EP3609623B1 - Refillable fluid product dispenser - Google Patents

Description

The present invention relates to a refillable fluid product dispenser comprising a dispensing head comprising a fluid product pump, a variable volume reservoir and a filling valve connected to the reservoir. The preferred field of application of the present invention is that of perfumery, cosmetics or even pharmacy. This type of refillable dispenser is often referred to as a “nomadic” dispenser. It generally has a low capacity reservoir of the order of 10 ml at most.

In the prior art, the document is known FR3024056 which describes a refillable dispenser in which the filling valve is integral with the dip tube which disconnects from the pump to perform the filling. The user is forced to pull on the fill valve to bring the dispenser into a state where it can be filled. The architecture of this dispenser is very complex and its use is not really intuitive.

The object of the present invention is to define a refillable dispenser whose refill gesture is simpler, more intuitive or more obvious to an uninformed user. Another object of the present invention is to be able to refill the refillable dispenser using a standard source bottle equipped with a conventional valve stem. Yet another object of the present invention is to seek a variable volume reservoir architecture which generates or imposes a different handling gesture. Another object is to guarantee the opening of the source bottle without exerting a constant pressure on the fluid product stored in the reservoir. More particularly, the opening of the source bottle must occur as soon as the filling valve is pressed against the source bottle.

To do this, the present invention provides a refillable fluid dispenser comprising a dispensing head comprising a fluid pump, a variable volume reservoir and a filling valve connected to the reservoir,

the fluid pump being provided with a dip tube which passes through the reservoir, a sliding member comprising a movable piston sliding in sealed contact around the dip tube so as to vary the volume of the reservoir, the sliding member being movable between a depressed position in which the sliding member is located near the pump and an extended position in which the sliding member is remote from the fluid pump, the reservoir defining a maximum volume in the depressed position and a minimum volume in the extended position , so that the volume of the reservoir increases when the sliding member is pushed around the dip tube towards the fluid pump, the dip tube being provided with a fixed piston which slides in sealed contact in a movable barrel formed by the sliding member, the movable piston sliding around the dip tube between the fluid pump and the fixed piston, the reservoir being delimited axially between the pisto n mobile and the piston fixed and radially between the dip tube and the mobile barrel.

The distributor further comprising an air pump of variable volume, the volume of which varies inversely with that of the reservoir, so as to create resistance to the variation in volume of the reservoir. It is precisely this resistance to the variation in volume which is used to exert sufficient force on the valve stem of the source bottle and thus open its outlet valve. Instead of the expression “air pump”, the expressions “air chamber” or “pneumatic cylinder” or even “pneumatic brake” can also be used. Very generally, the function of the air pump is to temporarily put air under pressure / depression.

Advantageously, the air pump is not sealed, thus communicating with the outside, so that the air in the air pump is momentarily pressurized during a change in volume and then returns to atmospheric pressure a shortly after the end of the volume variation. According to one embodiment, the air pump may include a vent hole through which air enters and leaves the air pump, thereby allowing air to return to atmospheric pressure after each. volume variation. The leakage of the air pump is preferably calibrated so that a sudden and massive variation, as during filling, generates a momentary overpressure in the air pump and that a slow and / or weak variation, as during dispensing fluid, generates only a momentary very low vacuum in the air pump. Thus, when the user strongly presses the filling valve against the valve stem of the source bottle, the volume of the air pump varies suddenly and massively, puts the air it contains under pressure so as to create a pneumatic resistance. sufficient to depress the valve stem of the source bottle and open its outlet valve. The pressure in the air pump will last as long as the user varies its volume and that of the tank without increasing exponentially, since pressurized air escapes from the air pump through the fault d. sealing. As soon as the reservoir is full, the volume of the air pump has reached its minimum, but the pressurized air it contains continues to escape until it returns to atmospheric pressure. On the other hand, during the fluid product distribution phases, the volume of the air pump certainly varies, but very slightly, which allows it to remain almost constantly at atmospheric pressure. In short, the air pump acts as a dynamic brake on the variation in volume of the reservoir which is only really active during the filling phases and almost completely inactive outside these filling phases. In addition, the implementation of such an air pump is very simple and avoids the use of a spring.

In addition, the reservoir is filled by pressing the dispenser against the source bottle, and not by pulling on the dispenser. This responds to a completely classic and intuitive gesture that requires you to press the source bottle to fill or reload the reservoir. Thanks to the air pump, the opening of the outlet valve of the source bottle is ensured.

