Nut loose-proof anti-theft device

Abstract

A helical wedge locking type nut anti-looseness and anti-theft device is disclosed. The invention comprises a thin wall sleeve, a round helical washer, and a helical wedge, a helical surface of about a circle is arranged in the inner hole at the bottom of the thin wall sleeve, a through opening is arranged at the utmost front end of the helical surface, therefore the helical surface at the sleeve bottom can tightly press the helical wedge on the inner hole conical surface of the round helical washer, the notch at the front end of the helical surface can hold against the tail part of the large end of the helical wedge, and because the interference fit is performed between the inner hole of the large end of the thin wall sleeve and the outer circle of the round helical washer, the thin wall sleeve can connect the helical wedge and the round helical washer into a whole body. If the initial position of the installation of the helical wedge can be well controlled, the helical wedge and the round helical washer can be together screwed onto a bolt nut to be protected, and the installation is very convenient, without the help of special-purpose tools. When the device is rotated reversely, the helical surface notch in the thin wall sleeve can be broken away from the tail part of the large end of the helical wedge, the incomplete thread top in the round helical washer presses the helical wedge, and the larger the reverse rotation angle on the bolt of the device is, the better the locking effect is, to reach the purpose of anti-looseness and anti-theft.

Description

technical field [0001] The invention relates to a nut anti-loosening and anti-theft device, in particular to a screw wedge locking nut anti-loosening and anti-theft device. Background technique [0002] Since the screw wedge locking type nut anti-loosening and anti-theft device came out for the first time in 1991 (referring to Chinese patent document 91220429.X nut anti-loosening and anti-theft device), through 1995 (referring to Chinese patent document 95240393. ), in 1999 (see Chinese patent document 99227349.8 nut anti-loosening and anti-theft assembly and special installation tool for loading and unloading) several times of improvement and perfection, it does not change the standard bolt and nut structure, does not weaken the mechanical strength of threaded fasteners, the anti-loosening and anti-theft structure is simple, the performance The advantages of stability are welcomed by users. However, its insurmountable disadvantage is that it is troublesome to install. Bec...

AI Technical Summary

Problems solved by technology

Since the gloves must be taken off during installation, the spiral wedge can be stuck 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, workers are required to install it on the iron tower in the field without wearing gloves. that is difficult

In addition, the spiral wedge is small in size and light in weight, and it is difficult to find it if it slips from your fingers if you accidentally lose it from the iron tower or microwave communication tower.

Although in the past ten years, experts have agreed that this device is ingenious in conception and reliable in 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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