Underreaming tool with overriding extended arm retainer

Details Underreaming tool with overriding extended arm retainer Underreaming tool with overriding extended arm retainer

E - Fixed Constructions

21

B

255/76

E21B 10/00 (2006.01) E21B 10/34 (2006.01) E21B 17/07 (2006.01)

Patent

CA 1064471

ABSTRACT An underreamer includes a mounting member and a plurality of cutter arms. Means pivotally mounts the cutter arms on the mounting member. Overridable means is operable for holding the cutter arms relatively outward in an underreaming position. The overriding means is operable to allow the cutter arms to move relatively inward upon forces on the cutter arms above a predetermined level.

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