Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1993-01-14
1994-04-19
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175421, 175431, 175432, E21B 1054
Patent
active
053037871
ABSTRACT:
A non-coring rotary mining tool having a bit body constructed and arranged for rock boring as in roof bolting operations, and including PCD cutter inserts of preselected size mounted at a negative angle and having substantially continuous cutting edges defining a sinusoidal cutting path from the tool axis to the gauge-cutting margins thereof; and a method of drilling rock bores utilizing moderate rotational speeds, reduced axial thrust and delivery of flushing fluids at substantially higher pressures.
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Dang Hoang C.
Heywood Richard G.
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