Harley Cozad

US Patent:

44898380, Dec 25, 1984

Filed:

Aug 17, 1981

Appl. No.:

6/293727

Inventors:

Harley R. Cozad - Cedar Rapids IA

Assignee:

FMC Corporation - Chicago IL

International Classification:

B66C 2304
B66C 700
B66C 2356

US Classification:

212264

Abstract:

A telescopic boom is disclosed which is pivotally supported by its base section for movement about a horizontal axis. The boom is supported by a live mast through multi-part pendant lines, which pendant lines are each reeved over sheaves attached to the boom at the forward end of the base section and at the forward end of another boom section to support the boom at a plurality of points forwardly of the live mast. The forward end of each pendant is preferably received within the boom over sheaves journaled on the cylinder case of a boom extending ram and on selected sections of the boom. The multi-part pendant supported boom reduces boom droop caused by extension of the boom approximately 50% of that of a boom supported at a single point by each pendant line.