Patent ID: 6789991
Filing Date: 2004-09-14
Classification: F16B

Abstract:
A screw, comprising:a rod-shaped part including a cylindrical intermediate portion, and a conical front end portion extending longitudinally from the cylindrical intermediate portion, the conical front end portion tapering towards a pointed front end tip, the rod-shaped part defining a circumferential surface; a continuous spiral-shaped thread winding around both the cylindrical intermediate portion and the tapering front end portion of the rod-shaped part, the thread being uninterrupted about the cylindrical intermediate portion, said continuous spiral-shaped thread having a plurality of teeth integrally formed thereon, said plurality of teeth projecting radially with respect to a longitudinal axis of said rod-shaped part; and a plurality of cutting trenches recessed into the circumferential surface of the rod-shaped part so as to form edges with the circumferential surface for cutting bits off a workpiece when the screw is being screwed therein, longitudinally offset ones of the cutting trenches being separated by a portion of the thread the circumferential surface extending between adjacent ones of the cutting trenches.