Device for limiting the upper rotation speed of a balancing hoist

US6578822B2 · kind B2 · utility

Assignee

• Demag Cranes & Components GmbH · DE

Inventors

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

Key dates

• Filing date: Mar 13, 2001
• Grant date: Jun 17, 2003
• Expiry date: Jun 24, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66D5/04
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A balancing hoist, includes a housing having a chamber accessible from outside. Received in the housing is a piston which is movable by gas pressure in a longitudinal direction and rotates a threaded spindle which projects into the chamber of the housing and carries a nut that securely fixed to the housing. Mounted in fixed rotative engagement to the spindle and movable longitudinally along the spindle is a cable drum on which a load-carrying cable is wound. At least one pawl is provided and configured for rotation in opposition to an elastic restraining force from a radially inward idle position to a radially outward brake position as a result of centrifugal forces, when a rotation speed of the cable drum exceeds a predetermined level, thereby impacting upon a fixed stopper which projects radially inwardly from the housing and slowing down the rotation of the cable drum until it is at rest.