Outer double-straight-line-shaped expansion bolt

Abstract

The utility model belongs to the field of expansion bolts, and discloses an outer double-straight expansion bolt which comprises a rod body device used for stretching and applying force, a force applying device installed at the bottom of the rod body device and used for locking and fixing, and a limiting device installed in the middle of the rod body device and used for applying force and positioning. The limiting device comprises an outer sleeve, the top end of the outer sleeve is provided with a positioning assembly, and the top end of the positioning assembly is provided with a positioning groove. The rod body device comprises a bolt rod, a connecting rod is arranged at the top end of the bolt rod, an expansion plate is mounted at the top end of the connecting rod, and a hinge shaft is mounted between the expansion plate and the connecting rod. According to the external double-straight-line-shaped expansion bolt, the vertical straight line shape is formed through the positioning expansion plate, the expansion force under the same length is increased, and the fixing firmness is improved; through the arrangement of the two-half structure of the positioning head, disassembly and assembly are facilitated, and the friction force for extruding the inner wall of the mounting hole is increased; and through the arrangement of the inclined guide surface, the whole inclined expansion plate can be conveniently inserted into the mounting hole, and the mounting convenience is improved.

Description

Technical Field

[0001] The utility model belongs to the field of expansion bolts, in particular to an external double-slot expansion bolt. Background Art

[0002] Scissor-type expansion bolts are designed for porous materials like hollow bricks and foam bricks, providing a secure installation. To install, use an alloy drill bit with the same diameter as the expansion ring of the expansion bolt to drill a hole to a depth equal to the bolt length. Place the expansion bolt kit into the hole, gently tap the head with a hammer, and then tighten the cap to secure the object.

[0003] In contrast, the Chinese patent with announcement number CN212055423U discloses a universal expansion bolt, comprising a screw, an outer sleeve, a sleeve nipple, and two diamond-shaped expansion plates. The outer sleeve and the sleeve nipple are both mounted on the outside of the screw, and the two expansion plates are symmetrically hinged on both sides of the upper end of the screw. The sleeve nipple is arranged between the outer sleeve and the expansion plates, and the lower end of the screw is threadedly connected to the nut; the top of the sleeve nipple is provided with a limiting structure that cooperates with the expansion plates. By mounting the outer sleeve and the sleeve nipple on the outside of the screw, the sleeve nipple and the outer sleeve can be driven to move along the screw by rotating the nut at the lower end, thereby adjusting the angle between the two expansion plates; at the same time, a limiting structure that cooperates with the two expansion plates is provided on the top of the sleeve nipple, which can prevent the sleeve nipple from rotating circumferentially relative to the expansion plates, ensuring that the expansion plates are flexible in opening and closing; the angle of the two expansion plates can be adjusted by simply turning the nut, which is convenient and quick to adjust, saving time and effort.

[0004] However, the two diamond-shaped expansion plates in the above patent form a fork shape, and the expansion force under the same length is smaller than that of the straight shape, and the reliability is poor, so a new device needs to be designed. Utility Model Content

[0005] The purpose of the utility model is to provide an external double straight expansion bolt to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An external double-slot expansion bolt includes a rod device for stretching and applying force, a force-applying device for locking and fixing is installed at the bottom of the rod device, and also includes a limiting device installed in the middle of the rod device for force positioning; the limiting device includes an outer sleeve, a positioning component is installed at the top of the outer sleeve, and a positioning groove is provided at the top of the positioning component.

[0008] Furthermore: the rod body device includes a bolt rod, a connecting rod is provided at the top end of the bolt rod, an expansion plate is installed at the top end of the connecting rod, and a hinge shaft is installed between the expansion plate and the connecting rod.

[0009] Furthermore: the connecting rod is in the shape of a rectangular plate, and the connecting rod and the bolt rod are integrally formed.

[0010] Furthermore: the expansion plates are diamond-shaped, two of them are provided, and are symmetrically installed on both sides of the connecting rod.

[0011] Furthermore: the force applying device includes a locking nut, a spring washer is arranged above the locking nut, and a flat washer is arranged above the spring washer.

[0012] Furthermore, the positioning assembly includes a positioning head, a connecting platform is provided at the bottom of the positioning head, two inclined guide surfaces are symmetrically provided on both sides of the positioning head, and a through hole is provided in the middle of the positioning head.

[0013] Furthermore: the positioning head is a two-half type, adopting a cylindrical structure.

[0014] Compared with the prior art, the beneficial effects are:

[0015] 1. By positioning the expansion plate to form a vertical straight line, the expansion force under the same length is increased, and the reliability of the fixation is improved;

[0016] 2. The two-half structure of the positioning head not only facilitates disassembly and assembly, but also increases the friction force of squeezing the inner wall of the installation hole;

[0017] 3. The setting of the inclined guide surface makes it easier to tilt the expansion plate and insert it into the installation hole, which increases the convenience of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of an external double-slot expansion bolt described in the utility model;

[0019] Figure 2 This is a front view of an external double-slot expansion bolt described in the utility model;

[0020] Figure 3 This is a schematic diagram of the rod device of an external double-slot expansion bolt described in the utility model;

[0021] Figure 4 This is a schematic diagram of a limiting device for an external double-slot expansion bolt according to the present invention;

[0022] Figure 5 It is a schematic diagram of a force-applying device of an external double-slot expansion bolt described in the utility model.

