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screw drive mechanism

A driving mechanism and screw technology, applied in screwdrivers, screws, bolts, etc., can solve problems such as screw driving mechanism and thread obstruction, screw non-fitting, screw driving process damage, etc.

Inactive Publication Date: 2018-08-21
EJOT GMBH & CO KB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Previously known screw drive mechanisms have the disadvantage that although the design of their cams generally ensures good transfer of rotation and provides high wear resistance, the screw will not conform to the driven tool, even temporarily
[0009] Current state-of-the-art screw drive mechanisms and threads will be locally hindered by layers accumulating up to 200μm, for which reason they can no longer adequately fulfill their function and / or meet their specifications
In order to prevent this layer accumulation from causing damage to the screw driving process, this prior art surface is not used for small and micro small screws

Method used

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Experimental program
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Embodiment Construction

[0058] Such as figure 1 As shown, the screw 10 of the present invention has a screw head with a drive mechanism 12 . The screw drive mechanism 12 comprises cams 14a, 14b, 14c for torque transmission. The cams 14a, 14b, 14c are formed by recesses made in the screw heads around the intended cams 14a, 14b, 14c. The cams 14a, 14b, 14c have side surfaces 18a, 18b and an end surface 16 connecting the side surfaces 18a, 18b. The torque is transmitted tangentially to the sides 18a, 18b by the corresponding tool. Below, refer to figure 2 , the essential features of the drive mechanism 12 will be explained in more detail.

[0059] figure 2 is a perspective view of a drive mechanism 12 with three cams 14a, 14b, 14c according to the invention. According to the invention, the end faces 16a, 16b, 16c are designed such that the end facing away from the screw head has the necessary concave profile. According to the invention, the end faces 16a, 16b, 16c are designed such that they ha...

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PUM

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Abstract

The invention relates to a screw with a screw head having a drive mechanism comprising cams formed by recesses introduced into the screw head around the cam, each cam having two sides for transmitting rotation and The end face of the connection side has a concave profile at the end of the screw head facing away from the screw shank. The invention is characterized in that the end face is designed such that an imaginary circular edge surrounding the screw axis in a plane perpendicular to the screw axis and having a radius relative to this plane has a contact point with the end face at the cam. Over at least part of the axial height of the end face, a contact area is formed, ie a plurality of contact points forming a contact line in the center of the end face.

Description

technical field [0001] The invention relates to a screw with a screw head with a drive mechanism as claimed in the preamble of claim 1 and to a corresponding drive tool as claimed in claim 9 and to a corresponding driving tool as claimed in claim 18 drive system including screw and drive tool as described. Background technique [0002] Screws of the type disclosed eg in German patent DE19923855 have a screw head comprising a drive mechanism. The design of the drive mechanism usually has a recess formed in the screw head, the shape of which recess is such that a cam is formed in the edge region, which cam has sides for transmitting the rotation. A recess extends between the cams in such a way that a tool can be applied to the cams, which tool will drive the screw when turned. US Patent No. 5279190 also discloses a universal screw of this type and a matching drive tool of cylindrical basic design. [0003] Previously known screw drive mechanisms have the disadvantage that a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B15/00
CPCB25B15/005B25B23/108F16B23/003B25B15/004
Inventor 尼尔斯·兰茨曼
Owner EJOT GMBH & CO KB