Patent Application
20230365319
The subject matter of the present invention is a pushbutton dispenser for pasty products, in particular for toothpastes.
Such dispensers have been known for some time, and the Applicant itself holds the patent family coming under document U.S. Pat. No. 4,821,926. Such dispensers have been and continue to be widely known for certain advantages that set them apart from normal toothpaste tubes, such as, for example, ease of use, the ability to dispense practically all of the toothpaste without any remaining, and other advantages.
There are essentially two types of these dispensers on the market.
A first type, used especially for high-viscosity pastes, provides a metal stop ring on the bottom of the tube which, when the pushbutton is released (suction phase), advances together with the piston toward the top of the tube and prevents the piston from recoiling toward the bottom of the tube when the pushbutton is pressed (dispensing phase). An embodiment example is described in document US4154371.
A second type, used especially for medium- or low-viscosity pastes, instead comprises parts having lips or diaphragms that work as check valves, and therefore the piston does not have to cooperate with a stop ring. An embodiment example is described in document U.S. Pat. No. 4,402,431.
This latter type is quickly becoming widespread because it is possible to make all the components out of plastic materials belonging to the same family. As such, these dispensers are easily recyclable and meet current environmental protection requirements. However, these dispensers have numerous complex components, making the industrial costs of design, manufacture, and assembly rather high.
The object of the present invention is to provide a dispenser for pasty products, particularly toothpastes, that meets the requirements of the sector, particularly concerning the use of plastic materials belonging to the same family, and overcomes the drawbacks mentioned in reference to the prior art.
This object is achieved by a pump head for a dispenser for pasty products according to claim 1, and by a dispenser according to claim 7. The dependent claims describe additional advantageous embodiments.
The features and advantages of the dispenser according to this invention will become apparent from the following description, given as a non-limiting example in accordance with the figures in the accompanying drawings, wherein:
In reference to the figures in the appended drawings, the number 1 refers to a dispenser for pasty products, particularly toothpastes, as a whole according to an embodiment of the present invention.
The dispenser 1 comprises a container tube 2, preferably made as a single part from plastic material, for example a polymer material belonging to the polyolefin group, such as polypropylene (PP).
The container tube 2 comprises an annular tube wall 4, typically circular and cylindrical, having a central axis X. The tube wall 4 delimits a periphery of a tube compartment 6 intended to contain the pasty product. The tube wall 4 goes from a lower end 8, which is itself open and through which the tube wall 4 is filled with the pasty product, to an upper end 10 to which a dispensing head 50, to be discussed later, is applied.
The dispenser 1 further comprises a piston 12 received into the tube compartment 6 by an interference fit, designed to slide axially from the lower end 8, where it is located when the tube compartment 6 is full of product, to the upper end 10 as the product is dispensed.
Preferably, the piston 12 is made of a plastic material, preferably a polymer material belonging to the polyolefin group, for example high-density polyethylene (HDPE).
The dispenser 1 further comprises a main chamber 20 placed at the upper end 10 of the container tube 2 for containing product that is about to be dispensed.
According to a preferred embodiment, the main chamber 20 is delimited annularly by an end section 22 of the tube wall 4, at the bottom by a separating wall 24 occupying the tube compartment 6 diametrically, and at the top by a cap 26 of a pump 28. The separating wall 24 is provided with a plurality of windows 29 passing through the thickness, through which the tube compartment 6 may communicate with the main chamber 20.
Preferably, the separating wall 24 is made as a single piece together with the container tube 2.
In addition, the separating wall 24 preferably comprises an annular outer portion 30, preferably coaxial with the tube wall 4, radially proximal to the end section 22 of the tube wall 4, with which it forms an annular seat 32 for the pump 28.
In addition, the separating wall 24 preferably comprises a functional portion 34 placed radially inside the outer portion 30, through which said windows 29 are made.
Preferably, the functional portion 34 has the shape of a truncated cone, for example coaxial with the tube wall 4, diverging toward the main chamber 20.
