CN205036708U - Prevent tearing open combination bolts - Google Patents

Abstract

The utility model discloses an anti-demolition combined bolt. The bolt is composed of a head and a screw rod. The outer surface of the screw rod is provided with threads, the end of the screw rod is provided with a cross groove, and the central axis of the screw rod end is provided with a wedge hole. A wedge nail is installed, the upper bottom surface of the wedge nail body is inserted into the deformation hole, and the positioning pin is inserted into the positioning hole. When the utility model is in use, after the nut is installed and fastened, the wedge nail is completely wedged into the wedge nail hole, so that the end of the screw rod is expanded and deformed, and the nut cannot withdraw and cannot be removed. Therefore, the utility model has the characteristics of simple structure, convenient use, firm fixing and good anti-demolition performance.

Description

Anti-disassembly combination bolt

technical field

The utility model relates to an anti-disassembly combined bolt, which belongs to a fastener.

Background technique

In the fields of communications, electric power, railways, etc., a large number of facilities need to be installed outdoors. When traditional ordinary bolts and nuts are used as fasteners, they can be easily removed by ordinary tools. Therefore, anti-tamper bolts or nuts must be used. Some of the existing tamper nuts have irregular shapes, and are installed and removed by specially customized tools, but such tools are easy to imitate, and the tamper effect is not ideal.

Contents of the invention

Aiming at the problems existing in the anti-dismantlement nuts at present, the utility model designs an anti-dismantlement combination bolt, and the scheme adopted is: the bolt is composed of a head and a screw rod, the outer surface of the screw rod is provided with threads, and the end of the screw rod is provided with a cross groove , there is a wedge hole at the central axis of the screw end, and a wedge is installed in the wedge hole. The cross groove is composed of two cutouts that are perpendicular to the center of the screw and have a rectangular cross-section. The screw is divided into four parts in the circumferential direction. The equal part, the wedge nail hole is a secondary blind hole structure, the outer blind hole is a circular deformation hole, the inner blind hole is a circular positioning hole coaxial with the deformation hole, the diameter of the deformation hole is larger than the positioning hole, and the edge of the deformation hole is set. Chamfering, the main body of the wedge is a circular truncated wedge body, a small cylindrical positioning pin protrudes from the center of the upper bottom surface of the wedge body, the diameter of the upper bottom surface of the wedge body is larger than the positioning pin, and the end edge of the positioning pin is chamfered. The diameter of the deformation hole is between the diameter of the upper and lower surfaces of the wedge body, the diameter of the positioning pin is equal to the diameter of the positioning hole, the depth of the cross groove is smaller than the depth of the deformation hole, the depth of the deformation hole is greater than the height of the wedge body, and the depth of the positioning hole is greater than the length of the positioning pin , the upper bottom surface of the wedge body is inserted into the deformation hole, and the positioning pin is inserted into the positioning hole.

When the utility model is used, after the nut is installed and fastened, the wedge nail is completely wedged into the wedge nail hole, so that the end of the screw rod is expanded and deformed, and the nut cannot withdraw and cannot be removed. Therefore, the utility model has the characteristics of simple structure, convenient use, firm fixing and good anti-demolition performance.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a partial cross-sectional schematic diagram of the utility model.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figure 1, the bolt is composed of a head 5 and a screw 4, the outer surface of the screw 4 is provided with threads, the end of the screw 4 is provided with a cross groove 2, and the central axis of the end of the screw 4 is provided with a wedge hole 3, the wedge hole Wedge nail 1 is installed in 3.

As shown in Figure 2, the cross groove 2 is composed of two cutouts perpendicular to the center of the screw 4 and the axial section is rectangular, which divides the screw 4 into four equal parts in the circumferential direction, and the wedge hole 3 is a secondary blind Hole structure, the outer blind hole is a circular deformation hole 31, the inner blind hole is a circular positioning hole 32 coaxial with the deformation hole 31, the diameter of the deformation hole 31 is larger than the positioning hole 32, the edge of the deformation hole 31 is provided with chamfering, wedge nails 1. The main body is a circular truncated wedge body 11. A small cylindrical positioning pin 12 protrudes from the center of the upper bottom surface of the wedge body 11. The diameter of the upper bottom surface of the wedge body 11 is larger than that of the positioning pin 12. The end edge of the positioning pin 12 is provided with an inverted horn. The diameter of the deformation hole 31 is between the diameter of the upper bottom surface of the wedge body 11 and the diameter of the lower surface, the diameter of the positioning pin 12 is equal to the diameter of the positioning hole 32, the depth of the cross groove 2 is less than the depth of the deformation hole 31, and the depth of the deformation hole 31 is greater than the height of the wedge body 11 , the depth of the positioning hole 32 is greater than the length of the positioning pin 12 . The upper bottom surface of the wedge body 11 is inserted into the deformation hole 31 , and the positioning pin 12 is inserted into the positioning hole 32 .

When the utility model is in use, the supporting nut is first installed on the thread of the screw rod 4, and after being fully tightened, the wedge 1 is fully wedged into the wedge hole 3 with tools such as a hammer, because the diameter of the rear end of the wedge 1 is greater than that of the wedge hole 3 diameter, the cross groove 2 at the end of the screw rod 4 will expand and deform outwards, the diameter of the end of the screw rod 4 will become larger, and the nut cannot be completely withdrawn, so it cannot be removed.

Claims (1)

1. An anti-demolition combination bolt, which consists of a head (5) and a screw (4). The outer surface of the screw (4) is provided with threads. It is characterized in that: the end of the screw (4) is provided with a cross groove (2). (4) A wedge hole (3) is provided at the central axis of the end, and a wedge (1) is installed in the wedge hole (3). The screw rod (4) is divided into four equal parts in the circumferential direction, the wedge hole (3) is a secondary blind hole structure, the outer blind hole is a circular deformation hole (31), and the inner blind hole The hole is a circular positioning hole (32) coaxial with the deformation hole (31), the diameter of the deformation hole (31) is larger than the positioning hole (32), the edge of the deformation hole (31) is provided with chamfering, and the main body of the wedge nail (1) is A positive circular truncated wedge body (11), a small cylindrical positioning pin (12) protrudes from the center of the upper bottom surface of the wedge body (11), and the diameter of the upper bottom surface of the wedge body (11) is larger than that of the positioning pin (12). The end edge of the pin (12) is provided with a chamfer, the diameter of the deformation hole (31) is between the diameter of the upper bottom surface of the wedge body (11) and the diameter of the lower bottom surface, and the diameter of the positioning pin (12) is equal to the diameter of the positioning hole (32). The depth of the groove (2) is smaller than the depth of the deformation hole (31), the depth of the deformation hole (31) is greater than the height of the wedge body (11), the depth of the positioning hole (32) is greater than the length of the positioning pin (12), and the upper bottom surface of the wedge body (11) Insert it into the deformation hole (31), and insert the positioning pin (12) into the positioning hole (32).