| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage device preventing rainwater from infiltrating from a drain port even if a drain plate is opened by external force in the case of external force being applied to the drainage device in strong wind and rain and suppressing the sound volume of sound generated in the opening/closing action of the drain plate. SOLUTION: In a double sliding sash with an inner sash and an outer sash fitted in this order from the indoor side, an opening part is provided between an outer rail and an inner rail of a lower frame, and a drain block 9 composed of a drain plate 902 and a fitting part is fittingly fixed into the opening part to constitute a drainage device for the sash. In this case, an open quantity regulating means is provided at an intermediate part of the fully opening process of the drain plate 902 of the drain block 9.
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