| 摘要 |
PURPOSE: A door closer is provided to maintain the opening of a door without using auxiliary tools such as a stopper and to reduce raw material costs by simplified mechanical structure. CONSTITUTION: A door closer comprises a first interlocking arm, a second interlocking arm(200), a housing(300), a state retainer(400), a power transmission unit(500), and an elasticity control unit(600). The housing is installed on the top of a door frame. The state retainer maintains the openness of a door. The power transmission unit is installed on the housing. The elasticity control unit is installed in the housing to control the closing speed of the door. |
