JP6931470B2 - Bolts, fastening members using them, and fastening methods using them - Google Patents

Description

The present invention relates to a bolt, a fastening member using the bolt, and a fastening method using the bolt.

In recent years, various bolts having a slack prevention function and methods for manufacturing the same have been researched and developed.

In Patent Document 1, a slit for dividing the flanks on both sides of the screw thread is provided along the peak of the screw thread, and the vicinity of the valley bottom of the screw thread is formed as a wide-bottom recess having a shape scooped inward from the extension surface of the flank. Self-locking screws have been disclosed.

Further, in Patent Document 2, a flat thread is formed on the surface of a flat plate by horizontally developing right-hand threads and left-hand threads that intersect with each other, and a pair of flat plates facing each other in parallel with the surfaces facing inward. A columnar material is inserted between them, and at least one of the flat plates is moved while narrowing the pressure of the columnar material, and right and left screws intersecting each other on the outer peripheral surface of the columnar material are screwed. The method of rolling right and left screws is disclosed.

Japanese Unexamined Patent Publication No. 11-51033 Japanese Unexamined Patent Publication No. 11-254072

However, in the technique described in Patent Document 1, a slit is formed along the peak of the thread and the vicinity of the valley bottom of the thread is hollowed out, so that the thread is thinned and shear stress is applied. There is a problem that it lacks durability as well as chipping.

Further, the technique described in Patent Document 1 lacks compressive stress and has durability because the thread is always elastically deformed when the nut is fastened and the mechanical strength decreases with time. There is a problem that it lacks safety because it lacks.

On the other hand, the technique described in Patent Document 2 does not consider the relationship between the durability and strength of the screw portion and the synchrony of the screw thread caused by the difference in the pitch size of the right-hand thread and the left-hand thread.

For this reason, the valley of the other screw is randomly screwed to the screw thread of one screw, and there is a part where the screw thread is crushed, which is weak against compressive stress and shearing force, lacks durability, and reduces the fastening force. ..

In addition, the synchronization of the manufactured right- and left-handed screw threads is lost, there are many divided parts of the screw threads, the mechanical strength is lowered, and it is difficult to visually detect defects in the product.

If the lead angle of the screw portion screwed to the first nut mounted first on the bolt is smaller than the lead angle of the screw portion screwed to the second nut mounted later, the rotation is performed at the same angle. On the other hand, since the moving distance of the second nut is larger than the moving distance of the first nut, there is a problem that it is easily loosened, lacks fastening force, and lacks safety.

An object of the present invention is to provide a fastening member that is hard to loosen.

Another object of the present invention is to provide a method for fastening a bolt that is hard to loosen.

The bolt according to the first aspect of the present invention is a bolt in which a spiral thread for screwing a nut is formed by the difference between the inner diameter and the outer diameter.
The bolt
The head of the bolt that rotates the bolt and
A bolt body, in which the spiral thread is formed and a nut can be screwed in, is provided.
A bolt in which the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter are different.

In the case of bolts whose inner diameter center point and outer diameter center point are different, there are nuts that rotate around the inner diameter center point as a rotation axis and nuts that rotate around the outer diameter center point as a rotation axis.

Therefore, by screwing the nuts into the bolts using both of these nuts, it is possible to fasten the nuts so that they do not loosen easily.

The bolt according to the second aspect of the present invention is the bolt according to the first aspect, and is spiral due to the displacement between the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter. A bolt whose thread height changes.

By making the center point of the inner diameter different from the center point of the outer diameter, the height of the spiral screw thread changes, and a high thread portion and a low screw thread portion occur.

Then, there are nuts that rotate with the center point of the inner diameter as the rotation axis and nuts that rotate with the center point of the outer diameter as the rotation axis. be able to.

The fastening member according to the third aspect includes a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, and the nut screwed into the bolt. Is a fastening member that includes
The head of the bolt that rotates the bolt and
A bolt body in which the spiral thread is formed and a nut can be screwed is provided, and a bolt having an inner diameter center point of the inner diameter and an outer diameter center point of the outer diameter different from each other.
A first nut screwed into the bolt with the center point of the inner diameter of the bolt as the rotation axis,
Includes a second nut that is screwed into the bolt with the center point of the outer diameter of the bolt as the axis of rotation.
Fastening where the distance between the first nut and the inner diameter of the bolt and the distance between the second nut and the outer diameter are shorter than the distance between the inner diameter center point and the outer diameter center point, respectively. It is a member.

