CN2403939Y - Expansion fastener - Google Patents

Abstract

The utility model discloses an expansion fastener, comprising an expansion body, and an expansion nail, wherein, the rear end of the expansion body has threads, and a nut is screwed on the expansion body. The utility model is characterized in that the center of the expansion body is provided with a staircase-shaped blind hole; the staircase-shaped blind hole is small in front and big at back; the front end of the expansion body is provided with a cross-shaped bursting slot which is communicated with the staircase-shaped blind hole; the expansion nail is pinned into the staircase-shaped blind hole; the diameter of the back end of the staircase-shaped blind hole is slightly longer than the diameter of the expansion nail. When the expansion nail is pinned into the expansion body, the front end of the expansion body expands to press a fixing hole. Consequently, the expansion body is fixed tightly. The utility model has the advantages of simple structure and convenient operation. Meanwhile, the utility model changes the expansion mechanism of an existing expansion bolt, and changes linear expansions to surface expansions; the firmness, the reliability and intensity of the fastener are enhanced.

Description

A kind of novel expansion fastener

The utility model relates to a kind of expansion fastener, particularly a kind of novel expansion fastener.

At present, a large amount of EXPANSION ANCHOR BOLTS of using of China are to rely on the tapering screw rod outer iron sheet that expands, and there is following defective in actual use in this EXPANSION ANCHOR BOLTS:

1, the boring internal diameter is greater than the external diameter of iron sheet garden cover, and iron sheet circle cover internal diameter is again greater than the screw rod external diameter, after installing, between screw rod and the iron sheet circle cover gap is greatly arranged, and causes looseningly easily, even causes that integral body comes off.

2, fix because of the tapering screw size, outer iron sheet thermal expansion is limited, and outer iron sheet to put forth effort area less, its fastening degree is restricted, Security can not reach best desired level.

The utility model provides the novel expansion fastener that a kind of soundness is good, reliability is good and intensity is high, to solve the deficiencies in the prior art part.

The technological scheme that the utility model adopted is: this novel expansion fastener, comprise expander and expandable nail, there is screw thread the rear end of expander, be rotary with nut on it, the center that it is characterized in that described expander has a ladder blind hole, and it is pre-small post-large that described ladder is educated the hole, has the cross spalling groove that communicates with the ladder blind hole at the front end of expander, expandable nail hammers in the described ladder blind hole, and the little diameter greater than expandable nail of the rear end diameter of described ladder blind hole.

Expandable nail is hammered into expander, and expandable nail compressing expander front end expands, and compressing is the hole fixedly, makes expander fastening.This fastener is the swollen effect of brill that relies on expandable nail, the four expandable blade portions that are positioned at the expander front end can be opened to greatest extent, and the inwall of jam-packed boring has fully increased safety coefficient greatly, and expander external diameter unanimity, zero draft is combined closely with the boring inwall, and the gap is minimum, the whole non-loosening in back is installed, and the little diameter of the rear end diameter of the stepped blind hole at expander center greater than expandable nail, the gap is very little, and expandable nail is difficult for loosening.The utility model is simple in structure, use easy to operately, it has changed the mechanism of intumescence of existing EXPANSION ANCHOR BOLTS, and modified line is expanded to surface expansion, soundness, reliability and the intensity of fastening piece are strengthened greatly, and expose length partly when installing and to adjust arbitrarily according to actual needs.

Fig. 1 is a structural representation of the present utility model;

Further describe the utility model below in conjunction with accompanying drawing.

As shown in Figure 1, this novel expansion fastener, comprise expander 1 and expandable nail 2, there is screw thread 3 rear end of expander 1, is rotary with nut 4 on it, and the center of described expander 1 has a ladder the region between the heart and the diaphragm hole 5, it is pre-small post-large that described ladder is educated hole 5, front end at expander 1 has the cross spalling groove 6 that communicates with ladder blind hole 5, and expandable nail 2 hammers in the described ladder blind hole 5, and the little diameter 0.1mm greater than expandable nail 2 of the rear end diameter of described ladder blind hole (5).

Claims (2)

1, a kind of novel expansion fastener, there is screw thread (3) rear end that comprises expander (1) and expandable nail (2), expander (1), be rotary with nut (4) on it, the center that it is characterized in that described expander (1) has a ladder the region between the heart and the diaphragm hole (5), described ladder the region between the heart and the diaphragm hole (5) is pre-small post-large, front end at expander (1) has the cross spalling groove (6) that communicates with ladder blind hole (5), expandable nail (2) hammers in the described ladder blind hole (5), and the little diameter greater than expandable nail (2) of the rear end diameter of described ladder blind hole (5).

2, a kind of novel expansion fastener according to claim 1 is characterized in that the diameter 0.1mm of the rear end diameter of described ladder blind hole (5) greater than expandable nail (2).

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