Balancing mechanisms for furniture

Claim 1

A BALANCING MECHANISM CONSISTING, IN COMBINATION, ESSENTIALLY OF A BASE STRUCTURE, AN ARM STRUCTURE, AND A MOVABLE BODY, SAID ARM STRUCTURE BEING ROTATABLY CONNECTED AT ITS ONE END ABOUT A FIRST AXIS TO SAID BASE STRUCTURE AND AT ITS OTHER END ROTATABLY CONNECTED ABOUT A SECOND AXIS TO SAID BODY, SAID FIRST AXIS BEING PARALLEL TO SAID SECOND AXIS, SAID ARM STRUCTURE SUPPORTING SAID BODY AT A VARIABLE HEIGHT AND VARIABLE ANGLES OF INCLINATION, SAID BALANCING MECHANISM INCLUDING ALSO A FIRST AND SECOND SPRING MEANS, A FIRST CO-ACTING MEANS CONNECTED TO THE ONE OPERATIVE END OF SAID FIRST SPRING MEANS FOR BALANCING SAID ARM STRUCTURE AND SAID BODY FOR ROTATION ABOUT FIRST AXIS, A SECOND CO-ACTING MEANS CONNECTED TO THE ONE OPERATIVE END OF SAID SECOND SPRING MEANS FOR BALANCING SAID BODY FOR ROTATION ABOUT SAID SECOND AXIS, AT LEAST ONE OF SAID CO-ACTING MEANS COMPRISING ESEENTIALLY LEVER MEANS AND CAM MEANS HAVING A NON-CIRCULAR WORKING SURFACE OPERATIVELY ENGAGED THEREWITH.