Patent ID: 7588045
Filing Date: 2009-09-15
Classification: E04H

Abstract:
1. A collapsible structure including a door mechanism, comprising: a collapsible structure including an entranceway formed in a wall of the collapsible structure; and a fan-shaped door including a flexible sheet of material configured to extend across the entranceway of the collapsible structure and being configured to move between an open position and a closed position with curvilinear motion, the fan-shaped door connected to the collapsible structure at an attachment point; the fan-shaped door so characterized in that movement of the fan-shaped door between the open position and the closed position includes radial movement of the fan-shaped door pivoting about the attachment point; a first reinforcement member coupled to the fan-shaped door, the first reinforcement member extending across the flexible sheet of material from the attachment point; a second reinforcement member coupled to the fan-shaped door, the second reinforcement member extending across the flexible sheet of material from the attachment point wherein the first reinforcement member and the second reinforcement member radiate outward from the attachment point at an angle to one another; and wherein the collapsible structure includes a double-layered wall including a first layer of material and a second layer of material, wherein the fan-shaped door is positioned between the first layer of material and the second layer of material of the double-layered wall.