Patent ID: 7331370

Claim:
A window covering assembly capable of maintaining a selected position without requiring manipulation of cords, buttons or other locking mechanisms, the window covering assembly comprising in combination: a window covering; a top rail at an upper end of said window covering, said top rail adapted to be attached to a casing adjacent a window; a bottom rail at a lower end of said window covering; a cord; a cord collector, said cord collector coupled to one of said rails; said cord extending between said cord collector and one of said rails spaced from said cord collector; a biaser coupled to said cord collector, said biaser adapted to bias said cord collector toward having more cord collected with said cord collector; a progressive resister coupled to said cord collector; said progressive resister adapted to provide greater resistance to motion of said bottom rail and cord collection by said cord collector when said bottom rail is in a first lower position than when said bottom rail is in a second higher position above said first lower position; and said cord collector adapted to rotate, said progressive resister including a threaded shaft coupled to said cord collector and adapted to rotate with said cord collector, said progressive resister including a key with a threaded hole adapted to ride along said threaded shaft, said key adapted to add resistance to cord collector rotation when said cord collector rotates to a position with less cord collected thereon.