Patent ID: 7997354

Claim:
An expandable reamer tool comprising: an outer body having a fluid passageway extending therethrough; at least one blade configured to move relative to the outer body between a retracted position and an expanded position in a direction oriented at an acute angle of less than ninety degrees) (90° to a longitudinal axis of the outer body; and a moveable inner sleeve member configured to move from a first position to a second position in response to a predetermined hydraulic pressure differential between portions of the fluid passageway, to prevent hydraulic pressure within the fluid passageway from acting on the at least one blade in the first position, and to permit hydraulic pressure within the fluid passageway to act directly on the at least one blade in the second position; wherein the at least one blade is sized and configured to provide a clearance between the outer body and each lateral surface of the at least one blade adjacent the outer body of greater than about ten thousandths of an inch (0.010 in); and wherein the at least one blade comprises a base portion having an angled surface disposed at a first angle relative to the longitudinal axis of the outer body configured to wedge against an angled surface of the outer body disposed at a second, different angle relative to the longitudinal axis of the outer body, to center the blade in a blade plate when the blade is in the expanded position.