Self-tapping screw with combined threads

Abstract

The self-tapping screw with the combined threads comprises a first screw body and a second screw body, the first screw body comprises a first nut, a first screw rod, first external threads and internal threads, a through groove is formed in the first screw rod, and the second screw body comprises a second nut, a second screw rod and second external threads. A plurality of mounting grooves are formed in the inner wall of the second screw rod, springs are fixedly connected to the interiors of the mounting grooves, a fixing convex block is fixedly connected to one end of each spring, and a plurality of clamping grooves are formed in the inner wall of the first screw rod. After the first screw is tightened, the second screw is screwed into the first screw through the through groove, the outer diameter of the first screw rod of the first screw is expanded, meanwhile, through the mounting groove, the spring, the fixing protruding block and the clamping groove, after the fixing protruding block enters the clamping groove, the outer diameter of the first screw rod of the first screw is further expanded, and the looseness preventing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-tapping screws, in particular to a self-tapping screw with combined threads. Background Art

[0002] Self-tapping screws, also known as quick-thread screws, are quick-install fasteners made of steel with a galvanized, passivated surface. They are primarily used to connect thin metal sheets (such as steel and sawn metal). To connect, a threaded hole is first created in the connected component, and the self-tapping screw is then screwed into the threaded hole.

[0003] In the process of fixing the connecting parts, the existing self-tapping screws are prone to loosening due to repeated shaking and vibration, and may even fall off, affecting the fastening effect. Utility Model Content

[0004] The purpose of the utility model is to provide a self-tapping screw with a combined thread, which can expand the outer diameter of a first screw shank of the first screw by tightening the first screw and then screwing the second screw into the first screw through the through slot. At the same time, through the installation slot, the spring, the fixing protrusion and the clamping slot, the outer diameter of the first screw shank of the first screw is further expanded after the fixing protrusion enters the clamping slot, thereby improving the effect of preventing loosening.

[0005] To achieve the above object, a self-tapping screw with a combined thread is provided, comprising a first screw and a second screw, wherein the first screw comprises a first nut, a first screw shank, a first external thread, and an internal thread, wherein a through groove is formed inside the first screw shank, and the second screw comprises a second nut, a second screw shank, and a second external thread;

[0006] The inner wall of the second screw rod is provided with a plurality of mounting grooves, a spring is fixedly connected inside the mounting groove, one end of the spring is fixedly connected to a fixing protrusion, and the inner wall of the first screw rod is provided with a plurality of clamping grooves.

[0007] According to the self-tapping screw with combined threads, the through groove passes through the first screw rod.

[0008] According to the self-tapping screw with combined threads, the first nut is fixed above the first screw rod.

[0009] According to the self-tapping screw with combined threads, the first external thread is provided on the outer surface of the first screw shaft.

[0010] According to the self-tapping screw with combined threads, the internal threads are arranged on the inner wall of the first screw rod and are located in the through groove.

[0011] According to the self-tapping screw with combined threads, a self-tapping rice-shaped groove is formed on the upper surface of the second nut.

[0012] According to the self-tapping screw with combined threads, the second external thread is provided on the outer surface of the second screw shaft.

[0013] According to the self-tapping screw with combined threads, a gasket is provided on the outer surface of the first screw rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The self-tapping screw with a combined thread is configured such that the outer diameter of the first screw shank of the first screw expands after the first screw is tightened and then the second screw is screwed into the first screw through a through slot. At the same time, the outer diameter of the first screw shank of the first screw further expands after the fixing protrusion enters the clamping slot through the installation slot, the spring, the fixing protrusion and the clamping slot, thereby improving the effect of preventing loosening.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is a three-dimensional diagram of a self-tapping screw with a combined thread according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a self-tapping screw with a combined thread according to the present invention;

[0020] Figure 3 For the utility model Figure 2 An enlarged schematic diagram of the structure at A in the middle.

[0021] In the figure: 1, first screw; 2, through slot; 3, gasket; 4, second screw; 5, mounting slot; 6, spring; 7, fixing protrusion; 8, snap-on slot; 11, first nut; 12, first screw shank; 13, first external thread; 14, internal thread; 41, second nut; 42, self-tapping groove; 43, second screw shank; 44, second external thread. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the utility model.

