Differential reflectometery for position reference in an elevato

Details Differential reflectometery for position reference in an elevato Differential reflectometery for position reference in an elevato

1996-11-19

1998-07-21

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

Monitors operational parameter

187282, B66B 134

Patent

active

057837848

ABSTRACT:
An apparatus for determining if an elevator car is level with respect to a landing in a hoistway comprises a transceiver for transmitting a signal, a first reflector having a varying reflectance between a maximum reflectance end and a minimum reflectance end, a second reflector having a varying reflectance between a maximum reflectance end and a minimum reflectance end, and a processor. The first reflector transmits a first reflected signal in response to the signal transmitted by the transceiver and the second reflector transmits a second reflected signal in response to the signal transmitted by the transceiver. The first reflector and the second reflector are adjacently aligned such that the maximum reflectance end of the first reflector is adjacent to the minimum reflectance end of the second reflector, and the minimum reflectance end of the first reflector is adjacent to the maximum reflectance end of the second reflector. The processor determines if the elevator car is level with respect to the landing in response to the first and second reflected signals.

REFERENCES:
patent: 3486640 (1969-12-01), Lemelson
patent: 4019606 (1977-04-01), Caputo et al.
patent: 4134476 (1979-01-01), Zolnerovich, Jr. et al.
patent: 4991693 (1991-02-01), Stern et al.
patent: 5509505 (1996-04-01), Steger et al.
patent: 5682024 (1997-10-01), Koopman, Jr. et al.

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