JP2001317527A - Whirl-stop mechanism of rotary fastening tool, first and second washers used for it, and mechanism releasing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily stop whirl without requiring a skill, reuse a bolt and nut even after disassembling (release of the whirl stop), and prevent easy disassembling by an illegal third party. SOLUTION: This whirl-stop mechanism is applied to a plurality of adjacent rotary fastening tools, and comprises a first washer 16 that engages with shaft parts of the plurality of fastening tools and is provided not to rotate in relation to a fastened member 14 and second washers 18 and 20 provided, not to rotate in relation to the plurality of fastening tools. The first washer 16 is joined to the second washers 18 and 20, thereby stopping the whirl of the plurality of fastening tools in relation to the fastened member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation / locking mechanism for a rotary fastener such as a bolt / nut mechanism.

[0002]

2. Description of the Related Art Fasteners such as bolts and nuts used in bogies for railway vehicles, aircraft, plants and the like are used for:
If it loosens itself, it can be a big problem. Therefore, the rotation is conventionally stopped by various methods. For example, in the device shown in Japanese Utility Model Laid-Open Publication No. 60-18320, the thread itself is deformed. In addition, 60
In the invention shown in -18322, the bolt or the nut itself is joined. In addition, actual opening 59-152
In the invention shown at 212, the locking cap is fixed to the base material. Still other methods include drilling a hole in the nut and screw shaft and passing a cotter pin, connecting adjacent nuts with wire, or using a bent washer to
The nut was stopped from rotating.

[0003]

However, the method of fixing the bolt or the nut itself by welding has a disadvantage that the screw cannot be reused. Further, according to the method of passing a split pin through a nut and a screw shaft, it is difficult to align the holes when retightening after loosening. The method of connecting adjacent nuts with a wire has a problem that the locking effect is small. In addition, according to the method using the bending washer, there is a problem that a special skill of bending the washer with respect to the nut without any gap is required. In the method of deforming the screw portion or the method of fixing the locking cap to the base material, it is difficult to loosen the screw at the time of disassembly. Furthermore, in the method using the bending washer,
There is also a problem that a third party can easily loosen bolts and nuts of important parts intentionally.

[0004] The present invention has been made in view of the above situation, and has as its object to provide a mechanism capable of easily stopping rotation without requiring skill.

[0005] Another object of the present invention is to provide a mechanism capable of reusing bolts and nuts even after disassembly (unlocking the rotation) and preventing easy disassembly by an unauthorized third party. It is in.

[0006]

In order to solve the above-mentioned problems, a rotation preventing mechanism according to the present invention is engaged with the shafts of a plurality of rotary fasteners adjacent to each other, and is provided with a member to be tightened (14). ) And a second washer (18, 20) provided so as not to rotate with respect to the plurality of fasteners.
Then, the first and second washers (16, 18, 20) are joined to prevent the plurality of fasteners from rotating with respect to the member to be tightened (14).

Another invention of the present application relates to a first and a second washer (16,
18, 20).

[0008] Still another aspect of the present invention relates to a detent mechanism as described above, wherein the first and second washers (16, 18, 20) are provided.
A method of releasing a rotation preventing mechanism for releasing a rotation stopping by cutting a joint portion (40) of the present invention.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to an example in which a hexagon bolt head is prevented from rotating.
In addition, the present invention can also be applied to a detent of a hexagon nut,
Further, it goes without saying that the present invention can be applied to a square bolt / nut tightening tool. That is, the present invention can be applied to various types of rotary fasteners within the scope of the technical idea described in the claims.

FIG. 1 shows a use state of a rotation preventing mechanism according to a first embodiment of the present invention. FIG. 2 is a plan view of the rotation preventing mechanism according to the present embodiment, and FIG. 3 shows a configuration of a first washer (16) used for the rotation preventing mechanism. The anti-rotation mechanism according to the present embodiment includes a first washer 16 arranged so as to connect two adjacent bolts, and a second washer stopped against rotation with respect to the hexagonal bolt heads 12a and 12b. 1
8 and 20. This detent mechanism is configured to be suitable for a bolt / nut tightening tool disposed near the corner 14a of the member 14 to be tightened.

The first washer 16 includes a main body 22 extending between the two bolts and a protrusion 2 extending outward from the main body 22.
8, 30. In the body 22, through holes 24 and 26 are formed at positions corresponding to the screw holes, through which the shafts (screw portions) of the bolts pass. Projections 28, 30
Extend in the outer radial direction from the main body 22. Also,
The width of the protruding portions 28 and 30 on the side of the main body 22 (root portion) is preferably made as small as possible in consideration of cutting later. By employing such a configuration, the first washer 16 is prevented from rotating with respect to the member 14 to be tightened.

