| 摘要 |
A thermal break window including a rectangular outer frame portion, a rectangular inner frame portion and an insulating member positioned between the inner and outer frame portions and cooperable therewith for rigidly securing the frame portions together into a prime window frame without contact between the inner and outer frame portions. The window structure further includes an inner window sash and an outer window sash slidably positioned in the prime window frame and a sash coupler extending between the inner and outer window sash for automatically connecting the window sash together for movement together on relative movement of the sash in one direction to place the movable sash in predetermined alignment, which sash coupler is manually disengageable to permit relative movement of the movable sash in the opposite direction out of the predetermined alignment.
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