| 摘要 |
PURPOSE: An automatic fire door closing device is provided to reduce the initial facility costs, maintenance costs, and allows it to be checked by a general person without electronic or mechanical knowledge. CONSTITUTION: An automatic fire door closing device(10) comprises a latch(20), a fixing unit(40), and a combustion string(12). The latch is formed in order to be hung on a fire door when the fire door is opened and comprises a cylindrical pipe(24) and a hook(26). The fixing unit is connected to the latch with a hinge block(22) and comprises a rectangular pipe(50) and a separation block(60). The combustion string is formed as a material destroyed by fire. One end of the combustion string is fixed to a wall(1), and the other end is fixed to the fixing unit. When the combustion string is destroyed, support power for supporting the separation block is removed so that the fire door is closed. |
