| 摘要 |
PURPOSE: A door opening and closing device having an opening degree adjusting function is provided to fix the opened state of a door and to automatically close the door using a small amount of power. CONSTITUTION: A door opening and closing device having an opening degree adjusting function comprises a rail part(100), a moving part(200), a locking part(300), a link(400), and a damper(500). The rail part is installed on the top surface of an entrance and has ratchet portions(120) and plane portions(140). The moving part is slid along the rail part. The locking part is rotatably installed on the moving part. When the locking part is rotated in a direction, the locking part is automatically restored to the original position thereof. Both ends of the link are rotatably coupled to the moving part and the damper. The damper forcefully rotates the link to close a door(d). |
