| 摘要 |
A revolving door in which the center revolving support is generally cylindrical with a diameter at least 0.3 that of the space between the stationary walls of the door. Four door panels are hinged to the central member, and maintained in their normal positions by hydraulic door closers, so that the door panels can be rotated about their hinges to storage positions alongside the central member, and can be deflected when the door panels catch up to persons within the door. Radar type sensors detect the presence of people entering the doors, and speed up the rotation speed of the doors to facilitate movement through them. Proximity sensors on the door panels slow down the rotation of the door when a door panel begins to catch up to a person within the door. Door swing-back sensors detect when a door panel is pushed back (against the direction of door rotation) by contact with a person within the door, and cause the door to stop rotating upon such an occurrence. Means is also provided to store the door in a rotational position in which all four door panels engage stationary side walls, and to lock the door panels against the side walls in the storage position.
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