A type of double-threaded screw

Abstract

This utility model discloses a double-threaded screw, including a first end and a second end. The first end has a locking part that cooperates with an external tool, and the second end is used to fix it to a mounting surface. From the first end to the second end, the double-threaded screw has an independent first thread and a second thread, as well as a transition part connecting the first and second thread. The end of the second thread relative to the first thread has an expansion part, which gradually expands outward away from the first thread and is fixed to the mounting surface. This utility model can fix the object to be fixed to the first thread or the second thread, and by fixing it to the mounting surface through the expansion part, increase the fixing area and ensure a firm fixation.

Description

Technical Field

[0001] This utility model relates to a double-threaded screw, belonging to the field of screws. Background Technology

[0002] Screws, as a common type of fastener, are widely used to fix various objects to mounting surfaces (such as walls, plates, profiles, etc.). Traditional fastening screws are usually single-threaded rod-shaped structures that are screwed into objects and eventually into pre-drilled holes in the mounting surface, relying on the friction between the thread and the hole wall to achieve fixation.

[0003] However, this traditional screw has revealed significant limitations in many application scenarios:

[0004] 1. Insufficient anchoring force in low-strength materials: When the mounting surface is made of low-strength materials such as gypsum board, hollow bricks, aerated concrete, or thin wood panels,

[0005] 2. The engagement force between the screw threads and the material is limited. When subjected to tension perpendicular to the mounting surface or long-term vibration, the screw is prone to loosening, stripping, or even being pulled out of the mounting surface, leading to fixation failure.

[0006] 2. Poor Fixing Reliability: In traditional fixing methods, screws mainly serve a connecting function, and their firmness largely depends on the strength of the mounting surface material itself. For fixing tasks that need to bear weight or withstand significant stress, this single fixing method is risky and cannot provide a stable and reliable fixing effect.

[0007] 3. Requires complex auxiliary parts: To improve the fixing ability on fragile mounting surfaces, existing technologies typically use assemblies such as expansion bolts and anchors. While these solutions can improve the anchoring force to a certain extent, they require the pre-embedding of plastic or metal sleeves, the installation process is cumbersome, the dimensional accuracy requirements of the mounting holes are high, and the overall cost is high. Furthermore, the presence of multiple parts increases the number of potential failure points.

[0008] In view of this, it is indeed necessary to improve the existing double-threaded screws to solve the above problems. Utility Model Content

[0009] To solve the above-mentioned technical problems, this utility model provides a double-threaded screw, which can solve at least one of the problems of existing screws in low-strength materials: insufficient anchoring force, poor fixing reliability, and the need for complex auxiliary parts.

[0010] The technical solution of this utility model is:

[0011] A double-threaded screw includes a first end and a second end. The first end is provided with a locking portion that cooperates with an external tool. The second end is used to fix it to a mounting surface. In the direction from the first end to the second end, the double-threaded screw has a first threaded portion and a second threaded portion that are independent of each other, as well as a transition portion that connects the first threaded portion and the second threaded portion. The second threaded portion has an expansion portion at one end opposite to the first threaded portion. The expansion portion gradually expands outward away from the first threaded portion and is fixed to the mounting surface.

[0012] As a further improvement of this utility model, the expansion portion is a trumpet shape that gradually expands outward along the axial direction of the double-threaded screw.

[0013] As a further improvement of this utility model, a fixing part is provided between the second threaded part and the expansion part, and the fixing part is used to fix the expansion part to the second threaded part.

[0014] As a further improvement of this utility model, the second threaded portion has a positioning portion that cooperates with the fixing portion. The positioning portion is located on the side of the fixing portion relative to the expansion portion and can move relative to the second threaded portion in a direction close to or away from the fixing portion.

[0015] As a further improvement of this utility model, the positioning part is a nut, and the shape of the fixing part is adapted to the nut.

[0016] As a further improvement of this utility model, the fixing part and the expansion part are integrally formed and have a contact surface that abuts against the expansion part.

