from floor 7 to a lintel 9 the panels are arranged to be moved vertically by the action of a driven shaft 11 turning a drum 12 to draw a cable 14 attached to a lifting bracket not visible fixed to the lowermost panel 1 the arrangement of the drive means cable and lifting bracket is substantially as depicted in my earlier u s pat no 3 757 845 panel 1 has fixed to the end thereof a bracket 26 in which roller 27 is journaled by a simple axle panels 2 and 4 have fixed to the ends thereof respective first roller brackets 30 35 in which first rollers 32 37 are journaled rollers 27 32 and 37 all ride in a vertical first trackway 18 fixed to jamb 10 the panels 2 and 4 also have second roller brackets 40 45 fixed to their respective ends the brackets 40 45 carry respective second rollers 42 47 in spring biased fashion as disclosed in u s pat no 3 757 845 the rollers 42 47 ride in a second trackway 21 which is fixed relative to jamb 10 the second trackway 21 includes a vertical lower portion 22 which parallels the first trackway 18 and an upper portion 23 which diverges therefrom a bracket 25 is fixed between the upper end of portion 23 and the lintel 10 the rollers 42 47 are situated in the lower portion 22 when the panels are coplanar as shown note that while only one end or vertical side of the doorway or opening 6 is shown in the figures the apparatus on the opposite end is substantially the mirror image while only one end of the doorway is shown and described it will be understood that similar structure and operation appears.