System for raising and lowering the load support of an electric lift truck
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 26, 1999
Grant Date -
N/A
app pub date -
Mar 24, 1997
filing date -
Apr 19, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electric lift truck, an asynchronous electric motor, a reversible sealed pump driven by the motor, communicating with the hydraulic actuators and also with a reservoir, a device which measures the angular position and the angular velocity of the motor, and a control and monitoring unit which causes the motor to be supplied according to the required speed of raising and lowering of the load support and on the basis of data supplied by the measuring device are used for raising and lowering the load support by means of one or more hydraulic actuators. There is a saving of energy in raising; there is also a recovery of energy in lowering, in which the motor acts as a generator to recharge the accumulator batteries of the lift truck.
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