Reversible suspended wall or projection board

A wall or projection board 5 which is suspended from a horizontal rail 1 by means of rollers 25,25' includes a vertical pivot spindle 35 which enables the board to be pivoted through 180{ on disengagement of one of the rollers 25 from the rail. After the board has been reversed the roller 25 can be engaged in the rail on the other side in relation to the other roller 25'.