage with the to-be-fastened member using the front facing seat portion and the back facing seat portion, and the back facing seat portion includes the periphery of the to-be-fastened member and / or the back facing seat portion. Between the first and second pivoting parts, and the back facing seat is engaged in the circumferential direction even if the rotational force along the relative rotation axis of the first and second pivoting parts acts The pivoting engagement mechanism to be held is configured, the back facing seat has a contact portion whose distance from the relative rotation axis is different along the circumferential direction in the periphery, and the contact portion is the above The above-mentioned rotation engagement mechanism is configured by abutting on the to-be-fastened member and / or the above-mentioned external member and engaging in the circumferential direction. A fastening device according to claim.

  In relation to the above-mentioned fastening device, the screwing portion is a female screw helical structure set to an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole portion of the cylindrical portion, and the circumference of the shaft portion An external thread spiral structure set to an appropriate lead angle and / or lead direction formed on the surface, and the reverse rotation preventing mechanism includes a shaft side unevenness formed on the peripheral surface of the shaft, Intermittently or continuously provided with a projecting portion provided on the cylindrical portion and extending radially inward toward the axial portion, and engaged with the axial portion side unevenness by the projecting end of the projecting portion A reverse rotation prevention portion constituting a flexible engagement edge, and the engagement edge of the reverse rotation prevention mechanism may be elastically deformed with the proximal end side as a fulcrum, and is relatively rotated in one direction It is characterized by moving while repeating the elastic deformation, and locking relative rotation in the other direction.

  In relation to the above-mentioned fastening device, the screwing portion is a female screw helical structure set to an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole portion of the cylindrical portion, and the circumference of the shaft portion And a first male screw helical structure set to an appropriate lead angle and / or lead direction formed on the surface, and the reverse rotation preventing mechanism includes the first male screw helical structure on the circumferential surface of the shaft portion A second male screw helical structure which is formed in a superimposed manner and has a lead angle and / or a lead direction different from the first male screw helical structure, and is provided on the cylindrical portion, and is directed radially inward toward the shaft portion Reverse rotation prevention part which comprises an intermittent or continuous engagement edge set to a lead angle and / or a lead direction which are different from the above-mentioned female screw spiral structure by the projection having an extension part extended to the And the engagement edge of the reverse rotation preventing mechanism is elastically deformed. It was obtained, the one direction to move while repeating the elastic deformation during the relative rotation, characterized in that to lock the relative rotation in the other direction.

  In relation to the fastening device, a receiving portion having a contact surface is formed on the end face of the cylindrical portion, and the reverse rotation preventing portion is configured to be disposed on the contact surface, When the contact surface is viewed by a cross section perpendicular to the axis, cross-sectional images of the contact surface are obtained at a plurality of circumferential positions of the axis and / or the cross-sectional image is obtained annularly. .

  A first circumferential engaging portion is formed in the receiving portion in relation to the fastening device, and the reverse rotation preventing portion is capable of circumferentially engaging with the first circumferential engaging portion. Two circumferential direction engaging portions are formed, and the cylindrical portion and the reverse rotation preventing portion are fixed in the circumferential direction by the first circumferential direction engaging portion and the second circumferential direction engaging portion. Do.

  In relation to the fastening device, the receiving portion is formed with a first axial engaging portion, and the reverse rotation preventing portion is engageable with the first axial engaging portion in the axial direction A second axial engaging portion is formed, and the cylindrical portion and the reverse rotation preventing portion are fixed in the axial direction by the first axial engaging portion and the second axial engaging portion. It features.

  In relation to the fastening device, the reverse rotation preventing mechanism is formed on the first rotating portion side unevenness formed on the first rotating portion and the second rotating portion to form the first rotating portion And a second rotation portion side unevenness engaged in the circumferential direction, and when relatively rotating in the one direction, the first rotation portion side unevenness and the second rotation portion side unevenness When relative movement is permitted and relative rotation is attempted in the other direction, the first rotating portion side unevenness and the second rotating portion side unevenness are engaged to prevent the relative movement.

  In relation to the above-mentioned fastening device, the above-mentioned rotation engagement mechanism is formed in the above-mentioned back facing seat part, and engages with the member side step part stepped in the direction of an axis in the above-mentioned to-be-fastened member and / or the external member. It has the rotation part side step part.

  According to the present invention, it is possible to suppress the situation in which the fastening is loosened.

The fastening apparatus which concerns on 1st embodiment of this invention WHEREIN: (A) Front sectional drawing which shows the state which fastened the to-be-fastened member, (B) It is front sectional drawing which shows a part of to-be-fastened member. In the fastening device, (A) a front sectional view in a state (contracted state) before fastening, (B) a front sectional view in a fastened state (expanded state), (C) showing a first rotation portion and a shaft portion Front view, (D) Top view of second rotation portion, (E) Second rotation portion, power transmission portion, back side engaging portion, front partial sectional view showing holding portion, (F) Second rotation It is a side surface fragmentary sectional view showing a part, a power transmission part, a back side engaging part, and a clamping part. (A) is a front view of the 2nd rotation part of the fastening device, (B) is a BB arrow sectional drawing of a front view, (C) is a front sectional view of a to-be-fastened member. It is a (A) front view of the reverse rotation prevention mechanism of a fastening device, and is a (B) top view. It is (A) front sectional drawing of the same reverse rotation prevention mechanism, and is (B) side sectional drawing. (A) top view of the cylinder part of the reverse rotation prevention mechanism, (B) front sectional drawing, (C) It is a front view. (A) top view of the same cylinder part, (B) side surface sectional view, (C) side view, (D) it is a fragmentary sectional view. (A) front view of the axial part of the same reverse rotation prevention mechanism, (B) sectional drawing of only a screw thread, (C) It is a top view. (A) Side view of coaxial part, (B) Cross-sectional view of only a thread, (C) It is a top view. (A) A front sectional view in the initial state showing the fastening action of the reverse rotation preventing mechanism, (B) A front sectional view when the cylinder is rotated 90 °, (C) when the cylinder is rotated 180 ° It is a front sectional view. It is front sectional drawing at the time of making a cylinder part rotate in a loosening direction in the reverse rotation prevention mechanism. It is front sectional drawing which shows the other structure of the same reverse rotation prevention mechanism. (A) is front sectional drawing which shows the other structure of the same cylinder part, (B) and (C) is a front view which shows the other structure of the same cylinder part. The (A) perspective view which shows the other structure of the cylinder part of the same reverse rotation prevention mechanism, (B) It is front sectional drawing. It is a fragmentary sectional view showing a reverse rotation prevention mechanism concerning a fastening device concerning a second embodiment of the present invention. It is (A) sectional drawing which shows the cylinder part used with the reverse rotation prevention mechanism, (B) front view, (C) bottom view. The front view of the 1st rotation part which concerns on 3rd embodiment of the fastening device and a axial part, (B) is a top view of a 2nd rotation part, (C) is a front view of a 2nd rotation part. It is a conceptual diagram which shows an effect | action of the saw blade of the reverse rotation prevention structure, (B)-(D) are conceptual diagrams which show the modification of a saw blade. (A)-(C) are conceptual diagrams which show the modification of the saw blade of the same reverse rotation prevention mechanism. In the fastening device according to the fourth embodiment of the present invention, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a CC arrow in the front view. A sectional view, (D) is a perspective view of a member to be fastened. In the fastening device according to the fifth embodiment of the present invention, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a CC arrow in the front view. A sectional view, (D) is a perspective view of a member to be fastened. In the fastening device according to the sixth embodiment of the present invention, (A) is a plan view of the second rotation portion, (B) is a front view of the second rotation portion, and (C) is a perspective view of the fastened member. is there. In a fastening device according to a modification of the sixth embodiment, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a perspective view of the fastened member. is there. In the fastening device according to the seventh embodiment of the present invention, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a CC arrow in the front view. A sectional view, (D) is a perspective view of a member to be fastened. In the fastening device according to the eighth embodiment of the present invention, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a perspective view of the fastened member. is there. In the fastening device according to the ninth embodiment of the present invention, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a perspective view of the fastened member. is there. In a fastening device according to a modification of the ninth embodiment, (A) is a plan view of the second rotating portion, (B) is a front view of the second rotating portion, and (C) is a perspective view of the fastened member. is there. In the fastening device according to the first configuration example of the present invention, (A) whole front partial cross-sectional view in the diameter reduction state, (B) whole front partial cross-sectional view in the diameter expansion state, (C) is a front partial cross-sectional view CC arrow sectional drawing, (D) is DD arrow sectional drawing of a front fragmentary sectional view. It is the whole front fragmentary sectional view in the diameter expansion state after conclusion of the fastening device. (A) and (C) are front partial sectional views near the back side engaging portion in the diameter reducing state according to a modification of the fastening device, and (B) and (D) are the back side engaging portion in the diameter expanding state It is a front fragmentary sectional view of the neighborhood. It is a front fragmentary sectional view near the back side engaging part in (A) diameter reduction state according to the modification of the fastening device, and (B) It is a front fragmentary sectional view near the back side engaging part in a diameter expanding state. In a modified example of the fastening device, (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a front partial sectional view of the whole in the reduced diameter state, (C) the back side engaging portion in the expanded diameter state Plan view of the whole, (D) a front partial sectional view of the whole in a diameter-expanded state, (E) is an EE arrow sectional view of the front partial sectional view, (F) is an F-F arrow sectional view of the front partial sectional view FIG. It is the whole front fragmentary sectional view in the diameter expansion state after conclusion of the fastening device. (A) A plan view of the back side engaging portion in the reduced diameter state according to a modification of the fastening device, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, (C) in the expanded diameter state It is a top view of the back side engaging part, (D) It is a front fragmentary sectional view near the back side engaging part in a diameter-expanded state. (A) A plan view of the back side engaging portion in the reduced diameter state according to a modification of the fastening device, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, (C) in the expanded diameter state It is a top view of the back side engaging part, (D) It is a front fragmentary sectional view near the back side engaging part in a diameter-expanded state. (A) is a plan view of the back side engaging portion in the reduced diameter state according to a modification of the fastening device, and (B) is a B-B arrow plane of (C) of the back side engaging portion in the reduced diameter state Sectional view, (C) is a partial cross-sectional view taken along the line C-C in (A) near the back side engaging portion in the reduced diameter state, (D) is in the vicinity of the back side engaging portion in the reduced diameter state DD partial front view in the direction of arrows DD, (E) is a plan view of the back side engaging portion in the enlarged diameter state, and (F) is an F-F arrow of (G) in the back side engaging portion in the expanded diameter state (G) is a front partial cross-sectional view taken along the G-G arrow of (E) near the back side engaging portion in the enlarged diameter state, and (H) is near the back side engaging portion in the enlarged diameter state It is the HH arrow front fragmentary sectional view of E). It is a front fragmentary sectional view near the back side engagement part in the diameter reduction state (A) concerning a modification of the fastening device, and a front fragmentary sectional view near the back side engagement part in the diameter expansion state (B). It is a front fragmentary sectional view near the back side engagement part in the diameter reduction state (A) concerning a modification of the fastening device, and a front fragmentary sectional view near the back side engagement part in the diameter expansion state (B). It is a front fragmentary sectional view near the back side engagement part in the diameter reduction state (A) concerning a modification of the fastening device, and a front fragmentary sectional view near the back side engagement part in the diameter expansion state (B). It is the whole front fragmentary sectional view in the diameter reduction state (A) concerning the modification of the fastening device, and the whole front fragmentary sectional view in the (B) diameter expansion state. It is the whole front fragmentary sectional view in the diameter reduction state (A) concerning the modification of the fastening device, and the whole front fragmentary sectional view in the (B) diameter expansion state. It is the whole front fragmentary sectional view in the diameter reduction state (A) concerning the modification of the fastening device, and the whole front fragmentary sectional view in the (B) diameter expansion state. It is the whole front fragmentary sectional view in the diameter reduction state (A) concerning the modification of the fastening device, and the whole front fragmentary sectional view in the (B) diameter expansion state. (A) is a whole front partial cross-sectional view according to the same fastening device of the second configuration example of the present invention, in which the right half is contracted and the left half is expanded; It is a whole front fragmentary sectional view and a bottom view which become a diameter expansion state where a right half is diameter reduction state and a left half based on the modification of an apparatus. (A) is a front partial cross-sectional view of the sandwiching portion, the back side engaging portion, and the power transmission portion according to the fastening device; (B) is a sandwiching portion, the back side engaging portion, according to a modification of the fastening device Front view of power transmission part, and BB arrow sectional view of front view, (C) is a front view of clamping part, back side engaging part and power transmission part according to a modification of the fastening device, and front It is CC arrow sectional drawing of a figure. (A) is a front view of a holding part, a back side engaging part, and a power transmission part according to a modification of the fastening device, and an AA arrow sectional view of the front view; (B) is a modification of the fastening device They are a front view of a clamping part, a back side engaging part, and a transmission part based on an example, and a BB arrow sectional view of a front view. They are a front view of a clamping part, a back side engaging part, and a power transmission part which concern on the modification of the fastening device, a side view, and an AA arrow sectional view of a front view. They are a front view in the middle of the process of production of a pinching part, a back side engaging part, and a power transmission part concerning the modification of the fastening device, a front view after completion of production, and an AA arrow sectional view of a front view. (A) A front partial sectional view of the whole in a diameter-reduced state according to a modification of the fastening device, (B) A front sectional view showing only a modification of the transmission portion, (C) Only a modification of the transmission portion It is a front sectional view. (A)-(C) front sectional view showing only the power transmission portion, (D) plan view showing only the power transmission portion, front sectional view and XX cross sectional plan view according to a modification of the fastening device (E) It is the top view which shows only a transmission part, a front view, and a right view. It is a front view in the diameter reduction state (A) concerning the modification of the fastening device, the back view in the (B) diameter reduction state, and the side view in the (C) diameter reduction state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening apparatus. The front view in the (A) diameter-expanded state which concerns on the modification of the fastening device, the back view in the (B) diameter-expanded state, and the side view in the (C) diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening apparatus. The (A) perspective view which shows the components of the back side engaging part which concerns on the modification of the fastening device, (B) Top view or a bottom view, (C) It is a side view. (A) The front view in a diameter-reduction state which concerns on the modification of the fastening device, (B) The rear view in a diameter-reduction state, (C) It is a side surface fragmentary sectional view in a diameter-reduction state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening apparatus. It is the front view in the (A) diameter-expanded state which concerns on the modification of the fastening device, (B) the back view in the diameter-expanded state, (C) It is the side surface fragmentary sectional view in the diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening apparatus. It is the (A) section perspective view showing the clamping part concerning the modification of the fastening device, (B) perspective view, (C) front view, (D) front sectional view, (E) bottom view. (A) perspective view, (B) side view, (C) front view or rear view, (D) top view or bottom view, (E) showing parts of the back side engaging portion according to a modification of the fastening device It is a rear view or a front view. The (A) top view which shows the transmission part which concerns on the modification of the fastening device, (B) Side view, (C) Front view, (D) It is a perspective view. It is a front fragmentary sectional view near the back side engagement part in the diameter reduction state (A) concerning a modification of the fastening device, and a front fragmentary sectional view near the back side engagement part in the diameter expansion state (B). The (A) perspective view which shows the PCCP shell structure which concerns on the modification of the fastening device, (B) front view, (C) It is an upper surface figure, and the expansion-contraction pipe structure which shows the modification of the fastening device. It is a figure, (E) Front view, (F) It is a top view and is a perspective view showing these contraction states (G) It is a perspective view of a power transmission part etc. which applied these structures (H) thru / or (L) It is. (A) to (C) and (E) are front sectional views showing a second rotation portion, a power transmission portion, a back side engagement portion, and a clamping portion according to a modification of the fastening device, (D ) Is a perspective view of the same part, and (F) is a perspective view concerning a modification of the fastening device.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

  FIG. 1 shows a fastening device 1 according to a first embodiment. Here, as the to-be-fastened member H, a cylindrical tubular member H1 and a bracket H2 fixed to the outer periphery of the tubular member H1 are illustrated, and a case where these are fastened by the fastening device 1 will be illustrated. A hole hp1 for fastening is formed in the tubular member H1. The bracket H2 includes a plate-like base plate h10 that is curved along the outer peripheral surface of the tubular member H1, and a column member h20 that is provided upright on the base plate h10. A fastening hole hp2 is formed in the base plate h10. The fastening device 1 is inserted into the through hole HP in which the hole hp1 of the tubular member H1 and the hole hp2 of the bracket H2 are aligned, and these are fastened. In addition, although the case where the tubular member H1 and the bracket H2 were fastened was illustrated here, this invention is not limited to this.

