EP2229239A1

EP2229239A1 - Pump for a liquid or viscous product

Info

Publication number: EP2229239A1
Application number: EP09720170A
Authority: EP
Inventors: Jean-Yves Corbin; Mathias D'estais; Laurent Clisson
Original assignee: Capital Innovation SARL
Current assignee: FROGER, BENOIT; Capital Innovation SARL
Priority date: 2008-01-09
Filing date: 2009-01-07
Publication date: 2010-09-22
Anticipated expiration: 2029-01-07
Also published as: EP2229239B1; US20100276456A1; US8875953B2; ES2466694T3; WO2009112660A8; FR2926116B1; WO2009112660A1; FR2926116A1

Abstract

The invention relates to a pump that can be operated manually or by a utensil held in one hand by a user, characterised in that it comprises an elastically deformable chamber (10), the inside of which can contain a liquid or viscous product (8) and the outside of which can be brought into contact with the air, in a gap (7) in said chamber (10), and with a replacement fluid, in an opening (6) in said chamber. The invention is also characterised in that the chamber can be elastically deformed by pressure exerted by a user, in order to create an overpressure in the product (8) in relation to the outside, and to open the gap (7), letting a useful amount of the product (8) escape; in that the chamber (10) can elastically regain its original form when the user releases the pressure, in order to create a depression in the product (8), in the presence of a flow of replacement fluid via the opening (6) towards the inside, and to close the gap (7); and in that the wall of the chamber (10) is essentially plane to the vicinity of said gap (7).

Description

PUMP FOR LIQUID OR VISCOUS PRODUCT

The invention relates in particular to a pump that can be used for a liquid or viscous product for dishes or cosmetics, operable by means of a washing utensil held with one hand by a user, for dishwashing, or operable with reduced efforts of the hand to cause a sensation of caress, for cosmetics.

State of the art

In the field of dispensing packages for liquid or viscous fluids, such as products for washing dishes or cosmetics, are known orifices for the output of a product made by slots.

The American patent US2007 / 0262091 of Harper discloses an outlet orifice which is a sealed slot made either by the lips of two membranes pressed against one another, or by the edge of a bag tightened by an elastic element. . In a neighborhood of these sealed slots, the walls of the membranes do not constitute a plane but either two superimposed half-planes, or a cylinder.

French Patent FR2489791 of Sukop and Menrad discloses a spout valve provided with a sealed slot. In a neighborhood of this sealed slot, the walls of the beak are not a plane but two half-planes forming between them an acute angle.

The European patent EP1123746 Bonningue, discloses two sealed slots inclined faces to achieve a pump. In a neighborhood of these tight slits, the walls of their sides do not constitute a plane but two half-planes forming between them an acute angle.

International application WO2008 / 007747 of Katayama discloses a spherical valve provided with a sealed slot. In a neighborhood of the sealed slot, the walls of the valve do not constitute a plane but form a sphere. It will be noted in these prior art designs, that the walls, in the vicinity of the slots of the prior art or "sealed slots", are essentially unplaned from the outside. The sealed slots thus have effectively a good seal with respect to the outside, the external atmospheric pressure in the vicinity of these sealed slots, on their edges, to tend to keep them closed tightly, clogged. The sealed slots also unfortunately also, for this reason, a poor ergonomics for the design of a pump operable with reduced efforts of the hand to cause a sensation of caress. They have, in fact, a protrusion in the vicinity of the sealed slot which is felt by the user and which does not promote the integral collection of the liquid dispensed by the sealed slot in a continuous gesture, unlike a simple slot or " slot "within the meaning of the present invention, made in a substantially flat wall chamber in the vicinity of the slot, for example by incision of this wall.

