APPARATUS TO DRILL MULTIHOLE BOREHOLE Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: guiding pipes bent in their lower parts are mounted in cavity of body. Upper rectilinear parts of the pipes are located on different heights to provide reliable aiming of drilling tool in definite direction. Funnels to prevent drill bit sticking in process of its lifting and lowering operations are mounted on upper and lower ends of guiding pipes. Lower end of guiding pipes is located in hole of body and shut by shutter. EFFECT: apparatus to drill multihole borehole is used for drilling of inclined parts of borehole shaft. 1 dwg