EP0888823B1 - Dispenser for liquid or pasty material comprising pumping means - Google Patents

Dispenser for liquid or pasty material comprising pumping means Download PDF

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Publication number
EP0888823B1
EP0888823B1 EP98401483A EP98401483A EP0888823B1 EP 0888823 B1 EP0888823 B1 EP 0888823B1 EP 98401483 A EP98401483 A EP 98401483A EP 98401483 A EP98401483 A EP 98401483A EP 0888823 B1 EP0888823 B1 EP 0888823B1
Authority
EP
European Patent Office
Prior art keywords
piston
dispensing head
rigid
membrane
annular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98401483A
Other languages
German (de)
French (fr)
Other versions
EP0888823A1 (en
Inventor
Jean-Louis H. Gueret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOreal SA
Original Assignee
LOreal SA
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Filing date
Publication date
Priority to FR9708468 priority Critical
Priority to FR9708468A priority patent/FR2765560B1/en
Application filed by LOreal SA filed Critical LOreal SA
Publication of EP0888823A1 publication Critical patent/EP0888823A1/en
Application granted granted Critical
Publication of EP0888823B1 publication Critical patent/EP0888823B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/30Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus the flow being effected by a pump
    • B05B11/3001Piston pumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/0005Components or details
    • B05B11/0037Containers
    • B05B11/0039Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
    • B05B11/0044Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure by ingress of atmospheric air into the container, i.e. with venting means
    • B05B11/00446Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure by ingress of atmospheric air into the container, i.e. with venting means the means being located at the bottom of the container or of an enclosure surrounding the container
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/0005Components or details
    • B05B11/0062Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/0072A valve member forming part of an outlet opening
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/30Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus the flow being effected by a pump
    • B05B11/3001Piston pumps
    • B05B11/3004Piston pumps comprising a movable cylinder and a stationary piston
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/30Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus the flow being effected by a pump
    • B05B11/3042Components or details
    • B05B11/3066Pump inlet valves
    • B05B11/3067Pump inlet valves actuated by pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/0005Components or details
    • B05B11/0037Containers
    • B05B11/0039Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
    • B05B11/0041Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure without contact of the fluid remaining in the container with the atmospheric air
    • B05B11/00412Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure without contact of the fluid remaining in the container with the atmospheric air the means being a collapsible or foldable bag or membrane
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit, i.e. unitary, hand-held apparatus comprising a container and a discharge nozzle attached thereto, in which flow of liquid or other fluent material is produced by the muscular energy of the operator at the moment of use or by an equivalent manipulator independent from the apparatus
    • B05B11/0005Components or details
    • B05B11/0037Containers
    • B05B11/0039Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
    • B05B11/0041Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure without contact of the fluid remaining in the container with the atmospheric air
    • B05B11/00416Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure without contact of the fluid remaining in the container with the atmospheric air the means being a following piston

Description

The present invention relates to a dispensing head, as well as to a distributor equipped with this dispensing head for a liquid product or pasty comprising a reservoir for the product to be dispensed, means for pumping being provided actuable by a pusher, in order to cause the distribution of a dose of product.

The distributor targeted by the invention is of the type with a variable volume reservoir, this reservoir being constituted, for example, by a flexible pocket or by a rigid cylindrical tank fitted with a follower piston.

This dispenser is intended, more particularly, to distribute and apply a cosmetic, dermatological or food product, such as for example a lotion, cream, shampoo or liquid foundation, gel, but it it is possible to distribute any kind of liquid or pasty product. Such dispenser advantageously comes in a compact form, with a small capacity tank, ranging, for example, from ten ml up to a few hundred ml.

We know, for example from document EP-A-0 733 559, in the name of plaintiff, a distributor of the kind described above, comprising a reservoir retractable, connected by a first valve to a variable volume chamber under the action of a pusher. This variable volume chamber is itself connected to the outside by a second valve. The pusher has a body which constitutes, with a piston integral with the reservoir, the variable volume chamber. The piston is provided with a central passage, its free end, on the side of the chamber being capped by an elastomer part which fills, at the same time, the function of a sealing lip and a one-way valve flap, this valve being able to open towards the variable volume chamber, in response to a depression prevailing in the room.

