Hydraulic shock absorber wheel suspension adjustable for levelling and changing ground clearance of a vehicle

Claim 1

IN COMBINATION, A TRUCK HAVING A BED, A FIXED AXLE SPACED BELOW THE BED, RESILIENT SUSPENSION MEANS CONNECTED TO AND INTERPOSED BETWEEN THE BED AND THE AXLE, VERTICAL HYDRAULIC SHOCK ABSORBER JACKS DISPOSED AT OPPOSITE SIDES OF THE TRUCK, SAID JACKS COMPRISING CYLINDERS AND PISTON RODS SEVERALLY PIVOTED TO THE BED AND THE AXLE, AND HYDRAULIC FLUID PRESSURE AND HYDRAULIC FLUID RETURN MEANS SEVERALLY CONNECTED TO THE UPPER AND LOWER ENDS OF THE JACK CYLINDERS, SAID HYDRAULIC MEANS COMPRISING A BLOCK FORMED WITH MIDDLE, LEFT HAND, AND RIGHT HAND BORES EXTENDING THERETHROUGH, MIDDLE, LEFT HAND, AND RIGHT HAND VALVE CORES SLIDING IN THE BORES, SAID MIDDLE CORE BEING A TWO POSITION CORE AND SAID LEFT AND RIGHT HAND CORES BEING THREE-POSITION CORES, FIRST MEANS FOR INDIVIDUALLY POSITIONING AND SETTING THE MIDDLE CORE IN A FORWARD OPERATIVE OPEN POSITION AND A REAR CLOSED POSITION, SECOND MEANS FOR POSITIONING SAID LEFT AND RIGHT HAND CORES IN OPEN FORWARD AND REAR OPEN POSITIONS AND IN AN INTERMEDIATE CLOSED POSITION, SAID BLOCK HAVING FIRST PASSAGE MEANS CONNECTED TO THE UPPER AND LOWER ENDS OF THE JACK CYLINDERS AND HAVING PORTS OPENING TO THE MIDDLE BORE, SAID MIDDLE CORE HAVING PORT MEANS REGISTRABLE, IN THE FORWARD POSITION THEREOF, WITH SAID FIRST PASSAGE MEANS PORTS, SAID MIDDLE CORE BEING ADAPTED TO CLOSE SAID FIRST PASSAGE MEANS PORTS IN THE REAR POSI-