Down-the-hole drill assembly
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United States of America Patent
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-
Apr 3, 2007
Grant Date -
Oct 21, 2004
app pub date -
Mar 23, 2004
filing date -
Mar 25, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention provides a down-the-hole drill assembly having exhaust passages from upper and lower chambers past the inner end of a bit and through the body of the bit to exit through the bit face. The construction of the assembly and bit obviates a foot valve tube from the head of the bit and the disadvantages associated with this component.
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Cited Art Landscape
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