| 摘要 |
A doorway to make flows cross which have different origins and destinations and which prevents said flows from mixing, the doorway comprising at least two flaps that revolve about a common axis and at least three side walls in arcs of a circle centred on said axis, said side walls being disposed facing at least one access path or outlet path at the periphery of the door, said side walls being horizontally extensible in length to close and horizontally retractable in length to open, vertical walls defining said paths between said vertical walls, said side walls being detachably secured to said vertical walls and being horizontally extensible or horizontally retractable along said arcs of a circle, and means selectively to connect and disconnect said side walls to and from said flaps.
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