Refrigerant compressor lubrication arrangement

Claim 1

IN A RECIPROCATING COMPRESSOR, A HOUSING, MEANS DEFINING A CRANKCASE IN SAID HOUSING, CYLINDER MEANS IN SAID CRANKCASE, PISTON MEANS MOVABLE IN SAID CYLINDER MEANS, A VERTICALLY DISPOSED DRIVE SHAFT IN SAID CRANKCASE, UPPER BEARING MEANS FOR JOURNALING THE CRANKSHAFT, THE UPPER END OF SAID CRANKSHAFT BEING OPERATIVELY CONNECTED TO A MOTOR, THE LOWER END OF SAID CRANKSHAFT EXTENDING INTO A LUBRICANT SUMP IN SAID HOUSING, CONDUIT MEANS FOR CONVEYING DISCHARGE GASES FROM SAID CYLINDER MEANS, CONDUIT MEANS FOR DISCHARGING SUCTION GAS INTO SAID HOUSING FOR PASSAGE OVER SAID MOTOR TO SAID CYLINDER MEANS, THE IMPROVEMENT COMPRISING FIRST PUMP MEANS IN SAID CRANKSHAFT FOR FORCING LUBRICANT FROM THE SUMP TO SAID UPPER BEARING MEANS FOR LUBRICATING THE UPPER BEARING MEANS, AND SECOND PUMP MEANS IN SAID CRANKSHAFT FOR RETURNING LUBRICANT FROM THE REGION OF SAID UPPER BEARING MEANS IN A PATH SEPARATE FROM THE FLOW PATH OF SUCTION GAS TO PREVENT LUBRICANT FROM BEING ENTRAINED IN THE SUCTION GASES PASSING OVER THE MOTOR INTO THE CYLINDER MEANS.