Abstract: A roller-hinge unit for a sectional door supported on a pair of tracks, wherein opposed hinge halves on adjacent door panels are joined together by a hinge tube which is constructed of a plastic material and is snapped into position to thereby hingedly connect the two hinge halves together. The hinge tube has a flange at one end and a pair of opposed resiliently deflectable fingers at the other end which, when the tube passes through the hinge halves, snap outwardly to axially hold the two hinge halves and the tube in an axially constrained relationship. A track-engaging roller is mounted on one end of an elongated roller stem which is axially slidably received within the plastic hinge tube so that the roller can undergo at least limited axial movement relative to the hinge halves to compensate for variations in the width between the tracks. The roller is preferably provided with a urethane tread.

Abstract: A bulkhead door assembly mountable within a storage compartment, such as a refrigerated trailer, for dividing the compartment into subcompartments. Tracks are mounted on the opposed sidewalls of the compartment adjacent the upper edges thereof, and a pair of support devices are mounted on the upper corners of the bulkhead door and coact with the tracks. The support devices permit the upper edge of the bulkhead door to be fixedly latched relative to the sidewalls when the bulkhead door is in a lowered position for dividing the compartment. The support devices also hingedly support the bulkhead door to permit it to be swung upwardly about a horizontal axis located adjacent the upper edge thereof for storage in a raised position adjacent the ceiling of the compartment. A pair of releasable lock mechanisms are mounted adjacent the lower edges of the door for securing the door in either the lowered or raised position.