Pressure regulating piston and valve

Claim 1

IN AN INTERNAL COMBUSTION ENGINE PISTON HAVING FIRST AND SECOND PARTS MOVABLE RELATIVE TO ONE ANOTHER IN RESPONSE TO RECIPROCATION OF THE PISTON AND A PRESSURE FLUID CONTAINING CHAMBER WITHIN SAID PISTON WHICH VARIES IN INTERNAL VOLUME IN RESPONSE TO SAID RELATIVE MOVEMENT AND TO VARIATIONS IN THE QUANTITY OF PRESSURE FLUID THEREIN, THE COMBINATION THEREWITH OF A SUPPLY AND DISCHARGE VALVE ASSEMBLY FOR SAID CHAMBER INCLUDING A BORE IN ONE OF SAID PARTS, INLET AND OUTLET PASSAGES COMMUNICATING WITH SAID CHAMBER AND SAID BORE AT AXIALLY SPACED POINTS THEREALONG, A SPOOL VALVE MOVABLE IN SAID BORE TO OPEN SIAD INLET AND CLOSE SAID OUTLET PASSAGES AND VICE VERSA FOR CONTROLLING FLOW OF FLUID THERETHROUGH TO THEREBY VARY THE QUANTITY OF FLUID IN SAID CHAMBER, MEANS FOR YIELDABLY BIASING SAID VALVE TOWARD CLOSED POSITION TO THEREBY REGULATE THE PRESSURE OF THE FLUID IN SAID CHAMBER, SPEED COMPENSATING MEANS INCLUDING A SUPPLY PASSAGE COMMUNICATING WITH SAID BORE AND WITH A SOURCE OF PRESSURE FLUID WHICH VARIES IN PRESSURE WITH THE VELOCITY OF SAID PISTON AND A MOVABLE FOLLOWER EXPOSED TO PRESSURE FLUID IN SAID SUPPLY PASSAGE AND OPERABLY CONNECTED TO SAID VALVE AND BIASING MEANS FOR TRANSLATING A VELOCITY-RELATED PRESSURE VARIATION IN SAID SOURCE INTO A COMPENSATING FORCE FOR SAID VALVE SO THAT IT IS OPERABLE TO PROVIDE SUBSTANTIALLY UNIFORM REGULATION OF THE FLUID PRESSURE IN SAID CHAMBER REGARDLESS OF THE VELOCITY OF SAID PISTON.