Rotary cone type rock bits

Details Rotary cone type rock bits Rotary cone type rock bits

E - Fixed Constructions

21

B

255/63

E21B 10/00 (2006.01) E21B 10/22 (2006.01) F16C 33/80 (2006.01)

Patent

CA 2034628

Abstract of the Disclosure An earth boring bit of the type having three rotary cone cutters carried on bearing pins depending from respective head sections is disclosed. Adjacent the rear face of a cutter is located a portion of the respective head section commonly known as the shirttail. The invention discourages the intrusion of cuttings into the bearing surfaces or seals and reduces the likelihood of fracture of the shirttail. This is achieved by forming the coacting faces as truncated conical surfaces instead of the usual configuration of the prior art which is arranged substantially perpendicular to the bearing pin axis.

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