Positively guided folding bow

The roof apparatus comprises a rear tailgate that is equipped on a sideboard wall (16-2), which has a limited cargo space. An actuating device is mounted on a load transportation container (10). The actuating devices (32-1,32-2,82) are positioned between an outstretched covering position and a shirred retracted position of the load transportation containers. A support bracket ( 24-1) is used for the top plane of the load transportation container. A guide element (26) is equipped at the upper edges of the sideboard walls. The stop units (100,102) are connected to the rear tailgate.