  The fastening device 1 includes a shaft 5 extending in the axial direction, a holding unit 10 disposed on the back side of the shaft 5 in the axial direction, and a first rotating unit 15 disposed on the front side of the shaft 5 in the axial direction. A second rotation unit 20 disposed on the front side and rotating relative to the first rotation unit 15, and a power transmission unit disposed closer to the sandwiching unit 10 than the second rotation unit 20 to transmit an axial force And a back side engaging portion 60 axially held between the power transmission portion 25 and the holding portion 10.

  In the present embodiment, the second rotation unit 20, the power transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed in the axial direction. Moreover, the power transmission part 25, the back side engaging part 60, and the clamping part 10 are integrally comprised by the single cylindrical member. Therefore, it is possible to transmit the rotational power applied to the second rotation unit 20 from the outside to the holding unit 10. Moreover, although the case where these components or members are comprised with a metal is illustrated in this 1st embodiment, you may comprise with members other than a metal, and you may comprise combining different materials.

  The first pivoting portion 15 engages with an unillustrated tightening tool and receives turning power from the closing tool. There are various ways to engage with the tightening and loosening tool. For example, in order to engage with the spanner, the outer shape of the first rotating portion 15 is a hexagon, or a polygon including a convex and a concave. It may be a multi-faceted shape, and in order to engage with a clamping tool such as a hexagonal wrench, a hole having a shape corresponding to the clamping tool such as a hexagonal hole or a hexagonal wrench may be formed on the end face of the first rotating portion 15 Just do it. Here, an engagement hole for a hexagonal wrench is formed.

  The second rotating portion 20 engages with the member side seat portion HX of the fastened member H and receives the reaction force (rotational force). The engagement structure will be described in detail later. Thus, the second pivoting part 20 does not have to be engaged by the tightening and loosening tool. Of course, it may be possible to supplementarily engage with the fastening tool, and there are various methods, for example, in order to engage with the spanner, the outer shape of the second turning portion 20 is non-circular ( For example, it may be a hexagon, an ellipse, or an oval. Here it is oval.

  The first pivoting portion 15 and the second pivoting portion 20 rotate relative to each other and engage in the axial direction. In the present embodiment, the front end face 22 of the second rotating portion 20 and the back facing seat 16 of the first rotating portion 15 axially engage.

  Here, the first pivoting portion 15 is integrally provided at the front end of the shaft portion 5 here. Therefore, the first rotation unit 15 and the shaft unit 5 rotate together. The shaft 5 is a cylindrical member (not necessarily cylindrical but may be solid or hollow as long as it has a columnar shape), and the pinching portion 10 or screwing An axial force that acts on the portion 30 (details will be described later) and the first rotating portion 15 and the like is transmitted. In the present embodiment, the shaft portion 5 transmits an axial force between the sandwiching portion 10 and the screwing portion 30 formed on the shaft portion 5 itself. The shaft portion 5 is set to be longer than the thickness of the fastened member H.

  The sandwiching portion 10 is a member disposed, for example, in a cylindrical shape on the outer peripheral side of the shaft portion 5. A screwing portion 30 is formed between the shaft portion 5 and the holding portion 10. Specifically, the screwing portion 30 is formed on the inner periphery of the holding portion 10 (see FIG. 2E) and on the outer periphery of at least the back side of the shaft portion 5 so that the female screw portion 31 and the screw are screwed. And the male screw part 32 (refer FIG.2 (C)) to match. Therefore, the holding part 10 becomes a cylindrical internal thread body, and the axial part 5 becomes an external thread body.

  The second pivoting portion 20 has a back facing seat 21 facing the back side (the back side engaging portion 60 side). The back facing seat portion 21 is integrated with the power transmission portion 25 and abuts on the front side surface (member side seat portion HX) of the member H to be fastened.

  The second rotation unit 20 rotates together with the power transmission unit 25, the back side engagement unit 60, and the holding unit 10 by being integrated. Therefore, when the second pivoting portion 20 is pivoted, the sandwiching portion 10 pivots via the power transmission portion 25 and the back side engaging portion 60. When the first and second rotating parts 15 and 20 rotate relative to each other, the relative rotation is converted by the screwing part 30 into relative movement of the holding part 10 and the transmission part 25 in the axial direction.

  The power transmission portion 25 is a substantially cylindrical sleeve member here, and the shaft portion 5 is inserted therein. The length of the power transmission portion 25 is set equal to or greater than the thickness of the fastened member H, and set shorter than the shaft portion 5. The power transmission unit 25 is disposed between the second rotation unit 20 and the rear engagement unit 60, and transmits an axial force like a so-called stick. Although the case where the 2nd rotation part 20, the transmission part 25, and the back side engaging part 60 are integral is illustrated here, both may be separate bodies.

  The maximum outer diameter of the power transmission portion 25, the maximum outer diameter of the holding portion 10, and the maximum outer diameter of the back side engaging portion 60 before the diameter expansion are set to be equal or approximate. This is because it is necessary to insert all of these into the hole HP of the fastened member H from the near side.

  The back side engaging portion 60 is a deformation sleeve in this case, and can be easily buckled radially outward, and the side surface of the deformed sleeve after deformation is utilized by expanding the diameter radially outward. The hand forward seat 64 is made to appear. As a result, the fastening device 1 can be fastened to the to-be-fastened member H using the forward facing seat portion 64 of the back side engaging portion 60 and the back facing seat portion 21 of the second rotating portion 20. .

  Next, the engaged state of the second rotation portion 20 and the seat portion HX of the fastened member H will be described.

  Between the back facing seat 21 of the second pivoting portion 20 and the member side seat HX of the member H to be fastened, along the relative rotation axis of the first pivoting portion 15 and the second pivoting portion 20 The rotational engagement mechanism Z is configured to be held in the state of circumferentially engaging each other even when a rotational force is applied.

  The back facing seat portion 21 and the member side seat portion HX form a substantially congruent planar region, contact each other, and transmit the axial force of the second rotation portion 20 to the fastened member H.

  As shown in FIG. 3, the pivoting engagement mechanism Z has a pivoting portion side inclined surface 21 a formed on the back facing seat 21 and a member side inclined surface HXa formed on the member side seat HX. .

  As shown in FIG. 3 (B), the rotating portion-side inclined surface 21a is formed by a part (sectional line G) of the contour of the axis-perpendicular section at an appropriate position on the axis of the relative rotation axis S or the through hole HP. A non-round state with reference to the heart, that is, the distance from the axis is displaced. Of course, the member side inclined surface HXa which abuts on the rotating portion side inclined surface 21a is also the same.

  In the present embodiment, both of the member-side inclined surface HXa and the pivoting-part-side inclined surface 21a are virtual cylinders having an axis inclined with respect to the relative rotation axis S (an axis of the tubular member H1 in the present embodiment). It is composed of a curved surface including a partial circumference.

  In more detail, the rotating portion side inclined surface 21a is a first rotating portion side inclined region 21ax opposed to one rotation direction X of the relative rotation axis S, and a second rotating portion side opposed to the other rotation direction Y And an inclined area 21ay. Further, although not particularly illustrated, the member-side inclined surface HXa also includes a first member-side inclined region facing in the rotational direction X and a second member-side inclined region facing in the rotational direction Y. Note that the inclined region facing in the rotational direction X can engage with the mating member in the circumferential direction when the inclined region moves in the rotational direction Y by itself. Similarly, the inclined region facing in the rotational direction Y can engage with the other member when it moves in the rotational direction X.

  For example, in the case where the first rotation portion 10 and the shaft portion 5 are right-handed, when the first rotation portion 10 and the shaft portion 5 are rotated in the rotational direction X for fastening, the second rotation portion 20 itself is moved to the member side seat HX accordingly. On the other hand, it is attempted to rotate in the rotational direction X, but as a result, the second rotating portion side inclined region 21ay and the first member side inclined region mutually engage in the circumferential direction, and the relative rotation is suppressed. Similarly, when the first pivoting portion 10 and the shaft portion 5 are loosened in the rotational direction Y when the right-handed screw is used, the second pivoting portion 20 itself tends to rotate in the rotational direction Y accordingly. One rotation member side inclination area 21ax and the second member side inclination area are engaged in the circumferential direction, and the relative rotation is suppressed.

  In addition, although the 1st rotation part side inclination area | region 21ax and the 2nd rotation part side inclination area | region 21ay in the rotation part side inclination surface 21a become a continuous curved surface, the singular point or the singular line (this In the embodiment, singular lines) U1, U2 may be present. One singular line U1 is completely parallel to the radial direction. The other singular line U2 extends in the radial direction but is displaced (curved) in the direction of the relative rotation axis S.

  In addition, although the structure in which accompanying rotation of the 2nd rotation part 20 is suppressed is illustrated here, when the 1st rotation part 15 rotates to bidirectional X and Y, this invention is limited to this I will not. It is sufficient to prevent relative rotation between the second rotating portion 20 and the fastened member H when at least the first rotating portion 15 is about to rotate in the fastening direction (here, clockwise direction).

  Next, with reference to FIGS. 4 to 14, the reverse rotation preventing mechanism V will be described, which prevents the relative rotation of the screwing portion 30 in the loosening direction.

  As shown in FIGS. 8 and 9, the male screw portion 32 of the shaft portion 5 corresponds to a first male screw spiral structure 1400 which is a right screw configured to be able to screw a female screw spiral wound as a right screw. Two types of external thread spiral structures are formed on the same area so as to overlap with a second external thread spiral structure 1500 which is a left thread configured as a left thread capable of being screwed with an internal thread spiral thread formed as a left thread.

  In the male screw portion 32, as shown in FIG. 8C, a substantially crescent-shaped screw thread 1300a extending in the circumferential direction in the surface direction perpendicular to the axial center (relative rotation axis) S is one side of the male screw portion 32. They are alternately provided on the left side of the figure and on the other side (right side of the figure). By configuring the screw thread 1300a in this way, a helical structure (refer to arrow 1400 in FIG. 8A) pivoting clockwise and a helical structure (refer arrow 1500 in FIG. 8A) pivoting counterclockwise. Two types of spiral grooves can be formed between threads 1300a.

  In this embodiment, by doing this, two types of external thread spiral structures of the first external thread spiral structure 1400 and the second external thread spiral structure 1500 are formed in the external thread portion 32. Therefore, the male screw portion 32 can be screwed with any female screw body of the right screw and the left screw. In addition, for details of the male screw portion 23 in which two types of male screw helical structures are formed, refer to Japanese Patent No. 4663813 according to the inventor of the present application.

  As shown in FIG. 6 and FIG. 7, the sandwiching portion 10 has a cylindrical portion 1060 and a reverse rotation preventing portion 1600. The cylindrical portion 1060 has a through hole portion 1060 a at the center. The through hole 1060 a is formed with a first female screw helical structure 1140 as a right-handed screw. That is, the first female screw spiral structure 1140 of the cylindrical portion 1060 engages with the first male screw spiral structure 1400 in the male screw portion 32 of the shaft portion 5.

  The cylindrical portion 1060 has a receiving portion 1100. The receiving portion 1100 is formed on an axial end surface of the cylindrical portion 1060, and has an abutting surface 1100a which is substantially perpendicular (not necessarily perpendicular) to the relative rotation axis S. Here, the contact surface 1100 a is a ring-shaped flat surface, and contacts the seat portion 1620 of the reverse rotation preventing portion 1600 to axially receive the reverse rotation preventing portion 1600. The ring-shaped contact surface 1100a may be formed to be recessed in the axial end surface.

  Furthermore, the receiving portion 1100 has a first circumferential engaging portion 1200 and a first axial engaging portion 1300. As shown in FIG. 6 (B), the first circumferential engaging portion 1200 is a protrusion that protrudes in the axial direction with respect to the contact surface 1100a here, and two first circumferential engaging portions 1200 are formed at an interval of 180 ° in the circumferential direction. It is formed. Of course, the first circumferential engaging portion 1200 may be provided, although not essential, dispersed at a plurality of locations in the circumferential direction. The first circumferential engaging portion 1200 is engaged with the second circumferential engaging portion 1620a of the reverse rotation preventing portion 1600 so as to engage in the circumferential direction, and regulates the relative rotation in the circumferential direction. Here, although the first circumferential engaging portion 1200 is made to project relative to the contact surface 1100a, it may be recessed. In addition, the first circumferential engaging portion 1200 may be convex or concave in the axial direction. For example, as its case, it is also preferable to form irregularities such as embossing and knurling, and radial grooves on the contact surface 1100 a itself.

  As shown in FIG. 7B, the first axial engagement portion 1300 is a member disposed opposite to the contact surface 1100a in a state having a minute gap. A plate-like seat portion 1620 (second axial engagement portion 1620 b) of the reverse rotation prevention portion 1600 is disposed in the gap. The abutment surface 1100a and the first axial engaging portion 1300 sandwich the seat portion 1620, and the first axial engaging portion 1300 axially engages with the second circumferential engaging portion 1620b. In addition, as shown in FIG. 7D, the first axial engaging portion 1300 is a peripheral wall portion extending substantially perpendicularly to the receiving portion 1100 before assembly. The circumferential wall portion is erected in the circumferential direction along the outer peripheral edge of the seat portion 1620 of the reverse rotation preventing portion 1600. At the time of assembly, after arranging the reverse rotation preventing portion 1600, as shown by the dotted line, the first axial engaging portion 1300 is bent inward in the radial direction, and both are axially fastened by caulking each other. . Although the first axial direction engaging portion 130 exemplarily shows a case where peripheral wall portions having a range of about 90 ° in the circumferential direction are provided at two places, for example, as shown in FIG. It is also preferable to arrange over the circumference (360 °), and it is also preferable to arrange intermittent peripheral wall-like parts over the entire circumference.

  Next, the reverse rotation prevention unit 1600 will be described. The reverse rotation prevention unit 1600 includes a seat portion 1620, a standing portion 1650, and a protrusion 1680.

  As shown in FIG. 7A, the seat surface portion 1620 is a ring-shaped plate portion that abuts on the contact surface 1100a of the receiving portion 1100, and the second axial direction engaging portion 1620b is partially and / or entirely. Configure The second axial engagement portions 1620b axially engage with each other by being held by the first axial engagement portion 1300 (overlap in the axial direction). The seat portion 1620 is preferably in contact with the contact surface 1100 a of the receiving portion 1100 in an angular range of 180 ° or more, for example, 360 ° in the circumferential direction to stabilize the posture and to obtain the first axial engagement. An engagement state with the joint portion 1300 is maintained.

  A second circumferential engaging portion 1620 a is formed on the outer peripheral edge of the seat portion 1620. The second circumferential engaging portion 1620a has a concave notch that is displaced inward in the radial direction of the outer peripheral edge of the seat portion 1620, and circumferentially engages with the first circumferential engaging portion 1200 of the receiving portion 1100. Do. In addition, although the notch which becomes concave in a radial direction inner side is illustrated here, it may be a projection which becomes convex in the radial direction outer side, may be convex shape or concave shape in an axial direction, and is not essential. As an example in which the second circumferential engaging portion 1620a is convex or concave in the axial direction, an unevenness such as embossing, knurling, or radial grooves is formed on a plane facing the contact surface 1100a in the seat portion 1620. Is also preferred.

  As shown in FIG. 7B, the standing portion 1650 is a substantially cylindrical portion extending in the axial direction from the seat portion 1620. The axial extension distance J gradually increases (or decreases) along the circumferential direction. As a result, the edge 1650a opposite to the seat portion 1620 in the standing portion 1650 is inclined with respect to the seat portion 1620, and the inclination angle α is set corresponding to the lead angle of the second external thread spiral structure 1150. Be done. That is, the edge 1650a is a spiral extending in the range of about 360 ° in the circumferential direction. In the standing portion 1650, an axial notch 1650b may be formed, and in the case where the notch 1650b is formed, the standing portion 1650 is elastically deformed radially outward by positively reducing the rigidity in the radial direction. It can be done easily. Here, although the notches 1650b are formed at two places in the circumferential direction, they may be formed at one place, three or more places, or 0 places.

  The protrusion 1680 is a plate that protrudes radially inward from the end edge 1650 a of the standing portion 1650. As shown in FIG. 6A, the protrusion 1680 is formed by extending the notch 1650 b of the standing portion 1650 or by forming a recess formed by notching radially outward from the end of the protrusion 1680. And a partial arc-shaped plate part which is divided at two places in the circumferential direction and has an angle range of about 180 ° or less. The radially inner side of each protrusion 1680 is a point, and a plurality of engagement edges 1680 a are configured. As a result, each engagement edge 1680a becomes a partial arc of an angular range of 180 ° or less in the circumferential direction, and contacts the outer periphery of the shaft portion 5. In this manner, by setting the circumferential distance of each engagement edge 1680a to 180 ° or less, it becomes easy to displace radially outward. The diameter of the engagement edge 1680 a is substantially the same as the valley diameter of the second male screw spiral structure 1500 of the shaft 5.

