| 摘要 |
A system for providing a pneumatic connection between an object and a wall which are capable of relative displacement, which comprises a guiding chamber which confines a gas layer at a pressure which is different from the ambient pressure, said chamber being delimited by skirts which are carried by the object and directed towards said wall. At least a part of the skirts is capable of moving with respect to the skirt-carrying object and is positionally controlled relative to this latter. At least one movable skirt is connected mechanically to the movable partition of a variable-pressure pneumatic balancing chamber which is mounted on the object and separate and distinct from the guiding chamber. Pneumatic control means are further provided for adjusting the position of said partition as a function of the distance from the lip of the movable skirt to the wall. Under these conditions, the lips of the skirts can be maintained at a practically constant distance from said wall. The object can be a vehicle and the wall a track provided for said vehicle.
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