Patent ID: 7913777

Claim:
A rock drill for rotational and percussive action, with a drill head, a conveying helix, and a longitudinal drill axis, wherein the drill head includes at least one secondary cutting element with a front and a rear lateral face, and wherein the secondary cutting element has a center of mass and a cutting edge, the center of mass and the cutting edge defining a first plane, the front lateral face of the secondary cutting element defining a second plane, and the rear lateral face of the secondary cutting element defining a third plane, wherein the longitudinal drill axis intersects the first plane at a first intersection point, the longitudinal drill axis intersects a plane selected from the group consisting of the second plane, the third plane, and both at a point selected from the group consisting of a second intersecting point, a third intersecting point, and both the first plane and a plane selected from the group consisting of the second plane, the third plane, and both is inclined in a rotary direction of the drill bit, the longitudinal drill axis and the first plane form a first acute angle in the direction of advancement of the rock drill, and the longitudinal drill axis and a plane selected from the group consisting of the second plant, the third plane and both form an angle selected from the group consisting of a second angle, a third angle, and both in the direction of advancement of the rock drill, wherein the first intersecting point is located between a drill bit tip and the center of mass of the secondary cutting element, and the first acute angle is greater than the second angle.