| 摘要 |
Window structure including a thermal break window frame and a sash coupler for selectively coupling movable window sash in inner and outer windows for movement together. The window frame includes an inner and outer frame portion and an insulating member which are constructed and arranged so that the insulating member is positioned between the inner and outer window frame portions with surface to surface contact therewith over a substantial area extending transversely of the plane of the window structure. The insulating member may be snapped, staked or crimped into assembly with the inner and outer frame portions and rigidly secures the inner and outer window frame portions together. The thickness of the insulating member may vary and it may be solid or hollow in accordance with rigidity and insulating requirements. The sash coupler is secured to a movable sash of the inner window and is formed to selectively engage a projection on a movable sash on the outer window.
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