BOHRVORRICHTUNG ZUR HERSTELLUNG VON BOHRLOECHERN MIT HINTERSCHNEIDUNG

摘要

A drilling device for producing drill holes with undercuts and comprising a drill bit, a drill bit holder for receiving the drill bit and having a suction chamber, and a suction bell surrounding the drill bit holder and communicating with the suction chamber therein, the stem of the drill bit having a continuous axial bore communicating with the suction chamber and a plurality of slots arranged in a region of a cross-sectional enlargement of the stem.