However, a simple slot is considered busy in one direction and the other. It is therefore unthinkable at first sight to use it to pump a product from a reservoir, in a reproducible and clean way, when the reservoir is elastically deformable, the output of the product out of the tank by the slot. Indeed, for a slot made in a tank bathed in air, the passing aspect of the slot leads to escape from the product out of the tank during the deformation of the tank, and to admit air by the slot to replace the product of the tank at the disappearance of the deformation, which is not a pump but a simple outlet. It therefore does not seem easy to make a pump by a slot in a tank or a pump having as an exhaust valve a slot in a compression chamber, and there is a risk of pollution or contamination of the product tank by the outside, with such a configuration, which makes it possible to conclude that it is impossible to use a slot for a pump. Thus, in the configurations known from the prior art, the slot generally has the function of protecting the liquid of the tank against soiling or drying by the creation of a confined atmosphere. Although it is in the prior art designated "sealed slot", it is simply a protection.

In other known designs, a slit for a "stop-drop" function is also used, in particular in bottles for running liquids such as that, in particular, honey or dishwashing liquid. The function of the slot is then a flow stop, with the same difficulties of adaptation to a pump as mentioned above.

Disadvantage of the prior art

The prior art solutions of liquid dispensers using slits for dispensing liquid generally have an imperfect seal and a risk of contamination of the contents that seem to prohibit the creation of a pumping system.

Solution provided by the invention

To meet these drawbacks, the invention relates, in its most general sense, to a manually operable pump or to a utensil held in one hand by a user, which comprises an elastically deformable chamber whose interior is capable of containing a liquid product. or viscous and whose outside is intended to be brought into contact, with air, at a slot made on this chamber and brought into contact with a replacement fluid, at an opening made on said chamber, the chamber being able to deform elastically, by a support of a user, to create an overpressure in the product relative to the outside, and to open the slot, by letting escape a useful volume of product, the chamber being able to remove elastically its deformation, following the cessation of the support of the user, to create a depression in the product, in the presence of a flow of fluid replacement ent by the opening inwards and to close the slot and the wall of the chamber being substantially flat seen from the outside in the vicinity of said slot. According to advantageous variants:

the replacement fluid is said product

- the replacement fluid is air

- the opening is a hole in the room (10)

the opening is a flexible valve formed of a hole in the chamber (10) and a valve adapted to cover the hole, hermetically sealed to said product, in the presence of the overpressure, and able to leave free the circulation of replacement fluid through the hole under the effect of depression

- The chamber (10) comprises a solid part, longer and wider than the slot on which the slot is adapted to be sealed airtight, under the effect of the depression

- The chamber (10) comprises an extra thickness which is located inside the chamber, which is born on the edges of the slot and which is split from these edges over a part of its thickness, to make it more difficult to admit d air, with respect to the escape of the product, through the slot

the slot is flared towards the inside of the chamber (10), so as to facilitate the escape of the product, with respect to the admission of air, through the slot

the chamber (10) is first elastically deformable by pinching by means of a finger of the user's hand, creating in the chamber a first part comprising the slot and a second part comprising the opening, then is deformable by sliding the finger on the chamber (10), maintaining the nip, to escape the product of the first part by the slot and to remove the deformation of the second part and make it admit the replacement fluid the chamber is composed of a first and a second subassemblies and means for connecting these subassemblies in a sealed manner to the product, to the air and to the replacement fluid, the first subassembly comprising the slot and the second subset including the opening

The invention also relates to the application of said pump or one of its variants to a dish or cosmetic container, connected to said opening, and deformable or provided with an air inlet, for producing a dispenser of said product operable by a user, manually or using a device held in one hand.

Detailed description of a non-limiting embodiment of the invention

The description of the invention is made for its embodiments, with reference to:

- Figure 1 shows in section, the pump in its application to a tank of product for the dishes

- Figures 2a and 2b showing in section, the pump in its application to a cosmetic pot which is a product tank of the type "bag in box".

The invention is shown in FIG. 1 in its application to a tank (1) for washing dishes provided with an air inlet (2), a cup (3), connected to a pump according to the invention. invention comprising a chamber (10) elastically deformable and bathed in an external medium that is air, a slot (7) and an opening (6), the chamber containing a product (8) liquid or viscous, the tank resting on a sole (4), provided with a hinge (5) and a portion (9) forming a plug.

