Control system for limiting elevator car movement speed unless c

Details Control system for limiting elevator car movement speed unless c Control system for limiting elevator car movement speed unless c

1976-11-01

1978-07-18

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 506

Patent

active

041010078

ABSTRACT:
Safety controls for an elevator car in which a switch which is closed when the elevator car door is at least partly open is connected to a relay which interrupts the power to the motor of the car hoisting apparatus when the car speed exceeds a safe value. The switch and relay are connected in series to the hoisting apparatus motor armature, the voltage on which is proportional to the speed thereof and alternatively may be connected in series with a centrifugal switch driven by the hoisting apparatus motor. The relay may also actuate the motor brake and may be included in a lockup circuit which is manually resettable by an attendant.

REFERENCES:
patent: 1934867 (1933-11-01), Lindstrom et al.
patent: 1944471 (1934-01-01), Seeger
patent: 2867292 (1959-01-01), Bruns
patent: 3587785 (1971-06-01), Krauer et al.
patent: 3882969 (1975-05-01), Podcameni et al.

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