Device for selectively controlling the simultaneous or synchronised telescopic movement of two constituent elements of a telescopic jib for a crane

摘要

- Crane with telescopic jib - The device is characterised in that the locking means (30) comprises: on the reference element (10) . a drive unit (31) . and a mobile lock (32) controlled by the said unit and including a head (46) for locking onto the endless chain (20) . a shoe (50) defining a lug capable of accommodating the locking head of the bolt and an installation for remotely controlling the drive unit. - Application to self-propelled mobile cranes. <IMAGE>