By screwing both the first nut, which is screwed into the bolt with the inner diameter center point as the rotation axis, and the second nut, which is screwed into the bolt with the outer diameter center point as the rotation axis, into the bolt, the first nut and the first nut are used. By bringing the two nuts into close contact with each other, the first nut and the second nut are less likely to rotate at the same time due to the difference in the rotation shaft, and the nuts are less likely to loosen.

The total of the distance between the first nut and the inner diameter of the bolt and the distance between the second nut and the outer diameter is the distance between the inner diameter center point and the outer diameter center point. Shorter ones are preferred.

The fastening member according to the fourth aspect of the present invention includes a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, and the bolt screwed to the bolt. A fastening member including a nut and a cap fitted to the nut.
The head of the bolt that rotates the bolt and
A bolt body in which the spiral thread is formed and a nut can be screwed is provided, and a bolt having an inner diameter center point of the inner diameter and an outer diameter center point of the outer diameter different from each other.
A nut having a fixed portion that is screwed into the bolt with the center point of the inner diameter of the bolt as a rotation axis and fixed to the cap.
A cap having a through hole having a center point of the outer diameter into which the bolt body can be inserted and having a fixing portion having a center point of the inner diameter as the center of the inner diameter covering at least a part of the fixed portion of the nut. Including
The distance between the nut and the inner diameter of the bolt, the distance between the through hole of the cap and the outer diameter of the bolt, and the distance between the fixed portion and the fixed portion are , Each is a fastening member shorter than the distance between the inner diameter center point and the outer diameter center point.

Since the central axis of the through hole of the cap (the center of the circle in xy plan view) is the center point of the outer diameter, the rotation axis of the nut and the central axis of the cap are different because the cap covers at least a part of the nut. , The nut and cap cannot rotate at the same time, the nut is fixed to the bolt.

Therefore, the nut is hard to loosen with respect to the bolt even if the cap is attached.

The distance between the nut and the inner diameter of the bolt, the distance between the through hole of the cap and the outer diameter of the bolt, and the gap between the fixed portion and the fixed portion. The total distance is preferably shorter than the distance between the inner diameter center point and the outer diameter center point.

The fastening member according to the fifth aspect of the present invention includes a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, and the bolt screwed to the bolt. A fastening member including a nut and a cap fitted to the nut.
The head of the bolt that rotates the bolt and
A bolt body, in which the spiral thread is formed and a nut can be screwed in, is provided.
Bolts in which the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter are different,
A nut screwed into the bolt with the center point of the inner diameter of the bolt as the rotation axis,
A cap that can be inserted from the side into the bolt body, has an insertion port having an outer diameter center point that holds the bolt body as a center, and has a side surface that holds the side surface of the nut. Including
The distance between the nut and the inner diameter of the bolt, the distance between the insertion port of the cap and the outer diameter of the bolt, and the distance between the side surface portion and the nut are, respectively. It is a fastening member shorter than the distance between the inner diameter center point and the outer diameter center point.

The central axis of the cap insertion port (the center of the circle in xy plan view) is the center point of the outer diameter, and since the cap covers at least a part of the nut, the rotation axis of the nut and the central axis of the cap are different. The nut and cap cannot rotate at the same time and the nut is fixed to the bolt.

Therefore, the nut is hard to loosen with respect to the bolt even if the cap is attached.

The distance between the inner diameter of the nut and the inner diameter of the bolt, the distance between the insertion port of the cap and the outer diameter of the bolt, and the distance between the side surface portion and the nut. The total is preferably shorter than the distance between the inner diameter center point and the outer diameter center point.

The fastening member according to the sixth aspect of the present invention is a fastening member including a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter.
A bolt head for rotating the bolt and a bolt body having a spiral thread formed and screwable to a female screw are provided, and the inner diameter center point of the inner diameter and the outer diameter center of the outer diameter are provided. Bolts with different points and
A screw hole provided with the female screw for rotating the bolt around the inner diameter center point as a rotation axis, and a circular insertion portion having the same center point in a plan view as the screw hole are provided. Includes an insertion member to be inserted into the inserted portion of the female screw member.
The insertion member includes a through hole into which the bolt head or the bolt body can be inserted, with the center point at a position separated from the center point by the distance between the inner diameter center point and the outer diameter center point.
The distance between the female screw and the inner diameter of the bolt, the distance between the through hole of the insertion member and the outer diameter of the bolt, and the gap between the insertion member and the inserted portion. A fastening member whose distance is shorter than the distance between the inner diameter center point and the outer diameter center point, respectively.

The "female screw member" includes, for example, a wall, a board, a plate, or the like, and is a place where a female screw for inserting a bolt is provided.