  Further, the projecting portion 1680 is inclined in the radial direction such that the inner side is away from the imaginary plane formed by the seat portion 1620. The radial inclination angle β substantially matches the flank angle of the thread 1300 a of the second external thread spiral structure 1500 of the shaft 5 and is set to about 30 ° here. Further, the engagement edge 1680a is formed with a left-handed second internal thread spiral structure 1150 which becomes the lead angle α along with the inclination angle α of the end edge 1650a of the standing portion 1650. The engagement edge 1680 a is screwed with the second male screw helical structure 1500 in the male screw portion 32 of the shaft 5.

  Next, the operation of the reverse rotation preventing mechanism V will be described.

  As shown in FIG. 10A, when the first internal thread spiral structure 1140 of the cylindrical portion 1060 of the holding portion 10 is screwed to the first external thread spiral structure 1400 of the shaft portion 5, the reverse rotation prevention portion 1600 is obtained. The engagement edge 1680 a contacts the second externally threaded helical structure 1500 of the shank 5. However, when the tubular portion 1060 is screwed on the basis of the first female screw helical structure 1140, the engagement edge 1680a and the thread of the second male screw helical structure 1500 transition to the interference state.

  In this state, when the cylindrical portion 1060 is further rotated by 90 ° and the first female screw helical structure 1140 is screwed to the first male screw helical structure 1400, as shown in FIG. 10B, the cylindrical portion 1060 The 1⁄4 pitch travels in the fastening direction, and the reverse rotation prevention unit 1600 also forcibly travels in the fastening direction while rotating in the same direction. At this time, since the engagement edge 1680a is inclined in the direction away from the seat portion 1620, it is elastically deformed axially and / or radially outward away from the contact surface 1100a along the flank surface of the thread 1300a. And try to get over the second male screw spiral structure 1500. At this time, preferably, the erected portion 1650 enhances the rigidity of the radially outer side, so that the amount by which the erected portion 1650 itself elastically deforms outward is set small or substantially zero, and the engaging edge 1680a is erected. Prioritizing elastic deformation to the obtuse angle side with respect to the setting portion 1650 is prioritized. When the cylindrical portion 1060 is rotated by 180 ° (1/2 pitch) on the basis of the state of FIG. 10A, as shown in FIG. 10C, the engagement edge 1680a is one of the second male screw spiral structure 1500. Completely pass over the two screw threads 1300a and engage with the next second male screw helical structure 1500. By repeating this operation, the engaging portion 1680a gets over the thread 1300a of the second male screw helical structure 1500 every time the gripping portion 10 rotates relative to 180 °, and the gripping portion 10 is screwed to transmit power. Approach 25. As a result, the back side engaging portion 60 buckles radially outward, and the hand-front seat 64 is developed. The fastening device 1 can be fastened to the to-be-fastened member H using the forward facing seat portion 64 of the back side engaging portion 60 and the back facing seat portion 21 of the second rotating portion 20.

  On the other hand, referring to FIG. 11, a case is considered where cylindrical portion 1060 of sandwiching portion 10 tries to rotate in the loosening direction with respect to first male screw spiral structure 1400 of shaft portion 5. The projecting portion 1680 has an inclined shape so that the tip side (engaging edge 1680a side) deviates from the virtual plane formed by the abutting surface 1100a, and this inclination corresponds to that of the second male screw spiral structure 1500. It is set to correspond to the flank surface of the thread 1300a and is preferably set to abut. Further, the length from the base end (the end edge 1650a of the standing portion 1650) to the tip end (the engagement edge 1680a) of the projection 1680 is set corresponding to the distance from the top to the valley bottom of the thread 1300a. Preferably, it is set to substantially match the distance.

  Therefore, when relative rotation in the loosening direction is given to the cylindrical portion 1060 of the sandwiching portion 10, the inclined surface of the projecting portion 1680 approaches the virtual plane formed by the abutting surface 1100a with respect to the standing portion 1650 (ie, In the direction in which the engagement edge 1680a approaches the contact surface 1100a), the force is elastically deformed. By increasing the rigidity of the standing portion 1650 outward in the radial direction, the distance (horizontal distance in FIG. 11) in the virtual plane direction from the base end to the tip of the protrusion 1680 becomes longer along with the elastic deformation. Therefore, the engagement edge 1680a acts to narrow the valley of the thread 1300a, and as a result, the relative rotation in the loosening direction can be mechanically and firmly prevented. In other words, the engagement edge 1680a of the reverse rotation preventing portion 1600 bites into the valley of the screw thread 1300a of the second male screw helical structure 1500, and the relative rotation is caused by displacement or reciprocity of the cylindrical portion 1060 and the reverse rotation preventing portion 1600. regulate. Therefore, the shaft 5 can not rotate relative to the loosening direction. The reverse rotation preventing portion 1600 allows relative rotation with the shaft portion 5 in one direction (fastening direction) by the first female screw helical structure 1140 of the cylindrical portion 1060, and the reverse rotation is reliably locked. In the holding unit 10, the extension length of the protrusion 1680, ie, the setting of the protrusion length, the setting of the setting length of the standing portion 1650, the setting of the relative angle between the protruding portion 1680 and the standing portion 1650, etc. The projection 1680 can be elastically deformed by applying a loosening direction torque greater than or equal to a predetermined value, and the shaft 5 and the holding portion 10 can be loosened relatively easily.

  According to the fastening device 1 of the present embodiment described above, since the reverse rotation preventing mechanism V is provided, the screwing portion 30 is relatively rotated in the fastening direction to bring the holding portion 10 and the power transmission portion 25 closer to each other. After the side engagement portion 60 has developed the hand-front seat portion 64, relative rotation in the loosening direction of the screwing portion 30 can be restricted. As a result, even if the screwing portion 30 is loosened by vibration or external force, it becomes difficult to actually loosen, so the state in which the holding portion 10 and the power transmission portion 25 approach, that is, the fastening state of the fastening device 1 It becomes possible to maintain over a period of time.

  In particular, according to the reverse rotation preventing mechanism V, in a range including the contact surface 1100a of the receiving portion 1100 of the sandwiching portion 10, the cross-sectional image of the contact surface 1100a is circumferential when viewed in a cross section perpendicular to the axis. A state obtained at a plurality of directions and / or a cross-sectional image can be obtained annularly. Therefore, the holding posture of the reverse rotation preventing portion 1600 by the contact surface 1100a is stabilized, so that the assembly can be easily performed, and the assembly accuracy can also be improved. In the present embodiment, since the cross-sectional image of the contact surface 1100a is annular (ring-shaped), it can be said that the most stable state is obtained.

  Furthermore, as in the present embodiment, when the contact surface 1100a is a flat surface perpendicular to the rotation axis at the end face of the cylindrical portion 1060, the cylindrical portion 1060 is simplified by pressing, cutting, rolling, heading, molding, or the like. Mass production. When the contact surface 1100a is inclined with respect to the direction perpendicular to the axis and the contact surface 1100a is used to form the lead angle and lead direction of the engagement edge 1680a in the circumferential slope direction, The manufacturing cost of the tubular portion 1060 is increased. Furthermore, when viewed in cross section in the direction perpendicular to the axis within the range including the sloped contact surface 1100a, only one cross-sectional image can be obtained in the circumferential direction. This is because the holding posture of the reverse rotation preventing portion 1600 by the contact surface 1100a is unstable, and a force that causes the reverse rotation preventing portion 1600 to slide in the circumferential direction along the slope is easily generated. As a result, when assembling the cylindrical portion 1060 and the reverse rotation prevention portion 1600, high positioning accuracy is required.

  Incidentally, in the present embodiment, the lead direction and the lead angle of the second female screw helical structure 1150 are set by the standing portion 1650 in which the axial extension distance J gradually increases along the circumferential direction. If this structure is adopted, for example, the reverse rotation preventing portion 1600 can be mass-produced by press molding using a plate-like member or the like, and the manufacturing cost can be dramatically reduced.

  In addition, although the main clamping unit 10 is not essential, the first circumferential engaging portion 1200 on the side of the cylindrical portion 1060 and the second circumferential engaging portion 1620a on the side of the reverse rotation preventing portion 1600 make reverse rotation with the cylindrical portion 1060 The prevention unit 1600 can be fixed in the circumferential direction. As a result, the relative rotation of the cylindrical portion 1060 and the reverse rotation preventing portion 1600 can be restricted even when the fastening edge is forcedly caused while causing the engagement edge 1680a of the reverse rotation preventing portion 1600 to interfere.

  Similarly, the cylindrical portion 1060 and the reverse rotation preventing portion 1600 are axially fixed by the first axial engaging portion 1300 on the side of the cylindrical portion 1060 and the second axial engaging portion 1620b of the reverse rotation preventing portion 1600. There is. As a result, even when the cylindrical portion 1060 is forcibly screwed in and the engagement edge 1680a of the reverse rotation preventing portion 1600 is displaced in the radial direction, the cylindrical portion 1060 and the reverse rotation preventing portion 1600 are prevented from being separated in the axial direction it can. In the present embodiment, since the first axial engaging portions 1300 are bent and caulked with each other at the time of assembly, both can be surely integrated despite the simple manufacturing process.

  In particular, the seat portion 1620 of the reverse rotation preventing portion 1600 of the present embodiment is in contact with the contact surface 1100 a of the receiving portion 1100 at least in the angular range of 180 ° or more in the circumferential direction. As described above, when the seat portion 1620 is set to an angle range of 180 ° or more, even when an external force acts on the reverse rotation preventing portion 1600, the engagement state with the first axial direction engaging portion 1300 is hardly released. On the other hand, the engaging edge 1680a of the reverse rotation preventing portion 1600 is allowed to be flexibly displaced outward in the axial direction and / or the radial direction by making contact with the shaft portion 5 in an angular range of 180 ° or less in the circumferential direction. Can do. That is, according to the reverse rotation preventing portion 1600 of the present embodiment, the engagement edge 1680a can be easily displaced while being integrated with the cylindrical portion 1060 with certainty. Further, at this time, by arranging a plurality of engaging edges 1680a in the circumferential direction, when the gripping portion 10 rotates in the loosening direction, the plurality of engaging edges 1680a reliably engage with the shaft portion 5, and It can regulate the rotation. Further, since the angular relationship between the engaging edge 1680a and the standing portion 1650 is set at an obtuse angle, the engaging edge 1680a is elastic in the axial direction away from the standing portion 1650 (the direction in which the angular relationship between the two approaches 180 °). Although it is easy to deform, there is an advantage that it is difficult to elastically deform in the axial direction (the relationship between the both approaches 90 °) approaching the standing portion 1650.

  In the shaft portion 5 and the sandwiching portion 10 of the above embodiment, the first male and female screw helical structures 1400 and 1140 and the second male and female screw helical structures 1500 and 1150 have mutually reverse threads (the lead angles are the same). Although the case where the read direction is opposite is illustrated, the present invention is not limited thereto. For example, as shown in FIG. 12, it is also possible to adopt first male and female screw helical structures 1400 and 1140 having the same lead direction but different lead angles, and second male and female screw helical structures 1500 and 1150. In this case, by forming a second external thread spiral structure 1500 further on the helical thread 1300a formed by the first external thread spiral structure 1400, the first external thread spiral structure having a lead L1 (lead angle θ1) is obtained. A second male screw helical structure 1500 having 1400 and a lead of L2 (lead angle θ2) can be formed with the screw directions aligned.

  Furthermore, in the reverse rotation preventing mechanism V of the above embodiment, the cross-sectional image of the axis perpendicular cross-section in the range including the contact surface 1100a is illustrated as a planar ring shape coinciding with the contact surface 1100a. It is not limited to. For example, as in the reverse rotation preventing mechanism V shown in FIG. 13A, the contact surface 1100a can be a tapered surface which is inclined in the radial direction. In this case, the cross-sectional image of the axis perpendicular cross section XX is an annular line. Furthermore, as in the reverse rotation preventing mechanism V shown in FIG. 13B, for example, the contact surface 1100a can be an inclined surface which is inclined in one direction with respect to the axis. In this case, the cross-sectional image of the axis perpendicular cross section XX of the contact surface 1100a is a line segment at two places. Furthermore, for example, as in the reverse rotation preventing mechanism V shown in FIG. 13C, the contact surface 1100a can be a pair of inclined surfaces that are inclined in one direction and the other direction with respect to the axis. In this case, the cross-sectional image of the axis perpendicular cross section XX of the contact surface 1100a is four line segments. In any of these cases, when the contact surface 1100a is viewed in cross section in the direction perpendicular to the axis, there is provided an opportunity for cross sectional images to be obtained at a plurality of locations in the circumferential direction, so the holding posture of the reverse rotation prevention portion 1600 is stable. It can be done.

  Although the case where the first male screw helical structure 1400 and the second male screw helical structure 1500 are formed so as to overlap over the entire axial direction of the male screw portion 32 of the shaft portion 5 has been illustrated here, the present invention is limited thereto Instead, the second external thread spiral structure 1500 can be formed in a superimposed manner on a portion of the first external thread spiral structure 1400, specifically, a portion thereof including the axial end. This is because it is sufficient that the second external thread spiral structure 1500 is present in a range in which the second external thread spiral structure 1150 is screwed with the second internal thread spiral structure 1150 disposed on the end face of the holding unit 10.

  Further, in the present embodiment, when the fastening device 1 and the to-be-fastened member H are fastened, the back facing seat 21 of the second pivoting portion 20 and the member side seat HX of the to-be-fastened member H rotate Since engagement with Z in the circumferential direction is required, it is not necessary to fix the second rotating portion 20 with a torque wrench or the like, and only the first rotating portion 15 needs to be rotated. As a result, the burden on the workers is greatly reduced.

  Furthermore, in the present embodiment, the contour (cross-sectional line G) of the shape of the axis-perpendicular cross-section at an appropriate position on the axis in the back facing seat 21 and the member side seat HX facing each other is along the circumferential directions X and Y. And the area to be displaced. With this shape, once the back facing seat 21 and the member side seat HX abut against each other, relative rotation in the further circumferential direction is restricted, and at the same time, the axial forces of the screw body face each other. 21 and the member side seat HX. That is, the back side engaging portion 60 is buckled outward in the radial direction, and an axial force generated when sandwiching the member to be fastened H is used to make a relative rotation between the back facing seat 21 and the member side seat HX. Can be regulated, so that the tighter it is, the more reliably it is possible to prevent relative rotation.

  Furthermore, by forming the rotary portion-side inclined surface 21a of the back facing seat 21 into a three-dimensional curved surface, it becomes possible to make close contact with the member-side inclined surface HXa. As a result, at the time of fastening in the fastening device 1, it is possible to suppress so-called rattling. In particular, in the case where the to-be-fastened member H is a cylindrical or cylindrical member as in the present embodiment, the shape of the circumferential surface can be effectively utilized as it is.

  Next, a fastening device 1 of a second embodiment is shown with reference to FIGS. 15 and 16. In addition, about the other structure except the reverse rotation prevention mechanism V, since it is the same as or similar to the fastening device 1 of 1st embodiment, here, the reverse rotation prevention mechanism V is mainly demonstrated.

  As shown in FIG. 15, the shaft 5 has a shaft-side unevenness 3500 formed so as to overlap with the spiral structure 1400 of the male screw 32. When viewed from the axial direction, this shaft-portion-side unevenness 3500 is such that a partial arc of a sectioned circular shape formed along the apex of the thread is concave along the chord or inward from the chord The shape is omitted (or cut). The shaft-portion-side unevenness 3500 is formed to extend in the axial direction. In the present embodiment, the valley bottom of the thread remains in the shaft-side unevenness 3500 as well. As a result, also on the shaft-portion-side unevenness 3500, the function of screwing with the holding portion 10 remains. Specifically, in the shaft-portion-side unevenness 3500, it is preferable to omit two thirds of the height of the screw thread as the upper limit, and more preferably, omit it as one half the height of the screw thread as the upper limit. . Therefore, the minimum radius (minimum distance) of the shaft-side unevenness 3500 is larger than the minimum radius (valley radius) from the axial center of the shaft 5. In the present embodiment, the shaft-portion-side unevenness 3500 is formed at a plurality of locations in the circumferential direction.

