Mechanical pump

Claim 1

A DIAPHRAM PUMP FOR PUMPING A VOLATILE LIQUID, SAID PUMP COMPRISING A PUMP HEAD, A PUMP BODY SECURED TO SAID PUMP HEAD, SAID PUMP BODY BEING FORMED FROM A SINGLE PIECE OF SHEET METAL INTO A SINGLE WALLED CUP HAVING A CIRCULAR FLANGE AROUND THE LIP OF THE CUP, A DIAPHRAGM ASSEMBLY INCLUDING A CIRCULAR DIAPHRAGM OF FLEXIBLE FUEL RESISTANT MATERIAL EXTENDING ACROSS SAID PUMP BODY AND HAVING ITS PERIPHERAL MARGIN CLAMPED BETWEEN SAID CIRCULAR FLANGE AND SAID PUMP HEAD, SAID BODY CUP HAVING AN END WALL AND AN ANNULAR PERIPHERAL WALL BETWEEN SAID END WALL AND SAID CIRCULAR FLANGE DEFINING WITH SAID DIAPHRAGM A PUMPING CHAMBER, SAID BODY HAVING A PAIR OF CLOSED TUBULAR PROJECTIONS EXTENDING OUTWARDLY FROM SAID END WALL AND OPENING INTO SAID PUMPING CHAMBER, SAID TUBULAR PROJECTIONS EACH HAVING A PASSAGE THROUGH THE WALL THEREOF, A COIL SPRING WITHIN SAID HEAD BIASING SAID DIAPHRAGM ASSEMBLY TOWARD SAID END WALL, A CIRCULAR PLATE COAXIALLY FIXED TO SAID DIAPHRAGM BETWEEN SAID SPRING AND SAID DIAPHRAGM, SAID PLATE EXTENDING ACROSS SAID PUMPING CHAMBER AND HAVING A MARGINAL EDGE SPACED FROM SAID ANNULAR CUP WALL AND FORMED WITH A RIM FLARED TOWARD SAID PUMPING CHAMBER FOR MOVING THE ANNULAR PORTION OF SAID DIAPHRAGM ADJACENT TO THE PERIPHERAL MARGIN THEREOF AGAINST AND INTO CONTACT WITH SAID ANNULAR PERIPHERAL BODY WALL TO FORCE FUEL OUT OF SAID PUMPING CHAMBER INTO ONE OF SAID TUBULAR PROJECTIONS, SAID DIAPHRAGM ASSEMBLY INCLUDING A ROD TO MOVE SAID DIAPHRAGM ASSEMBLY AGAINST SAID SPRING BIAS TO MOVE SAID ANNULAR DIAPHRAGM PORTION AWAY FROM SAID ANNULAR BODY WALL TO DRAW FUEL INTO SAID PUMPING CHAMBER FROM OTHER ONE OF SAID TUBULAR PROJECTIONS, AN INLET CHECK VALVE MEANS WITHIN SAID OTHER ONE OF SAID TUBULAR PROJECTIONS FOR CONTROLLING FLUID FLOW THROUGH SAID PASSAGE THEREOF, AND OUTLET CHECK VALVE MEANS FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID PASSAGE IN SAID ONE OF SAID TUBULAR PROJECTIONS.