Anti-cracking self-tapping screw

Abstract

The utility model discloses an anti-cracking self-tapping screw which comprises a screw head part and a screw rod part, the screw head part is located at the end of the screw rod part, an anti-torsion piece is arranged at the joint of the screw head part and the screw rod part, and the joint can be effectively prevented from cracking or breaking due to overlarge torque and uneven stress.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, and more specifically relates to a crack-resistant self-tapping screw. Background Technology

[0002] Large-diameter self-tapping screws are generally used for connecting metal and concrete. Therefore, when rotating a self-tapping screw, the torque on the screw is relatively large. When the threaded part of the self-tapping screw is fully inserted into the self-tapping hole, the torque will be transmitted from the head of the screw to the shank. Since the screw head is usually formed by cold forging, the stress at the connection between the head and the shank is usually uneven. Therefore, when the torque is transmitted to the connection between the two, it is easy to cause cracking or even breakage, affecting the use of the self-tapping screw. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a self-tapping screw with an anti-torsion component, which can effectively prevent the screw from cracking or breaking due to excessive torque or uneven stress.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a crack-resistant self-tapping screw, comprising a screw head and a screw shank, wherein the screw head is located at the end of the screw shank, and an anti-torsion member is provided at the connection between the screw head and the screw shank.

[0005] Furthermore, the anti-torsion member includes a cylindrical portion sleeved on the screw portion and a plate portion located on the lower surface of the screw head. The plate portion is connected to the screw head, and the cylindrical portion is connected to the screw portion. The outer diameter of the cylindrical portion is smaller than the outer diameter of the thread on the screw portion.

[0006] Furthermore, both the cylindrical portion and the plate portion are provided with a number of rivets. The heads of the rivets are riveted to the cylindrical portion and the plate portion, and the rivets extend into the screw head and the screw rod portion. The heads of the rivets are flush with the lower surface of the screw head and the outer surface of the cylindrical portion.

[0007] Furthermore, the plate is provided with anti-slip teeth.

[0008] Compared with the prior art, the beneficial effects of this utility model are: by setting an anti-torsion component at the connection between the screw head and the screw shank of the self-tapping screw, the torsional resistance of the connection is improved. When the screw shank is fully inserted into the self-tapping surface, it can effectively prevent the connection from cracking or breaking due to excessive torque and uneven stress. Attached Figure Description

[0009] Figure 1 This is a structural schematic diagram of the anti-cracking self-tapping screw of this utility model;

[0010] Figure 2 for Figure 1 Enlarged view of section A.

[0011] Reference numerals: 1. Screw head; 2. Screw part; 3. Cylinder part; 4. Plate part; 5. Rivet. Detailed Implementation

[0012] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0013] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0014] Reference Figure 1 and Figure 2 The present invention will be further described below.

[0015] A crack-resistant self-tapping screw includes a screw head 1 and a screw shank 2, wherein the screw head 1 is located at the end of the screw shank 2, and an anti-torsion member is provided at the connection between the screw head 1 and the screw shank 2.

[0016] like Figure 1 As shown, in this preferred embodiment, the anti-torsion component includes a cylindrical portion 3 sleeved on the screw portion 2 and a plate portion 4 located on the lower surface of the screw head 1. The plate portion 4 is connected to the screw head 1, and the cylindrical portion 3 is connected to the screw portion 2. The outer diameter of the cylindrical portion 3 is smaller than the outer diameter of the thread on the screw portion 2.

[0017] like Figure 1 As shown in the preferred embodiment, both the cylindrical part 3 and the plate part 4 are provided with a plurality of rivets 5. The heads of the rivets 5 are riveted to the cylindrical part 3 and the plate part 4, and the rivets 5 extend into the screw head 1 and the screw shank 2. The heads of the rivets 5 are flush with the lower surface of the screw head 1 and the outer surface of the cylindrical part 3.

[0018] In this preferred embodiment, the plate portion 4 is provided with anti-slip teeth.

[0019] like Figure 1and Figure 2 As shown, by setting an anti-torsion component at the connection between the screw head 1 and the screw shank 2 of the self-tapping screw, the torsional resistance of the connection is improved. When the screw shank 2 is fully inserted into the self-tapping surface, it can effectively prevent the connection from cracking or breaking due to excessive torque and uneven stress.

[0020] Specifically, the anti-torsion component can also be a number of reinforcing ribs connected to the lower surface of the screw head 1 and the screw shank 2, and can also be connected by welding.

[0021] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A crack-resistant self-tapping screw, comprising a screw head and a shank, wherein the screw head is located at the end of the shank, characterized in that: An anti-torsion component is provided at the connection between the screw head and the screw rod. The anti-torsion component includes a cylindrical portion sleeved on the screw portion and a plate portion located on the lower surface of the screw head. The plate portion is connected to the screw head, and the cylindrical portion is connected to the screw portion. The outer diameter of the cylindrical portion is smaller than the outer diameter of the thread on the screw portion.

2. The anti-cracking self-tapping screw according to claim 1, characterized in that: Both the cylindrical part and the plate part are provided with a number of rivets. The head of the rivet is riveted to the cylindrical part and the plate part, and the rivet extends into the screw head and the screw rod part. The head of the rivet is flush with the lower surface of the screw head and the outer surface of the cylindrical part.

3. The anti-cracking self-tapping screw according to claim 1, characterized in that: The plate is provided with anti-slip teeth.

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