  As shown in FIG. 16, at the axial direction end of the cylindrical portion 1060 in the sandwiching portion 10, there is formed a reverse rotation preventing portion 1600 whose inner periphery is non-circular in cross section when viewed from the axial direction. The reverse rotation preventing portion 1600 is provided so as to axially protrude in a ring shape in the cylindrical portion 1060, but the shape is not particularly limited, and is formed so as to overlap with the internal thread spiral structure 1140. It is good.

  In the reverse rotation preventing portion 1600, protruding portions 1680 which are convex inward in the radial direction are formed at equal intervals in the circumferential direction at twelve places. As a result, it can be engaged in the circumferential direction with the shaft-portion-side unevenness 3500 formed concave on the outer periphery of the shaft 5. As described above, the projecting portion 1680 is axially thinly provided on the end face of the cylindrical portion 1060 so that it can be elastically deformed radially outward. Therefore, by relatively rotating the shaft portion 5 and the sandwiching portion 10 with a desired force, the projecting portion 1680 is elastically deformed outward, and the circumferential engagement between the projecting portion 1680 and the shaft portion side unevenness 3500 is released. Can. Therefore, if the shaft portion 5 and the sandwiching portion 10 are urged in a direction in which they are tightened with a desired force, relative rotation can be permitted while the projection 1680 and the shaft portion side unevenness 3500 repeat engagement and release. And the clamping unit 10 can be fixed at any place in the middle of screwing. On the other hand, even if the shaft 5 and the sandwiching portion 10 try to relatively rotate in the direction, since the projection 1680 and the shaft-side unevenness 3500 are engaged, they can not be easily loosened. More preferably, by forming at least one of the protrusion 1680 and the shaft-side unevenness 3500 into a saw-tooth shape, rotation in the tightening direction is permitted more smoothly, and rotation in the loosening direction is more firmly regulated. Act as a mechanism.

  Next, the reverse rotation preventing mechanism V of the fastening device 1 according to the third embodiment will be described.

  As shown in FIG. 17, the reverse rotation preventing mechanism V is formed between the back facing seat portion 16 of the first rotating portion 15 and the front end surface 22 of the second rotating portion 20. In the present invention, as long as sliding can be generated by relative rotation of the first pivoting portion 15 and the second pivoting portion 20, the present invention can be formed in other places.

  As shown in FIG. 17A, on the back facing seat portion 16 of the first pivoting portion 15, a first pivoting portion side unevenness 16a is formed. The first rotating portion side unevenness 16 a has a saw blade shape provided in plural in the circumferential direction. The direction in which each of the first rotation unit side irregularities 16a extends, that is, the direction in which the ridge line extends is the radial direction of the relative rotation axis S. As a result, the first rotating portion side unevenness 16 a extends radially from the axial center.

  Furthermore, the back facing seat 16 is a tapered surface that is inclined in the radial direction. The tapered surface is inclined so that the center side protrudes toward the shaft 5 side, and as a result, it has a conical shape convex on the screw tip side. The first rotating portion side unevenness 16 a is formed on this tapered surface.

  As shown in FIGS. 17B and 17C, as the reverse rotation preventing mechanism V, the second rotation portion side unevenness 22a is formed on the front end surface 22 of the second rotation portion 20. The second rotation portion side unevenness 22 a has a saw blade shape provided in a plurality in the circumferential direction. The direction in which each of the second rotation unit side irregularities 22a extends, that is, the direction in which the ridge line extends is along the radial direction of the relative rotation axis S. As a result, the second rotation unit side unevenness 22 a radially extends from the relative rotation axis S.

  Furthermore, preferably, the near side end face 22 is formed with a radially inclined tapered surface. The tapered surface has a conical shape so that the center side approaches the power transmission portion 25. As a result, the tapered surface has a conical shape that is concave toward the screw tip side. The second rotating portion side unevenness 22a described above is formed on this tapered surface.

  As a result, when tightening the first rotation portion 15 and the second rotation portion 20, in the reverse rotation preventing mechanism V, the tapered surface of the first rotation portion 15 in the recess of the tapered surface of the second rotation portion 20. Enters, and the first rotating portion side unevenness 16a and the second rotating portion side unevenness 22a are engaged. As shown in FIG. 18A, when the two sawtooth shapes are rotated in the fastening direction Y, the inclined surfaces come in contact with each other to allow relative slide while narrowing the distance between the two in the axial direction. On the other hand, when attempting to rotate in the loosening direction X, the vertical surfaces (surfaces on the side where the inclination is strong) abut each other to prevent relative movement between the two.

  In particular, as the distance between the first rotation unit 15 and the second rotation unit 20 is reduced by tightening the screwing unit 30, the reverse rotation preventing mechanism V of the present invention reversely rotates the first rotation unit side unevenness 16a and the second rotation The engagement of the part-side unevenness 22a becomes strong, and the engagement strength on the loosening direction X side is enhanced. Here, by making the inclination angle of the conical tapered surface of the first rotating portion 15 and the inclination angle of the conical tapered surface of the second rotating portion 20 different from each other, the respective tapered surfaces are formed. It becomes possible to tighten without rattling regardless of the pitch of the saw teeth. Specifically, the inclination angle of the tapered surface of the second rotating portion 20 from the axial center (the inclination angle of the mortar shape) and the inclination angle of the tapered surface of the first rotating portion 15 from the axial center (a conical shape It is preferable to set the angle smaller than (inclination angle).

  Further, the number of the first rotating portion side unevenness 16a and the number of the second rotating portion side unevenness 22a need not necessarily match, and further, the phase and position in the circumferential direction may be appropriately determined according to the request for mechanical strength. It can be set.

  In addition, although the case where unevenness | corrugation was a saw blade shape was illustrated as reverse rotation prevention mechanism V here, this invention is not limited to this. For example, as shown in FIG. 18 (B), it is also possible to make each other's unevenness into a mountain shape (both are inclined surfaces). In this way, when rotating relative to each other in the loosening direction X, the inclined surfaces try to move relative to each other, but along this inclined surface, the unevenness tends to separate from each other. If this movement distance (the angle of separation α) is set larger than the lead angle of the screwing portion 30, even if the screwing portion 30 tries to be loosened, the unevenness of the screwing portions 30 tends to be further apart, so it can be loosened. It disappears. 18 (B) exemplifies the concavities and convexities having a cross-sectional isosceles triangle, but as shown in FIG. 18 (C), the inclination in the loose rotation makes contact than the inclination angle of the inclined surface in the fastening rotation. It is also preferable to make the surface inclined at a gentle angle. In this way, it is possible to shorten the circumferential distance P of the inclined surfaces which must be overcome each other at the time of fastening rotation, so it is possible to reduce play (gap) after fastening.

  Moreover, as application of FIGS. 18 (A)-(C), as shown to FIG. 18 (D), the wave-shaped unevenness | corrugation which curved the ridge and the valley can also be set. Smooth operability can be obtained at the time of fastening. Furthermore, in the first embodiment, although the concavities and convexities extending in the radial direction are illustrated, as shown in FIG. 19A, it is possible to form a spiral (spiral) groove or peak (concave and convex). Further, as shown in FIG. 19B, even in the case of grooves or ridges (concave and convex) extending linearly, they can be arranged to be inclined so that the circumferential direction phase changes with respect to the radial direction of the screw. Further, as shown in FIG. 19C, a so-called embossed shape in which a plurality of fine irregularities are formed in both the circumferential direction and the radial direction (planar shape) of the screw can be employed.

  Furthermore, as in the present embodiment, it is not necessary to make the concavo-convex shapes coincide (substantially similar or nearly congruent) with each other. For example, different ones of the various shapes in FIGS. 18 and 19 can be selected and combined with each other.

  Although the case where the taper surface of back side seat part 16 is made convex shape and the taper surface of front side end face 22 is made concave here was illustrated here, the present invention is not limited to this, both taper surfaces are plane The tapered surface of the back facing seat portion 16 can be concaved, and the tapered surface of the near side end face 22 can be convexed. Of course, one may be flat and the other may be tapered. Furthermore, by making both of the tapered surfaces in a convex shape or making both of the tapered surfaces in a concave shape, it is possible to make close contact with each other by utilizing the elastic deformation of each other.

  Next, a fastening device 1 of a fourth embodiment is shown using FIG. In addition, about the other structure except the rotation engagement mechanism Z, since it is the same as or similar to the fastening device 1 of 1st embodiment, the rotation engagement mechanism Z is mainly demonstrated here.

  As shown to FIG. 20 (A) thru | or (C), the center is convex along the axial direction of the relative rotation axis S of the back direction seat part 21 of the 2nd rotation part 20. As shown to FIG. Specifically, as shown in FIG. 20 (C), an elliptical hemisphere (or an elliptical cone) whose cross-sectional shape in the direction perpendicular to the relative rotation axis S approximates an ellipse is the center thereof A hole is formed in which the shaft 5 is inserted. Using this shape, the pivoting portion side inclined surface 21 a is formed in the entire area of the back facing seat 21. The pivoting section-side inclined surface 21a has an axial center along the circumferential direction X, Y of the relative rotation axis S, and the contour shape (section line G) of the axis-perpendicular section at an appropriate position on the axis of the relative rotation axis S It includes an area that is displaced to the reference (ie, an area that is not a perfect circle).

  Further, the rotating portion-side inclined surface 21 a is inclined so as to be convex toward the tip end side of the power transmission portion 25. The singular line or singular line U extends along the minor axis and the major axis of the ellipse.

  On the other hand, as shown in FIG. 20 (D), the member side seat HX of the to-be-fastened member H also has a concave shape such as an elliptical hemisphere (or an elliptical cone), and the hole HP is at the center of the bottom surface. Is formed. The member-side inclined surface HPa is formed utilizing the shape of the member-side seat portion HX. In the member-side inclined surface HPa, the contour shape (cross-sectional line G) of the axis-perpendicular section at an appropriate position on the axis of the relative rotation axis S is displaced based on the axial center along the circumferential direction X, Y of the relative rotation axis S Region (that is, a region that is not a perfect circle). Therefore, at the time of fastening of the fastening device 1, the rotating portion side inclined surface 21a and the member side inclined surface HPa abut, and relative rotation of the second rotating portion 20 and the fastened member H is prevented.

  Thus, in the case of the member side seat part HX which dented a part of pipe material, the back facing seat part 21 of the 2nd rotation part 20 is a non-round circle which becomes convex in the to-be-fastened member H side. By making the shape of the bowl shape, it is possible to engage in the rotational direction while bringing the two into close contact with each other. In particular, the axial force of the second rotating portion 20 can be efficiently transmitted to the fastened member H by the mortar-shaped surface contact area.

  In FIG. 21, the rotation engagement mechanism Z of the fastening device 1 of 5th embodiment is shown. As shown to FIG. 21 (A) thru | or (C), the back direction seat part 21 of the 2nd rotation part 20 becomes a single plane inclined with respect to the axial direction of the relative rotation axis S. Using this shape, the pivoting portion side inclined surface 21 a is formed in the back facing seat 21. A part Ga of the contour (section line G) of the cross section perpendicular to the axis of the relative rotation axis S has a distance from the axial center along the circumferential direction of the relative rotation axis S. It includes the area to be displaced.

  On the other hand, as shown in FIG. 21D, the member side seat HX of the to-be-fastened member H is also a single plane inclined with respect to the axial direction of the relative rotation axis S. As a result, in the member-side inclined surface HXa of the member-side seat portion HX, the contour (section line G) of the cross-sectional shape perpendicular to the axis of the relative rotation axis S is displaced along the circumferential direction from the axis Including the area. Therefore, when the fastening device 1 is tightened, the rotating portion-side inclined surface 21a and the member-side inclined surface HXa abut, and relative rotation of the second rotating portion 20 and the fastened member H is prevented.

  As described above, when the member side seat portion HX is a flat surface inclined with respect to the axial direction, by forming the back facing seat portion 21 parallel to the member side seat portion HX, both are brought into close contact with each other. The rotational engagement mechanism Z can be engaged in the rotational direction.

  In the third embodiment, although the case where the rotating portion side inclined surface 21a and the member side inclined surface HXa are a single plane is illustrated, it may be configured by a plurality of planes having different inclination angles. . For example, it is possible to combine two wedge-shaped inclined surfaces that form a V-shaped side surface, or to form a polygonal wedge having three or more inclined surfaces. In addition, the rotating portion side inclined surface 21a and the member side inclined surface HXa may be configured by combining a flat surface and a curved surface.

  FIG. 22 shows a pivoting engagement mechanism Z of the fastening device 1 according to the sixth embodiment. The outer wall (peripheral wall) of the back facing seat 21 of the second rotation unit 20 has a partial arc shape concentric with the axis of the relative rotation axis S, and the remaining portion is cut off linearly like a chord By making it shape, this string is made into the rotation part side contact part 21b. That is, the rotating portion side contact portion 21 b is configured by a plane that is orthogonal to the radial direction and directed radially outward around the back facing seat 21.

  On the other hand, the member-side seat portion HX has a member-side contact portion HXb which is a plane perpendicular to the radial direction and directed inward in the radial direction around the relative rotation axis S. Therefore, the rotating portion side contact portion 21b and the member side contact portion HXb face each other and contact each other.

  In more detail, the pivoting part side contact part 21b is a first pivoting part side contact area 21bx that faces in one rotational direction X of the relative rotational axis S, and a second pivoting that faces in the other rotational direction Y A part side contact area 21 by is provided. The member-side contact portion HXb includes a first member-side contact region HXby facing in the rotation direction Y of the relative rotation axis S and a second member-side contact region HXbx facing in the rotation direction X.

  For example, when the second rotating portion 20 tries to rotate relative to the to-be-fastened member H in the Y direction, the first rotating portion side contact area 21bx and the first member side contact area HXby come into contact with each other. Relative rotation is suppressed. Similarly, when the second rotation portion 20 tries to rotate relative to the fastened member H in the X direction, the second rotation portion side contact area 21by and the second member side contact area HXbx abut, The relative rotation is suppressed. In addition, although the case where the to-be-fastened member H integrally provides the member side contact part HXb was illustrated here, the to-be-fastened member H and the member side contact part HXb may be another members. That is, the member-side contact portion HXb may be an external member located around the second rotation portion 20.

  In addition, the rotation part side contact part 21b and the member side contact part HXb are arrange | positioned in the one part angle range of the circumferential direction. If it is attempted to form the entire circumference, the structure becomes complicated and the manufacturing cost increases, and furthermore, the operation of fitting in each other becomes complicated. Therefore, as an angle range which comprises a contact part, less than 180 degrees is preferable, More preferably, it is less than 120 degrees. In this embodiment, they are disposed within an angle range of about 70 °. As a result, the remaining range of 290 ° can open the periphery of the second rotation unit 20.

  Furthermore, in the present embodiment, the thickness portion as the member of the second rotation portion 20 is effectively used to form the rotation portion side contact portion 21 b on the side surface. Therefore, the manufacturing cost can be reduced. Further, the member-side contact portion HXb can be formed on the step by effectively using the step in the fastened member H (for example, the step between the base plate h10 and the column member h20 in the bracket H2).

  In the fourth embodiment, the shapes of the rotating portion side contact portion 21b and the member side contact portion HXb can be variously applied, and they can be any non-circular shape centered on the relative rotation axis S. It is possible to engage the rotating portion side contact portion 21b and the member side contact portion HXb in the circumferential direction. For example, the rotating portion side contact portion 21 b can be formed at a plurality of locations around the back facing seat 21. At this time, the member-side contact portion HXb formed around the member-side seat portion HX may be formed at a plurality of places.

  Furthermore, for example, as shown in FIGS. 23A and 23B, the outer wall around the back facing seat 21 of the second rotation unit 20 has a partial arc shape concentric with the axis of the relative rotation axis S. The radially extending projection T can be formed only in a part of the area. The protrusion T is the rotating portion side contact portion 21b, and in the protrusion T, one side surface facing in one rotational direction X is the first rotating portion side contact region 21bx, and the other side surface facing in the rotational direction Y Is the second rotation unit side contact area 21by. At this time, a pair of columnar (in this case, cylindrical) projecting portions K1 and K2 are formed around the member side seat HX so as to sandwich the projection T. The protrusions K1 and K2 become the member-side contact portion HXb. Although not shown in particular, the protrusions K1 and K2 and the like may be detachably attached to the fastened member H by a screw structure or the like. Of course, it is good also considering the step part which the to-be-fastened member H has beforehand as the member side contact part HXb.

