Dispensing – Movably mounted supply container – Moving relatively to trap – impeller or valve to cause discharge
Patent
1994-02-16
1996-04-30
Jacyna, J. Casimer
Dispensing
Movably mounted supply container
Moving relatively to trap, impeller or valve to cause discharge
222386, 2223211, 141 2, 239320, 239331, 53 79, 53274, 53510, B05B 1102, B05B 1100
Patent
active
055116981
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for spraying a predetermined dose of a fluid, and to a method of filling the device. More particularly, the invention relates to a device containing a single dose of fluid and suitable for discarding after said dose has been dispensed. The fluid to be sprayed may be a medicine, a cosmetic, or the like. The device of the invention is more particularly intended for spraying into the nose, but it could be used for other purposes: spraying into the ear, under the tongue, etc.
2. Discussion of the Related Art
The single dose may optionally be subdivided into a plurality of subdoses, as disclosed in Document EP-A-0 311 863.
Such devices are known in the state of the art. For example, document EP-A-0 311 863 describes a device comprising a cylindrical tank of fluid in which there slides a piston which is secured to an actuator pusher. The device also includes an outlet passage in communication with the tank of fluid. However that outlet passage is not airtight so the fluid contained in the tank may oxidize or become polluted in contact with the air during storage.
SUMMARY OF THE INVENTION
A particular object of the present invention is to avoid that drawback, but without significantly increasing the cost of the device which is suitable for discarding after being actuated a single time.
The present invention therefore provides a device for spraying a single dose of a fluid in divided form, the device. comprising at least: piston being displaceable relative to said actuator means between a storage position in which it prevents communication between said outlet passage and said cylindrical tank, and an actuation position in which it puts said outlet passage into communication with the cylindrical tank the piston being placed so that a pressure obtaining in the cylindrical tank attracts the piston towards its actuation position, wedging, and can be displaced towards its actuation position only if the pressure that obtains inside the cylindrical tank is sufficient for unwedging it.
In a particular embodiment of the invention, the actuator means comprise a cylindrical portion that extends between an end close to the cylindrical tank and an abutment that is further from the cylindrical tank, said end close to the fluid tank is secured to a ring, said fluid outlet passage is disposed at least in part inside said cylindrical portion of the actuator means, said fluid outlet passage opens out from said cylindrical portion between said ring and said abutment in the vicinity of said ring, the piston includes an internal sleeve that slides over said cylindrical portion of the actuator means, and said piston is in sealing contact with said ring while in the storage position.
Advantageously, the piston includes an outside peripheral sealing lip which slides in sealed manner inside the cylindrical tank and which is wedged between said tank and the ring when the piston is in its storage position. In a particular embodiment, the ring includes an annular rib extending towards the piston, the piston includes an annular groove adapted to receive the rib of the ring, the piston includes an annular rib directed towards the ring and inside said annular groove, and the ring includes an annular groove adapted to receive the annular rib of the piston. In which case, the ring may include at least one passage putting the tank into communication with the groove of the piston when said piston is in its storage position, and the rib of the piston is in sealing contact with the groove of the ring.
Advantageously, the cylindrical tank includes an end wall, and the ring includes a face facing towards said end wall and substantially complementary in shape to said end wall, and said face of the ring comes into abutment against said end wall at the end of the stroke of the piston, such that substantially all of the fluid contained in the tank is expelled.
The piston may optionally be urged towards its storage position by resilient means.
The internal sleeve of
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patent: 3350839 (1967-11-01), Carter
patent: 3824762 (1974-07-01), Walles
patent: 4597245 (1986-07-01), Parker
patent: 4726747 (1988-02-01), Skorka
patent: 4921142 (1990-05-01), Graf et al.
patent: 5031800 (1991-07-01), Brunet
patent: 5257726 (1993-11-01), Graf et al.
patent: 5339595 (1994-08-01), Rouse et al.
patent: 5368201 (1994-11-01), Fuchs
Etablissements Valois (Societe Anonyme)
Jacyna J. Casimer
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