| 摘要 |
<p>Architectural covering (1) having a plurality of adjustable and retractable slats (3). The architectural covering includes a fixed stationary rail (5) at one end of the plurality of slats, a movable rail (7) at an opposite end of the plurality of slats and movable to and from the fixed rail to create extended and retracted positions of the architectural covering, at least one continuous drive cord (9) arranged in a closed loop with both its opposite ends attached to the movable rail, at least one fixed cord return guide (13) adapted to being stationary mounted in a plane extending through the fixed rail, the plurality of slats and the movable rail, and in a location spaced from the fixed rail and beyond the movable rail to an extent determined by a maximum extension required for the covering, at least one drive spool (17) adapted to be selectively rotatable in opposite directions of rotation, the at least one continuous drive cord being wrapped about the at least one rotary drive spool to establish a driving engagement, the at least one drive cord extends from the at least one rotary drive spool towards the movable rail, from there towards the at least one fixed cord return guide and and back to the at least one rotary drive spool, an adjusting mechanism for adjusting the plurality of slats and a drive shaft for rotatably driving the adjusting mechanism slectively in opposite directions, the adjusting mechanism being adapted to rotatably engage the drive spool. A lost motion drive connection is operatively included between the adjusting mechanism and the at least one drive spool.</p> |