Since the bolt rotates with respect to the female screw with the inner diameter center point in the plan view as the rotation axis, by holding the outer diameter of the bolt with the insertion member, the bolt whose inner diameter center point and outer diameter center point are different cannot rotate. , The bolt is fixed.

The fastening method according to the seventh aspect of the present invention is a fastening method using the bolt, the first nut and the second nut according to the third aspect.
This is a fastening method including a fixing step in which the relative positions of the first nut and the second nut screwed into the bolt in the vertical direction with respect to the respective rotation axes are fixed.

The "direction perpendicular to the rotation axis" is the xy plane direction (x-axis direction and y-axis direction) in the present embodiment.

For a bolt whose inner diameter center point and outer diameter center point are different, a first nut that rotates around the inner diameter center point as a rotation axis is screwed into the bolt.
After that, the second nut that rotates around the center point of the outer diameter is screwed into the bolt.
By fixing the relative positions of the first nut and the second nut in the direction perpendicular to the rotation axis (x-axis direction, y-axis direction) with the fixing member, it is possible to obtain the effect that the nut is hard to loosen with respect to the bolt.

The plan view of the 1st bolt in one Embodiment which concerns on this invention. The side view of the 1st bolt in one Embodiment which concerns on this invention. AA side view sectional view of a bolt in a state where a nut is attached according to the embodiment of the present invention. A cross-sectional view of a first nut according to an embodiment of the present invention. A cross-sectional view of a second nut according to an embodiment of the present invention. The conceptual diagram concerning the attachment of the fixing member in one Embodiment which concerns on this invention. AA and BB side view sectional views of a bolt in a state where a nut is attached according to the embodiment of the present invention. The conceptual diagram of the 3rd nut and the 1st cap in one Embodiment which concerns on this invention. The conceptual diagram of the 1st nut and the 2nd cap in one Embodiment which concerns on this invention. AA and CC side sectional views of bolts with the first nut and the second cap attached in one embodiment according to the present invention. The conceptual diagram in which the 2nd bolt in one Embodiment which concerns on this invention is attached to a female screw member. The conceptual diagram in which the 2nd bolt in one Embodiment which concerns on this invention is attached to a female screw member. The conceptual diagram in which the 2nd bolt in one Embodiment which concerns on this invention is attached to a female screw member. The flowchart of the fastening method by a bolt in one Embodiment which concerns on this invention. The flowchart of the fastening method by a bolt in one Embodiment which concerns on this invention.

Hereinafter, embodiments of the first bolt 100 and the nut 200, which are the bolts of the fastening member according to the present invention, will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the first bolt 100 includes a bolt head 110 for rotating the first bolt 100 and a bolt head 110.
It includes a bolt body 120 in which a spiral groove is formed.

The bolt head 110 in this embodiment has a hexagonal shape in xy plan view. The size is not particularly limited.

The center point of the bolt head 110 in the xy plan view is the same as the outer diameter center point C2 of the bolt body 120.

The bolt head 110 may have any shape as long as the first bolt 100 can rotate on its axis, and may have a shape other than the hexagon in xy plan view. Further, for example, a hexagonal hole into which a hexagonal bar spanner can be inserted may be formed.

Further, the bolt head 110 may have a shape such as a square hole, plus or minus, S type, H type (Philipis type), Z type (cross hole), or a slipper, in addition to the hexagonal hole.

The bolt head 110 may have any shape in the yz plan view and the xz plan view.

For example, the yz plan view and the xz plan view of the bolt head 110 may be in the shape of a pan, a truss, a bind, an upset, a plate, a round plate, or the like.

In the present embodiment, the bolt head 110 is a hexagon in the xy plan view centered on the outer diameter center point C2 in the xy plan view, but may have a shape centered on the inner diameter center point C1.

By setting the center point of the bolt head 110 in the xy plane view as the outer diameter center point C2, the bolt head 100 is arranged at the center of the bolt body 120 in the yz plane view or the xz plane view of the first bolt 100, so that the appearance is external. Is beautiful.

The bolt body 120 has an inner diameter 131 constituting the inner diameter of the screw thread 130 and an inner diameter 131.
It has an outer diameter 132 that constitutes the outer diameter of the screw thread 130.

The inner diameter 131 is a circle centered on the inner diameter center point C1 in the xy plan view.

The outer diameter 132 is a circle centered on the outer diameter center point C2 in the xy plan view.

The outer diameter 132 is a circle having a diameter larger than the inner diameter 131 in the xy plan view.

