Expansion bolt

Abstract

The invention discloses an expansion bolt which comprises a bolt body. The bolt body penetrates through the sleeve and is meshed with the nut; an elastic piece is arranged on the sleeve, in a first state, the elastic piece is located on the outer side of the nut, and the bolt body is rotated to enable the nut to move towards the direction of the bolt body; the elastic piece is expanded and bent towards the two sides, and is converted into a second state from a first state; the nut is clamped with the sleeve; according to the device, the bolt body is inserted into the inner side of the sleeve, the elastic piece is arranged on the sleeve and matched with the nut, during installation, the nut can stretch into the inner side of the sleeve, after the bolt body stretches into the sleeve by a certain length, the elastic piece stretches outwards and is matched with the sleeve for limiting, the bolt body is screwed, and installation is completed.

Description

Technical Field

[0001] This invention relates to the field of fasteners, and more particularly to an expansion bolt. Background Technology

[0002] Expansion bolts are mostly used to fix equipment, including decorations, advertising light boxes, security windows, air conditioner outdoor units, and other equipment that needs to be fixed to the ceiling and walls. Various types of expansion bolts are used for installation. For some heavy objects, iron expansion bolts are usually chosen, and the size of the expansion bolt is determined according to the weight.

[0003] When using expansion bolts to fix objects, the nuts are tightened to secure them, leaving part of the bolt exposed outside the equipment. Exposed bolts are not only prone to rust but can also scratch people, posing a safety hazard. Generally, a grinding and cutting machine is used to cut off the exposed bolts. However, after cutting, the cut surface of the bolt lacks protection such as thread sealant or plating, making it even more susceptible to rust. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an expansion bolt.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an expansion bolt, comprising:

[0006] Bolt body;

[0007] The bolt body penetrates the sleeve and engages with the nut;

[0008] The sleeve is provided with an elastic element. In the first state, the elastic element is located on the outside of the nut.

[0009] Rotate the bolt body to move the nut toward the bolt body; the elastic element opens and bends to both sides, changing from the first state to the second state; the nut engages with the sleeve.

[0010] As a further description of the above technical solution: the nut includes a connecting section and a spreading section. The connecting section is annular and has threads on its inner side, which mesh with the bolt body.

[0011] As a further description of the above technical solution: the supporting section is frustum-shaped with a through hole in the middle, and the smaller side plane is integrally connected with the connecting section.

[0012] As a further description of the above technical solution: at least one groove is provided on the spreading section, and the groove and the connecting section form a stepped shape.

[0013] As a further description of the above technical solution: at least two slots are provided on the outer side of the sleeve, and the elastic element is formed between the two slots. A hook is provided on the side of the elastic element near the bolt body.

[0014] As a further description of the above technical solution: In the first state, the radial dimension of the elastic element is the same as the diameter of the sleeve, and the elastic element is located outside the connecting section.

[0015] As a further description of the above technical solution: In the second state, the elastic element opens radially outward and extends to the outside of the sleeve, the hook moves from the outside of the connecting section and cooperates with the groove to limit the nut.

[0016] As a further description of the above technical solution: two elastic elements are provided, which are arranged opposite to each other on both sides of the sleeve.

[0017] As a further description of the above technical solution: a limiting groove with the same shape but opposite direction as the hook is opened on the inner side of the groove, and the groove is used to limit the engagement with the hook.

[0018] As a further description of the above technical solution: a gasket is provided between the bolt body and the sleeve.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1. By inserting the bolt body into the inside of the sleeve, and the sleeve having an elastic element that engages with the nut, during installation, the nut extends into the inside of the sleeve. When the bolt body extends to a certain length, the elastic element opens outward and engages with the sleeve to limit the movement, thus tightening the bolt body to complete the installation. Attached Figure Description

[0021] Figure 1 This is a perspective view of the expansion bolt proposed in this invention;

[0022] Figure 2 This is a schematic diagram of the expansion bolt proposed in this invention;

[0023] Figure 3 This is a cross-sectional view of the expansion bolt proposed in this invention;

[0024] Figure 4 for Figure 1 A sectional view along line A in the middle;

[0025] Figure 5 This is a side view of the expansion bolt proposed in this invention;

[0026] Figure 6 This is a bottom view of the expansion bolt proposed in this invention;

[0027] Figure 7 This is a schematic diagram of another embodiment of the expansion bolt proposed in this invention.

