Patent ID: 7258180

Claim:
A rotary hammer drill bit for use with a percussion drilling device or a hammer drilling device, said hammer drill bit comprising: a shank; a drill head on the shank; the drill head having a front side pointing in an advance direction thereof, said front side having a main cutting plate forming a main cutting axis, wherein the main cutting plate extends beyond a diameter of the drill head, has a tip lying on a longitudinal axis of the drill bit, and includes a plurality of radially inclined drill blades extending outward from the tip along the main cutting axis; and at least one pair of cutting pins which are affanged on both sides of the main cutting plate, wherein a maximal radial extent of at least one of the pins from the longitudinal axis of the drill bit is smaller than a maximal radial extent of the main cutting plate from the longitudinal axis of the drill bit, and the pins are symmetrically arranged with respect to the main cutting plate at an angle between 20° and 75° with respect to said main cutting axis.