The tests carried out by the applicant have shown that the valve according to EP-A-0 733 559 has two drawbacks:

  • the adjustment of a sliding sealing lip made of elastomeric material between two rigid walls is difficult to achieve, in particular when a piston is produced whose diameter is only a few mm;
  • the mobility of the piston is difficult to ensure, because according to their chemical composition, certain products tend to swell the elastomeric material constituting the piston, the latter then undergoing expansion, which causes it to be blocked in the chamber, and / or the deformation of the valve.

Furthermore, by document DE-U-94 19268, we know a distributor comprising a variable volume compression chamber, in communication with a piston, the piston comprising a central passage of product closed by a one-way valve. The piston is inserted inside a supply chimney, in communication with a tank containing the product. The valve is made in the form of an elastic membrane annular, the central orifice of which is closed by a pin carried by the piston. The membrane connects to a cylindrical sleeve threaded into a groove annular which is provided with the upper end of the piston. The sleeve with the valve is made in a single piece of elastomer.

Such an embodiment has several drawbacks, either from the point of view manufacturing, either from an operational point of view: in fact, when mounting the piston, it is necessary to ensure a first seal between the piston and the sleeve, while ensuring the correct axial positioning of the membrane relative to with picot. In the absence of precise positioning of the membrane, the pump has leaks, or at least a non-constant flow.

In addition, a second seal must be provided between the chimney and the piston. In addition, by mounting the piston inside of the supply chimney, the passage section of the product is limited, this which leads to a pressure drop, causing a hard operation of the pump. If this passage section is increased, a pump is obtained bulky that cannot be combined with a distribution head intended styling of small capacity tanks. In total, two stages are necessary for mounting the piston in the pump. Failing assembly waterproof of the above parts, the operating reliability of the pump is compromised.

Also, the present invention aims to remedy the drawbacks of the art and ensure smooth and reliable operation during use. The dispenser according to the invention also has a rapid response when actuation of the pusher, unlike distributors which have a ball valve. The invention relates, in particular, to the use of a valve piston, which are easy to manufacture and assemble, at a cost advantageous, and also exhibiting great precision.

The present invention relates to a dispensing head of a product of liquid to pasty consistency contained in a reservoir, comprising a push button movable axially, said push button having a body whose internal walls define a variable volume pumping chamber, having an inlet for the product, closed by an intake valve carried by a piston, the piston having at least one sealing lip in contact with which the internal walls move between a high axial position and a low axial position, the passage from the low axial position to the high axial position causing the product to be sucked into the pumping chamber via the inlet valve, and the passage from the high position to the low position causing the product to be drawn out through a distribution valve closing an outlet orifice of said chamber, elastic return means being provided to return the push button ir in the high position, the intake valve and the piston being mounted on a hoop surmounting said reservoir, said hoop comprising a seat for the intake valve so as to prevent any return of product to the reservoir, the piston comprising a central part made in the form of a membrane of an elastically deformable material, and in which is formed at least one opening so as to form said intake valve, corresponding to the preamble of claim 1.

This dispensing head is characterized in that the piston is formed from a annular part made of a rigid or semi-rigid material, different from the material of the central part, the central part forming a single piece with the part annular.

The present invention also relates to a dispenser equipped with the head described above.

According to an interesting aspect of the invention, said annular part is shaped to ensure the mounting of the piston on a supply channel carrying said seat, this annular part being positioned outside said channel feed. In this way, the inlet channel does not present any restriction, and pressure losses are avoided during actuation of the pump.

Advantageously, the membrane is mounted on the seat so as to close the opening in a leaktight manner , at least when there is an overpressure inside the chamber , which is particularly suitable for the distribution of relatively viscous products.

