| 摘要 |
PURPOSE: A door closer is provided to reduce manufacturing and maintenance costs by simplifying the mechanical structure of the door closer and to maintain the opening state of a door at various angles. CONSTITUTION: A door closer comprises a doorframe mounting portion(100), a frame(200), a rotary link(300), a connection link(400), a coil spring(500), and an actuating arm(600). The doorframe mounting portion is fixed to a doorframe(F). The frame is rotatably connected to one side of the doorframe mounting portion. The rotary link is rotatably connected to the other side of the doorframe mounting portion and has a first rotary roller(310) moved along a guide hole(240) of the frame. The connection link is rotatably connected to the rotary link and has a second rotary roller moved along the convex, concave, and curved portions of the frame. The coil spring is connected to the rotary and connection links. The actuating arm is connected to the frame and a door. |
