Anti-loose screw set

By designing anti-loosening screw assemblies, the combination of expansion plugs and screws enhances the connection strength and stability of screws in soft or brittle substrates, solving the loosening problem of ordinary screws under vibration and axial pull-out force.

CN224533201UActive Publication Date: 2026-07-21SHAOXING SHUNXIN FASTENERS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHAOXING SHUNXIN FASTENERS CO LTD
Filing Date
2025-10-27
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In soft or brittle substrates, the thread holding force of ordinary screws is limited, making them prone to loosening under vibration, and traditional anti-loosening designs are weak in protecting against axial pull-out forces.

Method used

An anti-loosening screw assembly is adopted, which includes an expansion plug and a screw. The expansion plug consists of a first expansion body and a second expansion body. It is equipped with an oblique anti-loosening piece and a limiting retaining ring. It is driven by the self-tapping part and the expansion part of the screw at the same time, forming a longer anchoring section and radial pressure. Combined with the limiting ring groove and the snap-locking structure, the connection strength and stability are enhanced.

Benefits of technology

It effectively prevents screws from loosening and falling out in soft or brittle substrates, enhances connection strength and stability, prevents tearing of substrate hole walls, and improves anti-loosening ability.

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Abstract

A kind of anti-loose screw group belongs to fastener technical field;By setting first expansion body and second expansion body two expansion sections, by the self-tapping portion of screw and expansion portion are driven simultaneously, this forms longer anchoring section and more uniform radial pressure, greatly enhances the overall connection strength and stability in soft or brittle base material (such as plastic, aluminum alloy), prevent base material hole wall from being torn;The oblique anti-retreat piece set on the second expansion body, these anti-retreat pieces will be like barb more deeply wedge into base material hole wall, produce huge mechanical resistance, fundamentally change the limitation of traditional anti-loose piece passive resistance;Limiting ring groove is opened in the expansion of screw, and the limiting snap ring that is matched with it is set in the inner wall of first expansion body.This constitutes an internal buckle locking structure, effectively prevent screw from being pulled out from the plug under the action of axial tension, lock screw and plug as a whole.
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