Control apparatus for elevator doors using velocity limiting cir

Details Control apparatus for elevator doors using velocity limiting cir Control apparatus for elevator doors using velocity limiting cir

1991-05-28

1992-09-01

Williams, Howard L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 1314

Patent

active

051441012

ABSTRACT:
An apparatus for controlling elevator doors where door operation velocity is calculated based on the rotational velocity of the door driving motor. An abnormality detection circuit is provided to alert an elevator supervisor when the calculated door operation velocity exceeds a predetermined value. A velocity limiting circuit is provided to decelerate the doors when the door operation velocity exceeds the predetermined value.

REFERENCES:
patent: 3814214 (1974-06-01), Booker, Jr.
patent: 4300663 (1981-11-01), Hmelovsky et al.
patent: 4982816 (1991-01-01), Doi et al.
patent: 4989174 (1991-01-01), Yasunobu et al.

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