| 摘要 |
PCT No. PCT/IT97/00185 Sec. 371 Date May 14, 1999 Sec. 102(e) Date May 14, 1999 PCT Filed Jul. 23, 1997 PCT Pub. No. WO98/03759 PCT Pub. Date Jan. 29, 1998A filtering gate for the protection of a site includes two boxes arranged side by side and forming two corridors allowing communication between an inside of the site and an exterior of the site. A first and a second pair of leaves are located at an inside front and an external front, respectively, of the boxes arranged side by side, the leaves of each pair being movable parallel with respect to each other and transverse to a flow passing in the corridors, each leaf being movable independent of the other leaf of the pair, between a first position in which it blocks passage through one of the corridors and a second position in which it blocks passage through the other of the corridors. In a normal operating mode, the movement of one leaf of each pair is immediately followed by the movement of the other leaf of the same pair, as soon as the first leaf of the pair has completed moving between the positions, the movement of each leaf of one of the two pairs of leaves occurring simultaneously with the movement of a corresponding leaf of the other pair of leaves.
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