In xy plan view, the inner diameter center point C1 of the inner diameter 131 and the outer diameter center point C2 of the outer diameter 132 are not the same.

Therefore, the bolt body 120 has the shortest distance m1 and the longest distance m2 between the inner diameter 131 and the outer diameter 132 in the xy plan view.

That is, the height of the lowest peak of the screw thread 130 of the bolt body 120 is the shortest distance m1, and the height of the highest peak is the longest distance m2.

<First Embodiment>
The nut 200 includes a bolt body 120 of the first bolt 100, a first nut 210 that rotates and screwes around an inner diameter center point C1.
Includes a second nut 220 that rotates and screwed around the outer diameter center point C2.

As shown in FIGS. 3 and 4, the first thread groove 211 of the first nut 210 is the depth at which the thread 130 having the longest distance m2, which is the height of the highest thread of the thread 130, is screwed. ..

As shown in FIG. 4, the first inner diameter L1 of the first nut 210 is a size to be screwed in accordance with the inner diameter 131 of the first bolt 100.

Specifically, the gap between the first inner diameter L1 of the first nut 210 and the inner diameter 131 of the first bolt 100 in xy plan view is smaller than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Therefore, the first nut 210 rotates and screwes with the bolt body 120 of the first bolt 100 about the inner diameter center point C1.

The second thread groove 221 of the second nut 220 is the depth at which the thread 130 having the shortest distance m1, which is the height of the lowest thread of the thread 130, is screwed.

As shown in FIG. 5, the second inner diameter L2 of the second nut 220 has a size of being screwed in accordance with the outer diameter 132 of the first bolt 100.

Specifically, the gap between the second inner diameter L2 of the second nut 220 and the outer diameter 132 of the first bolt 100 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Therefore, the second nut 220 rotates and is screwed with the bolt body 120 of the first bolt 100 about the outer diameter center point C2.

Since the rotation shafts of the first nut 210 and the second nut 220 are not the same, when the first nut 210 and the second nut 220 are in close contact with each other, they cannot rotate at the same time.

Specifically, the gap between the first inner diameter L1 of the first nut 210 and the inner diameter 131 of the first bolt 100 in xy plan view is smaller than the distance d between the inner diameter center point C1 and the outer diameter center point C2, and The gap between the second inner diameter L2 of the second nut 220 and the outer diameter 132 of the first bolt 100 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Therefore, the rotation axes of the first nut 210 and the second nut 220 do not match, and when the first nut 210 and the second nut 220 are in close contact with each other, they cannot rotate at the same time.

Therefore, by screwing both the first nut 210 and the second nut 220 and the first bolt 100, the nut 200 is less likely to loosen from the first bolt 100.

Further, as shown in FIG. 6, by fixing the first nut 210 and the second nut 220 with the fixing member 300, the first nut 210 and the second nut 220 can rotate only at the same time. Since the rotation shafts of the 1st nut 210 and the 2nd nut 220 are not the same, they cannot rotate at the same time.

That is, the relative positions of the first nut 210 and the second nut 220 on the xy plane are fixed by the fixing member 300.

Therefore, it is possible to prevent the first nut 210 and the second nut 220 from loosening with respect to the first bolt 100.

As shown in FIG. 6, as an example of the fixing member 300, for example, a U-shaped member in a xy plan view can be mentioned.

By fitting the fixing member 300 into the first nut 210 and the second nut 220, it is possible to prevent the first nut 210 and the second nut 220 from loosening with respect to the first bolt 100.

The first nut 210 and the second nut 220 may be reversed. That is, the second nut 220 may be passed through the first bolt 100 before the first nut 210. Even in such a case, the same effect as described above is obtained.

Further, in the present embodiment, a U-shaped xy plan view is given as an example of the fixing member 300, but when the second nut 220 is screwed so as to come into contact with the first nut 210, it becomes the first nut 210. The side surface with the second nut 220 may not be parallel.

When the first nut 210 and the second nut 220 are screwed into contact with each other, the hexagonal apex of the first nut 210 and the second nut 220 in the xy plan view is the inner diameter center point C1 and the outer diameter center point C2. When it is in a straight line with, the fixing member 300 having a U-shape in xy plan view can be attached.

If the first nut 210 and the second nut 220 have a shape like the third nut 230 described later, the first nut 210 may be a U-shaped fixing member 300 in an xy plane view at some angle on the xy plane. And can be inserted into the second nut 220 from the side.

