| 摘要 |
<p>The telescopic arm (1) for operating machines includes an outer arm (2), four coaxial slip-off elements, first (10), second (20), third (30), fourth (40) and an operative head (3) associated to the latter. The telescopic arm (1) includes: a drive system (100), supported partially outside of the telescopic arm (1), for moving synchronously said slip-off members (10), (20), (30), (40) in their extending and returning travels; a hydraulic circuit (200), housed inside said telescopic arm (1), comprising a first and a second group of hydraulic conduits (210), (220), which include, respectively, first and second flexible pipes (211), (221), kept stretched during the returning step of said slip-off members (10), (20), (30), (40) by the corresponding idler pulleys (212), (222) supported by the latter.</p> |
