FIELD: oil and gas producing industry. SUBSTANCE: body with gripping members has chamber filled with fluid. Chamber is closed in its upper part with membrane, and in lower part, with piston connected with linkage. Accommodated inside body along its axis is core movable relative to body. Core is rigidly connected with linkage. Core has cone protrusion in its lower part to interact with gripping members at the moment of their bringing out of working position. EFFECT: higher efficiency. 3 dwg
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