Self-adjusting hydraulic valve lifter for piston engines

Claim 1

A SELF-ADJUSTING HYDRAULIC VALVE LIFTER FOR PISTON ENGINES COMPRISING TWO CYLINDRICAL LONGITUDINALLY SLIDABLE TELESCOPED MEMBERS CLOSED ON THE EXTREME ENDS DEFINING A PRESSURE CHAMBER BETWEEN SAID MEMBERS, CHECK VALVE MEANS CONNECTING SAID PRESSURE CHAMBER WITH AN ANTECHAMBER LOCATED IN ONE OF SAID CYLINDRICAL MEMBERS, BORE HOLES IN SAID MEMBERS FOR PROVIDING HYDRAULIC FLUID TO SAID ANTECHAMBER, SAID CYLINDRICAL MEMBERS BEING TELESCOPED INTO EACH OTHER WITH RELATIVELY LARGE CLEARANCE ELASTIC SEALING ELEMENTS SEALING OFF THE SAID TWO MEMBERS WITH RESPECT TO EACH OTHER, AT LEAST ONE VENT BORE FOR SAID PRESSURE CHAMBER COMMUNICATING WITH THE OUTSIDE OF THE VALVE LIFTER FROM THE PRESSURE CHAMBER, A SELF-ACTUATING CLOSURE AND THROTTLE ELEMENT INSERTED IN THE PRESSURE CHAMBER ADJACENT SAID VENT BORE, SAID CLOSURE ELEMENT CLOSING OFF THE VENT BORE WHEN A CERTAIN OVER-PRESSURE EXISTS IN THE PRESSURE CHAMBER.