WITHDRAWAL DISCHARGING PISTON PUMP
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United States of America Patent
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app pub date -
Jan 2, 2013
filing date -
Jun 12, 2008
priority date (Note) -
Abandoned
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Abstract
A pump assembly with a first pump which draws liquid from a reservoir and dispenses it to a second pump. The second pump receives the discharge from the first pump and air such that the second pump discharges both liquid and air. The first pump preferably has a piston movable in a first inner chamber and the second pump utilizes the same piston movable in a second outer chamber. Preferably, the second pump discharges in the withdrawal stroke, that is, while moving from a retracted position to a withdrawn position.
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