Advantageously, the angle of the functional portion 34, as well as the width of the windows 29 facilitate the movement of the product from the tube compartment 6 to the main chamber 20 during a suction phase, to be discussed below.
In addition, the separating wall 24 preferably comprises a central flat surface 36 connected to the functional portion 34; the shape of the separating wall 24 preferably follows the shape of the piston 12 so as to allow an at least partial shape coupling when the product contained in the tube compartment has been used up, so that any residual product is kept to a minimum.
The dispenser 1 further comprises a fixed head 40 placeable on the container tube 2 at the upper end 10. For example, the head 40 is snapped into the end section 22 of the tube wall 4.
The head 40 comprises a dispensing tube 42 for connecting the main chamber 20 to the outside environment for dispensing the product.
Preferably, the dispensing tube 42 comprises an initial section 44 that opens directly into the main chamber 20, and an end section 46 connected to the initial section 44 and ending with an opening 50 for dispensing the product.
Preferably, the initial section 44 is coaxial with the tube wall 4 and therefore lies along said central axis X; the end section 46, however, is preferably at an angle and therefore lies along a dispensing axis Y that is inclined with respect to the central axis X.
The initial section 44 consists of an annular wall having an initial lateral surface 44a on the inside; the end section 46 consists of an annular wall having a lateral end surface 46a on the inside. The initial surface 44a and the end surface 46a together form a lateral surface 42a of the dispensing tube 42.
Once the head 40 is placed on the container tube 2, a space 43 is delimited between said head 40 and the separating wall 24 in which is placed the pump 28, which is applied to and cooperates with the separating wall 24 and the dispensing tube 42.
The pump 28, consisting of a hollow shell, is made as a single part from plastic material, for example a polymer material belonging to the polyolefin group, such as low-density polyethylene (LDPE).
Preferably, the pump 28 comprises an annular connection portion 52 consisting, for example, of a preferably continuous circular and cylindrical wall, designed to be housed by interference fit in the seat 32 formed by the tube wall 4 and the separating wall 24.
The pump 28 further comprises a dome-shaped elastically deformable cap 54 diverging toward the connection portion 52. Said cap 54 is designed to be deformed with respect to a rest condition in order to reduce the volume of the main chamber 20 and cause the product to be dispensed. Preferably, the cap 54 is connected to the connection portion 52 at a lower end.
The pump 28 further comprises, at the end opposite the end of the connection portion 52, a pump neck 55 connected to the cap 54 and protruding axially therefrom. The pump neck 55 is slidably inserted into the initial section 44 of the dispensing tube 42.
For example, the pump neck 55 consists of a tubular column portion 56 extending along a pump axis Z, preferably coaxial with the central axis X, and a tubular guide portion 58 connected to the column portion 56, contained radially and preferably also axially therein. In other words, the guide portion 58 forms a flap with respect to the column portion 56, thus making therewith an annular upside-down-U section. Again, in other words, an inside lateral surface 56i of the column portion 56 faces an inside lateral surface 58i of the guide portion 58.
Preferably, the pump 28 further comprises a bottom 60 supported by the pump neck 55 and in particular by the guide portion 58; the bottom 60 is provided with a plurality of bottom openings 62 arranged circumferentially.
Once the pump 28 and the head 40 are placed on the container tube 2, the initial section 44 of the dispensing tube 42 is inside the guide portion 58 and, in an initial rest condition, the appropriately shaped free end 44b of said initial section 44 closes said bottom openings 62 of the bottom 60. In other words, the free end 44b and the bottom 60 provided with bottom openings 62 form an intermediate or shutoff valve 64, the operation of which will be described below.
Preferably, the pump 28 further comprises an annular lip 66, protruding axially from the bottom 60, outside of the main chamber 20. For example, the lip 66 comprises a substantially cylindrical lip base 68 connected to the bottom 60 and a flared sealing portion 70, preferably chalice-shaped, connected to the lip base 68.
