Patent ID: 6938663

Claim:
A blind structure comprising: a) an upper beam; and b) a blind body connected at an upper edge thereof to the upper beam and having: i) a plurality of elongated passages spaced apart on the blind and extending across a width of the blind body, the plurality of elongated passages including a bottom most passage located nearest a bottom edge of the blind and a plurality of upper elongated passages located between the upper beam and the bottom most passage; ii) a buckling piece connected to a center of the bottom most passage; and iii) a plurality of buckling rings, one buckling ring of the plurality of buckling rings being connected to a center of each of the plurality of upper elongated passages and aligning with the buckling piece, wherein the blind body is movable between extended and retracted positions, in the retracted position the buckling piece is connected to a predetermined number of the plurality of buckling rings, and in the extended position the buckling piece is disconnected from the plurality of buckling rings.