Thus, the reservoir is empty or practically empty when the two pistons are brought together as close as possible and full or practically full when they are moved apart as far as possible. We can also say that the tank is full or practically full, when the movable piston is as close as possible to the pump. It can also be said that the reservoir is empty when the sliding member is extended to the maximum. Conversely, we can say that the air pump is at its maximum volume, when the sliding member is extended to the maximum and at its minimum volume, when the movable piston is as close as possible to the pump. All the user then has to do is position the filling valve on the valve stem of a source bottle and press on it until the sliding member comes to a stop in the depressed position close to the pump. He does not have to worry about the depression of the valve stem of the source bottle which is guaranteed by the pressurization of the air pump, which occurs simultaneously with the increase in volume of the reservoir. Thus, the opening of the outlet valve is carried out as soon as the filling valve is sufficiently pressed on the valve stem of a source bottle.

Advantageously, the air pump is delimited axially between the fixed piston and the filling valve and disposed axially below the reservoir. The fixed piston is therefore common to the fluid reservoir and to the air pump.

According to a practical embodiment, a fixed sleeve is engaged around the dip tube, this fixed sleeve defining a free lower end forming a sealing lip which is slidably engaged in a movable tube integral with the sliding member, the pump. air being delimited radially between on the one hand the fixed sleeve and the movable pipe and on the other hand the movable barrel. Preferably, the movable barrel includes a vent hole.

According to an interesting feature, the dip tube is permanently secured to the pump and the filling valve is permanently secured to the sliding member.

According to another advantageous characteristic, the filling valve communicates with the reservoir through an intermediate chamber of variable volume inversely to that of the reservoir. In other words, the distribution tank fills up when the intermediate chamber empties. Preferably, the volume of the dispensing tank is greater than that of the intermediate chamber. On the other hand, the intermediate chamber can communicate with the reservoir through at least one fixed channel which is integral with the dip tube. According to a practical embodiment, a fixed sleeve is engaged around the dip tube so as to define said at least one fixed channel between them, this fixed sleeve defining a free lower end forming a sealing lip which is engaged to slide tightly in a movable tube integral with the sliding member, thus defining the intermediate chamber, the fixed piston being advantageously formed by the fixed sleeve.

According to another advantageous aspect of the invention, the movable piston is formed at one end of the movable barrel and the filling valve is mounted at the other end of the movable barrel.

According to a practical embodiment, the filling valve comprises a valve support engaged in the movable barrel and forming a movable pipe in which is engaged a sealing lip, thus defining together an intermediate reservoir through which the filling valve communicates. with the tank.

According to an advantageous characteristic of the invention, the dispenser further comprises a case integral with the dip tube and in which the sliding member can be moved by sealed sliding around the dip tube.

The spirit of the present invention lies in the fact of using the variation in volume of an air pump coupled to the fluid reservoir to create a momentary dynamic resistance which will allow sufficient pressure on the valve stem. a source bottle to open its outlet valve. The leakage of the air pump makes it possible to reduce its volume (while the volume of the fluid reservoir increases) while limiting the overpressure in the air pump. Once the tank is full, the air pump reaches its minimum volume, and after a short time (around 2 to 5 seconds) the air in the air pump is again at atmospheric pressure, so that the fluid reservoir is not subjected to any pressure from the air pump.

• La surpression dans la pompe à air n'a lieu que pendant les phases de remplissage,
• Le réservoir de produit fluide n'est pas sous pression au repos,
• Il n'y a pas de risque de fuite de produit fluide hors du réservoir, étant donné qu'il n'est pas sous pression,
• Il n'y a aucune influence sur la distribution de produit fluide à travers la pompe, étant donné que le réservoir n'est pas sous pression,
• La pompe à air est très facile à réaliser sans pièce supplémentaire en se servant du piston fixe, qui est commun avec le réservoir de produit fluide,
• Le défaut d'étanchéité sous la forme d'un trou d'évent calibré est très simple à réaliser au niveau du fût mobile.

The advantages of this air pump are as follows:

• Overpressure in the air pump only occurs during the filling phases,
• The fluid reservoir is not under pressure at rest,
• There is no risk of fluid product leaking out of the tank, since it is not under pressure,
• There is no influence on the distribution of fluid through the pump, since the reservoir is not under pressure,
• The air pump is very easy to make without additional part by using the fixed piston, which is common with the fluid reservoir,
• The sealing defect in the form of a calibrated vent hole is very simple to achieve at the level of the mobile barrel.

