| 摘要 |
<p>A drive (10) for a building door arrangement (11) comprising a gear box means (13) and a motor device (12). The motor device (12) is provided for driving the gear box means (13) for operating a door between an open and a closed position, the drive (10) is provided for disengaging and engaging relatively to the door arrangement (11). A detecting device is provided for detecting the state, disengaged or engaged, of the connection between the drive (10) and the door arrangement (11), further the detecting device is of a non-contact type. <IMAGE></p> |