  Further, although not shown here, a pair of projecting portions K1 and K2 may be formed on the second rotating portion 20 side, and a protrusion T extending in the radial direction may be formed on the to-be-fastened member H side. If the protrusions T on the side of the to-be-fastened member H are sandwiched by the protrusions K1 and K2 of the second rotating portion 20, relative rotation between the both can be suppressed.

  FIG. 24 shows the pivoting engagement mechanism Z of the fastening device 1 of the seventh embodiment. As shown in FIGS. 24 (B) and (C), a rotating portion side step 21 c is formed around the back facing seat 21 of the second rotating portion 20. The pivoting portion side step portion 21c is formed by an inner wall of a protrusion which is bent (projected) toward the to-be-fastened member H with reference to the back facing seat portion 21.

  On the other hand, the member-side seat portion HX of the fastened member H has a member-side stepped portion HXc extending in the axial direction of the relative rotation axis S. The member side step portion HXc has a level difference which falls to the screw tip side. The distances from the axial center of the relative rotation axis S of the rotating portion side step 21c and the member side step HXc are equal to each other. Therefore, the rotary portion side step portion 21c and the member side step portion HXc are brought into contact with each other in the circumferential direction to prevent relative rotation.

  Thus, the second rotation engagement mechanism Z is a part of the range in the circumferential direction of the relative rotation axis S, and the second rotation part side step 21c is formed to protrude toward the screw tip side. It is possible to open the entire periphery of the rotation unit 20.

  FIG. 25 shows the pivoting engagement mechanism Z of the fastening device 1 of the eighth embodiment. As shown in FIGS. 25A and 25B, on the inner side than the outer edge of the back facing seat 21 of the second rotating portion 20, a rotating portion side step (protrusion) 21c is formed. The turning portion side step portion 21 c is bent (projected) toward the to-be-fastened member H with reference to the back facing seat portion 21.

  On the other hand, as shown in FIG. 25C, a member side step (recess) HXc that accommodates the rotating portion side step 21c is formed inside the outer edge of the member side seat HX of the fastened member H. Ru. As a result, the rotating portion side step portion (protrusion) 21c and the member side step portion (dent) HXc are engaged to prevent relative rotation.

  In FIG. 26, the rotation engagement mechanism Z of the fastening device 1 of 7th embodiment is shown. As shown in FIGS. 26 (A) and 26 (B), the peripheral wall of the back facing seat 21 of the second rotation unit 20 has a regular circular shape that is eccentric with respect to the axis (the center of the hole) of the relative rotation axis S. It has become. The peripheral wall is the rotating portion side contact portion 21b.

  On the other hand, the member side seat HX of the member to be fastened H is a receiving recess for receiving the back facing seat 21 of the second rotating part 20, and the inner wall of the receiving recess also has a relative rotational axis. It has a regular circle shape eccentric to the axis of S. This inner wall is the member-side contact portion HXb. In addition, the eccentric amount of the rotation part side contact part 21b and the member side contact part HXb is the same.

  Therefore, as the power transmission portion 25 is inserted into the hole HP of the fastened member H, the back facing seat 21 of the second rotating portion 20 is placed in the housing recess (member side seat HX) of the fastened member H. When accommodated, the rotating portion side contact portion 21b and the member side contact portion HXb are engaged in the circumferential direction centering on the relative rotation axis S, and the relative rotation of the both in the circumferential direction is restricted. That is, the rotating portion side contact portion 21b and the member side contact portion HXb function as the rotating engagement mechanism Z. In particular, here, since the rotating portion side contact portion 21b and the member side contact portion HXb are formed in a true circle, the relative rotation between the two while the shape processing of the second rotating portion 20 and the housing recess is extremely simplified. Can be prevented.

  As shown in FIGS. 27 (A) to 27 (C), the peripheral wall of the back facing seat 21 of the second rotation unit 20 and the inner wall of the housing recess forming the member side seat HX are relatively rotated. With the partial arc shape concentric to the axis of the axis S and the remaining portion cut into a straight line like a chord, these chords are in contact with the pivoting portion side abutment portion 21b and the member side It can also be part HXb. Since the distance from the axial center of the relative rotation axis S changes along the circumferential direction, the rotating portion side contacting portion 21b and the member side contacting portion HXb are engaged in the circumferential direction and the relative rotation is restricted. Be done.

  Next, another configuration example of the so-called one-side bolt to which the reverse rotation preventing mechanism V and / or the pivoting engagement mechanism Z of the first to ninth embodiments can be applied will be described. In addition, in the drawings, the explanation of the reverse rotation preventing mechanism V and the rotational engagement mechanism Z may be omitted by attaching reference signs V and Z to portions where there is a possibility of being applied.

  FIG. 28 shows a fastening device 1 according to the first configuration example. The fastening device 1 includes a shaft 5 extending in the axial direction, a holding unit 10 disposed on the back side of the shaft 5 in the axial direction, and a first rotating unit 15 disposed on the front side of the shaft 5 in the axial direction. A second rotation unit 20 disposed on the front side and rotating relative to the first rotation unit 15, and a power transmission unit disposed closer to the sandwiching unit 10 than the second rotation unit 20 to transmit an axial force And a back side engaging portion 60 axially held between the power transmission portion 25 and the holding portion 10. In addition, although the case where these components or members are comprised with a metal is illustrated in this 1st embodiment, you may comprise with members other than a metal, and you may comprise combining different materials.

  The first pivoting portion 15 engages with a tightening and loosening tool (not shown) to receive pivoting power. There are various ways to engage with the tightening and loosening tool. For example, in order to engage with the spanner, the outer shape of the first rotating portion 15 is a hexagon, or a polygon including a convex and a concave. It may be a multi-faceted shape, and in order to engage with a clamping tool such as a hexagonal wrench, a hole having a shape corresponding to the clamping tool such as a hexagonal hole or a hexagonal wrench may be formed on the end face of the first rotating portion 15 Just do it.

  The second pivoting portion 20 has a pivoting engagement mechanism Z in the back facing seat 21 and engages in a circumferential direction with a not-shown fastening member.

  The first pivoting portion 15 and the second pivoting portion 20 rotate relative to each other and engage in the axial direction. In the present embodiment, the front end face 22 of the second rotating portion 20 and the back facing seat 16 of the first rotating portion 15 axially engage.

  Here, the first pivoting portion 15 is integrally provided at the front end of the shaft portion 5 here. Therefore, the first rotation unit 15 and the shaft unit 5 rotate together.

  The shaft 5 is a cylindrical member (not necessarily in the form of a column, as long as it has a columnar shape), and acts on the holding portion 10, the screwing portion 30, the first rotation portion 15 and the like. Transmit the axial force. In the present embodiment, the shaft portion 5 transmits an axial force between the holding portion 10 and a screwing portion 30 (details will be described later) formed in the self. The shaft portion 5 is set to be longer than the thickness of the fastened member H.

  The holding unit 10 is integrally and coaxially provided at the rear end of the shaft 5.

  The holding portion 10 is a member having an outer shape larger than the diameter of the shaft portion 5, that is, a member protruding outward in the radial direction with respect to the shaft portion 5. Specifically, in the present embodiment, the outer shape of the holding portion 10 is a cylinder, a cylinder or a cone.

  The holding portion 10 protrudes outward in the radial direction with respect to the shaft portion 5 to form a receiving portion 11 facing the front side. Here, although the receiving part 11 is comprised by the plane which becomes orthogonal to an axial direction, a conical taper surface may be sufficient.

  A screwing portion 30 is formed between the shaft portion 5 and the holding portion 10. Specifically, the screwing portion 30 includes a female screw portion 31 formed on the inner periphery of the sandwiching portion 10, and a male screw portion 32 formed on the outer periphery of at least the back side of the shaft portion 5 and screwing with the female screw portion 31. It comprises and is constituted. Therefore, the holding part 10 becomes a cylindrical internal thread body, and the axial part 5 becomes an external thread body.

  The second pivoting portion 20 has a back facing seat 21 facing the back side (the back side engaging portion 60 side). The back facing seat portion 21 axially engages with the front end surface 27 of the transmission portion 25 and abuts against the front side surface of the member H to be fastened. The back facing seat portion 21 may abut on a washer (not shown) in particular, and may be engaged with the power transmitting portion 25 and the to-be-fastened member H in the axial direction via the washer.

  An interlocking mechanism 90 is formed between the clamping unit 10 and the transmission unit 25 to rotate the clamping unit 10 and the transmission unit 25 in parallel and to move the clamping unit 10 and the transmission unit 25 in the axial direction. . The interlocking mechanism 90 is provided in the clamping unit 10, and includes an interlocking sleeve 92 axially extending inward of the back side engaging portion 60, and a sleeve accommodation hole 94 provided in the power transmission portion 25 for accommodating the interlocking sleeve 92. Have. As shown in FIG. 28C, on the outer peripheral surface of the interlocking sleeve 92 and the inner peripheral surface of the sleeve accommodation hole 94, grooves or row-like protrusions extending in the axial direction and engaged with each other in the circumferential direction One or more series are preferably formed. Accordingly, the interlocking sleeve 92 and the sleeve receiving hole 94 are axially slidable and circumferentially engaged. Although not illustrated here, it is also possible to form a sleeve accommodation hole 94 in the back side engagement portion 60 and to form an interlocking sleeve 92 in the power transmission portion 25.

  The second rotation unit 20 rotates together with the power transmission unit 25 by being integrated. Therefore, when the second rotation unit 20 is rotated, the holding unit 10 rotates together via the power transmission unit 25 and the interlocking mechanism 90.

  When the first and second rotating parts 15 and 20 rotate relative to each other, the relative rotation is converted by the screwing part 30 into relative movement of the holding part 10 and the transmission part 25 in the axial direction.

  The power transmission portion 25 is a substantially cylindrical sleeve member here, and the shaft portion 5 is inserted therein. The length of the power transmission portion 25 is set equal to or greater than the thickness of the fastened member H, and set shorter than the shaft portion 5. The power transmission unit 25 is disposed between the second rotation unit 20 and the rear engagement unit 60, and transmits an axial force like a so-called stick. Although the case where the 2nd rotation part 20 and the transmission part 25 are integral is illustrated here, both may be separate bodies.

  The maximum outer diameter of the power transmission portion 25, the maximum outer diameter of the holding portion 10, and the maximum outer diameter of the back side engaging portion 60 before the diameter expansion are set to be equal or approximate. This is because it is necessary to insert all of these into the hole HP of the fastened member H from the near side.

  The power transmission portion 25 adopts a shrinking structure whose length can be shrunk inside the hole HP of the fastened member H. For example, a cylindrical first power transmission piece 28A located on the back side and a cylindrical second power transmission piece 28B located on the front side are provided as the light collection and contraction structure, and this first power transmission piece 28A and The second power transmission piece 28B is engaged in the circumferential direction while sliding in the axial direction. At this time, the inner diameter of the second transmission piece 28B is set larger than the outer diameter of the first transmission piece 28A, and the second transmission piece 28B enters the outside of the first transmission piece 28A. The entire length of the force portion 25 is contracted. As shown in FIG. 28 (D), between the outer periphery of the first transmission piece 28A and the inner periphery of the second transmission piece 28B, grooves or rows of projections extending in the axial direction and engaged with each other in the circumferential direction are formed. By forming a plurality in the circumferential direction, the rotation of the second rotation unit 20 can be transmitted to the sandwiching unit 10.

  The shear portion (shear washer) 29 is fixed to the outer periphery of the first transmission piece 28A, and the rear end portion of the second transmission piece 28B abuts on the shear portion 29 in a state where the transmission portion 25 is the longest. Contact. As shown in FIG. 28 (B), after the pinching portion 10 is moved to the front side to enlarge the diameter of the back side engaging portion 60, an external force is further applied to shrink the transmission portion 25 in the axial direction. Then, as shown in FIG. 2, the sheared portion 29 is sheared, and the second transmission piece 28B enters the outside of the first transmission piece 28A, so that the total length of the transmission portion 25 is shortened. In particular, in the present case, the first power transmission piece 28A and the second power transmission piece 28B are both set to an outer diameter smaller than the hole HP of the fastened member H, and both are inserted into the hole HP. In addition, the outer diameter of the sheared portion 29 is also set smaller than the hole HP (or set equal to or less than the maximum outer diameter of the power transmitting portion 25), and is arranged near the axial center of the power transmitting portion 25 Sometimes it is located in the hole HP.

  The axial force when the shearing portion 29 shears is set to be larger than the axial force required when the rear engagement portion 60 expands in diameter. That is, until the rear engagement portion 60 is expanded in diameter, the power transmission portion 25 is not contracted in the axial direction so that only the holding portion 10 slides in the axial direction, and the axial force larger than that When the axial force (at the time of fastening) is applied, the sheared portion 29 is positively fractured and the power transmitting portion 25 is contracted.

  The back side engaging portion 60 is a deformation sleeve here, and is easily buckled outward in the radial direction, so that the hand-front seat 64 is expressed using the side surface of the deformation sleeve after deformation. Let

  As a result, the fastening device 1 can be fastened to the to-be-fastened member H using the forward facing seat portion 64 of the sandwiching portion 10 and the back facing seat portion 21 of the second rotating portion 20. Although the case where the front facing seat portion 64 and the back facing seat portion 21 are in direct contact with the to-be-fastened member H for fastening is illustrated, in the present invention, a washer or the like intervenes for indirect fastening. Including the case.

  The back side engaging portion 60 will be described in more detail.

  As shown in FIG. 28 (A), the back side engaging portion 60 is an annular member, and the contact surface 63 facing the axial direction front side and the axial direction back side facing the contact surface 63 face each other. It has a back side engagement surface 66 that abuts on the receiving portion 11.

  The back side engaging portion 60 has an easily deformable region 620 where deformation is easy with respect to an external force, and a difficultly deformable region 640 which is less likely to be deformed than the easily deformable region 640 with respect to an external force. The easily deformable region 620 and the difficultly deformed region 640 are made of materials having different physical properties. For example, in the present embodiment, the easily deformable region 620 is a metal green material, and at least a part (sometimes all) of the difficultly deformable region 640 is a hardened steel. In addition, although the case where physical properties differ mutually according to the quenching state of a metal material is illustrated here, this invention is not limited to this. For example, the easily deformable region 620 may be made of carbon steel for machine structure (for example, S45C), and the less deformable region 640 may be made of chromium-molybdenum steel, and they may be integrated by joining them together. Alternatively, the easily deformable region 620 may be a resin material or a rubber material, and the difficultly deformable region 640 may be a metal material, and both may be integrally molded.

  Both the easily deformable region 620 and the difficultly deformable region 640 are ring-shaped regions, and these are continuous in the axial direction. Specifically, the hard-to-deform regions 640, 640 are arranged on the axially outer side of the easily-deformable region 620, respectively.

  As a result, as shown in FIG. 28B, when the sandwiching portion 10 and the power transmission portion 25 approach, the axially center-side easily deformable region 620 preferentially buckles and radially outwardly expands, The hard deformation region 640 is inclined radially outward. As a result, the side surface of the intractable deformation region 640 becomes the front facing seat portion 64 and abuts on the back end surface 26 on the back side in the axial direction of the power transmission portion 25 and the to-be-fastened member H.

  According to the fastening device 1 of the first configuration example, since the back side engaging portion 60 has the easily deformable region 620, the back side engaging portion 60 can be easily deformed (or buckled) Become. On the other hand, since the back side engaging portion 60 has the difficultly deformed area 640, it is possible to enhance the strength or rigidity of the back side engaging portion 60 after deformation. As a result, it is possible to simultaneously reduce the burden on the operator at the time of fastening and to increase the fastening force.

  Further, according to the fastening device 1 of the first configuration example, the distance (contraction distance) M in which the first power transmission piece 28A and the second power transmission piece 28B slide is one fourth of the total length of the power transmission portion 25. The above, preferably one third or more can be achieved. As a result, in the single fastening device 1, it is possible to flexibly cope with thickness variations of the fastened member H. Specifically, the fluctuation allowable amount Ex of the thickness E of the member to be fastened can be 0.2 L or more, preferably 0.3 L or more, more preferably, with respect to the entire length L of the fastening device 1 in the axial direction. Can be 0.4 L or more. Moreover, the maximum value which thickness E in this case can select can be 0.7 L or more, More preferably, it can be 0.8 L or more. In other words, it is possible to flexibly cope with the thickness variation of the fastened member H while making the entire length of the fastening device 1 compact.

