Blocked door detection for an elevator system

US5841083A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Uwe Schonauer · Berlin, DE
• Helmut Schroder-Brumloop · Ville-d'Avray, FR

Key dates

• Filing date: Dec 18, 1996
• Grant date: Nov 24, 1998
• Expiry date: Dec 18, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B13/143
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A method for detecting if an elevator door is blocked comprises the steps of: initiating a movement of the elevator door; starting a timer count upon the initiation of the movement of the door; determining if the timer count has expired before a door position reference switch is actuated; and determining that the elevator door is blocked if the timer count has expired before the door position reference switch is actuated.