Anti-loosening anti-theft nut

Abstract

Spiral wedge locking anti-loosening and anti-theft nut consists of a chamfered nut (1), a spiral wedge (2) and a thin-walled sleeve (3). The inner hole of the chamfered nut (1) is a through-through standard triangular internal thread. Its shape is hexagonal, and the outer surface of one end is a cylindrical boss. There is a tapered inner hole formed by chamfering in this end. The large hole end of the thin-walled sleeve (3) and the cylindrical boss of the chamfered nut (1) There is an interference fit between the tables. There is an inner helicoid at the end of the small hole for about one week. There is a through opening at the front end. The helical wedge (2) resides on the cone surface of the inner hole of the chamfered nut (1), and is formed by the thin-walled sleeve (3 ) The helical surface at the bottom of the cylinder is compressed and fixed, and the front end gap of the helical surface is just in time against the tail portion of the large end of the spiral wedge (2). When the double anti-nut retreats, the incomplete internal thread crest on the inner cone surface of the chamfered nut (1) presses the outer periphery of the spiral wedge (2), eliminating the gap between the nut and the bolt, and achieving anti-loosening and anti-theft the goal of. The invention integrates the functions of nut fastening, anti-loosening and anti-theft. It solves the problems that the connecting bolts of the iron tower and the communication microwave tower are loose and stolen, and the screw wedge is easy to fall off during installation.

Description

technical field [0001] The invention relates to an anti-loosening and anti-theft nut, in particular to a screw wedge locking type anti-loosening and anti-theft nut, which belongs to the technical field of machinery. Background technique [0002] Since the screw wedge locking nut anti-loosening anti-theft device came out in 1991 (see Chinese patent document 91220429.X), it was improved in 1995 (see Chinese patent document 95240393.5) without changing the standard bolt and nut structure, and without weakening the thread tightness. The mechanical strength of the firmware, the anti-loose and anti-theft structure is simple, and the advantages of stable performance are welcomed by the majority of users. However, its insurmountable disadvantage is that it is troublesome to install, especially the spiral wedge, which is very inconvenient to install due to its small size. Because the spiral wedge locking type nut of original design is to be combined with a hexagonal nut (hereinafter...

AI Technical Summary

Problems solved by technology

Since you must take off your gloves when installing the spiral wedge, you can clamp the spiral wedge into the spiral groove of the bolt with bare hands. Once the weather is cold and the outdoor temperature reaches tens of degrees below zero, the installer must not wear it on the iron tower in the field. Gloves are difficult to install

In addition, the spiral wedge is small in size and light in weight. It slips out of the hand when it is installed, and it is difficult to find it if it is lost from the iron tower or microwave communication tower.

Although experts in the past ten years have agreed that the double anti-nut has an ingenious concept and reliable anti-loosening and anti-theft performance, but its cumbersome installation procedures and clumsy installation tools have greatly restricted its wide application and promotion.

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