Oxygen generating apparatus

Claim 1

IN AN APPARATUS FOR SUPPLYING A GAS UNDER PRESSURE TO A CONDUIT SUBJECTED TO A FLUCTUATING DEMAND, A GENERATOR FOR THE GAS, CONSTRUCTED TO PRODUCE THE SAME AT A RELATIVELY LOW PRESSURE OF AT A RELATIVELY HIGH PRESSURE, AND HAVING AS PARTS THEREOF AN EXPANSION ENGINE AND A COLUMN RECEIVING FLUID EXHAUSTED BY THE EXPANSION ENGINE, MECHANISM FOR CHANGING THE POINT OF CUTOFF OF SAID EXPANSION ENGINE, MECHANISM FOR CHARGING THE POINT OF INTRODUCTION OF FLUID EXHAUSTED BY THE EXPANSION ENGINE INTO THE COLUMN, MEANS FOR OPERATING SAID MECHANISM FOR CHANGING THE POINT OF CUTOFF OF SAID EXPANSION ENGINE AND SAID MECHANISM FOR CHANGING THE POINT OF INTORDUCTION OF FLUID EXHAUSTED BY THE EXPANSION ENGINE INTO THE COLUMN TO EFFECT CHANGES OF SAID GENERATOR BETWEEN RELATIVELY LOW PRESSURE PRODUCTION AND RELATIVELY HIGH PRESSURE PRODUCTION, A DISCHARGE LINE FOR SAID GENERATOR TO WHICH IT DISCHARGES DURING EITHER PRODUCTION, A BOOSTER TO WHICH SAID DISCHARGE LINE DELIVERS GAS, A RECEIVER TO WHICH SAID BOOSTER DELIVERS GAS, CONNECTION FROM SAID RECEIVER TO SAID CONDUIT, AND MEANS CONTROLLED BY PRESSURE VARIATIONS IN SAID RECEIVER FOR CONTROLLING SAID OPERATING MEANS.