Torsion bar suspension for motor vehicles

Claim 1

A VEHICLE SUSPENSION SYSTEM HAVING SPRUNG AND UNSPRUNG PARTS, A TORSION BAR INTERPOSED BETWEEN SAID PARTS, THE ENDS OF SAID BAR BEING SECURED TO THE SPRUNG AND UNSPRUNG COMPONENTS RESPECTIVELY SO THAT SAID BAR IS STRESSED WHEN THE UNSPRUNG COMPONENTS TRAVERSE A JOUNCE AND REBOUND PATH, SAID BAR HAVING A GENERALLY U-SHAPE AND COMPRISING A PAIR OF LEG PORTIONS AND AN INTEGRAL U-SHAPED PORTION CONNECTING SAID LEG PORTIONS, SAID LEG PORTIONS HAVING A CIRCULAR CROSS SECTION, THE MIDPORTION OF SAID UPORTION HAVING A NONCIRCULAR CROSS SECTION WITH A MAJOR AXIS PERPENDICULAR TO A PLANE CONTAINING THE SAID LEG PORTIONS AND WITH A DIMENSION ALONG SAID MAJOR AXIS THAT IS GREATER THAN THE DIAMETER OF THE CIRCULAR CROSS SECTION, THE DIMENSION OF SAID MIDPORTION ALONG A MINOR AXIS PERPENDICULAR TO SAID MAJOR AXIS BEING LESS THAN SAID DIAMETER, THE CONFIGURATION OF THE BAR AT THE INTEGRAL U-SHAPED PORTION BLENDING SMOOTHLY FROM THE CIRCULAR CROSS SECTION WHERE IT IS JOINED WITH THE LEGS TO THE NONCIRCULAR CROSS SECTION AT ITS MIDPOINT.