In particular, the membrane is mounted on the seat so as to close the opening in a sealed manner in the absence of vacuum inside the chamber , which is particularly suitable for dispensing relatively fluid products.

In order to increase the operating reliability of this dispensing head, the the annular part of the piston may advantageously include a portion forming a stop so as to ensure precise positioning along the axis longitudinal of the pump, from the central part of the piston to the seat.

Advantageously, the elastically deformable membrane is fixed to the end part of the piston during the manufacture of the latter. To this end, the inlet valve and the annular part can be produced by bi-injection or overmolding of two compatible materials. For the injection of membrane, preferably an elastomeric material is used, in particular thermoplastic, and more particularly a material having a hardness Shore A between 15 and 90. Generally, the material resiliently deformable must be able to create, with the rigid or semi-rigid material, a solid bond during the manufacture of the piston. So, by injecting into a suitable mold, for example, first rigid or semi-rigid material for form the piston, and then over-injecting the elastomeric material of the membrane, we create this connection, by thermofusion, between the two materials. It is also possible to operate in the opposite direction. In some cases, it is also possible to overmold two incompatible materials together, condition to provide anchoring profiles.

However, advantageously, the elastomeric material is chosen, in the group of thermoplastic elastomers, such as the group of propylene / ethylene copolymers; polyether blockamides; polyvinyls ; terpolymers of ethylene, propylene and a diene (EPDM); of the styrene-butadiene block polymers (SBS); polymers of block styrene-ethylene-butadiene (SEBS-SIS); polyurethanes thermoplastics; mixtures of polypropylene with one of the elastomers following: block styrene-ethylene-butadiene polymers (SEBS-SIS); terpolymers of ethylene, propylene and a diene (EPDM); polymers of block styrene-butadiene (SBS). It is also possible to use, as flexible material, silicone elastomers, rubbers butyl or nitrile, latex or fluorinated elastomers.

It is also possible to make the membrane from natural rubber or synthetic like vulcanizable elastomers, nitrile rubbers or polybutadienes etc ...; in this case, the membrane can be glued or slammed on the piston or fixed by any other appropriate means.

As for the realization of the piston itself, advantageously, the rigid or semi-rigid material is chosen from polypropylenes, high and low density polyethylenes, polyvinyl chlorides (PVC), polyacetals, ethylene vinyl acetates and mixtures thereof, etc. Advantageously, the piston has a generally cylindrical shape, each end of the cylinder comprising an annular part in the form of a lip sealing. To ensure good contact of these sealing lips with the inner wall of the pumping chamber, these lips, seen in section, can have a decreasing thickness towards their free end, which gives them greater flexibility.

According to a first embodiment of the invention, the membrane is pierced in its center of an orifice of section smaller than the section of the seat, this seat being centered at the top of a feed channel formed by the hoop and crossing the piston. Advantageously, the membrane is in a form circular, similar to a flat washer. In this configuration, the piston hollow is provided with a central pin acting as a seat, arranged so as to come into contact with the edges of the orifice of the membrane. This provision constitutes a unidirectional valve allowing the admission of product in the pumping chamber. When an overpressure reigns in this chamber, the membrane, and in particular the edges of the orifice, is (are) in sealed support on the seat, while a depression in said chamber causes the edges of the orifice of the membrane of its seat to take off, allowing the aspiration of the product. To give more flexibility to this membrane, the edge of the orifice may be provided with one or more slots radial, or in the form of circular fractions.

Advantageously, the pin has a concave surface, forming thus a thin peripheral edge which, in a state of rest, rests on the membrane so as to ensure a perfect seal.

