Positive terminal overspeed protection by rail grabbing

US5301773A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Eric K. Jamieson · Farmington, US
• Young S. Yoo · Avon, US
• Rudi Steger · Town of West Hartford, US
• Richard C. McCarthy · Simsbury, US

Key dates

• Filing date: Oct 23, 1992
• Grant date: Apr 12, 1994
• Expiry date: Oct 23, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B5/22
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A permanent magnet 54 mounted on rods 41 passes vertically over a conductive plate 56 in an elevator hoistway 36, a reactive force causes movement of the permanent magnet 54 vertically away from the conductive plate 56 so that a wedge 24 secured to the rods 41 moves within a tapered wedge guide 44 until it contacts an elevator guide rail 14 on which an elevator car 2 is riding, thereby braking the elevator car 2.