Telescopic boom for cranes

US6516962B1 · kind B1 · utility

Assignee

• Atecs Mannesmann AG · DE

Inventors

• Michael Irsch · Lebach, DE
• Jens Fery · Ensdorf, DE

Key dates

• Filing date: Oct 6, 2000
• Grant date: Feb 11, 2003
• Expiry date: Dec 8, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2998/00
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A telescopic boom for crane, in particular mobile cranes, includes a base section and a plurality of boom sections received in the base section and telescopically extendible and retractable. The base section and the boom sections are each made of a profile comprised of an upper shell and a lower shell which are joined together at their confronting walls, with the upper shell having a nominal wall thickness which is equal or smaller than a nominal wall thickness of the lower shell. At least one portion of the upper and lower shells includes, as viewed in cross section, two outer thin metal sheets which are placed in spaced-apart relationship to define an intermediate space therebetween.