Fixed-volume liquid dispenser
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United States of America Patent
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Mar 20, 2012
Issued Date -
N/A
app pub date -
Sep 23, 2008
filing date -
Sep 23, 2008
priority date (Note) -
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Abstract
A dispenser for viscous liquids effectuates sequential operations by hydrostatic pressure on an assembly of two pistons separated from each other in a cylinder by a separation spring. When the piston assembly is embedded in material to be dispensed, the space between the pistons fills with material to be dispensed. Pressuring the reservoir by squeezing it or by the addition of pressurized gas, forces the piston assembly down the cylinder at the end of which is an opening from which material in the piston assembly can escape. One of the pistons moves toward the other end by pressure from the reservoir, causing material in the piston assembly to be dispensed. The volume inside the piston assembly defines and limits the volume of material that can be dispensed.
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