Variable motion vibrating screen

Claim 1

A SEPARATOR COMPRISING, IN COMBINATION: A SCREEN-LIKE MEMBER, A SUPPORT FOR THE MEMBER, AN ARRANGEMENT FOR ENABLING THE MEMBER TO HAVE OSCILLATING MOTION RELATIVE TO THE SUPPORT THROUGH MOVEMENT HAVING VERTICAL AND HORIZONTAL COMPONENTS, SAID ARRANGEMENT COMPRISING, A LINKAGE CONNECTED WITH SAID MEMBER, A DRIVE FOR ACTUATING SAID MEMBER, STRUCTURE FOR CONTROLLING THE OSCILLATING MOTION OF THE MEMBER, SAID STRUCTURE COMPRISING, ELONGATE TORSION BAR MEANS HAVING THE END PORTIONS THEREOF ROTATABLE RELATIVE TO THE SUPPORT, SAID END PORTIONS OF THE TORSION BAR MEANS BEING CONNECTED WITH SAID LINKAGE AND MOVABLE THEREWITH WHEN SAID MEMBER IS ACTUATED BY SAID DRIVE, AND A DEVICE DISPOSED INTERMEDIATE THE END PORTIONS OF THE TORSION BAR MEANS AND CONNECTED WITH SAID SUPPORT FOR INITIALLY ROTATABLY POSITIONING THE TORSION BAR MEAN TO VARY THE COMPONENTS OF THE OSCILLATING MOTION OF THE MEMBER WHILE RESTRAINING THE INTERMEDIATE PORTION OF THE TORSION BAR MEANS AGAINST ROTATION DURING SUCH OSCILLATING MOTION.