Down hole hammer having elevated exhaust
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United States of America Patent
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Sep 6, 2011
Grant Date -
Aug 12, 2010
app pub date -
Feb 11, 2009
filing date -
Feb 11, 2009
priority date (Note) -
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Abstract
A percussive assisted rotary drill includes a top sub for connection with a drill pipe. The drill pipe imparts torque to the drill and also supplies motive fluid to the drill. The drill includes a shank adapter to facilitate affixing a rotary drill bit to the drill. The motive fluid is divided between a bit flow which flows through the bit to clear debris at the bottom of the drill, and an actuator flow. An actuator, which may be in the form of a reciprocating piston, moves within the drill under the influence of the actuator flow to impart cyclical blows to the shank adapter. At least a portion of the actuator flow portion of the motive fluid is exhausted through the top end of the drill.
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