Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1985-03-04
1986-09-09
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175350, E21B 1008
Patent
active
046103171
ABSTRACT:
A rotary bit having a pair of semi-spheres rotating about a shaft extending from a center tongue. The semi-spheres include a plurality of cutters arranged in a predetermined fashion to maximize cutting efficiency. The semi-spheres may be disposed slightly off-center from the bit's axis of symmetry to bias the bit in a particular direction.
REFERENCES:
patent: 191241 (1877-05-01), Kimball
patent: 1124242 (1915-09-01), Hughes
patent: 1195208 (1916-08-01), Griffin
patent: 3924695 (1975-12-01), Kennedy
Desjardins Donald A.
England John R.
Bui Thuy M.
Inco Limited
Kenny Raymond J.
Novosad Stephen J.
Steen Edward A.
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