Crane having a multi-section boom

US5082128A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Hermann Franzen · Rheydt, DE
• Walter Köllner · Korschenbroich, DE
• Dieter Klessinger · Düsseldorf, DE
• Joachim Kroll · Jüchen, DE

Key dates

• Filing date: Dec 19, 1989
• Grant date: Jan 21, 1992
• Expiry date: Dec 19, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C23/70
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

Cranes having multisection booms have an apparatus for interconnecting boom sections mounted at the ends of the boom sections. The apparatus for interconnecting the boom sections has: on a first boom section, an upper hook member with its concave portion being concave inwardly towards a central longitudinal axis of the boom section; on a second boom section, an upper fork member, having a pair of extending flange portions supporting a bolt member for being received within the upper hook member during interconnection; upper abutment surfaces, which are planar and are perpendicular to the central longitudinal axis of the boom sections, and which are located on the end of the upper hook member and between the pair of flanges of the upper fork member; and a lower strap member on a first boom section for being disposed within a lower fork member on a second boom section during interconnection.