Self drilling screw

Abstract

The utility model discloses a self drilling screw, which relates to the technical field of screws, and comprises a screw head, the bottom of the screw head is fixedly connected with a screw rod, the bottom of the screw rod is fixedly connected with a drill bit, the screw head is internally provided with a slot matched with a pressing plate for use, and the inside of the screw head is rotatably connected with a plurality of groups of clamping structures matched with the pressing plate for use. Pressure is applied to the screwdriver, the screwdriver head extrudes the pressing plate, the pressing plate can move downwards through mutual matching between the open groove in the bottom of the pressing plate and the spring, the screwdriver with the size unified with that of the clamping groove does not need to be used, and if the size of the screwdriver head is smaller than that of the clamping groove in the self drilling screw, the pressing plate can be moved downwards. Meanwhile, when the self drilling screw is repeatedly used or the using condition is poor, the clamping groove in the screw can deform, the self drilling screw is not prone to slipping when the self drilling screw is assembled or disassembled through the screwdriver, and the practicability and flexibility of the whole self drilling screw are improved.

Description

Technical Field

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

[0002] Self-drilling screws, also known as self-tapping screws or swan neck screws, are fasteners with special functions. Self-drilling screws are screws with a self-tapping drill head at the front end. Using the physical and mathematical principles of the circular rotation of the inclined plane of an object and friction, they are tools for gradually fastening machine parts. They directly drill holes, tap threads, and lock on the material surface through self-tapping threads, without auxiliary processing, greatly saving construction time.

[0003] The tail of the self-drilling screw is in the shape of a drill tail or a pointed tail, with self-tapping ability. It can directly drill holes, tap threads, and lock on the set material. Compared with ordinary screws, the self-drilling screw has higher toughness pulling force and maintaining force, and will not loosen after being combined for a long time.

[0004] It is generally used for fixing color steel tiles of steel structures, and can also be used for fixing thin plates of simple buildings. It is also widely used in fields such as construction, furniture manufacturing, woodworking, and metal processing, such as fixing on dry materials such as gypsum boards and drywalls, as well as furniture manufacturing and wooden floor installation.

[0005] However, the size of the card slot inside the existing self-drilling screw is uniform. When installing or disassembling the self-drilling screw, a screwdriver with the same size as the card slot needs to be used. If the size of the screwdriver bit is smaller than the size of the card slot inside the self-drilling screw, the screwdriver cannot turn the screw. At the same time, when the self-drilling screw is repeated or used under poor conditions, the card slot inside the screw will deform, and it is easy to slip when using a screwdriver to install or disassemble it, making it more inconvenient to use. Content of the Utility Model

[0006] Based on this, the purpose of the present utility model is to provide a self-drilling screw to solve the technical problem that the size of the card slot inside the existing self-drilling screw is uniform. When installing or disassembling the self-drilling screw, a screwdriver with the same size as the card slot needs to be used. If the size of the screwdriver bit is smaller than the size of the card slot inside the self-drilling screw, the screwdriver cannot turn the screw. At the same time, when the self-drilling screw is repeated or used under poor conditions, the card slot inside the screw will deform, and it is easy to slip when using a screwdriver to install or disassemble it, making it more inconvenient to use.

[0007] To achieve the above object, the present utility model provides the following technical solution: A self-drilling screw includes a screw head, a screw rod is fixedly connected to the bottom of the screw head, a drill bit is fixedly connected to the bottom of the screw rod, a plurality of groups of card slots are opened in the screw head, a pressing plate is movably connected in the screw head, a spring is fixedly connected to the bottom of the pressing plate, a slot is opened in the screw head for cooperating with the pressing plate, and a plurality of groups of clamping structures for cooperating with the pressing plate are rotatably connected inside the screw head.

