Self-regulation device for variable discharge pumps

Claim 1

A SELF REGULATING DEVICE FOR CONTROLLING THE CYLINDER CAPACITY OF A VARIABLE DISCHARGE PUMP IN RESPONSE TO EXCESS PRESSURES IN A LOAD CIRCUIT COMPRISING IN COMBINATION: A CASING, MEANS TO CONNECT SAID CASING AT ONE END WITH SAID LOAD CIRCUIT, PISTON MEANS SLIDABLY RECEIVED IN SAID CASING AND HAVING A PISTON ROD AND A PISTON HEAD, SAID PISTON HEAD BEING RESPONSIVE TO SAID PRESSURE FLUID AT SAID ONE END, PISTON STOP MEANS MOUNTED IN THE OTHER THE END OF SAID CASING, SAID PISTON STOP MEANS HAVING AN INNER SLEEVE PORTION DEFINING A CYLINDER CHAMBER FOR RECEIVING THE INNER END OF SAID PISTON ROD, ABUTMENT MEANS IN SAID CASING, FIRST SPRING MEANS ENGAGED BETWEEN SAID ABUTMENT MEANS AND SAID PISTON HEAD, SAID FIRST SPRING MEANS BEING COMPRESSED PROPORTIONATELY TO A PREDETERMINED PUMP DISCHARGE, SPRING ABUTMENT MEANS IN SAID CASING, SECOND SPRING MEANS SUPPORTED ON SAID SPRING ABUTMENT MEANS AND SPACED FROM SAID PISTON HEAD, AND CONNECTING MEANS EXTENDING BETWEEN SAID PISTON HEAD AND SAID VARIABLE DISCHARGE PUMP FOR REDUCING THE CYLINDER CAPACITY OF THE PUMP UPON ACTUATION OF SAID PISTON HEAD AWAY FROM SAID CLOSURE MEANS.