Underreamer
AssigneeTransco Manufacturing Australia Pty Ltd
InventorsRoy ESTES, George FYFE
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to an underreamer. In one aspect, the underreamer comprises a body, the body comprising at least one pocket therein, the underreamer further comprising at least one cutter secured with respect to the body, at least one actuating mechanism for moving the cutter between a retracted position in the pocket, and an extended position in which only the cutter projects from the body. In one aspect, the or each actuating mechanism comprises a piston for driving extension of the cutter, and a linkage to a cutter arm with respect to which the cutter is mounted, and a return spring for biasing the cutter to the retracted position.
Claims20
An underreamer comprising a body, the body comprising at least one pocket therein, the underreamer further comprising at least one cutter secured with respect to the body, at least one actuating mechanism for moving the cutter between a retracted position within the pocket, and an extended position in which only the cutter projects from the body.
An underreamer comprising a body, the body comprising at least one pocket therein, the underreamer further comprising at least one cutter mounted with respect to the body, at least one actuating mechanism for pivoting the cutter between a retracted position within the pocket, and an extended position in which the or each cutter is oriented to cut formation.
Dependencies are inferred from the claim text.