Patent ID: 6453781
Filing Date: 2002-09-24
Classification: B25B,F16B

Abstract:
A system comprising:a screw comprising a shank and a screw head connected to the shank; and a fastening tool comprising a fastening tool head tip; wherein the fastening tool head tip comprises a plurality of splines, and the screw head comprises a mortise hole that has a tapered configuration and the screw having a longitudinal axis; the mortise hole has a circular cross section, and having a plurality of lugs that project toward the longitudinal axis, and having a corresponding number of circular sections between adjacent lugs; the lugs have a front face having a conicity &agr; that is between 5 and 12.5 degrees, the circular sections having a conicity &bgr; that is between 20 and 30 degrees, the lugs having side faces having an angle C that is between 15 and 35 degrees; and a faces wedge effect provides a quick safe coupling between the lugs of the screw head and the splines of the fastening tool.