Apparatus for controlling a hydraulic elevator
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United States of America Patent
Stats
-
Jun 10, 1986
Grant Date -
N/A
app pub date -
Aug 27, 1984
filing date -
Aug 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for controlling a hydraulic elevator in which a bias pattern signal for operating an electric motor at such a low speed that the cage will not move is superposed on a running pattern signal for running the cage, and the electric motor is controlled by the thus superposed pattern signals. Therefore, the amount of oil flowing into or out of the cylinder increases nearly in synchronism with the start of the running pattern, and the cage moves smoothly without generating vibrations.
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