DROP DISPENSER, LIQUID DISPENSER AND METHOD FOR MANUFACTURING A LIQUID DISPENSER

Description

[0001] The invention relates to a liquid dispenser for dispensing a liquid, in particular a pharmaceutical or cosmetic liquid. The invention relates in particular to a liquid dispenser designed as a dropper.

[0002] The liquid dispensers that are the subject of the invention are characterized in that the liquid to be dispensed is not already ready for dispensing in the dispenser's delivery state, but rather requires a mixing process of at least two source media. A liquid dispenser of this type therefore has at least two separate media chambers that are connected to each other before dispensing, so that the at least two source media can mix together and thereby form a blended liquid that can then be dispensed.

[0003] Document DE 8423325 U1 discloses a device for the safe dilution and application of plant protection products. It consists of a container with a hand pump and a special cap containing a concentrate. When the cap is screwed on, a predetermined breaking point separates the container, causing the concentrate to fall into the diluent and mix without the user coming into contact with it.

[0004] Document EP 0217425 A1 describes a cap with a reservoir and dropper for bottles, which mixes powder and liquid to prepare pharmaceutical solutions. The cap has a removable strip and a plunger which, when screwed down, cuts through the bottom of the reservoir. This causes the powder to fall into the liquid and form the solution.

[0005] Document WO 2009 / 020340 A1 describes a bottle closure with a structure for providing additives. The closure consists of an additive unit held in the bottle neck by an upper flange, an opening and closing unit that sits coaxially with the additive unit and moves up and down to open or close the opening, and an outer cap unit with a sealing tube that is positioned between the opening and closing unit and the additive unit and performs a sealing function.

[0006] The object of the invention is to provide a liquid dispenser that ensures a particularly high homogeneity of the mixed liquid and is easy and intuitive to use.

[0007] According to the invention, a liquid dispenser for dispensing cosmetic or pharmaceutical liquids is proposed. In particular, this liquid dispenser is preferably designed as a dropper.

[0008] The liquid dispenser according to the invention has a media reservoir for storing media prior to dispensing. The media reservoir comprises a first media chamber and a second media chamber, which are designed to hold different media, in particular two different liquids or a liquid and a medium in liquid-soluble form, especially a powder or granules. The media chambers are isolated from each other in their as-delivered state and can be connected to produce a mixed liquid. In addition to the direct introduction of powder or granules, another preferred configuration exists for storing a medium in the form of a solid. Here, the medium is formed by a fine porous solid structure that remains after moisture is removed from the previously introduced liquid containing the solid, thus pre-sealing the media chamber.

[0009] The liquid dispenser has a dispensing opening through which the mixed liquid can be discharged from the media reservoir. This dispensing opening can be designed for droplet dispensing. This dispensing opening is preferably associated with a discharge valve that opens even at a slight overpressure in the mixed liquid relative to the environment, particularly at an overpressure of no more than 2 bar, preferably at an overpressure of no more than 1 bar. Such opening at a slight overpressure is advantageous to enable droplet formation and prevent the risk of the mixed liquid being discharged as a jet. Furthermore, if the liquid dispenser is designed as a droplet dispenser, it has a droplet formation contour downstream of the dispensing opening so that the mixed liquid can collect there and subsequently detach from the droplet formation contour in the form of a droplet.In particular, the droplet formation contour can have a droplet formation surface surrounding the discharge opening, which is preferably limited on the outside by a tear-off edge.

[0010] However, other designs for a discharge opening are also possible in principle, for example those that release the mixed liquid in the form of an atomized spray mist or in the form of an unatomized jet.

[0011] Preferably, a pump device is provided for conveying the liquid from the media storage to the discharge opening in a liquid dispenser according to the invention, which has a pump chamber which is provided with an inlet valve on the inlet side and with an outlet valve on the outlet side.

