Patent ID: 8887786

Claim:
A covering for an architectural opening, comprising: upper and lower horizontal movable rails arranged with the upper horizontal movable rail located above the lower horizontal movable rail; a first extendable covering material secured to said upper horizontal movable rail such that movement of said upper horizontal movable rail up and down extends and retracts the extendable covering material; first and second upper rail lift cord spools mounted on said upper horizontal movable rail for rotation together; a first counterwrap cord spool mounted on said upper horizontal movable rail for rotation with said first and second upper rail lift cord spools; first and second upper rail lift cords secured to first and second fixed points above said upper horizontal movable rail and to said first and second upper rail lift cord spools, respectively; and a first lower rail cord secured to said first counterwrap cord spool and to said lower horizontal movable rail, said first lower rail cord being counterwrapped onto said counterwrap cord spool such that rotation of said first upper rail lift cord spool in a first direction causes said first and second upper rail lift cords to wind onto the first and second upper rail lift cord spools, respectively, and unwinds said first lower rail cord from the first counterwrap cord spool.