Black Decker Inc.

Steve Brocket

Christian Bluemel

Andreas Hammer

Christoph Gastinger

A cutting head for a drill bit comprises four substantially identically shaped cutting arms extending radially from a common central axial point, each cutting arm comprising a cutting edge extending, outwardly and axially backwards from the common central axial point. The cutting edges are equianguiarly spaced apart from each other about the central axis of the cutting head. Each cutting, arm further comprises a side chamfer extending between its radially outer face and its rotationally trailing side face.

Growing community of inventors

Durham, United Kingdom

Steve Brocket