| 摘要 |
PROBLEM TO BE SOLVED: To prevent the oscillation of an intermediate coupling frame for an escape when a sash door of a folding double-sliding sash is folded. SOLUTION: Guide rollers 18 are installed at upper and lower ends of the intermediate coupling frame 17 which is installed between partition panels 15 of the sash doors 10, and engageably/disengageably engaged with guide rails 33b of a head 31 and a sill 32, so that a cremorne mechanism 22 can make the guide rollers 18 disengaged from the guide rails 33b and can make the sash door 10 foldable; a coil spring 27 is interposed between the cremorne mechanism 22 and a roller supporting block 28 for fixing the guide roller 18; and the guide rollers 18 are engaged with the guide rails 33b in an urged state, so as to prevent the oscillation of the coupling frame 17.
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