| 摘要 |
The vehicular access control barrier (3) is mounted to rotate in a vertical plane (VV). A safety mechanism allows the head (1) which carries the barrier to rotate in a horizontal plane (HH), against an adjustable frictional force. The access control barrier for vehicle includes a mechanical head (1) mounted on a support (20), carrying the barrier itself (3) mounted to rotate in a vertical plane (VV). A safety system allows the arm to be lifted again in the event of collision with a vehicle. A further mechanism allows the head (1) to rotate in a horizontal plane (HH). A frictional link between the head (1) and the support (20) allows rotation in the horizontal plane in the event of a collision, with an adjustment provided for the degree of force necessary to initiate this rotation. This adjustment is provided by two surfaces which have a low coefficient of friction between them, with a compression system pressing the surfaces together in order to provide the necessary friction to oppose rotation.
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