With reference to this figure, a user presses the cup (3) and deforms the pump chamber (10) between the cup and the sole (4). The product (8) escapes from the deformed chamber through the slot and the opening (6) which is a valve elastically deformable over a hole, under the effect of the user pressure transmitted by the product (8), which creates an overpressure in the product relative to the external environment. The valve covers the hole and closes it, preventing the product from coming out more through the opening. When the user releases his support, the chamber tends to elastically resume its form of rest, creating a depression in the product relative to the outside environment. The valve resumes its rest position, leaving the hole open and allowing the product to enter the reservoir into the chamber, replacing the product that escaped through the slot during deformation. In an advantageous configuration for limiting the liquid discharges from the chamber to the reservoir, the valve may be able to close the opening in the rest position and during the overpressure in the product and to open only under the effect depression in the product.

A valve according to the invention will generally be able to cover the hole in the presence of the overpressure and to leave this hole open in the presence of the vacuum. A slot according to the invention will generally be able to open in the presence of the overpressure and to close in the presence of the depression. The slot and the valve according to the invention will be chosen so that an increase in the value of the pressure, starting from an equality of the internal and external pressures around the chamber, leads to the closure of the valve and to the opening of the slot and that a decrease in pressure from a situation where the slot is open and the closed valve lead to a closure of the slot and an opening of the valve corresponding to an aspiration of the replacement fluid or the product contained in the tank, by the opening of said valve, with a choice of admission by the valve allowing the reduction of the pressure and its transformation into depression, without exceeding a value of the depression which would open the slot by deformation to the inside the room and admit air.

If the slot and the opening according to the invention are adapted so that the diameter of the opening and the characteristics of the slot allow an escape of the product preferably by the slot, when the chamber is deformed, rather than by the opening and conversely an admission of a volume of product or replacement fluid through the opening rather than a volume of air through the slot, during the disappearance of the deformation of the chamber, then it is possible to pump the product from the tank to the cup by elastic deformation of the chamber and disappearance of this deformation.

With a valve, it will be possible to play on the rigidity of the valve so that the closing of the hole of the opening intervenes at a pressure on the valve lower than that causing the opening of the slot, this pressure being able to be zero if the valve closes the hole at equal pressures around or on both sides or inside and outside the chamber. In this case, and for a slot obtained by simple incision of the chamber, if it is made of an elastomer, the relaxation of the support of the user will allow the opening of the hole by the valve, the slot being closed , and the replacement product admission through the opening rather than air through the slot.

It is thus possible to have, for any type of chamber and slot, a criterion for optimizing the opening to obtain a pump according to the invention. A valve or opening (6) as shown in FIG. 1 can thus be produced by a zone of cylindrical elastomer of thickness 1.5 mm and diameter 12 mm, attached or bi-injected into the cup (3) so that it is held firmly on the periphery. It can be a silicone type elastomer of hardness 40 Shore A. The through slot (7) can be 6mm in length which gives it the possibility to open during a manual compression of the chamber dome with a force of the order of 2 Newton, while being sufficiently airtight at the entrance to resist the air during the depression generated by the volume recovery of the chamber, so that the volume recovery moves the valve of inlet (6) closing the opening connecting the chamber (10) to the reservoir (1) and makes a consequent fluid call from the reservoir, that is to say a volume that can for example reach 0.2ml .

This simple configuration works for many types of products, for example a conventional dishwashing liquid of 500 centipoise viscosity. For really different viscosities, or to obtain different doses, the parameters involved will have to evolve, and in particular the parameters of the membrane material, the size of the slot, as well as the design of the elastic compressible zone. It should be noted that it is consistent with information of the invention to admit air through the opening, if the chamber serves as a product reservoir. The chamber may in this case be advantageously provided with a dip tube for supplying product, the open slot. The chamber may advantageously be in the form of a piston sliding in a pump body and crushing a spring to contain a cosmetic product.