The invention will now be described more fully, with reference to the accompanying drawings, giving by way of non-limiting example, one embodiment of the invention.

• La figure 1 est une vue en coupe transversale verticale à travers un distributeur rechargeable selon l'invention avec son réservoir plein,
• La figure 2 est une vue similaire à la figure 1 avec le réservoir à moitié vide,
• La figure 3 est une vue similaire à la figure 1 avec le réservoir à l'état vide, et
• La figure 4 est une vue similaire à la figure 1 avec le distributeur raccordé à un flacon source qui a déjà rempli le réservoir à moitié.

In the figures:

• The figure 1 is a vertical cross-sectional view through a refillable dispenser according to the invention with its reservoir full,
• The figure 2 is a view similar to figure 1 with the tank half empty,
• The figure 3 is a view similar to figure 1 with the tank empty, and
• The figure 4 is a view similar to figure 1 with the dispenser connected to a source bottle which has already filled the reservoir halfway.

We will first of all refer to the figure 1 to describe in detail the structure of a dispenser produced according to the invention. The refillable dispenser includes a dispenser head T and a container which are associated to together form the dispenser. The dispensing head T can be a completely conventional dispensing head with a fluid pump D comprising a body defining a fluid inlet in the form of an axial inlet pipe E. The fluid product pump D also comprises an actuating rod (not shown) on which is mounted a push button B. By depressing the push button B, fluid is pressurized in a pump defined inside the body. The push-button B can define a dispensing orifice through which the fluid product discharged from the pump is dispensed in the form of spray, jet or drops. For fixing the pump to the container, a fixing member F is provided which holds the body fixedly and which hooks onto a neck or an opening of the container. A removable cap C can optionally cover the fluid pump D and the push button B. This is a completely conventional design for a dispensing head in the field of perfumery, cosmetics or else. from the pharmacy. Since the dispensing head is not the critical entity of the present invention, it will not be described further.

The container on which the dispensing head T is mounted has a particular shape which should not be considered as limiting in its structure. The term “container” should be considered as the complete lower sub-assembly which cooperates with the upper sub-assembly formed by the dispensing head T. The container incorporates a reservoir of fluid R and other functional members, as will be seen below. -after. In this particular non-limiting embodiment, the container forms a dip tube 23 to which the inlet E of the fluid pump D of the dispensing head T is connected. Without departing from the scope of the invention, it is entirely makes it possible to integrate the dip tube 23 into the dispensing head T and not into the container.

The container comprises several constituent parts, namely a case 1, an insert 2, a sliding member 3, a fixed sleeve 4, a valve support 6, a filling valve 7. All these parts should not be considered essential and frozen in their structure.

The case 1 comprises an outer envelope 11 which may have any geometric shape, such as for example circular cylindrical, as is the case in the figures. The case 1 also comprises a re-entrant shoulder 12 at its upper end and a profile interior hooking 18 at its lower end. The outer casing 11 is normally visible from the outside and intended to be entered by the user so as to be able to press the push button B using his index finger.

The insert 2 comprises an annular plate 21 which projects radially outwards. It can be seen that this plate 21 is disposed just below the re-entrant shoulder 12 of the case 11 on the figure 1 . A neck 22 extends upwards from the plate 21: it preferably has a hooking profile capable of cooperating with the fixing ring F of the dispensing head T. The insert 2 also forms the plunger tube 23 stretching down. This dip tube 23 comprises an upper section 24 and a lower section 25 of reduced diameter. The outer wall of the top section 24 is preferably circular cylindrical. At its free lower end, the lower section 25 forms several snap teeth 26, the function of which will be given below. The outer wall of the lower section 25 may be perfectly circular cylindrical, or else formed with vertical ribs, defining between them hollow grooves. At the junction between the upper section 24 and the lower section 25 is formed a downward facing shoulder.

Without departing from the scope of the invention, it is quite possible to produce the neck 22 and the plate 21 in one piece with the case 11 and to directly connect the plunger tube 23 to the inlet E of the product pump. fluid D. According to another variant, it is also possible to pass a plunger tube connected to the inlet E through the insert 2 provided with a tube, no longer plunger, but capable of accommodating inside the fluid pump dip tube D.

