Fluid product dispenser with snap-on fixing ring

Abstract

The invention concerns a fixing device for a fluid product dispenser adapted for mounting on a container or reservoir which has a neck. A dispensing member is mounted on the reservoir neck. The neck has an outer peripheral thickness defining, with the rest of the neck, a lower shoulder. The fixing device comprises a fixing ring to fix the dispensing member on the neck. The fixing ring comprises a peripheral skirt extending up to beneath the shoulder. The skirt is provided with flaps, the ends of which point inwards and upwards and are urged to stop in contact against the shoulder thereby providing a catching mechanism for the fixing ring on the reservoir neck.

Description

The present invention relates to a dispenser for dispensing a fluid substance, the dispenser comprising a container having a neck, and a dispenser member, such as a pump or a valve, mounted on the neck so as to extract the fluid. The invention relates more particularly to a fixing ring for fixing said dispenser member to a neck provided with an outwardly-projecting peripheral thick portion which co-operates with the remainder of the neck to form a bottom shoulder. That type of container with such a neck is in widespread use for pumps or valves that are snap-fastened onto the neck by using the bottom shoulder as a retaining or abutment surface.

BACKGROUND OF THE INVENTION

Document FR-0 704 251 discloses a fixing ring provided with snap-fastening catches at the ends of which snap-fastening lugs designed to be received under the shoulder on the neck are formed. A band then covers the ring to prevent the lugs from being released from under the shoulder. With that type of fixing device, it is possible to remove the ring from the neck so long as the band is not mounted. The snap-fastening catches are flexible, which makes it possible for the lugs to pass over the thick portion to reach the snap-fastening position under the shoulder. Therefore, on mounting the ring on such a neck, the catches must bend outwards, which increases the working diameter of the ring as it passes over the thick portion of the neck. In addition, the ring is permanently fixed only once the band has been mounted: the fixing thus requires two parts.

Document U.S. Pat. No. 4,773,553 discloses another fixing device in which the fixing ring is made of a plastically-deformable material and is provided with catches having heads initially projecting outwards. It is thus possible to mount the ring on the neck without deforming the catches outwards. Final fixing is achieved by engaging a band by force over the ring so that the outwardly-projecting catches are brought back inwards under the shoulder on the neck by the material being deformed plastically. In which case, two parts are also necessary to perform the fixing, and, in addition, some force must be exerted on the band to cause the heads to deform inwards.

Document U.S. Pat. No. 5,299,703 describes a pump-fixing system in which a ring is provided with catches terminated by heads formed inwardly-projected bulges. Prior to being mounted the bulging heads are bent outwards to enable the neck to pass between them. Once in position on the neck of the container, the heads are deformed inwards by means of a band. That system is analogous to the system of Document U.S. Pat. No. 4,773,553, except that the ring is made of metal, and that the heads are bent inwards rather than being caused to deform plastically. Since the ring is made of metal, that system can be likened to crimping because the metal is deformed so as to reduce the inside diameter of the ring. It is also necessary to use a tool to fix the ring to the neck of the container.

SUMMARY OF THE INVENTION

An object of the present invention is to remedy the drawbacks of the above-mentioned prior art by providing a fixing device whose fixing ring achieves permanent fixing without requiring a separate band, and in which mounting the ring involves no deformation of the ring relative to its normal rest dimensions.

To this end, the present invention provides a fixing device for a dispenser for dispensing a fluid substance, the dispenser being suitable for being fitted to a container provided with a neck, and comprising a dispenser member mounted on the neck of the container, said neck forming an outwardly-extending peripheral thick portion co-operating with the remainder of the neck to form a bottom shoulder, said fixing device comprising a fixing ring for fixing the dispenser member to the neck, the fixing ring being provided with a peripheral skirt which extends to below said shoulder, said skirt being provided with flaps whose free ends point inwards and upwards and come into abutment contact against the shoulder, thereby snap-fastening the fixing ring to the neck of the container. On passing over the thick portion, the flaps are situated within the skirt without projecting outwards beyond it, and they can then be bent or can then take up their snap-fastening angular position under the shoulder. Advantageously, the flaps are pre-stressed to point inwards during manufacture of the fixing ring. In which case, the flaps return automatically to their original pre-stressed angular positions in which they point inwards as soon as they go past the thick portion. In a variant, the flaps are urged inwards once the ring is in position on the neck. In which case, a subsequent operation is necessary in order to bend the flaps under the shoulder. In both cases, the fixing is achieved by the ring on its own, without requiring an additional band. The flap ends that are in abutment against the shoulder guarantee permanent fixing on their own.

Preferably, the thickness of the wall of each of the flaps is equal to or less than the thickness of the wall of the skirt so that they do not project from the skirt as the flaps pass over the peripheral thick portion of the neck. It is thus possible to pre-mount the fixing ring inside a decorative trim band, and then to mount the resulting assembly on the container neck. Whereas, in the prior art, the snap-fastening catches must be deformed outwards to pass over the thick portion, in the present invention, the flaps are never deformed outwards, which makes it possible to pre-mount a band that is purely decorative since it is not necessary for fixing the ring to the neck.

The present invention also provides a dispenser including such a fixing device for fixing the dispenser member to the neck of the container.

The invention is described more fully below with reference to the sole FIGURE which, by way of non-limiting example, shows a cross-section through an embodiment of a dispenser of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary, partial cross-sectional view of a container, dispenser member, and fixing device according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The sole FIGURE shows only the top portion of the dispenser which, all together, comprises a container 1 , a fixing device 20 , and a dispenser member 2 .

