Opposed-rope hoist driven telescoping mast

US7624967B1 · kind B1 · utility

Assignee

• PAR SYSTEMS, LLC · US

Inventors

• Gary R. Doebler · Elk River, US
• Thomas Jung · Aschbach, DE
• Albert J. Sturm, Jr. · Bocholt, DE

Key dates

• Filing date: Apr 19, 2007
• Grant date: Dec 1, 2009
• Expiry date: Apr 16, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D1/50
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An opposed-rope driven telescoping mast assembly includes a stationary support and a longitudinal mast comprising a longitudinal section joined to move relative to the stationary support. A drive assembly drives the longitudinal mast and includes a frame and a rotatable drum assembly mounted to the frame. A first rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a first direction, while a second rope is joined to the drum assembly and to the longitudinal mast to pull the longitudinal section in a second direction. A sensor is operably coupled to the drive assembly to sense overload tension in the first rope or the second rope.