Tapping screw

A self-tapping screw and screw technology, which is applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of poor effect and insufficient fastening force, and achieve good effect, small screwing resistance and good effect

Inactive Publication Date: 2014-10-15
WUXI YUXING BUILDING HARDWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Generally, the end (tip) of the self-tapping screw is extended by reducing the outer diameter, but in the processing of thin profiles such as aluminum alloys, the pitch of the self-tapping screw of the prior art and the screw diameter ratio are 1:2.5-4; The effect of fixing aluminum alloy thin profiles of about 1mm is not good. Relatively speaking, the pitch of self-tapping screws is too wide. If self-tapping screws with small diameters are used, the fastening force is not enough.

Method used

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Embodiment Construction

[0016] Relatively speaking, the pitch of existing self-tapping screws is too wide, and if a small-diameter self-tapping screw is used, the fastening force is not enough.

[0017] A self-tapping screw of the present invention, the tip 2 of the screw 1 is extended to reduce the outer diameter, the pitch of the screw thread and the diameter ratio of the middle screw 3 are 1:5.5-9; the tip of the screw is a circular frustum or a conical part. The ratio of the pitch of the screw thread to the diameter of the intermediate screw is especially 1:6-8.

[0018] The cross-section of the tip thread teeth of the screw rod is a bald thread 4 with 2-5 threads, and the thread teeth of the middle screw rod are cutting teeth 5 with 3-7 threads. The cross-section of the tip thread teeth is from bald teeth to the cutting teeth of the middle screw rod. The transition thread with the width of the bald tooth gradually narrows. The transition thread is 2-20, especially 2-8 ( figure 2 Also shown in ...

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Abstract

The invention relates to a tapping screw, wherein the tip of a screw rod extends with reduced outer diameter; the tapping screw is characterized in that the diameter ratio of the screw pitch of screw thread to a middle screw rod is 1: (4.1-9); the tip of the screw rod is in a circular truncated cone or circular cone shape. The longitudinal section of thread teeth at the tip of the screw rod are bared teeth; thread teeth of the middle screw rod are cut teeth. The tapping screw can be easily screwed into an aluminium plate with the thickness of 4mm or 1mm, tapping is not needed to be firstly carried out, which is difficult to complete by the national standard tapping screw tooth pitch.

Description

1. Technical field [0001] The present invention provides a self-tapping screw that can effectively prevent loosening, especially for thin aluminum alloy and other material workpieces. 2. Background technology [0002] Self-tapping screws are used for the installation of structural parts, with high efficiency and good fixing effect. For example, CN03152296.3 relates to a self-tapping screw whose thread has a cylindrical outer diameter in the rear area (facing the head), and in the front The threads of the area (away from the head) extend with a decreasing outer diameter towards the tip of the screw. The bisector of the engagement angle measured at the crest of the thread is positioned obliquely with respect to the axial direction of the core and is reversed from the rear region (first section) towards the front region (second section), where the bisector Inclined towards the screw head; the reverse point of the thread cross section should be placed in such a way that the fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B25/02
Inventor 徐旭徐娇娇徐妙妙
Owner WUXI YUXING BUILDING HARDWARE
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