Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1995-06-06
1997-01-14
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175428, 175430, 175431, 175434, E21B 1016, E21B 1052
Patent
active
055929958
ABSTRACT:
An earth-boring bit has a bit body and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows including an outer or heel row of cutting elements. At least one of the cutting elements in the heel row has an outermost surface at least partially formed of super-hard material that defines a cutting edge for shearing engagement with the sidewall of the borehole as the cutters roll and slide over the bottom of the borehole during drilling operations.
REFERENCES:
patent: 4694918 (1987-09-01), Hall
patent: 5282512 (1994-02-01), Besson et al.
patent: 5341890 (1994-08-01), Cawthorn et al.
Besson Alain
Isbell Matthew R.
Meany Nigel
Pessier Rudolf C. O.
Scott Danny E.
Baker Hughes Incorporated
Felsman Robert A.
Novosad Stephen J.
Perdue Mark D.
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