Patent ID: 8684064

Claim:
An industrial rollup door for closing or opening a doorway fitted with side rails and a cross piece spanning the doorway width proximate to the top of the doorway comprising: a door leaf comprising a plurality of elongated rigid lamellae, each lamella having a left end portion, a right end portion, a top portion, a bottom portion, an inner surface and an outer surface; at least one flexible lifting belt on each end portion of the lamellae; end pieces fitted to the end portions of each lamella to engage the lifting belt at an intermediate portion; a continuous, flexible dampening profile strip fixed to each end portion of a top lamella and positioned on the outer surface of the end portions of a plurality of lamellae; and a rotatable shaft fitted with a spiral disc profile including a dampening profile attached to the outer circumference, the spiral disc profile adapted to accept the lamellae in successive layers as the shaft rotates in a first direction, and to release the lamellae as the shaft rotates in a second direction; wherein the flexible dampening profile strip is secured to the bottom of the door leaf by a compensating member extendable between a first position and a second position.