Opposed button thrust surfaces for earth boring bit

Details Opposed button thrust surfaces for earth boring bit Opposed button thrust surfaces for earth boring bit

E - Fixed Constructions

21

B

255/74

E21B 10/16 (2006.01)

Patent

CA 1194468

ABSTRACT OF THE DISCLOSURE An earth boring bit has thrust surfaces with enhanced cooling features. The bit has a body with three depending bearing pins. A cutter having an axial cavity is mounted on each bearing pin. The bearing pin and the cavity have mating thrust shoulders. Hard metal inserts or buttons are spaced around each of the shoulders and secured interferingly in mating holes. The buttons in one of the shoulders protrude slightly from the shoulder to allow air to flow past.

421811

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