| 摘要 |
PROBLEM TO BE SOLVED: To provide a fitting that prevents ignition of resin components.SOLUTION: A double-hung window 1 includes a window frame 10, an upper sash 20 and a lower sash 30. The lower sash 30 includes an upper frame member 31 comprising an aluminum body part with an engaging part and a resin cover part, a resin upper sliding member 36 fitted by engaging the engaged part with the engaging part of the upper frame member 31, and a heating foam material 37 disposed in a vicinity of the upper sliding member 36. The upper sliding member 36 may be disengaged from the engaging part of the upper frame member 31, by being pressed by the heating foam material 37 when the heating foam material 37 foams by heating. |
