Patent ID: 9249792
Filing Date: 2016-02-02
CPC Classification: F04B

Claim Text:
1. A pressurized gas operated pump comprising: a first cylinder; a first piston linearly traversable within the first cylinder along a first axis; a first flexible seal hermetically sealed to an interior surface of the first cylinder and the first piston to define a first liquid chamber and a first gas chamber within the first cylinder, the first liquid chamber and the first gas chamber being on opposed sides of the first piston and the first flexible seal; a second cylinder; a second piston linearly traversable within the second cylinder along the first axis; a second flexible seal hermetically sealed to the interior surface of the second cylinder and the second piston to define a second liquid chamber and a second gas chamber, the second liquid chamber and the second gas chamber being on opposed sides of the second piston and the second flexible seal; an elongate shaft linearly traversable along the first axis, the first and second pistons being fixedly attached to the elongate shaft; a manifold for introducing as into the first gas chamber while venting gas from the second gas chamber, and removing gas from the first gas chamber while introducing gas into the second gas chamber, the manifold being disposed adjacent to the second cylinder and the first cylinder being disposed adjacent to the second cylinder opposite from the manifold; a shuttle valve mechanism having a slide block, yoke attached to the elongate shaft and an extension spring, the slide being linearly traversable on the block and the yoke being pivotable about the slide, the, extension spring being attached to the yoke and the block to drive the slide to either first and second positions as the yoke is being traversed over center by the elongate shaft wherein each of the first and second positions reroutes compressed gas to either of the first or second gas chambers, the slide disposed at the first position to introduce compressed gas into the first gas chamber and to remove gas from the second gas chamber, the slide disposed at the second position to remove gas from the first gas chamber and w introduce gas into the second gas chamber; first and second gas channels routed from the manifold to the first and second gas chambers.