<Second Embodiment>
In the second embodiment, the third nut 230, which is a nut, is used instead of the first nut 210 of the first embodiment, and the first cap 250, which is a cap, is used instead of the second nut 220. .. The first bolt 100 has the same configuration as that of the first embodiment, and the same or similar configuration as that of the first embodiment will be omitted or briefly described.

As shown in FIGS. 7 and 8, the third nut 230 includes a circular fixed portion 232 in an xy plan view.

In the present embodiment, the fixed portion 232 is arranged at the end portion of the third nut 230 on the positive side in the z-axis direction, but the position thereof is not limited.

Similar to the first nut 210, the third nut 230 is screwed into the third thread groove 231 of the third nut 230 with the thread 130 having the longest distance m2, which is the height of the highest thread of the thread 130. Depth.

That is, the third nut 230 is screwed into the bolt body 120 with the inner diameter center point C1 as the rotation axis.

Specifically, the gap between the inner diameter of the third nut 230 and the inner diameter 131 of the first bolt 100 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

As shown in FIG. 8, the first cap 250, which is the cap of the present embodiment, includes a first through hole 251 which is a through hole into which the bolt body 120 can be inserted in the z-axis direction.
A fixing portion 252 for fixing the fixed portion 232 of the third nut 230 is provided.

The central axis (center of circle on the xy plane) of the first through hole 251 of the first cap 250 that penetrates the bolt body 120 of the first bolt 100 is the outer diameter center point C2.

On the other hand, the inner diameter of the inner diameter of the fixing portion 252 of the first cap 250 has the inner diameter center point C1 as the central axis (the center of the circle on the xy plane).

That is, the rotation shaft (center shaft) inside the fixing portion 252 of the third nut 230 and the first cap 250 is the inner diameter center point C1, while the center shaft inside the first through hole 251 of the first cap 250 (center shaft). The center of the circle on the xy plane) is the outer diameter center point C2.

Therefore, by fitting the first cap 250 into the third nut 230, the central axis inside the fixing portion 252 of the first cap 250 is the inner diameter center point C1, while the first through hole 251 of the first cap 250 Since the inner central axis is the outer diameter center point C2, the first cap 250 itself cannot rotate.

Since the first through hole 251 of the first cap 250 is not provided with a female screw, it can be directly inserted into the bolt body 120 of the first bolt 100.

The first cap 250 is rotated (rotated) by the bolt body 120, and the fixing portion 252 is inserted into the fixed portion 232 at a position corresponding to the fixed portion 252 and the fixed portion 232 of the third nut 230.

Specifically, the rotation axis of the inner diameter center point C1 of the bolt body 120 and the center axis of the fixing portion 252 of the cap 250 coincide with each other, and the rotation axis of the outer diameter center point C2 of the bolt body 120 and the first cap 250. The fixing portion 252 can be inserted into the fixed portion 232 at a position where the central axes of the through holes 251 coincide with each other.

Similar to the first embodiment, the gap between the inner diameter of the third nut 230 and the inner diameter 131 of the first bolt 100 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Further, the gap between the inside of the first through hole 251 of the first cap 250 and the outer diameter 132 of the first bolt 100 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Further, the gap between the inside of the fixed portion 252 of the first cap 250 and the fixed portion 232 of the third nut 230 in xy plan view is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Then, the gap between the inner diameter of the third nut 230 and the inner diameter 131 of the first bolt 100 in xy plan view, the inside of the first through hole 251 of the first cap 250, and the outer diameter 132 of the first bolt 100 The total of the gap in the xy plane view and the gap in the xy plane view between the inside of the fixing portion 252 of the first cap 250 and the fixed portion 232 of the third nut 230 is shorter than the distance d.

Therefore, even in this case, the relative positions of the third nut 230 and the first cap 250 on the xy plane are fixed by connecting the fixed portion 232 and the fixed portion 252.

Specifically, the rotation axis of the third nut 230 is the inner diameter center point C1, and the center axis (rotation axis) of the first through hole 251 of the first cap 250 is the outer diameter center point C2. The shaft is different, and by fixing the fixed portion 232 with the fixing portion 252 of the first cap 250, the third nut 230 cannot rotate.

Further, when a force for rotating the cap 250 is applied to the third nut 230 after the cap 250 is attached to the third nut 230, the cap 250 rotates by the tolerance (gap / error). However, a force that pulls in the xy plane direction is applied due to the difference in the rotation axis between the inner diameter center point C1 and the outer diameter center point C2.

As a result, a force is applied to the inner diameter 131 of the bolt body 120 of the first bolt 100 and the thread groove and thread of the third nut 230, and the cap 250 and the third nut 230 are fixed with a stronger tension.

