Patent ID: 7100664

Claim:
A blind slat control mechanism, including a Venetian blind having a pair of first rope ladders mounted between an upper and a lower beam and a plurality of slats to be sequentially led there-through and equidistantly abutted against for location thereby, and the upper ends of the first rope ladders are wound through adjustment rollers of mounting seats adapted at both inner lateral sides of the upper beam to control the rotation of the slats in different angles thereby; at least one pull cord, led through cord-passage holes of each slat, is wound and extended downwards from a pulley seat mounted at one end of the upper beam to control the folding or unfolding operation of the slats thereby; the present invention being characterized by that, a sliding guide plates each being disposed at repective sides of each mounting seat inside the upper beam thereof, and two linkage holes and a driving hole being disposed at preset spots of the sliding guide plate thereon for a second rope ladder and a driving cord to be fixedly attached thereto respectively; the second rope ladder, led through rope-passage holes of the mounting seat thereof, being stretched downwards to bestride the bottommost slat thereof in a U-shaped form and equipped with a plurality of positioning steps alternatively astride the slats in odd or even number; a pivoting hole being disposed at the other end of the upper beam for the driving cord led through the inner side of the upper beam to pass there-through and suspend downwards there-from; thus, via the linkage operation of the sliding guide plates with both the second rope ladders and the driving cord fixedly attached thereto, the driving cord is pulled to actuate the movement of the sliding guide plates and synchronically draw upwards the alternate slats supported by the second rope ladders therewith for adjusting the light coming into a room, effectively avoiding the slant of the slats due to uneven pulling force applied thereto; the pull cord and the driving cord are individually mounted at opposite ends of the upper beam thereof.