The invention relates to a reusable frothing device for the use in a device for making beverages, like for instance in a cappuccino machine or in a machine for making frothed milk.
It is known to provide means for frothing hot milk in machines for making hot beverages, like for instance in modern coffee machines, in order to mix the frothed hot milk for the finishing of the hot beverage like for instance with coffee. For the generation of the milk froth, commonly the Venturi-principle is used. Herein, hot water vapor is led under-pressure through a first pipe, which is connected to a further pipe. By the hot water vapor flow in the first pipe, an under-pressure is generated in the further pipe. When this further pipe is now connected to a milk container, milk is sucked in by the water vapor flow and is also sucked into the first pipe. Commonly, the first pipe leads to an expansion chamber in which milk froth is generated from the milk by the sudden expansion and the impact of the hot water vapor.
Document U.S. Pat. No. 4,715,274 discloses an example for a corresponding Venturi-arrangement for generating milk froth. It is described herein, to lead vapor under-pressure in a pipe by which the hot vapor flows in tangential direction in a cylindrical expansion chamber. This pipe is similar to the above mentioned one: a milk pipe is connected in that milk is sucked in by the vapor flow and the Venturi-effect and in that the milk can flow together with the hot vapor into the cylindrical expansion chamber. This milk-steam mixture is further mixed by circulation in the cylindrical chamber, wherein the generation of milk froth is further supported. At a port of the expansion chamber, which is provided therefore, the finished milk froth exits for the further use.
A further development of this kind of devices for the generation of milk froth is disclosed in document EP 0 813 834 A1. Similar to the above described example, also herein a flow of hot vapor is used in order to generate by the Venturi-effect an under-pressure in a connected further pipe by which milk is sucked in. By the mixing of hot vapor with milk and the subsequent expansion, milk froth is generated from the milk, which may be for instance used for the preparation of cappuccino.
A disadvantage of such conventional devices for the generation of milk froth is the often relatively difficult cleaning of the devices. The cleaning of pipes or flexible tubes, which are necessary for the supply of beverage liquids in particular of milk to the Venturi-device, is often difficult and only possible in an incomplete manner. In particular when milk is used, solid residues may appear, which may lead to hygiene problems if they stay for a longer period of time in the pipes or flexible tubes due to the difficult cleaning. An option to circumvent this disadvantage is the use of one-way-cartridges, which already contain the necessary beverage ingredients and which may be used for one time or possibly also for limited several times in a beverage machine so that supply pipes or flexible supply tubes are not necessary. After the use, such one-way-cartridges are simply disposed and a cleaning is not necessary.
A-one-way-cartridge of the above mentioned kind is for example disclosed in document US 2008/0250937 A1. This one-way-cartridge comprises a reservoir for instance for coffee, a reservoir for instance for milk and a channel system for the guiding of the beverage liquids. A corresponding channel is connected to each of the reservoirs, wherein the channel is also connected to a channel for the supply of steam from outside. According to the U.S.' 937, both, the reservoirs and the channels may be realized in the form of cavities in a base body, which is sealed by a film.
The cartridge is inserted into a beverage machine for the use, wherein the channels to the vapor pipe are connected to corresponding vapor supply pipes of the machine. During the use, vapor is led by the beverage machine into the channel system of the one-way-cartridge in that an under-pressure is generated in the channels, which are connected to the reservoirs, wherein the under-pressure sucks the beverage liquids into the channel system. Thus, if milk is stored in one of the reservoirs, milk froth may be generated by the mixing of milk and vapor, similar to the above described approaches. This milk froth may be led outside after its generation together with the beverage liquid of the other reservoir of the cartridge and thus can be mixed with it.
The one-way-cartridge has to be disposed after a one-time- or after a limited several-times-use, i.e. after some few uses, and has to be replaced by a new one-way-cartridge. Although the above described hygiene problems may be avoided by the provision of this one-way-cartridge, it is herein unsatisfactory that one-way-cartridges are used. The solution of the U.S.' 937 generates waste, which is on the one hand side disadvantageous for the environment and which is on the other hand side not appreciated by many customers.
Thus, it is a problem of the present invention to provide an improved frothing device, for instance for the generation of milk froth for hot beverages like for instance coffee, wherein the above described hygiene problems are avoided and less waste is generated.
The above mentioned problems are solved by a reusable frothing device according to main claim 1. Preferred further developments are described in the sub-claims and the further independent claims, respectively.
In order to solve the above mentioned problems, the present invention provides a reusable frothing device, which may be used for instance in a device for making beverages, like for instance a coffee dispenser. The frothing device is designed in that it may be disassembled in at least two bodies, which may be again connected by means of coupling members and may be separated again from each other. The term “repeatedly useable” means herein for instance a daily cleaning and a period of use of at least several months, preferably several years. At least one of the bodies comprises at its surface cavities, which are accessible in the disassembled state for the sake of cleaning.
Therefore, the reusable frothing device comprises at least a first body and a second body from which the reusable frothing device may be assembled and into which the reusable frothing device may be disassembled again. In other words, the bodies may be connected to a reusable frothing device and may be separated again from this connected state.
Herein, at least one of the two bodies comprises at its surface cavities, which form with a further surface of the other body in the assembled state of the reusable frothing device, complete channels. In a preferred embodiment, the other body preferably comprises complimentary cavities so that the cavities of the one body form together with the cavities of the other body in the connected state complete channels. The channels, which are formed from these cavities, are able to lead liquid, in particular milk or coffee, and are preferably arranged in one (single) sectional plane of the reusable frothing device. Due to the fact that the cavities are arranged in one sectional plane, a particularly simple and effective cleaning is possible.
