Telescopic arm for self-propelled operating machines

A telescopic lifting arm (1) for self-propelled operating machines (10) such as lifters and telehandlers, comprising at least three four tubular elements (21, 22, 23, 24, 25, 26) with decreasing transverse cross sections and telescopically connected to one another, so as to define a support structure able to move between a retracted configuration, wherein said tubular elements (21, 22, 23, 24, 25, 26) are telescopically inserted into one another, and an elongated configuration, wherein at least two of said tubular elements are at least partially extracted, characterized in that the arm (1) comprises a hydraulic actuator (4) associated with said support structure (21, 22, 23, 24, 25, 26) and provided with at least three hydraulic elements (41, 42, 43) being telescopically connected to one another, each of said hydraulic elements (41, 42, 43) being connected to a respective one of said tubular elements of the support structure, the telescopic lifting arm further comprising a motion transmission organ (3) connecting at least two of said tubular elements and comprising one or more flexible elements and one or more pulleys whereon one of said tubular or flexible elements slides, said organ (3) being able to produce an extension or retraction of at least one of said tubular elements with respect to another one of said tubular elements.