Down-the-hole drill reverse exhaust system
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United States of America Patent
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Nov 6, 2012
Grant Date -
Jul 29, 2010
app pub date -
Jan 28, 2009
filing date -
Jan 28, 2009
priority date (Note) -
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Abstract
A DHD hammer that can exhaust working air volumes partially through a proximal end of the DHD hammer's actuator assembly includes a drive chamber, a return chamber, and a backhead that includes exhaust ports. Working air volumes from the drive chamber are exhausted through the backhead while working air volumes from the drive chamber are exhausted primarily through a drill bit.
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