Down-the-hole drill hammer having an extendable drill bit assembly
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United States of America Patent
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May 14, 2013
Grant Date -
Oct 6, 2011
app pub date -
Apr 1, 2011
filing date -
Apr 1, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A down-the-hole drill hammer assembly includes a casing, a drill stem, a drilling lug segment and a pilot drill bit is provided. The drill stem is housed within the casing and includes an abutment surface. The drilling lug segment is slidably engaged with a distal end of the drill stem and movable between an initial configuration and an extended configuration. The drilling lug segment includes a proximal end engageable with the abutment surface of the drilling lug segment. The drill stem is movable between first and second positions within the pilot drill bit. In moving to the second position, the drill stem slidingly engages the drilling lug segment and moves the drilling lug segment to the extended configuration.
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