Expansion screw easy to disassemble
By designing easily removable expansion bolts and utilizing the combination of screw rods, outer cylinders, and fixing bolts, the problem of damage to the wall during the removal of expansion bolts is solved, enabling complete disassembly and reuse of the bolts.
Patent Information
- Application Number
- CN202520606923.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-04-02
AI Technical Summary
Existing expansion bolts are prone to damaging the wall when removed and cannot be reused, making them difficult to remove effectively.
An easily detachable expansion screw was designed. Through the cooperation of the screw rod, outer cylinder and fixing bolt, the expansion part can be retracted and the screw can be completely removed by using a wrench and hexagonal nut, avoiding damage to the wall and the screw.
It allows for the complete removal of expansion bolts, protecting the integrity of the wall and the bolts, and facilitating reuse.
Smart Images
Figure CN223794447U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of expansion screw technology, and in particular to an easily detachable expansion screw. Background Technology
[0002] An expansion bolt is a special type of fastener primarily used to fix objects to walls, floors, or columns. It works by expanding the expansion tube within a hole, creating a frictional gripping force that achieves a secure fixation.
[0003] Existing expansion screws require drilling holes around them with an electric drill or using a shearing device to cut off the protruding part of the screw when removing them. This not only easily damages the wall and affects the appearance, but also makes the expansion screw unusable in the future. Therefore, we provide an easy-to-remove expansion screw. Utility Model Content
[0004] To address the problem in the background art where expansion screws are difficult to remove after installation, this utility model provides an easily removable expansion screw.
[0005] This utility model is achieved using the following technical solution: an easily detachable expansion screw, comprising a housing, an expansion part being fixedly connected circumferentially at equal intervals at the bottom of the housing, a screw rod being threadedly connected inside the housing with both ends of the screw rod extending to the outside of the housing, a protrusion being fixedly connected to the bottom end of the screw rod, a hexagonal nut being threadedly connected to the upper outer side of the screw rod, and an outer cylinder being threadedly connected to the outer side of the housing.
[0006] As a further improvement to the above solution, screw holes one is provided on both sides of the top annular protrusion of the outer shell and on both sides of the top annular protrusion of the outer cylinder. Connectors are fixedly connected to both sides of the hexagonal nut. Screw holes two are provided on the connectors. The same fixing bolt is threaded between the screw holes two on the same side and the two sets of screw holes one.
[0007] As a further improvement to the above solution, the expansion part is an arc-shaped plate structure.
[0008] As a further improvement to the above solution, the outer surface of the expansion part is provided with strip-shaped anti-slip protrusions at equal intervals.
[0009] As a further improvement to the above solution, the top end of the screw is fixedly connected to a fixed end with a regular hexagonal prism structure.
[0010] As a further improvement to the above solution, the protrusion is designed as a frustum-shaped structure.
[0011] As a further improvement to the above solution, the bottom edge of the protrusion is rounded.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] This invention removes the two sets of fixing bolts, freeing the screw from its restraint. After clamping and fixing the fixed end with a wrench, the hexagonal nut is loosened and removed. By rotating the screw, the protrusion is pushed deeper into the hole. By rotating the annular protrusion on the outer cylinder, and with the threaded connection between the outer cylinder and the outer shell, the outer cylinder is moved closer to the expansion part. During the movement, the outer cylinder can squeeze and push the expanded part inward, thus allowing the expansion screw to be completely removed from the hole without damaging the wall or the expansion screw itself. This effectively avoids the problem of existing expansion screws being difficult to disassemble after installation. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0015] Figure 2 This is a three-dimensional structural diagram of the outer shell of this utility model, viewed from below.
[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the screw of this utility model;
[0017] Figure 4 This is a top view of the three-dimensional structure of the outer cylinder of this utility model;
[0018] Figure 5 This is a three-dimensional structural diagram of the hexagonal nut of this utility model;
[0019] Figure 6 This is a top view of the expansion section of this utility model.
