Revolving door system

A security door system for permitting passage of persons therethrough in one direction while ejecting persons trying to pass therethrough in the other direction, comprising:

• a rotatable center shaft defining an upright axis capable of 360 degree rotation;
• a plurality of at least 3 wings circumferentially disposed about the shaft rotatable about the axis;
• a pair of upright opposing curved panels disposed in facing spaced apart relationship to define a partially enclosed region bounding the wings and defining opposing first and second openings;
• electrically operated means for rotating the shaft in first and second rotating directions;
• means for actuating the door to turn in a first rotating direction to permit an authorized person to pass through the system;
• means for monitoring the rotation and position of the wings and including index means for stopping the rotation of the shaft at plural predetermined positions defined by quarter-point positions of the wings and panels;
• means for detecting the presence of a person attempting to pass through the system in the opposite unauthorized direction;
• means responsive to said detecting means for automatically stopping the rotation of the door and reversing its rotating direction to a point not further than the quarter-point position before the unauthorized passage is completed to back the person out toward their point of entry;
• and
• means for automatically re-enabling the rotation of the door in the first rotating direction when the unauthorized person is no longer detected, said stopping, reversing and re-enabling functions being automatically performed by said system without human intervention.

A revolving door system comprising:

• a rotatable center shaft defining an upright axis;
• a plurality of wings circumferentially disposed about the shaft rotatable about the axis;
• a pair of upright opposing panels disposed in facing spaced apart relationship to define a partially enclosed region bounding the wings and defining opposing first and second openings;
• means for rotating the shaft including a DC electric motor;
• and
• controller means for actuating the shaft rotating means in a forward rotation direction including means for coupling the motor in a regenerative mode to brake the rotation of the center shaft and in which the controller provides for an initial actuation of the shaft at a first rotational speed, and means for actuating the shaft at a second rotational speed less than the first rotational speed;
• first sensing means for detecting the presence of a person entering the partially enclosed region from the first opening, the controller means responsive to the first sensing means for stopping rotation of the shaft means in the forward rotational direction and for thereafter actuating the rotation means in a direction opposite the first direction;
• second sensing means responsive to a person at the second opening to initiate a normal rotation cycle;
• whereby a person attempting to pass from the first opening to the second opening is prevented from doing so and is forced back to the first opening.