Resilient suspension system, more particularly for motor vehicle

Claim 1

IN A RESILIENT SUSPENSION SYSTEM, A CUPOLA-SHAPED, RESILIENT FIRST SPRING HAVING A PLANAR BASE SURFACE, A CUPSHAPED FIRST LOAD-APPLYING MEMBER HAVING A CIRCUMFERENTIAL WALL WITHIN WHICH SAID FIRST SPRING IS DISPOSED LIMITING IN OPERATION OUTWARD DEFORMATION OF A PORTION OF SAID FIRST SPRING HAVING SAID PLANAR BASE SURFACE DUE TO COMPRESSION LOADING, A RIGID, FRUSTRO-CONICAL, SECOND LOAD-APPLYING MEMBER HAVING A SMALL END, SAID FIRST SPRING MEMBER HAVING A SURFACE OPPOSED TO SAID SMALL END AND ON WHICH SAID SMALL END BEARS, SAID FIRST SPRING HAVING A DEFORMATION CHARACTERISTIC EXHIBITING MAXIMUM DEFLECTION WITHIN A GIVEN RANGE OF COMPRESSION LOAD VALUES IMPOSED ON SAID SYSTEM AND PROGRESSIVELY DECREASING FLEXIBILITY INCREASING AT COMPRESSION LOAD VALUES CAUSING SAID MAXIMUM DEFLECTION, A COMPRESSION-TYPE SECOND SPRING WITHIN SAID FIRST SPRING EXHIBITING UNDER COMPRESSION LOADS A DEFORMATION CHARACTERISTIC IN WHICH DEFLECTION PROGRESSIVELY INCREASES WITH INCREASED COMPRESSION LOADS AND CEASES TO INCREASE UPON ADDITIONAL INCREASE OF COMPRESSION LOADS PAST A GIVEN VALUE, SAID SECOND SPRING DISPOSED TO COOPERATE WITH SAID FIRST SPRING UPON COMPRESSION LOADING THEREOF AND DISPOSED BETWEEN SAID FIRST LOAD-APPLYING MEMBER AND SAID FIRST SPRING AND DIMENSIONED TO BECOME EFFECTIVE AT A COMPRESSION LOAD VALUE IMPOSED ON SAID SYSTEM LOWER THAN AND CLOSE TO A COMPRESSION LOAD VALUE AT WHICH SAID MAXIMUM DEFLECTION OF SAID FIRST SPRING TAKES PLACE.