Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1990-01-31
1991-08-20
Pellinen, A. D.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 126
Patent
active
050406396
ABSTRACT:
An elevator valve apparatus for controlling the hydraulic supply flow to the hydraulic actuator and the hydraulic discharge flow from the actuator, comprises a solenoid proportional control valve device for ascending, a solenoid proportional control valve device for descending, and a valve control unit for controlling both of the control valve devices with a predetermined acceleration characteristic and a predetermined deceleration characteristic by an open loop control system.
Furthermore, if preferable, the valve control unit carries out oil temperature compensating control, pressure compensating control, pre-start pressure raising compensation control, and feedback control of the supply flow in the low speed ascending.
REFERENCES:
patent: 4637495 (1987-01-01), Blain
patent: 4694935 (1987-09-01), Lawrence
patent: 4715478 (1987-12-01), Nakamura et al.
patent: 4932502 (1990-06-01), Blain et al.
patent: 4938119 (1990-07-01), Rita
Copy of "Elevator Kai", 1986, No. 84, vol. 21, pp. 3-8.
Nomichi Kaoru
Sasaki Hironori
Sotani Yasushi
Watanabe Shinya
Duncanson Jr. W. E.
Kawasaki Jukogyo Kabushiki Kaisha
Pellinen A. D.
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