CN212003866U

CN212003866U - Adjustable expansion bolt

Info

Publication number: CN212003866U
Application number: CN202020639843.7U
Authority: CN
Inventors: 朱晓飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-11-24
Anticipated expiration: 2030-04-24

Abstract

The adjustable expansion bolt is provided with a screw rod and a nut, the screw rod penetrates through a check ring, an annular chute is formed in the inner side of the check ring, more than two expansion pieces are surrounded on the outer side of the screw rod, a blocking shoulder protruding from the lower end of each expansion piece extends into the chute of the check ring, an expansion head is connected to the front end of the screw rod and is separated from the screw rod, the expansion head is in threaded fit with the screw rod, and a boss for clamping a wrench is arranged at the rear end of the screw rod. When the expansion bolt provided by the utility model is installed, most of the screw rod and the expansion sheet are placed into the installation hole on the wall body, the screw rod is pulled outwards, after the expansion head enters the expansion sheet, the nut is rotated, and after the nut is tightly pressed with the wall surface, the installation of the expansion bolt can be completed; after the installation is finished, when the part of the screw rod extending out of the wall body is long, the nut is loosened, the boss is clamped by a spanner, the screw rod is rotated to move towards the inside of the wall until the length of the extending part is proper, and then the nut is locked, so that the adjustment of the screw rod can be finished.

Description

Adjustable expansion bolt

Technical Field

The utility model relates to a fastener, specifically speaking are expansion bolts.

Background

The traditional expansion bolt is difficult to detach after being installed on a wall body once, and even if the traditional expansion bolt is detached forcibly, the expansion bolt cannot be used again because the deformation of an expansion pipe is difficult to recover, and the wall body is easy to damage after being detached forcibly.

For solving the problem of damaging the wall body after repeated use and demolition, the basic structure of the existing expansion bolt is as follows: the front end of a screw rod is provided with an expansion head integrated with the screw rod, a nut is in threaded fit with the screw rod, the screw rod penetrates through a check ring, the inner side of the check ring is provided with a circular chute, more than two expansion pieces surround the outer side of a bolt body, the lower end of each expansion piece is provided with a protruding retaining shoulder, and the retaining shoulder extends into the chute of the check ring. The screw rod of this kind of expansion bolts is as an organic whole rather than the expansion head of front end, and it installation, dismantlement are swift, ability used repeatedly, and can not damage the wall body after the dismantlement, nevertheless because the screw rod is as an organic whole rather than the expansion head of front end, its installation on the wall body is accomplished the back, and the part that the screw rod stretches out outside the wall body can't be adjusted, consequently the not enough of existence is: according to different requirements, the length of the part of the screw rod extending out of the wall body has certain requirements, and once the screw rod extends out longer and cannot meet the requirements, a tool is used for cutting the redundant part of the screw rod extending out, so that the screw rod is damaged and is difficult to reuse even if the screw rod is detached; intercepting the screw rod can increase the workload and cost of installation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adjustable expansion bolts, when this expansion bolts installs on the wall body, its screw rod stretches out the outer adjustable length of wall body.

In order to achieve the above purpose, the utility model adopts the following technical scheme: adjustable expansion bolts has screw rod, nut, the external screw-thread fit on nut and the screw rod, the screw rod passes a retaining ring, it has the annular spout of circle to open on the inboard of retaining ring, it has two above inflation pieces to surround in the screw rod outside, the lower extreme of each inflation piece has outstanding fender shoulder, keep off the shoulder and stretch into in the spout of retaining ring, the screw rod front end even has the inflation head that is round platform form, inflation head and screw rod are the components of a whole that can function independently, be screw-thread fit between inflation head and screw rod, the rear end of screw rod has a boss that supplies the spanner centre gripping, the boss is quadrangular or hexagonal prism shape.

