Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1992-11-19
1994-09-20
Skudy, R.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 292, 187 68, B66B 904
Patent
active
053491424
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 so that oil is drawn into the fluid flow path from an oil tank by way of a nonreturn 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.
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patent: 4807724 (1989-02-01), Martin
Berhane Adolf
Kaisei Kogyo K.K.
Skudy R.
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