CN2410458Y - Expansion screw - Google Patents

Abstract

The utility model provides an expansion screw, which comprises a screw bolt, a nut, and expansion sleeve, and a flat washer. The expansion screw is characterized in that the screw bolt is a standard screw bolt. The nut is a truncated cone nut. Two to four rotation-proof ribs which are matched with a longitudinal through seam of the expansion sleeve are arranged on a cone surface along the longitudinal direction. The expansion screw has the advantages that a structure is reasonable, the screw bolt is not extended outwards, a wall is restored easily after the expansion screw is disassembled, etc. The expansion screw is suitable for construction and decoration industry to use.

Description

A kind of swell fixture

The utility model relates to screw, and particularly a kind of improved swell fixture is fit to construction industry and uses.

In prior art, swell fixture is the bolt by a band back taper head, and a lower end has the expansion sleeve and the packing ring of three seams, and spring washer and nut are formed.The working principle of this swell fixture is such: get out a deep hole identical with the expansion sleeve diameter on the wall with percussion drill earlier during use, to insert with the bolt of expansion sleeve in the deep hole then, and the fixed hole that article will be installed is enclosed within on the bolt, put packing ring and spring washer again, with nut bolt is pulled out at last.When pulling out bolt, its back taper head nature is pushed the expansion sleeve lower end open, more pulls outward, and expansion sleeve just supports to such an extent that more open, and bolt and expansion sleeve are firmly fastened in deep hole.This shows that this swell fixture can solve general nail effectively can not beat problem on cement wall or brick wall that object is fastening, is used widely.Yet, also there is following deficiency in this expansion of structure nail, because it is fastening to pull out bolt ability, when cement wall or brick wall were hard inadequately, bolt must be pulled out long segment distance just can be fastening, and its part of exposing is lost attractive in appearance, especially more push away after getting rusty and see, and after unloading installation material, residual bolt on the wall is difficult to remove and removes to repair wall, makes the people feel very sorry.

It is a kind of rational in infrastructure that the purpose of this utility model is to provide, and bolt can be not overhanging, recovers the swell fixture of wall original state after the dismounting easily.

Task of the present utility model realizes by this way: this swell fixture includes bolt, nut, expansion sleeve and plain washer, it is characterized in that bolt is a standard bolt, nut is a frustum of a cone nut, longitudinally is provided with 2～4 anti-convulsions that cooperate with the vertical straight joint of expansion sleeve on its conical surface.

The utility model is to use like this: leave a diameter and length and the much the same deep hole of swell fixture with percussion drill on the wall, whole swell fixture is inserted in the deep hole as the inner end with nut, then bolt is screwed out, the mounting hole of article will be installed again aim at deep hole, at last being connected with nut in bolt patchhole again and constantly screwing, its conical surface nature struts the expansion sleeve bottom when nut is pulled out, draw to such an extent that heal and to support greatlyyer, very securely with whole swell fixture with need to install article and be anchored on the wall.This shows that the utility model is compared with existing swell fixture has following advantage: 1, bolt can not be drawn out and extend the outside.Because the utility model is nut to be pulled out rather than pulled out bolt, only sees a level and smooth bright and clean bolt head rather than the threaded stem of bolt, appearance looks elegant in its appearance; 2, bolt is taken out in dismounting back, and next aperture is only stayed in former installation place, just can make wall reply bright and clean smooth former state with cement and applying coating again, and being unlikely to stay both influences attractive in appearancely, causes the exerted bolt of trouble again,

Below in conjunction with accompanying drawing structure of the present utility model is further described.

Fig. 1 is the partial sectional view of a kind of concrete structure of the utility model.

As shown in Figure 1, bolt 1 of the present utility model is a standard bolt, and plain washer 2 also is the standard plain washer, and expansion sleeve 3 is the same with prior art, and the bottom has several vertical straight joints 4 therein, expansion sleeve 3 middle and lower parts is separated several sections, so that strut.Nut 5 is the frustum of a cone nut, longitudinally has 2～4 anti-convulsions 6 that cooperate with expansion sleeve 3 vertical straight joints 4 on its conical surface, is suitable with 2 generally.

The utility model can be widely used in building, industries such as finishing.

Claims (1)

1, a kind of swell fixture, include bolt (1), nut (5), expansion sleeve (3) and plain washer (2), it is characterized in that bolt (1) is a standard bolt, nut (5) is a frustum of a cone nut, longitudinally is provided with 2～4 anti-convulsions (6) that cooperate with the vertical straight joint (4) of expansion sleeve (3) on its conical surface.

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