Rock drill
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 28, 1990
Grant Date -
N/A
app pub date -
May 31, 1989
filing date -
Jun 18, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rock drill having a drilling head which, in an asymmetric arrangement relative to the main cutting tip, has at least one additional secondary cutting tip, the angle enclosed between the single cutting edge of the main cutting tip and the secondary cutting tip being formed as an acute angle.
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