The opening of the chamber can be reduced to a calibrated hole according to the slot, without any valve. In this case, the replacement fluid will preferably be liquid or viscous product, given predictable product discharges between the chamber and the reservoir. A valve closing in the absence of depression of the tank relative to the outside, that is to say closing in the presence of overpressure of the chamber relative to the outside or at equal pressure of the chamber relative to the outside, is nevertheless more favorable to the characteristics of the invention and the dosage of the delivered product.

To decrease the opening pressure of the slot, it is possible to flare into the chamber, making his lips not touching the inside of the room. The depression causing the admission of air through the slot remains essentially unchanged in this operation and the escape of the product is facilitated in this configuration, in the sense that it takes place for less overpressure than without flaring. This flare can, for example, be a form of slot lips in "U" (half-cylinder flare) or "V" (flare in ravine). The inward widening of the slot is defined by the fact that the edges of the slot are not in contact inside the chamber and are in contact with the outside, the profile of said edges of the slot being variable between these two extremes. It is therefore possible, as indicated above, to flare the slot towards the interior of the chamber, to obtain an asymmetrical behavior, by making its lips not touching on the inside face of the chamber. This flare can be of the order of 30 to 70%. Ideally it appears that with a flare of the order of 50% the depression causing the admission of air through the slot then remains essentially unchanged in this operation and the escape of the product is greatly facilitated in this configuration, in the sense that it takes place for less overpressure than without flaring.

It is also possible to provide under the slot on the side of the interior of the chamber, a part on which the slot rests in the absence of deformation, plated on the piece airtight, the room being wider and long as the slot. This part opposes the admission of air through the slot without changing the opening pressure of the slot, which allows escape of the product.

This support part or support, on which all or part of the slot rests in the absence of deformation of the slot, brakes the deformation of the slot towards the interior of the chamber so that it considerably increases the penetration seal return of air or liquid. This support piece is a priori fixed and rigid, that is to say in a configuration such as that of FIG. 1, linked to the body of the pump (10). Nevertheless, it can be provided that this part is flexible or semi-flexible in order to avoid its perception by the user or for design and operating choices. This can be achieved during the injection of the membrane which comprises, in its lower face a hemispherical grid rising in its center to form said support.

It is possible to provide that this support piece, in a flexible or rigid configuration, is wider and longer than the slot. This piece then makes it possible to very clearly raise the level of air penetration seal when the slot rests on it.

Again, to also obtain an asymmetric behavior in pressure and depression of the slot according to the invention, another configuration is to mold a protrusion of the chamber under the slot, that is to say inside the chamber. This excrescence is split over part of its height when the incision of the slot is made by the outside of the chamber. This protrusion participates in a very simple way to reinforce the penetration resistance of the air or liquids by the slit, in the chamber, without significantly reducing its opening out of the chamber. The possibility of playing on the opening and the slot makes it possible to apply the pump according to the invention to a tank of product for the dishes or cosmetics, to extract the contents by a pressure that can be low and to allow the use of the hand or washing utensil.

In order to practically achieve the invention, certain variations and indications below, may be usefully implemented by a person skilled in the art.

The behavior of the device can be greatly improved by different direct or indirect interventions on the membrane. These interventions will have the following objectives:

- facilitate the liquid outlet by the slot to the outside, in particular to limit the pressure force required to trigger the fluid outlet which also lowers the minimum overpressure in the chamber necessary to obtain the start of the flow of liquid and thus avoids unwanted spouting effects of the product to the outside.

- Curb the infiltration of air or liquid from the outside to the inside, that is to say obtain a better seal of the slot back to limit the penetration of air or dirt through the slot, but also allow the slot to resist a significant depression, which allows the pump to generate a significant depression, in particular to call a viscous liquid in the pump body, or a liquid significantly lower than the pump body, for example located 15 or 20cm from the pump body as can be found in some bottles with plunger or soft bags type "bag-in-box".

It is clear that these objectives may conflict. It is therefore for the designer to seek the compromise that he wishes based in particular on the use to be made of the pump according to the invention (gesture, effort, desired dose, etc.), the viscosity of the product, and the product storage conditions or constraints.

