DEVICE FOR DIRECTED DRILLING OF BORE HOLES OF PARALLEL CUT Russian patent published in 1998 - IPC

FIELD: mining; applicable in directed drilling of parallel cut bore holes with their use as compensation hollows in driving of mine workings. SUBSTANCE: device includes guide member made in the form of two coaxial branch pipes interconnected by tubular rod, drilling rod with bushing and crown bit. In this case, guide member is directly secured to bushing and drilling crown bit is located between coaxial branch pipes to guide member at a distance from its axis if not more than radius of drilling crown bit. EFFECT: higher efficiency of directed drilling of parallel cut bore holes. 3 degl