The sliding member 3 is a movable part relative to the case 1 and to the insert 2. This sliding member 3 comprises a movable barrel 31 of cylindrical shape, preferably circular. At its upper end, the sliding member 3 comprises a radial flange 34 which ends internally with a movable piston 35 which comes into sealing sliding contact with the outer wall of the dip tube 23, at its upper section 24. At its lower end, the movable barrel 31 internally forms a profile hooking whose function will be given below. The sliding member 31 is preferably made in one piece with one or more different plastic material (s). One can for example imagine that the movable piston 35 is made of a softer material than the movable barrel 31.

The fixed sleeve 4 is fixedly engaged around the lower section 25 of the dip tube 23. More precisely, this fixed sleeve 4 comprises a sheath 41 which is frictionally engaged around the lower section 25. The internal wall of this sheath 41 can be perfectly cylindrical, or else formed with radial ribs defining between them hollow grooves. Be that as it may, one or more channels 43 are formed between the sheath 41 and the lower section 25: these channels 43 extend over the entire height of the sheath 41 so as to open on either side. The fixed sleeve 4 also forms a crown 44 which extends radially outwards to form on its outer periphery a fixed piston 45 which is in sealed sliding contact with the movable shaft 31 of the sliding member 3. To guarantee the fixing. of the sleeve 4 around the lower part 25 of the dip tube 23, the latching heads 26 can engage below the ribs formed inside the sheath 41. It can also be noted that the free end of the sheath 41 forms a sealing lip 42, the function of which will be given below.

A reservoir R is thus formed inside the container. More precisely, this reservoir R is delimited axially between the flange 34 (with its movable piston 35) and the ring 44 (with its fixed piston 45) and radially between the movable barrel 31 and the outer wall of the upper section 24 of the dip tube. 23. It is easily understood that the volume of the reservoir is variable, given that the sliding member 3 can move inside the case 1 with its movable piston 35 in sealed sliding contact around the dip tube 23. Simultaneously , the movable barrel 31 moves relative to the fixed piston 45 of the sleeve 4.

The valve support 6 comprises a fixing sleeve 61 which is forcibly engaged and in a sealed manner inside the movable shaft 31 of the sliding member 3. This sleeve 61 cooperates with the hooking profile 33 to ensure that it stays in place. The valve support 6 also forms a receiving housing 62 for the filling valve 7 which can be of quite conventional design. It may be a mechanical opening valve or a hydraulic opening valve. Its slim design is not critical to the present invention. The valve support 6 also forms a movable pipe 63 which is engaged around the sheath 41 which at its lower end forms the sealing lip 42. Thus, an intermediate chamber I is formed inside the movable pipe 63 at its lower end. - below the inlet of the dip tube 23.

According to the invention, an air pump 30 is also formed inside the container. More precisely, this air pump 30 is delimited axially by the fixed piston 45 (which also delimits the reservoir R) and by the valve support 6 and radially by the sliding barrel 31 and by the sheath 41 and the movable pipe 63. The air pump 30 is therefore arranged axially below the reservoir R and together share the fixed piston 45. The volume of the air pump 30 increases when the volume of the reservoir R decreases, and vice versa. We can say that these two volumes vary inversely. The air in the air pump 30 therefore undergoes pressure variations, thus creating a pneumatic brake which opposes the variations in volume of the reservoir R. Advantageously, the pressure variations in the air pump 30 are attenuated or limited by a leakage of the air pump 30, which may be in the form of a calibrated vent hole 36 formed for example at the level of the sliding barrel 31. This leakage also allows the pump to air 30 to return to atmospheric pressure in a very short time, of the order of 1 to 5 seconds, after the end of the variation in volume. This relaxation time depends on the size of the vent hole 36, which must therefore be accurately calibrated.

Referring again to the figure 1 , it can now be seen that the reservoir R is full and therefore has a maximum volume. The flange 34 is in abutment against the plate 21. Conversely, the air pump 30 and the intermediate chamber I have a minimum volume, given that the sealing lip 42 comes almost into abutment against the bottom of the pipe. mobile 63. However, the reservoir R communicates with the intermediate chamber I through the channels 43. On the other hand, the dip tube 23 communicates directly with the intermediate chamber I, so that the inlet E of the fluid pump D is in fluid communication with the reservoir R. Thus, the actuation of the push button B has the effect of dispensing fluid from the reservoir R. The fluid from the reservoir R travels through the channels 43, the intermediate chamber I and the plunger tube 23 up to the inlet E of the fluid pump D. The fluid can be distributed through a dispensing orifice formed at the level of the push button B.

