Keyed connection for drill bit
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United States of America Patent
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-
Jul 8, 2008
Grant Date -
Jun 21, 2007
app pub date -
Dec 15, 2005
filing date -
Dec 15, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A portion of a drilling tool having a drill bit driven in a rotating motion and in an axial percussion motion comprises a keyed connection between the drill bit and a driver sub that receives the drill bit. The keyed connection comprises a transverse member coupling the drill bit to a driver sub having a bore within which the drill bit is received. The driver sub has a pair of opposed openings and the bit has an axial slot. The openings and the slot are dimensioned to receive the transverse member. The keyed connection transmits force to the drill bit to drive the drill bit during operation and removably secures it in the driver sub.
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