[0012] In the case of a liquid dispenser designed as a dropper, the dispenser is equipped with a pump unit located between the media reservoir and the dispensing opening. This pump unit features a volumetrically variable pump chamber for dispensing pre-mixed liquid. The pump chamber has an inlet valve that opens when there is negative pressure within the chamber and an outlet valve that opens when there is positive pressure within the chamber. The pump unit is designed to dispense the pre-mixed liquid. After the first and second media chambers are connected, the media they contain mix to form the blended liquid. Typically, the user is expected to shake the dispenser after connecting the media chambers to ensure homogeneous mixing.It has been shown that the homogeneity of the liquid can be improved by subsequently pumping the already mixed liquid. In particular, if one of the media is in dry form before mixing, for example as a powder or granules, the pump increases homogeneity by pressurizing the mixed liquid. It is particularly advantageous if the pump chamber has the inlet and outlet on the same side, as this redirects the liquid flow, which contributes to achieving a high degree of homogeneity. The pump is preferably designed to pump only a relatively small quantity of liquid per pump actuation, preferably less than 100 µl, and particularly less than 50 µl.This reduces the risk of excessive force being used to pump so much liquid to the discharge opening that the desired droplet formation does not occur.

[0013] According to the invention, the media storage device comprises a main body that at least partially delimits the first media chamber. Furthermore, the media storage device has an inner body that is movable relative to the main body, at least partially delimits the second media chamber, and is arranged at least partially within the main body.

[0014] The inner body can be moved relative to the main body between an isolation position and a connection position. In the isolation position, a connecting channel between the media chambers is closed. This can be achieved by the inner body having a closure section, particularly at the end of the inner body located within the main body. In the isolation position, this closure section is positioned in an opening of the connecting channel and is pulled out of this opening by moving the inner body.

[0015] To achieve the connection position, the inner body is displaced relative to the main body by means of a media storage thread. Both the main body and the inner body are provided with threads for this purpose, whereby a thread, as defined in this invention, is a structure by means of which a rotational relative movement directly results in an axial relative movement.

[0016] The threaded connection of the media chambers makes the process of connecting them very simple for the user. They only need to rotate the inner body relative to the main body of the media storage unit. In particular, the main body can be integrally or rotationally fixed to the housing of the liquid storage unit, so that a relative rotation of the inner body relative to the housing establishes the connection.

[0017] Preferably, the liquid dispenser has a removable cap that protects the dispensing opening when in place. If this cap is designed as a screw cap and attached to the liquid dispenser housing by means of a cap thread, it is particularly advantageous if the cap thread and the media reservoir thread are designed as opposing threads. This allows the user, when connecting the media reservoir, to grasp the main body, the housing, or the screw cap on one side and the inner body on the other and twist them against each other, without the risk of accidentally unscrewing the screw cap instead of connecting the media reservoir, and potentially even going unnoticed that the connection has been made.

[0018] The inner body at least partially delimits the second media chamber. Preferably, it forms a wall surrounding the second media chamber. In particular, this wall is perforated at one end of the second media chamber, allowing fluid to flow towards the first media chamber after axial displacement of the inner body relative to the main body.

[0019] At a preferably opposite end, the inner body is preferably provided with an open end which can be closed by means of a closure element. The medium can therefore be filled into the second media chamber through this open end while the inner body is already in its insulating position relative to the main body. After filling, this open end is closed by means of the closure element, wherein, in particular, the closure element and the inner body are preferably designed to create a sealing snap connection.

[0020] The design of the media storage device preferably includes a main body with a sleeve-shaped wall, within which the second media chamber, bounded by the inner body, is arranged. Preferably, an outer surface of the inner body and an inner surface of the main body are aligned to form a seal, preventing any liquid from escaping into the environment.

[0021] The media storage thread can be arranged such that it is formed by an internal thread on the main body and an external thread on the inner body.

[0022] In contrast, a design is considered advantageous in which an external thread of the media storage thread is provided on the outside of the sleeve-shaped wall of the main body. Correspondingly, the inner body has a sleeve section arranged outside the sleeve-shaped wall of the main body, on the inside of which the internal thread of the media storage thread is provided.

[0023] In this design, the inner body therefore has two sleeve sections: an inner sleeve section that directly borders the second media chamber, and an outer sleeve section with an internal thread. The two sleeve sections are preferably formed in one piece and are particularly connected to each other at a distal end of the inner body.

[0024] The outer sleeve section preferably forms a gripping surface on its outside, allowing the user to grasp the inner body for twisting. This gripping surface is preferably provided with a non-circular shape and / or surface texture to prevent slippage during the twisting motion.

