Compressor units

Claim 1

IN AN AIR COMPRESSOR UNIT OF THE CHARACTER DESCRIBED FOR SUPPLYING AND MAINTAINING COMPRESSED AIR IN A RECEIVER THEREFOR FROM WHICH SAID COMPRESSED AIR IS WITHDRAWN FOR USE UNDER PRESSURE, THE COMBINATION WHICH COMPRISES AN AIR COMPRESSOR HAVING A COMPRESSION CHAMBER THEREIN, AIR INTAKE MEANS FOR INTRODUCING AIR INTO SAID COMPRESSION CHAMBER FOR COMPRESSION THEREIN, A COMPRESSED AIR CONDUIT FOR CONDUCTING COMPRESSED AIR FROM SAID COMPRESSOR TO SAID RECEIVER, THROTTLE VALVE MEANS IN SAID AIR INTAKE AND MOVABLE THEREIN FROM A FIRST THROTTLING POSITION IN WHICH FLOW OF AIR THROUGH SAID INTAKE INTO SAID COMPRESSION CHAMBER IS SUBSTANTIALLY RESTRICTED INTO A SECOND OPEN POSITION IN WHICH SAID FLOW OF AIR THROUGH SAD AIR INTAKE IS SUBSTANTIALLY UNRESTRICTED BY SAID THROTTLE VALVE MEANS, PUMP AND CONDUIT MEANS FOR INJECTING COOLING OIL UNDER PRESSURE INTO SAID COMPRESSOR, A LIQUID-OPERATED PISTON MEANS FOR MOVING SAID THROTTLE VALVE MEANS FROM SAID FIRST THROTTLING POSITION TOWARD SAID SECOND OPEN POSITION THEREOF, MEANS FOR SELECTIVELY INTRODUCING LIQUID PRESSURE INTO SAID PISTON MEANS FROM SAID COOLING LIQUID PUMP AND CONDUIT MEANS FOR SAID MOVEMENT OF SAID THROTTLE VALVE MEANS, AN AIR-OPERATED PISTON MEANS FOR MOVING SAID THROTTLE VALVE MEANS FROM SAID SECOND OPEN POSITION THEREOF TOWARD SAID FIRST THROTTLING POSITION, MEANS FOR INTRODUCING COMPRESSED AIR PRESSURE FROM SAID RECEIVER INTO SAID AIR-OPERATED PISTON MEANS, AND CONTROL MEANS OPERATIVELY RESPONSIVE TO THE PRESSURE OF SAID COMPRESSED AIR IN SAID RECEIVER AND TO THE PRESSURE IN SAID COOLING LIQUID PUMP AND CONDUIT MEANS FOR SELECTIVELY AND ALTERNATIVELY INTRODUCING SAID AIR PRESSURE TO SAID AIR-OPERATED PISTON AND SAID LIQUID PRESSURE TO SAID LIQUID-OPERATED PISTON FOR DETERMINING SAID MOVEMENTS OF SAID THROTTLE VALVE MEANS TOWARD AND AWAY FROM SAID TWO POSITIONS THEREOF IN RESPONSE TO THE MAINTENANCE OF A PREDETERMINED AIR PRESSURE IN SAID COMPRESSED AIR RECEIVER.