Patent ID: 7401438

Claim:
A revolving door comprising: curved, segmented shell elements not connected to each other, the shell elements comprising at least one movable wall segment, the shell elements are positioned between an inner wall and an outer wall defining at least one containment area therebetween, and the inner wall partitions the at least one containment area from an inner area and the outer wall for partitioning the at least one containment area from an outer area; door leaves mounted on a rotation axis, the door leaves placed between the shell elements so that the door leaves are separated from the at least one containment area by the shell elements and positioned so that the door leaves are freely rotatable and are not directly coacting with the shell elements as an edge of each door leaf moves past the shell elements during rotation of the door leaves; and a sensor system in communication with the at least one wall segment to move the at least one watt segment for opening or closing off at least one of the shell elements to the at least one containment area.