Contrary to the above mentioned solutions of the prior art, it is possible by the design of the reusable frothing device according to the invention, to disassemble it after the use into the bodies, wherein the cavities, in which the liquids like for instance the milk are led, are freely accessible then and may be cleaned easily. Preferably, the bodies are made of dish washer-safe material like for instance of ceramics, porcelain or glass. But most preferred, the bodies are made of a (preferably injection-molding-manufactured) polymer. Preferably, none of the bodies is realized in the form of a film, since films are commonly not suitable for a many-fold, repeated cleaning. Contrary to such films, it is a core aspect of the present invention, that the bodies according to the invention may be repeatedly connected and separated again.
Thus it is possible to assemble and to disassemble the reusable frothing device repeatedly, wherein coupling members are assigned to the bodies, which allow a repeated connecting and separating of the bodies. Such coupling members may be for instance protrusions and complementary recesses; dovetail connections, tongue-and-groove-connections but also snap-lock-systems.
In a preferred embodiment, at least one of the bodies is provided with sealing members, in order to seal the assembled bodies in view of a leakage of liquid. Such sealing members may be provided for instance in the form of sealing rubbers, which have been inserted into corresponding recesses in the surface of the body or which are directly extruded onto the body. Alternatively, the bodies may be itself made of suitable materials, which are self-sealing due to its material properties. Conceivable are for instance appropriate soft polymers.
For the use, the reusable frothing device is inserted for instance into a device for making beverages, like for instance into a coffee maker. Alternatively, the frothing device may form a separate beverage machine. In a preferred embodiment, the reusable frothing device does not comprise a filled reservoir, which is already filled with a liquid prior to the connection. This constitutes a significant difference to the above mentioned one-way-cartridges, which comprise already filled reservoirs like for instance for milk or coffee. The liquids, like for instance milk or coffee are provided from outside, like for instance by the coffee maker, and are led through the reusable frothing device for the making of the hot beverage.
The reusable frothing device is suitable to be connected with a further supply device by which liquid may be led into the entry openings of the channels. Such a supply device may be for instance a flexible tube or pipe, which is for instance connected with a milk container. But it is difficult to clean flexible tubes or pipes completely from dirt, in particular from milk residues. In order to overcome this problem, the present invention provides a corresponding supply device.
This supply device also realizes the inventive idea, which constitutes the base of the reusable frothing device. Correspondingly, the supply device comprises at least a first supply body and a second supply body, wherein one of the two supply bodies comprises at a surface at least one cavity, which forms together with a further surface of the other supply body in an assembled state of the supply device at least one complete channel, which is appropriate to lead liquid, in particular milk or also coffee.
Accordingly, the present invention provides a system comprising a reusable frothing device and a supply device, which both provide the advantages according to the invention. Finally the present invention provides a machine for making beverages, like for instance a coffee maker, which comprises the reusable frothing device.
In the following, the invention will be described with reference to the accompanying figures. Herein shows:
In the assembled state of the bodies, a fluid, like for instance hot vapor may be led through an inlet port 106 into the reusable frothing device 100 so that the resulting vapor flow in the main channel 105 generates an under-pressure in the secondary channel 107. If the secondary channel 107 is connected at its inlet port 108 to a fluid container, like for instance to a milk container, the milk is sucked in by the generated under-pressure into the main channel and is led together with the vapor into the expansion chamber 109. By the mixing with the vapor and the expansion inside the expansion chamber 109, the milk is frothed. The frothing is additionally supported by a vortex-generation inside the cylindrical expansion chamber.
In order to further abate the frothing of the fluid, in particular of the milk, it is advantageous to connect the secondary channel 107 to the main channel 105 in an appropriate angle α—which is the angle between the tangent of the secondary channel 107 at the inlet point of the secondary channel 107 into the main channel 105 with the main axis of the main channel 105. In a preferred embodiment, α is between 90° and 0°, more preferred between 60° and 10°, even more preferred between 50° and 15°, still even more preferred between 45° and 20° and mostly preferred between 40° and 25°.
In
Such a channel group consisting of the channel pair 120 and the main channel in may be used for instance in smaller coffee- or cappuccino-makers for the home use. But it is possible to combine a plurality of such channel groups to larger arrangements. Such an arrangement, wherein two channel groups are combined, which end up together in a common expansion chamber 109 is for instance shown in
c shows a further embodiment of a reusable frothing device 100, wherein in this case a wave-shaped sectional plane 600 is shown, which is able to provide a particularly sufficient hold of the shown bodies. In spite of the shown wave-shape, also a step-shape is possible.
a to 5d and 6 show the different examples of
In
In
As it can be seen from
An advantageous further development of a possible supply device 500 is shown in
In
An alternative supply device 600, which is realized as an integral member of a further liquid reservoir 900, is shown in
A further alternative supply device 700 is shown in
In this example, both bodies comprise a liquid pipe 710(a) and 710(b), respectively, which comprises in general a semi-circular-shaped cross-section. In the connected state of the two bodies 701, 702, both cavities form a circular channel. The fixation protrusion 705 is formed in a similar manner. The connection of the two bodies is realized herein again via appropriate coupling members, which allow a repeated connecting and separating, like for instance corresponding protrusions and recesses analogous to the embodiment of
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2011/052803 | 2/25/2011 | WO | 00 | 10/28/2013 |