JP7012035B2 - Fastener - Google Patents

Description

The present invention relates to a fastener consisting of bolts and nuts.

Conventionally, a method of using bolts and nuts, for example, when attaching another member to one member has been known. As a fastening structure using such bolts and nuts, for example, there is one disclosed in Patent Document 1 and the like. In the fastening structure disclosed in Patent Document 1, the fastening structure does not loosen in the fastened state, can be easily loosened during maintenance, and the bolts and nuts can be reused.

Japanese Unexamined Patent Publication No. 2018-138814

Conventionally, in order to prevent the nut from loosening when the nut is fastened to the bolt, it is necessary to have a complicated structure, which causes a problem that the cost is high and the work of fastening is troublesome.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a fastening device in which a nut is less likely to loosen from a bolt due to a simple configuration.

The fastening device of the present invention has a head portion, a rod-shaped first screw portion having a male screw portion that is provided so as to extend from the head portion and is wound in the first direction on the outer peripheral surface, and the tip of the first screw portion. A bolt having a rod-shaped second threaded portion having a male threaded portion formed on the outer peripheral surface of a male screw portion that is provided so as to extend from the first direction and is wound in a second direction opposite to the first direction, a nut portion, and the nut portion. The male screw portion that protrudes from and winds in the second direction has a protrusion formed on the outer peripheral surface, and the female screw portion into which the male screw portion of the first screw portion is screwed is formed on the inner peripheral surface. A main body nut provided with a screw hole, and an intermediate member provided with a screw hole having a female screw portion formed on the inner peripheral surface of a female screw portion into which the male screw portion of the second screw portion is screwed. A hollow portion that covers the protrusion and the intermediate member of the main body nut and has a female screw portion formed on the inner peripheral surface to which the male screw portion formed on the outer peripheral surface of the protrusion of the main body nut is screwed. It is characterized by being provided with an auxiliary nut that is formed.

According to such a fastener, the first screw portion and the second screw portion of the bolt have threads wound in opposite directions, and the first screw portion of the bolt and the protrusion portion of the main body nut are used. The winding direction of the screw thread is opposite. Moreover, the auxiliary nut is attached to the protrusion of the main body nut so that the auxiliary nut covers the protrusion of the main body nut and the intermediate member. As a result, an impact is applied to the member to be fastened by the fastening device, or an impact is applied to the bolt or the main body nut itself, so that the force in the direction of loosening the bolt from the first screw portion with respect to the main body nut is applied. Even if it is applied, the main body nut is prevented from loosening from the first threaded portion of the bolt.

In the fastening device of the present invention, the diameter of the first threaded portion of the bolt may be larger than the diameter of the second threaded portion.

Further, the inner peripheral surface of the hollow portion of the auxiliary nut covers the protrusion of the main body nut and the intermediate member, and when the auxiliary nut is attached to the protrusion of the main body nut, the intermediate surface thereof is formed. It may be configured to come into contact with the outer peripheral surface of the member.

Further, the intermediate member may be in the shape of a truncated cone.

In this case, when the auxiliary nut is attached to the protrusion of the main body nut while covering the protrusion of the main body nut and the intermediate member on the inner peripheral surface of the hollow portion of the auxiliary nut. A tapered portion that comes into contact with the side surface of the intermediate member may be formed.

Further, the female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is screwed with the male screw portion of the right-hand screw in the first screw portion of the bolt. The female screw portion formed on the inner peripheral surface of the screw hole of the intermediate member is a screw portion of the male screw portion of the left screw in the second screw portion of the bolt, and is of the auxiliary nut. The female threaded portion formed on the inner peripheral surface of the hollow portion may be screwed with the male threaded portion of the left-hand thread in the protrusion of the main body nut.

Alternatively, the female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is screwed with the male screw portion of the left screw in the first screw portion of the bolt. The female screw portion formed on the inner peripheral surface of the screw hole of the intermediate member is a screw portion of the male screw portion of the right-hand screw in the second screw portion of the bolt, and is of the auxiliary nut. The female threaded portion formed on the inner peripheral surface of the hollow portion may be screwed with the male threaded portion of the right-hand thread in the protrusion of the main body nut.

According to the fastening device of the present invention, the nut can be prevented from loosening from the bolt by a simple structure.