According to a second embodiment, the membrane has a plurality orifices, in the form of concentric slots. In this case, the seat is consisting of an annular part at the top of a supply channel formed by the fret. Advantageously, this annular part may include an edge annular, intended to rest on the membrane, in the rest position. Of preferably, the slots are arranged discontinuously, according to a circular line. In this configuration, the hollow piston is provided with an edge enlarged end, forming a seat, arranged so as to come into contact with the membrane at the level of the slots. As in the first mode of realization, this arrangement constitutes the product intake valve in the pumping chamber. When there is overpressure in this room, the membrane, and in particular the edges of the slots, is (are) in leaktight support on the seat, while a depression causes the membrane to take off of its seat allowing the aspiration of the product.

To further increase the flexibility of the membrane, its thickness can be variable. So the membrane area, or the surrounding regions, which are in contact with the seat, may have a smaller thickness than the rest of the membrane.

According to a preferred embodiment of the dispenser of the invention, the hoop comprising the inlet channel is centered on the longitudinal axis which is provided with the distributor, and opens straight onto the intake valve of the head distribution, this supply channel being surrounded by an annular portion forming a cavity all around the inlet channel, said cavity being bounded, opposite the inlet channel, by an outer annular skirt carrying hooking means on the dispenser, for example a groove or an annular rib.

Advantageously, the cavity has a transverse wall, between the inlet channel and the outer annular skirt, the return means elastics being positioned between a shoulder formed by the button pusher and this transverse wall. The recall means are made up, for example, by a metal coil spring, arranged around the pumping chamber and the piston in said cavity. In a variant of embodiment, the spring can be obtained directly by molding of material rigid or semi-rigid plastic, together with the bottom of the push button with which it is integral.

According to a first possible embodiment, the reservoir consists of a soft and flexible pocket, having an open end secured to the hoop and in communication with said supply channel formed in the piston. In in this case, the open end of the pocket is closed by the hoop which has the attachment means cooperating with an end edge of an enclosure rigid or semi-rigid outer surrounding said pocket.

According to a second possible embodiment, the reservoir consists of a rigid or semi-rigid enclosure, in communication with the inlet channel, the attachment means cooperating with an end edge of said enclosure rigid or semi-rigid external, a follower piston being disposed in the bottom of the tank. This follower piston is able to advance automatically as and when measurement of product withdrawal along the longitudinal axis of the distributor in response to the vacuum prevailing in the pumping.

According to another interesting aspect of the invention, the push button comprising the distribution valve, is provided with a distribution channel whose a first end opens into the pumping chamber, the second end being closed by said distribution valve. For this purpose, this valve distribution is made of elastomeric material and elastic support watertight against a seat formed around said second end of the channel dispensing, capable of opening when a product push is exerted, and apply against the seat when a vacuum occurs inside the variable volume chamber and distribution channel.

To better understand the present invention, we will describe now, by way of purely illustrative and in no way limiting examples, two embodiments of dispensers according to the invention, shown in the accompanying drawings.

Figure 1 shows a schematic view in axial section of a dispenser according to a first embodiment of the invention.

Figure 2 shows an axial view of the piston according to the distributor of figure 1.

Figure 3 shows a perspective view of the piston according to dispenser of figure 1.

FIG. 4 represents a schematic view in axial section of a dispenser according to a second embodiment of the invention.

FIG. 5 represents a perspective view of the piston according to dispenser of figure 4.

Figure 6 shows a perspective view of an alternative embodiment of the piston of figure 3.

We see in Figure 1 a distributor designated as a whole by the reference 1 comprising a flexible tank 2, provided with a hoop 4, the periphery 6 clicks, by a groove 6a / bead 6b system on the part upper side of a rigid external enclosure 8 which surrounds the flexible tank 2. The hoop 4 forms a cup 5 having a cylindrical side wall external 5a and a transverse bottom 5b.

The flexible tank is formed by a cylindrical sheath, made for example into a flexible multi-layer polyethylene / aluminum / polyethylene sheet. The upper part 2a of the flexible tank 2 is welded or glued to the wall side 5a of the bowl 5. After filling the tank by its end lower in product P to be dispensed, this end is closed by welding, the welding line forming a bottom 3.

