JP2000009127A - Stopper and screw fastener protection device - Google Patents

Abstract

(57) [Problem] To provide a stopper for preventing loosening and removal, and a screw fastening part protection device for preventing a screw fastening part from being intentionally loosened. A stopper (1) rises substantially obliquely, and has a rising portion (3) whose tip (4) is closed in a circular shape. The male screw body 7 is inserted into the screw insertion hole 5 formed in the tip 4.
When the rising portion 3 is compressed in a state where is inserted, the rising portion 3 is deformed so that the tip portion 4 bites into the thread groove of the male screw body 7, thereby preventing the rising portion 3 from being loosened and prevented from coming off. The screw fastening portion protection device has a nut cover and a rising portion that rises substantially obliquely. When the male screw body is inserted between the tips of the rising parts and the nut is housed in the nut cover, when the rising part is compressed, the tip bites into the thread groove of the male screw body and the nut cover is fixed to the male screw body And the nut cannot be loosened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fastener for preventing a screw fastening portion from being loosened and coming off, a fastener capable of fastening without using a nut, and a screw fastening portion which must not be loosened. The present invention relates to a screw fastening portion protection device that prevents loosening or accidental loosening.

[0002]

2. Description of the Related Art The present applicant has previously described Japanese Patent Application Laid-Open
In No. 5, as a washer that performs the function of preventing loosening and retaining, "By processing a plate material, a screw insertion hole through which a male screw body is inserted, and an oblique axis direction such that the tip is directed toward the center side of the screw insertion hole. With a rising part that rises,
When the fastening structure including the male screw body is tightened and the rising part is compressed in the axial direction, the rising part is deformed so that its tip bites into the thread groove of the male screw body. "

[0003]

One of the objects of the present invention is to further improve the washer of the embodiment disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-250535, and to more strongly prevent loosening and slipping. It is to provide a stop which can be performed.

[0004] It is another object of the present invention to provide a stop which cannot be removed unless it is broken once it is fixed to the male screw body.

[0005] Another object of the present invention is to provide a stopper which can be fastened without using a nut.

Another object of the present invention is to provide a screw fastener protecting device which prevents a screw fastener which should not be loosened from being intentionally loosened or accidentally loosened.

Further objects of the present invention will become clear from the description hereinafter.

[0008]

One of the stoppers of the present invention is formed by processing a plate material, rises substantially obliquely in the axial direction, and has a rising portion whose tip is closed in a circular shape. And a screw insertion hole through which the male screw body is inserted in the axial direction. When a compressive force of a certain magnitude or more is applied in the axial direction to the rising portion, the tip of the rising portion is deformed so as to bite into the thread groove of the male screw body.

Therefore, for example, when the stopper is interposed between the nut screwed to the male screw body and the tightened body and the nut is tightened, the rising portion is compressed in the axial direction and deformed, and the rising portion is deformed. The tip of the portion is in a state of biting into the thread groove of the male screw body. As a result, the stopper is fixed to the male screw body. And since the nut is strongly pressed against the stopper, the nut cannot rotate with respect to the stopper, and the nut is also locked to the male screw body. Done. Also, if the nut loosens and falls off from the male screw body for any reason, the stopper will continue to stick to the male screw body, so that the male screw body will not come off from the screw insertion hole of the tightened body. Achieved, the fastening between the male screw body and the tightened body is maintained.

In the embodiment of the washer disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-250535, the leading ends of the rising portions are not closed in a circular shape. When a large rotational force is applied to the washer in the loosening direction, the tips of the plurality of rising portions act as female screw threads, and the washer moves in the same loosening direction as the nut. It was to rotate and move in the axial direction. For this reason, it was possible to remove the washer from the male screw body by rotating it all the way in the loosening direction. However, in this stopper, the tip of the rising part is closed in a circular shape,
Since the leading end of the rising portion does not completely spirally bite into the thread groove of the male screw body, even if a large rotational force is applied to the stopper in the loosening direction, the stopper rotates in the loosening direction like a nut. It does not move in the axial direction. Therefore, the fastener cannot be removed from the male screw unless the fastener is broken.

Another one of the stoppers of the present invention is formed by processing a plate material, rises substantially obliquely to one side in the axial direction, and has a first rising portion whose tip is not closed in a circular shape. And a second rising portion, which is formed by processing a plate material and rises almost obliquely on the other side in the axial direction, and whose tip end portion is not closed in a circular shape. A male screw body is inserted in the axial direction between the first end portions and between the end portions of the second rising portions, and the first and second rising portions are respectively connected to the axial line. When a compressive force of a certain magnitude or more is applied in the direction, the leading end of the rising portion is deformed so as to bite into the thread groove of the male screw body.

