| 摘要 |
<p>The present invention provides an automatic closing device and system for fire doors. The automatic closing device includes an actuating unit and a door lock unit. The actuating unit includes a box-shaped main body, a pair of support walls each having a shaft hole and installed in the main body, an actuating shaft inserted into the shaft hole of each of the support walls and moving in a horizontal direction, a rack mounted on an outer surface of the actuating shaft and sliding along the actuating shaft within a predetermined distance, and a pinion engaging with the rack and rotated by a movement of the rack. Further, an actuating bar connects a shaft of the pinion to a door closure unit which closes a fire door using hydraulic pressure. The door lock unit functions to lock or unlock a locking latch of the actuating shaft, using a locking unit.</p> |
