Mobile crane with a telescopic main boom

US7172082B2 · kind B2 · utility

Assignee

• Terex-Demag GmbH & Co. KG · DE

Inventors

• Michael Irsch · Lebach, DE
• Alexander Knecht · Zweibrücken, DE
• Jens Fery · Ensdorf, DE

Key dates

• Filing date: May 31, 2002
• Grant date: Feb 6, 2007
• Expiry date: Feb 3, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C23/828
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A mobile crane includes an under carriage, a superstructure that is rotatably mounted on the superstructure, and a main boom, which is composed of a base body and several telescopic lengths up to a predetermined maximum number, which slide into one another and can be extended from the base body. The main boom is mounted on the superstructure so that it can rotate about a horizontal axis and its inclination can be adjusted by means of a hydraulic tilting cylinder that is hinged on the superstructure and the base body. A maximum permissible weight is predefined for the main boom, as a result of a restriction on the permissible axle load of the mobile crane during road haulage. The crane is also provided with a lifting capacity increasing device, which significantly increases the lifting capacity of the main boom when the telescopic lengths are extended, in relation to the state without the lifting capacity increasing device. The lifting capacity increasing device, as part of the standard basic equipment of the mobile crane, is connected in a fixed manner to the main boom, while maintaining the maximum number of telescopic lengths that are carried.