As the fluid from the reservoir R is distributed, the movable member 3 moves downward away from the fluid pump D. There is thus created between the plate 21 and the flange 34 a dead space M which communicates with the outside between the case 1 and the movable barrel 31. This state of the dispenser is shown in the figure 2 , on which we can see that the tank R is half full or empty. It can be seen that the air pump 30 has increased in volume, given that part of the sheath 41 is now clear of the tubing 63. This variation in volume is very limited, so that the vacuum in the air pump 30 is weak and disappears very quickly with a small supply of outside air which enters the air pump 30 through the vent hole 36. It can also be seen that the intermediate chamber I has increased in volume, since the valve support 6, which is integral with the sliding member 3, has moved downwards, while the fixed sleeve 4 has remained in place on the dip tube. It can thus be said that the volume of the reservoir R decreases as the volumes of the air pump 30, of the intermediate chamber I and of the dead space M increase. However, it should be noted that the section of the intermediate chamber I is much smaller than that of the reservoir R, so that the volume of the intermediate chamber I increases less quickly than the volume of the reservoir decreases, and vice versa. Since the sliding member 3 moves downwards, its lower end comes out more and more from the case 1, thus revealing the indication marking 32. The figure 3 has been shown without the cover 8, but it can very well remain in place, since its height allows the displacement of the sliding member 3 and the indication marking 32 is visible through the reading window 82.

The fluid product continues to be dispensed until the reservoir R is completely empty. We are then in the configuration shown on figure 3 . The volume of the reservoir R is practically zero, while the volumes of the intermediate chamber I and of the dead space M are at the maximum. The sliding member 3 is then in its extended position in which the movable piston 35 is furthest from the fluid pump D. It can even be noted that the movable piston 35 is practically at the same axial height as the fixed piston 45. The sealing lip 42 is positioned at the level of the upper end of the movable tube 63.

In order to refill the reservoir R, the user can place the filling valve 7 on a source bottle S, as shown in FIG. 5. This source bottle S comprises, in a completely conventional manner, a pump or a valve provided with a valve stem S1 which is reciprocally movable against an internal spring to open an outlet valve. It is therefore necessary to press on the valve stem S1 with sufficient axial force to push it in and thus open the outlet valve. The user must therefore support the refillable dispenser on the valve stem S1 with sufficient axial force, so that the fluid product from the source bottle S rises in the intermediate chamber I, then through the channels 43 into the reservoir R of which the volume increases. On the figure 4 , the distributor is shown with the reservoir R half full.

In the absence of an air pump 30, the depression of the valve stem S1, and therefore the opening of the outlet valve, would only occur when the sliding member 3 would have carried out a large part of its stroke towards the end. fluid pump D. In fact, almost nothing, apart from the depression which increases in the reservoir R, would retain the sliding member 3 which would move without pushing the valve stem S1. It would not be at the end of the stroke that the valve stem S1 would be pushed in, when the vacuum in the tank would reach a value greater than the force required to depress the valve stem S1.

With the air pump 30 of the invention, the pressure increases sharply and massively in the air pump 30, when the user strongly presses the refillable dispenser on the valve stem S1. The overpressure thus created acts as a momentary dynamic brake which opposes the variation in volume of the reservoir R, but which is added to the depression which increases in the reservoir R, to exert together a sufficient force to depress the valve stem S1. Thus, this overpressure participates in the thrust force on the valve stem S1 which is thus almost immediately depressed. Thanks to the leakage of the air pump 30, the overpressure is limited, but above all it will disappear quickly when the volume of the air pump 30 no longer varies, that is to say when the tank is full. Indeed, the pressurized air in the air pump 30 can escape through the vent hole 36, but with a limited flow, ensuring a limited momentary overpressure and a subsequent rapid relaxation to atmospheric pressure.

The valve stem S1 thus is applied to the inlet of the filling valve 7 which communicates directly downstream with the intermediate chamber I. The axial force F exerted downwards by the user towards the source bottle S makes it possible to depress the valve stem S1, open the filling valve 7 and push the sliding member 3 inside the case 1 in the direction of the fluid pump D. This has the effect of increasing the volume of the reservoir R in which a vacuum is generated which has the effect of sucking the fluid product from the valve stem S1 through the open filling valve 7, the intermediate chamber I, the volume of which increases, and the channels 43 which connect the intermediate chamber I to the reservoir R. The user can press the refillable dispenser on the source bottle S until the reservoir R is filled again, as shown in the figure figure 1 . When the filling operation is finished, a cover (not shown) can be replaced.