  Furthermore, according to the fastening device 1 of the first configuration example, when the first turning portion 15 and the second turning portion 20 are relatively rotated in the diameter-reduced state of FIGS. 28 (A) and (B), the first time The shaft 5 rotates with the moving unit 15, and the holding unit 10 rotates with the second rotating unit 20. As a result, as shown in FIGS. 28C and 28D, the holding portion 10 is moved to the front side by the screwing portion 30 between the shaft portion 5 and the holding portion 10, and the back side engaging portion 60 is obtained. The diameter can be expanded. Therefore, even after fastening, the shaft portion 5 does not protrude to the front side, so it does not get in the way.

  In the first configuration example, the easily deformable region 620 is disposed only at the center of the back side engaging portion 60, but the present invention is not limited to this. For example, as shown in FIG. 30A, in the back side engaging portion 60, it is also preferable that a plurality of easily deformable regions 620 and a plurality of difficultly deformable regions 640 be alternately arranged along the axial direction. In this way, as shown in FIG. 30B, it is possible to buckle only a specific place of the back side engaging portion 60 and to easily expand radially outward.

  Furthermore, although the case where the shapes of the easily deformable region 620 and the hard-to-deform region 640 are the same (in particular, the cross-sectional shape in the direction perpendicular to the axis is the same) is illustrated in the above embodiment, the present invention is not limited thereto. For example, as shown in FIG. 30C, it is possible to make the shapes of the axially continuous easily deformable region 620 and the difficultly deformed region 640 different from each other. As a result, even with materials having the same physical properties, the mechanical characteristics of the easily deformable region 620 and the difficultly deformable region 640 are made different.

  In FIG. 30A, an annular slit having a depth in the radial direction is provided on the inner peripheral surface or the outer peripheral surface of the cylindrical member, and the easily deformable region 620A that is vulnerable to external force is obtained by this slit. 620B, 620C are formed.

  Here, in the central portion to be buckled so as to project radially outward, a slit is formed on the outer peripheral surface side to form the easily deformable region 620A on the inner peripheral surface side, and the difficultly deformable region 640 is formed from this easily deformable region 620A. A slit is formed on the inner peripheral surface side on both outer sides separated in the axial direction via the easy-deformation areas 620B and 620C on the outer peripheral surface side. As a result, when the back side engaging portion 60 is pinched in the axial direction by the holding portion 10 and the transmission portion 25, as shown in FIG. 17B, the easily deformable regions 620A, 620B, 620C can be bent to tilt the hard-to-deform region 640.

  On the other hand, as shown in FIG. 31A, in the central portion to be buckled so as to protrude radially outward, a wide slit is formed on the inner peripheral surface side, and an easily deformable region 620A is formed on the outer peripheral surface side. On both outer sides axially separated from the easily deformable region 620A via the hard-to-deform region 640, wide slits are formed on the outer peripheral surface side and easily deformable regions 620B and 620C are formed on the inner peripheral surface side. good. As a result, when the back side engaging portion 60 is pinched in the axial direction by the holding portion 10 and the transmission portion 25, as shown in FIG. 30B, wide slits are closed to easily deform the regions 620A, 620B. , 620C can be bent to tilt the hard-to-deform region 640. That is, in these cases, the mechanical strength is made to differ by making the easily deformable region 620 thin and making the hard deformation region 640 thick.

  Although the above-mentioned embodiment illustrated the case where the easy deformation area 620 and the hard deformation area 640 are continuous in the axial direction, the present invention is not limited to this, and can be continuous in the circumferential direction. The case will be described in detail below.

  In the back side engaging portion 60 shown in FIG. 32, the back side engaging surface 66 is a tapered surface which is inclined with respect to the direction perpendicular to the axis. Accordingly, the axial force is converted into an expansion force directed radially outward by the receiving portion 11 and the back side engaging surface 66, which are also tapered surfaces, being pressed in the axial direction.

  The hand front seat portion 64 abuts on the back end surface 26 on the back side in the axial direction of the power transmission portion 25 in advance. The hand front seat 64 moves radially outward while sliding relative to the back end face 26.

  As a result of the above, when the back side engagement surface 66 slides radially outward with respect to the receiving portion 11, the forward facing seat portion 64 slides radially outward with respect to the back side end surface 26 in conjunction with it. When both the back side engagement surface 66 and the front facing seat portion 64 move radially outward, they project radially outward relative to the holding portion 10 and the power transmission portion 25. Since the back side engaging portion 60 is not inclined at the time of diameter expansion, parallel displacement can be performed radially outward without changing the axial dimension.

  As shown in FIG. 32 (A), a plurality of (three in this case) back side engaging portions 60 are arranged in the circumferential direction, and each back side has a front facing seat portion 64 and a back side engaging surface 66. It has an engagement piece 62 and a projection restricting portion 70 which defines a movement limit when the hand-front seat 64 moves radially outward.

  The back side engagement piece 62 is thick and has high rigidity, and corresponds to a difficultly deformed area 640. On the other hand, the protrusion restricting portion 70 is thin and easily deformable, and corresponds to the easily deformable region 620.

  The back side engaging piece 62 is a member having a partial arc shape in a plan view, and by being disposed in plural in the circumferential direction, it has a substantially cylindrical shape except for the location of the connecting ring 72.

  The protrusion restricting portion 70 serves as a ring connection portion 72 that links the plurality of back side engagement pieces 62 in the circumferential direction. The connecting ring portion 72 is an easily deformable member, and the dimension in the connecting ring direction, that is, the dimension (distance) in the circumferential direction is variable. Moreover, the upper limit is set to the circumferential direction dimension of the connection ring part 72, and when it reaches an upper limit, it has a structure where a distance does not expand beyond it.

  Specifically, in the state where the back side engaging portion 60 in FIG. 32A is reduced in diameter, the ring portion 72 is a thin-walled member that is folded in the circumferential direction by bending so as to reciprocate in the radial direction. . Further, the ring connection portion 72 mutually connects the outer periphery side vicinity of the back side engagement portion 60 to each other, and is bent inward in the radial direction. Therefore, as shown in FIG. 32C, when the ring portion 72 is elastically or plastically deformed in the circumferential direction until it reaches its upper limit, the distance of the back side engaging piece 62 adjacent in the circumferential direction is increased, The side engagement piece 62 translates radially outward while maintaining the axial direction. When the ring portion 72 is completely extended, the movement of the back side engagement piece 62 is stopped.

  As shown in FIG. 32D, when the first and second pivoting parts 15 and 20 are relatively rotated to fasten the fastened member H, the reaction force of the back side engaging piece 62 is the forward facing seat of the engagement piece 62. It is transmitted to the receiving part 11 of the holding part 10 via the part 64. As a result, although each of the back side engagement pieces 62 tries to move further radially outward, the tension of the link portion 72 restricts the further movement, and it is possible to receive the reaction force.

  Thereafter, as shown in FIG. 33, the sheared portion 29 is sheared, and the second transmission piece 28B enters the outside of the first transmission piece 28A to shorten the total length of the transmission portion 25 and engage the back side. The to-be-fastened member H is fastened by the part 60 and a 2nd rotation part.

  In this example, the ring portion 72 which becomes the easily deformable region 620 and the back side engaging piece 62 which becomes the difficultly deformable region 640 continue alternately in the circumferential direction. Therefore, even if the back side engaging piece 62 serving as the washer after the diameter expansion is made thick, the connecting ring portion 72 can be easily deformed, so that the burden on the operator when fastening is reduced.

  In addition, if the connecting ring portion 72 is an elastic member that can be restored after deformation, it becomes possible to return to the diameter-reduced state by separating the holding portion 10 and the power transmission portion 55 after fastening. It can be easily removed from the object H.

  In this configuration example, although the case where the annular ring portion 72 which is thin in plan view is bent in the radial direction is illustrated, the annular ring portion which is thin in the radial direction is bent in the axial direction and folded in the circumferential direction You can also.

  Further, the back side engaging piece 62 can be made thick in the radial direction and in the axial direction. Further, since the forward facing seat portion 64 of the back side engaging piece 62 can be moved radially outward as it is, and the forward facing seat portion 64 can receive the reaction force of the fastened member H, rigidity is enhanced. It is possible to increase the fastening force.

  In particular, in the back side engaging portion 60 of the present embodiment, by exclusively arranging the connecting ring portion 72 which is deformed at the time of diameter expansion, the side of the back side engaging piece 62 is not elastically or plastically deformed. Thick design is possible. Since the connecting ring portion 72 can be easily deformed, the burden on the operator when connecting is reduced.

  Although the back side engaging part 60 of the said structural example illustrated the case where the back side engaging piece 62 and the protrusion control part 70 (ring ring part 72) were integrally formed, this invention is not limited to this, For example, As shown in FIG. 34, it is also possible to combine separate members. In this case, the back side engagement piece 62 may use a metal material whose surface hardness has been increased by quenching or the like, and the link portion 72 may use a normal metal material or a metal material that is easily elastically deformed. Of course, resin materials other than metal may be combined.

  The back side engaging portion 60 in the above configuration example exemplifies a case in which three back side engaging pieces 62 are arranged, but the number is not particularly limited. For example, as shown in FIG. You may arrange above. It may be two. Further, although the case in which the ring connection portion 72 of the back side engagement portion 60 in the above configuration example mutually connects the outer peripheral side vicinity of the back side engagement portion 60 to each other, as shown in FIG. It is also preferable to mutually connect the inner peripheral side vicinity of the side engaging part 60, and to make it bend toward the radial direction outer side. In this way, it is possible to increase the moving distance of the back side engagement piece 62 outward in the radial direction due to the extension of the ring portion 72.

  The back side engaging portion 60 in the above configuration example is configured such that the hand front seat portion 64 and the back side engaging surface 66 of the back side engaging piece 62 do not exist at the location where the ring portion 72 exists. However, the present invention is not limited to this. For example, as shown in FIG. 36, in the rear engagement piece 62, the vicinity of the hand front seat portion 64 and / or the rear engagement surface 66 can also be expanded in the circumferential direction. That is, the ring portion 72 and the front facing portion 64 and / or the rear engagement surface 66 may be arranged to overlap in the axial direction. This makes it possible to increase the area of the hand-front seat 64 and / or the back engagement surface 66.

  The fastening device 1 of the above configuration example has a structure that receives the reaction force of the member to be fastened H by the tapered surfaces of the receiving portion 11 and the back side engaging surface 66 in the diameter-expanded state of FIG. 32 (C) and (D). Although illustrated, the present invention is not limited thereto. For example, as shown in FIG. 37, the receiving portion 11 is a first receiving portion 11a which is a tapered surface on the inner peripheral side, and a second surface which is disposed on the outer peripheral side of the first receiving portion 11a It has a two-stage structure including the receiving portion 11b. Further, the back side engaging surface 66 is a first back side engaging surface 66a which is a tapered surface on the outer peripheral side, and a plane which is disposed on the inner peripheral side of the first back side engaging surface 66a and extends in a direction perpendicular to the axis. And a second back engagement surface 66b. In this case, at the time of diameter reduction in FIG. 37A, the first receiving portion 11a and the first back side engagement surface 66a abut, and the axial structure is converted into the expansion force by the taper structure to perform the back side engagement The diameter of the portion 60 is enlarged. At the end of the diameter expansion, as shown in FIG. 37 (B), the contact between the first receiving portion 11a and the first back side engagement surface 66a is released, and the second receiving portion 11b and the second back side engagement The surface 66b abuts to complete the outward radial movement of the back engagement piece 62. Therefore, the second receiving portion 11b and the second back side engaging surface 66b can also be defined as a part of the protrusion restricting portion 70 in the present invention.

  In addition, the second receiving portion 11b and the second rear engagement surface 66b can receive the axial reaction force from the fastened member H in a plane that is vertical. At the same time, since the tension acting on the annular portion 72 can be reduced or released in the expanded diameter state, fatigue of the annular portion 72 can be suppressed. In addition, although the case where the receiving part 11 and the back side engagement surface 66 were made into 2 step structure was illustrated here, for example, when making the back side end surface 26 and the hand front seat part 64 into a taper structure, this is 2 steps It is also possible to make it a structure.

  Furthermore, as shown in FIG. 38, in the receiving portion 11 and the rear side engaging surface 66, steps 11c and 66c can be formed which engage with each other in the radial direction when the diameter expansion operation is completed (during the diameter expansion state). . Similarly, in the rear end surface 26 and the front facing seat portion 64, stepped portions 26c, 64c can be formed which engage with each other in the radial direction when the diameter increasing operation is completed. Since these steps can restrict the radial outward movement of the back side engagement piece 62, these steps can also be defined as a part of the protrusion restricting portion 70 in the present invention. .

  In the above configuration example, the hand-front seat portion 64 and the back end surface 26 are configured by planes parallel to the direction perpendicular to the axis, but the present invention is not limited to this. For example, as shown in FIG. 39, it is also preferable to convert the pressing force in the axial direction into an expansion force for moving the forward facing seat 64 radially outward with the forward facing seat 64 and the back end face 26 as tapered surfaces. .

  Although the above configuration example exemplifies the case where the front facing seat portion 64 and a part of the back side end face 26 abut each other in the diameter-expanded state of FIGS. 32C and 32D, the present invention is not limited thereto. . For example, as shown in FIG. 40 (B), in the diameter-expanded state, the contact between the front facing seat portion 64 and the rear end surface 26 is released, and the rear end surface 26 of the power transmission portion 25 It is also preferable to make it approach the inner peripheral side of the joint portion 60. In this way, the fastening amount (tightening amount) by the back side engaging portion 60 and the second rotation portion 20 can be increased by the distance T by which the power transmission portion 25 can enter into the back side engaging portion 60. Thus, it is possible to flexibly cope with the thickness change of the fastened member H.

  In the above configuration example, the screwing portion 30 is disposed between the shaft portion 5 and the holding portion 10, and the holding portion 10 is moved to the front side to enlarge the diameter of the back side engaging portion 60. However, the present invention is not limited to this.

  For example, as shown in FIG. 41 (A), the male screw 32 is disposed on the front side of the shaft 5 to form a female screw, and the second rotary 20 is a nut to arrange the female screw 31 on the inner peripheral surface. The screwing portion 30 can be configured by screwing the male screw portion 32 and the female screw portion 31.

  In this case, by forming the first rotation unit 15, the shaft unit 5, and the holding unit 30 integrally, the second rotation unit 20 and the first rotation unit 15 are rotated relative to each other. The power transmission portion 25 can be made to approach in the axial direction, and the diameter of the back side engagement portion 60 can be expanded (see FIG. 41 (B)). In addition, although the 2nd rotation part 20 and the transmission part 25 are separately comprised here, you may integrate.

  The power transmission unit 25 does not necessarily have to be contracted in the axial direction (see FIG. 43 for that case), but as shown in FIG. When the portion 20 and the first rotation portion 15 are relatively rotated to move the sandwiching portion 30 to the front side, the shearing portion 29 of the power transmission portion 25 is sheared, and the second power transmission portion 28A is The transmission piece 28B can enter and the total length of the transmission portion 25 can be shortened. In this way, it is possible to flexibly cope with the thickness variation of the fastened member H.

  Further, as shown in FIG. 42, the diameter of the second power transmission piece 28B disposed on the front side is set larger than the hole HP, and the second power transmission piece 28B is disposed on the front side of the fastened member H. It may also function as a seat (a washer) of the second rotation unit 20. In this case, the entire length of the transmission portion 25 is reduced by advancing the front end of the first transmission piece 28A to the inner peripheral side of the second transmission piece 28B (FIG. 42 (B)). reference).

  In both FIG. 41 and FIG. 42, the axial force when the shearing portion 29 shears is set larger than the axial force required when the back side engaging portion 60 expands. That is, the power transmission portion 25 is not contracted in the axial direction until the diameter of the back side engagement portion 60 is expanded, and when a larger axial force (ie, an axial force at the time of fastening) acts, the shear portion 29 Active breakage is caused, and the power transmission unit 25 contracts.

  For example, as shown in FIG. 43 (A), as the back side engaging portion 60, the back side engaging piece 62 (hardly deformed area 640) and the connecting ring portion 70 (easyly deformed area 620) shown in FIGS. It is also possible to arrange so as to combine the deformation sleeve 80 shown in FIGS. 28 to 31 on the front side. At this time, it is preferable to set the axial buckling load of the deformation sleeve 80 smaller than the diameter expansion load of the back side engaging portion 60.

  That is, as shown in FIG. 43 (B), when the holding portion 10 and the power transmission portion 25 are brought close to each other, the deformation sleeve 80 is first buckled to form a so-called washer provided with the front side seat portion 64. After the completion of the buckling, when the holding portion 10 and the transmission portion 25 are made to approach each other by a further strong force, the diameter of the back side engagement piece 62 is expanded, and the hand front seat portion 64 is in the axial direction with the fastened member H Move to the position to engage. In this way, the fastening force can be further enhanced.

