| 摘要 |
PURPOSE: A door closer is provided to improve an environmentally-friendly effect because oil is not required and to freely control the opening degree of a door. CONSTITUTION: A door closer comprises a doorframe mounting unit, a power transmission unit, and an actuating arm. The doorframe mounting unit is composed of an attachment unit(110) and a mounting unit. The attachment unit is fixed to a doorframe. The mounting unit is integrally formed on the attachment unit. The power transmission unit is composed of an outer frame(210), a fixed gear, a speed reducer, a forward and backward rotation motor, a movable gear, an elastic spring(260), an inner frame(270), and a rotation link(280). The fixed gear and the speed reducer are installed on the outer frame. The movable gear is meshed with the fixed gear. 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 and fixed to a door. |
