Nut loose-proof anti-theft device

Abstract

Spiral wedge locking nut anti-loosening anti-theft device is composed of a thin-walled sleeve, a circular screw washer and a spiral wedge. The inner hole of the bottom of the thin-walled sleeve is provided with a spiral surface for about one week. There is a through opening, so that the spiral surface at the bottom of the cylinder can press the spiral wedge against the inner hole cone surface of the circular screw washer, and the gap at the front end of the spiral surface can withstand the tail of the large end of the spiral wedge. There is an interference fit between the inner hole of the big end of the barrel and the outer circle of the circular screw washer, so the thin-walled sleeve can connect the spiral wedge and the circular screw washer into one. As long as the initial position of the spiral wedge installation is controlled, they can be smoothly screwed together on the bolts and nuts to be protected, and the installation is very convenient without special tools. When the device is reversed counterclockwise, the helicoid notch in the thin-walled sleeve is disengaged from the tail of the large end of the spiral wedge. At this time, the incomplete thread crest in the circular screw spacer is pressed against the spiral wedge. The larger the reverse angle of the device on the bolt, the better the locking effect, and the purpose of anti-loosening and anti-theft of the nut is achieved.

Description

Technical field [0001] The invention relates to an anti-loosening and anti-theft device for a nut, in particular to an anti-loosing and anti-theft device for a screw wedge locking type nut. Background technique [0002] Since the screw wedge lock nut anti-loosening anti-theft device was first published in 1991 (see Chinese patent document 91220429.X nut anti-loosening anti-theft device), after 1995 (see Chinese patent document 95240393.5 nut anti-loosening anti-theft device and its special wrench ), 1999 (see Chinese patent document 99227349.8 nut anti-loosening anti-theft assembly and special installation tools for loading and unloading) several improvements and improvements, it does not change the standard bolt and nut structure, does not weaken the mechanical strength of threaded fasteners, the anti-loose and anti-theft structure is simple and performance The advantages of stability are well received by users. However, its insurmountable disadvantage is troublesome installatio...

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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