An expansion bolt

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By designing an expansion module that includes fastening bolts, threaded sleeves, and extrusion blocks, the problem of expansion bolts protruding from the wall surface after installation was solved, thus improving both safety and aesthetics.

CN224315322UActive Publication Date: 2026-06-02GUANGZHOU FANYI IND FASTENER CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: GUANGZHOU FANYI IND FASTENER CO LTD
Filing Date: 2025-08-20
Publication Date: 2026-06-02

AI Technical Summary

Technical Problem

The existing expansion bolts protrude too much from the wall after installation, posing a safety hazard and affecting the aesthetics.

Method used

An expansion bolt comprising an expansion tube and an expansion module was designed. The expansion module consists of a fastening bolt, a threaded sleeve, and a compression block. The threaded sleeve engages with the fastening bolt, causing the compression block to compress the expansion tube, thereby expanding and fixing the expansion tube and preventing additional protrusions.

Benefits of technology

This effectively reduces safety hazards, enhances aesthetics, and ensures that the expansion bolts are firmly fixed in the pre-drilled holes.

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Figure CN224315322U_ABST

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Abstract

This utility model application discloses an expansion bolt, including an expansion tube and an expansion module. The expansion module is installed inside the expansion tube. The expansion module includes a fastening bolt, a threaded sleeve, and a compression block. One end of the threaded sleeve is fixedly provided with the compression block, and the other end of the threaded sleeve has an internal thread. The threaded sleeve is adapted to the fastening bolt and is inserted into the expansion tube. The compression block abuts against the end of the expansion tube, and the threaded end of the fastening bolt engages with the internal thread of the threaded sleeve. This expansion bolt is inserted into a pre-set hole using a jack. Then, by turning the fastening bolt inside the countersunk sleeve with a wrench, the fastening bolt engages with the threaded sleeve, causing the threaded sleeve to drive the compression block to compress the expansion tube, thus expanding the end of the expansion tube and firmly fixing it in the pre-set hole. This expansion bolt can avoid excessive protrusion from the wall surface after installation, effectively reducing safety hazards and enhancing its aesthetics.

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