Cross countersunk head self-drilling and self-tapping screw

Abstract

The utility model discloses a cross countersunk head self-drilling and self-tapping screw, which relates to the technical field of fasteners and comprises a screw main body, a screw head is mounted at the top end of the screw main body, a cross groove is formed in the top end of the screw head, a connecting groove is formed in the top end of the screw main body, and a connecting column is fixedly connected to the bottom end of the screw head. The connecting column is arranged in the connecting groove, the cross section of the connecting column is in a regular polygon shape, a plurality of arc-shaped elastic pieces are evenly arranged in the connecting groove along the circumference, and the ends of the arc-shaped elastic pieces abut against the side face of the connecting column. The arc-shaped elastic piece deforms, so that the connecting column crosses the arc-shaped elastic piece, the slipping phenomenon occurs, and the phenomenon that the screw slips due to overlarge output force is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to fastener technical field, concretely is a cross countersunk head self -drilling self -tapping screw. BACKGROUND

[0002] Self -tapping self -drilling screw often adopts carbon steel, stainless steel, copper, copper alloy etc. material makes, because its high strength corrosion resistance is good, and penetrative force is very strong, often used in various installation occasions, self -drilling self -tapping screw is a commonly used connecting fastener, and it is mostly used between metal plate (such as metal roof panel etc.) or the connection between metal plate and base, purlin etc. structure. Self -drilling self -tapping screw combines the two processes of drilling and tapping once when connecting, it first drills a hole with the drill bit in front of the screw, then taps (including fastening connection) with the thread, saves construction time, improves construction efficiency.

[0003] The installation of the existing screw generally uses an ordinary screwdriver. In some installation processes, the force is not accurately controlled, causing the screw and the connected part to slip, and thus the connection of the connected part is unstable.

[0004] To solve the above problems, we have made improvements and propose a cross countersunk head self-drilling self-tapping screw. CONTENT OF THE UTILITY MODEL

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model provides a cross countersunk head self-drilling self-tapping screw, including screw main part, the top of screw main part is installed with screw head, the top of screw head is equipped with cross groove, the top of screw main part is equipped with connecting groove, the bottom of screw head is fixedly connected with connecting column, and connecting column is arranged in the inside of connecting groove, the cross section shape of connecting column is regular polygon, the inside of connecting groove is evenly provided with a plurality of arc spring sheets along the circumference, and the end of arc spring sheet is in abutment with the side surface of connecting column.

[0007] As a preferred technical scheme of the utility model, the inside of connecting groove is fixedly connected with limiting ring, the bottom of connecting column is fixedly connected with connecting neck, and connecting neck penetrates to the below of limiting ring, the bottom of connecting neck is fixedly connected with limiting block.

[0008] As a preferred technical scheme of the utility model, the bottom of limiting block is evenly provided with a plurality of clamping grooves along the circumference, the inside of clamping groove is provided with clamping block, and clamping block is fixedly connected at the bottom of connecting groove, the cross section shape of clamping groove and clamping block is triangle.

[0009] As a preferred technical scheme of the utility model, the height of connecting neck is slightly higher than the sum of the height of limiting ring and clamping block.

[0010] As a preferred technical scheme of the utility model, the bottom end outer side of the screw head is fixedly connected with a rubber ring, and the rubber ring is attached to the top end of the screw body.

[0011] The utility model has the advantages of:

[0012] 1. After the screw is completely screwed into the connecting piece, the rotating connecting column extrudes the arc-shaped elastic sheet, the arc-shaped elastic sheet is deformed, the connecting column passes over the arc-shaped elastic sheet, and the phenomenon of slipping occurs, thereby avoiding the phenomenon of screw thread slipping caused by excessive force.

[0013] 2. If the screw head and the screw body slip, the screwdriver applies a force to the screw head in the direction of the screw body, the clamping block is embedded in the clamping groove, the screw body is driven to rotate through the cooperation of the clamping groove and the clamping block, and the screw is more convenient to disassemble. DRAWINGS

[0014] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used together with the embodiments of the utility model to explain the utility model, and do not constitute a limitation on the utility model. In the drawings:

[0015] Figure 1 It is the perspective view of the utility model;

[0016] Figure 2 It is the sectional view of the utility model;

[0017] Figure 3 It is the Figure 2 enlarged view of A in the middle of the utility model;

[0018] Figure 4 It is the schematic view of the screw head of the utility model;

[0019] In the drawing: 1, screw body; 2, screw head; 3, cross slot; 4, connecting groove; 5, connecting column; 6, limiting ring; 7, arc-shaped elastic sheet; 8, connecting neck; 9, limiting block; 10, clamping groove; 11, clamping block; 12, rubber ring. DETAILED DESCRIPTION

[0020] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0021] Embodiment: as Figure 1 - Figure 4As shown in the figure, a cross countersunk self-drilling self-tapping screw, comprising a screw body 1, a screw head 2 is installed at the top end of the screw body 1, a cross slot 3 is opened at the top end of the screw head 2, a connecting groove 4 is opened at the top end of the screw body 1, a connecting column 5 is fixedly connected at the bottom end of the screw head 2, and the connecting column 5 is arranged inside the connecting groove 4, the cross section shape of the connecting column 5 is a regular polygon, the number of sides of the regular polygon is an integer multiple of the arc-shaped elastic piece 7, a plurality of arc-shaped elastic pieces 7 are evenly arranged inside the connecting groove 4 along the circumference, and the end of the arc-shaped elastic piece 7 abuts against the side surface of the connecting column 5, and the elastic coefficient of the arc-shaped elastic piece 7 is selected according to the actual situation;

