Screening device for a wall opening

A screening device for covering an opening of substantially rectangular configuration in a wall of a building, comprising a frame structure composed of an elongate base member accommodating a screening member in a first position in which it assumes a stored condition, two side members each having one end pivotally connected with one of two opposite ends of said base member, and a bar member of a length substantially equal to the length of said base member forming a fourth side of said frame structure, the frame structure having an erected condition in which the side members project at substantially right angles from the base members, said bar member in said erected condition being spaced from a free edge of said screening member when said screening memer is in said stored condition, the connections between said base member, side members and bar member forming at least one pair of pivotal links, whereby to make the frame structure collapsible from said erected condition into a collapsed condition in which the side members are folded into overlying relationship with the base member, said screening member and each of said side members being provided with cooperating guide means for guiding said screening device in said erected condition during movement thereof from said first position towards a second extracted position in which it screens said opening.