HOOK Russian patent published in 2001 - IPC

FIELD: equipment for drilling of oil and gas wells. SUBSTANCE: hook has cylindrical hollow body, shoulder, spring, back nut, pressing bushing and thrust bearing. Body is made with solid upper cover. Back nut is connected with hook body. Shoulder is installed in body lower part and is removable in the form of captive nut. On internal side of captive nut circular groove is made to receive bearing. Groove depth exceeds height of bearing. Body inner diameter is smaller than outer diameter of bearing. EFFECT: higher operating reliability and simplified design of hook. 1 dwg