1. An anti-rotation expansion bolt comprising: a screw, a nut, a gasket and an expansion tube; the screw rod is provided with a nut, a gasket and an expansion pipe; the screw is characterized in that a bulge or a recess is arranged at the tail end of the screw thread section of the screw.

2. An anti-rotation expansion bolt according to claim 1, wherein the shape of said protrusion is a straight line, cross, triangle, quadrangle, pentagon, hexagon, star, mitre, quincunx, and the key point is that said protrusion can be clamped or sleeved by a tool to fix said screw rod and prevent said screw rod from rotating when said nut is tightened or removed.

3. An anti-rotation expansion bolt according to claim 1, wherein said recess is in the shape of a straight line, cross, triangle, quadrangle, pentagon, hexagon, star, mitre, quincunx, and the key point is that a tool can be inserted into said recess to fix said bolt against rotation when tightening or removing said nut.

Background

The problems often encountered during use of expansion bolts are: due to the factors of loose matrix of a wall body or a building and the like, the diameter of the inner wall of the prefabricated hole is larger than the outer diameter of the expansion pipe, so that the friction force between the expansion pipe and the inner wall of the hole is insufficient; although the expansion pipe and the screw rod can be connected with each other, the expansion pipe and the screw rod can rotate in the hole, so that the nut cannot be screwed down and the expansion bolt cannot expand in the nut fastening process due to the fact that the expansion pipe and the screw rod rotate along with the rotation of the wrench and the nut.

Various existing improvement technologies of the expansion bolt are all improved on an expansion pipe or one end of a conical head of a screw rod to increase the friction force between the expansion pipe and a hole, and the problem that the screw rod rotates along with a nut is solved by means of mutual clamping between the expansion pipe and the screw rod; however, because the inner wall of the hole is circular, the generated friction force of the hole wall is limited, when the locking resistance of the nut is slightly large, the nut and the screw rod can still rotate together, so that the expansion bolt cannot expand, and the working efficiency is influenced.

The invention is different from other improved technologies in that the screw is not indirectly fixed by adopting a method of mutually clamping the screw and the expansion pipe, but the exposed end of the screw is directly fixed by using a tool, so that the nut can be smoothly locked, the open end of the expansion pipe is expanded and the inner wall of the hole is squeezed, and the function of the expansion bolt is realized.

Disclosure of Invention

The invention aims to provide an expansion bolt which prevents a screw rod from rotating along with the screw rod when a nut is screwed or disassembled.

The technical scheme of the invention is as follows: an anti-rotation expansion bolt comprising: a screw, a nut, a gasket and an expansion tube; the screw rod is provided with a nut, a gasket and an expansion pipe; the tail end of the thread section of the screw is provided with a bulge or a recess. In the technical scheme, the screw rod can be fixed by clamping or sleeving the bulge by using a tool or inserting the tool into the recess, so that the screw rod is prevented from rotating along with the nut during screwing or disassembling.

The shape of the bulge can be a straight line, a cross, a triangle, four corners, a pentagon, a hexagon, a star, a Chinese character 'mi' shape and a quincunx shape, and the key point is that the bulge can be clamped or sleeved by a tool so as to fix the screw rod and prevent the screw rod from rotating along with the screwing or the disassembling of the nut.

The shape of the recess can be a straight line, a cross, a triangle, four corners, a pentagon, a hexagon, a star, a Chinese character 'mi' shape and a quincunx shape, and the key point is that a tool can be inserted into the recess, so that the screw rod is fixed, and the screw rod is prevented from rotating along with the screw rod when the nut is screwed down or disassembled.

The invention has the beneficial effects that: the problem that the screw rod rotates along with the rotation of the wrench and the nut when the expansion bolt is screwed down or disassembled can be effectively solved, so that the working efficiency of the expansion bolt is improved.

Drawings

FIG. 1 is a perspective view of a word-shaped protrusion of the present invention;

FIG. 2 is a front view of a word-shaped protrusion of the present invention;

FIG. 3 is a top view of a inline bump of the present invention;

FIG. 4 is a left side view of a inline bump of the present invention;

FIG. 5 is a schematic perspective view of a linear depression according to the present invention;

FIG. 6 is a schematic perspective view of the four-sided bumps of the present invention;

FIG. 7 is a schematic perspective view of a hexagonal recess of the present invention;

description of the figures

1 … screw 2 … nut

3 … shim 4 … expansion tube

5 … bulge 6 … depression

Detailed Description

The technical scheme of the invention is further explained by 2 specific embodiments and the attached drawings.

Embodiment 1, this embodiment discloses an anti-rotation expansion bolt, including: the expansion bolt comprises a screw (1), a nut (2), a gasket (3) and an expansion pipe (4), wherein technical improvement is carried out on the basis of a common expansion bolt, and a mechanism of a protrusion (5) or a recess (6) is designed at the exposed end of the screw (1). As shown in fig. 1 to 4, the expansion bolt of the threaded rod (1) protruding in a straight line will be described below as an example. Firstly, an expansion bolt is assembled according to the figure 1 and then inserted into a wall hole, then a tool such as a handheld vice is used for clamping or sleeving a linear bulge (5) at the exposed end of a screw rod (1), the screw rod (1) is properly forced to prevent the screw rod from rotating, and meanwhile, the nut (2) is locked by another handheld wrench; along with the screwing of nut (2), the conical head of screw rod (1) contacts with the opening of expand tube (4) gradually, and expand tube (4) open end gradually, forms powerful mutual extrusion with the hole inner wall, and the expansion bolts effect can be realized.

Embodiment 2, this embodiment discloses an anti-rotation expansion bolt, including: the expansion bolt comprises a screw (1), a nut (2), a gasket (3) and an expansion pipe (4), wherein technical improvement is carried out on the basis of a common expansion bolt, and a mechanism of a protrusion (5) or a recess (6) is designed at the exposed end of the screw (1). As shown in fig. 5, the expansion bolt of the screw (1) recessed in a straight line will be described below as an example. Firstly, an expansion bolt is assembled according to the figure 5 and then inserted into a wall hole, then a tool such as a handheld screwdriver and the like is inserted into a linear recess (6) at the exposed end of a screw rod (1) to apply force to the screw rod (1) appropriately so as to prevent the screw rod from rotating, and meanwhile, another handheld wrench is used for locking a nut (2); along with the screwing of nut (2), the conical head of screw rod (1) contacts with the opening of expand tube (4) gradually, and expand tube (4) open end gradually, forms powerful mutual extrusion with the hole inner wall, and the expansion bolts effect can be realized.

The screw rod (1) is provided with exposed ends of four-corner protrusions (5) of the screw rod (1) except exposed ends of a straight protrusion (5) and a straight recess (6) as shown in fig. 6, is provided with exposed ends of a hexagonal recess (6) of the screw rod (1) as shown in fig. 7, and is provided with exposed ends of a cross shape, a triangular shape, a pentagonal shape, a star shape, a rice-shaped shape and a quincunx shape of the screw rod (1).

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.