Self-tapping tail-cutting screw

Abstract

The utility model discloses a self-tapping tail-cutting screw, and relates to the field of fasteners, the self-tapping tail-cutting screw comprises a threaded rod, one end of the top of the threaded rod is fixedly provided with a base plate, the top of the base plate is fixedly provided with a screw head, the screw head is provided with a cross square groove, the tail of the threaded rod is provided with a cutting part, and the threaded rod is internally provided with a reinforcing mechanism. A positioning plate is hammered through an external tool, at the moment, a connecting column and a plurality of second semicircular blocks can move downwards, the second semicircular blocks move downwards to drive corresponding first semicircular blocks and a plurality of reinforcing columns to move accordingly, the reinforcing columns move to push corresponding reinforcing cones to move to the outside, and then the reinforcing cones are driven to move to the outside. The multiple reinforcing cones can abut against the interior of the mounting hole where the threaded rod is located, the self-tapping tail-cutting screw can be located in the mounting hole more firmly and stably, and the mounting stability and firmness of the self-tapping tail-cutting screw are improved.

Description

Technical Field

[0001] This application relates to the field of fasteners, and more particularly to a self-tapping self-cutting screw. Background Technology

[0002] Self-tapping self-cutting screws are a special type of self-tapping screw with a cutting groove or blade at the tail, which can cut the corresponding thread during screwing, thus adapting to the connected parts of different materials and improving the connection effect.

[0003] Traditional self-tapping screws require drilling a threaded hole in the connected parts before screwing the screw into the hole. However, existing self-tapping screws tend to loosen over time after installation, so the stability and firmness of the self-tapping screws after installation can be further improved. Utility Model Content

[0004] To improve the stability and firmness of self-tapping self-cutting screws after installation, this application provides a self-tapping self-cutting screw.

[0005] The self-tapping self-cutting screw provided in this application adopts the following technical solution: a self-tapping self-cutting screw includes a threaded rod, a washer plate is fixedly installed at one end of the threaded rod, a screw head is fixedly installed at the top of the washer plate, a cross-shaped square groove is opened on the screw head, a cutting part is provided at the tail of the threaded rod, a reinforcing mechanism is provided inside the threaded rod, and a driving mechanism for driving the reinforcing mechanism to perform installation is provided on the screw head.

[0006] The reinforcement mechanism includes a circular hole inside the threaded rod, the circular hole extending to the outside of the pad and the screw head, a plurality of reinforcing columns are provided in the circular hole, a first semi-circular block is fixedly installed at one end of each of the plurality of reinforcing columns, a plurality of sliding holes corresponding to the reinforcing columns are provided on one side of the outer surface of the threaded rod, and a reinforcing cone is fixedly installed at one end of each of the plurality of reinforcing columns.

[0007] By adopting the above technical solution, multiple reinforcing columns move and push the corresponding reinforcing cones to move to the outside, so that the multiple reinforcing cones can abut against the mounting hole where the threaded rod is located, making the self-tapping screw more firmly and stably located in the mounting hole, thus improving the stability and firmness of the self-tapping screw installation.

[0008] Preferably, the lateral length of the first semicircular block is greater than the width of the sliding hole, and the circular hole and the sliding hole are connected.

[0009] By adopting the above technical solution, and using the circular hole and sliding hole as a connection, installation and use are possible.

[0010] Preferably, the driving mechanism includes a plurality of second semicircular blocks disposed in a circular hole, each of the plurality of second semicircular blocks having the same connecting hole, each of the connecting holes having the same connecting column fixedly installed therein, and a positioning plate fixedly installed at one top end of the connecting column.

[0011] By adopting the above technical solution, the positioning plate is hammered by an external tool. At this time, the connecting column and multiple second semicircular blocks will move downward. The downward movement of the multiple second semicircular blocks will drive the corresponding first semicircular block and multiple reinforcing columns to move as well.

[0012] Preferably, each of the first semicircular blocks is adapted to the corresponding second semicircular block.

[0013] By adopting the above technical solution, multiple first semicircular blocks are adapted to each other with corresponding second semicircular blocks, thus enabling driving and use.

[0014] Preferably, the width of the positioning plate is greater than the width of the circular hole, and multiple reinforcing teeth are fixedly installed on the bottom of the pad.

[0015] By adopting the above technical solution and setting reinforcing teeth, the firmness of the connection with the substrate can be strengthened.

[0016] Preferably, the top of the screw head has two symmetrically formed locking grooves, and a first wedge block is slidably installed in each of the two locking grooves. Two second wedge blocks that are adapted to the corresponding first wedge blocks are symmetrically fixedly installed on the side of the positioning plate near the locking groove.

[0017] By adopting the above technical solution, the positioning plate can be positioned and installed by the cooperation of the second wedge block and the first wedge block, thereby preventing the positioning plate from shaking after installation and improving its stability and firmness during later use.

