Fuel injection pump for internal combustion engines

Claim 1

A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A PUMP CYLINDER INCLUDING FIRST AND SECOND PORTIONS IN INTERNAL COMMUNICATION, A SUCTION PORTION CONNECTED INTO SAID FIRST PORTION INTERMEDIATE THE LENGTH THEREOF, AN INJECTION PASSAGE CONNECTED TO SAID SECOND PORTION ADJACENT AN END THEREOF OPPOSITE FROM SAID FIRST PORTION, A RECIPROCABLE PLUNGER HAVING GROOVE MEANS ON THE SURFACE THEREOF DEFINING A FUEL PASSAGE FOR COMMUNICATING THE PRESSURE END OF SAID FIRST PORTION WITH SAID SUCTION PASSAGE, A DELIVERY VALVE SLIDABLY FITTED IN SAID SECOND PORTION, BY-PASS PASSAGE MEANS CONNECTED BETWEEN SAID DELIVERY VALVE AND SAID SECOND PORTION FOR COMMUNICATING SAID FIRST PORTION OF SAID CYLINDER WITH SAID INJECTION PASSAGE, MEANS TO BIAS SAID DELIVERY VALVE BODY IN A DIRECTION TOWARD THE END OF SAID SECOND PORTION WHICH IS ADJACENT SAID FIRST PORTION TO CLOSE THE COMMUNICATION BETWEEN SAID FIRST AND SECOND PORTIONS, A PRESSURE RELIEF PASSAGE CONNECTED INTO SAID SECOND PORTION INTERMEDIATE ITS LENGTH AT A LOCATION TO BE UNCOVERED BY SAID VALVE BODY AND TO COMMUNICATE SAID PRESSURE RELIEF PASSAGE WITH SAID INJECTION PASSAGE AND RELIEVE THE PRESSURE THEREOF WHEN SAID BIASING MEANS IS EFFECTIVE TO MOVE SAID VALVE BODY TOWARD THE END OF SAID SECOND PORTION WHICH IS ADJACENT SAID FIRST PORTION, SAID BY-PASS PASSAGE MEANS BEING CLOSED BY SAID VALVE BODY WHEN SAID BIASING MEANS IS EFFECTIVE TO MOVE SAID DELIVERY VALVE BODY TOWARD THE END OF SAID SECOND PORTION WHICH IS ADJACENT SAID FIRST PORTION, SAID PLUNGER, WHEN MOVABLE IN A FIRST DIRECTION, BEING EFFECTIVE TO CLOSE SAID SUCTION PASSAGE AND TO BUILD UP DELIVERY PRESSURE IN THE END OF SAID FIRST PORTION ADJACENT SAID SECOND PORTION AND TO FORCE SAID DELIVERY VALVE BODY IN AN OPPOSITE DIRECTION AND AGAINST SAID BIASING MEANS, SAID DELIVERY VALVE BEING EFFECTIVE FIRST TO CLOSE SAID PRESSURE RELIEF PASSAGE AND THEREAFTER TO CAUSE SAID BY-PASS MEANS TO COMMUNICATE THE PRESSURE END OF SAID FIRST PORTION WITH SAID INJECTION PASSAGE, SAID PLUNGER GROOVE MEANS BEING EFFECTIVE THEREAFTER TO RELIEVE THE PRESSURE IN SAID FIRST PORTION BY COMMUNICATING THE END THEREOF WITH SAID SUCTION LINE AND SAID DELIVERY VALVE BEING EFFECTIVE TO BE MOVED BY SAID BIASING MEANS TO FIRST DISCONNECT SAID BY-PASS MEANS FROM COMMUNICATING WITH SAID INJECTION CONDUIT AND SAID FIRST PORTION AND TO THEREAFTER UNCOVER SAID PRESSURE RELIEF PASSAGE TO CONNECT SAID INJECTION PASSAGE TO SAID PRESSURE RELIEF PASSAGE.