[0025] Preferably, a stop is provided that prevents the partial threads of the media storage thread from being completely separated from each other.

[0026] Furthermore, it is preferably provided that a locking device is associated with the media storage thread, which allows the inner body and the main body to be locked in a rotationally secure manner in the isolation position and / or in the connection position. This locking device preferably ensures, in particular, that the media chambers do not unintentionally return to the isolation position after the connection position has been established. Otherwise, there would be a risk that some of the mixed liquid could not be discharged because it is located in the isolated second media chamber.

[0027] In a simple design, the locking mechanism can be configured to generally allow a return to the isolation position, but this is made more difficult by a phased increase in torque. Alternatively, the locking mechanism can incorporate a return-to-isolation barrier that completely prevents non-destructive return-to-isolation mechanically.

[0028] Preventing the return flow is also advantageous because it makes it easy for the user to see whether the mixing process has already taken place in a liquid dispenser. If the inner body is in its connecting position, then the mixing has already occurred.

[0029] Alternatively or additionally, it is preferably provided that the media storage device has a tamper-evident section that is molded onto the inner body or the main body before the dispenser is put into operation, i.e., in particular, is an integral part of the inner body or main body. This tamper-evident section is then separated from the inner body or the main body when the media storage device is first moved into the connected position. The absence of the tamper-evident section, or its apparent separation from the inner body or main body, makes it immediately clear to the user that the connected position was at least temporarily established.

[0030] The main body of the media storage unit can be permanently connected to the one-piece or multi-piece housing of the liquid dispenser, on which the dispensing opening is also provided.

[0031] However, it can be advantageous if the main body is designed as a separate component which is intended for coupling to a housing component, wherein a corresponding coupling device is preferably designed to achieve a rotationally fixed connection and is in particular designed in the form of a snap coupling.

[0032] This design of the main body as a separate component allows it to be connected to the inner body separately from the liquid dispenser housing. The resulting insulated second media chamber can then be filled with the medium, and only then can this sub-unit be connected to the liquid dispenser housing. This offers the advantage that the medium in the second media chamber is already isolated before it comes into contact with the other medium. Unintentional mixing, for example, due to dripping of the medium at an unwanted point during the filling process, is thus reliably prevented.

[0033] The first media chamber is preferably formed jointly by the walls of the liquid dispenser housing and the main body. Preferably, however, the housing wall is already capable, when appropriately oriented, particularly with the discharge opening facing downwards, of receiving the medium, so that the aforementioned sub-unit consisting of the main body and inner body can then be attached to the housing, thereby isolating the first media chamber from the environment.

[0034] Regarding the filling of the media chambers of the liquid dispenser or the dropper, various options are available depending on the intended use. In particular, it may be possible for both media to be in liquid form.

[0035] However, applications are also possible and covered by the invention in which a liquid is stored in only one of the media chambers, while the other media chamber contains a powder or granules soluble in the liquid. When the media storage unit is brought into a state of fusion, the liquid dissolves the powder or granules, particularly with the aid of a shaking motion and preferably also with the aid of subsequent conveyance by a pumping device into the pressurized liquid.

[0036] The use of the dispenser with a liquid medium on the one hand and a powder or granules on the other is primarily determined by the intended application. However, filling one of the media chambers with a powder can generally be advantageous, as this prevents the discharge of liquid without prior mixing.

[0037] This is achieved when the powder or granules are stored in the first media chamber, which has a discharge channel leading to the discharge opening, in particular to a pump unit located upstream of the discharge opening. In this design, the liquid is stored in the second media chamber.

[0038] Therefore, no discharge can occur before the connection is established. If the pump is activated before the media are mixed, it cannot draw in any liquid due to the lack of liquid in the first media chamber. This immediately makes it clear to the user that incorrect operation has occurred and that they must first connect the media chambers. If, on the other hand, the liquid is in the first media chamber and the powder or granules are in the second, there is a risk that the user will only discharge the liquid and initially fail to notice the error of insufficient mixing. Even if they notice the error later, they can hardly correct it, since establishing the connection would result in a mixed liquid whose composition, due to some of the liquid already discharged from the first media chamber, would not correspond to the intended composition.

