| 摘要 |
<p>An operating system (10) for controllably moving a sectional door (D) between 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 closed positions, a coupler (50) in the drive train selectively retractable from a driving position and a remotely-actuated disconnect assembly (60) operatively attached to the coupler (50), wherein the disconnect assembly (60) retracts the coupler (50), whereby the sectional door (D) may be manually moved toward either of the open position and the closed position.</p> |
