US Patent 11242712 Vertical blinds

A vertical blind structure has: an upper track, at least one track set and a plurality of blades. The upper track with an adjustable length has an inner track and an outer track, and the inner track and the outer track are disposed on a same side and connected to each other with a connecting track. The inner and outer tracks of the upper track respectively have an engaging portion and further have a plurality of clamping members. The at least one track set has a plurality of sliding tracks parallel with each other, and each sliding track has a positioning groove and a corresponding limiting groove at two opposite sides and a storing groove at a bottom side. An end of each positioning groove of the sliding track comprises a sliding block.