Closure assembly for container neck

Claim 1

A CLOSURE ASSEMBLY FOR THE NECK OF A CONTAINER, SAID NECK INCLUDING INNER AND OUTER SURFACES AS WELL AS A FREE OUTER END, THE OUTER SURFACE OF SAID NECK BEING FORMED WITH AT LEAST ONE RECESS THEREIN, A GUARD MEMBER OF RESILIENT MATERIAL COMPRISING INNER AND OUTER TUBULAR PORTIONS, SAID GUARD MEMBER BEING SHAPED AND SIZED TO HAVE A CLOSE SLIDING FIT OVER SAID NECK WITH SAID INNER AND OUTER TUBULAR PORTIONS EMBRACING THE INNER AND OUTER SURFACES OF SAID NECK THEREBETWEEN, SAID INNER TUBULAR PORTION PROVIDING A REDUCED TUBULAR PASSAGE THROUGH SAID NECK, SAID OUTER TUBULAR PORTION HAVING AN INNER SURFACE FORMED WITH AT LEAST ONE RADIALLY INWARDLY DIRECTED BOSS BEING COMPLEMENTARY TO SAID RECESS AND RESILIENTLY SEATED THEREIN TO PROVIDE THEREWITH MEANS RESISTING WITHDRAWAL OF SAID GUARD FROM SAID NECK; A CLOSURE ASSEMBLY COMPRISING A PLUG HAVING A DIAMETER SUBSTANTIALLY SMALLER THAN THAT OF THE REDUCED PASSAGE AND INSERTABLE IN SAID REDUCED PASSAGE, SAID PLUG HAVING A BALL PORTION INTEGRAL WITH THE LOWER END THEREOF, SAID BALL PORTION HAVING A DIAMETER GREATER THAN THAT OF SAID PASSAGE TO COMPRESS CORRESPONDING PORTIONS OF SAID INNER TUBULAR PORTION OF THE GUARD TO PROVIDE A SEAL, AN ANNULAR WEB EXTENDING RADIALLY OUTWARDLY OF SAID PLUG AND DISPOSED THEREABOVE, SAID WEB INCLUDING A DEPENDING CYLINDRICAL SKIRT ADAPTED TO ENCIRCLE THE OUTER TUBULAR PORTION OF SAID GUARD AND HAVING AN INNER SURFACE FORMED WITH SCREW THREADS, THE OUTER SURFACE OF THE OUTER TUBULAR PORTION OF THE GUARD BEING FORMED WITH SCREW THREADS COMPLEMENTARY TO THOSE OF SAID SKIRT, THE THREADS OF SAID SKIRT BEING SIZED TO COMPRESSIVELY ENGAGE THE THREADS OF SAID OUTER TUBULAR PORTION TO PROVIDE A SEAL.