| 摘要 |
PURPOSE: A door closer controlling crossing speed of a door using damping action of fluid is provided to prevent damage to a door closer or the door. CONSTITUTION: A piston(4) moves right and left according to the opening and closing of a door. A pressurization means pressurizes the piston after the door is opened. A damping means controls the closing speed by applying the fluid pressure to the piston. A door opening damping releasing means is made of a first valve part(10). A door closing damping releasing means is made of a second valve part(20). |