The reservoir 2 thus formed, forms a flexible pocket, having the advantage to be able to deform as the product P is distributed. The rigid enclosure 8 surrounding the flexible tank 2 is provided with an orifice vent 8a intended to balance the internal pressure prevailing in the volume defined between pocket 2 and enclosure 8.

The center of the bowl 5 is open and extended upwards by a central chimney 10 constituting the base of a piston 12. The chimney central 10 defines a product suction channel 11 of which a first end is in communication with the tank, the second end carrying the piston 12. The piston 12 is hollow and is provided with a central orifice 14 formed in an elastic membrane 16 which has been deposited, by bi-injection a suitable elastomeric thermoplastic material, for example example of Santoprene® (EPDM, sold by the company MONSANTO) on the upper end of the piston 12. The piston 12 has a general shape cylindrical, each end of the cylinder being provided with a lip circular sealing 12a and 12b (see Figure 3) of small thickness, shaped tapered at its free edge. Advantageously, the piston is made in one semi-rigid material, such as low density polyethylene, capable of imparting to the sealing lips 12a and 12b a certain flexibility. A central pin 18 is provided to close the orifice 14 in the rest state. Picot 18 is held in place by radial lugs 20 integral with the end upper 10a of the central chimney 10. The upper end 10a is in support against an annular stop 12c made inside the piston 12, allowing precise positioning of the membrane 16 relative to the pin 18.

The membrane 16 and the pin form a valve intended for the admission of the product P in a variable volume pumping chamber 22. This chamber 22 is defined by the internal volume of a cylindrical tube 24 which makes part of a push button 26. The tube 24 has an internal diameter sufficient to allow sealed sliding of the piston 12 and extends halfway up the side wall 5a in the bowl 5.

The tube 24 comprises a circular plate 28 extending radially towards the outside, the periphery of which is folded square and thus forms a skirt cylindrical 30 able to slide axially in the bowl 5. Between the bottom of the bowl 5 and the plate 28 is arranged a helical metal spring 32, elastically compressible, a double stop system being provided on the skirt 30 and on the upper part of the side wall 5a intended to maintain the push button 26 in place in the bowl 5, this push button then being axially movable against the return force of the spring 32.

The tube 24 is closed at its upper end by a transverse face 34 oblique which has a concave shape and on which the user places his finger for dispensing product P. The upper end of the button pusher 26 further comprises a dispensing orifice 36 communicating with the chamber 22 by a distribution channel 38. The distribution orifice 36 is closed by an elastic distribution valve 40 capable of preventing air from enter the pumping chamber 22, but capable of opening under the push of product P coming from the pumping chamber.

The push button 26 provided with the distribution valve 40, and the hoop 4 provided of the piston 12 constitute a dispensing head 7.

To dispense a dose of product P, simply press axially on the face 34 of pusher 26 in the direction of arrow F (see FIG. 1) to make lower the tube 24 into the bowl 5 and thus reduce the volume of the pumping chamber 22, compressing the spring 32. During this volume reduction, a determined volume of air is pushed out of the chamber 22, through the dispensing orifice 36 by pushing back the valve elastic 40.

By releasing the force on the pusher, the return force of the spring brings this last in the initial position, which creates a depression in room 22. This depression is sufficient to take off the membrane 16 of the central pin 18 and to aspirate a dose of product P found in pocket 2.

When the chamber 22 is initially empty, it only takes a few presses successive on the pusher 26 to fill with product P the chamber 22 and the distribution channel 38. The aspirated product is then expelled to the outside by pushing back the distribution valve 40. When expelling the product, the overpressure prevailing inside the chamber 22 keeps the valve closed 16, 18, by pressing the membrane 16 on the pin 18.

