Self-tapping lock screw

A technology for locking screws and screws, applied in the directions of screws, nuts, bolts, etc., can solve the problems of easy release during installation and use, insufficient locking force, small destruction torque, etc., and achieve enhanced locking force and screwing torque. The effect of reducing and improving the anti-destructive moment

Inactive Publication Date: 2009-10-21
CHANGZHOU YIXUAN HARDWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Those skilled in the art recognize that conventional self-tapping locking screws, when used in low ductility materials to create mating internal threads, are prone to stripping during installation and use
Generally, the cross-section of the thread section of the metric self-tapping locking screw is a triangle, with only three sides. When applying rotational motion to this self-tapping locking screw, especially when it is used on non-ferrous metal materials, the screwing torque is relatively large. , the minimum breaking moment is small, easy to trip, and its locking force is not large enough

Method used

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Embodiment Construction

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Such as figure 1 , 2 , 3, a self-tapping locking screw, comprising a screw head 1, a middle threaded locking section 2 and a tail guide section 3, the threaded locking section 2 has a cross-section of the major diameter of five large arcs A pentagonal shape composed of edges. There is a small arc transition between every two adjacent large arc edges. The thread shape and pitch of the thread can be made as required. Compared with the prior art, this structure increases the thread locking section 2 of the self-tapping locking screw from three sides to five sides, which increases the material to be screwed in. The contact area reduces the screwing torque when squeezing the internal thread and increases the tripping strength.

[0018] The arc radius of the large arc edge of the pentagon is R2, the arc radius of the transition small arc line is R1, and the centers of t...

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Abstract

The invention discloses a self-tapping lock screw, comprising a screw head, a middle thread lock section and a tail guide section. The self-tapping lock screw is characterized in that the cross-section with a large thread diameter of the thread lock section is a pentagon consisting of five large arc-shaped edges and lines. A small arc-shaped line transition is arranged between every two adjacent large arc-shaped edges and lines. The guide section is provided with a taper in the axial direction and also provided with a thread; the cross-section with the large thread diameter thereof is also a pentagon consisting of five large arc-shaped edges and lines; and the small arc-shaped line transition is arranged between every two adjacent large arc-shaped edges and lines. The invention provides a self-tapping lock screw which has small screwing moment and strong locking force and is not easy to be loosened, is particularly applicable to materials with bad ductility such as aluminium magnesium alloy or non-ferrous metal, and the like, and can be widely applied to the fields such as aviations, automobiles, electric apparatuses, precise machines, etc.

Description

Technical field [0001] The invention relates to a screw, in particular to a self-tapping locking screw. Background technique [0002] Those skilled in the art recognize that the traditional self-tapping locking screw, when it is used in a low-ductility material to produce a matching internal thread, is easy to trip during installation and use. Generally, the cross-section of the thread section of the metric self-tapping screw is triangular with only three sides. When rotating the self-tapping screw, especially when it is used on non-ferrous metal materials, the screwing torque is relatively large. , The minimum breaking torque is small, easy to trip, and its locking force is not large enough. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a self-tapping locking screw with small screwing torque, large minimum breaking torque, strong locking force, and the matching internal thread is not easy to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B25/10F16B33/02F16B23/00
Inventor 李允贻张培秋杨瑜璋何乃春
Owner CHANGZHOU YIXUAN HARDWARE
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