Patent ID: 6942003

Claim:
A roll up door assembly for selectively covering a door space defined by a door frame, comprising: a flexible sheet having top and bottom edges, a front and a back side and elongate vertical side edge portions of greater thickness than the remaining portion of the sheet, said side edge portions having elongate, vertical, inner edge surfaces that extend substantially perpendicular to said remaining portion when said sheet is unrolled and flat; a barrel adapted for rotatable mounting above said door frame, said sheet attached to said barrel and being coilable upon said barrel for storage thereupon and selectively extendable downwardly therefrom to extend over the door space during use of the door assembly; a pair of vertically extending door guides assemblies each adapted for mounting adjacent a respective vertical edge of the door frame, each door guide assembly defining a vertical slot having a vertical opening extending along the length of the slot, each slot being oriented and sized to accept a respective one of said vertical side edge portions for vertical movement therein; each said door guide assembly having a windbar assembly attached thereto, positioned in a slot narrowing position in which a portion thereof extends over the opening of said slot to narrow said opening such that the narrowed opening has a smaller width than the total thickness of a respective one of said side edge portions; and biasing means for biasing said windbar assembly to said slot narrowing position with sufficient force to normally hold the respective vertical side edge portion within said slot during use of said door assembly, while permitting the side edge portion to be released from the slot through its opening upon an impact to the sheet.