Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate
2008-07-08
2008-07-08
Gay, Jennifer H (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
C175S296000, C173S108000, C173S090000, C173S104000
Reexamination Certificate
active
07395883
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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International Search Report and Written Opinion of the International Searching Authority for PCT/US06/44342, ISA/US, 7 pages, mailed Jul. 25, 2007.
Gay Jennifer H
Hutchins Cathleen R
Klarquist & Sparkman, LLP
Rockmore International, Inc.
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