To find this compromise, said designer has all the parameters of the slot and its environment, namely, all the intrinsic characteristics of the material, the thickness of the membrane and the perimeter of the membrane left free, the length of the slot . It also has compressible volume parameters of the chamber, nervousness of the return of the chamber in initial position after compression, and behavior of the intake valve. Routine tests then allow the optimization of the invention by simple execution work.

These fundamental parameters are usable by the designer with a slot a priori as busy and sealed in one direction as in the other. This phenomenon does not prevent the pump operation described above, especially with a valve because the fact that the pump actually operates is due to a resistance, the passage of the product discharge, higher for the intake valve operating in closing, in presence of overpressure, with respect to the resistance to the opening of the outlet slot on the one hand, and to a lower resistance of the inlet intake valve with respect to the penetration of air or liquid from the outside by the slot, on the other hand. The combination of these features ensures product flow from the valve or hole to the slot, and creating a pump with very simple means.

Advantageously, the designer will also find in the following paragraphs useful complementary solutions that allow him to more elegantly solve some of the contradictions or oppositions underlying the two main objectives presented above and will allow him to design more efficient, simpler and also less expensive, for example by using thinner and less powerful materials such as for example polyurethane or even LDPE 0.7mm thick. These solutions are intended in particular to provide the slot asymmetrical behavior, that is to say that it behaves more or less like a fluidic diode, facilitating the passage of a fluid or a liquid product in one direction through the slot, to the detriment of the other direction, the opening of the slot being easier for a positive pressure or positive pressure difference between its faces than for a negative pressure or negative pressure between the same faces or the slot in the room opening more easily when an overpressure is applied on the inside rather than on the outside of the chamber.

When the product is put under overpressure, the membrane is naturally bombarded which allows the separation of the membrane of the support part and the escape of the product is done without significantly changing the opening pressure of the slot. Conversely, during a depression in the room, the slot is pressed against the support piece which makes it completely waterproof.

It is also possible to work on the general topography of the membrane. Thus, a convex membrane for the user will promote the opening of the slot and thus the easy exit of liquid. A concave membrane for the user will play against the deformation of the membrane to open the slot, however, the choice of a concave membrane may be justified for reasons of use, particularly to facilitate the collection of the exfiltered product, or for technical reasons like the good static behavior of the device. Indeed, on some designs such as that shown in FIG 1., the reservoir is located above the slot, it must therefore at least be a barrier to the natural flow of liquid by gravity and the choice of a membrane concave for the user is a choice that may be relevant.

Finally, it is possible to create a pre-tension of the membrane. For this we inject a membrane whose perimeter is slightly smaller than the perimeter of pause, and only in the direction of the slot itself. For example, an elliptical slotted membrane is produced inscribed in the laying circle, the slit being cut in the short axis of the ellipse, and this ellipse is then set to a cylindrical shape. The membrane thus has a dynamic interesting which makes it possible to reinforce the effects of sealing in the rest position, without significantly penalizing the dynamic opening towards the outside.

It will be noted in all these designs that the zone of the membrane or wall of the chamber in the vicinity of the slot, is always provided essentially flat view from the outside. When a concave or convex shape has been described, it should be understood that the zone in the direct vicinity of the slot and deformable in order to obtain the liquid, is a zone of large radius of curvature, of the order of 30 mm. . For concave areas, one can imagine configurations with a smaller radius of curvature, of the order of 10mm which corresponds more or less or diameter of the finger.

In any case, the topography of the room should be essentially flat and smooth around the slot to facilitate the collection of the product in an intuitive gesture and without leaving any retentions of products in the area.

Of course, it will be possible to add printed drawings, motifs in slight reliefs or flocked fibers, but these additional elements must not be too protruding so as not to create significant retentions around the slot which could cause problems hygiene.

