Pump dispenser
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United States of America Patent
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-
Nov 24, 1998
Grant Date -
N/A
app pub date -
Jul 29, 1997
filing date -
Jul 29, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Lotion pump has a stepped piston telescoping inside a stepped body to define a pumping chamber. The piston has in the wall of the piston inlet and discharge apertures, one above the other, to the pumping chamber. A stem integral with the actuator spout has a sealing head inside the piston which shuttles back and forth between positions at which it covers one aperture or the other. Shuttling is implemented by lost-motion between the actuator spout/stem and piston. A spring urges the stem up at all times.
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