Modified slowdown and braking of an elevator car

Details Modified slowdown and braking of an elevator car Modified slowdown and braking of an elevator car

1980-03-25

1983-07-26

Truhe, J. V.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318480, B66B 132

Patent

active

043948898

ABSTRACT:
In elevator systems where the stop and/or slowdown operations are preset for maximum car velocity the stopping and/or slowdown operations are delayed in proportion to the variation from maximum car velocity in order to compensate for the shorter stopping distance required when the car is moving slower than that maximum velocity. Motor speed is sensed within a revolution to provide a signal which manifests the motor speed. This signal is referenced to a second signal which reflects the motor speed for maximum car velocity. The difference between the two signals is a third signal which is used to control delay circuits which delay transmission of stop and/or slowdown signals to the brake and motor in a prescribed relationship to the magnitude of the difference between the two signals.

REFERENCES:
patent: 3898545 (1975-08-01), Coppa et al.
patent: 3946293 (1976-03-01), Feld
patent: 4061950 (1977-12-01), Kayanuma

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