| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost by lessening the number of component part items of a duel sash having the external sash composed of a single sliding type as well as making ventilation property and operability excellent in addition to airtightness and sound insulation property. SOLUTION: An internal sash is composed of a single sash 16 of an inner lifting type, the glass in the sash 16 is divided into the right and left with one of them having a glass portion 17a fixed and the other glass portion 17b movable, the sash 16 is made openable and closable by the movement of the glass portion 17b, and the internal sash has the vertical box on both sides colliding against a step 28a on both sides of an architrave 28 through a gasket 29.
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