Improved rotary cone bit for cutting removal

Details Improved rotary cone bit for cutting removal Improved rotary cone bit for cutting removal

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.

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