Therefore, the third nut 230 is hard to loosen with respect to the first bolt 100. Further, the first cap 250 is also hard to loosen with respect to the first bolt 100.

The fixed portion 232 is fixed by the fixed portion 252, but the contact area with the fixed portion 252 should be large so that the fixed portion 232 can be easily fixed to the fixed portion 252.

Therefore, when the fixed portion 252 has a circular shape in the xy plane view, the fixed portion 232 also preferably has a circular shape in the xy plane view.

The arrangement of the first cap 250 and the third nut 230 may be reversed.

Further, a claw portion (not shown) for hooking the third nut 230 may be provided on the opening side (z-axis positive direction side) of the first cap 250.

With such a configuration, the first cap 250 is less likely to come off from the third nut 230, and the loosening of the first bolt 100 due to the unexpected removal of the first cap 250 can be prevented.

<Third Embodiment>
The third embodiment has a configuration in which the second cap 260, which is a cap, is fitted to the first bolt 100 from the side. The first bolt 100 has the same configuration as that of the first embodiment, and the same or similar configuration as that of the first embodiment and the second embodiment will be omitted or briefly described.

As shown in FIGS. 9 and 10, the second cap 260 includes a first side surface portion 261 which is a side surface portion that covers at least a part of the side surface of the first nut 210.
It has a first upper surface portion 262 which is arranged on the upper portion of the first side surface portion 261 and is an upper surface portion which is fitted to the side surface of the bolt body 120.

The first side surface portion 261 in the present embodiment has a U-shape in a xy plan view and has a structure that covers a part of the side surface of the first nut 210 having the inner diameter center point C1 as the rotation axis.

Specifically, in the present embodiment, the first nut 210 is a hexagon nut, and the first side surface portion 261 holds the side surface of the first nut 210 parallel to the xz plane.

The second cap 260 may be configured to hold the corner portion which is the side surface of the first nut 210.

The x-axis positive direction side, which is a part of the first side surface portion 261 is open, and the second cap 260 can be inserted from the side surface side of the first nut 210.

The first upper surface portion 262 is arranged above the first side surface portion 261 and has a first insertion port 263 having a U-shape in an xy plan view so that the first upper surface portion 262 can be inserted from the side surface with respect to the bolt body 120.

The first insertion port 263 is open on the positive direction side of the x-axis, and the side surface of the bolt body 120 is held by inserting the second cap 260 into the bolt body 120 from the side.

Specifically, the first insertion port 263 of the second cap 260 holds a semicircular portion on the negative direction side of the x-axis in the xy plan view.

That is, the first insertion port 263 has the outer diameter center point C2 as the central axis in the yz plan view.

In other words, the first insertion port 263 of the second cap 260 has an outer diameter center point C2 as a rotation axis with respect to the bolt body 120.

On the other hand, the first side surface portion 261 (inner side surface) of the second cap 260 covers at least a part of the first nut 210, and the inner diameter center point C1 is set as the central axis (rotation axis).

Therefore, when the second cap 260 is inserted into the first bolt 100, the rotation axis of the first side surface portion 261 of the first nut 210 and the second cap 260 is the inner diameter center point C1, and the first insertion of the second cap 260. The axis of rotation of the mouth 263 is the outer diameter center point C2.

The distance between the first insertion port 263 and the bolt body 120 is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Therefore, when the second cap 260 is fitted to the first bolt 100, the central axis of the first insertion port 263 of the second cap 260 is the outer diameter center point C2, while the central axis of the first side surface portion 261 is the inner diameter. Since it is the center point C1, the second cap 260 cannot rotate.

In other words, when the second cap 260 is fitted to the first bolt 100, the rotation axes of the second cap 260 and the first nut 210 are different and cannot rotate at the same time, and the first nut 210 is attached to the bolt 120. It becomes difficult to rotate.

The distance between the first side surface portion 261 of the second cap 260 and the first nut 210 is shorter than the distance d between the inner diameter center point C1 and the outer diameter center point C2.

Further, in the present embodiment, the first insertion port 263 of the second cap 260 is arranged above the second cap 260 (on the z-axis positive direction side), but is arranged below (z-axis negative direction side). You may.

In this embodiment, the first nut 210 is used, but the third nut 230 may be used.

Unlike the first nut 210, the third nut 230 has a circular fixed portion 232, and therefore has an advantage that it can be easily fixed by the second cap 260.

That is, in the case of the third nut 230, since the fixed portion 232 has an xy plan view circular shape, the area in contact with the second cap 260 is wider than that of the first nut 210, and the second cap 260 stabilizes the area. It is fixed.