It is possible to optimize the release rate of the distributor by reducing the section of the intermediate chamber I with respect to that of the reservoir R.

The movable piston 35 slides here directly in sealed contact against the outer wall of the plunger tube 23, but one can envisage an embodiment in which the movable piston 35 slides against a part which surrounds the plunger tube, which would for example be connected directly to the plunger tube. inlet E of fluid pump D.

The case 1 almost completely masks the sliding member 3 when the reservoir R is full: however, one can imagine an embodiment in which the case 1 only very partially masks the sliding member 3. Likewise, the case 1 has a circular cylindrical shape, but any geometric shape or not is possible.

Thanks to the present invention, there is a refillable dispenser whose reservoir filling is effected very simply by pushing or pressing the refillable dispenser on the valve stem of a source bottle. The reservoir is filled when the refillable dispenser can no longer be moved relative to the source bottle. The air pump 30, which is advantageously leaky, makes it possible to immediately push in the valve stem S1 of the source bottle S and to prevent the reservoir R from being constantly subjected to pressure from the air pump 30.

Claims (9)

1. A refillable fluid dispenser comprising: a dispenser head (T) including a fluid pump (D), a reservoir (R) of variable volume and a filling valve (7) that is connected to the reservoir (R),
   the fluid pump (D) being provided with a dip tube (23) that passes through the reservoir, a slidable member (3) including a movable piston (35) that slides in sealing contact around the dip tube (23) so as to cause the volume of the reservoir (R) to vary, the slidable member (3) being movable between a pushed-in position in which the slidable member (3) is situated in the proximity of the fluid pump (D) and an extended position in which the slidable member (3) is spaced apart from the fluid pump (D), the reservoir (R) defining a maximum volume in its pushed-in position and a minimum volume in its extended position, such that the volume of the reservoir (R) increases when the slidable member (3) is pushed in around the dip tube (23) towards the fluid pump (D), the dip tube (23) being provided with a stationary piston (45) that slides in sealing contact in a movable cylinder (31) that is formed by the slidable member (3), the movable piston (35) sliding around the dip tube (23) between the fluid pump (D) and the stationary piston (45), the reservoir (R) being defined axially between the movable piston (35) and the stationary piston (45) and radially between the dip tube (23) and the movable cylinder (31),
   the dispenser being characterized in that it further comprises an air pump (30) of variable volume, having a volume that varies inversely with the volume of the reservoir (R), so as to create resistance to the variation in volume of the reservoir (R).
2. A dispenser according to claim 1, wherein the air pump (30) is not sealed, thereby communicating with the outside, such that the air in the air pump (30) is put under pressure momentarily during a variation in volume and then returns to atmospheric pressure a short time after the end of the variation in volume.
3. A dispenser according to claim 1 or claim 2, wherein the air pump (30) includes a vent hole (36) via which air enters and leaves the air pump (30) thereby enabling the air to return to atmospheric pressure after each variation in volume.
4. A dispenser according to any preceding claim, wherein the air pump (30) is defined axially between the stationary piston (45) and the filling valve (7) and is arranged axially below the reservoir (R).
5. A dispenser according to any preceding claim, wherein a stationary sleeve (4) is engaged around the dip tube (23), the stationary sleeve (4) defining a free bottom end that forms a sealing lip (42) that is engaged to slide in sealed manner in a movable tube (63) that is secured to the slidable member (3), the air pump (30) being defined radially between firstly the stationary sleeve (4) and the movable tube (63) and secondly the movable cylinder (31).
6. A dispenser according to any claim 1, 2, 4 or 5, wherein the movable cylinder (31) includes a vent hole (36).
7. A dispenser according to any preceding claim, wherein the dip tube (23) is permanently secured to the pump (D) and the filling valve (7) is permanently secured to the slidable member (3).
8. A dispenser according to any preceding claim, wherein the filling valve (7) communicates with the reservoir (R) through an intermediate chamber (I) of volume that varies inversely with the volume of the reservoir (R), the intermediate chamber (I) communicating with the reservoir (R) through at least one stationary channel (43) that is secured to the dip tube (23).
9. A dispenser according to any preceding claim, further comprising a case (1) that is secured to the dip tube (23) and in which the slidable member (3) is movable by sliding in sealed manner around the dip tube (23).

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