Tandem axle suspension

Claim 1

A TANDEM AXLE SUSPENSION SYSTEM FOR LOAD CARRYING VEHICLES INCLUDING A LOAD CARRYING CHASSIS, TANDEM AXLES POSTIONED TRANSVERSELY ACROSS SAID CHASSIS AND ADAPTED TO ENGAGE WHEELS AT THE OUTER ENDS THEREOF, SAID CHASSIS COMPRISING A SUBSTANTIALLY RECTANGULAR FRAME HAVING A RIGID SUPPORTING FRAME MEMBER FIXEDLY ATTACHED AT ONE END TO EACH OF THE LONGITUDINAL SIDES THEREOF, THE OTHER END OF EACH OF SAID SUPPORTING FRAME MEMBERS EXTENDING BELOW THE LONGITUDINAL SIDES OF SAID RECTANGULAR FRAME AND POSITIONED INTERMEDIATE SAID AXLES, EACH OF SAID AXLES PROVIDED WITH A RIGID UPWARD EXTENSION, EACH OF SAID RIGID UPWARD EXTENSIONS HAVING RESPECTIVE UPPER TORQUE ROD MEANS FLEXIBLY CONNECTED THERETO, SAID RESPECTIVE UPPER TORQUE ROD MEANS BEING FLEXIBLY JOINED AT ONE END THEREOF TO SAID RESPECTIVE RIGID UPWARD EXTENSION AND BEING FLEXIBLY JOINED AT THE OTHER END THEREOF TO SAID CHASSIS INTERMEDIATE SAID AXLES, LOWER TORQUE ROD MEANS FLEXIBLY CONNECTED BETWEEN EACH OF SAID AXLES AND SAID OTHER END OF SAID SUPPORT FRAME, SAID LOWER TORQUE ROD MEANS BEING ESSENTIALLY BELOW THE LEVEL OF SAID RECTANGULAR FRAME AND SAID AXLES, SAID UPPER AND LOWER TORQUE RODS RESISTING TRANSVERSE, LONGITUDINAL AND TORSIONAL LOADS IMPOSED UPON SAID AXLES, EQUALIZING BEAM MEANS EXTENDING LONGITUDINALLY ON EACH SIDE OF SAID CHASSIS, EACH OF SAID EQUALIZING BEAMS BEING RETAININGLY SUPPORTED AT ITS ENDS BY SAID AXLES, BEING SPACEDLY REMOVED FROM SAID LOWER TORQUE RODS, AND FLOATING WITH RESPECT TO SAID CHASSIS, SPRING MEANS INTERPOSED BETWEEN SAID CHASSIS AND SAID EQUALIZING BEAMS, SAID SPRING MEANS BEING AXIALLY COMPRESSIBLE AND CAPABLE OF FLEXURE TO PERMIT SAID BEAMS TO TILT AND FOLLOW THE VERTICAL MOVEMENTS OF SAID AXLES.