| 摘要 |
The plastic back-up shear plate is laterally disposed with generally a spring fit into the outwardly facing mouth of a metal window frame. The outwardly facing frame mouth is formed and defined by the window frame elongated hollow body and particularly by outer wall elements which face each other in an opposing manner. The plastic back-up shear plate has laterally disposed opposite outer edge portions which are interlockable on corresponding outer wall elements of hollow body metal window frame which wall elements define the mouth of the window frame. In a perpendicular direction, the back-up shear plate has a opposing edge portions with interlock on window frame mouths having a slightly different dimension. The plastic back-up shear plate lateral lips to lock onto lateral frame mouths having different dimensions for different sized frames. The shear plate is constructed and arranged to fit, with appropriate change in orientation, window frames of two different mouth openings. Multiple window frame mouths, on different window frames, are accommodated by a multiple sided back-up plate.
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