Expansion nut and expansion connecting piece

Abstract

The utility model discloses an expansion nut which comprises a fixed end and an expansion end communicated with the fixed end, the expansion end comprises at least two movable pieces, the movable pieces are circumferentially distributed around the central axis of the fixed end, at least one barb part is arranged on the outer wall of each movable piece, a top piece is arranged in each movable piece, the inner wall of each top piece is arranged to be a cambered surface, and the inner wall of each top piece is arranged to be a cambered surface. First mounting holes are formed among the plurality of top sheets, and inclined surfaces are arranged at the bottoms of the top sheets in the direction towards the fixed ends. The top piece is arranged in the movable piece, so that the movable piece and the top piece have enough structural strength, and structural damage caused by deformation of the movable piece when the screw is installed is avoided; an inclined face is arranged at the bottom of the top piece in the direction facing the fixed end, so that the screw can smoothly enter the first mounting hole when the screw is mounted, at least one barb part is arranged on the outer wall of the movable piece, and when the expansion end expands in the hole, the barb part can enable the expansion end to be better fixed in the hole so as to prevent a product from falling off.

Description

Technical Field

[0001] This utility model belongs to the field of connector technology, specifically relating to an expansion nut and an expansion connector. Background Technology

[0002] In existing technologies, bolt structures used in furniture generally include a bolt and a nut. A hole is drilled in the component to be installed, the bolt head is positioned on the outside of a thin-walled panel, a stud is inserted into the hole, and a nut is tightened onto the stud to achieve installation and fixation. Decorative parts or hooks are then connected to the end of the stud via threads for decorative or functional purposes. However, in the aforementioned traditional bolt structures, the threads at the tip of the expansion bolt are damaged during screwing, affecting the connection and tightening effect. Furthermore, the contact between the bolt tip and the expansion portion of the nut is not ideal during screwing, requiring greater force to achieve a tight connection, which can easily damage the expansion nut. Additionally, due to the smooth surface of the bolt, it is prone to falling off after prolonged use. Utility Model Content

[0003] The purpose of this invention is to provide an expansion nut that can solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention aims to overcome the defects in the prior art where the threads at the top of the expansion bolt are damaged during the screwing process, thus affecting the connection and fastening effect; and where the contact effect between the top of the expansion bolt and the expansion part of the nut is not ideal during the screwing process, requiring a greater force to achieve a tight connection between the expansion bolt and the expansion nut.

[0005] The first aspect of this utility model provides an expansion nut, including a fixed end and an expansion end communicating with the fixed end, the expansion end comprising:

[0006] At least two movable pieces are arranged in a circle around the central axis of the fixed end. The outer wall of each movable piece is provided with at least one barb. A top piece is provided inside the movable piece. The inner wall of the top piece is set as an arc surface. A first mounting hole is formed between the multiple top pieces. The bottom of the top piece is provided with an inclined surface facing the fixed end. When the movable pieces are configured to be connected in a circular manner, their cross-section is circular. When the top pieces are configured to be connected in a circular manner, their cross-section is circular.

[0007] Preferably, four movable pieces are provided, the top piece is correspondingly provided on the inner wall of the four movable pieces, and three barbs are provided on the outer wall of the movable pieces.

[0008] Preferably, the angle between the outer wall slope of the barb portion and the outer wall of the movable piece is 30 degrees.

[0009] Preferably, the barbs are distributed in a stepped manner on the outer wall of the movable piece.

[0010] Preferably, the fixed end is provided with a second mounting hole, the diameter of which is larger than that of the first mounting hole.

[0011] Preferably, the outer wall of the fixed end is provided with multiple reinforcing ribs in the circumferential direction.

[0012] A second aspect of this utility model provides an expansion connector, including a screw and an expansion nut as described in any of the above embodiments.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting a top plate inside the movable piece, the movable piece and the top plate have sufficient structural strength, avoiding deformation of the movable piece and structural damage when installing screws; the bottom of the top plate is provided with an inclined surface facing the fixed end, so that the screw can smoothly enter the first mounting hole when installing screws; at least one barb is provided on the outer wall of the movable piece, and when the expansion end expands inside the hole, the barb can better fix the expansion end in the hole and prevent the product from falling off. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the expansion nut provided by this utility model;

[0016] Figure 2 This is a front view of the expansion nut provided by this utility model;

[0017] Figure 3 This is a bottom view of the expansion nut provided by this utility model.

[0018] Explanation of icon numbers:

[0019] 10. Fixed end; 11. Second mounting hole; 12. Reinforcing rib; 20. Expansion end; 21. Movable piece; 22. Barb; 23. Top piece; 24. Inclined surface; 25. First mounting hole. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of this utility model, it should be understood that if the embodiments of this utility model involve directional indications, such as up, down, left, right, front, back, inside, outside, etc., the orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this embodiment of the invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can be mechanical or electrical connections. They can be direct connections or indirect connections through an intermediate medium, and can represent the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0024] like Figures 1 to 3 As shown in the figure, this application provides an expansion connector, including a screw and an expansion nut. The screw can be installed inside the expansion nut to cause the expansion nut to expand, thereby fixing the expansion nut to the object that needs to be fixed.

