| 摘要 |
<p>An operating system (10) for controllably moving a sectional door (D) betwee n open and closed positions comprising a counterbalancing system (30) having a drive tube interconnected with the sectional door (D) and an operator motor (40) mounted adjacent to the drive tube (31), a drive train interconnecting the drive tube (31) and the operator motor (40) for selectively driving the drive tube (31) for moving the sectional door (D) between the open and close d positions, a coupler (50) in the drive train selectively retractable from a driving position and a remotely-actuated disconnect assembly (60) operativel y attached to the coupler (50), wherein the disconnect assembly (60) retracts the coupler (50), whereby the sectional door (D) may be manually moved towar d either of the open position and the closed position.</p> |