[0012] In this case, since the leading ends of the first and second rising portions are not closed in a circular shape, when compressed, they both bite into the thread groove of the male screw body in a spiral shape. Therefore, when a large rotational force is applied to the stopper in the loosening direction, the tips of the first and second rising portions perform the function of the female screw thread, and the stopper rotates in the loosening direction in the same manner as the nut. To move in the axial direction. Therefore, it is suitable when it is expected that it is necessary to remove the stopper in the future.

Further, since the rising portions are provided in two stages, it is possible to more strongly prevent loosening and coming-off as compared with the embodiment of the washer disclosed in Japanese Patent Application Laid-Open No. 9-250535.

According to the present invention, there is provided a screw fastening portion protection device for protecting a screw fastening portion having a male screw body and a nut to be protected screwed into the male screw body so as not to be loosened. The protection device includes a nut cover that accommodates the nut to be protected and a rising portion provided on the nut cover, which is formed by processing a plate material and rises substantially obliquely in the axial direction. The male screw body is inserted between the leading ends of the rising portions in the axial direction, and when the rising portion is subjected to a compressive force of a certain magnitude or more in the axial direction, the rising portion of the rising portion is removed. The tip is deformed so as to bite into the thread groove of the male screw body.

In this screw fastening portion protection device, the nut cover is put on the nut to be protected, the nut to be protected is accommodated inside the nut cover, and the male screw body is inserted between the tips of the rising portions. To do. When the rising portion is compressed and deformed, the leading end portion of the rising portion is in a state of biting into the thread groove of the male screw body. Thereby, the nut cover is fixed to the male screw body. In such a state, since the nut to be protected is housed in the nut cover, the nut to be protected cannot be loosened with a tool such as a spanner or a wrench. Further, since the nut cover is fixed to the male screw body as described above, the nut cover cannot be removed from the male screw body.

Thus, the nut to be protected can be prevented from being intentionally loosened or accidentally loosened. Further, since the nut cover is fixed to the male screw body, the effect of preventing the nut to be protected from loosening and preventing the male screw body from coming off can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

[0018]

1 to 4 show a first embodiment of a fastener according to the present invention. The stopper 1 is formed by integrally forming a metal plate material such as a steel plate or a stainless steel plate by press working.
And a rising portion 3. The base 2 has a flat annular shape. The rising portion 3 rises substantially obliquely in the axial direction from the inner periphery of the base portion 2, the tip portion 4 is closed in a circular shape, and a screw insertion hole 5 is formed in the tip portion 4. . An appropriate number of windows 6 are opened in the rising portion 3, and in the portion where these windows 6 are provided, the rising portion 3 has a tip 4.
Only the vicinity is left in an arc shape.

FIGS. 5 and 6 show an example in which the fastener 1 of the first embodiment shown in FIGS. 1 to 4 is used in a fastening structure using a male screw 7 such as a bolt and a nut 8.

In this use example, the stopper 1 is oriented so that the base 2 comes into contact with the seating surface of the nut 8.
The male screw body 7 is inserted through the screw insertion hole 5 and is interposed between the nut 8 and the tightened body 9. The diameter of the screw insertion hole 5 of the stopper 1 is slightly larger than the outer diameter of the male screw of the male screw body 7. The tightened body 9 is configured to be tightened between the nut 8 and a head (not shown) of the male screw body 7 with the male screw body 7 inserted into the screw insertion hole 10.

In this example of use, when the nut 8 rotates in the tightening direction, the base 2 of the stopper 1 first comes into contact with the seating surface of the nut 8 as shown in FIG. When the portion 4 is brought into contact with the tightened body 9 and further tightening is performed, the rising portion 3 of the stopper 1 is sandwiched between the nut 8 and the tightened body 9 as shown in FIG. As a result, the distal end portion 4 of the rising portion 3 is cut into the thread groove of the male screw body 7 by being compressed inward. Thus, the stopper 1 is fixed to the male screw body 7. Since the nut 8 is strongly pressed against the stopper 1, the nut 8 cannot rotate with respect to the stopper 1, so that the nut 8 is also locked with respect to the male screw body 7. , The nut 8 is prevented from loosening. Further, after that, even if the nut 8 is loosened and falls off from the male screw body 7 for some reason, the stopper 1 continues to be fixed to the male screw body 7. The locking of the male screw body 7 is achieved, and the fastening between the male screw body 7 and the tightened body 9 is maintained.

