Patent ID: 8291960

Claim:
A roll-up door comprising: a flexible sheet forming a curtain for closing a doorway having an upper end, a lower end, and two opposite side edges, said sheet having a curtain retention arrangement located along two side edge sections thereof; a curtain winding mechanism having said upper end attached thereto for raising and lowering said curtain; a pair of spaced apart elongate guide members in which said edge sections are respectively movable, said side edge sections being respectively engageable with said guide members; a rigid bottom bar mounted on said lower end of the curtain; two bar connectors for connecting opposite ends of said bottom bar to the guide members, each bar connector being located horizontally outwardly from a respective one of the ends of the bottom bar and being adapted to move up or down in its respective guide member and to be held therein; two pivot mechanisms each pivotally joining a respective one of said bar connectors to the adjacent end of the bottom bar, each pivot mechanism including a pivot shaft member having a central pivot axis and a shaft receiver into which said pivot shaft member extends and in which said pivot shaft member can pivot about its central pivot axis relative to the shaft receiver, one of the pivot shaft member and the shaft receiver being connected to a respective one of the bar connectors and the other of the pivot shaft member and the shaft receiver being mounted on the bottom bar; and two stop members each mounted on a respective one of the pivot shaft members for limiting pivotal movement of the respective pivot shaft member relative to its shaft receiver during use of the roll-up door when the curtain is subject to windload or greater air pressure on one side of the curtain compared to the other side of the curtain, wherein each stop member extends into a slot formed in the shaft receiver into which the respective pivot shaft member extends.