Measuring elevator car position using ultrasound

Details Measuring elevator car position using ultrasound Measuring elevator car position using ultrasound

1991-06-03

1993-06-29

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187136, 367117, 367127, B66B 302, G01S 380

Patent

active

052236803

ABSTRACT:
Two ultrasonic transducers are provided, one upon the ceiling of an elevator hoistway and the other one the top of an elevator car for measuring the time for an ultrasonic signal to travel from one transducer to another and return for treasuring elevator position.

REFERENCES:
patent: Re30719 (1981-08-01), Mills
patent: 3098992 (1963-07-01), Rath
patent: 4023135 (1977-05-01), Hanmura et al.
patent: 4254478 (1981-03-01), Dumas
patent: 4537287 (1985-08-01), Noda et al.
patent: 4894810 (1990-01-01), Jukkala
patent: 4910464 (1990-03-01), Trett et al.

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