[0018] Preferably, a limiting groove is formed in the snap-fit ​​groove, a limiting block is slidably installed in the limiting groove, the limiting block is fixedly connected to the first wedge block, and the positioning plate covers the snap-fit ​​groove.

[0019] By adopting the above technical solution, the limiting block can be slidably installed inside the limiting groove, thereby playing a role in assisting the installation of the limiting block.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application employs the cooperation of reinforcing cones, etc., and by hammering the positioning plate with an external tool, the connecting column and multiple second semicircular blocks will move downward. The downward movement of the multiple second semicircular blocks will drive the corresponding first semicircular blocks and multiple reinforcing columns to move as well. The movement of the multiple reinforcing columns will push the corresponding reinforcing cones to move to the outside, so that the multiple reinforcing cones can abut against the mounting hole where the threaded rod is located, so that the self-tapping screw can be more firmly and stably located in the mounting hole, thereby improving the stability and firmness of the self-tapping screw installation.

[0022] 2. This application employs the cooperation of a first wedge block, etc., and the positioning plate, through the cooperation of a second wedge block and a first wedge block, can complete the positioning and installation of the positioning plate, thereby preventing the positioning plate from shaking after installation, thus improving the stability and firmness during later use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a self-tapping self-cutting screw according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram illustrating the screw head structure, representing a key embodiment of this application.

[0025] Figure 3 This is a schematic diagram illustrating the partial unfolded structure of the screw head, which is a key feature of this application embodiment.

[0026] Figure 4 This is a schematic diagram illustrating the partial unfolding structure of the screw, which is a key feature of this application embodiment.

[0027] Figure 5 This is a schematic diagram illustrating the main reinforcement structure in the embodiments of this application;

[0028] Figure 6 This is a partial unfolded schematic diagram illustrating the main embodiment of the reinforcement structure in this application;

[0029] Reference numerals: 1. Threaded rod; 2. Washer plate; 3. Screw head; 4. Cutting part; 5. Reinforcing tooth; 6. Cross-shaped square groove; 7. Positioning plate; 8. Round hole; 10. Snap-fit ​​groove; 11. Sliding hole; 12. Reinforcing cone; 13. Reinforcing column; 14. First semicircular block; 15. Second semicircular block; 16. Connecting column; 17. Connecting hole; 18. First wedge block; 19. Second wedge block; 20. Limiting groove; 21. Limiting block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0031] This application discloses a self-tapping self-cutting screw.

[0032] Reference Figure 1-3 A self-tapping self-cutting screw includes a threaded rod 1, a washer 2 fixedly installed at one end of the threaded rod 1, a screw head 3 fixedly installed on the top of the washer 2, a cross-shaped square groove 6 opened on the screw head 3, a cutting part 4 opened at the tail of the threaded rod 1 (the cutting part 4 is prior art, so its specific structure and usage are not described in detail), a reinforcing mechanism set in the threaded rod 1, and a positioning mechanism set on the reinforcing mechanism.

[0033] The reinforcement mechanism includes a circular hole 8 inside the threaded rod 1, the circular hole 8 extending to the outside of the pad 2 and the screw head 3, multiple reinforcing posts 13 disposed in the circular hole 8, and a first semicircular block 14 fixedly installed at one end of each of the multiple reinforcing posts 13, a sliding hole 11 on one side of the outer surface of the threaded rod 1 and corresponding to the multiple reinforcing posts 13, and multiple reinforcing cones 12 fixedly installed at one end of the multiple reinforcing posts 13. The lateral length of the first semicircular block 14 is greater than the width of the sliding hole 11, and the circular hole 8 and the sliding hole 11 are connected.

[0034] In use, the movement of multiple reinforcing columns 13 will push the corresponding reinforcing cones 12 to move to the outside, so that the multiple reinforcing cones 12 can abut against the mounting hole where the threaded rod 1 is located, so that the self-tapping screw can be more firmly and stably located in the mounting hole, improving the stability and firmness of the self-tapping screw installation.

[0035] Reference Figure 2-5 The reinforcement mechanism also includes multiple second semicircular blocks 15 disposed in the circular hole 8, and each of the multiple second semicircular blocks 15 is provided with the same connecting hole 17, the same connecting post 16 fixedly installed in the connecting hole 17, a positioning plate 7 fixedly installed at one end of the top of the connecting post 16, multiple first semicircular blocks 14 being adapted to the corresponding second semicircular blocks 15, the width of the positioning plate 7 being greater than the width of the circular hole 8, and multiple reinforcing teeth 5 being fixedly installed at the bottom of the pad plate 2.

[0036] In use, the positioning plate 7 is hammered with an external tool. At this time, the connecting column 16 and multiple second semicircular blocks 15 will move downward. The downward movement of the multiple second semicircular blocks 15 will drive the corresponding first semicircular block 14 and multiple reinforcing columns 13 to move as well. By setting the reinforcing teeth 5, the firmness of the connection with the substrate can be strengthened.