[0017] As a further improvement of this utility model, the outer peripheral surface of the expansion portion is an arc-shaped surface, and the shape of the contact surface is adapted to the arc-shaped surface.

[0018] As a further improvement of this utility model, the transition part is butterfly-shaped and has a first butterfly-shaped part connected to the first threaded part, a second butterfly-shaped part connected to the second threaded part, and a transfer part connecting the first butterfly-shaped part and the second butterfly-shaped part. The transfer part is cylindrical in whole.

[0019] As a further improvement of this utility model, in the direction from the first end to the second end, the cross-sectional shape of the first butterfly portion gradually decreases to be the same as the cross-sectional shape of the transfer portion, and the cross-sectional shape of the second butterfly portion gradually increases from being the same as the cross-sectional shape of the transfer portion.

[0020] As a further improvement of this utility model, a buffer portion is provided between the locking portion and the first threaded portion.

[0021] The beneficial technical effects of this utility model are as follows: This utility model solves the problem of insufficient anchoring force of existing single-threaded screws in low-strength materials by setting an independent first threaded part and a second threaded part in the direction from the first end to the second end, as well as a transition part connecting the first threaded part and the second threaded part; In addition, an expansion part is provided at one end of the second threaded part relative to the first threaded part, and the expansion part gradually expands outward away from the first threaded part and is fixed to the mounting surface, thereby solving the problem of poor fixing reliability of existing screws. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a double-threaded screw conforming to a preferred embodiment of the present utility model.

[0023] Figure 2 yes Figure 1 A magnified view of the center circle. Detailed Implementation

[0024] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] Please see Figures 1 to 2 As shown, this utility model discloses a double-threaded screw 100, which includes a first end 10 and a second end 20. The first end 10 is provided with a locking part 1 that cooperates with an external tool, and the second end 20 is used to fix it to a mounting surface 200. The locking part 1 is a cross-shaped hole that can be used for external screwdrivers.

[0026] In this embodiment, the double-threaded screw 100 has a first threaded portion 2 and a second threaded portion 3 that are independent of each other, and a transition portion 4 that connects the first threaded portion 2 and the second threaded portion 3. By providing the first threaded portion 2 and the second threaded portion 3, the problem of insufficient anchoring force of existing single-threaded screws in low-strength materials is solved. Preferably, a buffer portion 6 is provided between the locking portion 1 and the first threaded portion 2.

[0027] The transition portion 4 is butterfly-shaped and has a first butterfly-shaped portion 41 connected to the first threaded portion 2, a second butterfly-shaped portion 42 connected to the second threaded portion 3, and a transfer portion 43 connecting the first butterfly-shaped portion 41 and the second butterfly-shaped portion 42. The transfer portion 43 is cylindrical in shape. The transition portion 4 has a flounder-shaped design, which can increase the stability of the connection.

[0028] Preferably, in the direction from the first end 10 to the second end 20, the cross-sectional shape of the first butterfly portion 41 gradually decreases to be the same as the cross-sectional shape of the transfer portion 43, and the cross-sectional shape of the second butterfly portion 42 gradually increases from being the same as the cross-sectional shape of the transfer portion 43.

[0029] The second threaded portion 3 has an expansion portion 5 at one end relative to the first threaded portion 2. The expansion portion 5 gradually expands outward away from the first threaded portion 2 and is fixed to the mounting surface 200. In this embodiment, the expansion portion 5 is a trumpet shape that gradually expands outward along the axial direction of the double-threaded screw 100. That is, it increases the contact area with the mounting surface 200, thereby ensuring that the expansion portion 5 is firmly fixed to the mounting surface 200 and enhancing its stability.

[0030] A fixing part 7 is provided between the second threaded portion 3 and the expansion portion 5, the fixing part 7 being used to fix the expansion portion 5 to the second threaded portion 3. In this embodiment, the fixing part 7 and the expansion portion 5 are integrally formed, having a contact surface 71 that abuts against the expansion portion 5. The outer peripheral surface of the expansion portion 5 is an arc-shaped surface, and the shape of the contact surface 71 is adapted to the arc-shaped surface. The arc-shaped surface can disperse the force during the fixing process between the expansion portion 5 and the mounting surface 200, ensuring its stability.

