Method and apparatus for directional boring
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United States of America Patent
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-
Mar 13, 2001
Grant Date -
N/A
app pub date -
Jul 27, 1998
filing date -
Jul 29, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In directional boring using a boring apparatus having a driven string and a drill head with an excavating tool moving in an orbit about the longitudinal axis of the string, the tool moves with substantially constant angular velocity when boring straight ahead, but when boring along a curve it is stopped and set in vibration in order to obtain more accurate control of the curve.
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