JPH0743478Y2 - Bolt with locking device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt provided with a locking device for preventing loosening. More specifically, the bolt is completely tightened by pushing the built-in locking piece in the axial direction. The present invention relates to a bolt with a locking device that can be locked.

[0002]

2. Description of the Related Art In general, bolts for tightening objects need to be easily tightened after tightening. In particular, when used in a place subject to severe vibration or impact, another loosening prevention device is required in addition to the usual tightening.

As a general means for preventing loosening of embedded bolts, means such as a flat washer, a spring washer or a toothed washer, a means for stopping the rotation with a set screw, a means for using rubber and the like are conventional means. However, in each case, strong locks could not be expected.

Therefore, the applicant of the present application provided a vertical division in the threaded portion of the bolt, provided a tapered hole in the central portion, and provided a tapered pin that moves axially by a screw into the tapered hole, thereby forming a double screw system. A bolt with a locking device has been devised, in which the threaded portion of the bolt is expanded in the radial direction by the axial movement of the taper pin which is moved by the method described in Japanese Utility Model Publication No. 2-45528.

[0005]

However, the bolt with a locking device devised above is capable of a firm lock, but it is difficult to secure the bolt strength because it is made by vertically dividing the thread portion of the bolt. During locking operation, it takes a lot of time to rotate the taper pin to move it in the axial direction, it is not possible to lock it quickly, and it tends to expand in the radial direction and return poorly. There is a problem to be solved in that the insertion into the hole becomes hard and the workability is reduced.

An object of the present invention is to provide at low cost a bolt with a locking device which can be firmly locked by simple processing and operation without lowering the strength of the bolt.

[0007]

DISCLOSURE OF THE INVENTION The present invention has a turning portion 1 and a screw portion 2 for tightening, a lock piece actuating shaft hole 3 is provided at the center thereof, and a tip end portion thereof is in a radial direction. A bolt body 5 having a lock piece fitting hole 4 formed therein and a lock piece actuating shaft hole 3 are rotatably supported, and a tip end portion corresponding to the lock piece fitting hole 4 is an eccentric shaft 6. It is characterized in that it comprises a lock piece actuating shaft 8 having a rotating portion 7 for locking on the head and a lock piece 9 fitted in the lock piece fitting hole 4 so as to be retractable. The gist is a bolt with a locking device.

[0008]

According to the bolt with a lock device constructed as described above, when the lock piece operating shaft 8 is rotated a half turn, the eccentric shaft 6 is rotated.
As a result, the lock piece 9 is pushed out in the radial direction and is pressed against the female threaded portion of the member to be fastened, and at the same time, the threaded portion of the bolt body 5 is crimped to the opposite side of the lock piece 9 to lock it. To form.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bolt with a locking device according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded sectional view, FIG. 2 is a sectional view in a state of being mounted on a member to be fastened, and FIG. A-
FIG. 4 is a cross-sectional view taken along line A, which includes a bolt body 5, a lock piece operating shaft 8 and a lock piece 9.

The bolt body 5 has a hexagonal head rotating portion 1 and a screw portion 2 for tightening, and a lock piece operating shaft hole 3 in which a female screw 10 is engraved at the center and a hole 3 for connecting the lock piece operating shaft. An eccentric shaft accommodating hole 11 is provided so as to penetrate therethrough, and a lock piece fitting hole 4 is formed at the tip of the screw portion 2 in the radial direction communicating with the eccentric shaft accommodating hole 11.

Further, the lock piece operating shaft 8 is provided with the female screw 10 described above.
An eccentric shaft 6 corresponding to the lock piece fitting hole 4 is formed continuously with a male screw shaft 12 that is screwed with, and a rotary support shaft 13 concentric with the male screw shaft 12 is formed at the tip of the eccentric shaft 6. The lock rotation portion 7 is formed by a hexagon wrench hole.

Further, the lock piece 9 has a barbed retaining edge 16 (see FIG. 3) on the inner side, and is fitted into the lock piece fitting hole 4 of the bolt body 5 from the inside of the eccentric shaft accommodation hole 11. It is adapted to be assembled and fitted so as to be able to project and retract freely, and a thread 14 of a lead that is the same as or similar to the threaded portion 2 of the bolt body 5 is formed on the outer surface.

