Counterbalancing hinge assembly

Claim 1

A HINGE STRUCTURE FOR MOUNTING A CLOSURE MEMBER ON A FIXED SUPPORT MEMBER FOR SWINGING MOVEMENT BETWEEN OPENED AND CLOSED POSITIONS, A HINGE MEMBER ADAPTED TO BE SECURED TO THE CLOSURE MEMBER AND PIVOTALLY CONNECTED TO THE FIXED MEMBER TO SWING THE CLOSURE MEMBER BETWEEN ITS OPENED AND CLOSED POSITIONS ABOUT A FIRST AXIS, A LINK MEMBER PIVOTALLY CONNECTED AT ONE END TO THE FIXED MEMBER ABOUT A SECOND AXIS PARALLEL TO AND SPACED FROM SAID FIRST AXIS, A TORSION BAR ROTATABLY SUPPORTED ADJACENT ONE END THEREOF BY SAID HINGE MEMBER, SAID ONE END HAVING A CRANK ARM EXTENDING TO THE FREE END OF SAID LINK MEMBER AND PIVOTALLY CONNECTED THERETO, THE OTHER END OF SAID TORSION BAR HAVING A SECOND CRANK ARM, MEANS FOR ANCHORING THE SECOND CRANK ARM OF SAID TORSION BAR FOR MOVEMENT WITH SAID CLOSURE MEMBER IN A MANNER TO INCREASE THE TORSIONAL LOADING OF SAID TORSION BAR UPON CLOSING MOVEMENT OF SAID MEMBERS, AND SAID TORSION BAR ACTING BETWEEN SAID MEMBERS TO COUNTERBALANCE THE CLOSURE MEMBER BETWEEN ITS OPENED AND CLOSED POSITIONS.