Hilti Aktiengesellschaft

Peter Sternberger

Markus Hartmann

Udo Hauptmann

Martin Richter

Reinhard Schulz

Stefan Dorner

A cup-shaped drill head with an inner conical surface () for force-locking connection with an exterior conical surface () of a driving drill shaft (), which at the leading end changes over into a cup base () with a center point (P), whereby in the change over from the cup base () to the inner conical surface () a lesser curvature (K) is present than at the center point (P).

Growing community of inventors

Augsburg, Germany

Peter Sternberger