Heavy-duty vehicle seat

Claim 1

A CUSHIONING PEDESTAL SUPPORT FOR SEATS COMPRISING: A CYLINDER HAVING A CLOSED BOTTOM INCLUDING BASE MEANS FOR MOUNTING THE SAME ON A SUPPORTING SURFACE WITH THE CYLINDER PROJECTING VERTICALLY UPWARDLY THEREFROM AND HAVING AT ITS UPPER END A RADIALLY INWARDLY PROJECTING ANNULAR CYLINDER HEAD; AND A PISTON UNIT INCLUDING AN ANNULAR PISTON SLIDABLE WITHIN AND SEALED TO THE INNER WALL OF SAID CYLINDER AND A TUBULAR CONNECTING ROD PROJECTING UPWARDLY FROM SAID PISTON AND THROUGH SAID CYLINDER HEAD AND HAVING AT ITS UPPER END A HEAD FOR SUPPORTING A SEAT, A ROAD SHOCK CUSHIONING CHAMBER BEING DEFINED WITHIN SAID CONNECTING ROD BETWEEN SAID CONNECTING ROD HEAD AND SAID CLOSED BOTTOM, AND AN ANNULAR REBOUND-CHECKING PNEUMATIC CHAMBER BEING DEFINED BETWEEN SAID CONNECTING ROD AND SAID CYLINDER AND BETWEEN SAID CLOSED BOTTOM AND SAID CYLINDER HEAD; SAID CUSHIONING SUPPORT FURTHER INCLUDING A PAIR OF PARALLEL, LATERALLYSPACED GUIDE STUDS SECURED TO SAID BASE MEANS AND A PAIR OF BEARING SLEEVES SECURED TO THE PISTON UNIT AND SLIDABLY RECEIVING SAID STUDS TO HOLD SAID CYLINDER AND PISTON UNIT AGIANST RELATIVE ROTATION ABOUT SAID MAJOR AXIS WHILE PERMITTING FREE VERTICAL MOVEMENT OF SAID CYLINDER RELATIVE TO THE PISTON UNIT.