| 摘要 |
A flexible curtain (8) for a concertina-type door includes a strip (12) of flexible material running along each of its side edges and suitable for coming into contact with the bottoms of the edge-receiving grooves in each of the door posts (1). If the flexible curtain includes reinforcing bars (9) having guide-wheels (11) at their ends, the strips may include wheel-receiving gaps. Advantageously, the strips are constituted by brushes having long and flexible bristles. If the curtain has reinforcing bars which do not include guide-wheels (11) the reinforcing bars need not penetrate fully into the grooves in the door posts (1), thereby leaving room for the strips (12) to be constituted by the edges of the curtain (8) itself, with the curtain being wider than the distance separating the bottoms of the facing door post grooves. The strips (12) provide draft-proofing for the concertina-type door under all normal conditions, i.e. regardless of whether the outside pressure is greater than the inside pressure or vice versa, or there is substantially no pressure difference between the outside and the inside.
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