[0039] According to the invention, the media reservoir of the liquid dispenser or dropper is designed to increase in volume by connecting the first media chamber to the second media chamber, preferably by at least 1%, preferably by at least 3%. This can be achieved if, during the connection of the media chambers, not only is the partition between them opened, but also the outer walls defining the media chambers are further spaced apart. A design in which the inner body can be partially moved out of the main body by means of the media reservoir thread is particularly advantageous. This increases the overall length of the media reservoir and simultaneously increases its overall volume.

[0040] Increasing the volume can be particularly advantageous for better mixing of the media. For example, shaking to mix the media is more effective the more free space is available in the connected media storage device.

[0041] Preferably, the dropper or other liquid dispenser is a side-actuation dispenser. This means that the dispenser has an elongated housing extending in the direction of a main axis of extension, with an actuating push button for actuating the pumping device being designed as a laterally arranged actuating push button that can be pressed radially for the purpose of actuating the pumping device.

[0042] Several methods are proposed for assembling and filling a liquid dispenser according to the invention. According to a first method, the main body and the inner body are coupled together while the main body is not yet attached to the dispenser housing. The main body and the inner body thus form a separate unit from the dispenser housing, which then allows the filling of the second media chamber. Typically, after filling, the second media chamber is also insulated by attaching the closure element.

[0043] This assembly, comprising the main body and the inner body, is then coupled to the housing of the liquid dispenser, preferably after the first media chamber on the side of the housing has been filled.

[0044] An alternative method involves coupling the main body and the inner body while the main body is already fixed to the housing of the liquid dispenser, in particular by being coupled to it or being formed integrally with it. The first media chamber may have been filled before the main body is attached to the housing. However, the main body can also be coupled to the first media chamber while it is already filled, in order to minimize contamination from the medium. Once the inner body is attached to the main body, the second media chamber is formed and isolated from the first, allowing the second media chamber to be filled.

[0045] In both methods, the media chambers can be filled with a solid or a liquid, with at least one of the media chambers containing a liquid. A particularly preferred method for introducing a solid involves first filling the relevant media chamber with a liquid. Subsequently, the moisture is removed from this liquid in the still-open media chamber, particularly in an oven at a temperature between 60°C and 110°C. A solid remains in the media chamber, especially in the form of a fine porous structure. This structure is highly soluble in liquids, allowing for very rapid mixing when the liquid dispenser is put into operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Further advantages and aspects of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are explained below with reference to the figures. Fig. 1 The cutaway view shows a liquid dispenser according to the invention, which is designed as a dropper. Fig. 2 und 3 The individual components of a media storage device for the liquid dispenser are shown. Fig. 1 . Fig. 4A bis 4C illustrate the commissioning of the liquid storage tank of the Fig. 1 . Fig. 5A bis 5D illustrates a first variant of an assembly and filling process for the liquid storage tank of the Fig. 1 . Fig. 6A bis 6D illustrate a second variant of an assembly and filling process for the liquid storage tank of the Fig. 1 . Fig. 7A bis 7D illustrate a third variant of an assembly and filling process for the liquid storage tank of the Fig. 1 . DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0047] Fig. 1 Figure 1 shows a cross-sectional view of an embodiment of a liquid dispenser 10 according to the invention. This liquid dispenser 10 is designed as a droplet dispenser. Its dispensing opening 60 is therefore surrounded by a droplet-forming surface 62. For the purpose of dispensing liquid from the media reservoir 20, the liquid dispenser 10 has a pumping device 50, which can be actuated by means of an actuating push button 58 attached laterally to a housing 12 of the liquid dispenser 10. The pumping device 50 has a pumping chamber 52, the inlet 53 of which is provided with an inlet valve 54 and the outlet 55 of which is provided with an outlet valve 56. The inlet 53 is connected to the media reservoir 20. The outlet 55 is connected to the dispensing opening 60, with a dispensing valve 64, which opens even at low pressure, being located upstream of the dispensing opening 60.

[0048] When the dispenser is not in use, the dispensing opening 60 and the actuating push button 58 are covered by a protective cap, which in this case is designed as a screw cap 70.

