| 摘要 |
<p>An automatic door closer has a piston assembly dividing a housing into two pressure medium chambers. The piston assembly is moveable by a cam roller in camming engagement with a cam that rotates during an opening or closing movement of a door. The piston assembly includes two parts, a coupling part and an outer part. The coupling part provides for connection to the cam roller and the outer part seals one pressure medium chamber from the other pressure medium chamber. The coupling part and the outer part are connected firmly together by a connecting element.</p> |
