| 摘要 |
An improved screen device (21) is adapted for use in a window assembly (1). A pane-carrying sash (5) is hinged, at least selectively, along one of its sides (9) to a casement frame (3) to define in its open position a wedge-shaped three-sided ventilation opening. The improved screen device (21) is adapted to cover the wedge-shaped three-sided ventilation opening (23, 25, 27) and to prevent ingress of foreign matter while allowing ventilation. The screen device (21) includes an extendible and collapsible pleated screening member formed substantially of pre-pleated sheet material (51) that is brought into a three-dimensional configuration separately and after pre-pleating. Also included is a method of making a three sided pleated screening member (29, 31, 33) for use in the screen device (21).
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