| 摘要 |
An operating mechanism for an overhead door has a drive pulley mounted on the door. A drive motor is coupled to the pulley. An arm pivotally mounted on the door extends from the upper portion of the door generally in the direction of opening movement of the door. A guide cable is mounted on the end of the arm. A drive cable strung above the door extends in a path from the front of the building, around the guide pulley, around the drive pulley, and over the guide pulley to the rear of the building. The guide pulley prevents contact between the top of the door and the cable. The drive motor may be movably mounted in the operating mechanism for performing a variety of control functions. |
