Down-the-hole drill drive coupling
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United States of America Patent
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Dec 23, 2014
Grant Date -
Feb 17, 2011
app pub date -
Mar 31, 2009
filing date -
Mar 31, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A down-the-hole drill hammer is provided that includes a housing, a piston mounted within the housing, a drill bit mounted below the housing, and a drive coupling operatively engaged with the housing and drill bit. The drive coupling can be configured with a plurality of lugs circumferentially disposed about the drill bit and coupled with the casing for providing rotation thereof. Alternatively, the drive coupling can be configured with segmented lugs configured to circumscribe the drill bit, or as a cylindrical chuck formed out of arch-shaped chuck segments which radially assemble onto the shank of the drill bit.
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