Roll-up door assembly for vehicles

Claim 1

A roll-up door assembly for vehicles comprising a. a pair of spaced apart track members extending upright through a portion of their length and at their upper ends extending into a curved portion, b. said track members having opposed channel portions forming trackways, c. a door having top and bottom ends and side edges, d. said door comprising a plurality of individual horizontal sections each having top and bottom laterally extending tubular portions, e. said tubular portions being open at the side edges thereof, f. said top tubular portions having a top longitudinal slot therein and said bottom tubular portions having a bottom longitudinal slot therein, g. and a plurality of hinge members, h. said hinge members comprising a one-piece molded construction having a flat body portion and a pair of parallel cylindrical portions along opposite sides thereof, i. said cylindrical portions being engaged rotatably in top and bottom tubular portions of adjacent door sections through the side edge openings of said tubular sections with said body portion projecting through said slots whereby to connect said door sections hingedly together for movement in the track members, j. and a head portion on the other end of each of said cylindrical portions, k. said head portions projecting beyond the side edges of the door sections in the engaged position of said hinge members in said tubular portions of adjacent door sections and extending freely and slidably into the channel portion of said track members for guiding and supporting said door sections in said track members, l. the door being of a selected widtH and said head portions projecting a selected amount relative to the distance between said track members whereby the door is maintained against lateral displacing movement in said track members, m. the body member of said hinge members having a width such that the interconnected door sections are spaced apart to form a vertical air space therebetween, n. said hinge members being of a length to extend only part way through the width of the door sections from the sides whereby said air spaces are provided throughout a major portion of the width of said door.