Importance

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Abstract

A drive formation for a rotary drive, for example a depression in the end face of a screw, has two regions with different cross-sections, but with a cross-sectional form having a certain similarity, arranged axially in succession. Due to the smaller cross section with a similar cross-sectional form, the transfer of torque can be better adapted to the form of a counter-sunk head of a countersunk head screw. The cross-sectional form corresponds to a central circular core with wing-like attachments attached thereto and protruding radially beyond the outer face of the core. The wings have side walls extending approximately parallel to one another in cross section, and therefore the wings have at least approximately the same thickness as far as their end forming an end wall. Said wings also have the same thickness when viewed over the depth of the formation, and therefore no forces causing the tool to be pushed out are produced.

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First Claim