Safety brake

US5819879A · kind A · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Michael C. Lang · Southbury, US
• Dat Nguyen · Town of West Hartford, US
• Samuel C. Wan · Simsbury, US
• Richard J. Ericson · Southington, US
• Paul Bennett · Waterbury, US
• Joseph A. L. LeDoux · Plantsville, US
• Fred J. Lussier · Hebron, US
• Philip H. McCluskey · Manchester, US
• David Wayne Mckee · Somers, US
• James T. Beals · Town of West Hartford, US
• Mark S. Thompson · Tolland, US
• Anthony Cooney · Unionville, US

Key dates

• Filing date: Nov 6, 1997
• Grant date: Oct 13, 1998
• Expiry date: Nov 6, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B5/18
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An elevator safety brake is provided comprising two cantilevers, a pivot, a spring, and a hold-off-engagement linkage. In one embodiment, the hold-off-engagement linkage is comprised of two upper struts, and two lower struts. When it is desired to slow or stop the elevator via the safety brake, the lower struts move from a first position in which the lower struts are substantially in alignment with one another and the cantilevers are in an open position, to a second position in which the lower struts are not substantially in alignment with one another and the cantilevers are in a closed position. When the cantilevers are in the closed position, the spring exerts a force via the cantilevers on the guide rail in order to decelerate the elevator.