| 摘要 |
<p>The installation is comprised of a gate of which the leaf (3) is supported by a vertical shaft (5) rotationaly driven by motor (9) servo-controlled by a control system which includes a photoelectric cell capable of detecting the penetration of a person in a corresponding passage, in the authorized direction, in order to make the shaft (5) of the gate turn in the opening direction. The installation is also comprised of a central system for managing the operation of the gate and for actuating the motor (9) in one direction and in the opposite direction, and such managing system is servocontrolled by electromechanically control means (17) for both directions of rotation of the shaft (5) of the gate (2) as well as for the angular position of said shaft. In the case of rotation of the gate in an unauthorized direction, while the gate was previously closed or during its opening, this managing system is capable of controlling on the one hand the operation of a warning apparatus and on the other hand maintaining in operation or setting in operation a device (13, 14) for braking the shaft (5) of the gate, such braking device being capable of slowing down the shaft through out its rotation in the unauthorized direction while allowing such rotation under the effect of a pushing force exceeding a predetermined value.</p> |