[0049] The media storage unit 20 is formed by four components: the aforementioned housing 12 of the liquid dispenser 10, a main body 30 which is firmly connected to the housing 12, for example by snapping, an inner body 40 which is inserted into the main body 30 from a distal end and screwed on, and a sealing part 48 which is inserted into the inner body 40 in a sealing manner.

[0050] These components together form two in the delivered state of the Fig. 1 Separate media chambers 22, 24. The first media chamber 22 is primarily bounded by the housing 12 and the main body 30. With regard to the orientation of the Fig. 1 At the lower end of the first media chamber 22, it is bounded by an end section 45B of the inner body 40. The second media chamber 24 is primarily bounded by an inner sleeve section 45 of the inner body 40, in which a plurality of openings 45A are provided. In the delivered state of the Fig. 1 Two sealing surfaces 31, 41 of the main body 30 and the inner body 40 are in contact with each other, so that medium from the media chamber 24 can pass through the openings 45A, but cannot initially flow past the sealing point formed by the sealing surfaces 31, 41.

[0051] The inner body 40 has, in addition to the inner sleeve section 45, which primarily delimits the second media chamber, an outer sleeve section 44, which is located outside the circumferential wall 34 of the main body 30. This outer sleeve section 44 terminates at its Fig. 1 The upper end is formed by a single-piece, ring-shaped tamper-evident section, which, in the delivered state, is connected to the inner body 40 by means of plastic bridges (not shown). The outer surface of the outer sleeve section 44 forms a gripping surface.

[0052] Based on the Fig. 2 und 3 The main body 30, the inner body 40 and the closure part 48 are explained in detail.

[0053] The main body 30 has a circumferential wall 34, as already described, on the outside of which the external thread 32 is provided. On the inside, the main body 30 has a locking device 36 in the form of a vertical locking rib. Inside the main body 30, a circumferential sealing rib is provided, the inner end surface of which forms the sealing surface 31.

[0054] The inner body 40 exhibits in particular in Fig. 3 The aforementioned sleeve sections 44 and 45 are evidently present. The inner sleeve section 45 transitions into the end section 45B, with recesses forming the aforementioned openings 45A. Locking arms are provided on the outside of the inner sleeve section 45, forming a locking device 46. The internal thread 42 is provided on the inside of the outer sleeve section. Furthermore, the previously described annular tamper-evident section 47 is attached to the free end of the sleeve section 44.

[0055] Based on the Fig. 4A bis 4C The procedure for putting the dispenser into operation will be explained.

[0056] Fig. 4A Figure 1 shows the dispenser 10 in its delivered state. In this state, the media chambers 22 and 24 are separated from each other by the abutting sealing surfaces 31 and 41. The inner body 40 is screwed onto the main body 30 by means of the threads 32 and 42 until it reaches its final position.

[0057] The first media chamber 22 contains a first medium in the form of granules or powder. The second media chamber contains a liquid medium.

[0058] To operate the dispenser, it is grasped with two hands, one hand gripping the screw cap 70 and / or the housing 12, while the other hand grips the handle on the outside of the outer sleeve section 44 of the inner body 40. When the screw cap 70 or the housing 12 is twisted against each other, and the inner body 40 is twisted against each other, as indicated by arrows 2A and 4B, the sealing point opens and the media chambers 22 and 24 are connected. There is no risk of accidentally unscrewing the screw cap 70 during this process, as the threads of the screw cap 70 and the media storage threads 32 and 42 are opposite to each other. Therefore, twisting the screw cap 70 in the direction of arrow 4B corresponds to an unscrewing motion, not an unscrewing motion.

[0059] In the state of Fig. 4b One of the locking arms of the locking device 46 engages with the locking bar of the locking device 36 by being irreversibly pulled over this locking bar under elastic deformation. This prevents the inner body 40 from rotating backwards relative to the main body 30. The second locking arm serves to prevent the inner body 40 from being completely unscrewed.

