Patent ID: 7975767

Claim:
Apparatus for controlling a downhole device, the apparatus comprising a housing, a control line, a shuttle device, a mandrel connected to the downhole device and moveable within the housing between at least three stops, each of the three stops defining a different configuration of the device; and a detent mechanism comprising a locking device which is movable relative to the mandrel to engage the mandrel to selectively lock the mandrel in one of the at least three stops within the housing; wherein the locking device comprises at least one dog on one of the mandrel and the locking device that is adapted to engage with a respective groove on the other of the mandrel and the locking device; wherein the locking device is unlocked from the mandrel by the movement of the shuttle device; and wherein a pressure differential is applied via the control line to the shuttle device to activate movement of the shuttle device to engage the locking device thereby disengage the locking device from the mandrel, allowing the mandrel to move between the at least three stops; and wherein the locking device can hold the mandrel in position while the shuttle device returns to its initial position for another cycle.