Bottles and jars – Closures – Cap type
Patent
1997-03-25
1998-12-15
Cronin, Stephen K.
Bottles and jars
Closures
Cap type
215317, 215318, B65D 4116
Patent
active
058487174
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a snap-on seal arrangement on a container, with a sealing cap with at least one retaining bead for attachment to a container mouth with an external bead, the retaining bead being provided on an elastically expandable cylindrical wall of the sealing cap, where an engagement surface of the retaining bead can be brought into effective engagement with an engagement surface of the external bead.
Snap-on seal arrangements of this type are known. They are made of an elastic grade of plastic material. In most cases, they consist of polyethylene or polypropylene and are produced in one piece by injection molding or compression molding. When the sealing cap is to be removed from the container mouth, the elastic expandability of the cylindrical wall on which the retaining bead is provided means that the retaining bead can be forced up, out, and over the external bead on the container mouth. It is also possible, however, for the sealing cap to be lifted unintentionally from the container mouth by the positive pressure prevailing inside the container.
The task of the invention consists in designing the snap-on cap arrangement described above in such a way that, in comparison with the known snap-on cap arrangements, greater safety is provided against the unintentional lifting-off of the sealing cap by the positive pressure prevailing in the container.
The task is accomplished by the snap-on cap arrangement according to the invention in that the engagement surface of the retaining bead on the sealing cap attached to the container mouth works together with the engagement surface on the external bead of the container mouth to enclose an outwardly expanding gap.
The outward-expanding gap between the two engagement surfaces has the effect that, as a result of a given positive pressure in the container, the forces acting to expand the cylindrical wall of the sealing cap are smaller than in comparable, known snap-on cap arrangements.
Exemplary embodiments of the invention are explained in greater detail below on the basis of the drawings:
FIG. 1 shows a vertical cross section through a first sealing cap;
FIG. 2 shows a vertical cross section through a second sealing cap, which is designed as a threaded, snap-on sealing cap;
FIG. 3 shows on an enlarged scale a cross section through half of a sealing cap and the mouth of the container on which the sealing cap is seated;
FIGS. 4a and 4b, in the same cross section as that of FIG. 3, show a state in which the sealing cap is deformed by the positive pressure prevailing in the container; and
FIG. 5 shows, in the same cross section as that of FIG. 4, a sealing cap not according to the invention.
The sealing cap shown in FIG. 1 consists of plastic and has a circular top wall 1 and a cylindrical circumferential wall 2. A retaining bead 3, which extends around in the circumferential direction, is formed on the inside surface of circumferential wall 2. Circumferential wall 2 is able to expand outward in an elastic manner in such a way that, when the sealing cap is set onto the mouth of a container, retaining bead 3 can slide over an external bead on the container mouth and then lock itself behind this external bead. In the same way, retaining bead 3 is able to slide back over the external bead on the container mouth when the sealing cap is being removed from the container again.
In the same way as that shown in FIG. 1, the sealing cap according to FIG. 2 has a top wall 1 and a cylindrical, circumferential wall 2. On circumferential wall 2, several retaining beads 3 are formed on the inside surface, each of which extends along a helical line of a certain length in such a way that the sealing cap can be screwed down onto the mouth of a container, which carries a multiple external thread. Here, too, however, when the sealing cap is being pulled or pried off approximately in the axial direction from the container mouth, circumferential wall 2 is able to expand elastically, so that retaining beads 3 slide over the corresponding external beads on the container mouth fo
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patent: 5685443 (1997-11-01), Taber et al.
Bosl Udo
Kirchgessner Michael
Cronin Stephen K.
Crown Cork AG
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