Shaft drill bit with overlapping cutter arrangement

Details Shaft drill bit with overlapping cutter arrangement Shaft drill bit with overlapping cutter arrangement

1979-05-29

1981-02-03

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175 53, 175376, 175378, E21B 1012, E21B 1016, E21B 1022, E21B 1028

Patent

active

042483140

ABSTRACT:
An earth boring drill bit for large diameter shafts has an improved cutter arrangement. The drill bit has a cutter support member with a number of cutters mounted to it for disintegrating the earth formation face. At least one inner cutter is mounted near the center for cutting the center area. A number of gage cutters are mounted at the periphery to cut the gage area of the shaft. A number of intermediate cutters are spaced between the inner and gage cutters. Each intermediate cutter overlaps one-half of its width with an adjacent intermediate cutter.

REFERENCES:
patent: 1747909 (1930-02-01), Seifert
patent: 2949281 (1960-08-01), Bauer et al.
patent: 3203492 (1965-08-01), Lichte
patent: 3204710 (1965-09-01), Bechem
patent: 3638740 (1972-02-01), Justman
patent: 3726350 (1973-04-01), Pessier
patent: 3756332 (1973-09-01), Crane
patent: 3762486 (1973-10-01), Grovenburg et al.
patent: 3805901 (1974-04-01), Coski

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