Figures 4 and 5 show a second embodiment of the invention. The distributor 101 according to FIG. 4 differs from that shown in the Figure 1 by the absence of the pocket, and it includes an intake valve different construction. In FIG. 4, the parts identical to those of the Figure 1 have the same reference numbers, their description will not recovery only succinctly; different pieces but playing a role similar to those in figure 1 are marked with reference numbers of 100.

As seen in Figure 4, a product tank is delimited by a rigid external enclosure 8 of cylindrical section at the bottom of which is disposed a follower piston 102a. When dispensing product P, this piston 102a is able to move axially along the X axis in the direction of the button pusher 26 under the action of a depression created by the volume chamber variable 22. The cylindrical enclosure 8 has an attached bottom 108b provided a vent port 108a.

Analogously to the embodiment of FIG. 1, the dispenser 101 of FIG. 4 comprises a dispensing head 107 consisting of a hoop 4 covering the rigid enclosure 8, this hoop being shaped like a bowl 5.

The center of the bowl 5 is crossed by a product suction channel 11 and extended upwards by a central chimney 10, the top of which carries a piston 112. The piston 112 is provided with three slots 114a-114c discontinuous, arranged on a circular line, formed in a elastically deformable membrane 116 which has been deposited, by gluing, breakdown or by bi-injection of an appropriate elastomeric material on the upper end of the piston 112. The piston 112 has a shape general cylindrical, each end of the cylinder being provided with a lip circular sealing 112a and 112b (see Figure 5). Apart from the membrane 116, the piston 112 is made of a rigid or semi-rigid material such as low density polyethylene, ensuring, however, by a thickness relatively weak lips 112a and 112b, tight and smooth sliding in the cylindrical part 24 of the push button 26. Advantageously, other parts of the distributor 101, such as the push button 26, the hoop 4 and the rigid enclosure 8 are made of a rigid thermoplastic material such than polypropylene.

The central chimney 10 has an upper end provided with a annular edge 118 forming a seat, the diameter of which is chosen so that the edge 118 completely blocks the slots 114a-114c, in the undeformed position of the membrane.

The membrane 116 and the annular edge 118 form a valve intended to the admission of product P into the variable volume chamber 22. When a overpressure is present in the variable volume chamber 22, the product contained in the chamber 22 cannot descend into the reservoir 102, because the edges of the slots 114a-114c of the membrane are applied, tightly against seat 118. When, after dispensing a dose of product, a vacuum is created in chamber 22, the edges of the slots 114a-114c are detached from seat 118, and product P is sucked up.

Figure 6 shows an alternative embodiment of the piston of Figure 3. The piston 212 of FIG. 6 has two annular sealing lips 212a, 212b which are arranged on each end of the piston. The thickness of these lips is degressive so that the extreme area intended to come to the contact with the internal wall of the chamber, has only a thickness of a few hundredths of a millimeter. On the upper part of the piston is disposed, by bi-injection or by over-molding, a membrane 216 in elastomer provided with a central opening 214. In the membrane are made several radial slots 214a extending from the opening 214 up to the proximity of the periphery of the membrane. Compared to the embodiment of Figure 3, the piston of Figure 6 is designed for a more important product and more flexible operation.

Furthermore, the pumping system must occupy only a small volume, to allow its integration into a distributor. Thus, according to the invention, a pump is advantageously used comprising a piston whose diameter is between 4 mm and 15 mm, and preferably between 5 mm and 10 mm approximately. This allows the realization of a shape distributor particularly compact, low height. With this in mind, it is possible, in particular, to realize the dimension distribution head particularly reduced. According to another aspect of the invention, it is possible to make distributors at a particularly advantageous cost price.

