Non-falling expansion bolt

Abstract

The utility model relates to a non-falling expansion bolt, and belongs to the technical field of bolts. Comprising a cross-shaped bolt and a sleeve arranged outside the cross-shaped bolt in a sleeving mode, the top of the cross-shaped bolt is connected with a screw head with a bearing part, threads are arranged on the outer wall of the sleeve, a cross-shaped groove matched with the cross-shaped bolt is formed in the inner wall of the sleeve, and a hollow expansion area with a cross-shaped opening is arranged at the front end of the sleeve. When the cross bolt is used, a wall body is firstly punched, then the sleeve is screwed into the wall body, finally, the cross bolt is knocked into the wall body by knocking the screw head, the threads of the sleeve can be embedded into an object when the first layer is expanded, the second layer is expanded to form a conical part of the sleeve, and the sleeve and the conical part are expanded for the third time. The contact area between the sleeve and the wall is increased through three times of expansion, the sleeve and the wall are firmer, the outer wall of the sleeve body is provided with the threads, the threads are used for preventing the sleeve from sliding out of an object easily, and fixing is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of expansion bolts, and particularly relates to a non-dropping expansion bolt. Background Art

[0002] An expansion bolt is a fastener widely used in the construction and industrial fields. It realizes firm fixation to a wall or other substrates through an expansion mechanism. Its working principle is to utilize the expansion sleeve at the tail of the bolt to generate a radial expansion force when the bolt is tightened, thereby tightly grasping the inside of the substrate and providing strong tensile and shear resistance. This kind of bolt is particularly suitable for situations where traditional drilling and fixation are not possible, such as hard materials like concrete and brick walls. There are various types of expansion bolts, including metal expansion bolts, plastic expansion bolts, and chemical expansion bolts, and each type has its unique application scenarios and advantages.

[0003] Existing expansion sleeves all need to drill holes larger than themselves, resulting in a relatively small contact area between the expanded expansion sleeve and the object, and finally not being strong enough. Secondly, most existing expansion sleeves are relatively smooth. When fixing an object on the ceiling, the expansion sleeve is likely to slip out of the object, making it inconvenient to fix. Summary of the Utility Model

[0004] The purpose of the utility model is to address the above-mentioned problems and deficiencies, and propose a non-dropping expansion bolt. After the sleeve expands, it has a relatively large contact area with the object, is firm and stable, and the sleeve is not likely to slip out of the object, making it convenient to fix.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a non-dropping expansion bolt, including a cross-shaped bolt 2 and a sleeve 4 sleeved outside it. A screw head 1 with a bearing part 6 is connected to the top of the cross-shaped bolt 2. The outer wall is provided with a cross-shaped convex platform, and a small inclined surface 8 is provided below the convex platform. The outer wall of the sleeve 4 is provided with threads 3, and the inner wall is provided with a cross-shaped large groove 9 that cooperates with the convex platform on the outer wall of the cross-shaped bolt 2. The front end of the sleeve 4 is provided with a hollow expansion area 11 with a cross opening.

[0006] Preferably, a large inclined surface 7 is provided at the bottom of the convex platform on the cross-shaped bolt 2, and the large inclined surface 7 and the small inclined surface 8 are arranged at intervals.

[0007] Preferably, a small groove 10 is provided below the large groove 9 on the inner wall of the sleeve 4.

[0008] Preferably, the frontmost end of the hollow expansion area 11 is a conical part 5.

[0009] Preferably, the bearing part 6 is in a flared shape.

[0010] Preferably, the length of the hollow expansion zone 11 is longer than that of the large groove 9, and the width of the cross-opening of the hollow expansion zone 11 is the same as the width of the cross-shape of the large groove 9.

