Self regulating pumps in particular for the injection of fuel into internal combustion engines

Claim 1

A PUMP WHICH COMPRISES, IN COMBINATION, A PUMP BODY FORMING A CYLINDER, A PISTON FITTING SLIDABLY IN SAID CYLINDER AND HAVING A RECIPROCATING MOVEMENT THEREIN, A LIQUID DELIVERY CONDUIT LEADING FROM ONE END OF SAID CYLINDER, SO THAT LIQUID CAN BE DELIVERED FROM SAID CYLINDER THROUGH SAID DELIVERY CONDUIT DURING THE COMPRESSION STROKES OF SAID PISTON, FEED CONDUIT MEANS OPENING INTO SAID CYLINDER FOR FILLING SAID CYLINDER WITH LIQUID DURING THE SUCTION STROKES OF SAID PISTON, A DISCHARGE CONDUIT LEADING FROM SAID CYLINDER AND OPENING TO THE OUTSIDE THEREOF, A VALVE CASING MOUNTED IN FIXED POSITION ON A PORTION OF SAID DISCHARGE CONDUIT, A VALVE IN SAID CASING TO CONTROL THE DISCHARGE OF LIQUID FROM SAID CYLINDER TO THE OUTSIDE THEREOF THROUGH SAID DISCHARGE CONDUIT, WHEREBY OPENING OF SAID DISCHARGE CONDUIT BY SAID VALVE DURING A COMPRESSION STROKE OF SAID PISTON PREVENTS THE DELIVERY OF LIQUID THROUGH SAID DELIVERY CONDUIT, RESILIENT MEANS OPERATIVELY CONNECTED WITH SAID VALVE FOR CONSTANTLY URGING IT TOWARD DISCHARGE CONDUIT CLOSING POSITION, SAID VALVE CASING AND SAID VALVE LIMITING BETWEEN THEM A VARIABLE VOLUME CHAMBER SUCH THAT EXPANSION OF THE VOLUME THEREOF URGES SAID VALVE TOWARD DISCHARGE CONDUIT OPENING POSITION, A FLUID CONTROL CIRCUIT FULL OF FLUID AND WHOLLY DISTINCT FROM SAID DELIVERY CONDUIT AND SAID DISCHARGE CONDUIT, SAID FLUID CONTROL CIRCUIT HAVING AN INLET AND A THROTTLED PASSAGE OPENING TO THE OUTSIDE, SAID CONTROL CIRCUIT BEING IN COMMUNICATION WITH SAID CASING SO THAT IT INCLUDES SAID VARIABLE VOLUME CHAMBER, MEANS OPERATIVELY CONNECTED WITH SAID PISTON AND IN COMMUNICATION WITH SAID CONTROL CIRCUIT INLET FOR PERIODICALLY APPLYING FLUID PRESSURE IMPULSES TO THE FLUID IN SAID CONTROL CIRCUIT AT A FREQUENCY EQUAL TO THE FREQUENCY OF RECIPROCATION OF SAID PISTON SO THAT THE MAXIMUM FLUID PRESSURE DURING EVERY IMPULSE INCREASES AS SAID FREQUENCY INCREASES, WHEREBY, FOR A GIVEN VALUE OF SAID FREQUENCY, SAID MAXIMUM FLUID PRESSURE BECOMES CAPABLE OF OVERCOMING THE ACTION OF SAID RESILIENT MEANS AND OF BRINGING SAID VALVE INTO DISCHARGE CONDUIT OPENING POSITION, SAID MEANS FOR APPLYING PRESSURE FLUID IMPULSES BEING OPERATIVELY CONNECTED WITH SAID PISTON IN SUCH MANNER AS TO START EACH OF SAID PRESSURE IMPULSES WITH A GIVEN CONSTANT PHASE RELATION WITH RESPECT TO THE BEGINNING OF THE CORRESPONDING COMPRESSION STROKE OF SAID PISTON, AN OUTFLOW CONDUIT WHOLLY DISTINCT FROM SAID DELIVERY CONDUIT AND SAID DISCHARGE CONDUIT AND IN COMMUNICATION WITH SAID CHAMBER TO PERMIT ESCAPE OF FLUID THEREFROM DURING THE DISPLACEMENTS OF SAID VALVE FROM DISCHARGE CONDUIT OPENING POSITION TOWARD DISCHARGE CONDUIT CLOSING POSITION AND A THROTTLED PASSAGE IN SAID OUTFLOW CONDUIT TO BRAKE SAID LAST MENTIONED VALVE DISPLACEMENTS SO THAT THEY TAKE PLACE AT A RATE INDEPENDENT OF SAID FREQUENCY OF RECIPROCATION OF SAID PISTON.