[0028] Legend:

[0029] 1. Bolt body; 2. Sleeve; 21. Elastic element; 22. Hook; 3. Nut; 31. Connecting section; 32. Spreading section; 33. Groove; 34. Limiting groove; 4. Washer. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figures 1-7 An embodiment of the present invention provides an expansion bolt, comprising: a bolt body 1; the bolt body 1 penetrates a sleeve 2 and engages with a nut 3; an elastic element 21 is provided on the sleeve 2, in a first state, the elastic element 21 is located outside the nut 3, rotating the bolt body 1 causes the nut 3 to move toward the bolt body 1; the elastic element 21 opens and bends to both sides, changing from the first state to the second state; the nut 3 is engaged with the sleeve 2; a washer 4 is provided between the bolt body 1 and the sleeve 2.

[0032] In this embodiment, when installing the bolt body 1, the bolt body 1 is inserted into the inner side of the sleeve 2 through the washer 4, and the bolt body 1 and sleeve 2 are placed into the drilled hole for equipment installation. At this time, the elastic element 21 on the sleeve 2 is in the first state. During installation, the bolt body 1 is rotated clockwise with a wrench, causing the thread on it to rotate. Under the drive of the thread, the nut 3 moves along the axial direction of the bolt body 1 with the rotation of the thread, and the elastic element 21 is forced to open to both sides until it engages with the nut 3, from the first state. The state changes to the second state. Nut 3 extends into the inside of sleeve 2 and is limited under the spreading section 32, so that nut 3 cannot move. At this time, bolt body 1 cannot rotate, and the fastening is completed. Elastic element 21 expands outward to increase the resistance with the inside of the hole. After completion, bolt body 1 and washer 4 are removed. Due to the limiting cooperation between sleeve 2 and nut 3, they are fixed by hook 22. Nut 3 will not rotate. After removal, the object is put on bolt body 1, and then bolt body 1 is inserted into sleeve 2 for tightening and installation.

[0033] The nut 3 includes a connecting section 31 and a spreading section 32. The connecting section 31 is annular and has threads on its inner side, which mesh with the bolt body 1.

[0034] In this embodiment, the nut 3 is divided into a connecting section 31 and a spreading section 32. The inner diameter of the connecting section 31 is connected to the bolt body 1 by a thread. The outer diameter of the connecting section 31 is smaller than the inner diameter of the sleeve 2, so that the connecting section 31 can enter the inner side of the sleeve 2.

[0035] The supporting section 32 is frustum-shaped with a through hole in the middle, and the smaller side plane is integrally connected to the connecting section 31.

[0036] In this embodiment, the spreading section 32 is frustum-shaped and integrally connected with the connecting section 31, so that one side of the spreading section 32 can extend into the inner side of the sleeve 2, and the outer diameter of the other end face of the spreading section 32 is larger than the diameter of the sleeve 2. After the spreading section 32 extends into the inner side of the sleeve 2, it squeezes the elastic element 21, causing the elastic element 21 to deform outward. After extending a certain distance, the deformation of the spreading section 32 and the sleeve 2 is at its maximum. At this time, one side of the sleeve 2 that cooperates with the spreading section 32 expands outward and cooperates with the inner side of the hole to fix the position of the sleeve 2.

[0037] At least one groove 33 is provided on the spreading section 32, and the groove 33 and the connecting section 31 form a stepped shape.

[0038] In this embodiment, there are two grooves 3, located on opposite sides of the spreading section 32. The grooves 32 and the plane of the connecting section 31 form a stepped shape. The two sides of the grooves are vertical end faces, which facilitates rotation and positioning.

[0039] At least two slots are provided on the outer side of the sleeve 2, and an elastic element 21 is formed between the two slots. A hook 22 is provided on the side of the elastic element 21 near the bolt body 1.

