Dispensing – With resilient biasing means for outlet element – For pivoted and swingable elements
Patent
1991-11-12
1994-04-12
Kashnikow, Andres
Dispensing
With resilient biasing means for outlet element
For pivoted and swingable elements
222541, 222556, B67D 300
Patent
active
053018494
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a dispenser and sealing cap assembly of a plastic material comprising a spout part adapted to be fixed to a container and a sealing cap adapted to close off the spout part and which is connected to the spout part by a spring hinge.
BACKGROUND OF THE INVENTION
Until now such dispenser and sealing cap assemblies were made as one single part by moulding of a rigid plastic material such as polypropylene. In fact, the spring hinges provided on such assemblies between the spout part and the sealing cap only correctly fulfill their function, which is to ensure two stable positions of the cap in relation to the dispensing part, when they are made of a rigid plastic material.
Such spring hinges are known, for example, from the French Patent Nos. 1 402 900 and 78 03 713.
On the known spout and sealing cap assemblies made as one single part with the spring hinge from a rigid plastic material, the tightness between the spout part and the neck of the container must be ensured by means moulded onto the dispensing part, in particular by lips and/or skirts cooperating with the neck of the container. Because of the rigidity of the material of which they are made, these sealing means are unable to compensate possible defects of the neck, which adversely affects the tightness. The use of separate flexible seals on the spout part which would permit a compensating of such defects is not always possible and would increase the cost price of the spout and cap assembly.
Another problem is experienced with the dispenser and sealing cap assemblies provided for flexible tubes containing pasty materials, e.g. toothpaste tubes. Nowadays, these tubes are made more and more from a flexible plastic material, in particular polyethylene or from a complex or multilayer structure having an outside polyethylene film. Under these conditions, a spout and sealing cap assembly, made as one single part from a rigid plastic material such as polypropylene so as to enable the spring hinge provided between the two parts to fulfill its function, cannot be welded directly onto the flexible tube. Rather, this type of assembly must be screwed onto a threaded neck end of a flexible plastic material, in particular polyethylene, welded onto the actual body of the flexible tube. It would be desirable to be able to make spout and sealing cap assemblies with spring hinge which can be fixed directly by welding onto the body of flexible tubes.
SUMMARY OF THE INVENTION
The present invention seeks to provide a spout and sealing cap assembly with spring hinge which, while being easy to make, permits a tight fixing onto a container neck even if the neck has manufacturing defects. A further object of the invention is a spout and sealing cap assembly with spring hinge which, while being easy to make, permits the assembly to be fixed by welding it directly onto the body of a flexible tube.
The spout and sealing cap assembly according to the invention comprises a spout part adapted to be fixed to a container and a sealing cap adapted to seal off the spout part and connected to the spout part by a spring hinge. According to the invention the spout part is made from a flexible plastic material, by moulding, and the cap with the hinge is made as one single part from a rigid plastic material by over-moulding the dispensing part.
Making the spout part from a flexible plastic material permits either the forming onto the spout part of sealing means (lips, skirts, etc.) which are sufficiently flexible so that they can compensate possible manufacturing defects of the container neck when the spout part is screwed or clicked onto the neck, or a direct fixing by welding the spout part onto the body of a flexible tube.
The over-moulding of the spout part by the cap can be localized in the zone of the hinge, in which case the spout part has advantageously, in the zone of the hinge, an edge with a male or female undercut profile ensuring a perfect bonding with the material of the cap and the hinge during the over-moulding.
A
REFERENCES:
patent: 3135441 (1964-06-01), Wise et al.
patent: 3160327 (1964-12-01), Porcelli
patent: 3458080 (1969-07-01), Laurizio
patent: 4022357 (1977-10-01), Dwinell
patent: 4568005 (1986-02-01), Julovec et al.
Guglielmini Bernard
Pellerano Pierre
Kashnikow Andres
Kaufman Joseph A.
Rical S.A.
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