[0011] The beneficial effects of the present utility model are as follows: First, drill a hole in the wall, then screw the sleeve into the wall, and finally, by knocking the screw head, drive the cross bolt into the wall. For the first expansion, the thread of the sleeve will be embedded in the object. For the second expansion, it is the expansion of the sleeve body, where the large inclined surface enters the hollow expansion zone. For the third expansion, it is the small inclined surface entering the hollow expansion zone. Through three expansions, the contact area between the sleeve and the wall is increased, making it more firm with the wall. Moreover, the outer wall of the sleeve body is provided with threads to prevent the sleeve from easily slipping out of the object, facilitating fixation. Description of the Drawings

[0012] Figure 1 is the overall assembly drawing of the present utility model;

[0013] Figure 2 is the structural schematic diagram of the sleeve of the present utility model;

[0014] Figure 3 is the structural schematic diagram of the cross bolt of the present utility model;

[0015] Figure 4 is the cross-sectional view of the sleeve of the present utility model;

[0016] Figure 5 is the overall cross-sectional view of the present utility model.

[0017] Description of the reference numerals: 1, screw head; 2, cross bolt; 3, thread; 4, sleeve; 5, conical part; 6, bearing part; 7, large inclined surface; 8, small inclined surface; 9, large groove; 10, small groove; 11, hollow expansion zone. Detailed Description of the Preferred Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0019] Embodiment 1: As Figures 1-5 shown, a non-detachable expansion bolt includes a cross bolt 2 and a sleeve 4 sleeved outside it. The top of the cross bolt 2 is connected with a screw head 1 with a bearing part 6, and the outer wall is provided with a cross-shaped boss. The lower part of the boss is provided with a small inclined surface 8. The outer wall of the sleeve 4 is provided with threads 3, and the inner wall is provided with a cross-shaped large groove 9 that cooperates with the boss on the outer wall of the cross bolt 2. The front end of the sleeve 4 is provided with a hollow expansion zone 11 with a cross opening.

[0020] Further, a large inclined surface 7 is provided at the bottom of the convex platform on the cross-shaped bolt 2, and the large inclined surface 7 and the small inclined surface 8 are arranged at intervals.

[0021] Further, a small groove 10 is provided at the lower part of the large groove 9 on the inner wall of the sleeve 4, and the small groove 10 is used to catch the large inclined surface 7.

[0022] Further, the front end of the hollow expansion area 11 is a conical part 5, which helps to expand more smoothly.

[0023] Further, the bearing part 6 is in a flared shape, which is easier to fix an object.

[0024] Further, the length of the hollow expansion area 11 is longer than the length of the large groove 9, and the width of the cross opening of the hollow expansion area 11 is the same as the width of the cross shape of the large groove 9. The longer the length of the hollow expansion area 11, the higher the large groove 9 and the small groove 10 will be, and it will expand in advance, corresponding to relatively thin objects.

[0025] The working principle of the present utility model is as follows: First, a hole is drilled in the wall, and the diameter of the hole is the same as the diameter of the sleeve 4. Align the conical part 5 in front of the sleeve 4 with the hole opening, and then screw the sleeve 4 into the object by the screw head 1. This is because there are a large groove 9 and a small groove 10 inside the sleeve 4. When the cross-shaped bolt 2 reaches the hollow expansion area 11, the cross-shaped bolt 2 will not slide when the cross-shaped bolt 2 is rotated, and the cross-shaped bolt 2 will not fall out of the sleeve 4. In addition, the sleeve 4 with the thread 3 will expand the hole to achieve the first expansion and can be better combined with the object.

