| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-hung window being high in fireproof performance in a bottom rail part of an inner sash.SOLUTION: The double-hung window comprises a frame body and the inner sash, and the frame body comprises a lower frame and a vertical frame, and forms a guide groove on the inner peripheral side of the vertical frame, and the inner sash vertically freely moves along the guide groove of the vertical frame, and comprises a bottom rail and a stile, and the stile is installed on the left-right ends of the bottom rail, and a tight material holder is erected on the indoor side of the lower frame, and a tight material installed in the tight material holder abuts on an indoor side part of the bottom rail in an inner sash-closed state, and the bottom rail comprises an edge material, and the edge material comprises a suspending piece opposed to an outdoor side surface of the tight material holder of the lower frame in the inner sash-closed state, and the left-right ends are swallowed in the guide groove of the vertical frame. |
