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Self-boring screw

A self-drilling and screw technology, applied in the direction of screws, pins, threaded fasteners, etc., can solve problems such as drilling screw drilling defects

Inactive Publication Date: 2013-10-23
SFS INTEC HLDG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn can lead to drilling defects for the self-drilling screw

Method used

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  • Self-boring screw
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Examples

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Embodiment Construction

[0019] In describing the invention in more detail is shown in Figure 1-6 Before proceeding to the various embodiments in FIG. 7 , it is useful to briefly consider the prior art shown in FIG. 7 . In Figure 7 is used with the Figure 1-6 The same markup in , but increased by 100 respectively. A self-drilling screw, generally designated 102 , is shown, which has a threaded shank 104 . The screw shank 104 terminates in a tip 105 having an unthreaded cylindrical portion 105a and a likewise unthreaded conical portion 105b. The thread of the screw shank 104 is a self-cutting thread. At the free end of the screw shaft 104 there is an opening (not shown in FIG. 7 ) which extends to the tip 105 and into which a drill part 106 embodied in the form of a plate is inserted. Due to the corresponding cross-sectional shape of the insertion end of the drill bit 106 and due to the deformation 103 at the tip 105 of the screw shaft 104 , there is a positive connection between the drill bit 10...

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PUM

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Abstract

A self-boring screw (2) having a boring section (6) attached to the free end of the screw shaft (4), two vanes (12) radially protruding from the boring section, the edges of the vanes facing toward the boring tip (8) of the boring section (6) being configured as boring blades (13). The boring section (6) includes a chip discharge zone (14) that is configured such that the edges of the vanes (12) facing toward the boring tip (8) forms a cutting point (S) with a boring radius (16), the cutting point having a distance (A) to the screw shaft (4) that is at least ⅔ of the cutting edge length of the bore tip (8). The chip discharge zone (14) makes it possible that the chips produced by the boring blade (10) at the boring tip (8) can be discharged freely and without buildup. The material cut by the boring blade (10) is conveyed as chipped material away from the boring tip (8) in the direction of the cutting point (S) at a lower vane connection (15) as a result of the rotational motion of the screw (2), thus ensuring unhindered chip discharge. It is possible to compress the chips to be discharged to a maximum of ⅔ of the cross section occurring after the cut. This ensures that even critically sized chips are removed without blocking the discharge of chips from the area of the boring section (6).

Description

technical field [0001] The invention relates to a self-drilling screw comprising a threaded shank and a drill member mounted on the free end of the shank, the drill member having a drill tip comprising an obtuse-angled drill edge and a drill radius , for producing a core hole for the thread of the screw shank, wherein the drill piece has, at an axial distance from the drill tip, one or more fins or vanes freely protruding transversely to the screw axis, which border the drill tip Formed as a drill edge, in order to enlarge the core hole produced by the drill edge of the drill tip, at least so that the thread provided on the screw shank is free in a drill hole produced by the wing, so that between the thread and the drill hole An additional free space is reserved between the tip of the screw shank, where the part adjacent to the drill part is formed as a truncated cone, and the drill part is formed between the fins or fins and the part of the tip that is formed as a truncated c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B25/10
CPCF16B25/0084F16B25/103F16B13/003F16B25/0089F16B25/0031
Inventor R·迈尔
Owner SFS INTEC HLDG AG