Rotary rock bit with independently true rolling cutters

Details Rotary rock bit with independently true rolling cutters Rotary rock bit with independently true rolling cutters

E - Fixed Constructions

21

B

255/74

E21B 10/08 (2006.01) E21B 10/16 (2006.01)

Patent

CA 1174664

ROTARY ROCK BIT WITH INDEPENDENTLY TRUE ROLLING CUTTERS Abstract of the Disclosure A tri-cone rotary rock bit having true rolling conical cutters of different cone angle and with each cutter having a plurality of intermediate annular rows of cutting projections for disintegrating the borehole bottom. Such projections in the intermediate rows being true-rolling about a bottom distinct from the bottom cut by the projections on the remaining intermediate annular rows of the cutting projections of each cone are also at distinct separate distances from the center of rotation of the bit to produce a borehole bottom profile having concentric rows of crests and valleys.

418085

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