Hydraulic intake and exhaust valving arrangement

Claim 1

IN A DOUBLE-ACTING HYDRAULIC CYLINDER ASSEMBLY, THE COMBINATION OF A CASING HAVING A CHAMBER THEREIN, A PISTON POSITIONED IN SAID CHAMBER AND HAVING A PISTON ROD PROJECTING AT LEAST ONE END THEREOF TO THE OUTSIDE OF SAID CASING, SAID CASING AND SAID PISTON BEING RECIPROCABLE RELATIVE TO EACH OTHER, SAID PISTON DIVIDING SAID CHAMBER INTO A PAIR OF CHAMBER PORTIONS, SAID CASING BEING PROVIDED WITH A PAIR OF HYDRAULIC FLUID INLET PORTS AND WITH A PAIR OF EXHAUST PORTS COMMUNICATING WITH THE RESPECTIVE CHAMBER PORTIONS, A PAIR OF OPPOSITELY ACTING INLET VALVES AND A PAIR OF OPPOSITELY ACTING EXHAUST VALVES PROVIDED IN THE RESPECTIVE INLET AND EXHAUST VALVES PROVIDED MEANS COORDINATING OPENING AND CLOSING OF SAID INLET AND EXHAUST VALVES TO PRODICE RELATIVE RECIPROCATION OF SAID CASING AND PISTON, AN EXTERNAL PISTON PROVIDED ON THE PROJECTING END OF SAID PISTON ROT EXTERIORLY OF SAID CASING, AN EXTERNAL CYLINDER CONTAINING SAID EXTERNAL PISTON, SAID EXTERNAL CYLINDER BEING SEPARATE AND DETACHED FROM SAID CASING, SAID EXTERNAL PISTON AND SAID EXTERNAL CYLINDER BEING RECIPROCABLE RELATIVE TO EACH OTHER INDEPENDENTLY OF MOVEMENT OF SAID PISTON ROD, AND MEANS FOR ADMITTING FLUID UNDER PRESSURE INTO SAID EXTERNAL CYLINDER SELECTIVELY TO EITHER SIDE OF SAID EXTERNAL PISTON AND DISCHARGING FLUID FROM THE RELATIVELY OPPOSITE SIDE.