Method for preventing fastening piece from being illegally opened, anti-theft fastening piece and special spanner

Abstract

The invention discloses a method for preventing a fastening piece from being illegally opened, an anti-theft fastening piece and a special spanner. The heads of bolts in the fastening piece and the appearances of nuts are all made into cone-cylinder shapes; the special spanner which is used for screwing or opening the fastening piece is made into a shape with a pipe wrench structure; and the holding surface of the special spanner which is used for holding the fastening piece is made into the holding surface with an inclined conical surface structure, so that the inclined conical surface shaped holding surface can be adhered with the cone-cylinder shaped conical surfaces of the heads of the bolts or the nuts while being used for holding the heads of the bolts in the fastening piece or the nuts. The purpose of preventing the fastening piece from being illegally opened can be fulfilled only by using the method for opening or screwing the bolts with the cone-cylinder shaped heads or the fastening piece with the cone-cylinder shaped appearance through the special spanner. The anti-theft fastening piece and the special spanner have the advantages of good anti-theft effect, simple structures, easiness in manufacture, low manufacturing cost and convenience in usage.

Description

technical field [0001] The invention relates to a method for preventing a fastener from being stolen and opened, an anti-theft fastener and a special wrench, and belongs to the technical field of anti-theft fasteners. Background technique [0002] In the infrastructure of communication, electric power, and railway, a large number of screws and nuts are used for fastening. Because ordinary nuts are easy to unscrew, incidents of theft of facilities locked with ordinary screws and nuts often occur. In order to solve this problem, many technical solutions for preventing fasteners from being stolen have been proposed in the prior art. In this technical scheme, the nut or bolt head is made into a cone-shaped structure, that is, a part of the side of the nut or bolt head is made into a continuous conical surface, and the remaining part is made into a continuous conical surface formed by two or more conical surfaces. In this way, the anti-theft special-shaped bolt cannot be opened ...

AI Technical Summary

Problems solved by technology

In order to solve this problem, many technical solutions for preventing fasteners from being stolen have been proposed in the prior art, such as the technical solution disclosed in the Chinese patent literature with the application number 2010202667407 and the title of the invention "a kind of anti-theft special-shaped bolt". In this technical solution, the nut or bolt head is made into a cone-shaped structure, that is, a part of the side surface of the nut or bolt head is made into a continuous conical surface, and the remaining part is made into a continuous cone formed by more than two conical surfaces. In this way, the anti-theft special-shaped bolt cannot be opened with ordinary pipe wrench, but can only be opened with a special wrench.

Although the special-shaped bolt of this structure has a certain anti-theft function, it has the problems of complex structure, difficult manufacture, and high manufacturing cost, especially its patented wrench adopts a completely different structure from the conventional pipe wrench, so its manufacturing cost is higher. High; and because of the continuous cone surface structure adopted by the existing special-shaped bolts, there is an angle at the junction of the cone surface and the cone surface, and the angle part is easy to be hit, so that the bolt or nut produce looseness, so the anti-theft effect of the existing structural fasteners is not very good

Therefore, the use effect of existing existing anti-theft fasteners is still not ideal enough.

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