Rotary mining tools
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United States of America Patent
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Apr 19, 1994
Issued Date -
N/A
app pub date -
Jan 14, 1993
filing date -
May 23, 1991
priority date (Note) -
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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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