| 摘要 |
A window covering includes an upper rail, a lower rail, a cover curtain, a first pull and a second pull cord assembly, and a brake assembly. The upper rail contains a pull cord control means cooperative with the first pull cord assembly to control movement of the cover curtain, a plurality of rollers and a movable plate on the bottom and an opening on one side. The second pull cord assembly has one end threading through the opening and other end winding on the rollers and threading through the bottom of the lower rail and fasten to the movable plate. The brake assembly is located in the opening to anchor the second pull cord assembly. After the cover curtain has been retracted or extended, the movable plate can be moved to a desired elevation through coupling relationship of the second pull cord assembly to facilitate adjusting of indoor lighting condition.
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