JPS6327132Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bolt detent device.

(Prior art) As a bolt detent device, there are known devices in which a retaining member such as a spring washer with a cutout is attached to the male threaded portion of the bolt, or a device in which the coefficient of friction between the threaded portion of the bolt and nut is increased. However, in the former case, the retaining member may deform during tightening and may not be able to provide sufficient detent function, and in the latter case, the threaded part of the bolt or nut may be damaged once it is used. The problem is that it cannot be reused.

(Purpose of the invention) The present invention has been completed with the aim of solving the above-mentioned problems and providing a reusable bolt detent device that has an excellent detent function.

(Structure of the invention) The present invention involves screwing a nut onto a bolt that has a threaded hole at the shaft end of the bolt main body that has a thread opposite to the male threaded part of the bolt main body, and one end of the bolt has a male threaded part in the threaded hole of the bolt main body. The nut is characterized in that the male screw part of a substantially U-shaped stopper having a stopper part at the other end is screwed into the stopper part, and the stopper part is brought into contact with the end surface of the nut.

(Example) Next, the illustrated embodiment will be described in detail.

Reference numeral 1 denotes a bolt, and the bolt 1 has a bolt main body 2 having a male threaded portion 3 formed in the shaft portion continuing from the head, and a screw hole 4 having a thread opposite to that of the male threaded portion 3, that is, the thread direction is opposite to the male threaded portion 3, at the shaft end of the bolt body 2. A nut 5 is screwed onto the male threaded portion 3 of the bolt 1. Reference numeral 6 denotes a substantially U-shaped stopper formed by bending a metal wire, and the stopper 6 has one end formed into a male threaded part 7 corresponding to the female threaded part of the screw hole 4, and the other end as a stopper part 8. and insert the male threaded portion 7 into the threaded hole 4.
The stopper portion 8 is brought into contact with the end surface of the nut 5 by screwing into the nut 5.

When using a device configured in this way,
At the same time, the approximately U-shaped clasp 6 screwing the male threaded portion 7 at one end into the screw hole 4 provided at the other end of the bolt main body 2 is unscrewed, and the nut 5 screwed onto the bolt 1 is also unscrewed. The bolt 1 is inserted into a predetermined bolt hole 12 provided in the tightening member 11, and then the nut 5 is screwed into the male threaded portion 3 of the bolt 1 and tightened. The male threaded part 7 at one end of the substantially U-shaped clasp 6 was screwed into the screw hole 4, and the stopper part 8 at the other end of the clasp 6 was brought into contact with the end surface of the nut 5, resulting in the original configuration. In this case, if the nut 5 were to rotate in the loosening direction, the stopper portion 8 at the other end of the substantially U-shaped stopper 6 would come into contact with the end face of the nut 5, and the stopper 6 would also be rotated. It will be driven in the same direction as the nut 5, but the clasp 6
The threaded hole 4 at the shaft end of the bolt main body 2 into which the male threaded portion 7 formed at one end is screwed has an opposite thread from the male threaded portion 3 of the bolt main body 2 into which the nut 5 is screwed. 6 being driven in the same direction as the nut 5, the male threaded portion 7 of the clasp 6 is screwed into the screw hole 4, which increases the pressure of the stopper portion 8 of the clasp 6 in contact with the end surface of the nut 5. As a result, rotation of the nut 5 in the loosening direction is reliably suppressed. Moreover, at this time,
The substantially U-shaped clasp 6 has a large auxiliary effect in strengthening the contact force of the stopper portion 8 against the end surface of the nut 5 by its spring reaction force, and is also U-shaped. The contact position of the stopper part 8 against the end surface of the nut 5 is determined by the bolt main body 2.
If the shaft end is moved away from the center of the screw hole 4, the torque required to loosen the clasp 6 becomes large, which also makes it difficult to loosen the clasp 6.
In this way, the approximately U-shaped catch 6 reliably prevents the nut 5 from rotating in the loosening direction, and as a result the bolt 1 is always reliably stopped. Therefore, in order to release the tightened state, it is sufficient to unscrew the male threaded portion 7 of the stopper 6 from the screw hole 4, and then unscrew the male threaded portion 3 of the nut 5. Since there is no damage to the metal 6, bolt body 2, or nut 5, it can be reused as is without any problem.

(Effects of the invention) As is clear from the above description, the present invention has a unique and simple structure that uses a substantially U-shaped stopper as a member, and can exhibit an excellent bolt detent function. It also has the advantage of being able to be reused because it does not cause damage to bolts, nuts, or clasps, and has great practical value as it solves the problems of conventional bolt detent devices. .

[Brief explanation of the drawing]

The drawing is a partially cutaway front view showing an embodiment of the present invention. 1: Bolt, 2: Bolt main body, 3: Male thread part,
4: Reverse screw hole, 5: Nut, 6: Clasp,
7: Male thread part, 8: Stopper part.

Claims (1)

[Scope of utility model registration request] A nut 5 is screwed onto a bolt 1 which has a threaded hole 4 with a thread opposite to that of the male threaded part 3 of the bolt main body 2 at the shaft end of the bolt main body 2, and one end of the bolt 1 is provided with a threaded hole 4 having a thread opposite to that of the male threaded part 3 of the bolt main body 2. 7 and has a stopper portion 8 at the other end, and the male threaded portion 7 of a substantially U-shaped stopper 6 is screwed into the nut 5 so that the stopper portion 8 is brought into contact with the end surface of the nut 5. Bolt detent device.