Patent ID: 6820534
Filing Date: 2004-11-23
Classification: F15B

Abstract:
A piston chamber assembly comprising:a chamber; a piston slideably received in said chamber, said piston having a first piston side and a second piston side; a first inlet for communicating a fluid into said chamber on said first piston side; a second inlet for communicating a fluid into said chamber on said second piston side; an actuator movable between a first position and a second position, said actuator for selectively opening said first inlet and closing said second inlet when in said first position and said actuator for selectively closing said first inlet and opening said second inlet when in said second position wherein said piston is coupled to drive said actuator between said first position and said second position; said actuator comprising a body in said chamber, said body selectively movable between a first direction towards said first position and a second direction towards said second position; said piston arranged to impart momentum to said actuator selectively between said first direction and said second direction, thereby moving said actuator between said first position and said second position; said actuator comprising a first portion and a second portion, said piston supported to move between said first portion and said second portion alternating in said first direction and said second direction to impart momentum to one of said first portion and said second portion; said first portion closing said first inlet in said second position and said second portion closing said second inlet in said first position; and a retaining feature for maintaining said actuator in one of said first position and said second position until a predetermined amount of momentum is received by said actuator.