| 摘要 |
<p>A safety device, particularly intended to be used in roll-up doors to cause reversal of the door closing movements in case an obstacle obstructs the path of movement of the door. The device (6) comprises at least a couple of photoelectric cells (7) which are arranged at a certain distance from the closing edge of the door leaf (1) in alignment with the door leaf (1) by means of a support arm (9) which is displaceable in the direction of closing of the door.</p> |
