Burton Greenfield

US Patent:

53130260, May 17, 1994

Filed:

Jul 11, 1991

Appl. No.:

7/728669

Inventors:

Jean Youla - Brooklyn NY
Monique M. LaRose - Berlin MA
William P. Reid - Windsor CT
Burton Greenfield - Avon CT

Assignee:

Otis Elevator Company - Farmington CT

International Classification:

B66B 302

US Classification:

187134

Abstract:

An electronic stepper for indicating floor position has initialization switches set by a serviceman for indicating a reference floor position. Whenever the car goes by the reference position in the hoistway, the corresponding reference floor is output. The electronic stepper may be mounted on a printed circuit board having a floor display for use by the serviceman. Various toggle switches may be provided for use by the serviceman in setting up and checking operation. Power checking means may be provided for initiating nonvolatile storage of the current floor position in the event of a brown-out or other power failure. Watchdog circuitry may be provided for checking on the health of the signal processor and a circuit for watching the watchdog may also be provided. A timed window signal may also be provided for indicating the end of the time at which a stopping sequence must be initiated in order to be able to stop at the approaching floor.