Patent ID: 6152207
Filing Date: 2000-11-28
Classification: E06B

Abstract:
In a rollup door for forming a barrier across a doorway, a flexible curtain closure member, elongated winding means for rolling said closure member onto and off of said winding means for opening and closing said door, opposed side edge guide means extending generally along the path of movement of said closure member between open and closed positions, a first elongated windbar extending between said guide means, first flexible strap means supporting said first windbar and operable for raising and lowering said first windbar in response to rolling said closure member onto and off of said winding means and a second elongated windbar operably connected to said first windbar and moveable with said first windbar between extended and retracted positions to position said second windbar between said first windbar and a lower transverse edge of said closure member in a closed position of said door and means for interconnecting said second windbar with said first windbar and said winding means for moving said second windbar between said positions at a rate greater than and in response to movement of said first windbar.