FIELD: oil- refining industry. SUBSTANCE: coupler has gripping members made in the form of two double-arm levers disposed on opposite sides of second link. One lever arm is provided with grip jaw. Other arm is joined with body made in the form of rocking arm for radial displacement relative to pressure screw. Levers are spring-loaded. Screw is joined with second link for rotation. EFFECT: enlarged functional capabilities. 3 cl, 4 dwg
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