DEVICE FOR HOLE DRILLING Russian patent published in 1994 - IPC

FIELD: mining and construction. SUBSTANCE: device has casing with drives of feed and rotation, and auger string with feed and rotary drives. Feed drives of casing and auger strings are made of screw installed on base machine, and nut installed on bracket connected with casing and auger strings. Nut of feed drive is made in form of inner half-coupling of two overrunning clutches whose outer half-couplings are secured to bracket. One of overrunning clutches has disengaging mechanism which is made of nut rotary drive, conical surface of bushing interacting with nut, and bell-crank hinged to outer half-coupling and interacting by its one arm directly with bushing, and by its other arm, with bushing executing angular motion by means of flexible link. EFFECT: extended functional capabilities. 5 dwg