EP1472007B1 - Pump liquid product dispenser - Google Patents

Abstract

A liquid product dispenser includes a reservoir and a pump. The pump body includes an outer portion forming a sealing closure between the pump body and the reservoir nozzle and the pump body includes an annular projection extending inwards, molded in one single piece, while the piston includes an annular stop co-operating with the annular projection to define a released position of the piston.

Description

The invention relates to a liquid product dispenser and more particularly relates to the field of miniature sprayers designed to contain a low dose of a luxury product such as for example a perfume. Such sprayers are mainly intended to be distributed free of charge to customers to make known and appreciate the products they contain.

In the field of miniature sprayers used for the promotion of products and therefore intended to be offered to the consumer, the constant aim is to simplify the structure of the device and lower manufacturing costs. To do this, we try to reduce the number of components and make them easier to manufacture and assemble.

We know, for example from the EP-A-0 957 036 a liquid product dispenser comprising a reservoir having a mouth and a pump installed in said mouth. This pump comprises a pump body in which is mounted a piston, which slides in a sealed manner in the pump body to define with it a liquid metering chamber, an inlet valve establishing communication between said metering chamber and the reservoir containing liquid to be sprayed, an exhaust valve establishing communication between said metering chamber and product dispensing means and a spring biasing said piston to a predetermined relaxed position, for which said metering chamber is at its maximum volume . However, the pump body here has a vent hole.

Classically, as described in US-A-4,735,347 and US-A-2,889,964 , the assembly between the pump body and the mouth of the reservoir is ensured by the establishment of an annular closure piece called "expander", which allows the clamping radially outwards of the pump body against the inner wall of the mouth of the bottle and which also serves as axial stop piston, determining the relaxed position (that is to say, the rest position, before actuation) of the piston. This relaxed position for which the metering chamber is at its maximum volume is stabilized under the bias of said spring.

The invention aims in the first place to the removal of this closure piece forming abutment, called the expander.

• un corps de pompe dans lequel est monté un piston, lequel coulisse de façon étanche dans le corps de pompe pour définir avec lui une chambre de dosage du liquide,
• un clapet d'admission établissant la communication entre ladite chambre de dosage et le réservoir,
• un clapet d'échappement établissant la communication entre ladite chambre de dosage et des moyens de distribution,
• un ressort sollicitant ledit piston vers une position relâchée de ce dernier pour laquelle ladite chambre de dosage est à son volume maximum,

caractérisé en ce que ledit corps de pompe comporte une portion extérieure formant bouchon assurant l'étanchéité entre le corps de pompe et ladite embouchure, et en ce que ledit corps de pompe comporte une saillie annulaire s'étendant vers l'intérieur, venue de moulage, ledit piston comportant une butée annulaire coopérant avec ladite saillie annulaire pour définir ladite position relâchée, sous la sollicitation dudit ressort.More particularly, the invention relates to a liquid product dispenser comprising a reservoir comprising a mouth and a pump installed in said mouth, said pump comprising:

• a pump body in which is mounted a piston, which slides in a sealed manner in the pump body to define with it a liquid dosing chamber,
• an inlet valve establishing communication between said metering chamber and the reservoir,
• an exhaust valve establishing communication between said metering chamber and distribution means,
• a spring biasing said piston towards a relaxed position thereof for which said dosing chamber is at its maximum volume,

characterized in that said pump body has an outer cap portion sealing between the pump body and said mouth, and said pump body has an inwardly extending annular projection integrally molded therein said piston having an annular abutment cooperating with said annular projection to define said relaxed position under the bias of said spring.

In the case of a sprayer, said dispensing means are arranged in liquid spraying means.

According to an advantageous characteristic, said annular projection has the shape of a flexible lip. Preferably, it is a lip returned to the inside of the pump body. Various ways will be described later to conform such a flexible lip which has been molded with the pump body. To facilitate this assembly, the annular abutment of the piston comprises, on one side, a stop face cooperating with the lip and, on the other side, a frustoconical portion participating in the overturning of said lip during the introduction of said piston. in the pump body.

To facilitate assembly, said lip may be segmented into several circumferentially adjacent sections.

All elements of the pump may be molded plastic except the spring. As will be seen below, this pump comprises a minimum number of moldings and all parts are easy to manufacture by molding and in particular easily demoldable. The bottle may be glass or, preferably, molded plastic.

