| 摘要 |
<p>The present invention relates to an opening and closing device for a greenhouse comprising: a frame; a first gear which is mounted on the frame and linearly moves one rack gear in order that a gear axis rotates in one direction; a second gear which is mounted on the frame and linearly moves other rack gears neighboring the rack gear in order that a gear axis rotates in the direction opposite to the first gear; a reverse rotational power transmission means which transfers a rotational force by being installed in between the first gear and the second gear and rotates the second gear in the direction opposite to rotating direction of the first gear.</p> |