In the embodiment of the washer disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-250535, the leading ends of the rising portions are not closed in a circular shape. When a large rotational force is applied to the washer in the loosening direction, the tips of the plurality of rising portions function as female threads, and the washer is loosened in the same way as the nut. And then move in the axial direction. For this reason, it was possible to remove the washer from the male screw body by rotating it all the way in the loosening direction. However, in this embodiment, since the leading end 4 of the rising portion 3 is closed in a circular shape, the leading end 4 of the rising portion 3 does not completely spirally bite into the thread groove of the male screw body 7.
Even if a large rotational force is applied to the stopper 1 in the loosening direction, the stopper 1 does not rotate in the loosening direction and move in the axial direction in the same manner as the nut. Therefore, the stopper 1 cannot be removed from the male screw body 7 unless the stopper 1 is destroyed.

Further, in this embodiment, since the window portion 6 is provided in the rising portion 3, the resistance when the rising portion 3 is compressed and deformed can be reduced.

FIG. 6 schematically shows a state in which the nut 8 is tightened until the stopper 1 becomes almost completely flat. However, the tightening of the nut 8 is stopped before the stopper 1 becomes almost flat. In the same manner as described above, the effect of preventing loosening and retaining can be obtained.

If the screw insertion hole 2 of the stopper 1 is made larger than the external diameter of the male screw of the male screw body 7, the screw insertion hole 5
When the male screw body 7 is inserted through the
Thus, the external thread of the external thread body 7 is not damaged.

FIGS. 7 and 8 show an example in which the stopper 1 of the first embodiment shown in FIGS. 1 to 4 is used in a double nut structure, and the nuts 8 and 11 screwed to the male screw body 7 are shown. And a stopper 1 is interposed therebetween.

In this example of use, when the nut 8 is tightened after the nut 11 is tightened, the base 2 of the stopper 1 first comes into contact with the seating surface of the nut 8 as shown in FIG. When the distal end portion 4 side of the portion 3 is brought into contact with the nut 11 and further tightening is performed, the rising portion 3 of the stopper 1 as shown in FIG.
, And is compressed in the axial direction, so that the distal end 4 of the rising portion 3 is
It will be in the state of biting into the thread groove. As a result, the stopper 1 is fixed to the male screw body 7 and the nut 1
The locking of 1 is performed. Further, since the nut 8 cannot be rotated with respect to the stopper 1 due to being strongly pressed by the stopper 1, the nut 8 is also locked with respect to the male screw body 7, and the nut 8 is also prevented from loosening. Done.

Here, in this example of use, even if the outer nut 8 (the nut farther from the tightened body 9) is loosened for some reason, the inner nut (the tightened body 9) is not used. , The nut) 11 is kept loose by the stopper 1, so that it can be more firmly stopped than a normal double nut structure.

In the same manner as in the above embodiment,
Even if the nut 8 comes off from the male screw body 7, the nut 11 further comes off from the male screw body 7, so that the male screw body 7 does not fall out from the screw insertion hole 10 of the tightened body 9, and the male screw body 7 is prevented from coming off. Is also achieved.

FIGS. 9 and 10 show an example in which the stopper 1 of the first embodiment shown in FIGS. 1 to 4 is used without being used together with a nut.

In this use example, the stopper 1 is hit or pressed in the axial direction through the cylindrical inclusion 12 as shown in FIG. 3 is deformed inward so that the leading end portion 4 of the rising portion 3 is cut into the thread groove of the male screw body 7. This allows
The stopper 1 is fixed to the male screw body 7, and the fastening can be performed without using a nut.

Also in this case, since the distal end 4 of the rising portion 3 is closed in a circular shape, the distal end 4 of the rising portion 3 does not bite completely into the thread groove of the male screw body 7 in a spiral manner. Even if a large rotational force is applied to the tool 1 in the loosening direction, the stopper 1 does not rotate in the loosening direction like the nut and does not move in the axial direction. Therefore, the stopper 1 cannot be removed from the male screw body 7 unless the stopper 1 is destroyed.

