Lifting devices for containers

Arrangement in a lifting system for a container, including four lifting columns, each adapted for being removably connected to one of the four vertical corner edges of the container, each lifting column being telescopable with the aid of a power means, driven by a power source under the actuation of a control means with controls, said lifting columns being in pairs, respectively, included in two separate lifting aggregates placed at opposite sides of the container, and the power means for said pairs of columns being arranged and interconnected such that they achieve a simultaneous displacement of the two pairs of lifting columns of the/each lifting aggregate, the improvement wherein:

• each lifting aggregate comprises a closed loop circulation circuit, including in order, a connecting piping (7;8) from the controls (20';20") of the control means (19) to the first lifting column (10;12) of a pair of lifting columns, a first interconnection (14;16) from the first lifting column (10;12) to the second lifting column (11;13) of a lifting aggregate and a second interconnection (15;17) from said second lifting column (11;13) back to the control means (19), thereby defining a first closed loop (20"-7-10-14-11-15-20") at one side of the container (1) completely separated from a second closed loop (20'-8-12-16-13-17-20') at the other side of the container for effecting synchronous and equal displacement of said lifting column pairs for each of said two separate lifting aggregates.