Telescopic crane boom section and a process for making sure

US6098824A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Thomas Krebs · Doorwerth, NL
• Michael Irsch · Lebach, DE
• Karl-Heinz Rube · Zweibrücken, DE

Key dates

• Filing date: Mar 12, 1998
• Grant date: Aug 8, 2000
• Expiry date: Mar 12, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C23/701
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A telescopic boom section for a mobile crane including an upper inverted U-shaped longitudinal section and a lower convexo-concave longitudinal section. The upper section and the lower section are welded to each other along the seams formed by the longitudinal edges of the upper and the lower sections such that the concave surface of the lower section and the U-shaped wall of the upper section defines a cavity therewithin. The lower section includes a plurality of arcuate segments disposed sequentially across the concave surface and which are formed by a cold roll die.