[0060] As in Fig. 4B As can be seen, the screw movement of the inner body 40 relative to the main body 30 separates the annular originality section 47 from the rest of the inner body 40, so that, in addition to the irreversible axial relative position of the inner body 40 relative to the main body 30, it is also evident from the separated originality section 47 that the connection of the media chambers 22, 24 has already taken place. The liquid medium from the media chamber 24 is in the state of Fig. 4B The liquid has already flowed into the first media chamber 22 and mixed with the powder there. It is usually recommended that the dispenser be shaken as a whole to ensure better mixing. If necessary, the user may also be asked to wait a short time until the media are sufficiently mixed.

[0061] The dispenser is then ready for operation as soon as the screw cap 70 has been unscrewed by a counter-rotating screwing motion, as illustrated by arrows 2B and 4A. Here too, a ring-shaped originality section 72 remains on the housing 12.

[0062] The dispenser can now be activated by pressing the actuating button 58, so that liquid is pumped to the dispensing opening 60 and forms a droplet on the droplet-forming surface 62. The pumping device 50 has its inlet 53 and its outlet on the same side, so that the mixed liquid is deflected several times during pumping. This promotes the homogeneity of the mixed liquid.

[0063] Even if, during commissioning, the media storage unit 20 is mistakenly not connected beforehand, and instead the screw cap 70 is unscrewed directly by applying torque in the wrong direction, there is no risk of incorrect discharge. The pump unit 50 is unable, or only partially able, to draw in the unmixed powder in the insulated media chamber 22.

[0064] The Fig. 5A bis 5D , 6A bis 6D as well as 7A bis 7D Three different methods for filling the dispenser during manufacturing are shown.

[0065] In the process of Fig. 5A bis 5D Starting from an inner body 40, which is already sealed in the main body 30, the second media chamber 24 is first filled and preferably then closed with the closure part 48.

[0066] After the first media chamber 22 or the part of the first media chamber belonging to the housing has been filled, the assembly consisting of main body 30, inner body 40 and preferably the closure part 48 is then connected to the housing 12 by inserting the main body into it and locking it in place, preferably in a rotationally secured manner.

[0067] With this procedure, contact between the media during manufacturing is easily avoided. The filling of the assembly, consisting of the main body 30, inner body 40, and closure part 48, can take place at a separate location. A second, already insulated media chamber 24 is added to the assembly with the housing 12.

[0068] In the process of Fig. 6A bis 6D The first media chamber 22 is filled first, during which time the main body 30 may already be coupled to the housing 12, but this is not mandatory. For this process, the main body can also be formed integrally with the housing 12.

[0069] After the first media chamber 22 is filled, the inner body 40 is placed onto the already attached main body 30, thus isolating the first media chamber 22 from its surroundings and the second media chamber 24. The second media chamber 24 is then filled and closed using the closure part 48.

[0070] In the process of Fig. 7A bis 7D will be similar to the procedure of Fig. 5A bis 5D Starting from an inner body 40, which is already sealed inside the main body 30, the second media chamber 24 is filled first. The filling takes place in the Fig. 7A as shown, with a liquid. Before the media chamber is closed with the closure part 48, the moisture is removed from the liquid, in particular by heating the sub-unit consisting of the main body 30 and inner body 40 in an oven at over 60°C for several hours. The liquid remaining is described in Fig. 7B The porous solid structure shown is present. Only after the moisture has been removed is the closure part 48 attached and the media chamber 24 thus isolated.

[0071] In this process, a liquid is poured into the first media chamber 22. The sub-unit, consisting of the main body 30 and the inner body 40, is then inserted into the housing.

[0072] Although the procedure of Fig. 7A bis 7D A media storage unit 20 with two media chambers 22 and 24 that can be coupled by a thread can, according to a particular design according to the invention, also be provided that filling with liquid that evaporates before closing is also provided for liquid dispensers with pump devices, in particular for drop dispensers whose media chambers 22 and 24 can be coupled to each other in another way, for example by removing a closure part from a connecting channel between the media chambers.

