Apparatus for ascertaining a cable motion for a hoist, in particular a pneumatically operated cable balancing hoist

US6641117B2 · kind B2 · utility

Assignee

• Demag Cranes & Components GmbH · DE

Inventors

• Jurgen Heun · Dortmund, DE
• Markus Lobel · Witten, DE
• Klaus Winter · Troy, US

Key dates

• Filing date: May 28, 2002
• Grant date: Nov 4, 2003
• Expiry date: May 28, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D3/26
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

Apparatus for slip-free determination of a cable motion in longitudinal cable direction for a hoist, in particular a pneumatically operated cable balancing hoist, which includes a housing, and a cable drum having an outer surface area formed with a groove for receiving a cable. The cable drum is rotatably supported in the housing and moveable in a longitudinal direction in such a way that a run-off point of the cable is at a same location at any time. A sensor is provided to detect markings of the cable drum, as the markings move relative to the sensor during rotation of the cable drum, for delivering an output signal. The groove defines a helical ridge in parallel relationship to the groove, wherein the markings are provided along the ridge, and wherein the sensor is secured to the housing in confronting relationship to the ridge.