| 摘要 |
<p>An improved system for sealing a slot (37) in the guideway (13) of a pneumatic transportation system includes two separate pairs of sealing flaps for producing two separate opposed seal interfaces (47, 49) through which a travelling pylon (18) connecting a propulsion plate (17) to a vehicle (15) on the guideway can pass. A first pair of sealing flaps (43a, 43b) provides a negative pressure seal and a second pair of sealing flaps (49a, 49b) provides a positive pressure seal. The sealing flaps contact the travelling pylons along their distal ends only, so as to produce minimum deflection of the seal and minimum mechanical resistance against the pylon. The slot seal system of the invention is relatively easy to install from outside the vehicle guideway and produces no cavities in the top of the guideway in which moisture and debris can accumulate.</p> |
