Patent ID: 8628278

Claim:
A drill, comprising: a drill end face; at least two end-face major cutting edges on the end face; first faces contiguous to the major cutting edges and the first faces descending in a first direction; first flanks contiguous respectively to the at least two major cutting edges and the first flanks descending in a second opposite direction with respect to the first faces; at least two end-face taperings out, each forming a center cutting edge which is contiguous to the major cutting edges; second faces descending in the first direction and contiguous to the at least two end-face taperings out; a chisel cutting edge running between the at least two center cutting edges; minor cutting edges provided in a region of a circumferential surface of the drill, each major cutting edge being associated with a respective minor cutting edge; the at least two major cutting edges being formed by a line of intersection of the first faces with the first flanks; the first faces of the major cutting edges and the second faces of the center cutting edges being arranged at an obtuse angle to one another; the first flanks having respective segments, and the segments are arranged at an obtuse angle to one another; the segments of the first flanks being associated with the second faces of the center cutting edge and to the first faces of the major cutting edge; the center cutting edges adjoining the major cutting edges; and the first flanks being angled opposite to the first and second faces so that the major cutting edges and the center cutting edges run at a constant apex angle α outward in the direction of a circumferential surface of the drill.