| 摘要 |
PURPOSE: To downsize an automatic door by providing, on a front wall plate having an opening part, front and rear door bodies, a rail, and a driving cylinder in parallel state, and making a door body for opening and closing the opening part of the front wall plate into a two-piece structure. CONSTITUTION: When the tip of a rod 17 is raised by a driving cylinder 16, a main plate 25 rises, and a pair of sprocket wheels 50, 50a also rise. In a chain 53 wound on the wheels, the individual chains are moved and raised throughout. By the rise and transfer of the chain 53, a specific point 54 is fixed, the chain 53 is moved on the specific point 54 side going-out route and on the opposite side returning route to the specific point 54 in the same distance, and a connecting point 62 on the opposite route is moved in a distance twice the moving stroke S of the sprocket wheels 50, 50a. Since the main plate 25 and the connecting point 62 of the chain 53 are moved in distances of stroke S and stroke 2S, respectively, a front door body 3 mounted on the main plate 25 and a rear door body 5 connected to the connecting point 62 are moved in a ratio of 1:2. |
