This 34.21 x 32.52 m extendable roof structure provides protection against sun and rain and allows the courtyard to be used for balls, concerts and other events. The entire membrane, cable and cross-girder construction is assembled on roller bearings in tracks. The travelling roof is operated by motors attached to the cross-girders, with pinions engaging in toothed racks welded to the edge beams. The cables and cross-girders are guided by combined radial and axial rollers, which also transmit all loads to the longitudinal beams.