Self-tapping screw with sawtooth threads

A self-tapping screw and sawtooth thread technology, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of screw breakage, delayed breakage, and high driving torque requirements, so as to improve work efficiency and increase cutting function , The effect of improving the connection force

Inactive Publication Date: 2015-04-22
WUXI YUXING BUILDING HARDWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is forced to screw in very reluctantly, the driving torque is required to be large, and the possible adverse result is that the screw will break or delay breaking in the fixed material, which will cause an accident.

Method used

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  • Self-tapping screw with sawtooth threads
  • Self-tapping screw with sawtooth threads
  • Self-tapping screw with sawtooth threads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Such as Figure 1-5 As shown, the thread is provided with sawtooth 3, and the tooth shape includes full sawtooth, upper half sawtooth, lower half sawtooth, oblique sawtooth, and straight sawtooth of the thread.

[0025] image 3 , 4 , 5 is a self-tapping screw with sawtooth threads of the present invention, the threaded area 2 of the screw rod 1 is extended to reduce the outer diameter, and the end of the screw rod is a transitional threaded area, which is to reduce the outer diameter and extend the frustum or conical shape , the thread in the transition thread area is provided with at least 2-4 turns of thread or all threads are serrated threads. There are 5, 7, and 9 teeth on each turn of the thread in the transitional thread area, and the teeth are oblique or straight, and the thread tail can have two forms: flat tail or pointed tail.

[0026] The thread in the transitional thread zone will have 5 to 9 turns, which is the most common. The thread in the transition...

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PUM

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Abstract

Disclosed is a self-tapping screw with sawtooth threads. The end of a screw rod is a transition threaded area and is in the shape that the outer diameter is reduced and a circular truncated cone or a cone is extended. At least two to five circles or all of threads on the rod body or transition threaded area of the screw rod are sawtooth threads. The self-tapping screw can be easily screwed into an aluminum plate with the thickness of 4 mm and 1 mm, and tapping does not need to be carried out in advance, which the national-standard self-tapping screw pitch cannot easily complete.

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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IPC IPC(8): F16B25/00
CPCF16B25/0042
Inventor 徐旭徐娇娇徐妙妙
Owner WUXI YUXING BUILDING HARDWARE
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