FIG. 11 shows a second embodiment of the fastener 1 according to the present invention. The stopper 1 of the present embodiment is the same as that of FIGS.
The two stoppers 1 of the first embodiment 4 are integrated by joining their bases 2 to each other by welding. As a result, the stopper 1 of the present embodiment rises substantially obliquely to one side in the axial direction, and has a first rising portion 3a whose tip is closed in a circular shape and a tip of the first rising portion 3a. A first screw insertion hole 5a formed in the portion 4a, through which the male screw body 7 is inserted in the axial direction, and a first screw insertion hole 5a, which rises substantially diagonally to the other side in the axial direction, and whose tip is closed in a circular shape. A second raised portion 3b and a second screw insertion hole 5b formed in the distal end portion 4b of the second raised portion 3b and through which the male screw body 7 is inserted in the axial direction.
And

FIGS. 12 and 13 show an example in which the fastener 1 of the second embodiment shown in FIG. 11 is used in a fastening structure using a male screw 7 such as a bolt and a nut 8.

In this use example, the stopper 1 is interposed between the nut 8 and the tightened member 9 in a state where the male screw 7 is inserted through the first and second screw insertion holes 5a and 5b. Is done. The diameter of the screw insertion holes 5a and 5b of the stopper 1 is slightly larger than the outer diameter of the male screw of the male screw body 7.
The tightened body 9 is configured to be tightened between the nut 8 and a head (not shown) of the male screw body 7 with the male screw body 7 inserted into the screw insertion hole 10.

In this use example, as the nut 8 is tightened, the first and second rising portions 3a and 3b of the stopper 1 are sandwiched between the seating surface of the nut 8 and the tightened body 9. Then, when further tightening is performed, the first and second rising portions 3a, 3b of the stopper 1 are compressed in the axial direction as shown in FIG. Are cut into the thread grooves of the male screw body 7. As a result, loosening and removal are prevented in the same manner as in the above-described embodiment.

In this embodiment, the rising portions 3a,
Since the 3b is provided in two stages, it is possible to more strongly prevent loosening and falling off.

Also in the present embodiment, the first and second rising portions 3a and 3b are deformed by hitting or pressing with means other than the nut without using the nut together with the nut, so that the tip portion 4a is deformed. , 4b may be cut into the thread groove of the male screw body 7.

FIGS. 14 to 16 show a third embodiment of the stopper 1 according to the present invention. One side (upper side in the drawing) of the stopper 1 of this embodiment is the first embodiment of FIGS. Example stop 1
It consists of. One side of the first rising portion 3 rises substantially obliquely to one side in the axial direction, and is formed in the first rising portion 3 having a circularly closed distal end and the distal end 4 of the first rising portion 3. Male screw 7
And a screw insertion hole 5 through which is inserted in the axial direction.

The other side (the upper and lower sides in the figure) of the stopper 1 of this embodiment is shown in perspective and bottom views in FIGS.
Is constituted by a member 13 having a shape as shown in FIG. The member 13 is formed by integrally pressing a metal plate such as a steel plate or a stainless steel plate by press working, and has a base 14 and a plurality (four) of second rising portions 15.
The base 14 is annular and flat. The second rising portions 15 rise substantially obliquely in the axial direction from the inner periphery of the base portion 14, and the tip portions 16 of these second rising portions 15 are not closed in a circular shape. The base 14 of the member 13 and the base 2 of the upper part in the figure are welded to each other and integrated.

Also in this embodiment, the male screw body 7 is inserted between the screw insertion hole 5 and the distal end portion 16 of the second rising portion 15 so as to be used similarly to the case of the second embodiment of FIG. , Can be prevented from loosening. In this case, the second rising portions 15 are also compressed and deformed in the axial direction, so that their tip portions 1 are formed.
6 bites into the thread groove of the male screw body 7, but since the tip 16 of the second rising portion 15 is not closed in a circular shape, the tip 16 bites into the thread groove of the male screw body 7 in a spiral shape. become.

Also in this embodiment, since the rising portions 3 are provided in two stages, it is possible to more strongly prevent loosening and falling off.

FIG. 17 shows a fourth embodiment of the fastener 1 according to the present invention. The stopper 1 of this embodiment is the same as that of FIG.
And 16 members 13 and their bases 14 are integrated with each other by welding. Thereby, the stopper 1 of the present embodiment rises substantially obliquely to one side in the axial direction, and has a first rising portion 15a whose tip end 16a is not closed in a circular shape and the other side in the axial direction. And a second rising portion 15b whose tip portion 16b is not closed in a circular shape.

