Vertical venetian blind

Claim 1

A VERTICAL VENETIAN BLIND COMPRISING AN ELONGATED HORIZONTAL SUPPORT MEMBER, AN ELONGATED HORIZONTAL ARM PIVOTALLY ATTACHED TO SAID SUPPORT MEMBER FOR ROTATION ABOUT A HORIZONTAL AXIS, A PLURALITY OF SPACED APART RIGHT ANGLE ACTUATING MEMBERS EACH HAVING A FIRST LEG ROTATABLY MOUNTED ON SAID PIVOTING ARM AT AN ACUTE ANGLE TO SAID HORIZONTAL AXIS WITH THE RIGHT ANGLE INTERSECTION OF EACH OF SAID ACTUATING MEMBERS LYING SUBSTANTIALLY ON SAID HORIZONTAL AXIS, MEANS FOR RESTRICTING MOVEMENT OF THE SECOND LEG OF SAID ACTUATING MEMBERS TO RESPECTIVELY DESCRIBE THE SURFACE OF A SEGMENT OF A RIGHT CIRCULAR CONE HAVING THEIR AXES IN A COMMON PLANE FIXED WITH RESPECT TO SAID SUPPORT MEMBER AND CONTAINING SAID HORIZONTAL AXIS AND PASSING THROUGH THE RIGHT ANGLE INTERSECTION OF ACTUATING MEMBERS UPON ROTATION OF EACH OF SAID FIRST LEGS, MEANS FOR SELECTIVELY PIVOTING SAID PIVOTING ARM, VERTICAL SEGMENTED LOUVERS ACTUATED BY SAID ACTUATING MEMBERS WHEREBY UPON PROPER PIVOTING OF SAID PIVOTING ARM EACH OF SAID VERTICAL LOUVERS ARE ROTATED FOR OPENING AND CLOSING THE BLIND, EACH LOUVER HAVING A FIRST SEGMENT COUPLED TO EACH OF SAID SECOND LEGS OF SAID ACTUATING MEMBERS, A SERIES OF INTERFITTING SEGMENTS FOR EACH LOUVER WITH EACH SEGMENT OF A HEIGHT SUBSTANTIALLY IDENTICAL TO THE HEIGHT OF SAID FIRST SEGMENT, ONE SEGMENT OF EACH OF SAID SERIES SLIDABLY MOUNTED ON EACH OF SAID FIRST SEGMENTS, EACH SEGMENT OF THE REMAINDER OF SAID SERIES OF SEGMENTS SLIDABLY MOUNTED ON ITS ADJOINING UPPER SEGMENT, COOPERATING MEANS ADJACENT TOP AND BOTTOM EDGES OF SAID SEGMENTS TO RETAIN SAID FIRST SEGMENT AND SAID SERIES OF SEGMENTS IN FULLY EXTENDED POSITION, MEANS FOR RAISING THE LOWERMOST SEGMENT OF EACH OF SAID LOUVERS FOR SLIDING SAID SEGMENTS ALONG ADJOINING SEGMENTS IN SEQUENCE FROM THE LOWERMOST SEGMENT UPWARDLY SO THAT THE VENETIAN BLIND CAN BE COLLAPSED TO A LENGTH OF A SINGLE SEGMENT.