ROCK-BREAKING TOOL FOR DRILLING WITH REVERSE CIRCULATION OF CLEANING AGENT Russian patent published in 1994 - IPC

FIELD: drilling. SUBSTANCE: rock-breaking tool has body with slime taking space, working members located on face, adapter with pressure and suction conduits communicating with the help of ejector. Slime taking space has conical shape. Smaller base of space communicates with ejector. Pressure conduit is branched into conduits for feed of cleaning agent to drill hole and to ejector. Their areas relate as 0.2: 0.5. Body has by-pass conduit and axial ducts placed uniformly over circumference which communicate with pressure conduit through by-pass conduit. EFFECT: enhanced efficiency of drilling, operational stability. 8 cl, 1 dwg