Drill bit assembly

Details Drill bit assembly Drill bit assembly

1986-08-11

1987-11-17

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175339, 175373, 175391, E21B 1026

Patent

active

047067659

ABSTRACT:
A drill bit assembly comprised of a pilot bit and a plurality of add-on reamer sections which are sized to progressively increase the diameter of the hole in measured increments. Both the pilot bit and the reamer sections have two cutter elements which take advantage of the bi-center concept and both use knife edged cutters instead of teeth to drill the hole.

REFERENCES:
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patent: 3397928 (1968-08-01), Galle
patent: 4031974 (1977-06-01), Peterson
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