| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-hung window excellent in operability during upward movement of a sash.SOLUTION: A double-hung window includes: a sash which is provided in a vertically movable manner; a frame body which is provided with a groove part for housing a horizontal end of the sash and which guides movement of the sash; and an elastically-deformable elastic protrusion which is protruded from one of mutually-opposed parts of the groove part and the end housed in the groove part, in such a manner that the side of the end is positioned higher than the side of the groove, and which is brought into contact with the other one of the opposed parts. |