It is a side view which shows the structure of the fastening device by embodiment of this invention. It is a side view which shows the structure of the LR bolt in the fastener | fastener shown in FIG. It is a perspective view which shows the structure of the main body nut in the fastener | fastener shown in FIG. It is a side view of the main body nut shown in FIG. It is a top view of the main body nut shown in FIG. It is a perspective view which shows the structure of the intermediate member in the fastener | fastener shown in FIG. It is a side view of the intermediate member shown in FIG. It is a top view of the intermediate member shown in FIG. It is a perspective view which shows the structure of the auxiliary nut in the fastener | fastener shown in FIG. It is a side view of the auxiliary nut shown in FIG. It is a top view of the auxiliary nut shown in FIG. It is explanatory drawing which shows the method of fixing the 2nd member to the 1st member by the fastening tool shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 12 are diagrams showing a fastening device according to the embodiment of the present invention and a fastening method using such a fastening device. In the fastening device according to the present embodiment, for example, the second member 102 is fixed to the first member 100. Details of the configuration of such a fastener will be described below.

As shown in FIG. 1, the fastener according to the present embodiment includes an LR bolt 10, a main body nut 20, an intermediate member 30, and an auxiliary nut 40, and the intermediate member 30 is covered with the auxiliary nut 40. By attaching the main body nut 20 and the auxiliary nut 40 to the LR bolt 10, the second member 102 is fixed to the first member 100. Details of each component of such a fastener will be described below.

As shown in FIG. 2, the LR bolt 10 is provided so as to extend from the head portion 12, the rod-shaped first screw portion 14 provided so as to extend from the head portion 12, and the tip of the first screw portion 14. It has a rod-shaped second screw portion 16. Here, the center line extending in the longitudinal direction in the first threaded portion 14 and the center line extending in the longitudinal direction in the second threaded portion 16 coincide with each other. Further, a male screw portion 14a of a right-handed screw is formed on the outer peripheral surface of the first screw portion 14. On the other hand, a male threaded portion 16a of a left-handed screw is formed on the outer peripheral surface of the second threaded portion 16. As described above, the winding direction of the screw thread of the first screw portion 14 and the second screw portion 16 is opposite to each other. Further, as shown in FIG. 2, in the LR bolt 10, the diameter of the first screw portion 14 is larger than the diameter of the second screw portion 16.

As shown in FIGS. 3 to 5, the main body nut 20 has a nut portion 22 made of a hexagon nut and a protrusion 24 protruding upward from the upper surface of the nut portion 22. Further, in these nut portions 22 and protrusions 24, screw holes 26 having a substantially circular cross section are formed so as to penetrate the nut portions 22 and protrusions 24, and the inner peripheral surface of the screw holes 26 is formed. , A female threaded portion 26a corresponding to a male threaded portion 14a of a right-hand thread in the first threaded portion 14 of the LR bolt 10 is formed. Then, the male screw portion 14a of the first screw portion 14 of the LR bolt 10 is screwed into the female screw portion 26a formed on the inner peripheral surface of the screw hole 26 in the main body nut 20, whereby the LR bolt 10 is screwed. The main body nut 20 can be attached to the first screw portion 14. More specifically, with respect to the first screw portion 14 of the LR bolt 10, the main body nut 20 is rotated clockwise (clockwise) in FIG. 3, and the first screw portion 26a of the screw hole 26 is first. The male screw portion 14a of the screw portion 14 is fitted into the male screw portion 14a. Further, the protrusion 24 has a substantially cylindrical shape, and a left-handed male screw portion 24a is formed on the outer peripheral surface of the protrusion 24. Further, the height of the main body nut 20 is the same as the length of the second member 102 protruding from the second member 102 in the first screw portion 14 when the second member 102 is attached to the first member 100 by the main body nut 20. Or it is slightly larger than this protruding length.

As shown in FIGS. 6 to 8, the intermediate member 30 has the shape of a truncated cone, which is a truncated cone with a circular bottom surface. In other words, the intermediate member 30 is a three-dimensional figure obtained by cutting a cone in a plane parallel to the bottom surface and removing the small cone portion. The side surface 30a of such an intermediate member 30 is tapered so as to be inclined with respect to the axis of the truncated cone (that is, the line extending in the vertical direction in FIG. 7). Further, a screw hole 32 is formed in the intermediate member 30 so as to penetrate the intermediate member 30, and a male left-handed screw in the second screw portion 16 of the LR bolt 10 is formed on the inner peripheral surface of the screw hole 32. A female screw portion 32a corresponding to the portion 16a is formed. Then, the male screw portion 16a of the second screw portion 16 of the LR bolt 10 is screwed into the female screw portion 32a formed on the inner peripheral surface of the screw hole 32 in the intermediate member 30, whereby the LR bolt 10 is screwed. The intermediate member 30 is attached to the second screw portion 16. More specifically, with respect to the second threaded portion 16 of the LR bolt 10, the intermediate member 30 is rotated counterclockwise (counterclockwise) in FIG. The male screw portion 16a of the screw portion 16 of the above is fitted.