Also in this embodiment, the male screw body 7 is inserted between the distal end portions 16a of the first rising portions 15a and between the distal end portions 16b of the second rising portions 15b, so that the same as in each of the above embodiments. It can be used to prevent loosening and removal. In this case, the tip portions 16a of the first and second rising portions 15a, 15b,
16b are not closed in a circular shape, and when compressed, all of them will bite into the thread groove of the male screw body 7 in a spiral shape. Therefore, when a large rotational force is applied to the stopper 1 in the loosening direction, the first and second rising portions 3
Of the female thread serves as a female screw thread, and the stopper 1
Rotates in the loosening direction like the nut and moves in the axial direction. For this reason, it is suitable when it is anticipated that it will be necessary to remove the stopper 1 in the future.

Further, since the rising portions 15a and 15b are provided in two stages, the locking and the locking are more strongly performed as compared with the embodiment of the washer disclosed in the above-mentioned JP-A-9-250535. Can be.

FIGS. 18 to 20 show a fifth embodiment of the fastener 1 according to the present invention. In the stopper 1 of the present embodiment, a plurality of (four) first rising portions 17 are formed by cutting and raising a part of the plate material to one side in the axial direction, while the other one of the common plate material is formed. A plurality of (four) second rising portions 18 are formed by cutting and raising the portion on the other side in the axial direction. The tip 19 of each first rising portion 17 and the tip 20 of each second rising portion 18
Is not closed in a circle. In this embodiment, the same operation and effect as the stopper 1 of the fourth embodiment in FIG. 17 can be obtained.

FIGS. 21 to 27 show a first embodiment of the screw fastening part protecting device according to the present invention. In this embodiment, the nut cover 21 includes a cylinder 22 and a lid 23. The cylindrical body 22 is made of metal such as steel and has a substantially cylindrical shape, but is provided with a rib 24 extending in a circumferential direction. The lid 23 is formed by pressing a metal plate material such as a steel plate,
As shown in FIG. 22, it is integrated with the cylindrical body 22 by being welded in a state fitted to one end of the cylindrical body 22. A rising portion 25 is integrally provided on the ceiling of the lid 23. This rising portion 25 is
2 and rises substantially obliquely to the inside of the cylindrical body 22, the tip 26 of the rising portion 25 is closed in a circular shape, and a screw insertion hole 27 is formed in the tip 26. ing. An appropriate number of windows 28 are opened in the rising portion 25, and in the portion where these windows 28 are provided, the rising portion 25 is left only in the vicinity of its tip in an arc shape. .

In FIG. 24, a male screw body 7 such as a bolt is inserted into a screw insertion hole 10 provided in the body 9 to be tightened. This male screw body 7 has two nuts 29 to be protected.
30 is screwed in a double nut system, and the tightened body 9 is tightened between the nuts 29 and 30 to be protected and the head (not shown) of the male screw body 7. The nuts to be protected 29 and 30 must not be loosened in a normal state.

To prevent the nuts to be protected 29, 30 from being intentionally loosened or accidentally loosened,
Put the nut cover 21 over the nuts 29 and 30 to be protected,
The nuts to be protected 29 and 30 are accommodated in the nut cover 21. At this time, the male screw 7 is inserted into the screw insertion hole 27 of the lid 23 (the diameter of the screw insertion hole 27 is set to be slightly larger than the outer diameter of the male screw of the male screw 7. ). Next, a nut 31 for compressive deformation composed of a cap nut is screwed into the distal end portion of the male screw body 7 protruding outside the lid 23, and tightened. Then, the rising portion 25 is made up of the compression deformation nut 31 and the protection target nut 2.
9 and compressed in the axial direction,
As shown in FIG. 25, the distal end portion 26 of the rising portion 25 is deformed inward, and is brought into a state in which the distal end portion 26 bites into the thread groove of the male screw body 7. As a result, the lid 23 and the entire nut cover 21 are fixed to the male screw body 7.

In such a state, the nuts to be protected 29, 30 are accommodated in the nut cover 21, so that the nuts to be protected 29, 30 cannot be loosened with a tool such as a spanner or a wrench. Even if the nut for compression deformation 31 is loosened and removed from the male screw body 7, the nut cover 21 is fixed to the male screw body 7 as described above, and the nut cover 21 cannot be removed from the male screw body 7. . In the present embodiment, as in the case of the stopper 1 of the first embodiment shown in FIGS. 1 to 4, since the tip 26 of the rising portion 25 is closed in a circular shape, the tip 26 of the rising portion 25 is closed. Does not bite completely into the thread groove of the male screw body 7, so that even if a large rotational force is applied to the nut cover 21 in the loosening direction, the nut cover 21 rotates in the loosening direction and moves in the axial direction. Never. Therefore, unless the nut cover 21 is destroyed,
The nut cover 21 cannot be removed from the male screw body 7.