It will be noted here that the sealing of the slot is due to the tensions of the material itself, possibly coupled to the clogging effects of the membrane on the rest support described above. It is important to consider that it is in no way a seal due to atmospheric pressure as in some high-expansion flexible valves, where the lips of the valve are pressed against each other by the difference of pressure between the interior of a volume and the outside at atmospheric pressure.

The chamber can also be deformable by pinching, as shown in Figures 2A and 2B with a finger or utensil, and by sliding of the nip along the chamber towards the slot. In this case, the room is divided after nipping into two deformed parts. In the course of sliding, the product is discharged through the slot of the first part and the second part containing the opening evolves towards the entire chamber undistorted and thus fills with fluid or replacement product, through the opening. The invention can therefore realize a manual or activated pump by a washing utensil, capable of producing pinching and sliding, for extracting the product from a product reservoir, dishwashing liquid or cosmetic, to a slot and put it available to a user.

The invention is thus represented in FIG. 2A and FIG. 2B (FIG. 2A and 2B) in its application to a pot (11) overhung with a sampling zone (13), connected to a pump according to the invention comprising a chamber (20) resiliently deformable and bathed in an external medium which is air, a slot (17) and an opening (16), the chamber (20) containing a liquid or viscous product (18), comprising a blade (15) ) forming a partition between the chamber and the reservoir, communicating through the opening (16), the reservoir comprising a flexible bag (14) connected to the opening (16) and protected by the walls of the pot (11) provided with a air inlet (12).

Referring to Figure 2A, the chamber (20) is deformable by pinching with the fingers or a tool, as can be seen in Figure 2B. The geometry of the blade (15) is slightly elongated bowl so that the chamber (20) at rest is a channel, shown in Figure 2A in its longitudinal section and that during the deformation created by the pressure of a finger the chamber (20) is clogged at the pinch point so that the chamber (20) is divided after twisting into two deformed portions (201) and (202), the portion (201) having the slot (17), and the part (202) having the opening (16). By sliding the nip along the chamber towards the slot (17), that is to say in the direction of the arrow (F) of Figure 2B, the product is compressed downstream of the nip and discharged by the slot (17) and the second part containing the opening (16) gradually resumes its shape until it evolves towards the entire undistorted chamber and thus fills with fluid from the reservoir, through the opening (16) . If the finger continues to move towards the slot, when it reaches the slot (17), almost all the liquid trapped in the portion (201) has been removed and the finger thus collecting the liquid. In this setting form, it is noted the interest that the slot is positioned precisely at the end of the channel so that in a single flexible and continuous gesture, the user generates the expulsion of the liquid and its collection. When the finger leaves the surface (13), it resumes its initial form presented at rest as visible in Figure (2A). The return to the initial shape is achieved by the shape memory, or ability to elastically recover its shape after deformation, of the material of the deformable zone, for example a 40 Shore A hardness elastomer used in thickness 1 mm for a fluid cream or 1.5mm see 2mm for a thicker cream. Or may also accompany the shape memory of the material by a spring effect, for example a very aerated foam type filter foam, or fine protrusions molded with the elastomer acting spring.

The chamber may also be removable into a part or subassembly containing the slot and another containing the opening for replacement of one or other of these elements or subassembly without discarding or facilitating the assembly. the realization.

In view of the present application, a first criterion of the invention appears to be a first strictly positive difference between the product flow through the slot which is useful and the admission of a volume of air through the slot which is parasitic. A null value of this criterion corresponds, for example, to a simple outlet consisting of a slot and not a pump. The designer will seek to minimize this parasitic effect and can be obtained with the means described above, devices according to the invention for which the admission of a volume of stray air is insignificant.

As the pumping cycles progress, the air content of the chamber contents may be varied. During the priming phases of the pump the contents of the chamber may consist solely of product or only air. During the phases of use, a quantity of air can also be admitted in the room. For purposes of simplification, the term product (8) will designate the contents of the chamber (10) during the phases of use.

