Clamping and folding expansion bolt

Abstract

The invention discloses a clamping and folding expansion bolt composed of an expansion tube, a nut, a screw, a washer and a spring washer and the like. One end of the nut is provided with a cone or no cone. A rotary-thread clamp duct is arranged in the cone, rotary-thread buttresses are arranged on two sides of the rotary-thread clamp duct, and acute angles or arc surfaces are formed on the surfaces of the rotary-thread buttresses. The small-diameter end of the cone is provided with a high wall gradually extending to the large-diameter end to be provided with a shallow wall. A wide clamp duct is arranged at an inlet end of the rotary-thread clamp duct and gradually extends to the large-diameter end to be provided with a narrow clamp duct, and slotting ends of rotary-thread clamp pieces are provided with hemming heads so as to easily enter the rotary-thread clamp duct and stably extend to clamp and fold. The rotary-thread clamp pieces gradually extend to be clamped and folded into the narrow clamp duct by the rotary-thread clamp duct, and the rotary-thread clamp pieces are extruded into a cylinder by a strong force to expand a basic hole wall and are punctured by sawteeth to be gripped and fixed.

Description

technical field [0001] The invention relates to a special fixed connector for installing machinery, equipment, structural parts and the like. Background technique [0002] The existing expansion bolt consists of a screw rod, a nut, an expansion tube, a washer, a spring and a washer, and one end of the screw rod is a cone. When turning with a wrench, the expansion tube moves toward the cone, gradually increasing the expansion tube. Rough concavo-convex lines are provided on the peripheral surface of the expandable tube, which has already been formed on the peripheral surface of the expandable tube, and there is no change and increase. In the patent records of convex expansion bolts or double convex expansion bolts, the convex strips are not easy to bend the seam edge, and the seam edge of the expansion tube is adjacent to the helical line. Unstable, unable to achieve expansion effect. The large-diameter end of the conical body of the existing expansion bolt is too short, a...

AI Technical Summary

Problems solved by technology

In the patent records of convex expansion bolts or double convex expansion bolts, the convex strips are not easy to bend the seam edge, and the seam edge of the expansion tube is adjacent to the helical line. Unstable, unable to achieve expansion effect

The large-diameter end of the cone of the existing expansion bolt is too short, and the expansion piece will shrink after being squeezed through the large-diameter end, reducing the expansion strength

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