  At this time, in the deformation sleeve 80, the easily variable region 620 located at the axial center is made of a soft material (for example, a metal green material), and the hard deformation region 640 that develops the forward facing seat 64 after the completion of buckling is a hard material ( For example, it is preferable to use hardened steel). While facilitating deformation, the strength or rigidity after deformation can be enhanced.

  Next, the fastening device 1 according to the second configuration example will be described with reference to FIG. In the second configuration example, the description and illustration are appropriately omitted by matching the names and / or symbols etc. with respect to the parts having the same function as the parts, members, etc. of the fastening device shown in the first configuration example. The main differences will be explained.

  As shown in FIG. 44 (A), in the present fastening device 1, the second rotation portion 20, the power transmission portion 25, the back side engagement portion 60, and the holding portion 10 are integrally formed in the axial direction. Therefore, it is possible to transmit the rotational power applied to the second rotation unit 20 from the outside to the holding unit 10. The second rotation unit 20, the power transmission unit 25, the back side engagement unit 60, and the sandwiching unit 10 can also be configured, for example, by injection molding a resin material, and cutting a metal material Alternatively, it can be configured by pressing or molding, or can be configured by molding metal or other powder material.

  The back side engaging portion 60 is a deformed sleeve that approaches the outer peripheral surface of the shaft portion 5 and can be easily buckled outward in the radial direction. The radial thickness of the deformation sleeve is thinner than the thickness of the holding portion 10 and / or the power transmission portion 25. Therefore, as shown in the left half of FIG. 44 (A), when the first rotation portion 15 and the second rotation portion 20 are relatively rotated to bring the sandwiching portion 10 and the transmission portion 25 closer, The joint portion 60 is buckled and deformed radially outward to be a so-called washer having a front facing seat portion 64.

  Although not shown in FIG. 44, the power transmission portion 25 adopts a contraction structure capable of axial contraction. This will be described later.

  In addition, while the back side engaging part 60 of this embodiment is integrally comprised between the clamping part 10 and the transmission part 25, while making the clamping part 10 and the transmission part 25 turn, the clamping part is comprised. The power transmission unit 25 and the power transmission unit 25 also serve as an interlocking mechanism for relatively moving the power transmission unit 25 in the axial direction.

  The back side engaging portion 60 is located at the boundary between the central easy deformation region 620A located at the center in the axial direction, the near side easy deformation region 620B located at the boundary between the power transmission portion 25 and the clamping portion 30. An easily deformable region 620C is provided, which is a soft material, a thin-walled material, or a fragile material. On the other hand, after buckling is completed, the portion forming (appearing) the hand-front seat 64, that is, the hard-to-deform regions 640, 640 on both outer sides in the axial direction of the central easy deformation region 620A is made of a hard material, thick material It will be the material. This is because the strength or rigidity after deformation can be increased while facilitating deformation.

  When these are formed of a metal material, for example, a central easy deformation area 620A, a near side easy deformation area 620B, and a far side easy deformation area 620C are provided, and these are soft materials, thin materials, or fragile materials. I assume. On the other hand, at least a part (or in some cases all) of the buckling may be made of a metal green material, and at least a part (in some cases all) of the hard deformation regions 640 may be a hardened steel.

  In addition, although the case where the back side engaging part 60 approaches the outer peripheral surface of the axial part 5 was illustrated in FIG. 44 (A), this invention is not limited to this. For example, as shown in FIG. 44 (B), the back side engaging portion 60 is disposed at a position where a gap is formed in the radial direction from the shaft portion 5 within a range where buckling is possible by the holding portion 10 and the power transmission portion 25. It is good.

  Next, the axial contraction structure of the power transmission unit 25 will be described. For example, as shown to FIG. 45 (A), it is preferable to comprise the transmission part 25 in what is called a bellows shape, and to be expanded-contracted to an axial direction. The extensional load of the power transmission unit 25 is set to be larger than the axial buckling load of the rear engagement unit 60. By doing this, after the buckling of the back side engaging portion 60 is completed, if the clamping portion 10 and the transmitting portion 25 are made to approach with a further strong force, the transmitting portion 25 contracts and the fastened member H It is possible to engage axially.

  As another example, as shown in FIG. 45 (B), the power transmission portion 25 is formed by a first slit 226A having a V-shaped side view and a first slit 226A and 180 which are directed inward from the radially outer side with respect to the cylindrical member. It is also preferable to alternately form the second slits 226B in the axial direction, which provides a phase difference of °. In this case, when the power transmission unit 25 is viewed in a side view, the first and second slits 226A and 226B form a so-called jagged shape (zigzag shape) having a gap in the axial direction. It is possible to contract in the direction.

  The phase and the number of the slits are not particularly limited, and as shown in FIG. 45 (C), the first slit 226A having a V shape in a side view from the radially outer side to the inner side with respect to the cylindrical member A second slit 226B having a phase difference of 180 ° with the one slit 226A, a third slit 226C having a phase difference of 90 ° with the first and second slits 226A, 226B, a 180 ° position with the third slit 226C You may form the 4th slit 226D used as a phase difference. The first and second slits 226A, 226B are at the same axial position, and the third and fourth slits 226C, 226D are at the same axial position, but with respect to the first and second slits 226A, 226B. Position in the axial direction. Even in this case, it is possible to contract in the axial direction by the gap formed in the axial direction.

  Furthermore, the shape of the slit is not particularly limited. The power transmission unit 25 shown in FIG. 46 (A), which is an application of FIG. 45 (B), has first and second slits 226A and 226B of parallel shapes parallel to the direction perpendicular to the axis and forming a gap in the axial direction. Have. The power transmission unit 25 shown in FIG. 46 (B), which is an application of FIG. 45 (C), and first to fourth slits 226A, 226B, 226C, 226D having parallel shapes are provided. Also in these cases, it is possible to contract in the axial direction by the gap formed in the axial direction in the power transmission portion 25.

  Furthermore, the depth (depth) of the slit is not particularly limited. For example, as shown in FIG. 47, which is an application of FIG. 46 (A), the deepest portions (re-back surfaces) of the first and second slits 226A and 226B have an opposite phase to the opening side of the slits. The innermost portion may extend in the radial direction so as to turn to the (180 ° phase difference) side. In this way, the rigidity of the power transmission portion 25 is reduced, and it is possible to softly contract in the axial direction.

  Furthermore, as shown in FIG. 48 which is an application of FIG. 46 (B), the first to fourth slits 226A, 226B, 226C, and the like parallel shape which becomes a fine axial direction clearance with respect to the cylindrical member. After forming 226D (see FIG. 48A), it is elongated so as to axially plastically deform (see FIG. 48B), and the first to fourth slits 226A, 226B, 226C, 226D are formed. It is also possible to extend the in the axial direction, resulting in a V-shaped slit in side view.

  The axial contraction structure of the power transmission unit 25 described with reference to FIGS. 45 to 48 can be applied to the power transmission unit 25 of the fastening device 1 described in the first configuration example.

  Although the raw material itself of the power transmission part 25 illustrated the case where it does not expand-contract in an axial direction in the 1st structural example, this invention is not limited to this. For example, as shown in FIG. 49, the transmission portion 25 may be provided with a cylindrical thin portion 25A approaching the outer peripheral surface of the shaft portion 5. As a result, since the clearance gap M can be secured between the power transmission portion 25 and the hole HP of the fastened member H, the thin portion 25A is deformed in the radial direction in the clearance gap M, and the axial dimension is reduced. It is possible to shrink. As a result, since the fastening amount by the back side engaging portion 60 and the second rotation portion 20 can be secured, it is possible to flexibly cope with the thickness change of the to-be-fastened member H. Here, although the thin portion 25A has a cylindrical shape, it may have a bowl shape in which a plurality of rod-like members extending in the axial direction are arranged in the circumferential direction.

  As shown in FIG. 49 (B), the thin portion 25A may be brought closer to the hole HP side of the fastened member H, and as shown in FIG. 49 (C), one end of the thin portion 25A. Can approach the hole HP of the to-be-fastened member H, and the other end can approach the outer peripheral surface of the shaft 5 to form an inclined cylindrical shape. Although the second rotating portion is not shown, as shown in FIG. 50A, both ends of the thin portion 25A approach the hole HP of the fastened member H, and the center side is on the outer peripheral surface of the shaft 5 It can also be in the form of a curved tube that approaches. As shown in FIG. 50 (B), both ends of the thin portion 25A approach the outer peripheral surface of the shaft 5, and the center side has a curved cylindrical shape approaching the hole HP of the member H to be fastened. it can. As shown in FIG. 50 (C), a certain range approaches the hole HP of the fastened member H from the both ends of the thin portion 25A toward the center, and the center side excluding these approaches the outer peripheral surface of the shaft 5 It can also be made into a curved shape.

  Furthermore, as shown in FIG. 50 (D), the thin-walled portion 25A may have a cylindrical structure whose cross section is non-circular. For example, the cross-sectional shape can be a star shape, a polygonal shape, a sawtooth shape continuous in the circumferential direction, a jagged shape, a zigzag shape, or a wave shape. At this time, by forming the opening 25D in the middle of the thin portion 25A, it is possible to form the fragile region 25E which is easily buckled or deformed in the axial direction.

  Further, as shown in FIG. 50 (E), a wave ring piece in which a ring-shaped member is formed in a wave shape is laminated in multiple stages in the axial direction as the transmission portion 25 or wave winding while winding a wire in a spiral shape. It can also be a so-called wave spring configured by laminating in a shape. In this case, it is possible to expand and contract by elastically deforming in the axial direction. Instead of the wave spring, a so-called coil spring may be used.

  In any of FIGS. 49 and 50, in the axial force required when the back side engaging portion 60 is deformed or displaced, the power transmitting portion 25 is prevented from being contracted in the axial direction, and the larger shaft When a force (i.e., an axial force at the time of fastening) acts, it is made to contract positively.

  Although the case where the number of deformation sleeves of the back side engaging portion 60 is one is illustrated here, a plurality of deformation sleeves are separately or integrally arranged in the axial direction, and each deformation sleeve is buckled to perform multistage washers. It is also possible to

  Furthermore, in the first configuration example, with the receiving portion 11 of the holding portion 10 and the back side engaging surface 66 of the back side engaging portion 60 as a tapered surface, using the tapered surface, the back side engaging portion 60 Although the case where the back side engagement piece 62 is moved radially outward is illustrated, the present invention is not limited to this.

  For example, as shown in FIG. 51 and FIG. 52, the back side engaging portion 60 is a first back side engaging piece 660 disposed on the near side, and a second back side engaging piece 680 disposed on the back side. An elastically deformable restricting portion 610 may be provided, which annularly surrounds the rear engagement pieces 660 and 680. The restriction portion 610 is made of, for example, a material such as rubber, and biases the back side engagement pieces 660 and 680 radially inward. In addition, the back side engagement pieces 660 and 680 are considered to be a hard-to-deform area, and the restricting portion 610 corresponds to the easily-deformable area.

  Here, similarly to the modification shown in FIGS. 41 to 43, the male screw portion 32 is disposed on the front side of the shaft portion 5 to form a female screw body, and the second rotating portion 20 is a female screw on the inner circumferential surface using the nut. The case where a screwing part is comprised by arrange | positioning a part and screwing this external thread part 32 and an internal thread part is shown.

  As shown in FIG. 55, the first back engagement piece 660 and the second back engagement piece 680 have a common shape, and have through holes 661 and 681 extending in the axial direction, respectively. The holes 661 and 681 have an elongated hole shape that spreads in the radial direction when viewed from the axial direction. In addition, in FIG. 55, the first back side engagement piece 660 is in a posture inverted in the axial direction and the diameter direction.

  The first back engagement piece 660 and the second back engagement piece 680 are slidable in the radial direction by the amount of the oval hole in a state where the shaft portion 5 is penetrated through the through holes 661 and 681. . Further, the first back engagement piece 660 and the second back engagement piece 680 have abutment surfaces 663 and 683 that abut (face) each other, and the abutment surfaces 663 and 683 pass through. The holes 661 and 681 are inclined in the direction of the long hole.

  Referring back to FIG. 51, although the first back engagement piece 660 and the second back engagement piece 680 have a common shape, they are in a state where they are mutually reversed in the axial direction and reversed in the diameter direction, that is, the contact surfaces They are arranged in point symmetry such that 663 and 683 face each other. As a result, the back side engagement surface 66 of the back side engagement portion 60 and the front facing seat portion 64 become parallel in the direction perpendicular to the axis, and the contact surfaces 663 and 683 are inclined.

  Therefore, as shown in FIG. 53 and FIG. 54, when the pinching force is applied to the contact surfaces 663 and 683 by bringing the pinching portion 10 and the power transmitting portion 25 close, the biasing force of the regulating portion 610 is resisted. While, the first back engagement piece 660 moves in one of the diametrical directions, and the second back engagement piece 680 moves in the other of the diametrical direction. That is, the first back engagement piece 660 and the second back engagement piece 680 are separated from each other in the diameter direction. As a result, the forward facing seat portions 64 respectively formed on the first back engagement pieces 660 and the second back engagement pieces 680 move radially outward and project beyond the transmission portions 25. As described above, it is also preferable to separate the plurality of members radially outward by configuring the back side engaging portion 60 with a plurality of members and arranging the tapered surface inside.

  In addition, according to the fastening device of the second configuration example, it is possible to make the rotational direction of relative rotation between the first pivoting portion 15 and the second pivoting portion 20 reverse to the direction of fastening, and vice versa When the rotation is performed, the first back side engagement piece 660 and the second back side engagement piece 680 can be returned to the original coaxial position by the contraction force of the restricting portion 610 which is in the urging state with respect to the contraction direction. Therefore, it is also possible to remove the fastening device 1 that was in the fastening state with respect to the fastened member H from the fastened member H.

  Further, in the above-described modified example shown in FIG. 51 to FIG. 55, the case is illustrated in which the back side engaging portion 60 is arranged in a relatively rotatable manner in the circumferential direction with respect to the sandwiching portion 10 and the power transmitting portion 25. However, the present invention is not limited to this.

  For example, as shown in FIG. 56 and FIG. 62, for the receiving portion 11 in the sandwiching portion 10, the receiving portion guiding unevenness 11x extending in the oval direction (diameter direction of the shaft portion 5) of the through holes 661 and 681 is formed. , Forming engagement piece guide irregularities 664 and 684 extending in the diameter direction of the shaft portion 5 with respect to the respective back side engagement surfaces 66 of the first back side engagement piece 660 and the second back side engagement piece 680 Thus, the receiving portion guiding unevenness 11x and the engaging piece guiding unevenness 664 and 684 can be slidably engaged in the diameter direction and circumferentially engaged. In this case, the first back engagement piece 660 and the second back engagement piece 680 engage with the receiving portion 11 in the circumferential direction. Power can be transmitted to the

  That is, as in the case shown in FIG. 28 etc., in the case where the screwing portion 30 is formed between the shaft portion 5 and the holding portion 10 and the holding portion 10 and the shaft portion 5 are relatively rotated, Since the part 60 exists between the holding part 10 and the power transmission part 25 and can be rotated together, it can double as the interlocking mechanism in the present invention.

  In addition, with respect to the contact surfaces 663 and 683 of the first back side engagement piece 660 and the second back side engagement piece 680, the inner guide unevenness 663a and 683a extending in the same direction as the guide unevenness for the engagement piece 664 and 685. And the inner guide asperities 663a, 683a can be slidably engaged in the diametrical direction and in the circumferential direction. In this case, the first back engagement piece 660 and the second back engagement piece 680 slidably engage in the diameter direction and engage in the circumferential direction. Power can be transmitted between the back engagement pieces 680.

  Further, the guide projections and depressions 64 x for the seat portion are formed on the front facing seat portion 64 of the first back engagement piece 660 and the second back engagement piece 680, and the back end face 26 of the power transmission portion 25. On the other hand, it is possible to form a guide for the power transmission portion 26x extending in the diametrical direction, and for the seat portion guide asperity 64x and the power transmission portion guide asperity 26x to be slidably slidable in the diameter direction and in the circumferential direction. it can. Thus, the first back side engagement piece 660 and the second back side engagement piece 680 engage with the power transmission portion 25 in the circumferential direction, so the power transmission portion 25 is engaged with the back side engagement portion. The rotational power can be transmitted to 60. With the above configuration, as shown in FIG. 57, the rotational power of the transmission portion 25 can be transmitted to the sandwiching portion 10 through the back side engaging portion 60, so it doubles as the interlocking mechanism 90 shown in the first configuration example ( Can be omitted).

