Patent ID: 7549455

Claim:
A covering for an architectural opening comprising in combination: a headrail having a roller rotatably mounted therein, a flexible panel including a support structure with upper and lower edges having its upper edge secured to said roller and at least one horizontally extending vane having upper and lower edges, one of said upper and lower edges of said vane being secured to said support structure and the other being free to move vertically, at least one flexible operative element secured to said roller at one location and to said other edge of said at least one vane at another location so that said other edge can be raised and lowered by said operative element, a bottom rail secured to said lower edge of said support structure, and an inhibitor system for preventing downward movement of said support structure upon rotative movement of said roller in a first direction, said inhibitor system including a catch on said head rail and a catch lip on a body secured to said support structure, said body being adapted to be rolled about said roller with said support structure and being unrollable from said roller with said support structure in said first direction of movement of said roller, said catch lip engaging said catch upon a predetermined movement of said roller in said first direction to prevent further downward movement of said bottom rail on said support structure even though said roller continues to move in said first direction.