[0026] Then, use a nail hammer to strike the top of the cross-shaped bolt 2. Under the action of force, the large inclined surface 7 of the cross-shaped bolt 2 will first slide into the small groove 10. At this time, the large inclined surface 7 of the cross-shaped bolt 2 will pass through the cross-shaped hollow expansion area 11, and the hollow expansion area 11 will expand outwards due to the action of the large inclined surface 7, causing the conical part 5 of the sleeve 4 to split into four parts and apply forces in four directions respectively. Subsequently, the small inclined surface 8 will first slide into the large groove 9 to expand the body of the sleeve 4, and then the small inclined surface 8 will slide into the small groove 10 to expand the four parts of the conical part 5 again. At the same time, the conical structures of these four parts help to expand more smoothly. It should be noted that the latter two expansions are not carried out simultaneously. There is a certain distance between the small inclined surface 8 and the large groove 9, while there is contact between the large inclined surface 7 and the small groove 10. Therefore, the large inclined surface 7 will first reach the expanded hollow area 11.

[0027] When drilling holes on a horizontal surface or the ground, during the drilling process, dust often accumulates in the holes, which is difficult to clean. As a result, when an expansion bolt is inserted, the depth cannot reach the planned depth. Therefore, the present utility model adopts a hollow expansion area 11 with a conical part 5 at the front end to solve this problem. After screwing the sleeve 4 into the hole, the dust will be in the hollow expansion area 11, so that the sleeve 4 can reach the predetermined depth. Then, by knocking on the screw head 1 to expand the hollow expansion area 11, the predetermined effect can be achieved.

[0028] For an object that needs to be fixed to the ceiling, after drilling a hole in the ceiling, the existing expansion bolts cannot be directly inserted and are prone to slipping out. The sleeve 4 of the present application is attached with threads 3. After screwing the threads 3 in, the entire expansion bolt will not slip out of the hole.

[0029] For the expansion sleeve provided in the present application, the sleeve 4 is screwed into the previously opened hole from the screw head 1 of the cross-shaped bolt 2. The outer ring of threads 3 will fix the sleeve 4 to the object and prevent the sleeve from falling off. The cross-shaped bolt 2 provided in the present application abandons the traditional nut and uses the screw head 1 for fixation, solving the problem that the bolt is prone to falling into the hole when the nut is removed. The method of using the screw head 1 also abandons the traditional gasket. Using a gasket between the fixed object and the wall can protect the object, but the operation is inconvenient. The bearing part 6 of the present application solves this problem. The object can be directly placed in front of the bearing part 6. The small groove 10 inside the sleeve 4 catches the large inclined surface 7 of the cross-shaped bolt 2, so that the cross-shaped bolt 2 will not slip off. The hollow expansion area 11 with a cross-shaped opening in front of the sleeve 4 solves the problem of dust remaining in the hole after drilling.

[0030] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A non-dropping expansion bolt, characterized in that: It includes a cross-shaped bolt (2) and a sleeve (4) sleeved outside it. A screw head (1) with a bearing part (6) is connected to the top of the cross-shaped bolt (2). The outer wall is provided with a cross-shaped boss, and a small inclined surface (8) is provided at the lower part of the boss. The outer wall of the sleeve (4) is provided with a thread (3), and the inner wall is provided with a cross-shaped large groove (9) that matches the boss on the outer wall of the cross-shaped bolt (2). The front end of the sleeve (4) is provided with a hollow expansion area (11) with a cross opening.

2. The expanding bolt that does not fall off according to claim 1, characterized in that: A large inclined surface (7) is provided at the bottom of the boss on the cross-shaped bolt (2), and the large inclined surface (7) and the small inclined surface (8) are arranged at intervals.

3. The expanding bolt that does not fall off according to claim 1, characterized in that: A small groove (10) is provided at the lower part of the large groove (9) on the inner wall of the sleeve (4).

4. The expanding bolt that does not fall off according to claim 1, wherein: The frontmost end of the hollow expansion area (11) is a conical part (5).

5. The expanding bolt that does not fall off according to claim 1, wherein: The bearing part (6) is trumpet-shaped.

6. The expanding bolt that does not fall off according to claim 1, characterized in that: The length of the hollow expansion area (11) is longer than the length of the large groove (9), and the width of the cross opening of the hollow expansion area (11) is the same as the width of the cross shape of the large groove (9).

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