DRILL BIT Russian patent published in 2001 - IPC

FIELD: drilling equipment. SUBSTANCE: invention is related to drill bits used in percussion-rotary drilling in especially hard rocks and refers to hard-alloy inserts for drill bits and to removal of rock particles. Proposed drill bit includes body with system of blow-through conduits whose head part is set with carbide inserts with displaced vertexes of working parts. Vertex of each next insert with reference to preceding one in the limits of circular zone of break and with regard to center of axis of drill bit is oriented through 180 degrees. Outlets of blow-through conduits are so arranged that each one opens onto various circular zones of break. EFFECT: increased drilling efficiency and prolonged service life of drill bit. 3 dwg