Precompression pump, for dispensing liquid products from containers
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United States of America Patent
Stats
-
Mar 26, 1991
Grant Date -
N/A
app pub date -
Nov 7, 1989
filing date -
Dec 9, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The improved precompression pump has a body in which a hollow stem is slidingly disposed under the control of a knob or pushbutton provided with a nozzle. On the stem there is mounted a piston arranged to move along the stem against the action of a spring to uncover ports through the stem which communicate with the cavity in the stem. A non-return (intake) valve is positioned between the piston and a dip tube which is immersed in the product to be dispensed. The spring has a portion which is substantially cylindrical and another portion which is substantially conical, and moreover is not in contact with the product. The spring is secured at an intermediate point to the stem, acts at one end against the piston and is secured at its other end to the body.
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