Fork-lift system
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United States of America Patent
Stats
-
Aug 9, 1988
Grant Date -
N/A
app pub date -
Mar 16, 1987
filing date -
Mar 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A battery-operated electric-motor driven hydraulic-lift mechanism for a fork-lift vehicle employs a hydraulic accumulator which serves an intertia-free counterweight function, designedly to the degree that such counterweight action is a direct offset of a predetermined average-load condition, as seen by the hydraulic-lift actuator of the system. Electric-motor drive is utilized for up/down operation of the fork lift, only to the extend needed to displace hydraulic fluid into or out of the 'counterweighted' actuator. In some cases, such displacement will call for expending energy to add to or substract from the counterweight action; in other cases, the necessary fluid displacement results in an energy return to the system, i.e., in restoring energy to the battery.
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