CN2464976Y

CN2464976Y - Thin wall expanding screw

Info

Publication number: CN2464976Y
Application number: CN 01213892
Authority: CN
Inventors: 罗惠琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-10
Filing date: 2001-01-10
Publication date: 2001-12-12
Anticipated expiration: 2011-01-10

Abstract

The utility model relates to an expanding screw for thin walls, belonging to a connecting piece, particularly to the expanding screw which is used for construction and decoration industry and is fixed to a thin board. An expanding sheath is provided with a longitudinal groove. Ribs of the sheath are curved into wave shapes. The width of a root part of the ribs is narrower than those of the rest parts and the root part is concave inwards towards the center. A nut is fixed to the top of the sheath. When the expanding screw for thin walls is used, the deformation of the root part and the middle part of the sheath is larger by the screw. The expanding screw for thin walls is expanded fully to be pressed on a wall surface. The expanding screw for thin walls has the advantages of simple structure and easy manufacture and installation. The expanding screw for thin walls can be tightly fixed to a thin wall board.

Description

A kind of thin-walled swell fixture

The utility model belongs to link, and particularly building, decorative craft are used is fixed on swell fixture on the thin plate.

Traditional EXPANSION ANCHOR BOLTS all is to utilize bolt to screw in, and with the front end distending of expansion sleeve, thereby front end tightly is stuck in the hole of wall.It is preferably that this EXPANSION ANCHOR BOLTS is used for thicker wallboard effect, but is used in thin wallboard, and as ceiling board, when thin-walled cuts off wallboard, fastening effect is just very poor.For addressing this problem, the scheme of the expansion of metal cover of hollow outs in the middle of some has been proposed in the Chinese patent literature, when bolt tightened, the intermediate deformation projection of cover was clamped in the both sides of plate.In actual use, the deformation position of this expansion sleeve is irregular, sometimes can not fine clamping both sides, loosening phenomenon is arranged; Sometimes indeformable, or distortion inward, expansion sleeve can not open by the imagination mode; When taking place to become flexible, if continue to bolt on, Chang Yi draws thin-walled bad.

The purpose of this utility model provides a kind of suitable thin-walled part EXPANSION ANCHOR BOLTS, and it is simple in structure, makes and installs easily, can just in time outwards be out of shape in the precalculated position, and thin plate is clamped.

The technical solution of the utility model is: having on the expansion sleeve on the cannelure basis according to prior art is described, carry out following improvement, promptly Tao rib bends to waveform, and the width of the root of rib is narrower and to the center indent than all the other positions, and nut is fixed on the cover top.When screw being penetrated expansion sleeve screw, rib is under pressure, because the width of middle part and root is narrow, and curves inwardly, so distortion just in time occurs in root and middle part, the rib at these two positions is outwards launched, and thin-walled compresses the most at last.

Below, two specific embodiments of the present utility model according to Figure of description provides are further described its structure.

Fig. 1 is the structural representation of expansion sleeve;

The schematic representation that Fig. 2 begins to be out of shape for the expansion sleeve rib;

Fig. 3 compresses the thin-walled schematic representation for the expansion sleeve rib.

Referring to each figure, have cannelure 2 on the expansion sleeve 1 of this swell fixture, do not formed rib 3 by the part of hollow out, rib 3 is bent to waveform when punching press or injection moulding, the width of the root of rib 3 is narrower and to the center indent than all the other positions, and nut 4 is fixed on expansion sleeve 1 top.During installation, choose the perforated section 5 and the close cover of wooden partition 6 sizes of expansion sleeve 1, fill in the cinclides, again screw 7 is tightened, rib 3 under pressure, middle part and root in easy deformation outwards launch gradually, and the hypomere concora crush of last rib 3 is on the surface of wooden partition 6, and the epimere of rib 3 props up hypomere, the rib 3 of distortion has formed trapezium structure, expansion sleeve is fixed on the wooden partition 6 firmly, loosening no longer easily, and can carry bigger power.In order to make fixed effect better, the bottom gasket 8 of expansion sleeve 1 is provided with latch 9, can snap in the wooden partition 6 when tightening, and the perforated section 5 of cover is identical with the length S of wooden partition, just can guarantee vertically not stay substantially the gap when tightening.

From technique scheme of the present utility model, this swell fixture is very suitable to be fixed on the thin hollow wall, its rib reasonable in design, when stressed, can guarantee outside expansion, so can eliminate common loosening gap or indeformable, when this screw tightens in addition, be difficult for drawing wallboard bad.

Claims

1, a kind of thin-walled swell fixture is made up of screw and expansion sleeve, has cannelure on the expansion sleeve, it is characterized in that the rib that overlaps bends to waveform, and the width of the root of rib is narrower and to the center indent than all the other positions, and nut is fixed on the cover top.

2, by the described thin-walled swell fixture of claim 1, it is characterized in that overlapping latch is arranged on the bottom gasket, the perforated section of cover is identical with wallboard length.