Bottles and jars – Closures – Closure expands responsive to internal receptacle pressure
Patent
1988-07-11
1989-12-19
Norton, Donald F.
Bottles and jars
Closures
Closure expands responsive to internal receptacle pressure
215 1C, 220 1R, B65D 4104
Patent
active
048877301
ABSTRACT:
A closure or cap for containers, bottles and jars having a circumferential groove formed by opposed conical surfaces of substantially equal size in the relaxed condition and upon compression of the closure forming a substantially toroidal circumferential groove. On a container sealed with the closure compressed, expansion of the circumferential groove to the relaxed condition indicates failure of the seal or generation of gases within the container. In an alternate embodiment the circumferential conical surfaces form a V-shaped circumferential protrusion in the relaxed condition and a toroidal protrusion in the compressed condition. In another embodiment the circumferential juncture between the conical surfaces and the closure sidewall is modified to reduce the flexure between the compressed and expanded conditions thereby permitting a wider variety of materials to be used for the closures. In a further modification the opposed conical surfaces are unequal in size and slope to the axis of the container to provide a partial latching action wherein a specified pressure differential is required to prevent unlatching of the opposed conical surfaces. In further embodiments single conical surfaces are adapted to specialized closure shapes and depending double conical surfaces to closures for carbonated beverages.
REFERENCES:
patent: 3780693 (1973-12-01), Parr
patent: 4616761 (1986-10-01), Nolan
Deimen James M.
Norton Donald F.
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