An apparatus for automatically controlling the elevation adjustment of car bodies

Claim 1

A CONTROL SYSTEM FOR USE IN AN AUTOMOBILE HAVING A BODY AND FRONT AND REAR AXLE MEANS EACH HAVING A PAIR OF WHEELS THEREON, COMPRISING SEPARATE HYDRO-PNEUMATIC SUSPENSION UNITS ASSOCIATED WITH EACH OF SAID WHEELS FOR SUPPORTING SAID BODY RELATIVE TO SAID AXLE MEANS, AND A CONTROL ELEMENT OPERATIVELY ASSOCIATED WITH EACH AXLE MEANS, CONDUIT MEANS OPERATIVELY CONNECTING EACH CONTROL ELEMENT WITH THE SUSPENSION UNITS OF A RESPECTIVE AXLE MEANS, PRESSURE OIL SUPPLY MEANS OPERATING CONTINUOUSLY DURING OPERATION OF THE AUTOMOBILE, SECOND CONDUIT MEANS INTERCONNECTING SAID PRESSURE OIL SUPPLY MEANS AND SAID CONTROL ELEMENTS IN SERIES TO FORM AN OIL CIRCUIT WHEREIN THE OIL FLOWS FROM SAID PRESSURE OIL SUPPLY MEANS CONTINUOUSLY DURING OPERATION THEREOF TO ONE OF SAID CONTROL ELEMENTS AND THEN TO THE OTHER OF SAID CONTROL ELEMENTS AND BACK TO SAID PRESSURE OIL SUPPLY MEANS, EACH OF SAID CONTROL ELEMENTS NORMALLY ALLOWING UNIMPAIRED FLOW OF OIL THROUGH SAID CIRCUIT AND INCLUDING MEANS FOR SELECTIVELY BLOCKING THE FLOW OF OIL THROUGH SAID CIRCUIT AND FOR SELECTIVELY PASSING THE OIL TO THE SUSPENSION UNITS ON A RESPECTIVE ONE OF SAID AXLE MEANS AND THE DISCHARGE OF OIL FROM SAID LAST-MENTIONED SUSPENSION UNITS, AND MEANS FOR CONTROLLING SAID MEANS FOR SELECTIVELY BLOCKING THE FLOW OF OIL IN ACCORDANCE WITH THE DISTANCE BETWEEN SAID BODY AND SAID RESPECTIVE ONE OF SAID AXLE MEANS.