Dispensing – With discharge assistant – Fluid pressure
Patent
1993-10-13
1995-07-04
Kashnikow, Andres
Dispensing
With discharge assistant
Fluid pressure
B65D 8314
Patent
active
054292808
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a fluid dispensing container equipped with a dispensing means carrying an outlet means through which the fluid is dispensed during operation of the dispensing means. In numerous applications, such a dispensing container is used for dispensing toxic or inflammable fluids and thereby presents some danger if it is, accidentally or otherwise, used continuously, considering the quantity of fluid contained in the container, which is intended in general for a plurality of uses.
THE KNOWN PRIOR ART
It has already been proposed, in Patent GB-A-2,050,303 to equip a dispensing container of the aerosol canister type with a metering chamber so as to limit the quantity of fluid dispensed in one utilization: it is clear that such an arrangement is not sufficient to overcome the above drawback because numerous successive uses are possible.
It has also been proposed, in U.S. Pat No. 3,519,171, for preventing complete and therefore dangerous emptying of an aerosol canister, to fit said canister with a ball device, which, at the end of a certain dispensing time, blocks the passage of the fluid to be dispensed through the dispensing means and is held in this position by the action of the pressure of the fluid to be dispensed due to the propellent gas, as long as this action is not balanced by the pressure of a space, separated from the inside of the canister by a membrane permeable to the propellent gas, the structure of this membrane defining a time, at the end of which the ball will free the passage of the fluid to be dispensed towards the dispensing means. The device according to this U.S. Pat. No. 3,519,171, although effectively preventing complete emptying of the canister, makes metering of the quantity of fluid to be dispensed inaccurate, or even random; it will furthermore be noted that it is complex to produce.
U.S. Pat. No. 3,377,004 shows a dispensing container comprising a discharge valve and a bellows, placed in the container connected to the valve; the whole makes it possible to deliver a metered quantity of product. However, there is no short cutoff of the dispensing at the end of the dose.
OBJECT OF THE INVENTION
The subject of the present invention is a fluid dispensing container, with simple construction, making it possible to avoid all the above drawbacks; by virtue of the dispensing container according to the invention, a precise quantity of fluid may be dispensed during one utilization and the dispensing container cannot be continuously emptied.
SUMMARY OF THE INVENTION
According to the invention, a fluid dispensing container equipped with a dispensing means carrying an outlet means through which the fluid is dispensed when the dispensing means is operated, said container comprising on the inside a conditioning chamber communicating with the inside of the container through retarding means made in the form of a passage with high head loss for retarding the supplying of said conditioning chamber with fluid to be dispensed, the conditioning chamber having a variable volume defined by walls, at least one of which is subjected to the internal pressure of the container and is mobile, said conditioning chamber being supplied with fluid to be dispensed through the passage with high head loss and also communicating with the dispensing means, is characterized in that, when the mobile wall is in the position in which the volume of the conditioning chamber is a minimum, the communication between the inside of the container and the dispensing means is interrupted.
A well-defined cutoff of the dispensing is thus obtained.
The communication can be interrupted by the mobile wall itself.
Advantageously, the mobile wall of the conditioning chamber comprises an elastic bellows. At the end of emptying of the conditioning chamber, the elastic bellows comes to block a calibrated orifice constituting the retarding means.
As a variant, the mobile wall of the conditioning chamber may comprise a flexible membrane. At the end of emptying of the conditioning chamber, the membr
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Bauer Daniel
Braque Gerard
Esclar Dominique
"L'Oreal"
Bomberg Kenneth
Kashnikow Andres
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