Flexible curtain rollup door with combination stiffening struts and windlocks

A flexible curtain door for forming a closure over an opening comprising:

• an elongated flexible curtain including a transverse bottom edge and opposed side edges;
• a door frame including opposed side edge guide tracks comprising members forming opposed slots for receiving side edges of said curtain therein;
• and
• plural spaced apart elastically deflectable combination stiffening strut and windlock members secured to said flexible curtain at spaced apart points thereon, said combination strut and windlock members including opposed windlock parts disposed in said guide tracks and adapted to retain said curtain in said guide tracks, said windlock parts in one of said guide tracks being configured to release said curtain from said one side track, and said windlock parts disposed in the other guide track being configured to retain said curtain in said other guide track in response to forces acting to displace said curtain from said guide tracks.

In a rollup door comprising a flexible curtain closure member having a transverse bottom edge and opposed side edges, said curtain being adapted to be wound on and unwound from a rotatable drum;

• spaced apart guide tracks for guiding said side edges of said curtain for movement between open and closed positions of said door;
• at least one combination strut and opposed windlock members connected to said curtain, said windlock members being disposed adjacent said opposed side edges and adapted for movement within said guide tracks, respectively, for retaining said curtain in said guide tracks, one of said windlock members being responsive to a predetermined deflection of said curtain to exit one of said guide tracks while the other of said windlock members retains said curtain in the opposite one of said guide tracks whereby said curtain is relieved of forces acting thereon by exiting said guide track along said one side edge of said curtain;
• and
• said one windlock member includes surfaces formed thereon for engagement with at least one of opposed flanges of said one guide track for deflecting said one flange in response to deflection of said curtain to provide for said one side edge to exit said one guide track

A flexible curtain door for forming a closure over an opening comprising:

• an elongated flexible curtain including a transverse bottom edge and opposed side edges;
• opposed side edge guide members for guiding said side edges of said curtain;
• and
• a flexible bottom bar assembly secured to said curtain at said bottom edge and comprising a plurality of flexible bags filled with particulate material and secured to said curtain adjacent said bottom edge substantially side by side across at least a portion of said bottom edge.