[0008] By adopting the above technical solution, during use, by inserting the screwdriver bit into the card slot in the screw head and applying pressure to the screwdriver, the screwdriver bit squeezes the pressing plate. Through the mutual cooperation between the slot at the bottom of the pressing plate and the spring, the pressing plate can move downward. Through the mutual cooperation between the pressing plate and the clamping structure, when the pressing plate is squeezed, the clamping structure can clamp and fix the screwdriver body. With this structure, it is convenient to solve the technical problem that the size of the card slot in the current self-drilling screw is unified. When installing or disassembling the self-drilling screw, a screwdriver with the same size as the card slot needs to be used. If the size of the screwdriver bit is smaller than the size of the card slot in the self-drilling screw, the screwdriver cannot turn the screw. At the same time, when the self-drilling screw is repeatedly used or under poor usage conditions, the card slot in the screw will deform, and it is easy to slip when using a screwdriver to install or disassemble it, making it inconvenient to use, thus improving the practicability and flexibility of the entire self-drilling screw.

[0009] The present utility model is further configured such that the clamping structure includes a connecting rod, a clamping block, a convex block, and a rotating shaft. The clamping block and the convex block are respectively fixed at both ends of the connecting rod, and the connecting rod is rotatably connected to the screw head through the rotating shaft, and the convex block is located below the pressing plate.

[0010] By adopting the above technical solution, when the screwdriver is inserted into the screw head, it has an effect of squeezing the pressing plate, and then the pressing plate moves downward. Since the convex block is located below the pressing plate, when the pressing plate moves downward, it will squeeze the convex block. Through the mutual cooperation between the rotating shaft and the connecting rod, the ends of the connecting rod can move inward simultaneously, so that the clamping block tightly clamps the outside of the screwdriver.

[0011] The present utility model is further configured such that a plurality of groups of moving slots for cooperating with the connecting rod are opened on the inner side of the screw head, and a coil spring is provided between the moving slot and the rotating shaft.

[0012] By adopting the above technical solution, the provided moving slot enables the connecting rod to move flexibly in the screw head to clamp the screwdriver, and the coil spring between the moving slot and the rotating shaft is beneficial for the connecting rod to drive the convex block and the clamping block to quickly reset when the screwdriver leaves the card slot.

[0013] The present utility model is further configured such that the outer side of the screw head is an octagonal structure, and a limiting ring is fixedly connected to the bottom of the screw head.

[0014] By adopting the above technical solution, when the outer side of the screw head is an octagonal structure, it can better cooperate with a wrench for use, increase the friction between the screw body and the wrench, enable the screw body to withstand a greater torque, and improve the stability of the connection.

[0015] The present utility model is further configured such that a sealing ring is provided between the screw head and the screw rod, and a groove for cooperating with the sealing ring is formed in the limiting ring.

[0016] By adopting the above technical solution, the provided groove is beneficial for limiting and fixing the sealing ring. The sealing ring can increase the friction between the screw body and the structure, thereby enhancing the stability of the connection and preventing the screw from loosening.

[0017] The present utility model is further configured such that the sealing ring is made of rubber material, a threaded structure is provided on the outer side of the screw rod, and a convex thread for cooperating with the threaded structure is provided on the outer side of the drill bit.

[0018] By adopting the above technical solution, when the sealing ring is made of rubber material, due to the good elasticity and deformation ability of rubber itself, it can adapt to different usage occasions of the screw body, improve the sealing effect of the sealing ring, and the convex threads on the outer sides of the screw rod and the drill bit are beneficial for the flexible use of the screw body.

[0019] The present utility model is further configured such that a rubber pad is provided on the outer surface of the clamping block, and the clamping block, the connecting rod and the convex block are all made of stainless steel material.

[0020] By adopting the above technical solution, the rubber pad provided on the outer surface of the clamping block is beneficial for increasing the friction between the clamping block and the screwdriver, enabling the clamping block to tightly clamp the screwdriver. When the clamping block, the connecting rod and the convex block are made of stainless steel material, it is beneficial for increasing their corrosion resistance and wear resistance, and extending the service life of this self-drilling screw.

