JPH09210039A - Detent nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the compressive force of a bolt peripheral wall in a detent nut. SOLUTION: This nut is provided with receiving hardware 1 having a tapered through-hole 2, a tapered surface 6 which meets the tapered wall of the through- hole 2, and shank hole 4 which is screwed onto a bolt. By making a combination with tightening hardware 3 where a slit 7 is formed and pressing the tightening hardware 3 into the receiving hardware 1, the tightening hardware 3 is elastically deformed and the tightening hardware 3 is compressed against the peripheral wall of the bolt to constitute this detent nut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock nut.

[0002]

2. Description of the Related Art The applicant of the present invention has a structure in which a fastening fitting having a tapered outer wall is screwed into a receiving fitting having a tapered inner wall, and the fastening fitting is fixed by a locking member in a direction perpendicular to the shaft. Proposed locking nut (actual flat blade 7-
(8621)

[0003]

SUMMARY OF THE INVENTION In the above invention,
There was a problem that the pressure of the receiving metal fitting to the bolt could not be sufficiently obtained, and the receiving metal fitting had to be fixed by a locking member.

[0004]

According to the present invention, there is provided a metal fitting having a tapered through hole, a shaft hole having a female screw threaded to a bolt, and a tapered outer surface corresponding to the through hole of the metal fitting. By combining the tightening metal fitting tightly fitted to the receiving metal fitting and press-fitting the tightening metal fitting into the metal fitting, the tightening metal fitting is elastically deformed, and the tightening metal fitting is crimped to the peripheral wall of the bolt.

According to the first aspect of the invention, a through hole having a small diameter on the head side of the bolt is formed in the receiving metal fitting, and the base end of the tightening metal fitting is shaped so that the rotary tool can be locked, and the end portion is parallel to the shaft. It has a large slit. It is preferable to provide four or more slits when the slits are formed only at the end portions, but one slit may be provided when the slits are provided over the entire length of the fastening fitting (claim 3). According to a second aspect of the present invention, in addition to the slit parallel to the axis in the fastening member, a slit perpendicular to the axis is formed at the base of the tapered outer surface. In this case, two slits may be parallel to the axis.

According to a fourth aspect of the present invention, the through hole of the receiving fitting is a non-tapered portion formed with a female thread for screwing the bolt tip end side to the tightening fitting, and the head side of the bolt is continuous with the non-tapered portion. The taper portion having a large diameter is formed, and the outer surface of the receiving member is shaped so that the rotary tool can be locked. Then, a plurality of slits parallel to the axis are formed in the fastening fitting. The number of slits is preferably four or more, but the number of slits may be two by adding slits perpendicular to the axis. Further, if the slit is provided over the entire length of the tightening fitting, only one slit is required.
The base end of the tightening member is shaped so that the rotary tool can be locked.

[0007] It is preferable that the size of the receiving metal fitting and the tightening metal fitting is such that, at the time of tightening, the tip of the tightening metal fitting does not protrude from the tip of the receiving metal fitting (claim 5).

[0008]

In the invention of claims 1 to 3, when the shaft hole of the tightening member is screwed into the bolt and tightened, the tapered outer surface of the tightening member is pressed against the tapered surface of the receiving member and elastically deforms in the bolt direction. . As a result, the wall surface of the shaft hole of the tightening fitting is pressed against the bolt and integrated with the bolt, so that a large vibration resistance is obtained. In the invention of claim 4, when the shaft hole of the tightening metal fitting is screwed into the bolt to press the receiving metal fitting to the tightening plate and then the tightening metal fitting is rotated in the opposite direction, the taper surface of the tightening metal fitting becomes a tapered surface of the receiving metal fitting. It is crimped to and is elastically deformed in the bolt direction, and crimped to the bolt. Further, the tightening metal fitting can be crimped to the bolt by rotating the receiving metal fitting while the tightening metal fitting is fixed by the rotary tool.

[0009]

Embodiment 1 FIGS. 1 and 2 relate to the invention of claim 1. A tapered through hole 2 is formed in the receiving member 1, and the through hole 2 has a small diameter on the bolt head side (lower side in the drawing). A fastening member 3 is fitted in the through hole 2. This tightening fitting 3 has a shaft hole 4 in the center of which a female screw to be screwed into a bolt is formed, and its head is a flat hexagonal locking portion 5 so that a rotary tool such as a spanner can be locked. The portion of the receiving fitting 1 fitted into the through hole 2 is a tapered portion 6 having an inclination angle slightly less than that of the through hole 2. Four slits 7 are formed in the tapered portion 6 at intervals of 90 degrees so that the tapered portion 6 can be elastically deformed in the axial hole direction. In addition, this taper portion 6
Has a size such that the tip of the tapered portion 6 does not protrude from the lower surface of the receiving metal fitting 1 when the tightening metal fitting is tightened to the limit.

