Venetian blind

Claim 1

A VENETIAN BLIND COMPRISING AN OPERATING SHAFT WHICH IS ROTATABLE AND SIMULTANEOUSLY AXIALLY DISPLACEABLE FOR WINDING AND UNWINDING THEREON A LIFT CORD MEANS FOR RAISING AND LOWERING THE SLATS OF THE BLIND, A LADDER CARRIER MEMBER RESILIENTLY GRIPPING THE SURFACE OF SAID SHAFT WITH A FRICTIONAL FIT THEREBETWEEN, SAID CARRIER MEMBER HAVING LADDER MEANS SECURED THERETO FOR TILTING THE SLATS OF THE BLIND PURSUANT TO ROTATION OF SAID MEMBER, A RADIALLY PROTRUDING ABUTMENT MEANS INTEGRAL WITH SAID MEMBER, A FIRST FIXED ABUTMENT MEANS LOCATED IN THE ROTATIVE PATH OF THE RADIALLY PROTRUDING ABUTMENT MEANS AND ENGAGEABLE THEREWITH FOR STOPPING ROTATION OF SAID CARRIER MEMBER IN EITHER OF OPPOSITE DIRECTIONS, A SECOND FIXED ABUTMENT MEANS COMPRISING A PARTITION AND A WALL MEMBER RESPECTIVELY FACING THE RESPECTIVE OPPOSITE AXIAL ENDS OF SAID CARRIER MEMBER AND ENGAGEABLE THEREWITH FOR RESTRICTING AXIAL MOVEMENT OF SAID MEMBER IN EITHER AXIAL DIRECTION, SAID FIRST AND SECOND FIXED ABUTMENT MEANS COMPRISING A UNITARY ASSEMBLY OF PARTS WITH SAID FIRST ABUTMENT MEANS EXTENDING AXIALLY BETWEEN SAID PARTITION AND A WALL MEMBER AND BEING CONNECTED THERETO, THE FRICTIONAL FIT BETWEEN SAID MEMBER AND SAID SHAFT BEING SUCH THAT SAID SHAFT CAN ROTATE AND MOVE AXIALLY INDEPENDENTLY OF SAID CARRIER MEMBER WHEN THE LATTER IS STOPPED BY VIRTUE OF SAID MEMBER ENGAGING SAID FIXED ABUTMENT MEANS, AND SAID FRICTIONAL FIT BEING SUCH THAT SAID MEMBER IS CARRIED ALONG BY SAID SHAFT WHEN SAID MEMBER IS FREE OF SAID FIRST FIXED ABUTMENT MEANS.