As shown in FIGS. 9 to 11, the auxiliary nut 40 is composed of, for example, a hexagon nut, and the auxiliary nut 40 is formed with a hollow portion 42. Here, as shown in FIG. 10, the hollow portion 42 penetrates the auxiliary nut 40 so that the second screw portion 16 of the LR bolt 10 can be passed through the hollow portion 42. More specifically, as shown in FIG. 10, the inner peripheral surface of the auxiliary nut 40 facing the hollow portion 42 is composed of a tapered portion 42a and a female threaded portion 42b following the tapered portion 42a. The tapered portion 42a is inclined with respect to the axis of the auxiliary nut 40 (that is, the line extending in the vertical direction in FIG. 10), and the tapered portion 42a is configured to fit the side surface 30a of the intermediate member 30. There is. In other words, when the intermediate member 30 is inserted into the hollow portion 42 of the auxiliary nut 40, the side surface 30a of the intermediate member 30 comes into contact with the tapered portion 42a of the auxiliary nut 40. There is no gap between the side surface 30a of the above and the tapered portion 42a of the auxiliary nut 40. Further, the female screw portion 42b formed on the inner peripheral surface of the hollow portion 42 of the auxiliary nut 40 corresponds to the male screw portion 24a of the left screw in the protrusion 24 of the main body nut 20. Then, the male screw portion 24a of the protrusion 24 of the main body nut 20 is screwed into the female screw portion 42b of the hollow portion 42 of the auxiliary nut 40 so that the auxiliary nut 40 can be attached to the main body nut 20. .. More specifically, with respect to the protrusion 24 of the main body nut 20, the auxiliary nut 40 is rotated counterclockwise (counterclockwise) in FIG. Make sure that the screw portion 24a is fitted.

Next, the operation when the second member 102 is fixed to the first member 100 by using the fastening device of the present embodiment will be described below with reference to FIG.

First, by passing the first threaded portion 14 and the second threaded portion 16 of the LR bolt 10 through through holes (not shown) formed in the first member 100 and the second member 102, respectively. , The first threaded portion 14 and the second threaded portion 16 of the LR bolt 10 are made to protrude from the second member 102. Next, as shown in FIG. 12A, the main body nut 20 is attached to the first screw portion 14 of the LR bolt 10. Specifically, with respect to the first screw portion 14 of the LR bolt 10, the main body nut 20 is rotated clockwise (clockwise) in FIG. 3, and the first screw portion 26a of the screw hole 26 is first. The male screw portion 14a of the screw portion 14 is fitted into the male screw portion 14a. Further, the main body nut 20 is tightened to the first screw portion 14 of the LR bolt 10 until the bottom surface of the main body nut 20 comes into contact with the second member 102. At this time, since the height of the main body nut 20 is the same as the length protruding from the second member 102 in the first screw portion 14, or slightly larger than this protruding length, the first screw The portion 14 is hidden by the main body nut 20.

Next, as shown in FIG. 12B, the intermediate member 30 is attached to the second threaded portion 16 of the LR bolt 10. Specifically, the intermediate member 30 is rotated counterclockwise (counterclockwise) in FIG. 6 with respect to the second screw portion 16 of the LR bolt 10 and is second to the female screw portion 32a of the screw hole 32. The male screw portion 16a of the screw portion 16 of the above is fitted. Further, the intermediate member 30 is tightened to the second screw portion 16 of the LR bolt 10 until the bottom surface of the intermediate member 30 comes into contact with the protrusion 24 of the main body nut 20. Next, as shown in FIG. 12 (c), the auxiliary nut 40 is put on the protrusion 24 of the main body nut 20 and the intermediate member 30, and the auxiliary nut 40 is attached to the protrusion 24 of the main body nut 20. Specifically, after the auxiliary nut 40 is put on the protrusion 24 and the intermediate member 30 of the main body nut 20, the female of the hollow portion 42 is rotated counterclockwise (counterclockwise) in FIG. The male screw portion 24a of the protrusion 24 of the main body nut 20 is fitted into the screw portion 42b. Then, until the side surface 30a of the intermediate member 30 comes into contact with the tapered portion 42a of the auxiliary nut 40 inside the auxiliary nut 40 and no gap is formed between the side surface 30a of the intermediate member 30 and the tapered portion 42a of the auxiliary nut 40. The auxiliary nut 40 is tightened to the protrusion 24 of the main body nut 20. In this way, as shown in FIG. 12D, the auxiliary nut is attached to the first threaded portion 14 and the second threaded portion 16 of the LR bolt 10, respectively, with the main body nut 20 and the intermediate member 30 attached. The 40 covers the protrusion 24 of the main body nut 20 and the intermediate member 30. Further, when the intermediate member 30 is covered with the auxiliary nut 40, even if a force in a loosening direction is applied to the intermediate member 30 from the second screw portion 16 of the LR bolt 10, the intermediate member 30 is conical. The shape of the table prevents the intermediate member 30 from slipping out of the auxiliary nut 40.

