| 摘要 |
<p>A door closer comprising a damper unit having a piston (9) which is moveable within a chamber (3) and which carries a piston rod (7) which projects from the chamber (3) and is operatively connected to a door so that opening and closing movement of the door is accompanied by movement of the piston (9) in the chamber (3), a spring (14) being provided externally of the chamber (3) for biasing the piston (9) in one direction. Preferably a spring support element (15) is provided to ensure a substantially even thrust on the piston (9). <IMAGE></p> |
