Pneumatic spring system

Claim 1

A PNEUMATIC SPRING SYSTEM FOR VEHICLES, ESPECIALLY MOTOR VEHICLES, MOUNTED BETWEEN AN AXLE SYSTEM AND A SPRING-SUSPENDED PART OF THE VEHICLE, COMPRISING PNEUMATIC SPRING MEANS INCLUDING A RESILIENTLY WORKABLE HOLLOW PIECE ENCLOSING A FIRST PART OF A COMPRESSED AIR VOLUME, WHEREBY SAID FIRST PART OF SAID COMPRESSED AIR VOLUME UNDERGOES CONTINUOUS CHANGES IN SIZE DUE TO THE WORKING OF THE HOLLOW PIECE IN RESPONSE TO THE SPRING INDUCED TRAVEL BETWEEN THE AXLE SYSTEM AND THE SPRINGSUSPENDED PART OF THE VEHICLE, AT LEAST ONE CHAMBER ENCLOSING A SECOND PART OF SAID COMPRESSED AIR VOLUME AND BEING CONNECTED WITH SAID FIRST PART BY A LINKING APERTURE, VALVE TYPE SHUT-OFF MEANS SUITABLE FOR SEALING SAID LINKING APERTURE, SPRING MEANS NORMALLY BRASING SAID SHUT-OFF MEANS INTO SEALING CONTACT WITH SAID LINKING APERTURE, AND NORMALLY ACTUATED MEANS OPERATIVELY ASSOCIATED WITH THE SHUT-OFF MEANS, MOUNTED BETWEEN THE AXLE SYSTEM AND THE SPRING-SUSPENDED PART, FOR NORMALLY COUNTERACTING THE EFFECT OF SAID SPRING MEANS TO MAINTAIN SAID SHUT-OFF MEANS OUT OF CONTACT WITH SAID LINKING APERTURE, AND CONTROL MEANS ONLY DURING LAST PORTION OF SPRING-INDUCED TRAVEL FOR DEACTIVATING SAID NORMALLY ACTUATED MEANS TO ALLOW SAID SHUT-OFF MEANS TO SEAL SAID LINKING APERTURE WHEREBY DURING FINAL SPRING-INDUCED TRAVEL ONLY THE PRESSURE OF SAID FIRST PART OF SAID COMPRESSED AIR VOLUME WILL CHANGE.