According to one embodiment, said intake and exhaust valves comprise respectively a plug and a needle defined by a common shutter, movable in axial translation inside the pump body and around which is mounted the spring. It is supported between the pump body and a shoulder of said common shutter. As a result, the piston is biased under the action of the spring towards said released position, via the common shutter, which tends to keep the exhaust valve closed. More specifically, one end of said shutter forms a frustoconical needle which cooperates with the internal orifice of an exhaust duct formed in the piston, to constitute said exhaust valve and the other end of said shutter cooperates with a tube of suction of said pump body, to constitute said intake valve. The suction tube extends in the extension of the metering chamber and immersed in the liquid contained in said reservoir. It came molding with said pump body.

In one example, the shutter has a plug portion which is adapted to slide sealingly within the suction tube. At least one longitudinal groove is provided on the surface of said plug, which allows the passage of the product in the intake phase. All the elements are advantageously of circular section and axial symmetry.

The diameter of the circular contact zone of the internal orifice of the discharge pipe against which the needle is to be carried is less than the internal diameter of the bore of the suction tube, that is to say the external diameter bushel.

The shutter has a shoulder for the setting of the return spring. In addition, said pump body has an annular upper flange bearing on the edge of the mouth.

Furthermore, a separable strip may be provided at the base of a pusher associated with the piston, this strip ensures, before use, the retention of the piston in the low position, which ensures a better seal of the pump (because the valve intake is closed) but also the inviolability and better preservation of the product.

According to a variant, the innermost end of the shutter is shaped into a bell capable of capping an end portion of the suction tube which projects at the bottom of the metering chamber and to slide in a sealed manner along the outer surface of this end portion. This arrangement allows easier mounting. The suction tube can then advantageously comprise an axial bore of very small diameter favoring the priming of the pump by capillary action.

• la figure 1 représente une vue en coupe et en élévation d'un mode de réalisation d'un distributeur formant pulvérisateur conforme à l'invention, avant sa première utilisation ;
• la figure 2 représente une vue semblable à celle de la figure 1, après enlèvement de la bande séparable,
• la figure 3 représente une vue semblable à celle de la figure 2, pendant une phase de pulvérisation du produit ;
• la figure 4 est une vue de détail de la partie supérieure du corps de pompe, montrant une variante ;
• la figure 5 est une vue analogue à la figure 1 illustrant une variante où le piston est laissé en position relâchée avant utilisation ;
• la figure 6 illustre une variante de la figure 5 ;
• la figure 7 est une vue de détail illustrant une variante du clapet d'admission ;
• la figure 8 illustre encore une autre variante du pulvérisateur ;
• la figure 9 est une vue de détail illustrant une variante de montage du corps de pompe sur l'embouchure du réservoir ;
• la figure 10 est une vue de détail semblable à la figure 9 illustrant encore une variante ; et
• les figures 11 à 13 illustrent les étapes successives de moulage du corps de pompe et le processus de retournement de la lèvre.

The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of several embodiments of a dispenser forming a liquid product sprayer according to its principle, given only for example and with reference to the accompanying drawings, in which:

• Figure 1 shows a sectional and elevational view of an embodiment of a sprayer dispenser according to the invention, before its first use;
• FIG. 2 represents a view similar to that of FIG. 1, after removal of the separable strip,
• Figure 3 shows a view similar to that of Figure 2, during a product spraying phase;
• Figure 4 is a detail view of the upper part of the pump body, showing a variant;
• Figure 5 is a view similar to Figure 1 illustrating a variant where the piston is left in the relaxed position before use;
• Figure 6 illustrates a variant of Figure 5;
• Figure 7 is a detail view illustrating a variant of the intake valve;
• Figure 8 illustrates yet another variant of the sprayer;
• Figure 9 is a detail view illustrating a mounting variant of the pump body on the mouth of the reservoir;
• Fig. 10 is a detail view similar to Fig. 9 further illustrating a variant; and
• Figures 11 to 13 illustrate the successive steps of molding the pump body and the process of turning the lip.

Referring more particularly to FIGS. 1 to 3, the sprayer shown comprises a reservoir 1 provided with a mouthpiece 10, in which is enclosed a liquid product such as a perfume. In the example shown, the reservoir is cylindrical and the mouth has an internal diameter equal to that of the reservoir. However, this mouth could also have the shape of a neck more or less shrunk.

