A Threshold Rise-fall Apparatus for Fire Prevention Door

摘要

The present invention relates to an automatic threshold ascending and descending device for a door frame for a fire door. According to the present invention, a threshold of a door frame is divided into three sections in the longitudinal direction in the door frame in which a fire door panel is installed. Both sides of the threshold are formed as a fixing threshold, and the center is formed as an ascending and descending center threshold. Therefore, the ascending and descending center threshold can ascend and descend by the automatic threshold ascending and descending device installed on the lower side of the inner part of the ascending and descending center threshold. The automatic threshold ascending and descending device for a door frame for a fire door can be automatically or manually controlled. According to the present invention, the automatic threshold ascending and descending device for a door frame for a fire door can prevent casualties by easily moving a load for moving, a wheelchair, and a bed, using the lowered threshold by smoothly obtaining a path by usually reducing the height of the threshold by dropping the ascending and descending center threshold down by the automatic threshold ascending and descending device. The automatic threshold ascending and descending device can maintain the ascending and descending center threshold while the ascending and descending center threshold is raised by the automatic threshold ascending and descending device in emergency such as fire. Therefore, the automatic threshold ascending and descending device can support the fire door panel and prevent the spread of smoke by blocking the smoke.