[0022] The screwdriver head is embedded in the cross slot 3, the screwdriver is rotated to drive the screw head 2 to rotate through the cross slot 3, the rotating screw head 2 drives the connecting column 5 to rotate, the rotating connecting column 5 acts on the arc-shaped elastic piece 7, and then the screw body 1 is rotated, and then the screw is rotated into the connecting piece, when the screw is completely sunk into the connecting piece, if the screwdriver is continuously rotated, at this time, the screw body 1 receives the maximum reaction force, and then the rotating connecting column 5 extrudes the arc-shaped elastic piece 7, the arc-shaped elastic piece 7 is deformed, the connecting column 5 passes through the arc-shaped elastic piece 7, and the phenomenon of slipping occurs, and then the phenomenon of screw slipping caused by excessive force is avoided.

[0023] Specifically, as shown in Figure 2 , Figure 3 and Figure 4 , the inside of the connecting groove 4 is fixedly connected with a limiting ring 6, the bottom end of the connecting column 5 is fixedly connected with a connecting neck 8, and the connecting neck 8 penetrates to the lower side of the limiting ring 6, the bottom end of the connecting neck 8 is fixedly connected with a limiting block 9, the limiting block 9 is connected with the connecting column 5 through the connecting neck 8, and then the connecting column 5 is limited by the limiting ring 6, so that the screw body 1 and the screw head 2 are an integral whole.

[0024] Specifically, as shown in Figure 2 , Figure 3 and Figure 4 , the bottom end of the limiting block 9 is evenly provided with a plurality of clamping grooves 10 along the circumference, the inside of the clamping groove 10 is provided with a clamping block 11, and the clamping block 11 is fixedly connected to the bottom end of the connecting groove 4, the cross section shape of the clamping groove 10 and the clamping block 11 is triangular, the height of the connecting neck 8 is slightly higher than the sum of the height of the limiting ring 6 and the height of the clamping block 11, when the screw is disassembled, if the screw head 2 and the screw body 1 slip, a force is applied to the screw head 2 by the screwdriver in the direction of the screw body 1, so that the clamping block 11 is embedded in the clamping groove 10, the screw body 1 is driven to rotate through the cooperation of the clamping groove 10 and the clamping block 11, and the screw is disassembled more conveniently.

[0025] Specifically, as shown in Figure 1 and Figure 4As shown, the bottom end of the screw head 2 is fixedly connected with a rubber ring 12, and the rubber ring 12 is attached to the top end of the screw body 1. In normal state, the clamping block 11 is separated from the clamping groove 10, and the rubber ring 12 is arranged between the screw head 2 and the screw body 1 to play a sealing role.

[0026] Working principle: the screwdriver head is embedded in the cross groove 3, and the screwdriver is rotated to drive the screw head 2 to rotate, the rotating screw head 2 drives the connecting column 5 to rotate, the rotating connecting column 5 acts on the arc spring 7, and then the screw body 1 is rotated, and then the screw is rotated into the connecting piece, when the screw is completely sunk into the connecting piece, if the screwdriver is continuously rotated, at this time, the screw body 1 is subjected to the maximum reaction force, and then the rotating connecting column 5 extrudes the arc spring 7, the arc spring 7 is deformed, the connecting column 5 passes through the arc spring 7, and the phenomenon of slipping occurs, and then the phenomenon of slipping is avoided.

[0027] If the screw head 2 and the screw body 1 slip, a force is applied to the screw head 2 by the screwdriver in the direction of the screw body 1, so that the clamping block 11 is embedded in the clamping groove 10, the screw body 1 is driven to rotate by the cooperation of the clamping groove 10 and the clamping block 11, and the screw is more convenient to disassemble.

[0028] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A cross recessed button head self-drilling and self-tapping screw comprising a screw body (1), characterized in that, The top end of the screw body (1) is provided with a screw head (2), the top end of the screw head (2) is provided with a cross slot (3), the top end of the screw body (1) is provided with a connecting slot (4), the bottom end of the screw head (2) is fixedly connected with a connecting column (5), and the connecting column (5) is arranged in the connecting slot (4).

2. A cross recessed head, self-drilling and self-tapping screw according to claim 1, characterized in that, The inside of the connecting slot (4) is fixedly connected with a limiting ring (6), the bottom end of the connecting column (5) is fixedly connected with a connecting neck (8), and the connecting neck (8) penetrates to the lower side of the limiting ring (6).

3. A cross recessed head, self-drilling and self-tapping screw according to claim 2, characterized in that, The bottom end of the limiting ring (6) is fixedly connected with a limiting block (9).

4. A cross recessed head, self-drilling and self-tapping screw according to claim 2, characterized in that, The bottom end of the limiting block (9) is uniformly provided with a plurality of clamping grooves (10) along the circumference, the inside of the clamping groove (10) is provided with a clamping block (11), and the clamping block (11) is fixedly connected to the bottom end of the connecting slot (4).

5. A cross-flattened countersunk head drill and tap screw according to claim 1 wherein, The height of the connecting neck (8) is higher than the sum of the height of the limiting ring (6) and the height of the clamping block (11). The bottom end of the screw head (2) is fixedly connected with a rubber ring (12), and the rubber ring (12) is attached to the top end of the screw body (1).

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