US Patent 10385902 Screw and drive element with chamfer

Screw for introducing into an underground, comprising a screw shaft and a screw head which is adjoining the screw shaft, in which a drive is formed for rotary driving the screw by a drive element, wherein the drive comprises a hollow wing section at an outer side of the screw with a circular hollow core and hollow wings which are provided along the circumference, wherein the drive comprises a hollow recess section at an inner side of the screw, and wherein the drive at a transition between the hollow wing section and the hollow recess section comprises a chamfer section whose outer surface is angled with respect to an outer surface of the hollow wing section and with respect to an outer surface of the hollow recess section.