| 摘要 |
PURPOSE: An auxiliary closing device of a door is provided to secure a smooth operation of a fire door and prevent the wear of parts. CONSTITUTION: An auxiliary closing device of a door comprises a body(10), a cam(20), and a link joint(30). The body is embedded with a main spring(15). The cam has a central coupling hole(22) in which a rotary shaft of a door closer is coupled and a circumferential protrusion(25) which is elastically installed in the main spring. The link joint contacts the outer surface of the cam when a door is opened completely and is bent to the protrusion of the cam so that the expansion force of the main spring is transmitted to the torque of the cam just before the door is closed. |
