Bottles and jars – Closures – Cap type
Patent
1985-05-08
1987-06-23
Norton, Donald F.
Bottles and jars
Closures
Cap type
215 31, B65D 4118
Patent
active
046746447
ABSTRACT:
A one-piece tightly fitting, molded plastic lid intended to be used in association with a container having a laterally-protruding lip extending about the perimeter of its mouth. In each embodiment of the invention the plastic lid is provided with a surrounding depending sidewall having a relatively thin upper web segment which is adapted to deform heightwise to conform to the shape of the protruding container lip as the lid is fitted onto the container. The lower region of the lid sidewall has a resilient skirt which is thicker than the web segment and thus has a greater elastic memory. The sidewall skirt stretches when forced over the protruding lip and then the skirt retracts radially inwardly closely adjacent to the outside wall of the container immediately below the lip to stretch the deformable web segment tightly over the lip to seal the mouth of the container.
One aspect of the invention relates to the container which is formed with an integral, outwardly projecting lip about the rim. The cross-section of the lip is contoured to provide a smoothly curving surface of enlarged diameter about which the deformable web of the lid sidewall can be wrapped. In another, modified form of the invention, the container rim is provided with an additional, inwardly projecting lip which cooperates with a sealing ring on the lid in a manner which enhances the seal. This latter configuration additionally provides enhanced hoop strength for the container itself as well as for the combined container and lid.
REFERENCES:
patent: 2814404 (1957-11-01), Towns
patent: 2953272 (1960-09-01), Mumford
patent: 2987206 (1961-06-01), Grussen
patent: 3116846 (1964-01-01), Salminen
patent: 3247994 (1966-04-01), Fuglsang-Madson et al.
patent: 3325044 (1967-06-01), McCutcheon
patent: 3677430 (1972-07-01), Yates
patent: 3792797 (1974-02-01), Mrusek et al.
patent: 3869059 (1975-03-01), Ellis
patent: 4093095 (1978-06-01), Babiol
patent: 4210258 (1980-07-01), von Holdt
patent: 4279358 (1981-07-01), Jacobs
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