<Fourth Embodiment>
The fourth embodiment has a configuration in which a bolt 400 is screwed into a screw hole 500 in which a female screw is provided on a wall, a plate, or the like (female screw member 700). The same or similar configurations as those of the first embodiment, the second embodiment, and the third embodiment will be omitted or briefly described.

As shown in FIG. 11, the second bolt 400, which is a bolt, has a second bolt head 410 and a second bolt main body 420, similarly to the first bolt 100.

The second bolt head 410 has the same or substantially the same size as the second bolt main body 420 in xy plan view.

In the present embodiment, a hexagonal hole 411 for inserting a hexagon wrench is provided on the upper surface of the second bolt head 410 on the positive direction side of the z-axis.

In the present embodiment, the hexagonal hole 411 is provided in the second bolt head 410, but the hole may have any shape as long as it is for rotating the second bolt 400.

The hexagonal hole 411 is provided so as to rotate around the inner diameter center point C1 in the xy plan view.

As shown in FIG. 11, a female screw hole 500 is provided on a wall, a plate, or the like.

In the present embodiment, the screw hole 500 has a depth at which a screw thread having a maximum distance of m2, which is the height of the highest thread of the screw thread of the second bolt 400, is screwed into the screw hole 500, similarly to the first nut 210. ..

Therefore, the second bolt 400 rotates around the inner diameter center point C1 and is screwed with respect to the screw hole 500 in xy plan view.

Around the screw hole 500, an inserted portion 510 having a circular xy plan view is provided.

The center point of the xy plan view of the inserted portion 510 is the same as the center point of the xy plan view of the screw hole 500.

As shown in FIG. 12, the insertion member 600 is inserted into the second bolt 400 in a state of being screwed into the screw hole 500 from the positive direction side of the z-axis.

The insertion member 600 has a circular shape in a xy plan view, and is a member to be inserted into the inserted portion 510 provided on a wall, a plate, or the like.

The insertion member 600 has a second through hole 610 which is a through hole for passing the second bolt 400 through.

The second through hole 610 is a through hole for penetrating the second bolt head 410 or the second bolt main body 420.

The center point in the xy plan view of the second through hole 610 is separated from the center point (inner diameter center point C1) in the xy plan view of the insertion member 600 by the distance d between the inner diameter center point C1 and the outer diameter center point C2. ..

On the other hand, the center point of the outer peripheral circle of the insertion member 600 in xy plane view is the inner diameter center point C1 because it is inserted into the inserted portion 510.

Then, the second bolt 400 rotates about the inner diameter center point C1 in the xy plan view.

Therefore, the second bolt 400 and the insertion member 600 have different rotation axes and cannot rotate at the same time, so that the second bolt 400 is firmly fixed.

The distance between the screw hole 500 of the female screw and the inner diameter of the second bolt 400, the distance between the second through hole 610 of the insertion member 600 and the outer diameter of the second bolt 400, and the insertion member. The distance between the gap between 600 and the inserted portion 510 is shorter than the distance d between the inner diameter center point and the outer diameter center point, respectively.

Further, in the present embodiment, the second bolt head 410 has the same or substantially the same size as the second bolt body 420 in the xy plan view, but the second bolt head 410 has the second bolt in the xy plan view. It may be smaller than the main body 420.

Even in such a case, the second through hole 610 of the insertion member 600 has a shape in which the second bolt head 410 is fitted with a slight gap, so that the rotation of the second bolt 400 can be prevented. ..

Further, in the present embodiment, the second through hole 610 is configured to hold the second bolt head 410, but may hold the second bolt main body 420.

That is, the second through hole 610 may have a shape that fits into the second bolt body 420 with a slight gap.

Even in such a case, the rotation of the second bolt 400 can be prevented.

(Fastening method with 1st bolt 100, 1st nut 210 and 2nd nut 220)
As shown in the flowchart of FIG. 12, the inner diameter of the screw thread is formed in the bolt body 120 of the first bolt 100 with the inner diameter center point C1 displaced from the outer diameter center point C2 as the center, and the outer diameter center point C2. The outer diameter of the screw thread is formed around.

The first nut 210 having the inner diameter center point C1 as the rotation axis is screwed into the first bolt 100 (step 11, first nut screwing step).

Next, the second nut 220 having the outer diameter center point C2 as the rotation axis is screwed into the first bolt 100 (step S12, second nut screwing step).

Next, the first nut 210 and the second nut 220 are fixed by the fixing member 300 at a relative position in the direction perpendicular to the rotation axis (step S13, fixing step).

