| 摘要 |
A mullion for a window frame is formed by two frame members back to back to form the mullion. The facing surfaces are connected by providing aligned first and second recesses therein where each of the recesses has a mouth at the which is narrower than a base and has a connecting member along the aligned recesses with a portion of the connecting member within each recess as a loose fit. Each connecting member has associated with it an insert member with an insert portion between the outer surfaces of the first and second frame members forcing the outer surfaces apart to tighten the connecting member and a cover portion covering a junction between the side surfaces.
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