As described above, this screw fastening portion protection device can prevent the nuts 29 and 30 to be protected from being intentionally loosened or accidentally loosened. In addition, since the lid 23 is fixed to the male screw body 7, the nuts 29 and 30 to be protected can be prevented from loosening and the male screw body 7 can be prevented from coming off.

In this embodiment, the ribs 24 are
Is provided, the rigidity of the cylindrical body 22 increases,
It becomes difficult to break the cylinder 22.

FIGS. 26 and 27 show the nut 3 for compression deformation.
The example of use when 1 is not used is shown. In this case, as shown in FIG.
3 by tapping or pressing in the axial direction.
As shown in FIG. 7, the rising portion 25 is deformed inward so that the distal end portion 26 of the rising portion 25 is made to bite into the thread groove of the male screw body 7. This makes it possible to quickly protect the fastening portion without using a compression deformation nut.

FIGS. 28 to 30 show a second embodiment of the screw fastening portion protection device according to the present invention. In this embodiment, the ribs 24 are not provided on the cylindrical body 22. Also, the lid 23
Are provided with a plurality of (four) rising portions 25, and these rising portions 25 rise substantially obliquely in the axial direction of the cylindrical body 22 and inside the cylindrical body 22. The tip portions 26 of these second rising portions 25 are not closed in a circular shape. Other configurations are the same as those in the embodiment of FIGS.

The screw fastening portion protection device of this embodiment can also protect the screw fastening portion so as not to be subjected to loosening work in exactly the same manner as in the embodiment of FIGS. However, in this case, since the distal end portion 26 of the rising portion 25 is not closed in a circular shape, when it is compressed, all of the end portions 26 bite into the thread groove of the male screw body 7 in a spiral shape. Therefore, when a large rotational force is applied to the nut cover 21 in the loosening direction by using a special tool or the like, the tip end portion 26 of the rising portion 25 functions as a female screw thread, and the nut cover 21 is formed in the same manner as the nut. It rotates in the loosening direction and moves in the axial direction. Therefore, it is suitable when it is expected that the nut cover 21 will need to be removed in the future.

In each of the embodiments of the screw fastening portion protection device shown in FIGS. 21 to 30, the rising portion 25 is provided in one step, but as in the case of the embodiment of the stopper shown in FIGS. The rising portions may be provided in two or more stages.

FIGS. 31 and 32 show a third embodiment of the screw fastening part protection device according to the present invention. In the present embodiment, the ceiling of the nut cover 21 having a substantially bottomed cylindrical shape is not provided with a rising portion, but is provided with a screw insertion hole 32. Outside the nut cover 21, between the ceiling portion of the nut cover 21 and the compression deformation nut 31, the stopper 1 of the first embodiment of FIGS.
Here, the male screw body 7 to which the protection target nuts 29 and 30 are screwed is inserted into the screw insertion hole 32 of the nut cover 21 and the screw insertion hole 5 of the stopper 1. Note that the stopper 1 has a size that cannot pass through the screw insertion hole 32 of the nut cover 21.

Also in the present embodiment, the nut 31 for compression deformation is screwed into the male screw body 7 and tightened (or beaten by means other than the nut or pressed in the axial direction).
And the rising portion 3 is deformed inward to form the rising portion 3
Of the male screw body 7 bites into the screw groove of the male screw body 7, the stopper 1 is fixed to the male screw body 7, and the nut cover 21 cannot be removed from the male screw body 7. Thereby, similarly to the case of each of the above-described embodiments, the nut to be protected 2
It is possible to prevent the 9, 9 from being intentionally loosened or accidentally loosened.

Note that, as in this embodiment, the nut cover 21
When a stopper which is separate from the nut cover 21 is used without providing a rising portion that cuts into the thread groove of the male screw body itself, instead of the stopper 1 of FIGS.
Alternatively, a stopper as in the above embodiments may be used.

Further, in each of the embodiments of the screw fastening portion protection device shown in FIGS. 21 to 32, the nut to be protected is a double nut, but the nut to be protected is not necessarily a double nut and can be used alone. It may be.

