US Patent 7299852 Vertical blind that is expanded and folded quickly and conveniently

A vertical blind includes a headrail, a fixing bracket, a plurality of juxtaposed movable brackets, a drive bracket, a plurality of driven blocks, a plurality of drive blocks, a plurality of mounting seats, a plurality of shades, a pull cord unit, and a positioning unit. Thus, the vertical blind contains multiple movable brackets movable between the fixing bracket and the drive bracket, so that the length of the vertical blind is expanded freely to fit the size of the window, thereby enhancing the versatility of the vertical blind. In addition, the mounting seats have different lengths corresponding to the positions of the fixing bracket and the movable brackets, so that the movable brackets are movable smoothly without interfering with each other, thereby facilitating operation of the vertical blind.