Once the pump 28 and the head 40 are placed on the container tube 2, the initial section 44 of the dispensing tube 42 is inside the guide portion 58, whereas the sealing portion 70 of the lip 66 is inserted into the initial section 44. In particular, the sealing portion 70 is in contact with the initial surface 44a of the initial section 44, forming a seal. The lip 66, and in particular the sealing portion 70 thereof, and the dispensing tube 42, and in particular the initial section 44 thereof, form an upper or delivery valve 72, the operation of which will be described below.
In addition, the pump 28 comprises a plurality of flexible flaps 74 protruding internally, for example from the inside lateral surface 54i of the cap 54 or from the connection area between the cap 54 and the connection portion 52. Each flap 74 has an inner flap surface 74i facing the inside lateral surface 54i of the cap 54 or the inside lateral surface 52i of the connection portion 52, and an opposite outer flap surface 74e facing toward the main chamber 20.
Each flap 74 is spaced circumferentially and is independent and free to move with respect to the others.
Each flap 74 is capable of closing a corresponding window 29 of the separating wall 24 during a dispensing phase of the dispenser's operation. The flaps 74 and the corresponding windows 29 thus form a lower or suction valve 76, the operation of which will be described below.
According to one embodiment, in a disassembled configuration of the dispenser 1, in which the pump 28 is uncoupled from the container tube 2, preferably uncoupled from the separating wall 24, the flaps 74 lie substantially parallel to the pump axis Z.
In addition, when the pump 28 is connected to the container tube 2, the flaps 74 engage with the functional portion 34 and are deformed in a controlled way, preferably elastically. In particular, due to the effect of assembly deformation, the flaps 74 are brought into contact with the functional portion 34 in such a way as to close off the windows 29 in a non-deformed or rest configuration of the pump 28.
According to one embodiment, with the pump 28 coupled to the container tube 2 and in the non-deformed configuration in which each flap 74 is engaged with a corresponding window 29, each flap 74 converges toward the central axis X.
In other words, with the pump 28 coupled to the container tube 2, the flaps 74 are incident to the central axis X in a non-orthogonal way, for example forming an angle substantially less than ninety degrees to the connection portion 52, as shown in
The dispenser 1 further comprises an actuator 80, for example in the form of a button, held so as to be movable such as by rotation or translation from the head 40, and designed to influence the pump 28 so as to cause deformation of the cap 26 and dispensing of the product. For example, the actuator 80 comprises an influence portion 82 in contact with the connection area between the column portion 56 and the guide portion 58, such that the squeezing thereof causes deformation of the cap 26.
Preferably, the actuator 80 also comprises a closing portion 84 for closing the opening 50 of the dispensing tube in a rest configuration of the dispenser.
The actuator 80 is made as a single part from plastic material, for example a polymer material chosen from the polyolefin group, such as polypropylene (PP).
Lastly, the dispenser 1 comprises a cap 100 that can be placed on the head 40 to cover the actuator 80 and prevent accidental or undesirable actuation.
The cap 100 is made as a single part from plastic material, for example a polymer material chosen from the polyolefin group, such as polypropylene (PP).
In an initial or rest configuration (
A dispensing phase (
When the actuator 80 is actuated, the closing portion 84 is disengaged at least partially from the opening 50, leaving it free to dispense the product.
During the dispensing phase, the volume of the main chamber 20 is reduced and the overpressure caused by the squeezed product keeps the suction valve 76 in the closed configuration. In other words, the flaps 74 are pushed against the edges of the corresponding windows 29 and close them. This prevents the product contained in the main chamber 20 from returning to the tube compartment 6 of the tube 2.
At the same time, due to the thrust of the actuator 80, the column portion 56 lowers, preferably guided in this movement by the guide portion 58, which slides as it is guided in contact with the dispensing tube 42 and in particular with the initial section 44 thereof.
