Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent
1993-02-12
1994-11-08
Bagnell, David J.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by longitudinally relatively movable...
175289, 175384, E21B 1062
Patent
active
053618599
ABSTRACT:
A drill bit for use with earth drilling equipment, the drill bit having a body and movable cutting members or blades variably positionable between a first position in which the diameter defined by the cutting members is generally equal to or less than the diameter of the drill bit body and a second position in which the diameter defined by the cutting members is greater than the diameter of the drill bit body. The second, expanded position is assumed by the cutting members when they are in contact with the bottom of a hole and are thereby urged upwardly relative to the bit body. The first, retracted position is assumed by the cutting members when the drill bit is being tripped into or out of the hole and, because the cutting members are essentially retracted relative to the bit body, the drill bit does not become jammed downhole. A fixed-blade adaptation of the invention is also contemplated.
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Bagnell David J.
Baker Hughes Incorporated
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