US Patent 7448401 Erectable canopy with reinforced roof structure

The lightweight erectable canopy includes a plurality of legs connected together by an extendible perimeter assembly of link members. In one embodiment, the roof structure is formed by a pole members pivotally mounted to the upper ends of the legs so as to extend across the shelter, and movable between a lowered position and a raised, upwardly arching position. Corner support strut members are pivotally mounted to the legs, to be rotatable upwardly to engage and support the pole members.