US3047176A - Closure - Google Patents

Description

July 31, 1962 E. A. wlLcKENs 3,047,176

CLOSURE l Filed March 29, 1956 Flc. 1.

INV ENTOR wwf/m# www ATTORNEY United States Patent 3,047,176 CLOSURE Eibe A. Wilckens, Baltimore, Md., assignor to Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York Filed Mar. 29, 1956, Ser. No. 574,658 1 Claim. (Cl. 215-40) This invention relates to caps of the crown type and more particularly to an improved liner for said caps.

A primary object of this invention is theI provision of a crown type cap having improved sealing ability.

Another object of this invention is the provision of a crown cap having an improved liner which enables better sealing of chipped bottles.

Other objects and advantages of the present invention will be in part obvious and in part explained by reference to the accompanying specification and drawings.

FIGURE 1 is a cross sectional view of a cap formed in accordance with the present invention;

lFIGURE 2 is a cross sectional view of a liner in accordance with the present invention; and FIGURE 3 is a cross sectional view illustrating the present invention as applied to a container.

Referring more specifically to the drawings, there is shown a crown type cap or closure having a top or end plate 12 and `a marginal skirt 14 having flutes or depressions 16 alternating with rib yforming plates 18.

Cap 10 has a liner or gasket 20 of an elastic or preferably plastic sealing material, which is of unitary construction, and comprises ya relatively thin web portion 22, preferably of uniform thickness, a peripheral web portion 24 of substantially the same thickness as web portion 22, and a relatively thick boss 26 which is formed between the two previously mentioned web portions.

Boss 26 is non-symmetrically formed, the apex 28 being radially disposed nearer the outer side of said boss. Since apex 28 is not centrally located, the outer side 30, of boss 26, has a much greater, or steeper, mean slope than does the inner side 32; the slope being measured with respect to the plane of the web. The disclosed and preferred shape of boss 26 is instrumental in effecting tight sealing engagement with a container since it permits conformation of the seal to the container top without the exertion of unduly high sealing pressures thereon.

The peripheral web portion 24, which completely surrounds boss 26 is curved in such a manner that it readily conforms to that portion of the inner surface of cap 10 between top '12 and skirt 14. By curving peripheral portion 24 in the same direction as boss 26 an annular channel or groove 34 is created which provides space for the expansion or altered location of boss 26 when the cap is secured to the container. Additionally, since the lower edge 36 of peripheralr portion 24 conforms to the inner surface of cap 10, it is apparent that the repositioning of the material comprising boss 26 will cause an effective seal extending from the lower edge 36 to substantially the inner edge of the boss. Such a seal isv obviously of great commercial value in the sealing of chipped bottles where small portions of the locking ring are missing. The manner in which liner 20 co-acts with a bottle locking ring is clearly illustrated in FIGURE 3 where boss 26 is shown in position against locking ring 38 of bottle 40.

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A typical example of a satisfactory plastisol composition is:

Parts Geon 1211 (polyvinyl chloride having -a molecular weight of about 89,000) 60 Dioctyl phthalate (di-Z-ethylhexyl phthalate) 4 Calcium stearate 3 Staybelite No. 10 (glycerol ester of hydrogenated rosin) In the example all parts are by weight.

Among the advantages of the present cap and liner i design is the `fact that the top of the crown is brought as close as possible to the top of the glass. 'l`his permits a maximum reduction in the height of the Icap and in the size of the blank diameter. Thus there can be employed caps having a height of only .200 inch and blank diameter need only be 1.406 inch, in contrast to avcap of .257 height and a blank diameter of 1.5 inch with conventional caps.

It is to be understood that various possible embodiments may be made of the mechanical features of the above invention, all without departing Ifrom the scope thereof, and that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim:

A plastic unitary sealing liner adapted for use with la container having a cap of the crown type as a closure therefor, said sealing liner comprising a thin central web portion, -a peripheral web portion of substantially the same thickness as said central web portion and a continuous circular boss connecting said central web portion and said peripheral web portion, said boss being inwardly spaced from the edge of said liner and having a continuous rounded apex thereon, said apex of said boss being eccentrically positioned with respect to a vertical line extending through the center of said boss whereby the slope of the inner surface of said boss is substantially less than the slope of the outer surface of said boss, said peripheral web portion being curved and the outer edge thereof being in substantially the same plane as the top of said boss.

References Cited in the iile of this patent UNITED STATES PATENTS 2,427,699 Aronovsky et al. Sept. 23, 1947 2,543,775 Gora Mar. 6, 1951 2,654,913 Maier Oct. 13, 1953 2,681,742 Miller .Tune 22, 1954 2,684,774 Aicllele Ju1y'27, I1954 2,739,724 Gora Mar. 27, 1956 2,754,276 Walker et al. July l0, 1956 FOREIGN PATENTS 523,527 Belgium Oct. 31, 1953

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