| 摘要 |
The present invention relates to a closer of a fire door for easily setting an opening position which ordinarily opens or closes a fire door in freedom and easily maintains the opened state at a stop position which needs opening but surely closes the fire door in case of an emergency, such as fire, so as to block fire and smoke. That is, in a conventional closer of a fire door which rotatably connects a connection arm (50) connected to a fixed member (60) fixed to a standard arm (10) and a door frame (3) connected to a closer body (40) mounted on the fire door (2), the standard arm (10) is divided into a standard member (11) and an operation piece (12), and the standard piece (11) and the operation piece (12) are respectively connected to a standard link (13) and an operation link (14), such that the operation piece (12) based on the standard piece (11) rotates around the standard link (13) as long as a rotation radius of the operation link (14), a retaining piece (30) of a semicircular shape which has a plurality of retaining grooves (31) formed on the outer circumference of the upper portion of the closer body (40) at uniform intervals is formed in the same direction as the standard piece (11), and a retaining member (20) having a retaining protrusion (22) is fixed at the upper portion or the lower portion of the operation piece (12), such that the retaining protrusion (22) is inserted into or removed from the retaining groove (31) according to whether or not the operation piece (12) is rotated. |
