Patent ID: 6951158
Filing Date: 2005-10-04
Classification: B25B,F16B

Abstract:
1. System comprising a screw and a tool therefore, in which the screw has a screw head with a top surface and a slot, the slot having a first recess adjoining the top surface, the slot having an approximately straight-walled cross section, and the tool is provided with an engagement section that is complementary to the first recess, and where the slot has a second recess at a bottom of the first recess, with a smaller diameter than that of the first recess, and the tool is provided with a central point that complements the second recess, the first recess is shaped as a hexalobular star with six points viewed in an axial direction of the screw, the second recess has a circular cross section, and the central point of the tool has a circular cross section, wherein the screw comprises a transition surface between the first and second recesses, which extends to the second recess at a first angle, and the tool comprises a surface between the engagement section and the central point, which extends to the central point at a second angle, the first angle being steeper than the second angle, so that a space is formed between the transition surface and the surface when the tool is inserted into the slot, the space diverging towards the central point.