Method for preventing fastening nut from being stolen, anti-theft nut and special sleeve tool

Abstract

The invention discloses a method for preventing a fastening nut from being stolen, an anti-theft nut and a special sleeve tool. A nut with internal threads is made into a cylindrical nut; when the cylindrical nut and a bolt are connected and fastened together, a washer sleeve with a cover sleeve is arranged on the bolt, and the cylindrical nut is connected to the bolt through the threads and is screwed on the bolt through the special sleeve tool with a one-way needle bearing, so that the cylindrical nut tightly presses the washer sleeve and is covered by the cover sleeve on the washer sleeve; and when the nut is needed to be loosened, another special sleeve tool with the one-way needle bearing in a different rotating direction stretches into an inner hole of the cover sleeve on the washer sleeve and is sleeved on the nut to loosen the nut. The invention has the advantages that: the anti-theft nut is difficult to steal, has a good anti-theft effect and reliable performance, and is convenient to install, maintain and disassemble.

Description

Method for preventing fastening nut from being stolen, anti-theft nut and special sleeve tool technical field The invention relates to a method for preventing a fastening nut from being stolen, an anti-theft nut and a special socket tool, and belongs to the technical field of fasteners. Background technique On the infrastructure of communications, electric power, and railways, a large number of screws and nuts are used for fastening. Because ordinary nuts are easy to unscrew, the theft of screws and nuts is very rampant. Chinese patent 200420085065.2 discloses an anti-theft nut and a special socket wrench. The disclosed anti-theft nut adopts a conical outside, and a convex rib is arranged on the outside, and a positioning groove matching the convex rib is arranged on the inside of the socket wrench. The applicant found that the nut with the above structure has two defects: one is that the convex rib plate on the outside of the nut provides a force point, and the convex rib...

AI Technical Summary

Problems solved by technology

The applicant found that the nut with the above structure has two defects: one is that the convex rib plate on the outside of the nut provides a force point, and the convex rib plate can be supported by an iron braze, and the nut is shaken loose by knocking the iron braze, and then screwed. Open the nut; the second is that the nut is directly exposed outside, and the nut can be forcibly unscrewed by water pipe wrench, wrench, etc.

Some existing anti-theft nuts adopt a structure that cannot be loosened after being tightened. Although it can prevent theft, it cannot replace the damaged fastening facilities. It is not practical enough for the situation that requires regular maintenance and replacement.

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

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