Collapsing closure system and operating mechanism

摘要

Vertical and non-vertical collapsing panel closures for various applications are disclosed. The closure has reduced stacking height when collapsed and possesses a more energy efficient panel section guide roller system operating with a more economical and versatile upper and lower guide roller track arrangement. An insulated closure having an interior flush surface and an exterior rail and stile facade is achieved. A more simplified variable dynamic closure counterweighting system is provided.