Device for stopping passenger conveyor

Details Device for stopping passenger conveyor Device for stopping passenger conveyor

1977-03-23

1979-02-13

Smith, Jr., David

Electricity: motive power systems

Braking

Friction braking

318270, 318364, H01H 4704

Patent

active

041398106

ABSTRACT:
The present invention is a device for stopping a passenger conveyor.
A stop pushbutton is depressed to deenergize a driving motor for an escalator and an operating winding for an electromagnetic brake. The electromagnetic brake has a mechanical braking means whose operations is opposed by the magnetic force of the operating winding. Then two timing relays are energized and also the brake operating winding is reenergized through a variable resistor to brake the motor with a low braking force. The timing relays are successively picked up after predetermined time intervals to increase the resistance of the resistor to increase the braking force stepwise by decreasing the current and hence the magnetic force of the operating winding. When the escalator reaches a predetermined low speed, the brake operating winding is again deenergized to apply the rated braking force to the motor until the escalator is stopped.

REFERENCES:
patent: 2666176 (1954-01-01), Fath
patent: 2712365 (1955-07-01), Burns
patent: 3130358 (1964-04-01), Lang
patent: 3794897 (1974-02-01), Bradley
patent: 3902635 (1959-09-01), Kuka

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