Patent ID: 8800632

Claim:
A twin roller smoke or fire barrier comprising: two parallel rollers and a curtain comprised of a plurality of narrow curtain panels rolled on each of the two parallel rollers and arranged along the length of each of the two parallel rollers on alternate rollers with only vertical end margins overlapping opposite each other; the barrier including: a separation varying mechanism for varying separation of the two parallel rollers by at least the change in the overall diameter of one of the two parallel rollers and its curtain panels between wound-up and unwound states, the mechanism including: supports for the two rollers, at least two of the supports being movable supports for at least one of the two parallel rollers to provide movably a supported roller or rollers, the supports supporting at least the ends of the supported rollers, whereby in the unwound state of the curtain, the overlapping vertical end margins abut or at least are separated by a negligible amount at the two parallel rollers.