Self-regulating reciprocating pumps

Claim 1

A RECIPROCATING ACTION LIQUID PUMP WHICH COMPRISES, IN COMBINATION, A PUMP CYLINDER, A PISTON COOPERATING WITH SAID CYLINDER MOUNTED FOR RECIPROCATING MOVEMENT THEREIN, SO AS TO LIMIT THEREWITH A VARIABLE VOLUME WORKING SPACE, THE MOVEMENTS OF SAID PISTON IN SAID CYLINDER IN THE DIRECTION FOR WHICH THE VOLUME OF SAID WORKING SPACE IS REDUCED BEING CALLED DELIVERY STROKES AND THOSE IN THE OPPOSED DIRECTION RETURN STROKES, MEANS FORMING A CASING IN COMMUNICATION WITH SAID WORKING SPACE, SAID CASING BEING PROVIDED WITH A DISCHARGE PORT OPENING TO THE OUTSIDE, A SHUTTLE MEMBER CONTROLLING SAID DISCHARGE PORT, SAID SHUTTLE MEMBER FITTING MOVABLY IN SAID CASING SO AS TO LIMIT WITH THE INNER WALL THEREOF A FIRST VARIABLE VOLUME CHAMBER, THE MOVEMENTS OF SAID SHUTTLE MEMBER IN SAID CASING IN THE DIRECTION FOR WHICH THE VOLUME OF SAID CHAMBER IS INCREASED BEING CALLED OUTWARD STROKES AND THE MOVEMENTS OF SAID SHUTTLE MEMBER IN THE OPPOSED DIRECTION BEING CALLED RETURN STROKES, A LIQUID DELIVERY CONDUIT STARTING FROM SAID WORKING SPACE WHEREBY LIQUID IS FED THROUGH SAID DELIVERY CONDUIT THE DELIVERY STROKE OF SAID PISTON AS LONG AS SAID DISCHARGE PORT IS CLOSED BY SAID SHUTTLE MEMBER, MEANS OPERATIVELY CONNECTED WITH SAID PISTON FORMING A SECOND VARIABLE VOLUME CHAMBER IN CONSTANT FREE COMMUNICATION WITH SAID FIRST VARIABLE VOLUME CHAMBER AND OF A VOLUME VARYING IN SYNCHRONISM WITH THAT OF SAID VARIABLE VOLUME WORKING SPACE, MEANS, OPERATIVE AT LEAST DURING THE RETURN STROKES OF SAID PISTON, FOR EXERTING AT LEAST A LIMITED THRUST ON SAID SHUTTLE MEMBER TO URGE IT IN THE DIRECTION TO PRODUCE THE RETURN STROKES THEREOF, MEANS FORMING AN ADJUSTABLE VOLUME THIRD CHAMBER IN CONSTANT FREE COMMUNICATION WITH BOTH OF SAID TWO FIRST MENTIONED VARIABLE VOLUME CHAMBERS, A MASS OF LIQUID FILLING THE WHOLE OF THE SPACE OF SAID THREE COMMUNICATING CHAMBERS, AND MEANS OPERATIVELY CONNECTED WITH SAID LAST MENTIONED MEANS AND RESPONSIVE TO VARIATIONS OF THE SPEED OF OPERATION OF SAID PUMP TO VARY THE VOLUME OF SAID THIRD CHAMBER IN ACCORDANCE WITH VARIATIONS OF SAID SPEED OF OPERATION.