| 摘要 |
A door closer assembly for controlling the operation of a door relative to a door frame includes a door closer mounted on the door and an articulated arm assembly which has one end attached to the door closer and the other end pivotally secured to a slide block which travels in a track mounted on the door frame. The slide block is affixed to a piston rod, which comprises part of a fluid piston-cylinder assembly also mounted on the door frame, and is located at the end of the track remote from the hinged edge of the door when the door is fully closed. When the door is opened beyond a predetermined angular position relative to the door frame the slide block moves within the track and in the direction of the hinged edge to another location within the track wherein it is releasably retained by the piston-cylinder assembly until the door is nearly fully closed by the reaction force of the door closer. As the door approaches its fully closed position a valve actuator mounted on the door operates a control valve to release the holding force of the piston-cylinder assembly and allow the slide block to be biased to its location at the remote end of the track by a spring contained within the piston-cylinder assembly. |