In such a fastener, the first screw portion 14 and the second screw portion 16 of the LR bolt 10 have threads wound in opposite directions, and the first screw portion 14 and the first screw portion 14 of the LR bolt 10 and the screw portion 16 are wound in opposite directions. Since the protrusion 24 of the main body nut 20 has a thread wound in the opposite direction, the main body nut 20 and the intermediate member 30 are less likely to loosen from the LR bolt 10. More specifically, as a factor for the nut to loosen from the bolt, an impact is applied to the first member 100, the second member 102, etc., or an impact is applied to the nut or the bolt itself, so that the nut is subjected to an impact. It is conceivable that the nut will loosen from the bolt due to the force applied in the direction opposite to the direction in which the bolt is tightened. On the other hand, in the present embodiment, as described above, in the LR bolt 10, the first screw portion 14 and the second screw portion 16 have threads wound in opposite directions, and the first screw is used. A main body nut 20 and an intermediate member 30 are attached to the portion 14 and the second screw portion 16, respectively. Moreover, the auxiliary nut 40 is attached to the protrusion 24 of the main body nut 20 so that the auxiliary nut 40 covers the protrusion 24 of the main body nut 20 and the intermediate member 30. Therefore, an impact is applied to the first member 100, the second member 102, and the like, or an impact is applied to the LR bolt 10 and the main body nut 20 itself, so that the LR bolt 10 is attached to the main body nut 20. Even if a force in the loosening direction is applied from the first screw portion 14, the intermediate member 30 does not loosen from the second screw portion 16 of the LR bolt 10, so that the main body nut 20 is the first screw portion 14 of the LR bolt 10. It is prevented from loosening.

More specifically, in the present embodiment, the intermediate member 30 is attached to the second threaded portion 16 of the LR bolt 10, and the intermediate member 30 is covered with the auxiliary nut 40. Further, although the auxiliary nut 40 is attached to the protrusion 24 of the main body nut 20, the direction in which the auxiliary nut 40 is tightened to the protrusion 24 of the main body nut 20 and the main body nut 20 are the first screw portion 14 of the LR bolt 10. The direction of tightening is opposite. Therefore, when a force in the loosening direction is applied to the main body nut 20 from the first screw portion 14 of the LR bolt 10, even if a force in the same direction is applied to the auxiliary nut 40, for example, the direction of this force. Is oriented so that the auxiliary nut 40 is to be tightened to the protrusion 24 of the main body nut 20, so that the auxiliary nut 40 does not loosen from the protrusion 24 of the main body nut 20. Then, even if a force in the loosening direction is applied to the main body nut 20 from the first screw portion 14 of the LR bolt 10, the main body nut 20 is moved to the second member 102 side by the intermediate member 30 covered with the auxiliary nut 40. Since it is pressed down, it is possible to prevent the main body nut 20 from loosening from the first screw portion 14 of the LR bolt 10.

The fastening device of the present embodiment is not limited to the above configuration. As another example of the fastening device of the present embodiment, a male screw portion 14a of a left screw instead of a right screw is formed on the outer peripheral surface of the first screw portion 14 of the LR bolt 10, and the screw of the main body nut 20 is formed. A female threaded portion 26a into which the male threaded portion 14a of the left-handed screw is screwed may be formed on the inner peripheral surface of the hole 26. In this case, a male threaded portion 24a of a right-handed screw instead of a left-handed screw is formed on the outer peripheral surface of the protrusion 24 of the main body nut 20, and a right-handed screw is formed on the inner peripheral surface of the hollow portion 42 of the auxiliary nut 40. A female threaded portion 42b to which the male threaded portion 24a of the above is screwed is formed. Further, a male screw portion 16a of a right-handed screw is formed on the outer peripheral surface of the second threaded portion 16 of the LR bolt 10 instead of a left-handed screw, and a male screw of a right-handed screw is formed on the inner peripheral surface of the screw hole 32 of the intermediate member 30. A female screw portion 32a into which the portion 16a is screwed is formed. Even in such a fastening device, in the LR bolt 10, the first screw portion 14 and the second screw portion 16 have threads wound in opposite directions, and the first screw portion 14 and the first screw portion 14 of the LR bolt 10 and the screw portion 16 are wound in the opposite directions. Since the protrusion 24 of the main body nut 20 has a thread wound in the opposite direction, it is possible to prevent the main body nut 20 from loosening from the LR bolt 10.

