Boring or penetrating the earth – With mechanical cleaner for bit or cutter element
Reexamination Certificate
2006-05-16
2006-05-16
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With mechanical cleaner for bit or cutter element
C175S371000, C384S092000
Reexamination Certificate
active
07044242
ABSTRACT:
A roller-cone drill bit in which a large groove is machined into the backface of each cone, near the crack where the cone meets the arm assembly. By making the outer lip of this crack more exposed to the open volume of turbulent flow, turbulence near the crack is increased, deposit of sediments near the crack is reduced, and infiltration of sediments through the crack is also reduced.
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Hughes Christensen, Ultra Max High Performance Bits For Motor and High Speed Applications, 1998, p. 3.
Miglierini Raul A.
Osborne, Jr. Andrew J.
Bagnell David
Bomar Shane
Groover Robert O.
Groover & Holmes
Holmes Patric C. R.
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