| 摘要 |
A window covering includes a first set of lift cords extending from a headrail to middle rail. The first set of lift cords is extendable between the headrail and the middle rail to a predetermined distance, which defines a lowermost position of the middle rail relative to the headrail. The first set of lift cords is also retractable to a wound position for defining an uppermost position of the middle rail. A second set of lift cords extends from the headrail to the bottom rail and is extendable from between the middle rail and bottom rail to define an extended position of window covering material. The predetermined distance that the first set of lift cords may extend is selected to help prevent children from becoming entangled in the first set of lift cords when the middle rail is lowered away from the headrail.
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