marye

Claim 1

A LIQUID PUMP WHICH COMPRISES, IN COMBINATION, A CASING, AN OSCILLATING DIAPHRAGM MOUNTED IN SAID CASING TO FORM THEREWITH A PUMP CHAMBER, INLET AND OUTLET VALVES CARRIED BY SAID CASING TO CONTROL THE INFLOW OF LIQUID TO SAID CHAMBER AND ITS OUTFLOW THEREFROM, RESPECTIVELY, A DELIVERY CONDUIT FOR THE OUTFLOW OF LIQUID FROM SAID OUTLET VALVE, SAID CASING COMPRISING MEANS, ADJOINING SAID OUTLET VALVE ON THE DOWNSTREAM SIDE THEREOF, FORMING A PULSATION ABSORBING CHAMBER IN DIRECT COMMUNICATION WITH SAID DELIVERY CONDUIT, SAID PULSATION ABSORBING CHAMBER HAVING A RIGID EDGE EXTENDING ALONG A CLOSED LINE LOCATED IN A PLANE, AND SAID PULSATION ABSORBING CHAMBER BEING LOCATED ON ONE SIDE OF SAID PLANE, MEANS FORMING A THIRD CHAMBER LOCATED ON THE OTHER SIDE OF SAID PLANE FROM SAID PULSATION ABSORBING CHAMBER, SAID THIRD MENTIONED CHAMBER HAVING A SINGLE OPENING LIMITED BY A RIGID EDGE FITTING AGAINST SAID FIRST MENTIONED EDGE WITH A SLIGHT PLAY, A FLEXIBLE DIAPHRAGM OF A THICKNESS JUST A LITTLE GREATER THAN SAID PLAY AND THE PERIPHERY OF WHICH FOLLOWS SAID EDGES ON THE OUTSIDE THEREOF, ONE OF SAID MEANS BEING PROVIDED, ALONG SAID RIGID EDGE THEREOF AND ON THE OUTSIDE OF SAID EDGE, WITH A GROOVE ACCOMMODATING WITH A GASTIGHT FIT THE WHOLE OF THE EDGE OF THE OTHER OF SAID MEANS AND OF SAID DIAPHRAGM PERIPHERY EXTENDING OVER SAID LAST MENTIONED EDGE, SAID GROOVE HAVING A DEPTH, IN A DIRECTION PERPENDICULAR TO SAID PLANE, SUCH THAT, WITH SAID LAST MEMTIONED EDGE AND SAID DIAPHRAGM PERIPHERY FULLY ENGAGED IN SAID GROOVE, THE CLOSED SPACE BETWEEN SAID DIAPHRAGM AND THE INNER FACE OF SAID SECOND MENTIONED MEANS IS UNDER A PRESSURE GREATER THAN ATMOSPHERIC PRESSURE AND SAID DIAPHRAGM BULGES INTO SAID PULSATION ABSORBING CHAMBER.