Rubber-covered expansion bolts

Abstract

The invention discloses a rubber-coated expansion bolt. The rubber-coated expansion bolt comprises a sleeve and an inner rod, wherein a steel plate is rolled into the sleeve; an outer rubber-coated layer is arranged on the outer side of the sleeve; the sleeve is provided with a plurality of expansion portions; each expansion portion consists of two stamped turnover plates; each stamped turnover plate consists of an outward turning portion and an inward recessed portion; the outward turning portions are arranged in the outer rubber-coated layer; the inward recessed portions are formed in the sleeve; and the inner rod is abutted to the inward recessed portions. The rubber-coated expansion bolt has the advantages that the outer rubber-coated layer is arranged on the outer surface of the sleeve, and has certain elasticity, the inner surface of a wood hole is squeezed, and friction force is increased; when the inward recessed portions are squeezed by the polished rod, the outward turning portions deform, pierce the outer rubber-coated layer, and are inserted in wood, so that the rubber-coated expansion bolt is pulled out difficultly; the outward turning portions are provided with saw teeth, and are inserted in a wood layer easily; the outward turning portions are provided with reinforcing grooves, so that the rigidity of the outward turning portions is improved; the stamped turnover plates are opposite, the strength is improved, and the rubber-coated expansion bolt is not easily pulled out; and a stamped binding opening is matched with the annular groove, and the polished rod is prevented from moving.

Description

technical field [0001] The invention relates to an expansion bolt, in particular to a rubber-covered expansion bolt. Background technique [0002] Expansion bolts are common fasteners, including a relatively fixed part and a relatively movable part. During the relative movement of the two parts, the local variation of one of the parts, the diameter becomes larger or the distance between the two ends becomes larger, and the extrusion Tighten the wall of the hole, making it fixed and difficult to pull out. [0003] Commonly used expansion bolts are used in cement materials, such as holes in cement walls or concrete floors. The outer casing is made of iron, and few are suitable for wood. Wooden holes have many wood fibers on the inner surface of the holes, and the force is not strong. More contact area is required. Contents of the invention [0004] The invention aims at the deficiencies of the prior art, and provides a rubberized expansion bolt suitable for being installed...

AI Technical Summary

Problems solved by technology

[0003] Commonly used expansion bolts are used in cement materials, such as holes in cement walls or concrete floors. The outer casing is made of iron, and few are suitable for wood. Wooden holes have many wood fibers on the inner surface of the holes, and the force is not strong. Need more contact area

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