Down-the-hole drill hammer having a reverse exhaust system and segmented chuck assembly
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United States of America Patent
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Aug 12, 2014
Grant Date -
Mar 11, 2010
app pub date -
Nov 18, 2009
filing date -
Mar 31, 2008
priority date (Note) -
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Abstract
A down-the-hole drill hammer is provided that includes a housing, a solid core piston mounted within the housing, a seal located between the solid core piston and the housing, and a backhead configured to exhaust working fluid volumes about a proximal end of the DHD hammer. The backhead includes a check valve assembly having a plug seal that can be moved to a closed seal position by gravity. A DHD hammer having a segmented chuck assembly is also provided. The segmented chuck assembly includes a plurality of chuck segments forming a cylindrical chuck assembly.
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