The lock nut constructed as described above is
The receiving metal fitting 1 is fitted into the bolt C inserted through the tightened objects A and B, and then the tightening metal fitting 3 is screwed into the bolt C. When the taper portion 6 of the tightening metal fitting 3 is tightened while being pressed against the tapered surface of the through hole 2 of the metal fitting 1, the taper portion 6 is narrowed by the tapered surface of the through hole 2 of the metal fitting,
Deforms in the bolt direction. That is, the inner wall of the tapered portion of the fastening member 3 presses the peripheral wall of the bolt C from the surroundings, and the inner wall of the tapered portion presses against the peripheral wall of the bolt C.
Therefore, the bolt C is fixed by pressure bonding between the lower surface of the receiving member 1 and the tightening object B, and pressure bonding around the bolt by the taper portion 6, so that a large anti-loosening effect against vibration can be obtained. In the above embodiment, the taper portion 6 has a size such that the tip of the taper portion 6 does not project beyond the lower surface of the receiving metal fitting 1 when the tightening metal fitting is tightened to the limit. Without being transmitted, the seismic effect is further improved.

[0011]

Embodiment 2 FIG. 4 relates to the invention of claim 2. This embodiment is basically the same as the first embodiment, but differs in the formation of slits. That is, two slits 7 are formed in the tapered portion 6 of the fastening member 3 so as to face each other, and a slit 8 in the direction perpendicular to the shaft hole 4 is formed in a half circumference at a boundary portion between the tapered portion 6 and the locking portion 5. It is formed over. The specific form (length, number, etc.) of the slit 8 perpendicular to the shaft hole is set in consideration of the tightening strength, the breaking strength at which the locking portion 5 can be taken, and the like, and a plurality of slits are intermittently provided. It can also be provided.

The method of using the lock nut of this embodiment is the same as that of the first embodiment. Further, although there are two slits parallel to the axis, the slit 8 is formed in the direction perpendicular to the axis, so that elastic deformation of the taper portion can be easily obtained. Since the lock nut has a slit 8 formed at right angles to the shaft,
When a strong torque is applied during tightening, the slit 8 part is broken and the locking part 5 is removed. However, when used in a place where disassembling is not considered, such as fixing the steel frame of a building, the lack of the locking part does not hinder. By the way, in the loosening prevention nut of this form, when it was used under a bolt diameter of 10 mm and a pitch of 1.5 mm, 800 kgf.
The slit 8 part broke with a rotational torque of cm, but
When vibration was applied for a minute, no looseness was observed. The return torque at this time is 1000 kgf. c
m.

[0013]

Third Embodiment FIG. 5 relates to the invention of claim 3. That is, one slit 7 parallel to the shaft hole 4 is provided over the entire length of the fastening fitting 3. The method of using the tightening fitting 3 is the same as that of the first embodiment,
Further, by providing a slit perpendicular to the shaft hole, it can be used as in the second embodiment.

[0014]

Fourth Embodiment FIGS. 6 and 7 relate to the invention of claim 4. Through hole 12 is formed in receiving metal fitting 11,
The through hole 12 is formed with a female screw 14 on the tip side of the bolt (upper side in the drawing) to be screwed into the tightening fitting 13, the bolt head side is a tapered hole 15, and the tapered hole 15 has a large diameter on the bolt head side. . Tightening fitting 1 in this through hole 12
3 is fitted. The outer shape of the receiving fitting 11 is hexagonal in cross section so that a rotary tool such as a spanner can be locked. The tightening metal fitting 13 has a flat hexagonal locking portion 13b on the head of a main body 13a having a shaft hole 16 in which a female screw for screwing a bolt is formed at the center so that a rotary tool such as a spanner can be locked. It is fixed by a pin 21. The portion of the receiving metal fitting 11 fitted into the through hole 12 is formed with a male screw 18 which is screwed into the female screw 14 of the receiving metal fitting 11 on the locking portion 13b side, and the tip end side of the receiving metal fitting 11 is formed.
The taper portion 19 has an inclination angle slightly larger than that of the taper hole 15. The tapered portion 19 has four slits 20 formed at intervals of 90 degrees.
Is elastically deformable in the direction of the shaft hole 16. The taper portion 19 has such a size that the tip of the taper portion 19 does not protrude from the lower surface of the receiving metal fitting 11 when the tightening metal fitting is tightened to the limit.

The locking nut constructed as described above is
With the external thread of the tightening fitting 13 screwed onto the female thread of the receiving fitting 11, the tightening fitting 13 is screwed onto the bolt C inserted into the tightening objects A and B. At the time of screwing, the receiving metal fitting 11 is rotated and tightened. After the end surface of the receiving metal fitting 11 is pressed against the tightening object, when the tightening metal fitting 13 is rotated in the reverse direction (loosening direction), the tapered portion 19 of the tightening metal fitting 13 is narrowed by the tapered hole 15 of the through hole 12 of the receiving metal fitting. Deforms in the bolt direction. That is, the inner wall of the tapered portion of the fastening member 13 presses the peripheral wall of the bolt C from the surroundings, and the inner wall of the tapered portion presses against the peripheral wall of the bolt C.

