Venetian Blinds with Single Spring Loaded Lift

摘要

Venetian blinds include a pair of slat lift and guide tapes (27, 28) that extend from the upper rail (12), downwardly through openings (22) in the elongated parallel slats (14) and into the lower rail (13) where they are collected in the lower rail on spools (48). The lift and guide tapes are concave in cross section when in their rectilinear shape and progressively change to flat in cross section as they are pulled into the lower rail and wrapped about tape collector spools.

主权项

1. A Venetian blinds assembly for hanging at a window opening, comprising:
an upper rail for mounting above a window opening, a lower rail positioned below the upper rail, a plurality of elongated parallel slats positioned between the upper rail and the lower rail and extending parallel to the upper rail, the parallel slats each including a pair of slat openings extending there through, the pairs of slat openings of the slats positioned in alignment with the slat openings of adjacent slats, a pair of concave slat lift and guide tapes each including a distal end portion and a proximal end portion, the distal end portion of the concave slat lift and guide tapes being supported by the upper rail, and the proximal end portion of the concave slat lift and guide tapes being suspended downwardly from the upper rail to the lower rail, a control rod extending along the lower rail, tape collectors mounted on the control rod in alignment with the concave slat lift and guide tapes, the slat lift and guide tapes wound in flat spiral layers about the tape collectors, the tape collectors being rotatable in unison about the control rod, and the flat spiral layers of the slat lift and guide tapes being slidable with respect to one another to change the length of the lift and guide tapes extending from the lower rail to the upper rail.