ROLLING-CUTTER DRILLING BIT Russian patent published in 2003 - IPC

FIELD: drilling equipment; particularly, designed of rolling-cutter drilling bits for drilling wells in oil, gas, geological prospection and ore mining industries. SUBSTANCE: rolling-cutter drilling bit has unit assembly including rolling cutter with bearing from journal, and sleeve whose conjugated surfaces are conical, and thrust bearing, locking device in form of split flange secured by fastening members and brought beyond boundaries of journal working zone and seal. Locking device is located in annular grooves of journal and cutting roller. Drilling bit has separate self-contained part such as nipple, body with legs, and unit in assembly with connector. Journal middle part has mounting bead. Made on journal end are plane-parallel flats and slots. Journal cavity accommodates mutually perpendicular through holes. Leg ends have U-shaped recesses and slots. EFFECT: simplified manufacture and assembly, reduced labor input in manufacture of drilling bits, reliable in operation and convenient in use. 5 cl, 5 dwg