Rotary mining tools
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United States of America Patent
Stats
-
Jan 19, 1993
Grant Date -
N/A
app pub date -
May 23, 1991
filing date -
May 23, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotary mining tool having a steel body adapted to be driven axially and turned in a rotational arc relative to its axis and being provided with a hardened wear surface with a cutting edge adapted for cutting engagement with a work area under the axial thrust of said tool body, the wear surface and cutting edge being constructed and arranged with a negative rake angle and a negative skew angle to position the wear surface for such cutting engagement under substantially total compression to thereby minimize tensile shear forces that would tend to break or crack the hardened wear surface.
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