As a result, the first nut 210 and the second nut 220 are less likely to loosen with respect to the first bolt 100 (step S14).

(Fastening method with 1st bolt 100, 3rd nut 230 and 1st cap 250)
As shown in the flowchart of FIG. 13, the third nut 230 having the inner diameter center point C1 as the rotation axis is screwed into the first bolt 100 (step S21, nut screwing step).

Next, the first cap 250 having the first through hole 251 with the outer diameter center point C2 as the central axis is fitted into the first bolt 100 (step S22, cap fitting step).

Next, the xy plan view circular fixing portion 252 of the first cap 250 is fitted into the xy plan view circular fixed portion 232 of the third nut 230 with the inner diameter center point C1 as the central axis. The relative positions of the three nuts 230 and the first cap 250 in the direction perpendicular to the rotation axis are fixed (step S23, fixing step).

As a result, the third nut 230 and the first cap 250 are less likely to loosen with respect to the first bolt 100 (step S24).

The present invention can also be carried out in a mode in which various improvements, modifications, or modifications are added without departing from the spirit of the present invention.

100 ... 1st bolt 110 ... Bolt head 120 ... Bolt body 130 ... Screw thread 200 ... Nut 210 ... 1st nut 220 ... 2nd nut 230 ... 3rd nut 232 ... Fixed part 250 ... 1st cap 252 ... Fixed part 260 ... 2nd cap 261 ... 1st side surface part 263 ... 1st insertion port 300 ... Fixing member 400 ... 2nd bolt 411 ... Hexagonal hole 500 ... Screw hole 510 ... Inserted part 600 ... Inserting member 700 ... Female screw member

Claims (5)

A bolt in which a spiral thread for screwing a nut is formed by the difference between the inner diameter and the outer diameter.
The bolt
The head of the bolt that rotates the bolt and
A bolt body, in which the spiral thread is formed and a nut can be screwed in, is provided.
A bolt in which the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter are different. The bolt according to claim 1, wherein the height of the spiral thread is changed by shifting the position between the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter. A fastening member including a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, and the nut screwed to the bolt.
It is provided with a bolt head for rotating the bolt and a bolt body in which the spiral thread is formed and a nut can be screwed, and the inner diameter center point of the inner diameter and the outer diameter center point of the outer diameter are different. Bolt and
A first nut screwed into the bolt with the center point of the inner diameter of the bolt as the rotation axis,
Includes a second nut that is screwed into the bolt with the center point of the outer diameter of the bolt as the axis of rotation.
The distance between the first nut and the inner diameter of the bolt and the distance between the second nut and the outer diameter of the bolt are the distances between the inner diameter center point and the outer diameter center point, respectively. Shorter fastening member. Includes a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, the nut screwed to the bolt, and a cap fitted to the nut. Fastening member
The head of the bolt that rotates the bolt and
A bolt body in which the spiral thread is formed and a nut can be screwed is provided, and a bolt having an inner diameter center point of the inner diameter and an outer diameter center point of the outer diameter different from each other.
A nut having a fixed portion that is screwed into the bolt with the center point of the inner diameter of the bolt as a rotation axis and fixed to the cap.
A cap having a through hole having a center point of the outer diameter into which the bolt body can be inserted and having a fixing portion having a center point of the inner diameter as the center of the inner diameter covering at least a part of the fixed portion of the nut. Including
The distance between the nut and the inner diameter of the bolt, the distance between the through hole of the cap and the outer diameter of the bolt, and the distance between the fixed portion and the fixed portion are , Each fastening member shorter than the distance between the inner diameter center point and the outer diameter center point. Includes a bolt in which a spiral thread for screwing a nut is formed by a difference between an inner diameter and an outer diameter, the nut screwed to the bolt, and a cap fitted to the nut. Fastening member
The head of the bolt that rotates the bolt and
A bolt body in which the spiral thread is formed and a nut can be screwed is provided, and a bolt having an inner diameter center point of the inner diameter and an outer diameter center point of the outer diameter different from each other.
A nut screwed into the bolt with the center point of the inner diameter of the bolt as the rotation axis,
A cap that can be inserted from the side into the bolt body, has an insertion port having an outer diameter center point that holds the bolt body as a center, and has a side surface that holds the side surface of the nut. Including
The distance between the nut and the inner diameter of the bolt, the distance between the insertion port of the cap and the outer diameter of the bolt, and the distance between the side surface portion and the nut are, respectively. A fastening member shorter than the distance between the inner diameter center point and the outer diameter center point.

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