Patent ID: 8387642

Claim:
A fabric structure comprising: a fabric wall panel of the fabric structure defining a plane of the panel and defining side edges of the wall panel and a bottom of the wall panel for resting along a ground surface; an opening in the fabric wall panel; a fabric closure panel for closing the opening having a hinge line along one side connecting the closure panel to the wall panel; wherein the fabric wall panel at the opening and the fabric closure panel each define an edge thereof opposite to the hinge line with the edge of the fabric closure panel overlapping the edge of the fabric wall panel at the opening for closure thereon; a flexible bowing strip attached to the edge of the fabric closure panel opposite to the hinge line; the flexible bowing strip having first and second ends which are separate from one another allowing relative movement of one relative to the other; the flexible bowing strip being forced into a flexed shape by engagement with the edge of the fabric closure panel from an initial different shape of the bowing strip such that the flexible bowing strip is under tension tending to return the flexible bowing strip to the initial shape; the tension in the flexible bowing strip acting to generate forces in the flexible bowing strip biasing the first and second separate ends of the flexible bowing strip in a direction apart from one another; the forces in the bowing strip biasing the first and second separate ends of the bowing strip apart applying tension to the fabric closure panel tending to maintain the fabric closure panel flat.