Elevator system without a moving counterweight

US7878306B2 · kind B2 · utility

Assignee

• OTIS ELEVATOR COMPANY · US

Inventors

• Bryan Robert Siewert · Westbrook, US
• Mark S. Thompson · Tolland, US
• Richard L. Hollowell · Town of West Hartford, US

Key dates

• Filing date: May 25, 2007
• Grant date: Feb 1, 2011
• Expiry date: Dec 10, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66B19/00
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An elevator system includes a cab supported for movement within a hoistway. A tension device, which remains close to one end of the hoistway, maintains a desired tension on a load bearing member that supports the cab and moves to achieve a desired placement of the cab. The load bearing member extends from a first end of the hoistway toward the cab, wraps around a first sheave supported on the cab, extends toward the first end of the hoistway, wraps around a second sheave supported near the first end of the hoistway, extends toward a second end of the hoistway, wraps about a third sheave supported near the second end of the hoistway, extends toward the cab, wraps around a fourth sheave supported on the cab, and extends toward the second end of the hoistway where it is secured to the tension device.