Counterbalancing hinge mechanism

Claim 1

A HINGE MECHANISM FOR A CLOSURE MEMBER SWINGABLE TO CLOSE A VEHICLE BODY OPENING COMPRISING A HINGE PIN JOURNALED WITHIN THE VEHICLE BODY EXTENDING PARALLEL TO ONE EDGE AND LATERALLY OF AN ADJACENT CORNER OF THE CLOSURE OPENING, A HINGE MEMBER DRIVINGLY SECURED TO THE END OF THE HINGE PIN LATERALLY INWARDLY OF THE ADJACENT CORNER OF THE BODY OPENING AND MOUNTABLE ON THE CLOSURE MEMBER FOR PIVOTAL SWINGING MOVEMENT ABOUT THE JOURNALLED AXIS OF THE HINGE PIN BETWEEN FULLY OPENED AND CLOSED POSITIONS OF THE CLOSURE MEMBER, CAM MEANS INCLUDING A CAM MEMBER DRIVINGLY SECURED TO THE HINGE PIN LATERALLY OUTWARDLY OF SAID BODY OPENING CORNER FOR PIVOTAL ROTATION THEREWITH AND HAVING AN ARCUATE CAM SURFACE OF VARIED RADIAL DIMENSION ABOUT THE JOURNALLED AXIS OF THE HINGE PIN, SPRING MEANS MOUNTED WITHIN THE VEHICLE BODY LATERALLY OUTWARD OF SAID BODY OPENING CORNER AND OPERABLY CONNECTED THROUGH SAID CAM MEMBER AND HINGE PIN AND TENDING TO BIAS THE CLOSURE MEMBER IN A CLOSURE OPENING DIRECTION, AND SAID SPRING MEANS INCLUDING A FLEXIBLE MEMBER CONNECTED TO A REDUCED RADIUS END OF THE CAM SURFACE AND PROGRESSIVELY ENGAGEABLE WITH INCREASING RADIAL DIMENSIONING OF THE CAM SURFACE DURING CLOSING MOVEMENT OF THE CLOSURE MEMBER AND NORMALLY COOPERATING THEREWITH DURING CLOSURE OPENING MOVEMENT TO MODIFY THE EFFECTIVE TORQUE ARM OF THE SPRING MEANS TO THEREBY VARY THE COUNTERBALANCING TORQUE APPLIED TO THE HINGE PIN AND HINGE MEMBER IN ACCORDANCE WITH THAT REQUIRED TO MAINTAIN THE OPENED CLOSURE MEMBER BETWEEN ITS CLOSED AND FULLY OPENED POSITIONS.