Patent ID: 7131504

Claim:
An expandable apparatus for use in a wellbore, comprising: a body having a top portion and a bottom portion; a blade assembly disposed on the bottom portion of the body, the blade assembly movable between a closed position whereby the expandable apparatus has a smaller outer diameter and an open position whereby the expandable apparatus has a larger outer diameter; and a hydraulic cylinder disposed around the body, the hydraulic cylinder movable between a first position and a second position, wherein the first position, the hydraulic cylinder is spaced apart from the bottom portion of the body at a first axial distance and in the second position the hydraulic cylinder is spaced apart from the bottom portion of the body at a larger second axial distance; a fluid pressure activated member disposed between the hydraulic cylinder and the body, the fluid pressure activated member configured to selectively allow the blade assembly to move from the closed position to the open position as the hydraulic cylinder moves from the first position to the second position.