[0061]

As described above, the stopper according to the present invention is
(A) The fastening portion can be strongly prevented from loosening and coming off. (B) Once fixed to the male screw body, it cannot be removed unless it is broken. (C) Excellent effects such as fastening can be performed without using a nut.

Further, the screw fastening portion protection device according to the present invention has excellent effects such as preventing a screw fastening portion which should not be loosened from being intentionally loosened or accidentally loosened. It is something that can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a stopper according to the present invention.

FIG. 2 is a plan view showing the stopper of the first embodiment.

FIG. 3 is a front view showing the stopper of the first embodiment.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a longitudinal sectional view showing a state immediately before a nut is tightened in a use example of the stopper of the first embodiment.

FIG. 6 is a longitudinal sectional view schematically showing a state after tightening of a nut in the use example of the stopper of the first embodiment.

FIG. 7 is a longitudinal sectional view showing a state before the outer nut is tightened in a usage example in which the stopper of the first embodiment is used in a double nut structure.

FIG. 8 is a longitudinal sectional view schematically showing a state after tightening an outer nut in a usage example used in the double nut structure.

FIG. 9 is a longitudinal sectional view showing a state before the fastener is deformed when fastening is performed without using a nut with the fastener of the first embodiment.

FIG. 10 is a vertical cross-sectional view showing a state when the deformation of the fastener is completed when fastening is performed without using a nut in the fastener of the first embodiment.

FIG. 11 is a longitudinal sectional view showing a second embodiment of the stopper according to the present invention.

FIG. 12 is a longitudinal sectional view showing a state immediately before a nut is tightened in a use example of the stopper of the second embodiment.

FIG. 13 is a longitudinal sectional view schematically showing a state after tightening a nut in the use example of the stopper of the second embodiment.

FIG. 14 is a longitudinal sectional view showing a third embodiment of the stopper according to the present invention.

FIG. 15 is a perspective view showing members constituting one side of the stopper of the third embodiment.

FIG. 16 is a bottom view showing the member of the third embodiment.

FIG. 17 is a longitudinal sectional view showing a fourth embodiment of the fastener according to the present invention.

FIG. 18 is a plan view showing a fifth embodiment of the fastener according to the present invention.

19 is a sectional view taken along line XIX-XIX in FIG.

20 is a sectional view taken along line XX-XX in FIG.

FIG. 21 is an exploded perspective view showing a nut cover in the first embodiment of the screw fastening portion protection device according to the present invention.

FIG. 22 is a longitudinal sectional view showing the nut cover.

FIG. 23 is a bottom view showing the nut cover.

FIG. 24 is a longitudinal sectional view showing a state immediately before a compression deformation nut is tightened in the first embodiment of the screw fastening portion protection device.

FIG. 25 is a longitudinal sectional view schematically showing a state after a compression deformation nut is tightened in the first embodiment of the screw fastening portion protection device.

FIG. 26 is a longitudinal sectional view showing a state before a rising portion is deformed when a nut cover is mounted on a male screw body without using a compression deformation nut in the first embodiment of the screw fastening portion protection device. .

FIG. 27 is a longitudinal sectional view showing a state when the deformation of the rising portion is completed when the nut cover is mounted on the male screw body without using a compression deformation nut in the first embodiment of the screw fastening portion protection device. .

FIG. 28 is an exploded perspective view showing a nut cover in the second embodiment of the screw fastening portion protection device according to the present invention.

FIG. 29 is a longitudinal sectional view showing a nut cover in the second embodiment of the screw fastening portion protection device.

FIG. 30 is a bottom view showing a nut cover in the second embodiment of the screw fastening portion protection device.

FIG. 31 is a longitudinal sectional view showing a state immediately before tightening a compression deformation nut in the third embodiment of the screw fastening portion protection device according to the present invention.

