(57) A protective screen device for a pivotally opening window assembly (1), which device
includes a first, substantially rectangular perimeter frame (15) that extends through
at least three adjoining sides of a rectangle. The screen device also includes a second,
substantially rectangular perimeter frame (17) that extends through at least three
adjoining sides of a rectangle and a collapsible protective screen (11) connected
for expansion between the fist and second perimeter frames (15, 17). The first and
second perimeter frames (15, 17) are movable with respect to one another between a
first position in which a plane through the second perimeter frame is substantially
coextensive with a plane through the first perimeter frame and a second position in
which the planes of the first and second perimeter frames are substantially spaced.
Means (27) are provided for resiliently urging the first and second perimeter frames
(15, 17) away from one another.
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