[0037] Reference Figure 4-6The positioning mechanism includes two symmetrically arranged slots 10 on the top of the screw head 3, two first wedge blocks 18 slidably installed in the two slots 10, and two second wedge blocks 19 symmetrically fixedly installed on the side of the positioning plate 7 near the slots 10, which are adapted to the corresponding first wedge blocks 18, a limiting groove 20 in the slots 10, a limiting block 21 slidably installed in the limiting groove 20, and the limiting block 21 is fixedly connected to the first wedge block 18. The positioning plate 7 covers the slots 10.

[0038] In use, the positioning plate 7 can be positioned and installed by the cooperation of the second wedge block 19 and the first wedge block 18, thereby preventing the positioning plate 7 from shaking after installation, thus improving the stability and firmness during later use.

[0039] The implementation principle of a self-tapping self-cutting screw in this application embodiment is as follows: When in use, the screw head 3 first cooperates with an external tool through the cross-shaped square groove 6, so that the positioning and installation with the substrate can be completed through the cooperation of the cutting part 4 and the threaded rod 1.

[0040] After the screw is tightened in the mounting hole, the connecting post 16 and multiple second semicircular blocks 15 are placed in the circular hole 8, and the positioning plate 7 is hammered with an external tool. At this time, the connecting post 16 and multiple second semicircular blocks 15 will move downward. The downward movement of the multiple second semicircular blocks 15 will drive the corresponding first semicircular block 14 and multiple reinforcing posts 13 to move as well. The movement of the multiple reinforcing posts 13 will push the corresponding reinforcing cones 12 to move to the outside, so that the multiple reinforcing cones 12 can abut against the mounting hole where the threaded rod 1 is located, so that the self-tapping screw can be more firmly and stably located in the mounting hole, improving the stability and firmness of the self-tapping screw installation.

[0041] The positioning plate 7 can be positioned and installed by the cooperation of the second wedge block 19 and the first wedge block 18, thereby preventing the positioning plate 7 from shaking after installation and improving its stability and firmness during later use.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-tapping self-cutting screw, comprising a threaded shank (1), characterized in that: A pad (2) is fixedly installed at one end of the threaded rod (1), and a screw head (3) is fixedly installed on the top of the pad (2). A cross-shaped square groove (6) is opened on the screw head (3). A cutting part (4) is provided at the tail of the threaded rod (1). A reinforcing mechanism is provided inside the threaded rod (1). A driving mechanism for driving the reinforcing mechanism to install is provided on the screw head (3). The reinforcement mechanism includes a circular hole (8) inside the threaded rod (1), the circular hole (8) extending to the outside of the pad (2) and the screw head (3), a plurality of reinforcing columns (13) are provided in the circular hole (8), a first semicircular block (14) is fixedly installed at one end of each of the plurality of reinforcing columns (13), a plurality of sliding holes (11) corresponding to the reinforcing columns (13) are provided on one side of the outer surface of the threaded rod (1), and a reinforcing cone (12) is fixedly installed at one end of each of the plurality of reinforcing columns (13).

2. The self-tapping self-cutting screw according to claim 1, characterized in that: The lateral length of the first semicircular block (14) is greater than the width of the sliding hole (11), and the circular hole (8) and the sliding hole (11) are connected.

3. The self-tapping self-cutting screw according to claim 1, characterized in that: The driving mechanism includes a plurality of second semicircular blocks (15) disposed in a circular hole (8). Each of the plurality of second semicircular blocks (15) has the same connecting hole (17). The same connecting column (16) is fixedly installed in each connecting hole (17). A positioning plate (7) is fixedly installed at one end of the top of the connecting column (16).

4. A self-tapping self-cutting screw according to claim 3, characterized in that: Each of the first semicircular blocks (14) is adapted to the corresponding second semicircular block (15).

5. A self-tapping self-cutting screw according to claim 3, characterized in that: The width of the positioning plate (7) is greater than the width of the round hole (8), and multiple reinforcing teeth (5) are fixedly installed on the bottom of the pad (2).

6. A self-tapping self-cutting screw according to claim 5, characterized in that: The top of the screw head (3) has two symmetrically opened snap-fit ​​grooves (10), and a first wedge block (18) is slidably installed in each of the two snap-fit ​​grooves (10). The positioning plate (7) has two second wedge blocks (19) that are adapted to the corresponding first wedge blocks (18) symmetrically fixed on the side of the snap-fit ​​groove (10).

7. A self-tapping self-cutting screw according to claim 6, characterized in that: A limiting groove (20) is provided in the snap-fit ​​groove (10), and a limiting block (21) is slidably installed in the limiting groove (20). The limiting block (21) is fixedly connected to the first wedge block (18), and the positioning plate (7) covers the snap-fit ​​groove (10).

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