Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1974-02-12
1976-05-11
Schaefer, Robert K.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 104
Patent
active
039556492
ABSTRACT:
A floor level correcting device used in a hydraulic elevator comprises means for electrically detecting the vertical position of the elevator cage with respect to the floor landing and driving means for level correction, provided independent of a main power unit for driving the elevator cage. The detecting means comprises means provided in the elevator shaft and means provided in the elevator cage which detect, in co-operation with each other, the level of the cage with respect to the floor landing of the building in particular whether the cage is stopped in the proper landing position or shifted therefrom, so as to produce an electrical signal in accordance with the detected cage level to transmit the signal to the driving means for level correction. The driving means for level correction comprises an accumulator and an electromagnetic valve and the electromagnetic valve is actuated by the electric signal from the position detecting means, so that the hydraulic fluid in a cylinder forming a part of the driving mechanism of the elevator is withdrawn into a tank, or the hydraulic fluid in the accumulator is conducted into the cylinder to thereby correct the level of the cage.
REFERENCES:
patent: 1352742 (1920-09-01), Furlow
patent: 1944432 (1934-01-01), Hunter
patent: 2189193 (1940-02-01), Brown
patent: 2359112 (1944-09-01), Hymans
patent: 3187844 (1965-06-01), MacNair et al.
Ichiryu Ken
Murakami Yukio
Nakamura Ichiro
Takenoshita Mitsuaki
Yumino Hiroshi
Duncanson Jr. W. E.
Hitachi , Ltd.
Schaefer Robert K.
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