A second criterion of the invention also appears to be the equality of this first difference to a second difference between the fluid volume of replacement debited through the opening upon cessation of support and the volume of product delivered by the opening during the support. The volume of product dispensed outside the chamber is then exactly compensated by a volume of replacement fluid and the chamber completely reformed at the end of a cycle of support / release of the user. The designer will seek a priori to optimize the volume of expelled liquid or volume useful for a nominal deformation of the chamber so that it will be more willing to open a valve ensuring leakage of fluid to the insignificant reservoir.

The satisfaction of the first criterion distinguishes the invention from a slit exit orifice, obtained for a first zero difference, and the second criterion distinguishes the invention from a plastically deformable tank provided with a slot, obtained for an inequality. .

Depending on the product flow characteristics and the replacement fluid through the opening, it is possible with the invention to obtain a useful product output, for a given user's support, by adjusting the possible product flow rate. , for example taking into account the viscosity of this product, so that the flow does not prevent the overpressure to reach a value causing the opening of the slot. It is also possible symmetrically to adjust the elasticity of the chamber to the possible flow of replacement fluid through the opening, for example taking into account the viscosity of the replacement fluid, which may be the product or air including , to allow the vacuum to remain below a value causing the opening of the slot, by depression, and thus limit the admission of a volume of stray air in the room.

The invention is therefore, in all its generality, a pump whose outlet orifice is a slot and is capable of industrial application in the field of liquid dispensers for dishes or product for cosmetics.

Claims

1 - Pump operable manually or by a utensil held in one hand by a user, characterized in that it comprises a chamber (10) elastically deformable, whose interior is adapted to contain a liquid or viscous product (8) and the outside is intended to be brought into contact with air at a slot (7) formed on the chamber (10) and brought into contact with a replacement fluid at an opening ( 6) formed on said chamber, in that the chamber is able to deform elastically, by a user's support, to create an overpressure in the product (8) with respect to the outside, and to open the slot ( 7), by releasing a useful volume of product (8), in that the chamber (10) is able to remove elastically its deformation, following the cessation of the support of the user, to create a depression in the product (8), in the presence of a replacement fluid flow through the open ure (6) inwards, and to close the slot (7), and in that the wall of the chamber (10) is substantially piane seen from the outside in the vicinity of said slot (7).

2 - Pump according to claim 1 wherein the opening is a hole in the chamber (10)

3 - Pump according to claim 1 wherein the opening is a flexible valve formed of a hole in the chamber (10) and a valve adapted to cover the hole, hermetically to said product, in the presence of the overpressure, and able to leave free circulation of replacement fluid through the hole under the effect of depression

4 - Pump according to at least one of claims 1 to 3 wherein the chamber (10) comprises a solid portion, longer and wider than the slot on which the slot is adapted to be sealed airtight , under the effect of depression 5 - Pump according to at least one of claims 1 to 3 wherein the chamber (10) comprises an extra thickness which is located inside the chamber, which is born on the edges of the slot and which is split from these edges over a part of its thickness, to make it more difficult to admit air, with respect to the escape of the product, through the slot

6 - Pump according to at least one of claims 1 to 5 wherein the slot is flared towards the inside of the chamber (10), so as to facilitate the escape of the product, relative to the air intake , by the slot

7 - Pump according to at least one of claims 1 to 6, wherein the chamber (10) is first elastically deformable by pinching by means of a finger of the hand of the user, creating in the room a first part comprising the slot and a second part comprising the opening, then is deformable by sliding the finger on the chamber (10), maintaining the nip, to escape the product of the first part by the slot and to remove the deformation of the second part and admit the replacement fluid

8 - Pump according to at least one of claims 1 to 7 wherein the chamber is composed of a first and a second subassembly and means for connecting these subsets tightly to the product, to the and the replacement fluid, the first subassembly comprising the slot and the second subassembly including the opening

9 - Pump according to at least one of claims 1 to 8, wherein the replacement fluid is product

10 - Application of the pump according to at least one of claims 1 to 9, a tank of detergent or cosmetic product, connected to said opening, and deformable or provided with an air inlet, for producing a dispenser of said product operable by a user, manually or using a device held in one hand.