| 主权项 |
1. A 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 relatively thin main area and elongate side edge sections that are thicker than the remainder of said sheet, a shoulder being formed where each side edge section meets said main area; a curtain winding mechanism having said upper end attached thereto for raising said curtain; and one or more opposing angled blades for forming guide channels in which said side edge sections are respectively movable, said edge sections having a relatively lower surface friction than said main area, wherein the one or more opposing angled blades are held by a gripping bracket so that the blade bends less easily in a first direction and more easily in a second opposing direction, and provide a one way bearing functionality such that the flexible sheet is allowed to freely travel vertically with reduced resistance, and the one or more opposing angled blades are angled toward an inner space of the guide channels, wherein the gripping bracket provides greater resistance to deflection of the blade when the blade is contacted by the shoulder moving in the first direction away from the inner space of the guide channel and less resistance to deflection of the blade when the shoulder is moving in the second direction toward the inner space of the guide channel such that the one way bearing functionality provides increased resistance to horizontal deflection of the flexible sheet, and easily allows the flexible sheet to be reinserted upon dislodging, wherein the door is capable of retaining wind loads of up to 100 mile/hour. |
