FIELD: drilling equipment. SUBSTANCE: telescopic system made of cylinder housing piston is positioned between lower pipe of drill pipe string and face motor. Lower part of cylinder has holes communicating its internal space with pipe clearance. Cylinder is connected to drill pipe string and piston is linked to body of motor. Upper butt of piston carries location seat to house stationary or cast off headpiece provided with shank fitting overshot. EFFECT: adjustment of load on face in process of drilling. 5 dwg
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