DEVICE FOR SEALING OF BORE-HOLE Russian patent published in 1998 - IPC

FIELD: mining industry. SUBSTANCE: this is intended for sealing clearance between bore-hole wall and pipe at injecting liquid into fissured mass of rock matter. Device has pipe with non-return valves. Fitted over pipe is elastic hose-like sealing member. This member at both ends is gripped by clamping components provided with protruding lips located along sealing member and directed towards each other over its perimeter. Protruding ends of lips are of preset length and widening at their ends, and overlapping each other in cross-section. Provision of lips with protruding and widening ends makes device usable for wide range of injection pressure. EFFECT: higher efficiency. 7 dwg