Anchoring dowel for brittle material

摘要

The anchor dowel (1) for a friable material has a piercing tip (3) with piercing teeth (14-16). The piercing tip has a drill portion. At the other end of the dowel is an abutment collar (5) and an external screw thread (7). The screw thread is positioned around the housing in one direction and the drill tip has a helical channel (10,11) in the same direction. Each channel opens to a flat surface at one wall of the piercing teeth.