[0021] In summary, the present utility model mainly has the following beneficial effects:

[0022] 1. By applying pressure to the screwdriver, the tip of the screwdriver squeezes the pressure plate. Through the mutual cooperation between the slot at the bottom of the pressure plate and the spring, the pressure plate can move downward. There is no need to use a screwdriver with the same size as the card slot. If the size of the screwdriver tip is smaller than the size of the inner card slot of the self-tapping screw, the screwdriver can still turn the screw. At the same time, when the self-tapping screw is repeated or used under poor conditions, the card slot inside the screw will deform. When using a screwdriver to install or remove it, it is not easy to slip, improving the practicability and flexibility of the entire self-tapping screw.

[0023] 2. When the screwdriver is inserted into the screw head, it has an effect of squeezing the pressure plate, and then the pressure plate moves downward. The convex block is located below the pressure plate. When the pressure plate moves downward, it will squeeze the convex block. Through the mutual cooperation between the rotating shaft and the connecting rod, the ends of the connecting rod can move closer to each other simultaneously, so that the clamping block tightly clamps the outside of the screwdriver. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0025] Figure 2 is a schematic diagram of the disassembled structure of the present utility model from the first perspective;

[0026] Figure 3 is a schematic diagram of the disassembled structure of the present utility model from the second perspective;

[0027] Figure 4 is a schematic diagram of the sectional structure of the present utility model from the first perspective;

[0028] Figure 5 is a schematic diagram of the sectional structure of the present utility model from the second perspective;

[0029] Figure 6 is the Figure 5 partial enlarged view of A in the present utility model.

[0030] In the figure: 1, screw head; 2, limit ring; 3, screw rod; 4, drill bit; 5, card slot; 6, clamping block; 7, connecting rod; 8, pressure plate; 9, movable slot; 10, sealing ring; 11, rotating shaft; 12, groove; 13, convex block; 14, spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0032] The following will describe the embodiments according to the overall structure of the present utility model.

[0033] A self-drilling screw, as Figures 1-6 shown, includes a screw head 1, a screw rod 3 is fixedly connected to the bottom of the screw head 1, a drill bit 4 is fixedly connected to the bottom of the screw rod 3, multiple groups of card slots 5 are opened in the screw head 1, a pressing plate 8 is movably connected in the screw head 1, a spring 14 is fixedly connected to the bottom of the pressing plate 8, a slot is opened in the screw head 1 for the pressing plate 8 to cooperate with, and multiple groups of clamping structures for the pressing plate 8 to cooperate with are rotatably connected inside the screw head 1.

[0034] During use, by inserting the screwdriver bit into the card slot 5 in the screw head 1 and applying pressure to the screwdriver, the screwdriver bit squeezes the pressing plate 8. Through the mutual cooperation between the slot at the bottom of the pressing plate 8 and the spring 14, the pressing plate 8 can move downward. Through the mutual cooperation between the pressing plate 8 and the clamping structure, when the pressing plate 8 is squeezed, the clamping structure can clamp and fix the screwdriver body. With this structure, it is convenient to solve the technical problem that the size of the card slot 5 in the current self-drilling screw is unified. When installing or disassembling the self-drilling screw, a screwdriver with the same size as the card slot 5 needs to be used. If the size of the screwdriver bit is smaller than the size of the card slot 5 in the self-drilling screw, the screwdriver cannot turn the screw. At the same time, when the self-drilling screw is repeatedly used or under poor working conditions, the card slot 5 in the screw will deform, and it is easy to slip when using a screwdriver to install or disassemble it, making it inconvenient to use. The practicability and flexibility of the entire self-drilling screw are improved.

