REVOLVING DOOR CONTROL SYSTEM

A revolving door and controls therefor are set forth to restrict access into a room to only authorized personnel. The revolving door is disposed in a housing having an entrance and an exit into the room. The revolving door includes a plurality of wings which, in cooperation with the housing, define a plurality of compartments movable in response to rotation of the door to transport a person between the entrance and exit through the housing. Included are means for identifying authorized personnel and driving the door for rotation to transport that authorized person in a selected compartment between the entrance and the exit. Means are included for sensing two or more persons in the selected compartment moving from a starting point between the entrance and the exit, the sensing means reversely rotating the door to return the selected compartment to the starting point. Also included are means to prevent a subsequent, unauthorized person, attempting to use the same card key passed back by an authorized person passing through the door.