Further, the intermediate member 30 is not limited to the shape of a truncated cone. As the intermediate member 30, a shape other than the shape of a truncated cone may be used as long as it has a shape that does not come out upward from the auxiliary nut 40 when covered with the auxiliary nut 40. As yet another example of the fastening device according to the present embodiment, a substantially cylindrical intermediate member 30 in which the screw hole 32 is formed may be used. When the intermediate member 30 having a substantially cylindrical shape is used, the auxiliary nut 40 is provided with a pull-out prevention member for preventing the intermediate member 30 from slipping upward from the hollow portion 42 of the auxiliary nut 40. Is preferable. Further, when the length of the second threaded portion 16 of the LR bolt 10 is relatively short, the hollow portion 42 penetrates the auxiliary nut 40 as long as it can cover the intermediate member 30 as the auxiliary nut 40. Those that have not been used may be used.

10 LR bolt 12 Head part 14 First threaded part 14a Male threaded part 16 Second threaded part 16a Male threaded part 20 Main body nut 22 Nut part 24 Projection part 24a Male threaded part 26 Screw hole 26a Female threaded part 30 Intermediate member 30a Side surface 32 Screw hole 32a Female screw part 40 Auxiliary nut 42 Hollow part 42a Tapered part 42b Female screw part 100 First member 102 Second member

Claims (7)

The head portion, a male screw portion provided so as to extend from the head portion and wound in the first direction, is provided so as to extend from the tip of the rod-shaped first screw portion and the first screw portion formed on the outer peripheral surface. A bolt having a rod-shaped second threaded portion having a male threaded portion wound on the outer peripheral surface formed in a second direction opposite to the direction of 1.
A female screw that has a nut portion and a male screw portion that protrudes from the nut portion and is wound in the second direction and has a protrusion formed on the outer peripheral surface, and the male screw portion of the first screw portion is screwed. A main body nut with a screw hole whose part is formed on the inner peripheral surface,
An intermediate member provided with a screw hole having a female screw portion formed on the inner peripheral surface of the second screw portion into which the male screw portion is screwed.
A hollow portion that covers the protrusion and the intermediate member of the main body nut and has a female screw portion formed on the inner peripheral surface to which the male screw portion formed on the outer peripheral surface of the protrusion of the main body nut is screwed. With the auxiliary nut that is formed,
A fastening device equipped with. The fastening device according to claim 1, wherein the diameter of the first threaded portion of the bolt is larger than the diameter of the second threaded portion. The inner peripheral surface of the hollow portion of the auxiliary nut covers the protrusion of the main body nut and the intermediate member, and when the auxiliary nut is attached to the protrusion of the main body nut, the intermediate member The fastening device according to claim 1 or 2, which is configured to come into contact with the outer peripheral surface. The fastening device according to any one of claims 1 to 3, wherein the intermediate member is in the shape of a truncated cone. The intermediate member is attached to the inner peripheral surface of the hollow portion of the auxiliary nut when the auxiliary nut is attached to the protrusion of the main body nut while covering the protrusion of the main body nut and the intermediate member. The fastening device according to claim 4, wherein a tapered portion is formed in contact with the side surface of the device. The female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is a screw portion of the male screw portion of the right-hand screw in the first screw portion of the bolt, and the intermediate member. The female screw portion formed on the inner peripheral surface of the screw hole of the bolt is screwed with the male screw portion of the left screw in the second screw portion of the bolt, and the hollow of the auxiliary nut. The female screw portion formed on the inner peripheral surface of the portion is one in which the male screw portion of the left screw in the protrusion portion of the main body nut is screwed, according to any one of claims 1 to 5. The fasteners described. The female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is a screw portion of the male screw portion of the left screw in the first screw portion of the bolt, and the intermediate member. The female screw portion formed on the inner peripheral surface of the screw hole is a screw portion of the male screw portion of the right-hand screw in the second screw portion of the bolt, and the hollow portion of the auxiliary nut. The female screw portion formed on the inner peripheral surface of the portion is one in which the male screw portion of the right-hand screw in the protrusion portion of the main body nut is screwed, according to any one of claims 1 to 5. The fasteners described.

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