Patent ID: 7063122

Claim:
A covering for an architectural opening comprising: a headrail, a bottom rail, an intermediate rail, blind material interconnecting said bottom and intermediate rails, said blind material having a plurality of horizontally disposed slats that are pivotal about longitudinal axes when said blind material is moved between open and closed positions, a control system in said headrail operably connected to said intermediate rail to raise and lower said intermediate rail relative to said headrail, and a counterbalanced system operably interconnecting said headrail and bottom rail to selectively permit movement and positioning of said bottom rail relative to said headrail whereby the spacing between said intermediate rail and said bottom rail is adjustable to extend or retract said blind material, and wherein said counterbalanced system includes a spring and a lift cord system, said lift cord system interconnecting said bottom rail with said spring such that said spring substantially offsets the weight of said bottom rail so that said bottom rail can be movably positioned at any selected position across said architectural opening.