| 摘要 |
The plastic back-up shear plate is laterally disposed with a spring fit into the outwardly facing mouth of a metal window frame. The mouth is defined by the window frame. The shear plate has laterally disposed opposite outer edge portions which are interlockable on corresponding outer wall elements of hollow body metal window frame. In a perpendicular direction, the back-up shear plate has opposing edge portions which interlock on window frame mouths having a slightly different dimension. 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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