| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilator for greenhouse, which can prevent gap formation by uniformly and completely shut a window frame facing an opening, allows the opening to be opened or closed at a right position without being affected by wind, is durable and applicable to a large-size greenhouse, and when used in communication with a sheet opening/closing device which utilizes pipe(s), can hold the bundle of the wound sheet to prevent the bundle from being hit by rain or dirt and also prevent evolution of mold. SOLUTION: This ventilator has an opening B on a roof face A or side or gable face, a window frame 1 which faces the opening B and can be freely opened or closed, a driving rod 2 which can freely move in the axial direction along the window frame 1, a support lever 3 extending in the direction perpendicular to the driving rod 2, a support link 4 connected to the window frame 1 at one end and to the support lever 3 at the other end through hinges in such a way to freely rise or fall, and a driving link 5 connected to the driving rod 2 at one end and to the support link 4 at the other end through hinges, wherein the driving rod 2 is moved in the axial direction by a driving member to raise or fall the support link 4 via the driving link 5 and thereby to move the window frame 1 to the open or closed position. |
