Rotary impeller gas meters

Claim 1

A ROTARY IMPELLER GAS METER COMPRISING A CASING HAVING AN OIL-FREE GAS-MEASURING CHAMBER SEALED AGAINST INGRESS OF OIL, HOUSING FORMING END CHAMNERS ON OPPOSITE SIDES OF THE GAS-MEASURING CHAMBER, A ROTARY IMPELLER IN SAID GAS-MEASURING CHAMBER, A SHAFT FOR SAID IMPELLER, BEARINGS FOR SAID SHAFT DISPOSED IN SAID END CHAMBERS, SAID ROTARY IMPELLER BEING MOUNTED FOR FREE ROTATION SOLELY BY THE PRESSURE OF THE GAS BEING MEASURED, WHEREBY SAID IMPELLER IS DRIVEN BY THE GAS, GEARS DRIVEN BY SAID IMPELLER SHAFT IN ONE OF THE END CHAMBERS, OILTIGHT SEALS COOPERATING WITH SAID SHAFT AND POSITIONED BETWEEN SAID GAS-MEASURING CHAMBER AND SAID END CHAMBERS, MEANS FOR INTRODUCING LUBRICATING OIL INTO SAID END CHAMBERS AND FOR FLOWING SAID OIL CONTINUOUSLY OVER SAID GEARS AND BEARINGS TO LUBRICATE THEM AND WASH THEREFROM CONDENSATES AND IMPURTIES FROM THE GAS WHICH PASS THROUGH SAID OIL-TIGHT SEALS IN VAPOR FORM AND CONDENSE ON SAID BEARINGS AND GEARS IN SAID OIL INTRODUCING MEANS, SUPPLYING OIL CONTINUOUSLY TO SAID OIL INTRODUCING MEANS, AND MEANS FOR CONTINUOUSLY DISCHARGING SPENT OIL FROM THE END CHAMBERS, SAID MEANS FOR SUPPLYING OIL CONTINUOUSLY TO SAID OIL INTRODUCING MEANS BEING SYNCHRONIZED WITH THE ROTATION OF SAID IMPELLER SHAFT, WHEREBY LUBRICATED OIL IS CONTINUOUSLY CIRCULATED THROUGH SAID END CHAMBERS WHENEVER GAS IS INTRODUCED INTO SAID METER.