| 摘要 |
A manually operable carousel revolving door having a locking element with a rotary axle disposed inside. The door comprises a braking motor, a rotational speed detector and a rotation direction detector, all actively connected to the locking element. If the door rotates at a speed above a predetermined rate or in a wrong direction, the rotation speed detector and the rotation direction detector signals the braking motor to act on the rotary axle of the locking element to slow the rotation rate of the door. The braking motor can be disposed in a receptacle in the top side covering in the revolving door. In addition, the braking motor can be connected to the rotary axle via a chain drive or a toothed gear drive.
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