Fluid sprinkling – spraying – and diffusing – Terminal outlet formed between parts mounted for relative... – Axially movable outlet part
Patent
1998-07-08
1999-11-30
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Terminal outlet formed between parts mounted for relative...
Axially movable outlet part
239327, 239570, B65D 4720
Patent
active
059927640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a nozzle for dispensing liquid or semi-liquid substances.
2. Description of the Related Art
There already exist dispenser nozzles designed to be mounted on tanks and suitable for being put under pressure.
In general, the delivery valve is situated inside the pump mechanism that serves to deliver the substance. The pump is actuated by a pushbutton forming a spray-nozzle.
Nevertheless, since the nozzle is mounted downstream from the delivery valve, there remains a volume of substance that is exposed to air between said valve and the ejection orifice of the nozzle.
In certain fields of application, and in particular with pharmaceuticals and cosmetics, this volume of substance that is not protected from the outside atmosphere can become contaminated by bacterial pollution or can dry out and thus block the ejection duct.
Under such conditions, the substance remaining in the tank becomes unusable.
To remedy that difficulty, CH-A-178923 proposes a nozzle comprising: secondly with an ejection orifice; and by a rod carrying a plug at its outer end which co-operates with the ejection orifice to form a delivery valve, and carrying a transverse wall at its inner end that leaves a passage for the substance and that co-operates with resilient return means for returning the moving shutter towards a closed position in which the plug is engaged in sealed manner in the delivery orifice.
Nevertheless, since the shutter is actuated manually, the pressure difference that controls both opening and closing of the delivery valve is small (about 0.1 bars).
This means that after the shutter has been released and the delivery valve has closed, sealing is not sufficiently effective to ensure that no air is taken in.
Under such conditions, there remains a risk of the substance becoming polluted.
An object of the present invention is to solve that technical problem in satisfactory manner by improving sealing of the nozzle so that it can be used with sterile substances.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by a nozzle designed to be mounted on a tank and suitable for being put under pressure, the nozzle being of the type comprising: secondly with an ejection orifice; and by a rod carrying a plug at its outer end which co-operates with the ejection orifice to form a delivery valve, and carrying a transverse wall at its inner end that leaves a passage for the substance and that co-operates with resilient return means for returning the moving shutter towards a closed position in which the plug is engaged in sealed manner in the delivery orifice; valve constituted by a deformable peripheral lip subdividing the passage for the substance around the rod in sealed manner into an upstream compartment and a downstream compartment.
In an advantageous embodiment, said lip is secured to the rod, and, in the closed position of the valve, the free end of the lip is in bearing contact against the inside wall of the thimble.
In a particular embodiment, said lip is carried by a ring that is coaxial with the rod.
Preferably, said transverse wall is integrally formed with said ring.
In another embodiment, the upstream end of the lip is secured to the rod.
In yet another embodiment, said transverse wall is resiliently deformable and is retained by its peripheral edge at the coupling end of the thimble, thereby forming resilient return means for the shutter.
According to an advantageous characteristic, said rod is axial and together with the transverse wall it defines a peripheral shoulder.
In a variant embodiment, said resilient return means comprise a helical spring surrounding the rod of the shutter and having a rear end bearing against the shoulder and a front end bearing against the inside wall of the thimble.
According to a particular characteristic of this variant, the front end of the spring bears against longitudinal ribs extending along the inside wall of the thimble.
According to another characteristic of this variant,
REFERENCES:
patent: 2060455 (1936-11-01), Wittner
patent: 2106046 (1938-01-01), Barlow et al.
patent: 2815247 (1957-12-01), Hogeman
patent: 3379490 (1968-04-01), Schwartzman
patent: 3863844 (1975-02-01), McMillan
Bougamont Jean-Louis
Hennemann Pascal
Sofab
Weldon Kevin
LandOfFree
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