Patent ID: 7159636

Claim:
A slat control mechanism for Venetian blinds, including a control assembly, guide sliding assemblies, a linkage drawing plate, and abutting members wherein first rope ladders are suspended between upper and lower beams of a Venetian blind for an abutting position of a plurality of slats each having an adjusting rod attached thereto, are adapted at both inner sides of the upper beam so as to tilt the slats into different angles thereby; a lift cord, threaded through each slat and fixedly attached to the lower beam at the bottom end thereof, the lift card being threaded through a pulley seat adapted at one end of the upper beam and extends downwards there-from so as to lift or expand the slats, wherein: the guide sliding assembly including a positioning seat and a guide sliding member being adapted at both corresponding sides of two adjusting seats thereof respectively; the control assembly including a fixing mount, a control member, and a retaining member being mounted at the other side of one adjusting seat thereof and actuated by an operational cord wound around a roller end of the control assembly opposite to the lift cord of the pulley seat; the linkage drawing plate being respectively connected with the guide sliding members of the guide sliding assemblies thereof and the control member; a second rope ladder, wound and fixed to each guide sliding member thereof, being suspended downwards to run the length of the bottommost slat, the second rope ladder being provided with a plurality of positioning steps to hold in place alternatively every other slat; wherein in operation the slat control mechanism is configured so that via the operational cord, the control member of the control assembly and the guide sliding members of the guide sliding assemblies as well as the linkage drawing plate and the second rope ladders thereof are synchronically actuated.