Bottles and jars – Closures – With pressure-responsive valve
Patent
1976-06-01
1977-10-04
Norton, Donald F.
Bottles and jars
Closures
With pressure-responsive valve
215329, 215331, 426131, 426407, B65D 5116
Patent
active
040519724
ABSTRACT:
A one-piece reusable closure for home canning. The closure is adapted for sealing home canning containers, such as "Mason Jars." The closure has a one-piece threaded cap with a bonded annular closed-cell foam gasket at the periphery of the central cover section positioned to seal against the jar lip. A central cover portion is dished outwardly and moves to an inwardly dished configuration when a partial vacuum is developed in the container. When the closure is unscrewed, the central cover section springs with an audible click to the outwardly dished configuration. The closure incorporates a stop mechanism to limit the extent of gasket compression by limiting the threaded engagement of the closure with the container. The mechanism can comprise either a deformed thread groove or a lower edge of the closure adapted to abut a flange on the container when the desired gasket compression is achieved. The compression of the gasket material against the lip of the container is thus limited to a predetermined degree. As the container contents are heated with the gasket so compressed against the lip of the container, gases will be vented under the gasket; however, upon subsequent cooling of the container contents and formation of a partial vacuum therewithin, the closure seals the container to maintain the partial vacuum. The closure may be initially fully tightened and need not be further tightened after heating and subsequent cooling of the container to maintain the seal and partial vacuum within the container.
REFERENCES:
patent: 1574085 (1926-02-01), Hammer
patent: 2046227 (1936-06-01), White
patent: 2449014 (1948-09-01), Shaffer
patent: 3160302 (1964-12-01), Chaplin
patent: 3589545 (1971-06-01), Carpenter
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