JP2000346035A - Bolt with locking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely keep locking state by consisting of a bolt main body comprising a tapered hole where a penetration hole is enlarged and a slit at a lower end part, an axial bolt with a head part to be inserted into the penetration hole, a cone-shaped piece to be irrotationally fitted into the tapered hole, a detent pin for the axial bolt, and a latching ring thereof. SOLUTION: A bolt main body 1 comprises a penetration hole 7 having an axial bolt 2 passed therein at the center thereof, and provided with a tapered hole 9 at a lower end part thereof and slits 11 at several places in the coordinating direction with the tapered hole 9. When the bolt main body 1 is combined with the axial bolt 2 and a cone-shaped piece 3 and screwed into a female screw body followed by hooking a wrench to a polygonal hole 16 and turning the axial bolt 2 to attain deeper screwing with the cone-shaped piece 3, the cone-shaped piece 3 move upward to enlarge the tapered hole 9 and the lower end part of the bolt main body 1 is farther opened. A pin 4 is then dropped into a position where a vertical groove 17 of the bolt main body 1 is coincided with a vertical groove 18 of the axial bolt 2, and a latching ring 5 is fitted to a horizontal groove 19 of the bolt main body 1 so as to prevent the pin 4 from slipping off. Looseness is thereby never generated even when being mechanically vibrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt with a non-relaxation preventing a screw from returning due to the influence of mechanical vibration or the like.

[0002]

2. Description of the Related Art Conventionally, as a means for preventing a bolt from loosening, a method using a biasing force of a coil spring, a method using a double nut, and a method of expanding a screw portion of a bolt are used. . Examples of the bolt with a relaxation stopper by this expansion include those described in JP-A-7-4417.

[0003] The bolt with a relaxation stopper described in the publication comprises a bolt body having a through hole along the axis and a deformation bolt passed through the through hole. A taper hole is formed in the portion where the through hole gradually expands to the lower end opening, and a slit is provided to allow the lower end to expand. The lower end of the deformation bolt follows the slope of the taper hole. When the nut is screwed into the upper end of the deforming bolt and tightened, the lower end of the bolt body expands to a large diameter because the conical piece pushes out the taper hole. .

In order to prevent the deformation bolt from rotating at the same time as the rotation of the nut, the conical piece is provided with a notch which is hooked on the slit of the taper hole, and the nut touches another object. A nut recess is formed in the head of the bolt body so as not to cause such a situation.

[0005]

According to the above-mentioned conventional bolt with a locking device, the nut of the deformed bolt is inevitably loosened when it is subjected to mechanical vibration. The piece causes loosening of the inner peripheral surface of the taper hole, which causes the lower end portion of the bolt body to expand and return, so that the intended purpose cannot be achieved.

The present invention has been made in view of the above-described circumstances,
An object of the present invention is to provide a bolt with a loosening stopper which does not release a force for pushing a taper hole of a bolt body with a conical piece so that a screw of a shaft bolt as a deforming bolt does not loosen.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bolt body having a tapered hole formed at a lower end portion with a central through-hole gradually expanding and a slit formed to allow the expansion. A shaft bolt with a head to be inserted into the through hole, a conical piece of a female screw into which the shaft bolt is screwed and non-rotatably fitted into the taper hole, and a pin for preventing rotation of the shaft bolt; It consists of a retaining ring to prevent the pin from coming out.A recess is provided in the head of the bolt body to accommodate the shaft bolt, and the pin is aligned with the inner peripheral surface of the recess and the outer peripheral surface of the shaft bolt head. A plurality of vertical grooves to be dropped are provided so as to be able to conform to small increments, and further, a bolt with a loosening stopper is provided which has a lateral groove into which a retaining ring is fitted on one of its inner peripheral surface and outer peripheral surface. .

[0008] According to the above construction, the conical piece moves upward by tightening the shaft bolt and pushes the taper hole.
The lower end of the bolt body expands. At this time, if the pins are dropped into the corresponding vertical grooves, the return of the shaft bolt is thereby prevented. In addition, the escape of the pin is stopped by the retaining ring, so that the enlarged lower end portion of the bolt body, that is, the loosened state is reliably maintained.

[0009]

In the present invention, the inner peripheral surface of the recess 15 of the bolt body 1 and the head 13 of the shaft bolt 2 are
The vertical grooves 17 and 18 are provided, respectively, and the number thereof varies. However, if one is an even number and the other is an odd number, it is easy to match small steps. Incidentally, in the embodiment shown in FIG. 1, three vertical grooves 17 and eight vertical grooves 18 were used.

Also, the number of the slits 11 that allow the taper hole 9 to be enlarged may be one or more, and it is preferable to provide two or four slits evenly.

