Down-the-hole drill hammer having a sliding exhaust check valve
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United States of America Patent
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Jan 7, 2014
Grant Date -
Jan 12, 2012
app pub date -
Oct 21, 2010
filing date -
Jan 28, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A down-the-hole drill hammer having a housing, a backhead and a tubular sliding check valve assembly that includes a distal end, a threaded male proximal end, a supply inlet and an exhaust port. The exhaust port communicates between an interior of the backhead and an exterior of the backhead. The tubular sliding check valve assembly includes a distributor, a sliding valve, and a biasing member. The distributor has a central opening extending through the distributor, an aperture extending through the distributor, and an exhaust gallery. The sliding valve is slidable along the central opening. The biasing member biases the sliding valve to a closed position.
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