Patent ID: 8779891

Claim:
An access control device having a central unit which is designed to wirelessly receive access authorization data stored on personal transponders, evaluate the access authorization data, and to output release signals via a wireless signal transmission link and to release a relevant interlocking unit and which has an authentication device with a testing stage in which comparison data for testing the receive access authorization data for access authorization is present, wherein, in addition, at least one input station having an input unit is present which is or can be used to establish a wireless data transmission connection to said central unit for transmission of input data that is different from the access authorization data, the authentication device is designed to operate in two stages and has a further testing stage which is designed for direct or indirect allocation of the input data to the access authorization data and to check agreement between the access authorization data and the input data with regard to the access authorization, and said central unit is designed to output the release signals when the access authorization has been established after checking by means of the further testing stage, wherein the access control device is provided with a distance measuring device for determining the distance between at least one personal transponder and at least one interlocking unit or the relevant input station or input unit and said central unit is equipped with a decision unit by means of which said release signals may be suppressed until a predetermined minimum distance is fallen below; and wherein the access control device is equipped with a position determining device for determining the position of at least one personal transponder and said central unit is provided with a decision stage by means of which said release signal may be suppressed as long as said personal transponder is located outside a predetermined area; wherein an inductive coupling unit is provided which is effective in a closed state of a door of a switchgear cabinet and which is disposed at an interlocking unit located at the door for introducing electrical energy from said switchgear cabinet into the interlocking unit, wherein a transformer winding is located on the cabinet side in the frame which is charged by an energy source and a load winding is disposed within said interlocking unit which in a closed state of the door is located adjacent to the transformer winding.