Claims (21)

  1. Dispensing head (7, 107) for dispensing a product (P) of liquid to pasty consistency contained in a reservoir (2, 102), comprising a pushbutton (26) which can be moved axially, the said pushbutton having a body, the internal walls of which define a variable volume pumping chamber (22), having an inlet for the product, closed off by an intake valve (16, 116, 216) borne by a piston (12, 112, 212), the piston having at least one sealing lip (12a, 12b; 112a, 112b; 212a, 212b) in contact with which the internal walls move between a high axial position and a low axial position, passage from the low axial position to the high axial position causing suction of product (P) in the pumping chamber (22) via the intake valve, and passage from the high position to the low position causing the outputting of the product sucked through a dispensing valve (40) closing off an outlet orifice (36) of the said chamber (22), elastic return means (32) being provided to return the pushbutton (26) to the high position, the intake valve (16, 116, 216) and the piston (12, 112, 212) being mounted on a band (4) surmounting the said reservoir (2, 102), the said band comprising a seat (18, 118) for the intake valve (16, 116, 216) so as to prevent any return of product (P) to the reservoir (2, 102), the piston comprising a central part (16, 116, 216) made in the form of a membrane made of an elastically deformable material and in which at least one opening (14, 114, 214) is made so as to form the said intake valve, characterized in that the piston (12, 112, 212) is formed from an annular part made from a rigid or semi-rigid material different from the material of the central part (16, 116, 216), the central part (16, 116, 216) forming a single piece with the annular part.
  2. Dispensing head according to Claim 1, characterized in that the said annular part (12, 112, 212) provides the mounting for the piston on a supply channel (11) bearing the said seat (18, 118), the said annular part being positioned outside the said supply channel.
  3. Dispensing head according to either of Claims 1 and 2, characterized in that the membrane (16, 116, 216) is mounted on the seat (18, 118) so as to close the opening (14, 114, 214) in a sealed manner, at least when there is an overpressure inside the chamber.
  4. Dispensing head according to Claim 3, characterized in that the membrane (16, 116, 216) is mounted on the seat (18, 118) so as to close the opening (14, 114, 214) in a sealed manner in the absence of a vacuum inside the chamber.
  5. Dispensing head according to any one of the preceding claims, characterized in that the annular part (12, 112, 212) of the piston comprises a portion (12c) forming a stop, so as to ensure the accurate positioning of the central part of the piston on the seat.
  6. Dispensing head according to any one of the preceding claims, characterized in that the intake valve (16, 116, 216) and the annular part (12a, 12b; 112a, 112b; 212a, 212b) are produced by twin-shot injection moulding or overmoulding of two compatible or incompatible materials.
  7. Dispensing head according to any one of the preceding claims, characterized in that the annular part (12a, 12b; 112a, 112b; 212a, 212b) has a graduated thickness in the direction of its free end.
  8. Dispensing head according to any one of the preceding claims, characterized in that the intake valve (16, 116, 216) consists of a membrane, the said membrane having a variable thickness.
  9. Dispensing head according to any one of the preceding claims, characterized in that the elastically deformable material is an elastomeric material.
  10. Dispensing head according to any one of the preceding claims, characterized in that the said elastically deformable material is chosen from the elastomers comprising: propylene/ethylene copolymers; polyether block amides; polyvinyls; ethylene-propylene-diene terpolymers (EPDM); styrene-butadiene block polymers (SBS); styrene-ethylene-butadiene block polymers (SEBS-SIS); thermoplastic polyurethanes; blends of polypropylene with one of the following elastomers: styrene-ethylene-butadiene block polymers (SEBS-SIS); ethylene-propylene-diene terpolymers (EPDM); styrene-butadiene block polymers (SBS); elastomers of silicone, butyl or nitrile rubbers, latexes or fluorinated elastomers.
  11. Dispensing head according to any one of the preceding claims, characterized in that the elastically deformable material has a Shore A hardness between 15 and 90.
  12. Dispensing head according to any one of the preceding claims, characterized in that the rigid or semi-rigid material is chosen from high- and low-density polyethylenes polypropylenes, polyvinyl chlorides, polyacetals and ethylene vinyl acetates.
  13. Dispensing head according to any one of Claims 8 to 12, characterized in that the membrane (16, 216) is pierced at its centre with an orifice (14, 214) with a cross section less than the cross section of the said seat (18, 118), the said seat being centred at the apex of a supply channel (11) formed by the said band (4).
  14. Dispensing head according to Claim 13, characterized in that a region of the membrane (216) surrounding the orifice (214) comprises a plurality of radial slots (214a).
  15. Dispensing head according to any one of Claims 8 to 12, characterized in that the membrane (116) has a plurality of concentric slots (114a-114c), the said seat consisting of an annular part at the apex of a supply channel (11) formed by the said band (4).
  16. Dispenser (1, 101) for product (P) of liquid to pasty consistency equipped with a dispensing head (7, 107) according to any one of the preceding claims.
  17. Dispenser according to Claim 16, characterized in that the band (4) comprises a supply channel (11), centred on the longitudinal axis (X) of the dispenser, and opening out onto the intake valve (16, 116, 216) of the dispensing head (7, 107), the said supply channel being surrounded by an annular portion forming a cavity (5) all around the supply channel (11), the said cavity being delimited, away from the supply channel, by an outer annular skirt (6) bearing catching means (6a) on the dispenser.
  18. Dispenser according to Claim 17, characterized in that the said cavity (5) has a transverse wall (5b) between the supply channel (11) and the outer annular skirt (6), the said elastic return means (32) being positioned between a shoulder (28) formed by the pushbutton (26) and the said transverse wall.
  19. Dispenser (1) according to Claim 17 or 18, characterized in that the reservoir (2) consists of a flexible pouch having an open end (2a) secured to the band (4) and in communication with the said supply channel (11), the catching means (6a) cooperating with one end edge (6b) of a rigid or semi-rigid outer vessel (8) containing the said pouch.
  20. Dispenser (101) according to Claim 17 or 18, characterized in that the reservoir (102) consists of a rigid or semi-rigid vessel (8) in communication with the supply channel (11), the catching means cooperating with an end edge of the said rigid or semi-rigid outer vessel, a follower piston (102a) being placed in the bottom of the reservoir.
  21. Dispenser according to any one of Claims 16 to 20, characterized in that the product (P) is a cream, a gel or a liquid foundation.
EP98401483A 1997-07-02 1998-06-17 Dispenser for liquid or pasty material comprising pumping means Expired - Lifetime EP0888823B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9708468 1997-07-02
FR9708468A FR2765560B1 (en) 1997-07-02 1997-07-02 Dispenser for a liquid or pasty product comprising improved pumping means

