Backup position signaling in an elevator

Details Backup position signaling in an elevator Backup position signaling in an elevator

1985-04-25

1986-12-09

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

340 21, B66B 302

Patent

active

046275185

ABSTRACT:
An elevator has a car position transducer that provides an output signal indicating car location. A car controller causes that signal to be stored in a memory. The controller compares the stored signal with a current transducer output and stores the current signal when the difference between the two exceeds a preset amount. A detector senses the elevator system power level and connects a backup power supply to the memory and the transducer when there is a power loss. A car motion detector senses the transducer output and removes the backup power from the transducer when the car stops moving.

REFERENCES:
patent: 4124103 (1978-11-01), Otto et al.
patent: 4142609 (1979-03-01), Tachino
patent: 4368518 (1983-01-01), Terazono et al.

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