Although the illustration of the bolt B with a loosening stopper, that is, the female screw body into which the bolt body 1 is screwed is omitted, the bolt body 1 may be screwed as a whole or partially. There are various types, for example, a part of a machine or a device, a nut, etc., and various forms of use.

[0012]

As described above, according to the present invention, the state in which the tapered hole spreads the taper hole by the rotation of the screw with respect to the shaft bolt is the state of the screw. Since the return is prevented by the pin and the retaining ring, it is possible to exhibit an excellent effect that no slack occurs even when receiving mechanical vibration.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a bolt B with a non-relaxation comprises a bolt body 1, a shaft bolt 2, a conical piece 3, a pin 4, It consists of a combination with a locking ring 5. 6 is a washer for the shaft bolt 2.

The bolt body 1 has a through hole 7 at the center through which the shaft bolt 2 passes, and a lower end of the through hole 7 is tapered.
The lower end portion having the tapered hole 9 is provided with slits 11 at several positions in the isotropic direction. A circular recess 15 is provided at the upper end of the head to accommodate the head 13 of the shaft bolt 2, and a semi-circular vertical shape capable of dropping the pin 4 at three equal positions on the inner peripheral surface of the recess 15. A groove 17 is provided, and at the upper end of the inner peripheral surface,
A lateral groove 19 into which the latch ring 5 fits is provided.

The shaft bolt 2 has a male screw 21 formed at the lower end thereof. Vertical grooves 18 are provided on the outer peripheral surface of the head 13 at eight equal positions. A circular hole into which the pin 4 fits is formed. Also,
The head 13 is provided with a square hole 16 for a wrench.

The conical piece 3 is an inverted-cone-shaped conical shape that fits into the taper hole 9 and forms a female screw 23 into which the shaft bolt 2 is screwed at the center. A projection 25 is provided to project over the slit 11 of the main body 1. The shape of the projection 25 is not particularly limited.

For use, the bolt body 1 is combined with the shaft bolt 2 and the conical piece 3, the bolt body 1 is screwed into a female screw body (not shown), and then a wrench is set in the square hole 16. When the screw with the conical piece 3 is deepened while turning the shaft bolt 2, the conical piece 3 moves upward and pushes the taper hole 9, so that the lower end of the bolt body 1 is expanded. . As a result, unless the screw of the shaft bolt 2 returns, the screw of the bolt body 1 does not return to the male screw body.

Next, in order to prevent the shaft bolt 2 from returning, the pin 4 is dropped into a place where the vertical groove 17 of the bolt main body 1 and the vertical groove 18 of the shaft bolt 2 coincide with each other so that the pin 4 does not come off. And the retaining ring 5 in the lateral groove 19 of the bolt body 1.
Fit.

In some cases, it is necessary to release the locking device. In this case, a cylindrical female screw is used for the pin 4 so that the locking ring 5 and the pin 4 can be easily removed. Used a ring which is partially open and has pores 27 at both ends of the opening.

FIG. 3 shows another embodiment, which is substantially the same as the above-described embodiment, except that, in contrast to the above-mentioned case, the outer peripheral surface of the head 13 of the shaft bolt 2 is provided with a retaining ring. 5 is provided. The head of the bolt body 1 has a concave portion 15 having a vertical groove 17, and further has an extended concave portion 15 a provided thereon, on which the retaining ring 5 is engaged. However, the extended recess 15a may not be provided. In that case, the upper end of the head of the bolt body 1 is at the position P.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a bolt with a relaxation stopper according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an assembled state of the bolt.

FIG. 3 is a sectional view corresponding to FIG. 2 according to another embodiment.

[Explanation of symbols]

 B Bolt with anti-loosening 1 Bolt body 2 Shaft bolt 3 Conical piece 4 Pin 5 Hanging ring 7 Through hole 9 Tapered hole 11 Slit 13 Head 15 Concave 17, 18 Vertical groove 21 Male screw 23 Female screw

Claims (1)

[Claims] 1. A bolt body having a tapered hole having a central through-hole gradually expanding at a lower end thereof, and a slit body formed with a slit for allowing the taper hole to be enlarged, a shaft bolt with a head inserted into the through-hole, A female threaded conical piece into which the shaft bolt is screwed into the par hole in a non-rotatable manner, a pin for stopping the rotation of the shaft bolt, and a retaining ring for preventing the pin from coming out; A recess for accommodating the shaft bolt is provided in the part, and a plurality of vertical grooves into which the pins are dropped to match each other are provided on the inner peripheral surface of the recess and the outer peripheral surface of the head of the shaft bolt so that they can match in small increments Further, a bolt with a non-relaxation feature is provided with a lateral groove in which a retaining ring is fitted on one of the inner peripheral surface and the outer peripheral surface.