Cone retainer for a rotary rock bit

Details Cone retainer for a rotary rock bit Cone retainer for a rotary rock bit

1978-07-21

1979-07-17

Butler, Douglas C.

Cutlery

76108A, 308DIG11, F16C 1900

Patent

active

041613430

ABSTRACT:
The rolling cone cutters of a rotary rock bit are held in place on the bit's bearing pins without the use of the conventional ball bearing locking systems. The improved cone retainer includes a groove in the rolling cone cutters that cooperate with plugs or rods extending from the bearing pin. The plugs (rods) are positioned to bridge between the groove in the rolling cone cutters and bearing pins to retain the rolling cone cutters on the bearing pins. Expander rods are inserted through passages in the bearing pins to extend the plugs (rods) into the grooves in the rolling cone cutters and maintain the cutters in the proper position during the drilling operation.

REFERENCES:
patent: 1865706 (1932-07-01), Reed
patent: 2065740 (1936-12-01), Reed
patent: 2814465 (1957-11-01), Green
patent: 3361494 (1968-01-01), Galle
patent: 3746405 (1973-07-01), Welton

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