Seats for vehicles

Claim 1

IN A RESILIENT SUSPENSION SYSTEM FOR A VEHICLE SEAT, THE COMBINATION WITH A FIXED SUPPORT, AND PAIRS OF LINKS ON OPPOSITE SIDES OF THE SEAT HAVING FIRST AND SECOND PIVOT CONNECTIONS WITH SAID SUPPORT AND SEAT, RESPECTIVELY, AND FORMING THEREWITH PARALLELOGRAMS SWINGABLE ABOUT SAID FIRST PIVOT CONNECTIONS, OF ARM MEANS HAVING A FOLLOWER AND BEING PIVOTALLY MOUNTED ON SAID PARALLELOGRAMS INTERMEDIATE SAID PIVOT CONNECTIONS ABOUT AN AXIS PARALLEL TO THE LATTER; A WEDGE ADJACENT AND COOPERATING WITH SAID FOLLOWER; SPRING MEANS BETWEEN AND ANCHORED TO SAID SUPPORT AND ARM MEANS, WITH THE SPRING ANCHORAGE ON SAID ARM MEANS BEING REMOTE FROM THE PIVOT AXIS OF THE LATTER SO THAT SAID SPRING MEANS WILL BACK SAID ARM MEANS WITH ITS FOLLOWER AGAINST SAID WEDGE WITH OPERATIONAL SEAT BALANCING FORCES VARYING WITH THE SEAT LOAD, SAID WEDGE BEING MOUNTED FOR MOVEMENT TRANSVERSELY OF SAID PARALLELOGRAMS FOR SWING RESPONSE OF VARYING AMPLITUDE OF SAID ARM MEANS ABOUT ITS PIVOT AXIS TO A STATIC SEAT LOAD AND ACCORDING VARIATION OF SAID OPERATIONAL SPRING FORCES; AND MEANS FOR ADJUSTING SAID WEDGE IN DIFFERENT TRANSVERSE POSITIONS.