Envelopes – wrappers – and paperboard boxes – Paperboard box – End structure
Patent
1981-06-04
1983-08-09
Price, William
Envelopes, wrappers, and paperboard boxes
Paperboard box
End structure
220307, 220319, 229 55, B65D 4532
Patent
active
043974147
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to containers of the kind commonly known as composite containers, that is to say a container having a body comprising a shell of paperboard material (as hereinafter defined), and a base member sealably closing the bottom end of the shell. The invention is however concerned with composite containers of the particular kind which each has a removable closure, the body having a protective metal ring secured fast over the top end of the shell to define an open mouth of the container body and the closure being insertable into tight sealing engagement with the ring.
The term "paperboard" is to be understood to mean any material consisting wholly or partly of paperboard, cardboard or the like, whether or not the material of the shell includes also one or more other materials, for example metal foil or plastics, applied as a layer to one or both surfaces of the paperboard or otherwise incorporated in the material.
BACKGROUND ART
Composite containers whose body shells are at least partially formed from paperboard are well known. Such containers commonly comprise a plurality of layers of material spirally or convolutely wound one upon the other to provide a generally cylindrical cardboard body whose interior is lined with metal foil or other protective material. During manufacture, the layers of material are continuously wound to produce a tube from which the body shells are severed.
To close the body of such a container it has been proposed to secure a base over one end and slidably to insert into the other end a removable closure. However, disadvantages of this arrangement are firstly that the severing operation to produce each body tends to give rise to slivers of cardboard which may be dislodged into the contents of the container by repeated removal and insertion of the closure; and secondly the closure tends to damage the foil lining of the body during insertion. Other problems which may occur with this type of container wherein the closure is a sliding fit in the container body are leakage of the contents of the container, and (more importantly in some applications) passage of air into, and gas out of, the body which may impair the storage life of the contents of the container.
One object of this invention is to provide a composite container of the particular kind described above, wherein such disadvantages are avoided and which is of a construction suitable for use as a large sealed container for heavy products, such as paint, as well as for manufacture in smaller sizes for any flowable product that requires to be kept in a sealed condition. Such products may include dry or liquid or semi-liquid foodstuffs.
DISCLOSURE OF INVENTION
The invention accordingly provides a container of the particular kind described above in which the protective metal ring has an inner skirt which comprises a wall portion in the general shape of a frustum of a cone, this wall portion terminating in a curl portion which is of relatively large diameter and substantially toroidal in shape. The curl lies radially inward of the frusto-conical wall portion and has a concealed terminal edge as an important safety feature, this edge facing generally radially-outwardly and downwardly. The removable closure has means which engage behind the curl so that the closure makes a close snap fit in the protective ring. The resilience necessary to establish a snap fit is provided either by the closure or by the inner skirt of the ring, or by both; but both the closure and the inner skirt are sufficiently stiff to have only this resilience, thus providing a close seal between the closure and the container body.
Another important feature of the invention is that in the outer wall portion of the ring, which fits closely around an upper terminal portion of the cylindrical body shell and terminates in a flange, this flange is directed inwardly and upwardly and is spaced radially from the outer wall portion of the ring. In this way the ring is given some resilience whereby the flange which bites into the outer su
REFERENCES:
patent: 1943568 (1934-01-01), Ware
patent: 2074231 (1937-03-01), Meacham
patent: 2092118 (1937-09-01), Hodgson
patent: 2652947 (1953-09-01), Henchert
patent: 3142433 (1964-07-01), Balocca
patent: 3244354 (1966-04-01), Bauer
patent: 3347408 (1967-10-01), Baker, Sr.
Elkins Gary E.
Metal Box Limited
Price William
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