Pump assembly for hand fork-lift truck
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United States of America Patent
Stats
-
Jul 22, 2008
Grant Date -
Apr 14, 2005
app pub date -
Sep 8, 2004
filing date -
Sep 11, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered setting and connects the piston chamber with the tank in a neutral setting and in a pump setting, connects the piston chamber with the lift cylinder through a first check-valve, with the tank through a second check-valve, a third check-valve between the piston chamber and the annulus collector open to the piston chamber, and a reversing valve between the piston chamber and the annulus collector.
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