Abstract: A venetian blind includes a multiplicity of horizontal slats arranged in vertically spaced relation below a head box. The head box is of a rectangular tubular construction composed of elongate support and cover bars. The support bar includes at least a front side wall and a lower wall, and the cover bar is attached to the support bar in covering relation to an open side of the support bar. The head box accommodates therein a slat tilt adjustment device for adjusting the angle of tilt of the slats.

Abstract: A device for assembling the blinds comprising a supporter to which a plurality of the bridges are provided, one pair of which comprising movable and stational ones for receivably sandwiching slat.The device further has a plurality of triangle guide members, each having an arm projecting and another having a notch for receiving said arm to form a through elongated opening for passing the slat therethrough. The center line of the elongated opening of the guide and the pair of the bridges of the support coincides for the easiest insertion of the slat through the guide to the bridges, with the simple and quick manual operation or electrically operation, as the case may be.