Multiple piston type pump or motor

Claim 1

A PISTON TYPE FLUID PUMP OR MOTOR COMPRISING, A CASING HAVING AT LEAST THREE PAIRS OF CYLINDERS AND A PAIR OF PISTON MEMBERS IN EACH OF SAID PAIRS OF CYLINDERS, EACH PISTON MEMBER DEFINING A PISTON CHAMBER AT ONE END OF THE RESPECTIVE CYLINDER, A SHAFT AND CAM MEANS ON THE SHAFT CONTROLLING RECIPROCATION OF THE PISTON MEMBERS OF EACH PAIR SUBSTANTIALLY 180* OUT OF PHASE WITH EACH OTHER AND AT A PRESELECTED PHASE RELATION TO THE PISTON MEMBERS OF THE OTHER PAIRS, THE CYLINDERS EACH HAVING A SINGLE MAIN PORT AND A SINGLE CONTROL PORT AND THE PISTON MEMBERS EACH HAVING VALVE MEANS THEREON CONTROLLING FLOW BETWEEN THE MAIN AND CONTROL PORTS IN THE RESPECTIVE CYLINDER, A FLUID SUPPLY LINE CONNECTED TO ONE MAIN PORT IN EACH PAIR OF CYLINDERS AND A FLUID EXHAUST LINE CONNECTED TO THE OTHER MAIN PORT IN EACH PAIR OF CYLINDERS, AND PASSAGE MEANS CONNECTING THE CONTROL PORTS IN EACH PAIR OF CYLINDERS TO THE PISTON CHAMBERS IN TWO OTHER CYLINDERS WHEREBY THE VALVE MEANS ON ONE PISTON OF EACH PAIR OPERATES TO CONTROL SUPPLY OF FLUID PRESSURE TO THE PISTON CHAMBERS IN TWO OTHER CYLINDERS AND THE VALVE MEANS ON THE OTHER PISTON MEMBER OF EACH PAIR OPERATES TO CONTROL EXHAUST OF FLUID FROM THE PISTON CHAMBERS IN THOSE TWO CYLINDERS.