According to the scheme, when the expansion bolt provided by the utility model is installed, most of the screw rod and the expansion sheet are placed in the installation hole on the wall body, the screw rod is pulled outwards, after the expansion head enters the expansion sheet, the nut is rotated, the expansion sheet is close to the inner wall of the installation hole, and after the nut is tightly pressed against the wall surface, the installation of the expansion bolt can be completed; after the installation is finished, when the part of the screw rod extending out of the wall body is long, the nut is loosened, the boss is clamped by a spanner, the screw rod is rotated to move towards the inside of the wall until the length of the extending part is proper, and then the nut is locked, so that the adjustment of the screw rod can be finished.

The utility model discloses rational in infrastructure, use reliably, it installation, dismantlement and adjustment are convenient, ability used repeatedly, and can not damage the wall body after dismantling.

Drawings

Fig. 1 is a schematic structural diagram and a schematic usage state diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a view from direction B of fig. 1.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

See fig. 1 and 2

The utility model provides an adjustable expansion bolts has screw rod 1, nut 5, the external screw-thread fit on nut 5 and the screw rod 1, screw rod 1 passes retaining ring 2, it has annular spout 2a of circle to open on retaining ring 2's the inboard, it has more than two inflation pieces 3 to surround in the screw rod 1 outside, the lower extreme of each inflation piece 3 has outstanding fender shoulder 3a, keep off shoulder 3a and stretch into in spout 2a of retaining

ring

2, 1 front end of screw rod even has the inflation head 4 that is the round platform form, inflation head 4 and screw rod 1 are the components of a whole that can function independently, be screw-thread fit between inflation head 4 and screw rod 1, screw rod 1's rear end has a boss 1c that supplies the spanner centre gripping, boss 1c is quadrangular prism or hexagonal prism shape.

In this embodiment, the screw rod 1 has a front rod section 1b and a rear rod section 1a with different rod diameters, the rod diameter of the front rod section 1b is smaller than that of the rear rod section 1a, the front rod section 1b and the rear rod section 1a are both provided with external threads, the expansion head 4 is in threaded fit with the front rod section 1b, the nut 5 is in threaded fit with the rear rod section 1a, and the boss 1c is located at the rear end of the rear rod section 1 a. In addition, in this embodiment, three expansion pieces 3 are provided and are uniformly distributed along the circumferential direction of the screw 1 outside.

See fig. 1, 3

In this embodiment, the boss 1c is hexagonal prism-shaped for facilitating the clamping of the wrench.

As shown in fig. 1, when the expansion bolt provided by the utility model is installed, most of the screw rod 1 and the expansion sheet 3 are placed in the installation hole 6a of the wall body 6, the screw rod 1 is pulled outwards, and after the expansion head 4 enters the expansion sheet 3, the nut 5 is rotated, and the expansion head 4 can enable each expansion sheet 3 to gradually lean against the inner wall of the installation hole 6a, so that the expansion bolt can be fixed in the installation hole; after the installation is finished, when the part of the screw rod 1 extending out of the wall body is long, the nut 5 is loosened, the boss 1c is clamped by a spanner, the screw rod 1 is rotated to move towards the inside of the wall until the length of the extending part is proper, and then the nut 5 is locked, so that the adjustment of the screw rod 1 can be finished.

Claims

1. Adjustable expansion bolts has screw rod, nut, and the screw-thread fit on nut and the screw rod, screw rod pass a retaining ring, and it has the annular spout of circle to open on the inboard of retaining ring, and it has the inflation piece more than two to surround in the screw rod outside, and the lower extreme of each inflation piece has outstanding fender shoulder, keeps off the shoulder and stretches into in the spout of retaining ring, and the screw rod front end even has the inflation head that is the round platform form, its characterized in that: the expansion head and the screw are separated, the expansion head and the screw are in threaded fit, the rear end of the screw is provided with a boss for clamping a wrench, and the boss is quadrangular or hexagonal.

2. An adjustable expansion bolt according to claim 1, wherein: the screw rod has preceding pole section and the back pole section that the pole footpath is different, and the pole footpath of preceding pole section is less than the pole footpath of back pole section, all has the external screw thread on preceding pole section and the back pole section, inflation head and preceding pole section screw-thread fit, nut and back pole section screw-thread fit, and the boss is located the rear end of back pole section.

3. An adjustable expansion bolt according to claim 1 or 2, wherein: the boss is hexagonal prism shape.