FIELD: construction.
SUBSTANCE: commercial folding door for closing or opening of a door opening, equipped with side guides and a crosspiece, covering the door opening along the width near its top, comprises a door leaf with extended rigid bars, every of which is arranged with the left end, right end, upper and lower parts, inner and outer surfaces, at least one flexible lifting tape, arranged on each end part of bars; end parts coupled with end parts of each bar, a continuous flexible damping profiled strip attached to each end part of the upper bar and arranged on the outer surface of end parts of several bars, and a rotary shaft, with a spiral profile, arranged as capable of installing bars in serial layers as the shaft rotates in the first direction, and bars release as the specified shaft rotates in the second direction.
EFFECT: increased sound insulation and wear resistance of a structure.
15 cl, 9 dwg
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