Liquid container and closure cover therefor

Claim 1

IN COMBINATION, A HOLLOW CONTAINER HAVING A GENERALLY CYLINDRICAL OPEN NECK END AND A CLOSURE THEREFOR, SAID NECK END HAVING A GENERALLY CYLINDRICAL RETAINING RIM MEMBER THEREIN, MEANS SECURING AN OUTER END PORTION OF SAID RIM MEMBER TO AN OUTER END PORTION OF SAID NECK END, SAID CYLINDRICAL RETAINING RIM MEMBER INCLUDING AN INWARDLY BOWED PORTION INTERMEDIATE SAID OUTER END PORTION AND THE INNER END PORTION THEREOF, SAID INNER END PORTION BEING ADAPTED TO ABUT BUT NORMALLY SPACED INWARDLY FROM THE ADJACENT INNER SURFACES OF SAID NECK END AND ADAPTED TO SLIDINGLY ENGAGE SAID INNER SURFACES, SAID CLOSURE COVER INCLUDING A FIRST GENERALLY CYLINDRICAL LATERALLY AND INWARDLY DIRECTED RETAINING FLANGE MEMBER EXTENDING CIRCUMFERENTIALLY ABOUT THE OUTER PERIPHERY OF SAID CLOSURE COVER AND TERMINATING AT ITS FREE END IN AN ANNULAR GENERALLY RADIALLY EXTENDING JOINING FLANGE WHICH IN TURN TERMINATES AT ITS OUTER PERIPHERY IN A GENERALLY CYLINDRICAL COLLAR PORTION INCLUDING AN INWARDLY BOWED PORTION INTERMEDIATE ITS OPPOSITE ENDS DEFINING AN OUTWARDLY OPENING GROOVE IN WHICH SAID RIM MEMBER INWARDLY BOWED PORTION IS SEATINGLY RECEIVED, SAID MEMBERS EACH BEING CONSTRUCTED OF AT LEAST SEMI-RIGID MATERIAL HAVING RESILIENT PROPERTIES AND SAID CLOSURE COVER INWARDLY BOWED PORTION TERMINATING AT ITS FREE OUTER END IN A GENERALLY RADIALLY EXTENDING ANNULAR FLANGE PORTION ENGAGEABLE WITH THE OUTER END PORTION OF SAID NECK END OF SAID CONTAINER WHEN SAID COVER BOWED PORTION IS SEATED IN SAID GROOVE TO PREVENT FURTHER INWARD MOVEMENT OF SAID CLOSURE COVER RELATIVE TO SAID CONTAINER.