When the bolt with a lock device according to the embodiment configured as described above is used, the lock piece is formed by a lead in which the thread 14 of the lock piece 9 matches or approximates the thread of the thread portion 2 of the bolt body 5. Since it is held in the fitting hole 4,
Similar to the normal bolt closing work, the bolt is fastened to the female screw portion 16 of the member to be fastened 15 with the tool corresponding to the rotating portion 1.

When tightening is completed, the lock piece operating shaft 8 is half-turned by a hexagonal wrench or the like matching the lock rotating portion 7, and the lock piece 9 is pushed out in the radial direction by the eccentric shaft 6 to tighten the tightening member. 15 is pressed, and by the reaction thereof, the opposite side of the threaded portion 2 of the bolt main body 5 is crimped to the tightening member 15 to form a locked state.

When the bolt body 5 is loosened, if the lock piece actuating shaft 8 is rotated half a turn in the opposite manner to the above, the pressing of the lock piece 9 by the eccentric shaft 6 is released and the load is lost. Rotate in the direction to loosen.

In the above embodiment, the thread 14 is formed on the surface of the lock piece 9, but the outer shape may be a thread bottom, and the lock actuating shaft 8 is a straight shaft having no screw and is rotated. You may make it hold | maintain with a snap ring etc. so that only that is permitted.

[0017]

The bolt with a lock device of the present invention described above has a rotating portion 1 and a screw portion 2 for tightening, a hole 3 for a lock piece operating shaft is provided at the center, and a tip portion is provided. A bolt body 5 having a lock piece fitting hole 4 formed in the radial direction,
An eccentric shaft 6 is rotatably supported in the lock piece actuating shaft hole 3, and a tip portion corresponding to the lock piece fitting hole 4 is an eccentric shaft 6.
The lock piece actuating shaft 8 having the lock turning portion 7 on the head portion and the lock piece 9 which is fitted in the lock piece fitting hole 4 so as to be retractable and retractable. The lock piece 9 is locked by the eccentric shaft 6 with a simple operation of only half rotation
Is pushed out in the radial direction, and this is pushed against the female screw portion of the member to be fastened, and at the same time, the screw portion of the bolt body 5 is crimped to the opposite side of the lock piece 9, so that a strong locked state can be formed. .

Further, since the bolt main body 5 has only the lock fitting hole 4 and is not vertically divided as in the conventional case, the elastic expansion force of itself is not necessary, and the lock tightening is stable with little resistance. It is also possible to obtain excellent strength. Further, in the conventional type in which the threaded portion is enlarged by the taper pin, there is a tendency that it is enlarged in the radial direction and the return is bad, so that it is hard to insert it into the threaded hole at the time of reuse. Since the portion 2 is not deformed and is stable, it can be easily inserted when it is reused.

Further, since the lock piece can be locked by half rotation of the operating shaft 8, it can be mounted on a bolt having a short length of the under neck screw.

[Brief description of drawings]

FIG. 1 is an exploded sectional view of an embodiment of a bolt with a locking device according to the present invention.

FIG. 2 is a cross-sectional view of a bolt with a locking device according to the present invention mounted on a member to be fastened.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Rotating part 2 Screw part 3 Lock piece operating shaft hole 4 Lock piece fitting hole 5 Bolt body 6 Eccentric shaft 7 Locking rotating part 8 Lock piece operating shaft 9 Lock piece 10 Female screw 11 Eccentric shaft accommodating hole 12 Male screw Shaft 13 Rotating support shaft 14 Screw thread 15 Fastened member

Claims (3)

[Scope of utility model registration request] 1. A turning piece 1 for tightening and a threaded portion 2, a lock piece operating shaft hole 3 is provided at the center, and a lock piece fitting hole 4 is provided at the tip end portion in the radial direction. It is rotatably supported in the drilled bolt body 5 and the lock piece actuating shaft hole 3, and the tip end portion corresponding to the lock piece fitting hole 4 is an eccentric shaft 6, and the head part has a locking screw. A lock-equipped bolt comprising a lock piece actuating shaft (8) having a moving part (7) and a lock piece (9) fitted in the lock piece fitting hole (4) in a retractable manner. 2. The lock device according to claim 1, wherein the lock piece operating shaft 8 is a male screw shaft 12 except for the eccentric shaft portion 6, and the corresponding lock piece operating shaft hole 3 is a female screw 10. Attached bolt. 3. The bolt with a lock device according to claim 1, wherein the outer surface of the lock piece 9 is formed with a thread 14 of a lead which is the same as or nearly the same as the threaded portion.