US Patent 10017363 Telescopic arm for self-propelled operating machines

The telescopic lift arm (1) for self-propelled operating machines (10), such a lifters, telehandlers and the like, comprises three tubular elements (21, 22, 23, 24, 25, 26), having a decreasing section and telescopically connected to one another to define a support structure which is able to move between a retracted configuration in which the tubular elements (21, 22, 23, 24, 25, 26) are inserted in one another, and an elongate configuration, in which two tubular elements are extracted.