Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1978-12-18
1981-03-17
Truhe, J. V.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
B66B 140
Patent
active
042562031
ABSTRACT:
A first memory contains the location of each floor in the elevator shaft. A second memory stores a distance correction for each floor. The sum of the stored correction and the stored location is compared with the actual car location in the shaft to position the car at a floor. Each time the car door opens, after a delay, the leveling distance is sensed and if the car is below a preselected level zone one unit of correction equal to a preselected distance is added to the stored correction. The resulting new correction is stored in the second memory. On a successive stop at the same floor the car will position that preselected distance closer to the level zone until it is above the zone, when a unit of correction is subtracted from the stored correction. In this fashion the car clusters around the level zone.
REFERENCES:
patent: 3458014 (1969-07-01), Yeakley
patent: 3773146 (1973-11-01), Dixon, Jr. et al.
patent: 4134476 (1979-01-01), Zolnerovich, Jr. et al.
patent: 4141435 (1979-02-01), Satoh
Duncanson Jr. W. E.
Greenstien Robert E.
Otis Elevator Company
Truhe J. V.
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