Abstract: A load crane main boom of the telescopic type having cylinder-piston groups located inside the main boom tubular sections with reduced dimensions. The load crane main boom minimizes the main boom section thanks to a particular arrangement of the cylinder-piston groups. Each cylinder of each piston-cylinder group is connected to a respective boom section through at least one reinforcing rod extending perpendicular to the main boom axial direction and connected to respective section walls of the main boom. At least first and the second cylinder-piston group rods are further supported by a respective reinforcing plate, which is in turn connected to the respective boom section.

Abstract: A load crane (1) main boom (3) comprises: a fixed tubular first boom section (4I), a tubular second boom section (4II) telescopically arranged and movable relative to the first fixed boom section (4I) between a retracted position and an extended position, and at least a tubular third boom section (4III) telescopically arranged and movable relative to the movable second boom section (4II) between a retracted position and an extended position; a hydraulic system (6) comprising: a first cylinder-piston group (7I) axially extending within the main boom (3), integrally connected with the fixed first boom section (4I) and connected to the movable second boom section (4II) so to move the latter relative to the fixed first boom section (4I) under the action of a pressurized working fluid; a second cylinder-piston group (7II) axially extending within the main boom (3), integrally connected with the movable second boom section (4II) and connected to the movable third boom section (4III) so to move the latter relative

Abstract: A device for remotely commanding a crane comprises a transmission unit suitable for establishing a communication between the device and a control unit of the crane. The device also includes control panel comprising a plurality of manual control members, each arranged for commanding a specific movement of a plurality of available movements of the crane and the direction of the specific movement. The device may also include a plurality of indicators of the available movements of the crane, each correlated with the specific crane movement commandable by a respective manual control member.

Abstract: A device for remotely commanding a crane comprises a transmission unit suitable for establishing a communication between the device and a control unit of the crane. The device also includes a control panel comprising a plurality of manual control members, each arranged for commanding a specific movement of a plurality of available movements of the crane and the direction of the specific movement.

Abstract: It is described an electronic system for the remote maintenance of a crane.