Elevator leveling signal error and correction

US4520904A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• David Rado · Granby, US
• Steven D. Coste · Berlin, US

Key dates

• Filing date: Nov 9, 1983
• Grant date: Jun 4, 1985
• Expiry date: Nov 9, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B1/405
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

In an elevator that has a position indicator that indicates through separate indication signals if the car is above, at, or below floor level, the position indicator is checked prior to and during the approach to the floor for a stop, and if an incorrect indication is sensed, the error is stored. The stored error and the other indications are used during the approach to slow and stop the car and open the doors.