Flat-top anti-theft anti-damaged screw

An anti-vandal and screw technology, applied in the direction of screws, nuts, bolts, etc., can solve the problems of lack of decorative art effect, criminal theft and damage, etc., and achieve the effect of good anti-theft performance, strong decoration and simple structure.

Inactive Publication Date: 2007-08-29
CHENGDU WENJIANG XINGHUO PATENT DEV RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, known traditional screws are easy to assemble and disassemble, and are also convenient for criminals to steal and destroy; some screws with anti-theft function, such as the anti-theft screws with patent Nos. 0420098372.4 and 02153416.0, lack decorative artistic effects.

Method used

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  • Flat-top anti-theft anti-damaged screw

Examples

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Effect test

Embodiment Construction

[0009] In the figure, the inner screw for fastening together is set, and its shape is a flat-headed conical cap bolt composed of upper and lower concentric screw rods with different diameters, and its cap is embedded in the conical groove of the outer nut (4) , the thicker screw thread in the upper section is a fine-toothed left-handed shallow thread (2) that matches the outer nut. The outer nut is a short-lived nut that only drives the inner screw to fasten. The fine-toothed left-handed female thread (5) matched with the upper screw rod has a locking strength lower than that of the inner screw and the matching nut. When using it, first put the inner screw into the outer nut and tighten it into a set screw. After the combination screw is installed into the lock nut, it is tightened by a wrench. When the rated torque is reached, the thread of the short-lived nut breaks the slippery thread and can only slip on the periphery of the inner screw. The inner fastening screw cannot be...

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Abstract

The invention relates to a bolt part of a fastener, namely a flatheaded anti-theft breaking bolt composed of inner bolt and outer nut, characterized in that: it is set with a fastening inner bolt, namely in shape, a flatheaded conical cap bolt composed of two sections of screw bolts concentric but different in diameter, the cap of the inner bolt is inserted in the conical groove of the outer nut, the thread of the upper thicker section is a fine-pitch levogyrate light thread matching with the outer nut, and the outer nut is a short-lived nut only playing a role of driving the inner bolt to fasten and is of a shape of hex nut, and the middle hole thread of the outer nut is a fine-pitch levogyrate female thread which matches with the upper section of the inner bolt and whose locking intensity is lower than that of the inner bolt and the supporting locked net. In use, firstly placing the inner bolt in the outer nut and screwing closely into a set of combined bolt which is placed in the locked net and then screwed by wrench, and when reaching the rated torque, the thread of the short-lived nut breaks the sliding filament to make it slide only in the periphery of the inner bolt so as to be unable to demount the inner fastening bolt by routine means and tool any more.

Description

technical field [0001] The invention relates to a screw part of a fastener, in particular to an automobile license plate decorative anti-theft screw. Background technique [0002] At present, known traditional screws are easy to load and disassemble, and are also convenient for criminals to steal and destroy; some screws with anti-theft function, such as the anti-theft screws with patent Nos. 0420098372.4 and 02153416.0, lack decorative art effects. Contents of the invention [0003] In order to overcome the above disadvantages, the present invention provides a flat-top anti-theft and anti-destruction screw, which can achieve the purpose of anti-theft and beautiful appearance. [0004] The technical solution of the present invention to solve the technical problem is: a flat-top anti-theft and anti-destruction screw composed of an inner screw and an outer nut. The flat-headed conical cap bolts made of screws with different diameters, the cap is embedded in the conical groo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B41/00F16B35/00B60R13/10
Inventor 张航
Owner CHENGDU WENJIANG XINGHUO PATENT DEV RES INST
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