ROCK-BREAKING IMPLEMENT FOR PERCUSSIVE MACHINES

ROCK-BREAKING IMPLEMENT FOR PERCUSSIVE MACHINES A rock-breaking implement, preferably for a self-pro pelled percussive machine for driving boreholes, having a body, at least a part of the body facing the borehole faces being cylindrical in shape. The body is provided with rock-breaking wedges which are arranged in such a manner that their blades extend radially at the end face of said body. The body has grooves opening outside to the periphery of the body and designed to remove broken rock, said grooves extending along helical lines and intersecting one another so that portions of the body located between the intersecting grooves define said rock-breaking wedges. Edges of said wedges which extend on the periphery of the body within the cylindrical part thereof define a continuous circle when projected to the plane of transverse section of the body and are designed for forming the walls of the borehole.