Dispensing – Slitted resilient diaphragm or nipple
Patent
1992-04-13
1993-08-10
Shaver, Kevin P.
Dispensing
Slitted resilient diaphragm or nipple
222212, B65D 572
Patent
active
052341380
DESCRIPTION:
BRIEF SUMMARY
The invention relates to self-closing dispensers for containers containing a liquid or pasty product. These dispensers are of the type comprising a membrane in the form of a convex dome covering one end of the container and at least one slit provided towards the top of the dome of the membrane. The slit is defined by parallel edges adapted to come into contact with one another to seal the dispenser and to move apart to allow the passage of product therethrough when the product is displaced from the dispenser when pressure is applied to the dispenser by squeezing it.
A dispenser of this kind helps make it possible to use the container with only one hand, as it is not necessary to replace a cap on this container in order to prevent outflow of the product when pressure is no longer applied to the dispenser.
The devices known hitherto ensure the desired sealing in a more or less satisfactory manner as soon as pressure ceases to be exerted on the product. The quality of the seal obtained depends, inter alia, on the tolerance with which the slit is produced. In addition, such a design of the slit generally requires additional operations, e.g. cutting with a single blade, increasing the cost price of the device.
The object of the invention is to provide a self-closing dispenser of the type defined hereinbefore, which ensures sealing as soon as the pressure exerted on the product ceases and which, as a result, prevents air intake into the dispenser while having a simple, economical and reliable design.
According to the invention, a self-closing dispenser for a container containing a liquid or pasty product of the type defined hereinbefore is characterised in that a rigid cover is provided to be fixed to the end of the container equipped with the membrane and to partially cover the dome in a region surround the slit which remains uncovered. Projecting supporting means are provided on at least one of the two surfaces formed by the inner surface of cover and the outer surface, of the membrane, and the inner surface of the cover is adapted to correspond to the outer surface of the membrane. A part from the abovementioned supporting means, the whole assembly is such that once the rigid cover has been placed on the container, the action of the supporting means results in deformation of the dome of the membrane and in the edges of the slit fitting together in a sealed manner.
The slit is preferably molded with the membrane such that the edges of the slit are normally spaced slightly apart. Once the rigid capsule has been placed in position the dome is sufficiently deformed to force the edges of the slit together in a sealed manner.
The supporting means advantageously consist of two bosses each in the form of a spherical segment having its center situated in the median plane perpendicular to the length of the slit. These bosses are symmetrical with respect to the diametral plane containing the large dimension of the slit. The bosses are preferably provided on the membrane and are molded directly with this membrane, the bosses having their convexity directed radially towards the exterior.
The dome formed by the membrane is generally spherical and the inner surface of the rigid capsule is a spherical concave surface having the same radius as the dome, apart from the bosses.
The outlet end of the container advantageously comprises an end-cap provided with an external thread, while the rigid cover comprises a sleeve provided with a complementary internal thread adapted to cooperate with the thread of the end-cap in order to hold the cover, the said cover comprising a coaxial cylindrical skirt situated radially between the dome and the sleeve, in order to abut against a shoulder of the container after screwing of the cover.
In addition to the arrangements described hereinabove, the invention also consists of a number of other arrangements which will be described in more detail hereinafter by way of a non-limiting embodiment described with reference to the accompanying drawings, in which:
FIG. 1 is an elevation, with broken-awa
REFERENCES:
patent: 1935089 (1933-11-01), Hamilton
patent: 2552715 (1951-05-01), Gray et al.
patent: 2583340 (1952-01-01), Olsen
patent: 2591354 (1952-04-01), Harris
patent: 3349972 (1967-10-01), Whiteford
patent: 4728006 (1988-03-01), Drobish et al.
patent: 4991745 (1991-02-01), Brown
patent: 5005737 (1991-04-01), Rohr
"L'Oreal"
Shaver Kevin P.
LandOfFree
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