Elevator cord health monitoring

US9809421B2 · kind B2 · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Fanping Sun · Glastonbury, US
• Xiaodong Luo · Hsinchu, TW
• Daniel A. Mosher · Glastonbury, US
• Huan Zhang · 安丰镇, CN
• John P. Wesson · Vernon, US
• Yan Chen · South Windsor, US
• Mark S. Thompson · Tolland, US
• Raja Kountanya · Manchester, US
• Richard N. Fargo · Plainville, US

Key dates

• Filing date: Feb 21, 2013
• Grant date: Nov 7, 2017
• Expiry date: Feb 21, 2033

Classification

• Technology area (CPC —): General

Abstract

A method of fault detection of a belt or rope includes interconnecting a plurality of cords of the belt or rope, the cords including a plurality of wires, to form a bridge circuit. A fault detection bridge circuit is subjected to a voltage excitation and outputs a voltage which is indicative of the belt or rope damage but remaining insensitive to other environmental noises.