Percussion assisted rotary earth bit and method of operating the same
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United States of America Patent
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Jan 15, 2013
Grant Date -
Feb 11, 2010
app pub date -
Aug 5, 2009
filing date -
Aug 6, 2008
priority date (Note) -
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Abstract
A method of boring through a formation includes providing a drilling machine and drill string and operatively coupling an earth bit to the drilling machine through the drill string. An air flow is provided through the drill string at an air pressure less than about one-hundred pounds per square inch (100 psi) and an overstrike force is applied to the earth bit, wherein the overstrike force is less than about five foot-pounds per square inch (5 ft-lb/in2).
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