[0035] Furthermore, when the screwdriver is inserted into the screw head 1, it has an extrusion effect on the pressing plate 8, and then the pressing plate 8 moves downward. The convex block 13 is located below the pressing plate 8. When the pressing plate 8 moves downward, it will squeeze the convex block 13. Through the mutual cooperation between the rotating shaft 11 and the connecting rod 7, the ends of the connecting rod 7 can be simultaneously moved closer inward, so that the clamping block 6 tightly clamps the outside of the screwdriver. The arranged movable slot 9 enables the connecting rod 7 to flexibly move inside the screw head 1 to clamp the screwdriver. And through the coil spring between the movable slot 9 and the rotating shaft 11, it is beneficial for the connecting rod 7 to drive the convex block 13 and the clamping block 6 to quickly reset when the screwdriver leaves the card slot 5.

[0036] In this embodiment, when the outer side of the screw head 1 is an octagonal structure, it can better cooperate with a wrench for use, increase the friction between the screw body and the wrench, enable the screw body to withstand a greater torque, and improve the stability of the connection. The provided groove 12 is beneficial for limiting and fixing the sealing ring 10. Through the sealing ring 10, the friction between the screw body and the structure can be increased, thereby enhancing the stability of the connection and preventing the screw from loosening. The provided limiting ring 2 can better cooperate with the screw head 1 to squeeze the sealing ring 10. When the sealing ring 10 is made of rubber, due to the good elasticity and deformation ability of the rubber itself, it can adapt to different occasions where the screw body is applicable, improving the sealing effect of the sealing ring 10. Moreover, the convex threads on the outer sides of the screw rod 3 and the drill bit 4 are beneficial for the flexible use of the screw body. Finally, the rubber pad provided on the outer surface of the clamping block 6 is beneficial for increasing the friction between the clamping block 6 and the screwdriver, enabling the clamping block 6 to tightly clamp the screwdriver. When the clamping block 6, the connecting rod 7, and the convex block 13 are made of stainless steel, it is beneficial for increasing their corrosion resistance and wear resistance, extending the service life of this self-drilling screw.

[0037] Although the embodiments of the present invention have been shown and described, this specific embodiment is only an interpretation of the present invention and not a limitation thereof. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A self-drilling screw, comprising a screw head (1), characterized in that: The bottom of the screw head (1) is fixedly connected to a screw rod (3), the bottom of the screw rod (3) is fixedly connected to a drill bit (4), a plurality of groups of slots (5) are provided in the screw head (1), a pressure plate (8) is movably connected in the screw head (1), a spring (14) is fixedly connected at the bottom of the pressure plate (8), a slot for cooperating with the pressure plate (8) is provided in the screw head (1), and a plurality of groups of clamping structures for cooperating with the pressure plate (8) are rotatably connected inside the screw head (1).

2. The self-drilling screw according to claim 1, characterized in that: The clamping structure comprises a connecting rod (7), a clamping block (6), a protrusion (13), and a rotating shaft (11); the clamping block (6) and the protrusion (13) are respectively fixed to two ends of the connecting rod (7); the connecting rod (7) is rotatably connected to the screw head (1) via the rotating shaft (11); and the protrusion (13) is located below the pressure plate (8).

3. The self-drilling screw according to claim 2, characterized in that: The inner side of the screw head (1) is provided with a plurality of groups of movable grooves (9) for use with the connecting rod (7), and a coil spring is arranged between the movable groove (9) and the rotating shaft (11).

4. The self-drilling screw according to claim 1, characterized in that: The outer side of the screw head (1) is an octagonal structure, and the bottom of the screw head (1) is fixedly connected to a limiting ring (2).

5. The self-drilling screw according to claim 4, characterized in that: A sealing ring (10) is arranged between the screw head (1) and the screw rod (3), and a groove (12) for cooperating with the sealing ring (10) is provided in the limiting ring (2).

6. The self-drilling screw according to claim 5, characterized in that: The sealing ring (10) is made of rubber material, a thread structure is arranged on the outside of the screw rod (3), and a convex pattern used in conjunction with the thread structure is arranged on the outside of the drill bit (4).

7. The self-drilling screw according to claim 2, characterized in that: The outer surface of the clamping block (6) is provided with a rubber pad, and the clamping block (6), the connecting rod (7) and the protrusion (13) are all made of stainless steel.

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