Pumps – Motor driven – Fluid motor
Patent
1994-10-27
1996-09-10
Freay, Charles
Pumps
Motor driven
Fluid motor
417402, 91341R, F04B 1700
Patent
active
055540112
ABSTRACT:
A vacuum powered pump includes a spring biased piston or diaphragm in a vacuum chamber coupled to a source of vacuum. When vacuum is applied to the vacuum chamber, the piston or diaphragm is moved in a first direction against the spring. A delayed action valve is coupled to the vacuum chamber to allow ambient air to enter the chamber only after the piston or diaphragm has been moved a substantial distance in the first direction. When the delayed action valve opens, air enters the vacuum chamber and the force of the entering air together with the bias of the spring propels the piston or diaphragm in a second direction opposite the first direction. The delayed action valve automatically closes and the process repeats so long as a vacuum source is coupled to the vacuum chamber. The reciprocal movement of the piston or diaphragm effects a pulsatile pumping of fluid through a fluid chamber having at least one check valve.
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Bales Thomas O.
Sixto, Jr. Robert
Smith Kevin W.
Solar Matthew S.
Freay Charles
Gordon David P.
McAndrews Roland G.
Symbiosis Corporation
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