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

1982-01-19

1984-01-24

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

E21B 1008

Patent

active

044270810

ABSTRACT:
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.

REFERENCES:
patent: 2032575 (1936-03-01), Harrington
patent: 2228286 (1941-01-01), Ross
patent: 4056153 (1977-11-01), Miglierini

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