| 摘要 |
A covering for an architectural opening including a first rail, a second rail moveable relative to the first rail, and a lift regulator coupled to the first rail. The lift regulator includes a drag mechanism, and the lift regulator automatically engages the drag mechanism to resist the second rail moving away from the first rail. In addition, the lift regulator automatically disengages the drag mechanism when the second rail moves toward the first rail. |
