BORING CHISEL FOR WELL BORING WITH BLOW-DOWN OF PIT-FACE WITH AIR Russian patent published in 2004 - IPC

FIELD: boring equipment engineering.

SUBSTANCE: device has body with a nipple and blow-down channels for cleaning pit-face of drilled rock, rock-destroying means in form of roller hits mounted on pins of chisel claws made with channels by means of watertight rolling and sliding supports, locking finger placed in aperture of pin, compensating assembly for oiling watertight rolling and sliding supports, having straight cylindrical channel and plug for its sealing. Straight cylindrical channel is made with slant at sharp angle of 19°-27° to chisel axis. On locking finger a groove is made, which forms a hollow with wall of pin aperture, which hollow is connected to straight cylindrical channel, which is connected to hollow of nipple and with channels of claw pin. Compensating assembly for oiling watertight rolling and sliding supports has an additional channel connecting hollow of straight cylindrical channel to side surface of chisel claw, at exit of which locking plug is placed. Plug for sealing straight cylindrical channel is made in form of piston mounted on it between end stops for limiting its drive.

EFFECT: higher reliability of chisel operation and stability due to increased reliability of support operation, also driving is increased as well as mechanical speed of boring.

2 cl, 4 dwg