POSITIVE AIR SHUT OFF DEVICE FOR BAG-IN-BOX PUMP
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United States of America Patent
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Issued Date -
Sep 23, 2010
app pub date -
Mar 20, 2009
filing date -
Mar 20, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a device for turning off a pump. In operation, when the device is activated there is vacuum pressure in a syrup chamber. A diaphragm acting in response to the vacuum causes a piston assembly in the syrup chamber to move in the one direction (e.g. right), thus compressing a W-shaped spring in the air chamber. As the piston assembly moves, a spring holder of the W-shaped spring also moves to the one direction. As the W-shaped spring is compressed over and passed the most compressed position, the W-shaped spring moves a valve assembly in the air chamber to an opposite direction (e.g. left) and blocks a hole in a spool that otherwise allows air to pass through the air chamber to activate the pump. When the air is stopped, this turns off the pump.
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