CN2177117Y

CN2177117Y - Expansion screw

Info

Publication number: CN2177117Y
Application number: CN 93246854
Authority: CN
Inventors: 张振昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-10
Filing date: 1993-12-10
Publication date: 1994-09-14
Anticipated expiration: 2003-12-10

Abstract

An expansion screw comprises a screw rod with a nut, a sleeve is arranged outside the screw rod, the outer surface and the inner surface of the sleeve are both in tooth shapes, and the surfaces of the screw rod and the sleeve which are matched are in corresponding tooth shapes. The utility model discloses can improve its installation fastness, simple structure moreover.

Description

Expansion screw

The utility model relates to a kind of swell fixture that is fixed on the building wall.

Existing swell fixture is made up of the screw rod and the sleeve of band nut.The deficiency of this swell fixture is: the point of contact of sleeve and building wall causes the fastness of installation limited very little.

The purpose of this utility model provides a kind of swell fixture, and it has a plurality of points to contact with metope.

The utility model is achieved in that swell fixture, comprises a screw rod that has nut, and screw rod has a sleeve outward, and sleeve outer surface and internal surface all are dentation, is corresponding dentation on screw rod and the surface that sleeve matches.Like this, when mounted, turn nut, but the tooth of screw rod just the tooth of all sleeves of jack-up contact with building wall.

Because the utility model has a plurality of points to contact with building wall, therefore compared with the prior art, the installation fastness is big more than 2 times; In addition, compared with the prior art the utility model need not increase annex, thereby structure is still simple.

Below in conjunction with the accompanying drawing comparative examples the utility model is described in detail:

Fig. 1 is an embodiment's of the utility model a structural representation;

Fig. 2 is the unfolded drawing of Fig. 1 middle sleeve;

Fig. 3 is the A-A sectional view among Fig. 1.

Referring to Fig. 1, Fig. 2 and Fig. 3, swell fixture comprises a screw rod (2) that has nut (1).A sleeve (3) is arranged outside the screw rod (2).Sleeve (3) outer surface and internal surface all are dentation.In the present embodiment, sleeve (3) outer surface is the curium dentation, and internal surface is pointed dentation.Be corresponding pointed dentation on screw rod and the surface that sleeve matches.The number of teeth of sleeve interior surface and screw surface is 3 to 8, and present embodiment adopts 4.The number of teeth of sleeve outer surface is 3 to 15, and present embodiment adopts 7.During use, the corresponding part of sleeve (3) and screw rod (2) is inserted in the building wall eye, is turned nut (1), but then the pointed tooth of screw rod just the curium tooth of all sleeves of jack-up firmly contact with building wall.

Claims

1, a kind of swell fixture comprises a screw rod that has nut, and screw rod has a sleeve outward, it is characterized in that: sleeve outer surface and internal surface all are dentation, is corresponding dentation on screw rod and the surface that sleeve matches.

2, swell fixture according to claim 1 is characterized in that: the number of teeth of sleeve interior surface and screw surface is 3 to 8; The number of teeth of sleeve outer surface is 3 to 15.

3, swell fixture according to claim 1 is characterized in that: sleeve outer surface is the curium dentation, and sleeve outer surface is pointed dentation.