A precompression pump having a cylindro-conical pump body 2 is mounted on the reservoir; said pump body is installed in the mouth. More specifically, the body 2 is fitted with tight radial clamping in the mouth 10 in the manner of a plug. The pump body has in fact an outer portion 16 forming a stopper alone ensuring the seal between the pump body and said mouth.

The pump body 2 has an annular upper flange 21 which bears on the rim of the mouth 10 thus limiting the depression of the body in the tank 1 and adjusting the position of the suction tube 22 inside. of this reservoir, with respect to the level of liquid. The suction tube 22 is a lower extension of the pump body. He came casting with the pump body itself.

The pump body 2 encloses a cylindrical piston 3 cooperating by means of a return spring 4 with an intake valve 17 and with an exhaust valve 18. It defines with the wall of the pump body a metering chamber 19 .

The piston 3 carries an outer tubular rod 31 extended outwardly by an axial exhaust duct. The discharge duct 30 extends the metering chamber to the outside. The internal volume of the rod 31 is part of the metering chamber.

The tubular rod 31 is surmounted by a dispensing head 7 forming a push button which carries an ejection orifice 70. The rod 31 is extended, in the upper part, by a core 33 delimiting in a complementary manner with the inner wall of the head 7, on the one hand an outlet channel 37 fed by the discharge duct 30 and, on the other hand, a vortex swirling system 38 into which the channel 37 opens. The latter extends here to the periphery In fact, as is clear from FIGS. 1 to 3, the piston, the tubular rod 31 and the core form only one molded part, made of plastic.

The vortex system 38 is defined on the inner face of the head 7 by molded recesses, closed in contact with the core. The upward abutment of the core 33 inside the head 7 automatically ensures the tight connection between the ducts, the recesses forming channels of the vortex system and the nozzle, without it being necessary to provide an indexing of the parts opposite.

For all practical purposes, it is nevertheless possible to provide on the head or on the core a guide rib cooperating with an axial groove to perform an automatic positioning. The head 7 covering the core 33 has a side skirt 71 provided at its lower end with a detachable peripheral band 6, ensuring its locking in the low position. It should be noted that in this position the inlet valve is closed, which greatly improves the sealing of the pump before its first use. The band 6 is separable from the head by being attached to the skirt 71 by a weakening zone 61 may be broken or detached by traction. For this purpose, the strip 6 is provided with a gripping tab 63.

The band 6 carries a continuous or discontinuous internal projection 62 which is engaged with the external wall of the tank 1, by hooking into a retaining element. This is formed of a flange 11 of the tank mouth 1 delimited by a reduction in thickness of the tank wall at the mouth; an annular groove 12 is formed on the body of the reservoir.

The pump comprises a shutter 5, common to the intake valve 17 and the exhaust valve 18 since it forms both a valve 51 for the intake valve and a frustoconical needle 52 for the exhaust valve. The common shutter 5 is movable in axial translation inside the pump body 2. It comprises a shoulder 54 against which bears the spring 4. The latter is mounted with initial precompression between the pump body and the shoulder. The pump body 2 is provided with an internal coaxial sleeve 24 defining, on the one hand, with the side wall of the pump body, a cylindrical zone in which the piston 3 is guided and, on the other hand, with the shutter 5 is a central housing for the spring 4. The needle 52 is formed of the frustoconical upper end of the shutter 5. Said needle is urged against the internal orifice of the exhaust duct 30. Outside a period of spraying or in the intake phase, the needle 52 is in sealing contact against the internal orifice of the exhaust duct 30.

The plug 51 is formed, meanwhile, of the innermost portion, cylindrical, of the shutter 5 which is able to slide in a sealed manner in the suction tube 22 and more particularly in a short bore 20 defined in the vicinity from the bottom of the dosing chamber. A groove 51a is made longitudinally over a sufficient height of the plug to allow, in the intake phase, the passage of the product by suction in the tank 1.

Another embodiment, not shown, is to provide on the same height, an annular necking allowing the passage of the product.

The height of the shutter 5 and more particularly that of the plug, is such that it occupies, in the depressed position of the piston, almost the entire internal volume of the suction tube 22 leaving only a slight clearance, as shown in FIG. 1. The head is held in the low position by the band 6 against the return forces of the spring 4. This arrangement makes it possible to ensure rapid priming of the pump since the capacity of the suction tube is reduced while its clean dimensions (height and diameter) remain normal.

