Abstract: A structure formed by one or more double tube assemblies characterized by a cross-sectional configuration including two circular walls interjoined by two planar walls interconnected with the circular walls substantially at diametrically opposed circumferential locations in the circular walls.

Abstract: A readily assemblable and disassemblable tent, awning or canopy structure including tubular beams, rafters and uprights interconnected by slip fit junction fittings in telescope relation with respect to the beams, rafters and uprights, the improvement comprising a hold down channel assembly mounted on the upright member of the slip fit junction fitting, the channel member assembly including a rod pivotally mounted on the lower end of the channel member, a bail ring mounted on said rod, a strip of webbing attached to the tent, awning or canopy top and wrapped around the rod of the bail ring, and a tie down cable connected to the lower end of the bail for anchoring the tent structure to the ground.

Abstract: Readily assemblable and disassemblable tent, awning and canopy frame structures incorporating conventional slip fit junction elements and beams and rafters of double tube form which enable greater spans between uprights and simplified structures for larger area tent or like frames, the configuration of the double tube beams and rafters being such that the double tube beam, rafter and upright components can be interchanged with single tube beams, rafters and uprights. The unique double tube forms are characterized by a cross-sectional configuration including two circular walls interjoined by two planar walls interconnected with the circular walls substantially at diametrically opposed circumferential locations in the circular walls and by increased strength-to-weight ratios.