Plastic closure retained by snapping over bottle neck bead

Bottles and jars – Closures – Cap type

Patent

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Details

215352, 215354, B65D 4116

Patent

active

057622183

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a plastics seal for a bottle having a beaded rim, which seal comprises a sealing cap, which comprises a circular flat cover plate and on the underside of which are provided an outer ring, which, in the locking position, embraces the bottle neck, and an inner sealing ring which abuts at least regionally against the inner circumference of the bottle opening in the manner of a tight cap, the two rings, which are arranged substantially concentrically relative to the central longitudinal axis, being integrally moulded on to the cover plate.
Known plastics seals of this kind (DE `Offenlegungsschrift` 21 04 543) are provided with a cap member and a sealing ring, which serves as a sealing member and abuts against the inner rim of the opening of a bottle having a beaded rim, and which, in turn, comprises a packing collar and a circular pleat which is arranged coaxially with said collar. Plastics seals of this kind involve unfavourably high production costs, owing to their complicated manufacture and mounting, and their range of application is limited.
The invention is based on the object of providing a plastics seal for a bottle having a beaded rim, which seal is inexpensive to manufacture and ensures a satisfactory tightness when used in bottle openings having different diameter variations.
This object is met essentially thereby that the inner sealing ring is provided on its inner side which is opposite the contact surface with a plurality of reinforcing ribs which extend substantially parallel relative to the central longitudinal axis and are designed to be shaped parts which at least regionally provide a flexible supporting engagement for the inner sealing ring when disposed in the sealing position. Further features and advantageous developments are set out in the subsidiary claims.
The plastics seal, designed according to the invention, for a bottle having a beaded edge, is designed to have a plurality of reinforcing ribs in the region of its sealing cap member which abuts against the inner circumference of the bottle opening, which reinforcing ribs engage behind the inner sealing ring on its inner side opposite the contact surface, and which are arranged in a parallel arrangement relative to the central longitudinal axis, by means of which ribs the inner sealing ring is provided not only with a sufficient stability but also with flexibility, and by means of which a tolerance compensation in the region of the contact surface with respect to the bottle opening is possible.
By means of the reinforcing ribs, it is possible for the sealing ring, which is, all in all, thin-walled, to accommodate a deformation of the sealing cap member, which deformation arises from the pressing fiting, in particular when introduced into the bottle opening, such that the tightness is ensured with adequate reliability along the entire inner circumference, while simultaneously preventing unfavourable deformations of the top cap member.
In this regard, the arrangement of the reinforcing ribs permits a thin-walled inner sealing ring, by means of which a flexible adaptation to bottle openings having different tolerances and/or opening contours may be achieved even when a hard plastics material is used. As a result of a convex design of the contact surface, the inner sealing ring has a transitional region which tapers in the direction of the cover plate, such that a transmission of material stresses to the cover plate is prevented and the top of the latter retains an optically pleasant shape.
In the case of the manufacture of the sealing cap as a single part, e.g. by injection moulding, a simple ejection out of the mould is possible as a result of the arrangement of the reinforcing ribs parallel to the axis. It is also conceivable for the reinforcing ribs to be arranged at a certain inclination with respect to the central longitudinal axis, or for the reinforcing ribs to be designed to be curved, the technical limit, in each case, being whether the product is ejectable from the injection moulding tool.
The particul

REFERENCES:
patent: 2850193 (1958-09-01), Wieckmann et al.
patent: 3074579 (1963-01-01), Miller
patent: 3164278 (1965-01-01), Lohrer
patent: 3335893 (1967-08-01), Hanson
patent: 3494496 (1970-02-01), Livingstone
patent: 3872993 (1975-03-01), Aichinger et al.
patent: 3899097 (1975-08-01), Aichinger
patent: 4090630 (1978-05-01), Wiedmer
patent: 4257526 (1981-03-01), Weits et al.

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