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Anti-theft screw

A screw and screw head technology, applied in nuts, bolts, threaded fasteners, etc., can solve problems such as high cost, inconvenient use, and complex structure

Inactive Publication Date: 2003-05-14
唐柳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Screws are the most commonly used mechanical fasteners. In the occasions where objects to be fixed (such as car license plates, etc.) need to be prevented from being stolen and lost, ordinary screws cannot meet the requirements. For this reason, people have invented a variety of anti-theft screws, but they all have complex structures. , so the problem of high cost, some anti-theft screws also need to use special tools, which is inconvenient to use

Method used

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Embodiment Construction

[0009] The anti-theft screw shown in the accompanying drawings is screwed in clockwise, and it includes a screw rod 1, a hemispherical screw head 2, and on the hemispherical screw head 2, it is used to insert a slot 3 of a straight screwdriver. It is characterized in that, in figure 2 The upper half of the left side of the slot shown and the lower half of the right side are two stressed parts respectively an inclined plane or an arc 4, 5. When the slotted screwdriver rotates counterclockwise, the inclined plane or arc 4,5 make the torque of the screwdriver to unscrew the screw lack the action point, and make the screwdriver withdraw from the slot 3 along the inclined plane or the arc surface 4,5. When the screwdriver rotates in the clockwise direction, since the above-mentioned two inclined surfaces or arc surface parts 4, 5 are not stressed, the screw screwing in is not affected. The anti-theft screw adopts a hemispherical screw head 2, which makes it difficult to unscrew th...

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Abstract

The present invention relates to an anti-theft screw capable of being screwed in and incapable of being screwed out, which includes screw bolt, and round screw head. The slot in the screw head is so shaped, that the screw can be screwed in with a common screw driver and the screw can not be screwed out with one with one screw driver owing to the slant or arced surface in the screwing out direction and no force applying points.

Description

technical field [0001] The invention belongs to a screw, in particular to a screw which can only be rotated but cannot be unscrewed, and thus can be used for anti-theft. Background technique [0002] Screws are the most commonly used mechanical fasteners. When it is necessary to prevent objects to be fixed (such as license plates, etc.) , so the problem of high cost, some anti-theft screws also need to use special tools, which is inconvenient to use. Contents of the invention [0003] The object of the present invention is to provide an anti-theft screw with simple structure, good anti-theft effect, low cost and easy to use. [0004] The object of the present invention is achieved like this, anti-theft screw comprises screw rod, screw head, is used to insert the inline groove of inline screwdriver on the screw head, it is characterized in that, when inline screwdriver rotates by unscrew screw direction, described a The stressed parts on both sides of the word groove are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B41/00
Inventor 唐柳
Owner 唐柳
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