  As shown in FIGS. 58 and 59, when the holding portion 10 and the power transmission portion 25 are brought close to each other and the holding force is applied to the contact surfaces 663 and 683, the power guiding portion irregularities 26x, the seat portion guiding irregularities The first back-side engagement against the biasing force of the restricting portion 610 while being guided in the diametrical direction by 64x, the internal guide irregularities 663a, 683a, the engagement piece guide irregularities 664, 684, and the receiving part guide irregularities 11x. The piece 660 and the second back engagement piece 680 are separated from each other in the diametrical direction. As a result, the forward facing seat portions 64 respectively formed on the first back engagement pieces 660 and the second back engagement pieces 680 move radially outward and project beyond the transmission portions 25.

  In the above modification, the two first back engagement pieces 660 and the second back engagement pieces 680 are engaged in the circumferential direction with respect to the power transmission portion 25 and the sandwiching portion 10 in the diameter direction. Although the case of separating is illustrated, the present invention is not limited to this, and for example, the front facing seat portion 64 of each back side engaging piece 62 of the back side engaging portion 60 shown in the first configuration example of FIG. A guiding asperity extending in the radial direction is formed on the back side engaging surface 66, and the guiding asperity is engaged with the guiding asperity formed in the same direction with respect to the power transmission portion 25 and the receiving portion 11. You may make it That is, the back side engaging portion 60 may be able to transmit the rotational power of the power transmission portion 25 to the sandwiching portion 10 by forming the guide asperities radially on the mutual contact surfaces.

  Further, various shapes can be selected as the shape of the guide asperities which are slidable in the radial direction and engaged in the circumferential direction, such as a cross-sectional sawtooth shape, a rectangular cross-sectional shape, and dovetail grooves which can not be separated from each other.

  Furthermore, in the first and second configuration examples, the back side engaging portion 60 is mainly illustrated in a single step in the axial direction, but as shown in FIG. 63, for example, the back side engaging portion 60 is in the axial direction A plurality of multistaged back engagement pieces 690A, 690B, 690C are provided, and each back engagement piece 690A, 690B, 690C is made radially outward while axially contracting in a nested structure or telescopic structure. Expansion is also preferred. If the rear engagement pieces 690A, 690B, 690C are engaged in the axial direction in the expansion completion state, only by engaging the rear inner engagement pieces 690C with the clamping portion 10 and the power transmission portion 25 only, The back side engagement piece 690A disposed at the outermost side can be held in the axial direction. As a result, it is possible to set a large amount of radial movement of the rear engagement piece 690A disposed at the outermost side. These back side engagement pieces 690A, 690B, 690C become a difficult deformation area, and a ring portion (not shown) in particular becomes an easy deformation area.

  Next, another modification of the first or second configuration example will be described.

  FIGS. 64 (A) to (C) show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 or the rear engagement section 60. FIG. This contraction or expansion structure is a so-called PCCP shell (Pseudo-Cylindrical Concave Polyhedral Shell) structure P in which truss (triangular skeleton structure) are combined in a three-dimensional manner, and the points (apex parts) where the triangle vertices meet Points (bases) at which base portions projecting radially outward and extending in the direction perpendicular to the axis are in contact with each other are recessed radially inward. The point (transition part) where the hypotenuses of the triangle are in contact connects the apex and the base. The polyhedron can constitute a pseudo cylinder. The present PCCP shell structure P can be contracted (deformed) in the axial direction, with the apex projecting radially outward. The PCCP shell structure P may be applied to the power transmission portion 25 or the back side engagement portion 60. Therefore, the inside of the triangle is a difficultly deformed region, and each side or each vertex of the triangle can form an easily deformable region that can be easily deformed by the fold.

  FIGS. 64 (D) to (F) show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 or the rear engagement section 60. FIG. This contraction or expansion structure is a telescopic pipe structure D in which a truss (framework structure) utilizing a trapezoid is combined three-dimensionally, and a portion (short side portion) where the short sides of the trapezoid extending in the direction perpendicular to the axis intersect A portion (long side portion) protruding radially outward and in contact with the long sides extending in the direction perpendicular to the axis is recessed radially inward. Where the oblique sides are in contact (transition part), the short side and the long side are connected. The polyhedron can constitute a pseudo cylinder. The telescopic tube structure D can be contracted (deformed) in the axial direction, and at that time, the short side portion protrudes outward in the radial direction. The telescopic tube structure D may be applied to the transmission portion 25 or the back side engaging portion 60. Therefore, the in-plane of the trapezoid is a hard-to-deform area, and each side or vertex of the trapezoid can form an easily-deformable area that can be easily deformed by the fold. It is also possible to use a parallelogram instead of a trapezoid. As a reference, FIG. 64 (G) shows a state in which this type of PCCP shell structure or telescopic tube structure is contracted in the axial direction. Generally, the telescopic tube structure D can be deformed more easily in the axial direction than the PCCP shell structure P.

  FIG. 64 (H) is an example in which both the PCCS shell structure P and the telescopic tube structure D are applied to the power transmission section 15. In this case, the telescopic tube structure D shrinks preferentially. FIG. 64 (I) shows an example in which the telescopic pipe structure D is applied to a part of the transmission portion 25, the remaining part is a cylinder having a polygonal cross section that becomes straight, and the telescopic pipe structure D is applied to the back side engaging portion 60. It is. A neck is formed at the boundary between the power transmission portion 25 and the rear engagement portion 60. FIGS. 64 (J) and 64 (K) show an example in which the telescopic pipe structure D is applied to the transmission portion 25 and the telescopic pipe structure D is applied to the back side engaging portion 60, respectively. In the case of, it forms a constriction at its boundary.

  FIG. 64 (L) is an example in which the second rotation unit 20, the transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed, and the PCCP shell structure P is applied to the transmission unit 25, The telescopic tube structure D is applied to the back side engaging portion 60.

  65 (A) is an example in which the second rotation unit 20, the transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed. Here, further, slits in the circumferential direction are formed on the outer peripheral surface of the central portion in the axial direction of the back side engaging portion 60 to make the easily deformable region 620A, and further, the both sides of the easily deformable region 620A in the axial direction difficult to deform , The easily deformable regions 620B and 620C are formed by the constriction structure.

  FIG. 65 (B) is an example in which the second rotation unit 20, the power transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed. Here, in the back side engaging portion 60, the axial center side is radially bent outward, and circumferential slits are formed on the outer peripheral surface of the axial center portion to form an easily deformable region 620.

  65C and 65D show an example in which the second rotation unit 20, the transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed. Here, in the back side engaging portion 60, the axial center side is curved so as to be bent radially outward, and the thickness becomes thinner toward the tip end. Further, a plurality of notches extending in the axial direction are circumferentially formed in the central portion in the axial direction, whereby the central portion in the axial direction is made the easily deformable region 620. The transmission portion 25 forms a plurality of openings 25D in the form of a matrix in the middle of the axial direction, thereby forming a fragile region which is easily buckled or deformed in the axial direction.

  FIG. 65 (E) is an example in which the second rotation unit 20, the power transmission unit 25, the back side engagement unit 60, and the holding unit 10 are integrally formed. Here, in the back side engaging portion 60, the axial center side is curved radially outward, and the thickness is made thinner toward the tip end. By this thin-walled structure, an axially central portion is made an easily deformable region 620.

  FIG. 65 (F) is an example in which five or more back side engaging pieces 62 are arranged in the circumferential direction in the back side engaging part 60, and the link ring part 72 is arranged therebetween.

  In the first and second modified examples, the back side engaging portion has an easily deformable region where deformation is easy with respect to an external force, and a difficultly deformable region which is less likely to be deformed than an easily deformable region with respect to an external force. Although the case is illustrated, the present invention is not limited to this, and includes the case where the entire back engagement portion is configured with a common strength or rigidity.

  As described above, the present invention can take various configurations, and is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fastening device 5 Shaft part 10 Clamping part 11 Receiving part 11a First receiving part 11b Second receiving part 11c Stepped part 15 First rotation part 16 Backward seat part 16a First rotation part side unevenness 20 second rotation part 21 back facing seat portion 21a rotating portion side inclined surface 21ax first rotating portion side inclined region 21ax first rotating member side inclined region 21ax first rotating portion side inclined region 21ay second rotating portion side inclined region 21b times Moving part side contact part 21bx first rotation part side contact area 21by second rotation part side contact area 21c rotation part side step part 22 front side end face 22a second rotation part side unevenness 22 front side end face 25 Power transmission portion 25A Thin-walled portion 25D Opening 25E Fragile region 26 Back side end face 26c Step 27 Front side end face 28A First transmission piece 28B Second transmission piece 29 Shearing portion 30 Screwing portion 60 Back side engaging portion 62 Back side Engaging piece 64 Seat 66 Back side engagement surface 66a First back side engagement surface 66b Second back side engagement surface 70 projection restricting portion 72 connecting ring portion 80 deformation sleeve 82 buckling region 84 non-buckling region 90 interlocking mechanism 92 interlocking sleeve 94 sleeve accommodation hole 1060 cylindrical portion 1100 receiving portion 1140 first internal thread spiral structure 1150 first portion Two female screw helical structure 1400 first male screw helical structure 1500 second male screw helical structure 1600 reverse rotation preventing portion 1680 projecting portion 1680a engagement edge 3500 shaft portion side unevenness H to-be-fastened member HP hole hp1 hole hp2 hole HPa member side inclined surface HX member Side seat HXa Member side inclined surface HXb Member side contact part HXbx Second member side contact area HXby First member side contact area HXc Member side step part Z Rotational engagement mechanism V Reverse rotation prevention mechanism

Claims (10)

A clamping portion disposed on the far side in the axial direction;
First and second pivoting portions disposed on the front side in the axial direction and capable of relative pivoting with each other;
A power transmission unit disposed between the first and second rotation units and the clamping unit to transmit an axial force;
A back facing seat which is formed on at least one of the first rotation part and the second rotation part, faces the back side, and contacts the member to be fastened;
A back side engaging portion axially held between the power transmission portion and the holding portion;
A screwing portion for converting relative rotation of the first rotating portion and the second rotating portion into relative movement of the holding portion and the power transmitting portion in the axial direction;
A reverse rotation preventing mechanism which permits relative rotation in one direction of the first rotating portion and the second rotating portion and restricts relative rotation in the other direction;
Have
The back side engaging portion is formed by bringing the first rotation portion and the second rotation portion into relative rotation in the one direction to cause the holding portion and the transmission portion to approach in the axial direction. And forming a forward facing seat projecting radially outward from the power transmission section and facing the front side,
Using the hand forward seat and the rear-facing seat, engage the workpieces,
Along the relative rotation axis of the first rotation part and the second rotation part between the back-to-back seat and the external member located around the to-be-fastened member and / or the back-to-back seat, A pivoting engagement mechanism configured to hold a state in which the back facing seat is engaged in the circumferential direction even when a rotational force is applied;
The rotary engagement mechanism holds the state of circumferential engagement with each other by fitting the accommodation recess formed in the to-be-fastened member and / or the outer member with the back facing seat. Characterized by
Fastening device. A clamping portion disposed on the far side in the axial direction;
First and second pivoting portions disposed on the front side in the axial direction and capable of relative pivoting with each other;
A power transmission unit disposed between the first and second rotation units and the clamping unit to transmit an axial force;
A back facing seat which is formed on at least one of the first rotation part and the second rotation part, faces the back side, and contacts the member to be fastened;
A back side engaging portion axially held between the power transmission portion and the holding portion;
A screwing portion for converting relative rotation of the first rotating portion and the second rotating portion into relative movement of the holding portion and the power transmitting portion in the axial direction;
A reverse rotation preventing mechanism which permits relative rotation in one direction of the first rotating portion and the second rotating portion and restricts relative rotation in the other direction;
Have
The back side engaging portion is formed by bringing the first rotation portion and the second rotation portion into relative rotation in the one direction to cause the holding portion and the transmission portion to approach in the axial direction. And forming a forward facing seat projecting radially outward from the power transmission section and facing the front side,
Engaging with the to-be-fastened member using the hand-front seat portion and the back-facing seat portion,
Along the relative rotation axis of the first rotation part and the second rotation part between the back-to-back seat and the external member located around the to-be-fastened member and / or the back-to-back seat, A pivoting engagement mechanism configured to hold a state in which the back facing seat is engaged in the circumferential direction even when a rotational force is applied;
The back facing seat has a contact portion whose distance from the relative rotation axis is different along the circumferential direction at the periphery,
The rotational engagement mechanism is configured by the contact portion being in contact with the to-be-fastened member and / or the external member and engaged in the circumferential direction,
Fastening device. The screwing portion is
A female screw helical structure set to an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole of the cylindrical part;
An external thread helical structure set to an appropriate lead angle and / or lead direction formed on the circumferential surface of the shaft;
The reverse rotation prevention mechanism is
Shaft-portion-side irregularities formed on the circumferential surface of the shaft,
Intermittently or continuously provided with a projecting portion provided on the cylindrical portion and extending radially inward toward the axial portion, and engaged with the axial portion side unevenness by the projecting end of the projecting portion A reverse rotation preventing portion that forms an engaging edge,
The engagement edge of the reverse rotation preventing mechanism may be elastically deformed with the proximal end side as a fulcrum, and the relative movement in the one direction is repeated while the elastic deformation is repeated, and the relative rotation in the other direction is performed. Characterized by locking,
The fastening device according to claim 1 or 2 . The screwing portion is
A female screw helical structure set to an appropriate lead angle and / or lead direction formed on the inner peripheral surface of the hole of the cylindrical part;
A first male screw helical structure set to an appropriate lead angle and / or lead direction formed on the circumferential surface of the shaft;
The reverse rotation prevention mechanism is
A second male screw helical structure formed on the circumferential surface of the shaft portion so as to overlap the first male screw helical structure and having a lead angle and / or a lead direction different from the first male screw helical structure;
A protrusion is provided on the cylindrical portion and extends radially inward toward the shaft, and the protrusion sets the lead angle and / or the lead direction different from the female screw helical structure. Reverse rotation preventing portion constituting an intermittent or continuous engagement edge to be
The engagement edge of the reverse rotation preventing mechanism may be elastically displaced, and when rotating in one direction relatively, it is moved while repeating the elastic displacement, and the relative rotation in the other direction is locked.
The fastening device according to claim 1 or 2 . A receiving portion having an abutting surface is formed on an end face of the cylindrical portion,
The reverse rotation preventing portion is configured to be disposed on the contact surface,
When the contact surface is viewed in a cross section perpendicular to the axis, cross-sectional images of the contact surface may be obtained at a plurality of circumferential positions of the shaft and / or the cross-sectional image may be obtained in an annular shape. And
The fastening device according to claim 4 . A first circumferential engaging portion is formed on the receiving portion,
The reverse rotation preventing portion is formed with a second circumferential engaging portion that is circumferentially engageable with the first circumferential engaging portion,
The cylindrical portion and the reverse rotation preventing portion are fixed in the circumferential direction by the first circumferential engaging portion and the second circumferential engaging portion.
The fastening device according to claim 4 or 5 . A first axial engaging portion is formed in the receiving portion,
The reverse rotation preventing portion is formed with a second axial engaging portion engageable with the first axial engaging portion in the axial direction.
The cylindrical portion and the reverse rotation preventing portion are fixed in the axial direction by the first axial engaging portion and the second axial engaging portion.
The fastening device according to any one of claims 4 to 6 . The reverse rotation prevention mechanism is
The first rotating portion side unevenness formed in the first rotating portion, and the second rotating portion side formed in the second rotating portion and engaged with the first rotating portion side unevenness in the circumferential direction With the unevenness,
When relative rotation is allowed in the one direction, relative movement between the first rotating portion side unevenness and the second rotating portion side unevenness is allowed, and the relative rotation in the other direction is attempted, the first rotation The second aspect of the present invention is characterized in that the relative unevenness is prevented by engaging the second unevenness and the second unevenness.
The fastening device according to claim 1 or 2 . The pivoting engagement mechanism is held in a state of being engaged with each other in the circumferential direction by fitting the accommodation recess formed in the to-be-fastened member and / or the external member and the back facing seat to each other. Feature
A fastening device according to any of the preceding claims. The rotating engagement mechanism is formed on the back facing seat, and the rotating part side stepped part engaged with the member to be fastened and / or the member side stepped part stepped in the axial direction in the external member Characterized by
The fastening device according to any one of claims 1 to 9 .

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