Reusable four-jaw type expansion screw

Abstract

The invention relates to the technical field of screw fasteners, in particular to a reusable four-jaw type expansion screw. The expansion screw is composed of a screw shell, a connecting screw rod anda grooved ram, wherein the connecting screw rod and the grooved ram are arranged in the screw shell; at least the two ram grooves are uniformly formed in the grooved ram in the circumferential direction, movable claws are arranged in the ram grooves, and screw shell openings matched with the movable claws are formed in the surface of the screw shell; and the connecting screw rod can drive the grooved ram to move up and down along the screw shell and enable the movable claws to stretch out or retract from the screw shell openings so as to form or eliminate a resistance point. Compared with theprior art, the reusable four-jaw type expansion screw has the advantages of being firm in expansion and easy to retract when not used, and is beneficial to the safety and the economy of connection; during operation, the multiple movable claws arranged in the circumferential direction of the screw can tightly hold a hole wall so as to form multiple fixing points, so that connection is quite stable; and after being used, the expansion screw can be conveniently dragged out through the top end and can be reversely and repeatedly used, so that material cost is greatly saved.

Description

[technical field] [0001] The invention relates to the technical field of screw fasteners, in particular to a reusable four-claw expansion screw. [Background technique] [0002] Screws are a common fastener widely used in machinery, electrical appliances and buildings. The general material is metal or plastic, and it is cylindrical. It is a tool that uses the physical and mathematical principles of friction of objects to tighten the parts of objects step by step. However, during the long-term use of the screw, under the influence of external force, the screw will gradually withdraw to the outside of the fastened parts, thereby causing the connection between the fastened parts to loosen. And this kind of looseness is often difficult to be found, and it is easy to cause potential safety hazards. Moreover, the existing screws are usually disposable products, and the pulled out screws will have problems such as deformation, which is difficult to meet the needs of repeated use, ...

AI Technical Summary

Problems solved by technology

However, during the long-term use of the screw, the screw will gradually withdraw to the outside of the fastened parts under the influence of external force, resulting in loosening of the connection between the fastened parts

And this kind of looseness is often difficult to be found, and it is easy to cause safety hazards.

Moreover, the existing screws are usually disposable products, and the pulled out screws will have problems such as deformation, which is difficult to meet the needs of repeated use, and does not conform to the environmental protection concept of sustainable use in modern society.

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