Publications (2)

Publication Number Publication Date
EP0888823A1 EP0888823A1 (en) 1999-01-07
EP0888823B1 true EP0888823B1 (en) 2002-11-06

Family

ID=9508850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98401483A Expired - Lifetime EP0888823B1 (en) 1997-07-02 1998-06-17 Dispenser for liquid or pasty material comprising pumping means

Country Status (9)

Country Link
US (1) US6070763A (en)
EP (1) EP0888823B1 (en)
JP (1) JP3392755B2 (en)
CN (1) CN1081589C (en)
AR (1) AR015922A1 (en)
CA (1) CA2241341C (en)
DE (1) DE69809135T2 (en)
ES (1) ES2186982T3 (en)
FR (1) FR2765560B1 (en)

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Also Published As

Publication number Publication date
CA2241341C (en) 2003-11-04
CA2241341A1 (en) 1999-01-02
DE69809135T2 (en) 2003-03-20
CN1208711A (en) 1999-02-24
FR2765560B1 (en) 1999-08-13
JPH1176883A (en) 1999-03-23
EP0888823A1 (en) 1999-01-07
ES2186982T3 (en) 2003-05-16
AR015922A1 (en) 2001-05-30
US6070763A (en) 2000-06-06
CN1081589C (en) 2002-03-27
FR2765560A1 (en) 1999-01-08
JP3392755B2 (en) 2003-03-31
DE69809135D1 (en) 2002-12-12

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