Patent ID: 7392863
Filing Date: 2008-07-01
Classification: E21B

Abstract:
1. A rock drill bit adapted for percussive drilling, the drill bit comprising: a bit body; a head portion defining a longitudinal center axis, the head portion comprising a front face having an outer surface portion, and an inner surface portion disposed radially inside of the outer surface portion, the inner surface portion being partially recessed by a cavity with respect to the outer surface portion, and a plurality of fluid channels extending through the head portion and communicating with the cavity for conducting a flushing medium thereto, wherein the inner surface portion comprises a raised portion carrying a plurality of buttons, wherein an imaginary circle intersecting centers of the fluid channels also intersects an equal number of buttons, and wherein the cavity on the front face of the head portion radially extends in at least one radial direction to end at a peripheral groove in the bit body.