Pump with pressure-indication means
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United States of America Patent
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Jul 21, 2009
Grant Date -
Oct 14, 2004
app pub date -
Oct 17, 2001
filing date -
Oct 17, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Pump for applying an increased or reduced pressure to a container. The pump is provided with a plate-like part which reacts to the pressure difference between the container and the environment. This part can preferably adopt two stable positions, and a change is signalled. This change can be brought about, for example, by the sound generated as a result of the plate-like part turning over. The pitch and the like of the sound can be influenced by arranging the plate-like part in a hollow piston and providing the latter with openings leading to the environment.
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