The second washer 18 has a fitting portion 32 fitted to the bolt head 12a and a projecting portion 34 extending outward from the center of the bolt. The fitting part 32 is fitted on the bolt head 12 a on the first washer 16 after tightening the bolt and nut. The protrusion 34 is provided with the first washer 1.
The joints 40 are joined to the six protrusions 28. Projections 28, 34 of first and second washers 16, 18
The joining between them can be realized by, for example, a method such as spot welding, brazing, or bonding.

Similarly to the washer 18, the second washer 20 has a fitting portion 36 fitted to the bolt head 12b and a projecting portion 38 extending outward from the center of the bolt. The fitting portion 36 is fitted to the bolt head 12b on the first washer 16 after tightening the bolt and nut. The protrusion 38 is joined to the protrusion 30 of the first washer 16 at a joint 40. First and second washers 1
The joint between the 6, 20 projecting portions 30, 38 can be realized by, for example, spot welding, brazing, bonding, or the like.

The protrusion 28 of the first washer 16 is
4 is formed so that the angle θ formed by the two outermost joints 40 from the center of 4 is 30 ° or more. By setting the angle θ to 30 °, the bolt head 12
Regardless of the rotation position (a tightening angle) of a, the projections 28 and 34 of the first and second washers 16 and 18 can be joined to each other. First and second washers 16, 18
Has a thickness and thickness that cannot be easily deformed or cut off so that a third party cannot intentionally and easily remove it. The other protruding portion 30 of the first washer 16 is configured similarly to the protruding portion 28.

FIG. 4 shows a use state (state at the time of joining) of the detent mechanism according to the first embodiment. When using the rotation preventing mechanism of this embodiment, first, the shaft portion (screw portion) of the bolt is inserted into the through-holes 24 and 26 of the first washer 16 from above from the tightened member 14. In this example, the spot welding machine 4
2, the projections 30, 38 of the first and second washers 16, 20 (18) are joined together.

Next, the member to be tightened 14 is fixed by tightening the bolts and nuts. Thereafter, the second washers 18 and 20 are respectively fitted to the bolt heads 12a and 12b, and the first and second washers 16 and 20 (1
8) bonding. In this embodiment, only one portion is joined, but if necessary, a plurality of portions may be joined by spot welding.

FIG. 5 shows a use state (a state at the time of cutting / releasing) of the rotation preventing mechanism according to the first embodiment. In the present embodiment, a hydraulic cutter 44 is used to cut a joint (weld) 40 between the first and second washers 16 and 20. When disassembling the tightened member 14 fixed in the above-described procedure, the joint 40
Cut the inner part (bolt side). The joint (weld) 4 of the first and second washers 16, 20 (18)
As the zero cutting tool, an electric grinder or the like can be used in addition to the hydraulic cutter 40. That is, it is made difficult to disassemble with a general tool such as a screwdriver or a plier, and at the same time, it is easy to disassemble with a hydraulic cutter or an electric grinder.

As described above, in the present embodiment, there is no need to directly join the bolt heads 12a and 12b or the member 14 to be tightened by welding or the like, and even if the material cannot be bonded or welded, it can be securely stopped. Can be. In addition, it is possible to relatively easily perform the detent work without requiring special skills such as bending the washer to the nut without any gap. The second washers 18 and 20 that mechanically fix the bolt heads 12a and 12b are integrated with the first washers 16 by strong joining such as welding, brazing, and adhesion. Therefore, the rotation stopper cannot be easily removed with a general tool. This has the effect of preventing a third party from intentionally removing the detent.

FIG. 6 shows a detent mechanism according to a second embodiment of the present invention. Components that are the same as or correspond to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the rotation preventing mechanism of the present embodiment, the protruding portions 52 and 54 of the first and second washers 48 and 50 are bent upward from the surface of the member 14 to be tightened (stand up). With such a configuration, workability at the time of joining and cutting the protruding portions 52 and 54 is improved.

FIG. 7 shows a second washer 56 used in the third embodiment of the present invention. The washer 56 is used in place of the washers 18 and 20 of the first embodiment.
It has a substantially circular main body 58, a hexagonal opening 60 that fits over the entire outer periphery of the bolt heads 12 a, 12 b, and a projection 62 that is joined to the first washer 16. According to the present embodiment, the engagement between the bolt heads 12a and 12b, the second washer and 56 is strengthened, and the rotation is more reliably prevented.