Claims

1. Liquid dispenser (10) for dispensing cosmetic or pharmaceutical liquids, having the following features: a. the liquid dispenser (10) has a media reservoir (20) for storage of media prior to discharge, and b. the liquid dispenser (10) has a discharge opening (60) through which liquid can be discharged from the media reservoir (20), and c. the media reservoir (20) has a first media chamber (22) and a second media chamber (24) which are isolated from one another for separate storage of two media and which are connectable to one another for producing a mixed liquid, and d. the media reservoir (20) has a main body (30) which delimits the first media chamber (22), and e. the media reservoir has an inner body (40) which is displaceable in relation to the main body (30) and which delimits the second media chamber (24), and f. the inner body (40) is displaceable in relation to the main body (30) between an isolation position and a connection position, wherein, in the isolation position, a connecting channel (26) between the media chambers (22, 24) is closed, and wherein, in the connection position, the connecting channel (26) between the media chambers (22, 24) is open, and g. the inner body (40), for transfer from the isolation position into the connection position, is displaceable in relation to the main body (30) by means of a media-reservoir thread (32, 42), characterized by the following further feature: h. the media reservoir (20) is configured for being enlarged in terms of its overall volume by the connection of the first media chamber (22) to the second media chamber (24).

2. Liquid dispenser (10) according to Claim 1, having the following further features: a. the liquid dispenser has a removable screw cap (70) by means of which the discharge opening (60) is protected in the fitted state, and b. the screw cap (70) is fastened to a housing (12) of the liquid dispenser (10) by means of a cap thread, and c. the cap thread and the media-reservoir thread (32, 42) are in the form of opposing threads.

3. Liquid dispenser (10) according to Claim 1 or 2, having the following further feature: a. the inner body (40) has an open end which is able to be closed off by means of a closure part (48), preferably having the following additional feature: b. the closure part (48) and the inner body (40) are configured for producing a snap-action connection.

4. Liquid dispenser (10) according to one of the preceding claims, having the following further features: a. the main body (30) has a sleeve-shaped wall (34) within which the second media chamber (24) delimited by the inner body (40) is arranged, and b. an external thread (32) of the media-reservoir thread (32, 42) is provided on an outer side of the sleeve-shaped wall (34), and c. the inner body (40) has a sleeve portion (44) which is arranged outside the sleeve-shaped wall (34) of the main body (30) and on whose inner side an internal thread (42) of the media-reservoir thread (32, 42) is provided.

5. Liquid dispenser (10) according to one of the preceding claims, having the following further feature: a. the media-reservoir thread (32, 42) is assigned a latching device (36, 46) which allows rotationally secured latching of the inner body (40) and the main body (30) in the connection position.

6. Liquid dispenser (10) according to one of the preceding claims, having the following further feature: a. the media reservoir (20) has a tamper-evident portion (47) which, prior to the dispenser being put into use, is formed integrally on the inner body (40) or on the main body (30) and which, during the transfer into the connection position, is separated from the inner body (40) or from the main body (30).

7. Liquid dispenser (10) according to one of the preceding claims, having the following further features: a. the liquid dispenser (10) has a housing (12) at which the discharge opening is provided, and b. the first media chamber (22) is delimited by the main body (30) and the housing (12), and c. the main body (30) is in the form of a component that is separate from the housing (12), so that it is couplable to the housing (12) when the latter is already filled with medium.

8. Liquid dispenser (10) according to one of the preceding claims, having the following further feature: a. the inner body (40) can be moved partially out of the main body (30) by means of the media-reservoir thread (32, 42), whereby the overall volume of the media reservoir (20) increases.

9. Liquid dispenser (10) according to one of the preceding claims, having the following further feature: a. respective liquids are stored in the two media chambers (22, 24).

10. Liquid dispenser (10) according to one of Claims 1 to 8, having the following further feature: a. a liquid is stored in one of the media chambers (24) and a powder or granulate is stored in the other media chamber (22).

11. Liquid dispenser (10) according to Claim 10, having the following further features: a. the powder or the granulate is stored in the first media chamber (22) and the liquid is stored in the second media chamber (24), and b. a discharge channel which leads to the discharge opening is connected to the first media chamber (22), so that the liquid can be discharged only if it has been transferred from the second media chamber (24) into the first media chamber (22) beforehand.

12. Liquid dispenser (10) according to one of the preceding claims, having the following further feature: a. the dispenser (10) has an elongate housing (12) extending in the direction of a main extent axis, and an actuating pushbutton (58) for actuating a pump device (50) is in the form of a laterally arranged actuating pushbutton (58) which is able to be pressed in radially for the purpose of actuating the pump device (50).