JPH04129914U - Locking device for fasteners - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the periphery of the locking washer from being exposed around the head of the screw. [Structure] A ratchet tightening surface having a required number of equally spaced teeth is provided on the circumference of the back surface of the head of the screw, and the tightening surface is engaged with a washer fitted on the outside of the screw shaft of the screw. In a fastener provided with combined locking teeth, the head 2 of the screw 1
A recessed stepped portion 3 into which the washer 5 is fitted is provided on the back surface, and a tightening surface portion 4 is provided on the bottom surface of this recessed stepped portion.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a locking device for a fastener.

0002

[Conventional technology]

A conventional technique for preventing screws from loosening is disclosed in Japanese Utility Model Publication No. 47-39158. A ratchet with the required number of teeth equally spaced on the circumference of the back of the screw head to A locking surface is provided on the screw, and locking teeth are provided on the washer that fits on the outside of the screw shaft of the screw. At the end of the installation, the locking teeth and the ratchet tightening surface mesh and engage to prevent loosening. It looks like this.

0003

[Problem that the idea aims to solve]

With the above configuration, the periphery of the washer is exposed around the head of the screw, so There was a problem that it became unsightly when used for things such as fillings. In addition, when a pull is attached to the drawer, the handle to be taken out should be attached to the periphery of the washer exposed inside the drawer. There were problems such as the collar and cuffs of clothing getting caught.

0004 Therefore, the challenge with this design was to prevent the periphery of the washer from being exposed around the head. An object of the present invention is to provide a locking device for a fastener.

[0005]

[Means to solve the problem]

In order to solve the above problem, this idea has been developed to create screws with equal intervals on the circumference of the back of the screw head A ratchet tightening surface part with the required number of teeth is provided, and In the fastener in which a washer fitted to the side is provided with locking teeth for engagement of the tightening surface portion, the A recess into which the washer is fitted is provided on the back of the head of the screw, and the bottom surface of this recess is This configuration adopts a structure in which a tightening surface portion is provided on the side.

[0006]

[Effect] Insert the washer fitted on the outside of the screw shaft into the recessed step, and apply it when screwing is completed. The lock teeth and the tightening surface portion are engaged to prevent the screw from loosening.

[0007]

【Example】

Embodiments of this invention will be described below with reference to the accompanying drawings.

[0008] As shown in FIG. 1, an annular recessed step 3 is provided on the back side of the head 2 of the screw 1. There is.

[0009] Further, the bottom surface of the recessed stepped portion 3 is provided with a ring having a required number of teeth equally spaced on the circumference. A check tightening surface portion 4 is provided.

0010 5 is a washer that is fitted on the outside of the screw shaft 6 of the screw 1 and fitted into the recessed step 3; Locking teeth 7 that engage with the tightening surface portion 4 are provided on the plate surface of the washer 5 . The above locking teeth 7 are provided on both sides of the washer 5 so that the locking teeth 7 on one side and the tightening surface portion 4 are The locking teeth 7 are engaged and the other locking tooth 7 is bitten into the mating surface. Note that the locking teeth 7 extend radially from the center and are continuous in a sawtooth shape. Provided by less molding, etc.

[0011] Further, the tightening surface portion 4 is provided in a sawtooth shape like the locking teeth 7 in the illustrated case.

0012 With the above configuration, screws can be inserted into the through holes 12 of the front plate 11 of the drawer as shown in FIG. The screw shaft 6 is passed through and screwed into the recessed hole 14 of the handle 13.

[0013] When the above-mentioned screwing is completed, one side of the locking teeth 7 bites into the back surface of the front plate 11, and In addition, the tightening surface portion 4 of the recessed stepped portion 3 and the locking teeth 7 on the other surface are engaged to prevent the screw 1 from loosening. Stop.

[0014] Note that the peripheral edge of the back surface of the head 2 is close to or in contact with the back surface of the front plate 11.

[0015]

【effect】

As described above, according to the fastener according to this invention, a recessed step is formed on the back surface of the head of the screw. Since the washer is fitted into this recessed step, the washer is fitted around the back side of the screw head. The periphery is not exposed.

[0016] This can lead to unsightly problems and the possibility of objects or clothing cuffs getting caught in the locking teeth. This can eliminate problems such as

[Brief explanation of drawings]

[Figure 1] Partially cutaway front view of the fastener according to this invention

[Fig. 2] Partially cutaway plan view showing the state of use of the same as above.

[Explanation of symbols]

1 screw 2 Head 3 Recessed stepped part 4 Tightening surface part 5 Washer 6 Screw shaft 7 Locking teeth

Claims (1)

[Scope of utility model registration request] Claim 1: A ratchet tightening surface portion having a required number of equally spaced teeth is provided on the circumference of the back surface of the head of the screw, and
In the fastening tool, a washer fitted to the outside of the screw shaft of the screw is provided with locking teeth for engaging the tightening surface part, and a recessed step part into which the washer is fitted is provided on the back surface of the head of the screw, and the recess A locking device for a fastener, characterized in that a tightening surface is provided on the bottom of the step.