| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the generation of rattling when closing a ventilation port by oscillating the lower side of a window frame, concerning the improvement of a ventilation system arranged in a plastic greenhouse or others. <P>SOLUTION: The ventilation system has a ventilation frame 1 forming the ventilation port C, the window frame 2 of which the lower side is oscillatably attached to the front face of the ventilation frame 1, a supporting post 3 which is installed in the ventilation frame 1 and in which a slit 30 is formed, supporting materials 4L 4R installed in the window frame 2, a driving means 5 for driving the window frame 2, and a biasing means 9 for biasing the window frame 2 in a direction opening the ventilation port C, and further has a housing 50 in which the driving means 5 is fixed to the back face of the supporting post 3, a gearwheel 6 rotatably supported by the housing 50, a driving arm 7 in which a base 70 meshes with the gearwheel 6, a driving arm body 71 continuously arranged in the base 70 penetrates through the slit 30 and projects to the window frame 2 side and rotates in a vertical direction along with the rotation of the gearwheel 6, and links 8L, 8R one end sides of which are oscillatably coupled to the distal ends 71a of the driving arm 7 and the other end sides of which are oscillatably coupled to the supporting materials 4L, 4R. <P>COPYRIGHT: (C)2012,JPO&INPIT |
