Spiral expansion bolt

Abstract

The invention provides a spiral expansion bolt which comprises a bolt body, an outer casing pipe and a nut. The outer casing pipe is arranged outside the bolt body. The nut cooperates with the bolt body. A gasket and a spring washer are further arranged between the nut and the outer casing pipe. Mounting holes are formed in the outer casing pipe, a clamp block is mounted in each mounting hole, spiral columns are arranged on the front portion of the bolt body, and when the bolt body is driven by nut to move, the spiral columns can push the clamp blocks to rotate outwards so as to achieve locking. The front end faces and the rear end faces of the clamp blocks cooperate with an annular hole, and therefore the expansion bolt can be fixed axially, motion of the expansion bolt in the front and back axial directions is limited, the upper end faces of the clamp blocks cooperate with the annular hole so that the expansion bolt can be fixed in the radial direction, the expansion bolt cannot movein the radial direction, and therefore important objects can be firmly fixed in occasions with vibration.

Description

technical field [0001] The invention relates to the technical field of standard parts and bolts, in particular to a spiral expansion bolt. Background technique [0002] The expansion bolt consists of a countersunk bolt body, an outer sleeve expansion tube, a flat washer, a spring washer and a hex nut. When in use, you must first drill holes of corresponding size on the fixed body with an impact electric drill hammer, then put the bolts and expansion tubes into the holes, and tighten the nuts to make the bolts, expansion tubes, mounting parts and the fixed body expand. Tightly become one. [0003] It will expand after tightening. There is a big head at the end of the bolt, and a round pipe slightly larger than the diameter of the bolt is placed outside the bolt. There are several openings in the tail part. When the bolt is tightened, the tail of the big head is brought into the open pipe. The pipe is punched big to achieve the purpose of expansion, and then the bolts are fi...

AI Technical Summary

Problems solved by technology

[0004] The expansion bolts of the existing structure, when it is necessary to fix important items in the occasion with vibration, because the ordinary expansion bolts expand by the tail of the outer sleeve, only the friction force of the outer circular surface of the tail of the outer sleeve can be used to fix the items, and the items cannot be effectively fixed.

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