After removal of the strip 6, as shown in FIG. 2, the head 7 rises immediately under the effect of the spring 4 and the upward movement of the piston 3, driven by the common shutter, draws the product into the tank 1 via the tube 22; the product enters the metering chamber 19.

In this relaxed position, the device is sealed at the level of the exhaust valve by pressing the needle 32 against the core 33, more particularly against the internal orifice of the conduit 30. The piston 3 comprises an annular peripheral abutment 34 intended to come into contact with an annular projection here having the shape of a lip 23 carried by the upper edge of the pump body 2. This lip-forming annular projection is integrally molded with the pump body. Thus, the annular abutment 34 cooperates with this lip to define the relaxed position of the piston (and therefore the pushbutton) under the bias of the spring 4. The lip 23 is a deformable lip that can be unfolded outwardly at the demolding to allow the body to be ejected from the mold during manufacture. It is folded inwards thereafter. In other words, the lip 23 can be molded substantially in the position it occupies in Figure 1, its flexibility being sufficient for the demolding can take place by force by unfolding outwardly. It then almost resumes its normal position especially at the time of the introduction of the piston. To do this, it is important to note that the annular abutment 34 comprises a frustoconical portion 36 involved in the overturning of the lip during the final placement of the piston in the pump body. Indeed, the annular abutment comprises on one side an abutment face 35 extending radially cooperating with the lip 23 to define the relaxed position and on the other side said frustoconical portion 36 facilitating or confirming the replacement of the lip mounting.

We will see later another mode of molding of the piston and conformation of the returned lip.

It should be noted that the tubular rod 31 which extends between the core and the stop 34 has a larger diameter than the innermost portion of the piston which extends between said stop 34 and its free circular edge 40. This one is slightly flared outward to define a relatively tight contact between the piston and the inner cylindrical wall of the pump body. In addition, the radial length of the lip 23 is greater than the radial distance between the inner wall of the pump body 2 and the outer wall of the piston, in the vicinity of the lip (that is to say the outer wall of the said tubular shaft 31). With this arrangement, the innermost portion of the piston can be engaged in the central opening of the lip 23 without risk of damage to the end of the piston to be subsequently sealed in operation. Then, after passage of the frustoconical annular abutment 34, the lip 23 takes its final position and the assembly becomes indémontable due to the radial length of the lip.

According to the variant of Figure 4, the lip 23a may be segmented to the molding, that is to say formed of a plurality of circumferentially adjacent portions 60, which facilitates its elastic deformation at the establishment of the piston.

In the embodiment of Figure 1 as in that of Figure 5 which differs in the position of the piston 3 before the first use, the seal obtained by the contact between the lower end of the piston (the circular inner edge 40) and the inner wall of the pump body 2 is a priori sufficient to prevent any escape of liquid before the first use. Nevertheless, the embodiment of FIG. 1 (piston depressed before the first use) has a reinforced seal because the intake valve 17 is closed during the entire period preceding the first use.

In these two embodiments, it can be ensured that the pump body is devoid of any vent drilling, as shown in Figures 1 to 3 and 5. In this case, it is preferable that the amount of liquid introduced. filling in the tank is significantly less than the capacity of said tank (Figure 5). The watertightness is total but the reintroduction of air is no longer possible. The pump can nevertheless remain functional in suction even if a slight vacuum is generated inside the tank, because it is capable of generating a vacuum of 500 mbar, for the example described. Incomplete initial filling improves the situation. In particular, if the container is filled to one third of its total capacity, the maximum vacuum at the end of use will be of the order of 300 mbar and therefore insufficient to prevent the suction of the pump capable of generating a vacuum of 500 mbar. For example, the tank has a capacity of 1.5 ml and therefore contains 0.5 ml of product when it is filled to about one third of its capacity. This underfilling is far from being a disadvantage for the perfumer as it is not in his interest to distribute free of charge large volumes of expensive luxury goods. The perfumer therefore saves both the quantity of products offered and the cost price of the sprayer.

