| 摘要 |
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. |
