Building access system has door opener which can only be actuated if two switches are operated simultaneously

摘要

The system includes a living station (14,16), and a door station (18,20) for a door which closes of a certain region. A signal transmission system (10) is between the living station and the door station. A switch (40,42) in the door station controls a door opener (24,26), which can be operated via the signal transmission system. A second switch (44) for controlling the door opener can be operated from the living station and is connected to the door opener and the first switch in such a manner that the door opener is only driven when the first and the second switches are operated simultaneously. The second switch is arranged within the region closed off by the door, e.g. behind the door.