| 摘要 |
PURPOSE: A door closer is provided to improve an environmentally-friendly effect because oil is not required and to maintain the opened state of a door at various angles. CONSTITUTION: A door closer comprises a doorframe mounting unit(100), a frame(200), a rotary link(300), a connection link(400), a coil spring(500), an elastic spring(600), and an operation arm(700). The doorframe mounting unit is composed of an attachment unit(110) and a mounting unit(120). The attachment unit is installed on a doorframe(F). The mounting unit is integrally formed on the attachment unit. The frame is rotatably connected to one side of the mounting unit. The rotary link is connected to the other side of the mounting unit. The center part of the connection link is coupled to the rotary link. Both ends of the coil spring are connected to the rotary and connection links. Both ends of the elastic spring is connected to the mounting unit and the frame. The operation arm is connected to the other end of the frame and installed on a door. |
