Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1984-06-08
1985-08-27
Witkowski, Stanley J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
367 96, B66B 1324
Patent
active
045372870
ABSTRACT:
The present invention relates to an apparatus for detecting any abnormality in a cage of an elevator, characterized by comprising a transmitter which continuously transmits an ultrasonic wave inwardly of the cage of the elevator, a receiver which receives an ultrasonic wave retrogressing in such a manner that the ultrasonic wave transmitted from said transmitter is reflected by an object within the cage, and a processing circuit which detects the rate of movement of the object within the cage on the basis of a magnitude difference between frequencies of the ultrasonic waves of said transmitter and said receiver and which decides that an abnormality has occurred in the cage when the difference frequency has become at least a preset value.
REFERENCES:
patent: 3594768 (1971-07-01), Harris et al.
patent: 3793617 (1974-02-01), Tolman
patent: 4003045 (1977-01-01), Stockdale
patent: 4029176 (1977-06-01), Mills
patent: 4460066 (1984-07-01), Ohta
patent: 4482032 (1984-11-01), Enriquez et al.
Ando Hiroshi
Noda Masahiro
Duncanson Jr. W. E.
Mitsubishi Denki & Kabushiki Kaisha
Witkowski Stanley J.
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