Pump with variable stroke piston
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United States of America Patent
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-
N/A
Issued Date -
Nov 1, 2007
app pub date -
Apr 27, 2006
filing date -
Apr 27, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A pump apparatus includes a housing located on an axis. The housing has a chamber, an inlet valve and an outlet valve. A piston driver is configured to axially reciprocate. A piston is a piston configured to reciprocate in the chamber to draw liquid into the chamber through the inlet valve during an intake stroke and to discharge the liquid out of the chamber through the outlet valve during a delivery stroke. A spring axially biases the piston to a base position relative to the driver, so that the driver, when reciprocating, will drive the piston to reciprocate. A preload structure preloads the spring to enable pressure of the liquid in the chamber to displace the piston away from the base position against the spring bias after the pressure exceeds a threshold level.
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