[0031] The second threaded portion 3 has a positioning portion 8 that mates with the fixing portion 7. The positioning portion 8 is located on the side of the fixing portion 7 opposite to the expansion portion 5 and can move relative to the second threaded portion 3 in a direction closer to or farther from the fixing portion 7. Preferably, both the fixing portion 7 and the positioning portion 8 have threads corresponding to the second threaded portion 3, so they can move relative to the second threaded portion 3 through contact. The positioning portion 8 and the fixing portion 7 can be used to fix the object to be installed, or the fixing portion 7 and the expansion portion 5 can be fixed to the second threaded portion 5 through the positioning portion 8 and the fixing portion 7, without limitation. The positioning portion 8 is a nut, and the shape of the fixing portion 7 is adapted to the nut.

[0032] In summary, the double-threaded screw 100 of this utility model solves the problem of insufficient anchoring force of existing single-threaded screws in low-strength materials by providing an independent first threaded portion 2 and a second threaded portion 3 in the direction from the first end 10 to the second end 20, and a transition portion 4 connecting the first threaded portion 2 and the second threaded portion 3. In addition, the second threaded portion 3 is provided with an expansion portion 5 at one end relative to the first threaded portion 2. The expansion portion 5 gradually expands outward away from the first threaded portion 2 and is fixed to the mounting surface 200, thereby solving the problem of poor fixing reliability of existing screws.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A double-threaded screw, characterized in that, The screw includes a first end and a second end. The first end is provided with a locking part that cooperates with an external tool. The second end is used to fix it to the mounting surface. In the direction from the first end to the second end, the double-threaded screw has a first threaded part and a second threaded part that are independent of each other, as well as a transition part that connects the first threaded part and the second threaded part. The second threaded part has an expansion part at one end relative to the first threaded part. The expansion part gradually expands outward away from the first threaded part and is fixed to the mounting surface.

2. The double-threaded screw according to claim 1, characterized in that, The expansion portion is a trumpet shape that gradually expands outward along the axial direction of the double-threaded screw.

3. The double-threaded screw according to claim 1, characterized in that, A fixing part is provided between the second threaded portion and the expansion portion, and the fixing part is used to fix the expansion portion to the second threaded portion.

4. The double-threaded screw according to claim 3, characterized in that, The second threaded portion has a positioning portion that mates with the fixing portion. The positioning portion is located on the side of the fixing portion relative to the expansion portion and is movable relative to the second threaded portion in a direction closer to or further away from the fixing portion.

5. The double-threaded screw according to claim 4, characterized in that, The positioning part is a nut, and the shape of the fixing part is adapted to the nut.

6. The double-threaded screw according to claim 3, characterized in that, The fixing part and the expansion part are integrally formed and have a contact surface that abuts against the expansion part.

7. The double-threaded screw according to claim 6, characterized in that, The outer peripheral surface of the expansion portion is an arc-shaped surface, and the shape of the contact surface is adapted to the arc-shaped surface.

8. The double-threaded screw according to claim 1, characterized in that, The transition portion is butterfly-shaped and has a first butterfly portion connected to the first threaded portion, a second butterfly portion connected to the second threaded portion, and a transfer portion connecting the first butterfly portion and the second butterfly portion. The transfer portion is cylindrical in shape.

9. The double-threaded screw according to claim 8, characterized in that, In the direction from the first end to the second end, the cross-sectional shape of the first butterfly portion gradually decreases until it is the same as the cross-sectional shape of the transfer portion, and the cross-sectional shape of the second butterfly portion gradually increases from the point where it is the same as the cross-sectional shape of the transfer portion.

10. The double-threaded screw according to claim 1, characterized in that, A buffer portion is provided between the locking portion and the first threaded portion.

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