| 摘要 |
PURPOSE: A door closer is provided to reduce manufacturing and maintenance costs by simplifying the structure of the door closer and to maintain the opened state of a door at various angles. CONSTITUTION: A door closer comprises a doorframe mounting unit(100), a power transmission unit(200), and an actuating arm. The doorframe mounting unit is composed of an attachment unit and a mounting unit. The attachment unit is installed on a doorframe. The mounting unit is integrally formed on the attachment unit. The power transmission unit is composed of an outer frame(210), a speed reducer, a forward and backward rotation motor, an elastic spring(240), an inner frame(250), and a rotation link(260). The elastic spring connects the mounting unit to the outer frame. One end of the rotation link is connected to the mounting unit. The actuating arm is connected to the other end of the outer frame of the power transmission unit and is fixed to a door. |
