E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/18 (2006.01) E21B 10/08 (2006.01)
Patent
CA 2320396
An improved rotary cone bit includes a threaded end on a bit body for coupling to a drill string. The drill bit body includes two or more leg portions extending from one end thereof. From interval at each of the leg portions is a bearing pin that extends inwardly toward the longitudinal axis of the drill bit body. On each of the bearing pins, there is rotatably mounted a cutter cone having rows of cutting teeth as a part hereof. The bit shirttail comprises a plateau extending along the longitudinal axis of the bit body in substantially the same plane as the bearing pin surface area of the shirttail.
Kirby Eades Gale Baker
Saxton Robert L.
Varel International Inc.
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