FIG. 8 shows a detent mechanism according to a fourth embodiment of the present invention. Components that are the same as or correspond to those in the above embodiments are given the same reference numerals, and duplicate descriptions are omitted. The detent mechanism of the present embodiment is designed to be used together with the spring washer 64. That is, the bent portion 68 is provided on the protruding portion 70 side of the second washer 66 of the rotation preventing mechanism of this embodiment, and the spring washer 64 is provided.
It absorbs the thickness. Thus, by interposing the spring washer 64 between the first and second washers 16 and 66, the detent performance is further improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be modified within the scope of the technical idea described in the claims. is there.

[0023]

As described above, according to the present invention, the first washer is provided so as to be engaged with the shaft portions of a plurality of adjacent fasteners and not to rotate with respect to the member to be tightened (14). (16); and a second washer (18, 20) provided so as not to rotate with respect to the plurality of fasteners. Then, the first and second washers (16, 18, 2)
0), the member to be tightened (14)
To prevent rotation of multiple fasteners. Therefore, there is an effect that the rotation can be easily stopped without requiring skill. In addition, the bolt and nut can be reused even after disassembly (release of the rotation stop), and there is an effect that an easy disassembly by an unauthorized third party can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a rotation preventing mechanism according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a rotation preventing mechanism according to the first embodiment.

FIG. 3 is a plan view showing a configuration of a first washer used in the first embodiment.

FIG. 4 is a side view showing a use state (state at the time of joining) of the first embodiment.

FIG. 5 is a side view showing a use state (a state at the time of cutting / releasing) of the first embodiment.

FIG. 6 is a side view showing a rotation preventing mechanism according to a second embodiment of the present invention.

FIG. 7 is a plan view showing a second washer used in a third embodiment of the present invention.

FIG. 8 is a side view showing a detent mechanism according to a fourth embodiment of the present invention.

[Explanation of symbols]

 12a, 12b Bolt head 14 Member to be tightened 16 First washer 18, 20 Second washer 28, 30 Projection (first washer) 34, 38 Projection (second washer) 24, 26 Through hole 40 Joint (weld)

Claims (17)

[Claims] 1. A detent mechanism applied to a plurality of rotary fasteners adjacent to each other, the first locking mechanism being engaged with shaft portions of the plurality of fasteners and provided so as not to rotate with respect to a member to be tightened. And a second washer provided so as not to rotate with respect to the plurality of tightening tools; by joining the first and second washers, the plurality of tightenings on the member to be tightened are provided. A non-rotating mechanism that prevents rotation of the tool. 2. The anti-rotation mechanism according to claim 1, wherein the second washer has a fitting portion that fits with at least a part of the fastener after fastening. 3. The anti-rotation mechanism according to claim 3, wherein a fitting portion of the second washer is fitted to an outer peripheral portion of the fastener. 4. The first washer includes a plurality of protrusions extending outward from each fastening portion, and the second washer includes protrusions each extending outward from the fastening portion.
The rotation preventing mechanism according to claim 1, 2, or 3, wherein the protrusions of the second washer are joined to each other. 5. The projection of the first washer is formed so as to always overlap with the projection of the second washer regardless of the rotational position of the fastener. The detent mechanism according to 1. 6. The rotation preventing mechanism according to claim 4, wherein the projections of the first and second washers are bent so as to rise from the surface of the member to be tightened. 7. A method according to claim 1, wherein said first and second washers are joined by welding.
The detent mechanism according to 1. 8. The first washer used in the detent mechanism according to claim 1. 9. The first washer according to claim 8, further comprising a plurality of projections joined to the projections of the second washer extending outward from the fastening portion. 10. The first projection according to claim 9, wherein the projection is formed so as to always overlap with the projection of the second washer regardless of the rotational position of the fastener. Washer. 11. The first projection according to claim 9, wherein the projection is bent together with the projection of the second washer so as to rise from the surface of the member to be tightened. Washer. 12. The second washer used in the detent mechanism according to claim 1. 13. The second washer according to claim 12, further comprising a fitting portion that fits at least a part of the fastener after fastening. 14. The second washer according to claim 13, wherein the fitting portion is fitted to an outer peripheral portion of the fastener. 15. The first member extending outward from a fastening portion.
The second washer according to claim 12, 13 or 14, further comprising a protrusion joined to the protrusion of the washer. 16. The second washer according to claim 15, wherein the projecting portion is bent together with the projecting portion of the first washer so as to rise from the surface of the member to be tightened. 17. The method according to claim 1, wherein the rotation stop is released by cutting a joint between the first and second washers.