Patent ID: 7296606
Filing Date: 2007-11-20
Classification: E06B

Abstract:
1. A Venetian blind slat control mechanism, wherein a set of first string ladders are suspended between a head rail and a bottom rail of a Venetian blind for holding a plurality of equally spaced slats in abutting location thereon, and at both ends inside the head rail thereof is respectively disposed an adjusting seat with an adjusting shaft mounted thereon to tilt the slats into different angles thereby; a lift cord is configured to be sequentially threaded through cord passages of each slat and wound through a first pulley seat adapted at one end of the head rail therein and suspended downwards there-from so as to raise or lower the slats thereby in the collecting or expanding operation thereof; a positioning seat is mounted between the adjusting seats thereof inside the head rail, and a set of guide sliding members is situated at both sides of the positioning seat wherein the upper edge of each guide sliding member is securely engaged with a linkage actuating plate controlled by an operational cord; a set of second string ladders whose upper ends are respectively fixed to the guide sliding members thereof are mounted to extend downwards in a U-shaped form to cross the bottom rail, and multiple positioning steps of the second string ladder are configured to hold in place alternately every even/odd-numbered slats thereby; the operational cord fixedly attached to a positioning cord hole of the linkage actuating plate is guided along from one end of the head rail to wind around a second pulley seat disposed at the other end of the head rail and suspend downward there-from; the operational cord drawn to trigger the movement of the linkage actuating plate and synchronically actuate both guide sliding members that lift upwards the second string ladders with each odd/even-numbered slat raised therewith to abut against the immediate upper slat respectively in pairs; wherein the lift cord and the operational cord are separately mounted at both opposite ends of the head rail respectively.