Rock drill
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United States of America Patent
Stats
-
May 15, 1990
Grant Date -
N/A
app pub date -
Apr 21, 1989
filing date -
Apr 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rock drill for rotary and/or percussive stress, in particular for use in percussion or hammer drilling machines, is proposed, which by its geometrical design makes improved efficiency and simplified production possible. For this purpose, the feed spiral 5 is designed alternately with horizontal feed sections 8,8' with a 0.degree. pitch, and adjoining lead sections 9,9', the respective feed sections assuming an angle of rotation of 90.degree. on the drilling tool.
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Cited Art Landscape
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