Abstract A tamper-proof closure cap of the type having a shell formed with a top panel portion and a depending skirt portion with an annular gasket having appreciable thickness disposed in the outer margin of the top panel. In a preferred embodiment the skirt portion for a substantial part of its height has an outwardly tapered or flared frusto-conical section with a predetermined angle for matching engagement on the correspondingly tapered or flared frusto-conical side finish of the neck of a container so as to positively limit the downward seating movement of the cap on the container neck. Alternately, the skirt may have a curl, bead or seam formed on its bottom edge which engages continuous or interrupted shoulder means on the neck for positively limiting the downward seating of the cap on the container neck. The container for use with the closure cap also has an annular top rim finish for sealing engagement into the gasket. On application the closure cap is pressed over the container neck until seated and retained in place by means of headspace vacuum until removal. It can be readily removed by rupturing a pre-formed vent in the top panel portion such as by lifting on a ring pull tab.
A closure cap for hermetically sealing a container having an annular gasket-engaging top seal finish on the container rim and having a side finish on the container neck including a downward, outward tapered frusto-conical finish portion having a predetermined angle of inclination or taper, said closure cap comprising, a shell having a top panel with an annular gasket receiving channel therein at the margin and a depending skirt, and a top seal gasket at least substantially filling said channel for indented sealing engagement with said annular gasket-engaging top seal finish, said skirt having in the mid-portion thereof a downward and outward tapered frusto-conical portion with the same angle of inclination or taper as that of said frusto-conical finish portion on said container neck for matching seating engagement thereon the remainder of said skirt having a different conformation from said frusto-conical portion thereof, said matching seating engagement serving to limit the downward movement of said closure cap shell on said container neck thereby preventing cut-through of said top seal gasket.
Claim 2
Dependent Claim
169 words
A closure cap for hermetically sealing a container having an annular gasket-engaging top seal finish on the container rim and having a side finish on the container neck including a downward, outward tapered frusto-conical finish portion having a predetermined angle of inclination or taper, said closure cap comprising, a shell having a top panel with an annular gasket receiving channel therein at the margin and a depending skirt, and a top seal gasket at least substantially filling said channel for indented sealing engagement with said annular gasket-engaging top seal finish, said skirt having in the mid-portion thereof a downward and outward tapered frusto-conical portion with the same angle of inclination or taper as that of said frusto-conical finish portion on said container neck for matching seating engagement thereon the remainder of said skirt having a different conformation from said frusto-conical portion thereof, said matching seating engagement serving to limit the downward movement of said closure cap shell on said container neck thereby preventing cut-through of said top seal gasket.
Claim 3
Dependent Claim
35 words
The closure cap of claim 1 wherein said top panel portion of said closure cap shell has a gasket-receiving channel at its outer margin with said top seal gasket being at least primarily disposed therein.
Claim 4
Dependent Claim
43 words
The closure cap of claim 1 wherein said closure cap shell is formed of semi-rigid material whereby said skirt portion is sufficiently deformable to achieve said matching engagement with said container neck when said frusto-conical surface on said cap skirt is slightly out-of-round.
Claim 5
Dependent Claim
15 words
The closure cap of claim 3 wherein said closure cap shell is formed of aluminum.
Claim 6
Dependent Claim
28 words
The closure cap of claim 1 wherein said top panel portion of said cap shell has a rupturable vent therein and manual lifting means attached to said vent.