Up leveling control system for small elevators
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United States of America Patent
Stats
-
Aug 3, 1993
Grant Date -
N/A
app pub date -
Aug 15, 1991
filing date -
Aug 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An up leveling control system for small elevators that uses an adjuster having a small orifice coordinating with an up speed metering edge of a separate spool in the form of a taper to meter the rate of flow of pilot oil from a bypass chamber to control the position of a bypass valve and thereby regulate the volume of oil flow proportionately to the elevator cylinder and to the pump reservoir.
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