Therefore, the bolt C is fixed by the pressure bonding between the lower surface of the receiving metal fitting 11 and the tightening object B, and also by pressure bonding around the bolt by the taper portion 19.
A large anti-loosening effect against vibration can be obtained. In the above embodiment, when the tightening metal fitting of the taper part 6 is tightened to the limit, the tip end of the taper part 6 is the receiving metal fitting 1.
Since it has a size that does not protrude from the lower surface of the, the vibration of the tightening object is not directly transmitted to the tightening fitting, and the seismic effect is further improved.

When loosening the bolt, the tightening metal fitting 1
When 3 is rotated in the tightening direction, the tightening of the tapered portion 19 is released, so that the receiving metal fitting 11 can be easily rotated in the opposite direction to remove the nut.

Further, since the locking nut of this embodiment can be fixed without pressing the receiving metal fitting to the tightening object, it is effective for fixing a spring receiver, for example. That is, when the receiving metal fitting 11 screwed to the bolt is rotated and the receiving metal fitting 11 reaches a predetermined position, the fastening metal fitting 13 is rotated in the opposite direction without rotating the receiving metal fitting 11. By the reverse rotation of the tightening fitting 13, the taper portion 1
Since 9 is crimped to the bolt, the nut can be fixed at any position.

In this embodiment, the tightening metal fitting is used as the main body 1
Although the two-member configuration of 3a and the engaging portion 13b is adopted, the end portion of the main body 13a may be cut so that a spanner or the like can be engaged without forming the engaging portion separately. Also, slit 2
It is also possible to provide one 0 for the entire length of the body 13a of the fastening fitting. Further, in each of the embodiments, all the locking portions of the rotary tool have a hexagonal cross section, but it is sufficient if there are two parallel surfaces.

[0020]

According to the present invention, the combination of the receiving fitting having the tapered surface and the fastening fitting makes it possible to elastically deform the fastening fitting and press the peripheral wall of the bolt from the surroundings. Therefore, the bolt and the nut are in a very tightly pressed state, and the two are substantially integrated with each other, so that great seismic resistance and anti-loosening effect can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is likewise an exploded perspective view.

FIG. 3 is a sectional view of the same in use state.

FIG. 4 is a perspective view of a tightening fitting according to the second embodiment of the present invention.

FIG. 5 is a perspective view of a tightening fitting according to a third embodiment of the present invention.

FIG. 6 is a sectional view of embodiment 3 of the present invention.

FIG. 7 is a sectional view of the same in use state.

[Explanation of symbols]

 1 Receiving metal fitting 2 Through hole 3 Tightening metal fitting 4 Shaft hole 5 Locking part 6 Tapered part 7 Slit 8 Slit 11 Receiving metal fitting 12 Through hole 13 Tightening metal fitting 13a Tightening metal fitting 13b Tightening metal fitting locking part 14 Female screw 15 Tapered hole 16 Shaft hole 18 Male thread 19 Tapered part 20 Slit A Tightening object B Tightening object C Bolt

Claims (5)

[Claims] 1. A receiving fitting having a tapered through hole,
The bolt includes a shaft hole having a female thread to be screwed into the bolt, and a tightening metal fitting having a tapered outer surface corresponding to the through hole of the receiving fitting, and the fitting fitting tightly fitted to the receiving fitting. The head side has a small diameter, the base end of the tightening metal fitting is shaped so that a rotary tool can be locked, a slit parallel to the axis is formed at the end, and the shaft hole peripheral wall of the tightening metal fitting is crimped to the bolt peripheral wall. Lock nut configured to 2. The locking nut according to claim 1, wherein the tightening fitting has a slit formed at a base portion of an outer surface of the taper, the slit being perpendicular to the axis. 3. The lock nut according to claim 1, wherein the number of the slits is one and the slits are formed over the entire length of the tightening fitting. 4. A metal fitting having a tapered through hole,
The through hole of the receiving metal fitting has a shaft hole formed with a female screw to be screwed into a bolt, and a tightening metal fitting that has a tapered outer surface corresponding to the through hole of the receiving metal fitting and is tightly fitted to the receiving metal fitting. , The bolt tip side is a non-tapered part formed with a female screw to be screwed into the tightening metal fitting, and a taper part having a large diameter on the head side of the bolt is formed continuously with the non-tapered part. The outer surface is shaped so that the rotary tool can be locked, the tightening fitting is formed with a slit parallel to the shaft, and the proximal end of the tightening fitting is shaped so that the rotary tool can be locked. Lock nuts configured so that the peripheral wall crimps against the bolt peripheral wall 5. The size of the receiving metal fitting and the tightening metal fitting is
4. The size of the tip of the tightening fitting does not protrude beyond the tip of the receiving fitting when tightened.
The lock nut according to any one of