Improved expansion bolt

Abstract

The invention provides an improved expansion bolt. The improved expansion bolt comprises a screw, a nut, a spring washer, a flat washer, an expansion sleeve and locking limiting strips, wherein an operating head is arranged at the top end of the screw; threads are arranged on the periphery of the upper end of the screw; the nut is mounted on the screw; the spring washer is mounted below the nut; the flat washer is arranged below the spring washer; a tail cone is arranged below the screw; the expansion sleeve is mounted above the tail cone; undercut grooves are formed in the lower end of the expansion sleeve; mounting grooves are formed in the expansion sleeve; each locking limiting strip is arranged in the corresponding mounting groove; a through groove is formed above each mounting groove; a plurality of adjusting grooves are formed in the screw and are matched with the locking limiting strips; a locking part is arranged on each locking limiting strip and is embedded in the corresponding through groove; and each through groove drives the corresponding locking part to expand in the radial direction. The problems that the expansion sleeve rotates along with the screw, so that the tail of the expansion sleeve cannot expand, and bolt connection is unstable can be avoided.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of hardware fittings, in particular to an improved expansion bolt. [0003] 【Background technique】 [0004] People use expansion bolts when decorating houses and installing water and electricity. Expansion screws are generally composed of two parts, one movable and one fixed. Under the action of external force, the two parts move relatively, making the movable or fixed parts The local part of the expansion bolt deforms, the volume becomes larger, and becomes larger than the inner diameter of the hole, thereby generating a locking force. During the use of the expansion bolt, the diameter of the inner arm of the prefabricated hole is often too much larger than the outer diameter of the expansion tube. Because there is no frictional connection between the expansion tube of the expansion bolt and the inner arm of the prefabricated hole, and there is no interlocking connection between the expansion tube a...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art. An improved expansion bolt is proposed. By using the cooperation between the anti-rotation limiting strip and the adjustment groove, the anti-rotation part of the anti-rotation limiting strip is radially expanded, and the locking Tightening the wall can prevent the expansion sleeve from rotating with the screw, causing the tail of the expansion sleeve to fail to expand, resulting in the problem that the bolt connection is not firm

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