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Screw

A screw and thread technology, applied in the field of screws, can solve the problems of large notch stress concentration effect, head disconnection, etc., and achieve the effect of optimizing resistance and reducing the effect of notch stress concentration

Inactive Publication Date: 2009-09-09
HILTI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage here is that when such a screw is screwed in, large loads due to force deflection are associated with large diameter steps between the head and the shank, which loads lead to The transition zone between the parts produces a large notch stress concentration effect
Then on this type of screw there is a risk of breaking the head from the shank

Method used

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Examples

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Embodiment Construction

[0011] The threaded screw 10 according to the invention shown in the figure has a shank 11 with a thread 15, at one end of which a center 13 is arranged, and at the opposite end of the shank. A head 14 is provided at one end. An axis A here defines the axial direction of the screw 10 . The head 14 has a rotary driver 17 for a screw tool, which is designed as an outer polygon and in particular an outer hexagon, onto which a screwdriver can be slipped.

[0012] Between the head 14 and the shank 11 there is provided a transition zone 12 which is reinforced with respect to the shank 11 by a geometry which surrounds three truncated cones 21 , 22 which adjoin each other in the axial direction ,twenty three.

[0013] The generatrix of the first truncated cone 21 closest to the head 14 has an inclination α between 40° and 50° relative to the axis A, and is preferably 45° (for clarity, it is drawn relative to The inclination α) of the projection line 16 of the shank 11 running paral...

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Abstract

The invention relates to a screw to form threads, which is provided with a rod 11 which is provided with threads at least on part of the structure and determines an axial line. A transition region (12) is located between the screw head and the screw stem and having its circumference formed of from three to ten truncated cones (21, 22, 23) following each other in an axial direction and surface lines of which have different inclination angles (alpha, beta, gamma) toward the axis (A) which diminish from the head (14) in direction of the tip (13), with a first inclination angle (alpha) of the surface line of a truncated cone (21) located closest to the head (14) amounting to from 40 DEG to 50 DEG.

Description

technical field [0001] The invention relates to a screw of the type specified in the preamble of claim 1 . Screws of this type are designed, for example, as threaded screws and are used, for example, for screwing metal sheets. Background technique [0002] Screws of this type usually have a head with a diameter significantly larger than the diameter of the shank. This is the case, for example, with screws that have a polygonal geometry around the head for follow-up rotation by a screwdriver or a ratchet tool (Nuss). Associated with a large step in the diameter between the head and the shank is that when such a screw is screwed in, large loads are generated due to force deflection, which lead to a gap between the shank and the head. The transition zone produces a large notch stress concentration effect. There is thus a greater risk of breaking the head from the shank on screws of this type. [0003] Known from US 3 661 046 is a screw of this type which has a head with a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B25/00F16B35/00
CPCF16B25/00F16B25/0021F16B35/048
Inventor S·陶P·赫特莱因S·马蒂森M·基贝尔T·基斯特勒
Owner HILTI AG