JP2022122222A - Hardly-loosening but - Google Patents

Abstract

To manufacture a screw which avoids a cost increase greater than that of a normal screw, hardly loosens by a nut in as the same level as that of the normal screw, and is easily removed.SOLUTION: A clearance is formed in a portion having a cut shape after screwing a nut thereto by molding or cutting a part of a nut inner surface to the cut shape. An inverse-screw tapping machine screw which is inverted to a screw of a bolt nut is inserted and screw-wedged to a portion of the clearance as a wedge for the prevention of the loosening of the nut. Since the tapping machine screw of the wedge rotates so as to be fastened by the rotation of the nut which causes the loosening of the screw, the tapping machine screw is not removed, and the nut is not loosened. A bolt and a washer can be used as before, and the screw which does not cause a cost increase, is not loosened, and easily removed is manufactured.SELECTED DRAWING: Figure 1

Description

The present invention relates to a nut that is difficult to loosen.

Conventional loosening-preventing screws include special processing of washers and nuts, and simultaneous processing of left and right threads on the threaded portion of a bolt to prevent loosening using special nuts. Another idea is to process the bolt and wedge the wedge to prevent it from loosening.

Patent application 2018-248953

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However, all of the above techniques have the problem of being difficult to process and costly compared to ordinary screws. Therefore, an object of the present invention is to produce a screw that is equally hard to loosen and is hard to loosen only by processing a nut and wedging a wedge to prevent loosening without increasing the cost to a greater extent than a normal screw.

In order to solve the above problems, the present invention forms or grinds a part of the inner surface of the nut into a cut shape, and creates a gap in the cut shape after tightening the nut. In order to prevent loosening of the nut, a tapping screw with a reverse thread that rotates in the opposite direction to that of the bolt and nut is inserted into the gap and screwed into the gap.

According to the present invention, a part of the inner surface of the nut is cut, and a counter-rotating tapping screw for a wedge is inserted and screwed into the gap between the cut parts after tightening the nut. By wedging, the tapping screw of the wedge prevents the nut from loosening, so the nut will not loosen and the screw will not loosen.

The tapping screw for the wedge is reverse threaded, and when the nut is rotated to loosen, the tapping screw that is in close contact with the nut rotates to tighten, so it is difficult to come off.

It is a perspective view showing one embodiment of this invention.

An embodiment of the invention is shown in FIG.
A part of the inner surface of the nut is molded or cut into a cut shape so that a gap is formed in the cut shape after tightening the nut. In order to prevent loosening of the nut, a tapping screw with a reverse thread that rotates in the opposite direction to that of the bolt and nut is inserted into the gap and screwed into the gap.

"Effect of embodiment"
Only by cutting a part of the inner surface of the nut and inserting a reverse threaded tapping screw into the wedge and wedging it, it is possible to create a screw that is equally hard to loosen without increasing the cost as much as a normal screw. can be created.
The thread of the tapping screw for the wedge is a reverse thread that rotates in the opposite direction to that of the bolt and nut. Not easy to come off.
When removing the nut, it can be easily removed by removing the tapping screw.

"other embodiments"
In the embodiment of FIG. 1, the shape and size of the cut part of the inner surface of the nut and the size of the tapping screw attached for the wedge are not specified, but are set according to the purpose of use and manufacturing circumstances. .

In the embodiment of FIG. 1, materials such as tapping screws attached for nuts and wedges are not particularly specified, but they are not limited to metals and may be plastics or the like. Also, a combination thereof may be used.

Although only one nut is provided in the embodiment of FIG. 1, the nut of the present invention may be attached as a double nut on top of a normal nut.

In the embodiment of FIG. 1, the tapping screw attached for the wedge is a tapping screw with a reverse thread, but the cost may be reduced without using a reverse thread. Although it will be difficult to remove, you can rivet it.

In the embodiment of FIG. 1, one wedge is provided, but a plurality of wedges may be provided.

1 nut 2 clearance 3 tapping screw 4 bolt

Claims (1)

A nut in which a part of the inner surface of the nut is cut to provide a gap, and a tapping screw with a reverse thread can be inserted into the gap to prevent loosening.

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