| 摘要 |
A door control mechanism for controlling the movement of a sectional door between the closed position and the open position thereof wherein the door is biased towards the closed position thereof, the mechanism accommodating manual movement of the door to the open position followed by an automatic movement of the door to the closed position followed by an automatic movement of the door to the open position and then followed by manual movement of the door to the closed position, the mechanism including a first latch having a door-holding condition for holding the door in its open position and having a door-releasing condition for releasing the door and allowing it to move to the closed position thereof, a second latch mechanism having a device-connecting condition for connecting an energy-storing device to the door thereby automatically to move the door to the open position thereof, and having a device-holding condition for maintaining the energy-storing device out of operative connection with the door, a trigger for selectively operating the first and second latch mechanisms, and a selector for selectively rendering the trigger operable to change the condition of only one of the first and second latch mechanisms at one time.
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