BLADE AUGER BIT ADAPTED FOR HOLE DRILLING IN BOULDERY-PEBBLE DEPOSITS

摘要

FIELD: mining, fork-type rotary drill bits, for instance fish tail bits with detachable blades adapted to drill water, drainage, seismic and other technical wells.;SUBSTANCE: auger bit comprises body and blades installed on the body and extending at positive angle from the body. The blades are reinforced with rock-cutting members. Half of front edge of peripheral part of each blade facing well face lies in plane inclined at 15-20° angle to plane defined by front edge of inner blade part and is opposite to bit rotation direction.;EFFECT: increased operational efficiency.;2 cl, 3 dwg