Shaft drill bit with overlapping cutter arrangement

Details Shaft drill bit with overlapping cutter arrangement Shaft drill bit with overlapping cutter arrangement

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 10/12 (2006.01) E21B 10/16 (2006.01) E21B 10/28 (2006.01) E21B 10/52 (2006.01)

Patent

CA 1110226

ABSTRACT OF THE DISCLOSURE An earth boring drill bit for large diameter shafts has an improved cutter arrangement. The drill bit has a cutter support member with a number of cutters mounted to it for disintergrating with earth formation face. At least one inner cutter is mounted near the center for cutting the center area. A number of gage cutters are mounted at the periphery to cut the gage area of the shaft. A number of intermediate cutters are spaced between the inner and gage cutters. Each intermediate cutter overlaps one-half of its width with an adjacent intermediate cutter.

341026

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