Bottles and jars – Closures – Frangible member or portion
Patent
1990-07-26
1992-02-11
Marcus, Stephen
Bottles and jars
Closures
Frangible member or portion
215258, 264318, B65D 4134, B29D 100
Patent
active
050869388
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a pilfer-proof closure cap for containers, such as bottles and the like, having a closure cap of plastic designed as a screw cap, and to a mold for making the closure.
Various closures have a background shell which is connected in the region of the inner circumference of the shell, via tear-off webs, to a pilfer-proof safety or indicator strip. Separation of the strip from the cap indicates that the cap was, or could have been, removed or tampered with. The strip has on its outside a wall section running obliquely outwards and downwards adjoining the webs and on its inside bears at least one retention member which extends into the inner space bounded by the pilfer-proof strip, when the closure cap has been screwed onto the container orifice. The retention member engages beneath an annular snap-on projection of the container arranged below the screw thread of the container. The pilfer-proof strip on its inside, in the region of the retention member, is formed with a circumferential recess which is open towards the lower end of the pilfer-proof strip, which runs essentially axially, and from the upper wall section of which the retention member extends.
Compared to shrink-on pilfer-proof strips, pilfer-proof strips which can be secured mechanically on containers have the advantage that it suffices for them to be pushed over the snap-on projection when the screw cap is first screwed onto the container orifice designed in accordance with the MCA standard, because, as a consequence of their elasticity, they can snap in beneath the snap-on projection, the retention member possibly bending upwards and remaining in this position. After the snapping in of the retention member of the pilfer-proof strip, the closure cap can only be unscrewed by destroying the pilfer-proof strip, and this indicates the first opening of the container.
GB-A-2 022 063 has already disclosed a closure cap which can be produced in an injection moulding operation, having a pilfer-proof strip which can be secured mechanically on the container, and in which the retention member is a circumferential bead on the inside of the pilfer strip.
From the FR-A-2 499 519 a closure cap is known, the pilfer-proof strip of which at the interior carries peripherally spaced retention fingers, which extend from the inner circumference of the pilfer-proof strip and are provided with parallel inner and outer faces. The retention fingers extend beneath the projection of the container.
The U.S. Pat. No. 4,469,234 discloses a screw cap the pilfer-proof strip of which in the cross section is formed as an inverted U having webs of unequal length, retention fingers extending from the shorter inner web downwards and having end portions bent upwards in a hook-like manner, which extend beneath the container's projection. For the application of the screw cap the retention fingers can move outwards into the interior of the inverted U.
EP-A-0 166 572 furthermore discloses a closure cap of the type stated at the outset, in which the pilfer-proof strip engages beneath the annular snap-on projection by means of retention fingers which widen downwards.
The main disadvantage of the known pilfer-proof strips explained above consists in the fact that the injection moulds which are used for producing the closure caps and open in the axial direction are of relatively elaborate construction, since, for the purpose of releasing the pilfer-proof strip from the mould, the moulds must comprise at least three parts, i.e. as seen in axial section, they must have a horizontal mould parting line at the level of the lower edge of the closure cap, a mould parting line starting from the inside edge of the pilfer-proof strip and running obliquely outwards and downwards, and a vertical mould parting line starting from the bottom section of the pilfer-proof strip in the region of the projection or projections. During the mould release operation, the mould part having the oblique mould parting line is first of all moved downwards in order to release
REFERENCES:
patent: 4346811 (1982-08-01), Hilaire
patent: 4394918 (1983-07-01), Grussen
patent: 4469234 (1984-09-01), Deussen
patent: 4613052 (1986-09-01), Gregory et al.
patent: 4618121 (1986-10-01), Conti
patent: 4806301 (1989-02-01), Conti
Marcus Stephen
Schwarz Paul A.
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