Abstract: The present invention relates to an apparatus in large open goods carriers, so called container-flats, which display a loading plane (1) and at least one wall unit (2, 3), for example an end wall unit, which is fixedly retained in the loading plane for pivotal switching from a rest position, in which the wall unit (2, 3) is located in or parallel with the loading plane (1), and a working position, in which the wall unit (2, 3) makes substantially a right angle with the loading plane (1).The anchorage of the wall unit (2, 3) consists of a hinge means with a shaft in or on which one end of at least one torsion bar (20, 21) is disposed in a non-rotary manner, the torsion bar extending longitudinally with the pivotal shaft (18) of the pivotal wall unit (2, 3), the other end of the torsion bar (20, 21) being disposed in a non-rotary manner in the loading plane (1), and that the torsion bar (20, 21) is tension-free in a position on the wall unit (2, 3) between its rest position and working position.