| 摘要 |
The present invention provides a simultaneous closing system for fire doors. The system includes a plurality of individual fire door hook units provided on respective fire doors, a plurality of individual wall-embedded locking units embedded in walls to correspond to the individual fire door hook units, a simultaneous release unit, a drive means, and an automatic closing device. The simultaneous release unit is supported by upper and lower portions of the building and rectilinearly moved within a predetermined vertical range, thus simultaneously releasing the individual fire door hook units from the individual wall-embedded locking units. The drive means functions to drive the simultaneous release unit. The automatic closing device is provided on each of the fire doors, and includes an actuating unit having an actuating shaft, a rack, a pinion, and a pair of support walls. |
