Earth boring bit with extended gage

Details Earth boring bit with extended gage Earth boring bit with extended gage

E - Fixed Constructions

21

B

255/78

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

Patent

CA 1151639

ABSTRACT OF THE DISCLOSURE An earth boring bit particularly for use in drilling mining blast holes, has features for reducing the possi- bility of cutter drag and reducing wear on the bit legs. The bit is of the type having three bit legs, a bearing pin depending from each bit leg, and a cutter with a central cavity mounted on each bearing pin with roller bearings. The roller race for the roller bearings is formed in the central cavity of the cutter. The lower side of each bearing pin commences at the outer side of each bit leg, eliminating the shirttail flange. Clearances are provided between the cen- tral cavity and the bearing pin at the backface for the discharge of air in a direction parallel with the bearing pin axis.

380276

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