Elevator controller

Details Elevator controller Elevator controller

1988-08-17

1990-12-25

Skaggs, H. Grant

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187130, 187139, 104112, 104295, B66B 906

Patent

active

049795937

ABSTRACT:
In an elevator system comprising a machine room and an elevator car, as the elevator car moves along a hoistway between a plurality of floors, a radio system permits wireless communication between the machine room and the elevator car. As the elevator car moves along the hoistway, the distance between the elevator car and the machine room varies. To effect stable signal transmission and avoid receiver saturation when the elevator car is in close proximity to the machine room, the output of the transmitter or the sensitivity of the receiver is varied in accordance with the distance between the elevator car and the machine room.

REFERENCES:
patent: 2505144 (1950-04-01), Rutherford
patent: 2602524 (1952-07-01), Shirley
patent: 3203506 (1965-08-01), Cummins
patent: 3686447 (1972-08-01), Takalo
patent: 4163480 (1979-08-01), Highland
patent: 4471356 (1984-09-01), Gidl
patent: 4567334 (1986-01-01), Wilcox
patent: 4623869 (1986-11-01), Marubashi
patent: 4768740 (1988-09-01), Corrie
Spahn, "Die Elektrische Ausrustung der Schnellaufzuge im Fernsehturm Moskau", AEG-Mitteilungen 57 (1967) 5.

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