However, if we want to have a larger amount of liquid or further reduce the size of the sprayer, it is possible to adopt the embodiment of Figure 6. In this embodiment, substantially identical structurally to that of the 5, a vent hole 66 is formed in the wall of the pump body and opens into the metering chamber 19 in the immediate vicinity of the edge 40 of the piston when the latter is in the released position. In this embodiment, the position of the piston before the first use is said relaxed position, as shown, so that the seal is provided at the edge 40 of the piston in frictional sealing contact with the inner wall of the pump body. With this embodiment, a much larger amount of liquid can be introduced to the filling in the tank. Indeed, at each actuating stroke of the pump, the vent hole 66 is in communication with the atmosphere, which allows air to be introduced into the tank to cancel the slight depression caused by the previous operation.

In operation, when the user presses the push-button and therefore the piston 3, the pressure increases in the metering chamber 19 until the exhaust valve gives way and lets the product pass to the conduit 30 .

The calibration of the exhaust valve is adjusted by a suitable choice of materials and dimensions of the contact zone between the needle 52 and the lower orifice 32 of the conduit 30, so that it can open once the closed intake valve. Preferably, the zone of contact between the needle 52 and the edge 32 is circular and its diameter is smaller than the internal diameter of the bore 20 of the body 2, that is to say the diameter of the plug.

Considering the variant of Figure 7 which essentially represents the bottom of the metering chamber 19, it is noted that the suction tube 22 which communicates with this metering chamber protrudes therein and has a reduced thickness in the vicinity of its free end 75, this part which protrudes into the metering chamber cooperates with the grooved ball valve 51 to form the intake valve 17. The fact that the profile of the wall is thinned and more particularly tapered towards its end increases the radial elasticity of the end of the suction tube, which makes it possible to obtain sliding clamping between the zone of reduced thickness and the plug, which is suitable for reinforcing the tightness with the non-grooved surface of said bushel portion and therefore strengthen the sealing of the intake valve.

According to the variant of FIG. 8, where the elements similar to those of the preceding embodiment bear the same numerical references and will not be described again, the pump body 2a includes an outer skirt 76 enveloping an end portion 77 of said tank 1 which includes said mouth. This outer skirt, cylindrical, extends axially beyond said mouth to constitute a kind of receptacle 78 in which slides the cylindrical lateral skirt 71 of the head 7.

In the variant of Figure 9, latching means 80 are defined between the skirt and said end portion of said tank. This further improves the mounting of the pump body and makes it indémontable. To improve the aesthetic appearance of the assembly, it is preferable that the tank 1 and the outer skirt 76 of the pump body is in the extension of one another, axially, with no continuity solution to the outside. To do this, the wall of said end portion 77 of the reservoir is thinned to define externally an annular clearance of radial thickness substantially equal to the thickness of said skirt 76. The embodiment of Figure 8 also differs from previous by the structure of the intake valve. According to this variant, the end of the suction tube 22 communicating with the metering chamber 19 protrudes therein, while said other end of said shutter 5 is shaped as a bell 81, here with a cylindrical inner wall capable of styling the end portion 82 projecting into the chamber 19 and itself having a cylindrical portion surmounted by a frustoconical portion. The diameters are adapted to permit leakage of the inner wall of the bell along the outer surface of said end portion. The assembly thus constitutes the intake valve. This embodiment has several advantages. In the first place, the common shutter is easier to manufacture; it is noticeably shorter and the bell fits more easily to the assembly. In addition, it provides a larger surface area for opening the exhaust valve and closing the inlet valve. In other words, the effort to be applied to the push button to open the exhaust valve and cause spraying is less important, all things being equal.

In addition, as shown, the suction tube 22 which is no longer traversed longitudinally by a plug has an axial bore 84 of very small diameter, which promotes the priming of the pump by capillary effect.

In the variant of Figure 10, the pump body does not form the receptacle in which slides the side skirt 71. The mounting of the pump body is in accordance with the embodiment of Figure 1. In on the other hand, the reservoir 11 extends beyond the pump body by a thinned cylindrical wall portion 85, which forms the receptacle in which the lateral skirt 71 of the head 7 slides.

Of course, all the characteristics specific to the embodiments of FIGS. 8 to 10 can be adapted to the embodiments described above.