[0023] See also Figure 1-3 The embodiment of the utility model provides a technical solution: a self-tapping screw with a combined thread, comprising a first screw 1 and a second screw 4, wherein the first screw 1 comprises a first nut 11, a first screw shank 12, a first external thread 13, and an internal thread 14, wherein a through groove 2 is formed inside the first screw shank 12, and the second screw 4 comprises a second nut 41, a second screw shank 43, and a second external thread 44;

[0024] The inner wall of the second screw rod 43 is provided with a plurality of mounting grooves 5, the interior of the mounting groove 5 is fixedly connected with a spring 6, and one end of the spring 6 is fixedly connected with a fixing protrusion 7. The inner wall of the first screw rod 12 is provided with a plurality of clamping grooves 8. After tightening the first screw 1, the second screw 4 is screwed into the first screw 1 through the through groove 2, so that the outer diameter of the first screw rod 12 of the first screw 1 expands. At the same time, through the mounting groove 5, the spring 6, the fixing protrusion 7, and the clamping groove 8, after the fixing protrusion 7 enters the clamping groove 8, the outer diameter of the first screw rod 12 of the first screw 1 is further expanded, thereby improving the effect of preventing loosening.

[0025] The through groove 2 passes through the first screw rod 12, the first nut 11 is fixed above the first screw rod 12, the first external thread 13 is arranged on the outer surface of the first screw rod 12, the internal thread 14 is arranged on the inner wall of the first screw rod 12, and is located in the through groove 2, the upper surface of the second nut 41 is provided with a self-tapping rice-shaped groove 42, the second external thread 44 is arranged on the outer surface of the second screw rod 43, and the outer surface of the first screw rod 12 is provided with a gasket 3. By providing the gasket 3, the first nut 11 is prevented from being damaged.

[0026] Working principle: When in use, after tightening the first screw rod 12 of the first screw 1, the second screw rod 43 of the second screw 4 is screwed into the through groove 2 to fix it, and at the same time, the outer diameter of the first screw rod 12 of the first screw 1 is expanded. After the second screw rod 43 moves downward, the fixing protrusion 7 is squeezed, causing the spring 6 to compress and the fixing protrusion 7 to enter the installation groove 5. When the clamping groove 8 of the first screw rod 12 moves to the fixing protrusion 7, the spring 6 is reset, driving the fixing protrusion 7 to enter the clamping groove 8. After the fixing protrusion 7 enters the clamping groove 8, the outer diameter of the first screw rod 12 of the first screw 1 is further expanded, thereby improving the effect of preventing loosening.

[0027] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A self-tapping screw with a combined thread, comprising a first screw (1) and a second screw (4), characterized in that: The first screw (1) comprises a first nut (11), a first screw rod (12), a first external thread (13), and an internal thread (14); a through slot (2) is provided inside the first screw rod (12); and the second screw (4) comprises a second nut (41), a second screw rod (43), and a second external thread (44); The inner wall of the second screw rod (43) is provided with a plurality of mounting grooves (5), a spring (6) is fixedly connected inside the mounting groove (5), and one end of the spring (6) is fixedly connected to a fixing protrusion (7), and the inner wall of the first screw rod (12) is provided with a plurality of clamping grooves (8).

2. A self-tapping screw with a combined thread according to claim 1, characterized in that: The through slot (2) passes through the first screw rod (12).

3. The self-tapping screw with combined threads according to claim 1, characterized in that: The first nut (11) is fixed above the first screw rod (12).

4. The self-tapping screw with combined threads according to claim 1, wherein: The first external thread (13) is provided on the outer surface of the first screw rod (12).

5. The self-tapping screw with combined threads according to claim 1, characterized in that: The internal thread (14) is arranged on the inner wall of the first screw rod (12) and is located in the through groove (2).

6. The self-tapping screw with combined threads according to claim 1, characterized in that: A self-tapping rice-shaped groove (42) is formed on the upper surface of the second nut (41).

7. The self-tapping screw with combined threads according to claim 1, characterized in that: The second external thread (44) is provided on the outer surface of the second screw rod (43).

8. The self-tapping screw with combined threads according to claim 1, characterized in that: A gasket (3) is provided on the outer surface of the first screw rod (12).

Images