[0025] The expansion nut includes a fixed end 10 and an expansion end 20 communicating with the fixed end 10. In use, the expansion end 20 is inserted into the hole of the object to be fixed. The screw passes through the expansion end 20, causing the expansion end 20 to expand and tightly engage with the inner wall of the hole, thereby fixing the expansion nut.

[0026] The expansion end 20 includes a movable piece 21. At least two movable pieces 21 are provided and are distributed circumferentially around the central axis of the fixed end 10. The movable pieces 21 can move closer to or away from the central axis of the fixed end 10. When the expansion end 20 is inserted into the hole, the expansion end 20 will contract, that is, the movable pieces 21 will move closer to the axis. When the screw is installed inside the expansion end 20, the movable pieces 21 will expand outward. At least one barb 22 is provided on the outer wall of the movable piece 21. When the expansion end 20 expands inside the hole, the barb 22 can better fix the expansion end 20 in the hole and prevent the product from falling off. A top piece 23 is provided inside the movable piece 21. The top piece 23 is used to contact the screw. The inner wall of the top piece 23 is set as an arc surface to adapt to the shape of the screw. A first mounting hole 25 is formed between multiple top pieces 23. When the screw is installed into the expansion end 20, the screw is located in the first mounting hole 25. The bottom of the top piece 23 is provided with a slope 24 facing the fixed end 10. During installation, the screw first contacts the slope 24 and then enters the first mounting hole 25. The slope 24 facilitates the entry of the screw. When multiple movable pieces 21 are connected end to end, their cross-section is circular. When multiple top pieces 23 are connected end to end, their cross-section is circular. In this way, it can meet the requirements of the hole of the object and the shape of the screw. That is, both the movable piece 21 and the top piece 23 are arc-shaped piece structures.

[0027] This invention provides a top plate 23 inside the movable piece 21, giving the movable piece 21 and the top plate 23 sufficient structural strength to prevent deformation of the movable piece 21 and structural damage during screw installation. The bottom of the top plate 23 has an inclined surface 24 facing the fixed end 10, which facilitates the screw to smoothly enter the first mounting hole 25 during screw installation. At least one barb 22 is provided on the outer wall of the movable piece 21. When the expansion end 20 expands inside the hole, the barb 22 can better fix the expansion end 20 in the hole and prevent the product from falling off.

[0028] In this application, four movable pieces 21 are provided, arranged in a circle around the central axis of the fixed end 10. Four top pieces 23 are provided on the inner wall of the movable pieces 21, corresponding to the four movable pieces 21, and also arranged in a circle around the central axis of the fixed end 10. Three barbs 22 are provided on the outer wall of the movable pieces 21, arranged in a stepped pattern. The three barbs 22 make the product more stable after installation, preventing it from falling off. At the same time, it also prevents a single barb 22 from deforming and being damaged under force, thus avoiding product failure.

[0029] In one embodiment, the angle between the outer inclined surface 24 of the barb portion 22 and the outer wall of the movable piece 21 is α, and α = 30 degrees is set. By setting this angle, during the installation process, the inner wall of the hole can contact the outer inclined surface of the barb portion 22, which facilitates the expansion end 20 to smoothly enter the hole of the object to be installed.

[0030] In one embodiment, a second mounting hole 11 is provided inside the fixed end 10. The diameter of the second mounting hole 11 is larger than that of the first mounting hole 25. Taking a screw as an example, the threaded section of the screw is installed in the first mounting hole 25, and the nut part of the screw is installed in the second mounting hole 11. When the second mounting hole 11 is larger, the screw can be installed better.

[0031] To ensure the strength of the fixed end 10, multiple reinforcing ribs 12 are provided circumferentially on the outer wall of the fixed end 10.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An expansion nut, comprising a fixed end and an expansion end communicating with the fixed end, characterized in that, The expanded end includes: At least two movable pieces are arranged in a circle around the central axis of the fixed end. The outer wall of each movable piece is provided with at least one barb. A top piece is provided inside the movable piece. The inner wall of the top piece is set as an arc surface. A first mounting hole is formed between the multiple top pieces. The bottom of the top piece is provided with an inclined surface facing the fixed end. When the movable pieces are configured to be connected in a circular manner, their cross-section is circular. When the top pieces are configured to be connected in a circular manner, their cross-section is circular.

2. The expansion nut according to claim 1, characterized in that, The movable pieces are provided in four positions, and the top piece is provided on the inner wall of each of the four movable pieces. The barbs are provided on the outer wall of each movable piece in three positions.

3. The expansion nut according to claim 2, characterized in that, The angle between the outer wall slope of the barb portion and the outer wall of the movable piece is 30 degrees.

4. The expansion nut according to claim 2, characterized in that, The barbs are distributed in a stepped pattern on the outer wall of the movable piece.

5. The expansion nut according to claim 1, characterized in that, The fixed end has a second mounting hole inside, and the diameter of the second mounting hole is larger than that of the first mounting hole.

6. The expansion nut according to claim 1, characterized in that, The outer wall of the fixed end is provided with multiple reinforcing ribs in the circumferential direction.

7. An expansion connector, characterized in that, include: Screws and expansion nuts as described in any one of claims 1 to 6.

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