Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1988-08-30
1989-06-13
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175411, 175413, E21B 1042, E21B 1046
Patent
active
048383660
ABSTRACT:
A drill bit for drilling holes in earth formations including a bit body having an integral shank for connection to a drilling machine stem and integral radial mounting wings for supporting removable cutter blades, and a removable cutter blade secured on each wing, each cutter blade having a tungsten carbide front drilling face arranged at a negative rake angle and an outside side face having a forward cutting edge of tungsten carbide and a relieve angle extending rearwardly and inwardly toward the axis of the bit for minimizing the mass of the bit exposed to the bore hole wall during drilling for reducing the temperature of bit. The bit has a longitudinal bore and lateral angular bores for air drilling fluid.
REFERENCES:
patent: 1557743 (1925-10-01), Terrill
patent: 2604305 (1952-07-01), Livingstone
patent: 2861779 (1958-11-01), White
patent: 3106973 (1963-10-01), Christensen
patent: 3463256 (1969-08-01), White
patent: 3545554 (1970-12-01), Bardwell
patent: 3672455 (1972-06-01), Foster, Jr.
patent: 4026372 (1977-05-01), Hampson
patent: 4252202 (1981-02-01), Purser, Sr.
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