Patent ID: 8662809

Claim:
A screw, comprising: a screw head, a screw shaft having a cylindrical part extending from the screw head and an approximately conical tip part, the tip part extending from an end of the cylindrical part and having a diameter that becomes continuously smaller towards a front end of the screw shaft, and the screw shaft having a thread that runs around the screw shaft in a plurality of turns until reaching the front end, wherein a front flank is positioned at the end of the cylindrical part of the screw shaft, or on the conical tip part of the screw shaft, the front flank having a diameter that is greater than a largest diameter of the conical screw tip part and said front flank revolving at least over a half part of the circumference of the screw shaft and being oriented facing towards the front end; and wherein the front flank extends in a transverse plane that is at least substantially perpendicular to a longitudinal axis of the screw.