原始名称记载: SOLETANCHE FREYSSINET

Telescopic device of a remote-operation arm, comprising an outer tube that is fixed relative to a mounting joint that forms the shoulder of the arm and defines a proximal end of the telescopic device, an intermediate tube and an inner tube provided at a distal end of the telescopic device with a tool-manipulator device, the intermediate tube sliding in the outer tube and the inner tube sliding in the intermediate tube, the telescopic device comprising a first electric motor secured to one end of the intermediate tube at the end corresponding to the proximal end, said motor being coupled to a drive pinion of a chain conveyor extending through the inner tube towards the distal end, said chain conveyor comprising an outbound portion and a return portion between said drive pinion and a follower pinion at the end corresponding to the distal end, said outbound portion travelling towards said distal end and the return portion travelling towards said proximal end as the telescopic device extends, and wherein the inner tube is secured via a first rod to the outbound portion near said motor while the outer tube is secured to the return portion at the end corresponding to the follower pinion via a second rod extending along the chain conveyor so that when the telescopic device is retracted, rotation of the first electric motor in the direction for extending the telescopic device pushes the outer tube and the inner tube in two opposite directions with respect to the central tube causing the telescopic device to extend, and so that, when the telescopic device has been extended, rotation of the first electric motor in a direction for retracting the telescopic device pulls the outer tube and the inner tube towards one another.