[0020] Explanation of key symbols:
[0021] 1. Outer shell; 2. Expansion section; 3. Screw; 4. Protrusion; 5. Hex nut; 6. Outer cylinder; 7. Screw hole one; 8. Connector; 9. Fixing bolt; 10. Strip-shaped anti-slip protrusion; 11. Fixed end. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0023] Example 1:
[0024] Please combine Figure 1-6This embodiment of an easily detachable expansion screw includes a housing 1. An expansion portion 2 is circumferentially fixedly connected to the bottom of the housing 1 at equal intervals. A screw 3 is threadedly connected internally to the housing 1, with both ends of the screw 3 extending to the outside of the housing 1. A protrusion 4 is fixedly connected to the bottom end of the screw 3. A hexagonal nut 5 is threadedly connected to the upper outer side of the screw 3. An outer cylinder 6 is threadedly connected to the outside of the housing 1. Screw holes 7 are provided on both sides of the annular protrusion at the top of the housing 1 and on both sides of the annular protrusion at the top of the outer cylinder 6. Both sides of the hexagonal nut 5 are fixedly connected... A connector 8 is provided, and a screw hole 2 is provided on the connector 8. The screw hole 2 on the same side is threadedly connected to the two sets of screw holes 7 with the same fixing bolt 9. The expansion part 2 is an arc-shaped plate structure, which is convenient to fit the inner wall of the hole. The outer surface of the expansion part 2 is provided with strip-shaped anti-slip protrusions 10 at equal intervals, which can increase the friction between the expansion part 2 and the inner wall of the hole. The top of the screw 3 is fixedly connected to a fixed end 11 with a regular hexagonal prism structure. The protrusion 4 is designed with a frustum-shaped structure, which is convenient to push the expansion part 2 outward when the protrusion 4 moves.
[0025] The implementation principle of an easily detachable expansion screw in this application embodiment is as follows: During installation, firstly, drill a hole of appropriate diameter and depth on the wall according to the size of the expansion screw. Then, place the expansion screw in the hole with the front end protruding outside the hole. Subsequently, use a wrench to clamp and fix the protruding part. Then, rotate the screw rod 3. Rotating the screw rod 3 will cause the protrusion 4 to move. The movement of the protrusion 4 will push the expansion part 2 to expand outward until it is in close contact with the inner wall of the hole, thereby realizing the installation of the expansion screw. Finally, put the hexagonal nut 5 on the screw rod 3, use a wrench to clamp the fixing end 11, and rotate the hexagonal nut 5 to approach the annular protrusion on the outer shell 1. When the second screw hole on the connector 8 is aligned with the first screw hole 7 on the same side, the fixing bolt 9 can be installed.
[0026] During disassembly, first loosen and remove the two sets of fixing bolts 9 to release the restriction on the screw 3. Then, use a wrench to clamp and fix the fixed end 11, loosen and remove the hexagonal nut 5. Next, rotate the screw 3 in the opposite direction to make the protrusion 4 go deeper into the hole. Then, rotate the annular protrusion on the outer cylinder 6. With the threaded connection between the outer cylinder 6 and the outer shell 1, the outer cylinder 6 can be moved closer to the expansion part 2. During the movement, the outer cylinder 6 can squeeze and push the expanded expansion part 2 to retract inward. Finally, pull the expansion screw out of the hole to complete the disassembly. There is no need to damage the wall or the expansion screw, which effectively avoids the problem that the existing expansion screws are difficult to disassemble after installation.
[0027] Example 2:
[0028] This embodiment is an improvement on embodiment 1, in that the bottom edge of the protrusion 4 is rounded.
[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A removable expansion screw, characterized in that, Including the shell (1), the bottom of the shell (1) is fixedly connected with the expansion part (2) equidistantly and circumferentially, the inside of the shell (1) is threadedly connected with the screw rod (3) and both ends of the screw rod (3) extend to the outside of the shell (1), the bottom end of the screw rod (3) is fixedly connected with the protruding block (4), the upper part of the screw rod (3) is threadedly connected with the hexagon nut (5) on the outside, and the outside of the shell (1) is threadedly connected with the outer cylinder (6).
2. A self-dismantling expansion screw according to claim 1, characterized in that Both sides of the top annular protrusion of the shell (1) and both sides of the top annular protrusion of the outer cylinder (6) are provided with screw holes (7), both sides of the hexagon nut (5) are fixedly connected with connecting pieces (8), screw holes (8) are formed in the connecting pieces (8), and the same side screw holes (8) and two groups of screw holes (7) are threadedly connected with the same fixing bolt (9).
3. A self-dismantling expansion screw according to claim 1, wherein The expansion part (2) is an arc-shaped plate structure.
4. A self-dismantling expansion screw according to claim 1, wherein Strip-shaped anti-skid protrusions (10) are arranged equidistantly on the outer surface of the expansion part (2).
5. A self-dismantling expansion screw according to claim 1, wherein The top end of the screw rod (3) is fixedly connected with a fixed end (11) in a regular hexagonal prism structure.
6. A self-dismantling expansion screw according to claim 1, wherein The protruding block (4) is designed in a frustum structure.
7. A self-dismantling expansion screw according to claim 1, wherein The bottom edge of the protruding block (4) is provided with a round corner.