Percussion assisted rotary earth bit and method of operating the same
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United States of America Patent
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Jul 1, 2014
Grant Date -
Apr 21, 2011
app pub date -
Dec 20, 2010
filing date -
Aug 6, 2008
priority date (Note) -
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Abstract
A hammer assembly is actuated to drive an earth bit through a formation. The hammer assembly includes a piston, and a flow control tube which extends through the piston. The flow control tube includes drive and return guide ports. The piston is repeatably moveable relative to the drive and return guide ports in response to a fluid flow through the flow control tube. In this way, the hammer assembly is actuated.
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