| 摘要 |
An assembled overhead door unit for hanging from a door frame defining a doorway and including a door panel having respective door mounting brackets secured to opposite sides thereof. First and second pairs of hinge arms are pivotably connected on their respective lower ends to the respective mounting brackets and project upwardly therefrom. A pair of frame mounting brackets are pivotably carried from the upper extremities of the respective hinge arms and respective tension springs are provided for connection between the respective hinge and door brackets for biasing such brackets toward one another. Connecting means is provided for releasably connecting the hinge and door brackets together in affixed relationship whereby the door unit may be positioned in such doorway, the frame brackets mounted to the door frame and the connecting means then released to free the door unit for operation.
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