The lowering of the column portion 56 causes the bottom 60 to lower and disengage from the initial section 44 of the dispensing tube 42; in particular, the lower end of the initial section 44 comes out through the bottom openings 62. The shutoff valve 64 thus changes to the open configuration and the product contained in the main chamber 20 comes through the bottom openings 62 of the bottom 60.
At the same time, due to the action of the product which is now located between the bottom 60 and the initial section 44 of the dispensing tube 42, the lip 68 is deformed elastically and moves away from the initial surface 44a of the initial section 44. The delivery valve 72 thus changes to the open configuration and the product may flow around the lip 68 through the initial section 44 to enter the end section 46 and come out through the opening 50 of the dispensing tube 42. Deformation of the lip 68 provides an easy passageway for the product to flow, even if very viscous.
When the actuator 80 reaches the end of travel, the dispensing phase ends and, after the actuator 80 is released, a suction phase occurs (
In particular, when the actuator 80 is released, the pump 28 tends to return to the non-deformed condition and influences the actuator in that direction, which tends to return to the initial condition. Consequently, the volume of the main chamber 20 tends to increase and the resulting partial vacuum causes the flaps 74 to bend, disengaging from the corresponding windows 29. In particular, each flap 74 is free to engage with or block a corresponding window 29 independently of the other flaps 74.
A predefined quantity of product contained in the tube compartment 6 is thus drawn into the main chamber 20.
At the same time, the lip 66 comes into contact again with the initial surface 44a of the initial section 44 so that the delivery valve 72 returns to the closed configuration. This ensures that the product in the dispensing tube 42 between the delivery valve 72 and the opening 50 does not return to the main chamber 20, nullifying the suction of new product from the tube compartment 6.
At the same time, the closing portion 84 of the actuator 80 tends to return to the initial condition in which the opening 50 is blocked, thereby cutting off the flow of dispensed product and facilitating separation of the dispensed quantity.
Once the cap 56 has returned to the non-deformed condition, the bottom 60 also returns to the initial position in which it engages with the initial section 44; the shutoff valve 64 thus returns to the closed configuration and, since the overpressure in the main chamber has ceased, the suction valve 72 also returns to the closed configuration.
According to an embodiment variant of the invention, the separating wall is a part made separately from the tube 4 and subsequently applied thereto.
Innovatively, the dispenser according to the present invention overcomes the drawbacks mentioned in reference to the prior art, as it is capable of dispensing pasty products, including very viscous ones, which need large passageways so as not to generate resistance to actuation, without resorting to metal parts and by means of a generally simple and low-cost structure in which the pump incorporates multiple functions.
Advantageously, the presence of independent flaps that are free to move independently of each other allows for effective deformation of each flap, optimizing the flow of product through the windows in the container tube.
Advantageously, the flaps are effectively deformed even in the presence of uneven pressure variations in the main chamber. Indeed, in such instances the flaps are subjected to differing pressures, since the paste is viscous; however, since the flaps are independent, the ones subjected to greater pressure do not keep closed the other flaps subjected to pressures suitable for causing the deformation thereof. This phenomenon is particularly evident with a pump having a single continuous flap.
Advantageously, bottlenecking phenomena in the product passageway are avoided, a very important problem with viscous pastes such as toothpastes.
Advantageously, minor allowable misalignments of the pump causing variable pressures on the viscous paste in the main chamber do not hinder the operation of the flaps.
Advantageously, the flaps are designed to deform in a controlled way when engaging with the separating wall, going from a substantially parallel orientation to one incident with the pump axis during the assembly phase.
Advantageously, the flaps are optimized to eliminate the problem of undercuts during stamping processes.
Advantageously, undesired deformations of the flaps, which could cause improper positioning in relation to the tube and result in malfunctioning of the flaps, are minimized during the stamping processes.
It is clear that a person skilled in the art, in order to satisfy current needs, could make modifications to the dispenser described above, said modifications all being contained within the scope of protection as defined in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102020000025594 | Oct 2020 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2021/059910 | 10/27/2021 | WO |
