Push button radiator pressure cap

Claim 1

IN A CLOSURE CAP STRUCTURE FOR ATTACHMENT TO A TUBULAR FILLING NECK HAVING AN OVERFLOW EXHAUST AND A NECK OPENING FOR AN INTERNAL COMBUSTION ENGINE RADIATOR, A GENERALLY CYLINDRICAL CAP HAVING AN ANNULAR FLANGE DEFINING A CENTRAL CAP OPENING AND A FLEXIBLE DIAPHRAGM HAVING PRESSURE SEAL MEANS ON ITS MARGIN GRIPPING SAID ANNULAR FLANGE AND SEALING THE CAP OPENING, SAID CAP BEING PROVIDED WITH AN AXIALLY DEPENDING ANNULAR MARGINAL FLANGE AT ITS OUTER MARGIN WITH AN AXIALLY INNER END OF THE MARGINAL FLANGE CARRYING SECURING TABS FOR RETAINING ENGAGEMENT WITH A FILLER NECK, A GENERALLY CYLINDRICAL TUBULAR DISHED BODY HOUSING HAVING AN OUTER MARGIN AT AN UPPER END IN AXIALLY LAPPED RELATION TO SAID SECURING TABS SECURING THE CAP AND THE HOUSING IN ASSEMBLY AND WITH SAID HOUSING HAVING A RADIALLY INTURNED LOWER END, A SPRING BETWEEN SAID CAP AND SAID OUTER MARGIN OF SAID BODY HOUSING URGING SAID OUTER MARGIN TOWARDS SAID TABS, A TUBULAR SPRING CAP SECURED IN SAID DISHED BODY HOUSING, A CUPPED TUBULAR MEMBER HAVING A PERPIHERAL RIM CARRIED ON SAID RADIALLY INTURNED LOWER END OF SAID BODY HOUSING AND HAVING A RADIALLY DIRECTED SEATING FLANGE DISPOSED ABOUT A SEATING FLANGE OPENING, A RING GASKET CARRIED ON THE UNDERSIDE OF SAID SEATING FLANGE FOR CLOSING A NECK OPENING IN A FILLING NECK, A VALVE CLOSURE UNDERLYING SAID GASKET AND MOVABLE INTO AND OUT OF ENGAGEMENT THEREWITH, A VACUUM VALVE HAVING A STEM SECURED AT ONE END WITH SAID VALVE CLOSURE AND MOVABLE IN SAID SEATING FLANGE OPENING, A SPRING MOUNTED ON SAID SEATING FLANGE AND EXTENDING UPWARDLY IN ENGAGEMENT WITH SAID VALVE DRAWING SAID VALVE CLOSURE AGAINST SAID GASKET, A SPRING BETWEEN SAID SPRING CAP AND SAID SEATING FLANGE FOR HOLDING SAID GASKET IN ENGAGEMENT WITH A FILLER NECK OVER ITS NECK OPENING, AND A PUSH ROD HAVING ONE END OPERATIVELY ENGAGEABLE BY SAID FLEXIBLE DIAPHRAGM AND AN OPPOSITE END OPERATIVELY ENGAGEABLE WITH SAID VACUUM VALVE FOR DISENGAGING SAID VALVE CLOSURE ABOUT SAID SEATING FLANGE OPENING TO PERMIT EXCESS PRESSURE TO BE DISCHARGED THROUGH AN APERTURE IN SAID CUPPED TUBULAR MEMBER AND THROUGH AN OVERFLOW TUBE.