Rock bit with improved shirttail ventilation

Details Rock bit with improved shirttail ventilation Rock bit with improved shirttail ventilation

E - Fixed Constructions

21

B

255/74

E21B 10/22 (2006.01) E21B 10/18 (2006.01) E21B 10/24 (2006.01)

Patent

CA 1176235

ABSTRACT OF THE DISCLOSURE An earth boring bit of the air cooled bearing type has features to improve cleaning of the borehole. The bit has three bit legs, each with a depending bearing pin that receives a rotatable cutter. Bearings are located between the bearing pin and the cutter. Passages communicate drilling fluid from the drill string to the bearings. A slot between the bit leg and the backface of the cutter enables air to be discharged from the bearing pin into the borehole. The portion of the slot on the lower side of the bearing pin is greater in cross-sectional flow area than the portion on the upper side. The portion of the slot on the lower side exposes the outer ends of the roller bearings to the borehole.

414247

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