초록 ▼

An improved door structure and the method for forming such structure is disclosed. Individual rectangular door panels are formed from glass fiber reinforced plastic with a lip along at least one exterior edge for abutting a surface against which the door panel seals when the door is closed. A seal i

An improved door structure and the method for forming such structure is disclosed. Individual rectangular door panels are formed from glass fiber reinforced plastic with a lip along at least one exterior edge for abutting a surface against which the door panel seals when the door is closed. A seal is attached to the door panel adjacent the lip for resiliently engaging the abutting surface. Internal wood and prestressed steel reinforcement strips extend along at least the long sides of the door panels to prevent the door panels from twisting or sagging. The interior of the door panel is reinforced with a honeycomb formed from a resin impregnated corrugated cardboard. Voids in the honeycomb may be filled with solid or particulate insulation.

대표청구항 ▼

An improved flat rectangular door panel having two side surfaces, two long edge surfaces and two short edge surfaces comprising a flat rectangular honeycomb core having two long edges and two short edges, two flat steel strips extending perpendicular to said side surfaces, one of said strips abuttin

An improved flat rectangular door panel having two side surfaces, two long edge surfaces and two short edge surfaces comprising a flat rectangular honeycomb core having two long edges and two short edges, two flat steel strips extending perpendicular to said side surfaces, one of said strips abutting each long edge on said core, a wood frame enclosing said core, said wood frame abutting said steel strips and said short core edges, and a molded synthetic resinous material defining said panel surfaces and bonded to said wood frame, said steel strips and said honeycomb core, said molded synthetic resinous material stressing said steel strips.