Screw and associated screw driver with internal funnel-shaped connection device in screw head, and funnel-shaped screw driver end

摘要

The screw may be of any type. One part of the top of the screw head (2) is funnel-shaped (4,4.1) in direction of the axis of the connection device for the screw driver (1) inside the screw head, and in direction of the screw shaft (3). The connection device is also funnel-shaped (2.2,5), so that when inserted, the screw driver engages on the funnel walls of the connection device and is clamped in place by pressure applied in direction of the screw shaft.