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Tapping screw

A technology of self-tapping screws and thread teeth, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of increased processing operations, increased costs, and complex molds, and achieve the effect of sufficient fastening force

Active Publication Date: 2015-03-11
TOPURA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary self-tapping screws may not be able to properly fasten thin steel plates with a thickness of less than 1mm.
[0007] The increase in the number of parts in the fastening method using bolts and nuts, and the increase in processing operations in the method of performing burring, and the complexity of the die are both causes of cost increases.
In addition, in the burring process of the thin plate, there is also a problem that the height of the rimming cannot be ensured sufficiently.

Method used

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  • Tapping screw
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] Hereinafter, referring drawings, based on an Example, the form for carrying out this invention is demonstrated in detail as an example. However, unless otherwise specified, the scope of the present invention is not limited to the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment.

[0058] (Example)

[0059]refer to Figure 1 to Figure 10 , the self-tapping screw of the embodiment of the present invention will be described.

[0060]

[0061] In particular, refer to figure 1 with figure 2 , the structure of the self-tapping screw of the embodiment of the present invention will be described. A self-tapping screw 100 according to the present embodiment includes a shaft portion 10 and a head portion 20 . Two screw threads are formed on the shaft portion 10 . The tooth height and tooth shape of these two thread teeth are the same. For convenience of description, these two thread threads are called a first thre...

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PUM

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Abstract

Provided is a tapping screw that provides sufficient fastening force even if used with a thin screw-receiving member and member being fastened. Said tapping screw (100) is provided with a first thread (11) and a second thread (12) designed such that the ends thereof are 180° out of phase. The tapping screw (100) is screwed into a pilot hole provided in advance in a screw-receiving member. A member being fastened is thereby fastened to said screw-receiving member. This tapping screw (100) is characterized in that a first fastening-force improvement thread (13) and a second fastening-force improvement thread (14) that are set so as to be smaller than the outside diameters of complete thread sections of parallel thread sections of the first thread (11) and the second thread (12) but larger than the inside diameter of the pilot hole are provided in regions, 90° out of phase with the first thread (11) and the second thread (12), respectively, such that said fastening-force improvement threads bite into the pilot hole when the screw is fully screwed in.

Description

technical field [0001] The present invention relates to a self-tapping screw that can be favorably used for thin steel plates. Background technique [0002] General self-tapping screws may not be able to properly fasten thin steel plates with a plate thickness of less than 1 mm. For the reason, refer to Figure 11 to Figure 15 Be explained. Figure 11 It is a front view of the self-tapping screw related to the conventional example. Figure 12 yes Figure 11 CC section view in . Figure 13 ~ Figure 15 It is a figure which shows the situation at the time of fastening the self-tapping screw of a conventional example. [0003] The self-tapping screw 500 is composed of a shaft portion 510 and a head portion 520 on which threads are formed. Usually, there is one thread thread formed on the shaft portion 510 of the self-tapping screw 500, such as Figure 12 As shown in the cross-sectional view of , the cross-sectional shape is a non-circular cross-section obtained by combinin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B25/04F16B25/10
CPCF16B25/0021F16B25/0084F16B25/0068F16B35/04
Inventor 堀内直树
Owner TOPURA CO LTD