[0040] In this embodiment, the elastic element 21 is integrally connected with the sleeve 2. Four slots are opened on the sleeve 2. The part between two adjacent slots is the elastic element 21. A hook 22 is provided on the inner side of the elastic element 21. The hook 22 cooperates with the groove 33 of the nut 3 so that the nut is installed on the groove 33.

[0041] In the first state, the radial dimension of the elastic element 21 is the same as the diameter of the sleeve 2, and the elastic element 21 is located outside the connecting section 31.

[0042] In this embodiment, the elastic element 21 is not under force in the first state, and the connecting section 31 and the spreading section 32 on the nut 3 are located on the outside of the sleeve 2.

[0043] In the second state, the elastic element 21 opens radially outward and extends to the outside of the sleeve 2. The hook 22 moves from the outside of the connecting section and cooperates with the groove 33 to limit the nut 3.

[0044] In this embodiment, the bolt body 1 is rotated, causing the nut 3 to move axially. The connecting section 31 extends into the inner side of the sleeve 2. Since the elastic element 21 is provided with a hook 22 on the side near the bolt body, when the connecting section 31 extends in, it cooperates with the inclined surface of the hook 22, gradually pushing the elastic element 21 to open to both sides until the connecting section 31 is fully extended into the inner side of the sleeve 2. The hook 22 cooperates with the groove 33 to limit the nut 3.

[0045] There are two elastic elements 21, which are arranged opposite each other on both sides of the sleeve 2.

[0046] In this embodiment, two elastic elements 21 are provided, which clamp and limit the sleeve nut 3 from both sides to make the force more even.

[0047] A limiting groove 34 with the same shape but opposite direction as the hook 22 is provided on the inner side of the groove 33 to limit the engagement with the hook 22.

[0048] In this embodiment, a plurality of stepped limiting grooves 34 are also provided on the inner side of the groove 33. They are the same shape as the hook 22 but opposite in direction. In the second state, when the spreading section 32 moves to the inner side of the sleeve 2 and the elastic member 21 deforms to both sides, the hook 22 cooperates with the limiting grooves 34 on the inner side of the groove 33 in sequence to limit the elastic member 21.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An expansion bolt, characterized in that, include: Bolt body (1); The bolt body (1) penetrates the sleeve (2) and engages with the nut (3); The sleeve (2) is provided with an elastic element (21). In the first state, the elastic element (21) is located outside the nut (3). Rotate the bolt body (1) to move the nut (3) toward the bolt body (1); the elastic element (21) opens and bends to both sides, changing from the first state to the second state; the nut (3) engages with the sleeve (2).

2. The expansion bolt according to claim 1, characterized in that: The nut (3) includes a connecting section (31) and a spreading section (32). The connecting section (31) is annular and has threads on its inner side, which mesh with the bolt body (1).

3. The expansion bolt according to claim 2, characterized in that: The supporting section (32) is frustum-shaped with a through hole in the middle, and the smaller side plane is integrally connected to the connecting section (31).

4. The expansion bolt according to claim 2, characterized in that: At least one groove (33) is provided on the spreading section (32), and the groove (33) and the connecting section (31) form a stepped shape.

5. The expansion bolt according to claim 4, characterized in that: At least two slots are provided on the outer side of the sleeve (2), and the elastic element (21) is formed between the two slots. A hook (22) is provided on the side of the elastic element (21) near the bolt body (1).

6. The expansion bolt according to claim 5, characterized in that: In the first state, the radial dimension of the elastic element (21) is the same as the diameter of the sleeve (2), and the elastic element (21) is located outside the connecting section (31).

7. The expansion bolt according to claim 5, characterized in that: In the second state, the elastic element (21) opens radially outward and extends to the outside of the sleeve (2), and the hook (22) moves from the outside of the connecting section and engages with the groove (33) to limit the nut (3).

8. The expansion bolt according to claim 5, characterized in that: Two elastic elements (21) are provided, which are arranged opposite to each other on both sides of the sleeve (2).

9. The expansion bolt according to claim 5, characterized in that: The groove (33) has a limiting groove (34) with the same shape but opposite direction as the hook (22) on the inner side, which is used to limit the engagement with the hook (22).

10. The expansion bolt according to claim 1, characterized in that: A washer (4) is provided between the bolt body (1) and the sleeve (2).

Images