Means for controlling the light entering a room window

Claim 1

A PREFABRICATED STRUCTURE FOR CONTROLLING THE LIGHT PASSING THROUGH A LARGE WALL OPENING OF A ROOM, COMPRISING: A RECTANGULAR FRAME CONSTRUCTED TO FIT IN SAID WALL OPENING, SAID FRAME INCLUDING A PAIR OF STATIONARY SPACED APART VERTICAL MEMBERS THE CENTERS OF WHOSE ADJACENT FACES ARE PROVIDED WITH ALIGNED GROOVES OF SUBSTANTIAL DEPTH; A PAIR OF OPAQUE CLOSED CASINGS DISPOSED AT THE OPPOSITE ENDS OF SAID VERTICAL MEMBERS AND CONNECTED THERETO, SAID CASINGS HAVING A PAIR OF LONG ALINGED NARROW OPENINGS THEREIN IN ALIGNMENT WITH SAID GROOVES; A FIRST ROLLER PIVOTALLY SUPPORTED WITHIN ONE OF SAID CASINGS; A SECOND ROLLER PARALLEL TO SAID FIRST ROLLER AND PIVOTALLY SUPPORTED WITHIN THE OTHER CASING; A LONG THIN SHEET OF FLEXIBLE PLASTIC PASSING THROUGH SAID NARROW OPENINGS AND HAVING ITS ENDS WOUND AROUND SAID ROLLERS, THE EDGES OF SAID SHEET EXTENDING INTO SAID GROOVES, SAID SHEET COMPRISING A PLURALITY OF RECTANGULAR PANELS OF DIFFERENT COLORS, THE LENGTH OF EACH PANEL BEING LONGER THEN THE DISTANCE BETWEEN SAID OPAQUE CASINGS AND EACH PANEL HAVING AN AREA OF AT LEAST 6 SQUARE FEET; AND GEARING DISPOSED ENTIRELY WITHIN ONE OF SAID CASINGS FOR ROTATING ONE OF SAID ROLLERS.