| 摘要 |
A venetian blind including at least two vertically-extending slat-supporting ladders, each ladder comprising first and second vertical members connected by a plurality of vertically-spaced cross-rungs, a plurality of horizontally-arranged slats, each slat being supported on one of the cross rungs in each of the ladders and between the first and second vertical members, an adjusting mechanism for commonly pivoting each of the slats about its longitudinal axis by moving the first and second vertical members of the ladders in vertically opposite directions , a vertically-extending auxiliary tilt cord that is adjacent to a first vertical member of a ladder and can be moved upwardly, engaging means, on the auxiliary tilt co rd and the adjacent first vertical member of the ladder, for moving the adjacent first vertical member at an intermediate location along its length upwardly with upward movement of the auxiliary tilt cord, so as to adjust the angular pivot of a section of the cross-rung s connected to the first vertical member above or below the intermediate location. The engaging means includes a guiding loop on the first vertical member, a bead fixed on the auxiliary tilt cord and vertically spaced away from the guiding loop and an engaging collar slidably positioned on the auxiliary tilt cord between the guiding loop and the bead, the auxiliary tilt cord extending through the guiding loop, the bead being adapted to engage the engaging collar and thereafter move the engaging collar toward the guiding loop when the auxiliary tilt cord is moved upwardly and the engaging collar being adapted to engage the guiding loop when the auxiliary tilt cord is moved further upwardly. The venetian blind including manipulating means for moving the auxiliary tilt cord upwardly which comprises a winding drum, attached to the auxiliary tilt cord , for winding the auxiliary tilt cord only after the adjusting mechanism has moved the first and second vertical members of the ladders in v ertically opposite directions.
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