The container 1 , which may be made of plastic or of glass, is in the form of a body 13 serving to contain a fluid substance and having a neck 10 at its top. It can be seen that the neck 10 extends from the body 13 in the form of a cylindrical section 14 , then forms an outwardly-projecting shoulder 12 , and terminates with another cylindrical section of larger diameter forming an outwardly-projecting peripheral thick portion 11 . The shoulder 12 thus forms the transition between the thick portion 11 and the remainder of the neck 14 that joins onto the body 1 . The top portion of the neck defines an annular surface 15 which may advantageously be provided with an annular sealing bead 16 serving to improve sealing with a neck gasket 24 that provides sealing between the neck 10 and the dispenser member 2 .

In the example shown, the dispenser 2 is a pump, but it is also quite conceivable for it to be valve. The internal structure of the pump is not described because it is not critical for the invention. The pump comprises a pump body 25 and an actuating rod 26 on which an actuating head 27 equipped with a nozzle 28 is mounted. For the purposes of fixing the pump to the neck, a fixing ring 20 is provided to serve as the fixing device. The fixing ring is provided with a recess in which the body of the pump 25 is snap-fastened by force, and with a peripheral skirt 21 which extends downwards. The inside diameter of the skirt 21 is equal to or slightly larger than the outer diameter of the thick portion 11 of the neck so that the skirt 21 can be engaged over the neck with a minimum amount of clearance so as to guarantee the stability of the pump.

In the invention, the skirt 21 is provided with flaps 22 cut out from the skirt and whose free ends point upwards and inwards in the snap-fastening position so as to come into abutment against the shoulder 12 of the neck. The flaps 22 are connected to the skirt by their bottom ends, and they curve inwards to extend into contact with the shoulder 12 . In register with each flap, the skirt defines a window in which the respective flap can be received when it is deformed outwards. The thickness of each of the flaps is advantageously equal to or less than the thickness of the wall of the skirt 21 , so that the flaps can be received in the windows without projecting either inwardly or outwardly. The flaps may thus be fully contained within their respective windows. The flaps can either be pre-stressed with this inwardly-pointing angular position, or else they can be initially received in the respective windows in the skirt, and only subsequently bent into their final snap-fastening position. Preferably, the flaps are originally formed to point inwards because this avoids having to perform a subsequent operation in which the flaps are bent inwards beneath the shoulder 12 on then neck. The flaps, and therefore the ring itself are preferably made of a plastics material molded in the state shown in the sole FIGURE. In which case, the ring 20 is provided with windows 201 formed vertically above each flap 22 . During molding, these windows make it possible to pass mold pins suitable for defining the free ends of flaps as well as the inside wall sectors of the skirt that are situated above the flaps.

In order to make it possible for the advantage of the invention to be well understood, a description follows of a mounting operation in which the ring 20 is mounted on a neck 10 . The ring 20 , with the snap-fastenable pump in it, is engaged onto the neck 10 of the container. The bottom portion of the skirt overlies the thick portion 11 of the neck. As the thick portion 11 continues to penetrate into the skirt, the flaps 22 are forced into their respective windows because of the small amount of clearance that exists between the skirt and the thick portion. The flaps remain forced into their respective windows without projecting outwards until they have gone past the thick portion. They can then return to their initial states in which they project inwardly under the shoulder 12 . Their free ends then abut against this shoulder 12 , thereby achieving ratchet-type snap-fastening because it is then no longer possible to remove the ring. It should be noted that permanent fixing is achieved by the ring on its own. A decorative band 23 may be engaged so as to overlie the ring 20 , but it does not contribute to fixing, and it merely performs an appearance-enhancing function. In addition, since the flaps do not project outwards as they pass over the thick portion, it is possible to mount the band over the ring prior to snap-fastening the ring onto the neck. It is thus possible to pre-mount the band on the ring and to mount the resulting assembly onto the neck, thereby simplifying assembly of the dispenser.

Claims

1. A fixing device for a dispenser for dispensing a fluid substance, the dispenser being suitable for being fitted to a container provided with a neck, and comprising a dispenser member mounted on the neck of the container, the neck forming an outwardly extending peripheral thick portion cooperating with the remainder of the neck to form a bottom shoulder, the fixing device comprising:a fixing ring for fixing the dispenser member to the neck, the fixing ring being provided with a peripheral skirt which extends to below the shoulder, the skirt comprising an outer wall, the skirt being provided with snap-fastening means for extending beneath the shoulder of the neck; and a band mounted on the fixing ring, and receiving means, defined between the band and the snap-fastening means, for receiving the snap-fastening means when the snap-fastening means is deflected outwardly by the neck without causing outward distortion of the band, wherein the receiving means are constituted by at least one recess formed in the peripheral skirt outer wall, so that the outer wall is radially inwardly shifted, the snap-fastening means being located radially inwardly at the level of the recess.

2. A fixing device according to claim 1, wherein the snap-fastening means comprises at least one ratchet formed by the skirt and snapped under the thick portion of the neck.

3. A fixing device according to claim 2, wherein the skirt forms an inner face in contact with the thick portion of the neck.

4. A fixing device according to claim 1, wherein the band engages the outer wall of the skirt overt he whole of its height, except at the level of the recess.

5. A fixing device according to claim 1, wherein the fixing ring comprises mounting means for fixing the dispenser member in the ring.

6. A fixing device according to claim 1, wherein the fixing ring is provided with a gasket engaging the neck.

7. A fixing device according to claim 1, wherein the fixing ring is elastically deformable.

8. A fixing device according to claim 1, wherein the skirt, at the level of the recess, has a reduced thickness.