| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-hung window capable of keeping a balance between weight of a movable screen and itself, and capable of reducing the depth size and aspect size of a frame.SOLUTION: In a double-hung window 1, a barrel 20, a drum 30 and a connection gear 41 are mounted on a base 12, and the rotational center C1 of the barrel 20 is positioned above the rotational center C2 of the connection gear 41, and a gear 21 of a diameter D1 smaller than a diameter M of the barrel is provided in the barrel 20 while having the same rotational center C1. The rotational center C3 of the drum 30 is positioned under the rotational center C2 of the connection gear 41, and a gear 31 of a diameter D3 smaller than a diameter N of the drum is provided in the drum 30 while having the same rotational center C3. The connection gear 41 is positioned on the base side of the barrel 20 and the drum 30, and meshes with the gear 21 of the barrel 20 and the gear 31 of the drum 30. The respective rotational centers C1, C2 and C3 of the gear 21 of the barrel 20, the gear 31 of the drum 30 and the connection gear 41, are positioned on the same straight line.SELECTED DRAWING: Figure 1 |
