| 摘要 |
A door (2) is linked to its frame (1) by means of a door closer (4) via arms (5, 6) which are articulated one to the other. The location of the fulcrum (11) of the remote end of the arm (6) closest to the door, is moved, relative to the door closer (4), in order to change the turning moment exerted on the door (4) by the door closer in such a way that different turning moments apply in separate phases of opening and closing of the door. In addition, for preventing opening of the door, the fulcrum (11) can be shifted such that the turning moment required to open the door is considerably increased (e.g. by aligning the arms (5, 6) one above the other). <IMAGE> |
