Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1994-04-25
1995-05-30
Noland, Kenneth W.
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187289, B66B 904
Patent
active
054194113
ABSTRACT:
In the energy conservation type hydraulic elevator, a load carrying elevator and a balancing elevator are each provided on a respective hydraulic cylinder. The hydraulic cylinders are connected to one another by a fluid circuit. The balancing elevator is weighted so as to minimize the power input required of a hydraulic pump in the fluid circuit. In the speed control method of a hydraulic elevator, a negative pressure is first produced in a fluid path connecting a hydraulic pump and a control valve. Descent of the elevator is then permitted to start by opening a control valve, allowing hydraulic fluid to flow from a cylinder, by way of a hydraulic pump, to an oil tank. The hydraulic pump and a motor rotate with the hydraulic fluid, and the motor is rotated at a synchronous number of revolutions by switching on an inverter power source when the number of revolutions has reached the synchronous number of revolutions of the motor.
REFERENCES:
patent: 4593792 (1986-06-01), Yamamoto
Kaisei Kogyo K.K.
Noland Kenneth W.
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