FIG. 32 is a longitudinal sectional view schematically showing a state after the compression deformation nut is tightened in the third embodiment of the screw fastening portion protection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopper 3, 3a, 3b Rising part 4, 4a, 4b Tip part of rising part 5, 5a, 5b Screw insertion hole 6 Window 7 Male screw body 15 Rising part 16 Tip part of rising part 17, 18 Rising part 19, DESCRIPTION OF SYMBOLS 20 Top part of rising part 21 Nut cover 25 Rising part 26 Front part of rising part 27 Screw insertion hole 29, 30 Nut to be protected 31 Compression deformation nut 32 Screw insertion hole

Claims (11)

[Claims] 1. A plate material is formed, which is formed substantially obliquely in the axial direction, and is formed in a rising portion whose tip is closed in a circular shape and in the tip of the rising portion.
A screw insertion hole through which a male screw body is inserted in the axial direction,
The rising portion is characterized in that, when a compressive force of a certain magnitude or more is applied in the axial direction, the tip of the rising portion is deformed so as to bite into the thread groove of the male screw body. Stopper. 2. A first rising portion, which is formed by processing a plate material and rises substantially obliquely to one side in the axial direction, and has a tip portion closed in a circular shape, and a first rising portion having a tip portion. It is formed, the first screw insertion hole through which the male screw body is inserted in the axial direction, and the plate material is processed, it rises almost diagonally to the other side in the axial direction, and the tip is closed in a circular shape A second rising portion and a second screw insertion hole formed in the distal end portion of the second rising portion and through which the male screw body is inserted in the axial direction, wherein the first and second screw holes are provided. The rising portion is characterized in that when a compressive force of a certain magnitude or more is applied in the axial direction, the leading end of the rising portion is deformed so as to bite into the thread groove of the male screw body. Stopper. 3. The stop according to claim 1, further comprising a window portion opened at the rising portion. 4. A first rising portion, which is formed by processing a plate material, rises substantially obliquely to one side in the axial direction, and has a front end portion closed in a circular shape, and a first rising portion inside the first rising portion. It is formed, a screw insertion hole through which a male screw body is inserted in the axial direction, and a plate material is processed, the second screw is raised almost diagonally to the other side in the axial direction, and the tip is not closed in a circular shape. The male screw body is inserted in the axial direction between the distal ends of the second rising portions, and the first and second rising portions are respectively formed in the axial direction. A tip portion of the rising portion is deformed so as to bite into a thread groove of the male screw body when a compressive force of a predetermined magnitude or more is applied to the stopper portion. 5. A plate material is processed, and a first rising portion which rises substantially obliquely to one side in the axial direction and whose tip is not closed in a circular shape, and a plate material is processed, and is processed in the axial direction. Has a second rising portion, which is substantially obliquely raised on the other side, and whose tip is not closed in a circular shape, between the first tip and the tip of the second rising portion. The male screw body is configured to be inserted in the axial direction, and the first and second rising portions are each subjected to a compressive force of a certain magnitude or more in the axial direction,
A stopper, wherein a tip portion of the rising portion is deformed so as to bite into a thread groove of the male screw body. 6. The first and second rising portions are formed by cutting and raising a part of a common plate material on one side in the axial direction and another part on the other side in the axial direction. The stop according to claim 5, wherein 7. A screw fastening part protection device for protecting a screw fastening part having a male screw body and a nut to be protected screwed into the male screw body from being loosened, wherein the nut to be protected is provided. A nut cover for housing the
It is made by processing the plate material provided on this nut cover,
A rising portion that rises substantially obliquely in the axial direction, and the male screw body is inserted in the axial direction between the tips of the rising portions, and the rising portion has a size equal to or greater than a certain value in the axial direction. When a compressive force is applied, the leading end of the rising portion is deformed so as to bite into the thread groove of the male screw body. 8. The screw fastening portion protection device according to claim 7, wherein a tip portion of the rising portion is closed in a circular shape. 9. The screw fastening portion protection device according to claim 7, wherein a tip portion of the rising portion is not closed in a circular shape. 10. A nut for compression deformation, which is screwed to the male screw body outside the nut cover, and when the nut for compression deformation is tightened, the rising portion is compressed in the axial direction by the nut for compression deformation. The tip of the rising portion is deformed so as to bite into the thread groove of the male screw body.
The screw fastening part protection device according to the above. 11. A screw fastening portion protection device for protecting a screw fastening portion having a male screw body and a nut to be protected screwed into the male screw body from being loosened, wherein the nut to be protected is A nut cover for housing the
The nut cover is provided with a screw insertion hole through which the male screw body is inserted, and a rising portion formed by processing a plate material and rising substantially obliquely in the axial direction, and passing through the screw insertion hole of the nut cover. A stopper having a size that cannot be reached, and the male screw body is inserted between the tips of the rising portions of the stopper outside the nut cover, and the rising portion is at least a certain amount in the axial direction. Wherein a distal end of the rising portion is deformed so as to bite into a thread groove of the male screw body when a compressive force having a magnitude of?