Patent ID: 6213230
Filing Date: 2001-04-10
Classification: B23B,E21B,Y10T

Abstract:
A drilling tool for drilling in a drilling direction, comprising:a drilling body having a drilling side, a first longitudinal central axis and a first recess passing through the drilling body and extending transversely relative to the drilling direction;cutting bits disposed on the drilling side of the drilling body;an axial bore in the drilling body;a centering drill having a centering drill shank received in the axial bore; andholding means for securing and positioning the centering drill in the bore and having a second longitudinal central axis,wherein the holding means extends in the first recess of the drilling body and penetrates the drilling tool and into the bore, so that the longitudinal second central axis of the holding means is transverse to and intersects the first longitudinal central axis of the drilling body, and wherein the centering drill shank has a second recess which completely passes through the shank to receive the holding means and is shaped so that the centering drill is movable relative to the drilling body in the axial direction.