Abstract: A roller-blind assembly comprises a plurality of roller blinds each windable about a respective shaft having a pair of ends. A plurality of mounting assemblies are provided some of which enclose mechanism for operating the blinds and some of which merely act as support bearings for the ends of the shaft. In addition these housings which are all identical are formed at their front and rear sides with slots in which are engageable flanges of adapters that can secure a continuous cover plate over a plurality of such housings to mask the roller blinds supported thereon. A plurality of axially aligned such housings may be secured via adjustable clamps to a ceiling-mounted rail that in turn is formed with a flange carrying the cover plate.