[0023] In the accompanying drawings: 101, bolt rod; 102, connecting rod; 103, expansion plate; 104, hinge shaft; 201, outer sleeve; 202, positioning head; 203, connecting platform; 204, positioning groove; 205, inclined guide surface; 206, through hole; 301, locking nut; 302, spring washer; 303, flat washer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 5 , an external double-slot expansion bolt, including a rod device for stretching and applying force, a force applying device for locking and fixing is installed at the bottom of the rod device, and also includes a limiting device installed in the middle of the rod device for force positioning.

[0026] In this embodiment, the rod device includes a bolt rod 101, a connecting rod 102 is provided at the top of the bolt rod 101, the connecting rod 102 is in the shape of a rectangular plate, the connecting rod 102 and the bolt rod 101 are integrally formed, an expansion plate 103 is installed at the top of the connecting rod 102, the expansion plates 103 are diamond-shaped, and two are provided, which are symmetrically installed on both sides of the connecting rod 102, and a hinge shaft 104 is installed between the expansion plate 103 and the connecting rod 102; the bolt rod 101 is pulled out of the mounting hole, and the bolt rod 101 passes through the through hole 206 in the middle of the positioning head 202 through the connecting rod 102 to pull the expansion plate 103, and the expansion plate 103 is limited by the positioning groove 204 at the top of the positioning head 202 to form a straight line perpendicular to the connecting rod 102, thereby increasing the expansion force;

[0027] In this embodiment: the limiting device includes an outer sleeve 201, a positioning assembly is installed on the top of the outer sleeve 201, and a positioning groove 204 is provided on the top of the positioning assembly; the positioning assembly includes a positioning head 202, the positioning head 202 is a two-half type, adopts a cylindrical structure, a connecting platform 203 is provided at the bottom of the positioning head 202, two inclined guide surfaces 205 are symmetrically provided on both sides of the positioning head 202, and a through hole 206 is provided in the middle of the positioning head 202; before the overall insertion into the mounting hole, the expansion plate 103 is tilted along the inclined guide surface 205 of the positioning head 202 for easy entry; after the overall insertion into the mounting hole, the bolt rod 101 passes through the through hole 206 in the middle of the positioning head 202 through the connecting rod 102 to pull the expansion plate 103, so that the positioning head 202 and the outer sleeve 201 are squeezed and fixed on the inner wall of the mounting hole, further preventing it from falling out of the mounting hole;

[0028] In this embodiment, the force-applying device includes a locking nut 301 , a spring washer 302 is provided above the locking nut 301 , and a flat washer 303 is provided above the spring washer 302 ; the locking nut 301 is tightened along the bolt rod 101 so that the locking nut 301 presses the spring washer 302 and the flat washer 303 , pulling the bolt rod 101 to apply force.

[0029] Working principle: First, rotate the expansion plate 103 under the support of the hinge shaft 104 on the connecting rod 102, so that the expansion plate 103 tilts along the inclined guide surface 205 of the positioning head 202, and then insert the whole into the mounting hole starting from the expansion plate 103, and then tighten the locking nut 301 along the bolt rod 101, so that the locking nut 301 compresses the spring washer 302 and the flat washer 303, and pulls the bolt rod 101 out of the mounting hole. The bolt rod 101 passes through the through hole 206 in the middle of the positioning head 202 through the connecting rod 102 to pull the expansion plate 103. The expansion plate 103 is limited by the positioning groove 204 at the top of the positioning head 202, forming a straight line perpendicular to the connecting rod 102, thereby increasing the expansion force, and at the same time, the positioning head 202 and the outer sleeve 201 are squeezed and fixed on the inner wall of the mounting hole, further preventing it from falling out of the mounting hole.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external double-slot expansion bolt, comprising a rod device for stretching and applying force, a force-applying device for locking and fixing is installed at the bottom of the rod device, characterized in that: It also includes a limiting device installed in the middle of the rod device for applying force and positioning; The limiting device comprises an outer sleeve (201), a positioning assembly is installed at the top end of the outer sleeve (201), and a positioning groove (204) is provided at the top end of the positioning assembly.

2. The external double straight expansion bolt according to claim 1, characterized in that: The rod body device comprises a bolt rod (101), a connecting rod (102) is provided at the top end of the bolt rod (101), an expansion plate (103) is installed at the top end of the connecting rod (102), and a hinge shaft (104) is installed between the expansion plate (103) and the connecting rod (102).

3. The external double straight expansion bolt according to claim 2, characterized in that: The connecting rod (102) is in the shape of a rectangular plate, and the connecting rod (102) and the bolt rod (101) are integrally formed.

4. The external double straight expansion bolt according to claim 3, characterized in that: The expansion plates (103) are rhombus-shaped, two of which are provided and symmetrically mounted on both sides of the connecting rod (102).

5. The external double straight expansion bolt according to claim 1, characterized in that: The force applying device comprises a locking nut (301), a spring washer (302) is provided above the locking nut (301), and a flat washer (303) is provided above the spring washer (302).

6. The external double straight expansion bolt according to claim 1, characterized in that: The positioning assembly comprises a positioning head (202), a connecting platform (203) is provided at the bottom of the positioning head (202), two inclined guide surfaces (205) are symmetrically provided on both sides of the positioning head (202), and a through hole (206) is provided in the middle of the positioning head (202).

7. The external double straight expansion bolt according to claim 6, characterized in that: The positioning head (202) is a two-half type, cylindrical structure.

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