JPH071323U - Bolt co-rotation prevention structure. - Google Patents

Abstract

(57) [Summary] [Purpose] A structure to prevent co-rotation of bolts when connecting nuts. [Structure] A V-groove and a ridge are provided on the inside of the bolt head and the washer or washer of the battledore bolt to be joined thereto, and the bolt is fitted and locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bolt co-rotation preventing structure which is generally used as a fixing element member.

[0002]

[Prior art]

 The fastening and fixing means using bolts and nuts as fixing metal fittings is generally used as a mechanical element for various industries. However, when fastening nuts to bolts and fastening various joint materials, as shown in FIG. When the joint material t is fixed with the bolt V and the nut n, the bolt head 1 is usually moved along with the rotation of the nut and is troublesome to fix. It is fastened to V. Alternatively, as an alternative means, a bolt has been proposed in which a protrusion or a ridge is provided on the inside of the head of the bolt to lock it with a washer or a joint member to prevent co-rotation. However, if the washer or fitting that locks the protrusion or ridge on the inside of the bolt is a metal material, the protrusion or ridge provided on the inside of the bolt or the ridge is locked by the Holt sliding on the metal washer surface when the nut is connected. There is a drawback that it is not practical as a structure that prevents the nut and the bolt from rotating together due to insufficient action.

[0003]

[Problems to be solved by the present invention]

 In order to solve the above-mentioned difficulties, it is desired that the inner surface of the bolt and the washer surface be integrally connected to each other to prevent the bolt from rotating together when the nut is connected.

[0004]

[Means for Solving the Problems]

 As a means for eliminating the above, a groove or a recess is provided on the inner tightening surface of the bolt head, and a ridge or a projection with which the groove or the recess is fitted and locked on a washer surface joined to the inside of the bolt head. Provided as a means for preventing co-rotation of the bolt.

[0005]

[Operation] Since the projection or the projection of the washer surface to be joined to the groove or the recess inside the head of the bolt is fitted and locked, the bolt connected to one end of the bolt is rotated. Is prevented from co-rotating with the nut.

[0006]

【Example】

 (1) The V groove 3 is provided on the inner surface of the head 2 of the bolt 1. The V-groove 3 may be an appropriate groove or recess. Reference numeral 4 is a washer that is joined to the head of the bolt 1, and 5 is a ridge on the washer surface that is provided so as to be fitted and locked in the V groove 3 inside the bolt head 2. As shown in FIG. 3, one or more V-shaped grooves are provided radially from the bolt axis. The ridge 5 may be an appropriate number of protrusions. (Not shown).

(2) As another embodiment, as shown in FIGS. 5 and 6, a V groove 10 is provided inside the bolt 9 that is fastened to the bolt hole 8 of the plate washer 7 of the battledore plate bolt 6, and the plate washer 7 is provided. If the bolts 9 are fitted and locked to the plate washer 7 by the V-grooves and the ridges on the plate washer 7, the battledore bolt 6 and the nuts will not move even when the battledore bolt 6 is rotated and fastened by coupling the nut 12. There is no turning around.

[0008]

【effect】

 As described above, the co-rotational action that occurs when the nut of the bolt is attached is due to the provision of the groove and the projection or ridge that is fitted and locked in the groove on the joint surface of the bolt head and the washer joined to the bolt head of the present invention. It can be easily resolved and is extremely effective in improving workability. Needless to say, the fastening structure of the bolt and the washer is not limited to the embodiment of the present invention, and the design can be changed appropriately.

[Brief description of drawings]

FIG. 1 is a view showing a bolt and a washer fitted to the bolt.

FIG. 2 is a perspective view showing a bolt, a washer, and a nut coupled to the bolt and the washer.

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

FIG. 4 is a plan view of a washer.

FIG. 5 is a combination diagram showing a battledore bolt, a nut coupled to the battledore bolt, and a mounting bolt mounted on a washer of the battledore bolt.

FIG. 6 is a plan view of a battledore bolt.

FIG. 7 is a view showing a conventional bolt and nut coupling.

[Explanation of symbols]

 1 Bolt 2 Head 3 V groove 4 Washer 5 Projection 6 Loose plate bolt 7 Plate washer 8 Bolt hole 9 Bolt 10 V groove 11 Projection 12 Nut

Claims (1)

[Scope of utility model registration request] 1. A ridge or a protrusion provided with a groove or a recess on an inner tightening surface of a bolt head, and a washer surface joined to the inner tightening surface of the bolt head, which is fitted and locked in the groove or the recess. A structure for preventing the co-rotation of the bolt, which is characterized by being provided with a portion.