The molding of the pump body 2 of the embodiment of FIG. 8 will now be described with reference to FIGS. 11 to 13. FIG. 11 is a diagrammatic sectional view of the mold 86 formed of two parts 87, 88 engaged in one another to define between them a cavity having the shape of said pump body 2. Note that during this molding phase, the portion which must constitute the folded lip is molded in the form of a cylindrical ring 89 (possibly segmented) which allows demolding without any constraint. In a second step shown in Figure 12, the cylindrical ring 89 is folded at 90 ° with a tool 90, which initiates the formation of the lip 23. Later (Figure 13) at the time of the engagement of the piston, the frustoconical portion of the annular abutment 34 of the piston completes returning the lip to the inside of the pump body. This embodiment is advantageous but, as indicated above, it is also perfectly possible to mold the pump body with a lip already folded, the demolding of the pump body being made by force. The lip develops momentarily at the moment of opening of the mold before substantially returning to its molding position, because of its own elasticity.

Claims (15)

1. A liquid dispenser comprising a container including a mouth and a pump fitted in said mouth, said pump including:

   - a pump casing (2) in which a piston is mounted, which piston tightly slides in the pump casing so as to define a liquid proportioning chamber therewith, said pump casing including on the one hand a plug-forming outer portion (16) which provides tightness with said mouth and, on the other hand, an annular protrusion (23) extending inwards and moulded in one piece,

   - an inlet valve (17) which provides communication between said proportioning chamber and the container,

   - an outlet valve (18) which provides communication between said proportioning chamber and dispensing means,

   - a spring (4) pushing the piston towards a released position thereof, wherein the volume of the proportioning chamber is maximum,

   said piston including an annular stop (34) cooperating with said annular protrusion to define said released position, under the pushing effect of the spring,
   characterized in that the wall of said pump casing has no vent hole bored therein.
2. A dispenser according to claim 1, characterized in that said annular protrusion is shaped like a flexible lip (23).
3. A dispenser according to claim 2, characterized in that said flexible lip (23) is folded inwards with respect to the pump casing.
4. A dispenser according to claim 2 or 3, characterized in that said annular stop of said piston includes, on one side, an abutting face (35) cooperating with said lip and, on the other side, a tapered portion (36) participating in the folding of said lip when said piston is being fitted into the pump casing.
5. A dispenser according to one of claims 2 to 4, characterized in that said lip is divided into segments.
6. A dispenser according to one of claims 2 to 5, characterized in that the radial length of said lip is larger than the radial distance separating the inner wall of said pump casing and the outer wall of said piston, in the vicinity of said lip.
7. A dispenser according to claim 1, characterized in that the quantity of liquid introduced when filling the container is remarkably smaller than the capacity of said container (Figure 5).
8. A dispenser according to one of the preceding claims, characterized in that said pump casing includes an outer skirt (76) surrounding an end portion (77) of said container, including the mouth.
9. A dispenser according to claim 8, characterized in that locking means (80) are defined between said skirt and said end portion of the container.
10. A dispenser according to one of claims 8 or 9, characterized in that the wall of said container end portion (77) is thinned so as to define, outside, an annular recess, the radial thickness of which is substantially equal to the thickness of said skirt.
11. A dispenser according to one of the preceding claims, characterized in that said inlet and outlet valves comprise a common shutter (5) which can move, in an axial translation, inside the pump casing, an end of said shutter forming a needle (52) cooperating with a hole in a discharge conduit provided in said piston, so as to constitute said outlet valve and the other end of said common shutter cooperating with a suction tube of said pump casing to constitute said inlet valve.
12. A dispenser according to claim 11, characterized in that said shutter includes a needle-forming part (51) which slides lengthwise in said suction tube, in that sections of the tube and said needle-forming part are adapted to a tight sliding in the vicinity of the suction tube end which communicates with the proportioning chamber and in that at least one groove (51a) is arranged lengthwise, along said needle-forming part, which allows the passage of the liquid during the inlet phase.
13. A dispenser according to claim 12, characterized in that the end of the suction tube communicating with the proportioning chamber protrudes therein and has a reduced thickness which increases its radial flexibility, so as to strengthen tightness with the grooveless surface of said needle-forming part
14. A dispenser according to claim 11, characterized in that the other end of said shutter is shaped like a bell (81) capable of covering an end portion (82) of said suction tube which protrudes at the bottom of said proportioning chamber and of tightly sliding along the outer surface of said end portion.
15. A dispenser according to claim 14, characterized in that said suction tube includes an axial bore (84) having a very small diameter facilitating the pump priming by capillarity effect.

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