Patent Application
20230309736
The present invention relates to a centrifugal coffee brewer and the cleaning of a centrifugal coffee brewer. Centrifugal coffee brewers are known.
WO2019031964A8 (herein: D1) discloses a centrifugal coffee brewing device, comprising a spinning assembly that is used as a brewing chamber. This spinning assembly comprises a chamber element with a roof and a lower end and is closed off on its sides by a cylindrical filter element. In operation, a coffee bed is formed over the height of this filter element and is wettened by hot water, extracting the coffee beverage. Upon completion of the beverage, the filter element is removed and the coffee bed is expelled due to the centrifugal forces acting on the coffee bed as a result of the rotation. It was found that this device has a number of drawbacks.
A drawback of the device of D1 is that the device is not very easy to clean. Ground coffee and water can reach various parts of the device and contaminate said parts. Ground coffee and scale can build-up through-out the inner workings of the device.
Another drawback of the device of D1 is that, because the brewing process of coffee generally necessitates the passage of hot water through ground coffee, airborne water particles in the form of condensation or steam wetten the inside of the device. Ground coffee residue can accumulate on these wetted surfaces and unhygienic moulds may grow as a result thereof.
Another drawback associated with D1 is that the different parts that are exposed to this wet atmosphere and to ground coffee are not easily taken out of the machine for cleaning or replacement purposes.
It was also recognized that the device of D1 does not allow the brewing of a cup of coffee other than from the beans that are in the hopper, thus limiting the choice of different coffee flavours of a user.
US2018325303A1 discloses a centrifugal coffee brewing device that comprises a self-cleaning brewing assembly. A brewing liquid flows through the same orifice as the ground coffee is supplied through to a brewing chamber. The liquid flows in between brewing cycles and cleans the surface of the interior wall upon which ground coffee may have adhered. A drawback of this device is that only the surface of the interior walls can be cleaned.
WO2013064709A1 discloses a device for the brewing of beverages wherein a special dispensing system dispenses a soluble product to be mixed with water. The device is also suited to be cleaned by removing a hopper with a transport worm system wherein the soluble product is held in the hopper and dispensed by the transport screw. A drawback of this device is that the machine has to be disassembled up to some extend before being able to clean the various components.
WO2008113998A1 relates to an ingredient dispensing apparatus comprising two hoppers and two interconnected transport screws. The rotation of the transport screws in a first direction causes the dispensing of a first ingredient from the first hopper, while the rotation of the transport screws in a second direction causes the dispensing of a second ingredient from the second hopper. Although the invention enables a user to choose between different flavours, a drawback is that two hoppers and two transport screws are needed.
It is an object of the invention to provide a device which suffers less from at least one of the drawbacks mentioned above.
The centrifugal coffee brewing device are disclosed herein provides several independent improvements over the prior art that may lessen the abovementioned drawbacks.
In a first aspect, the invention relates to a centrifugal coffee brewing device comprising:
A centrifugal coffee brewing device as described above is capable of cleaning itself, for example, prior to or after brewing coffee. By providing control signals, the device control system can cause the cleaning of various components. This increases the hygiene of the device and decreases bad influences on the taste of the coffee.
While cleaning the centrifugal coffee brewing device, substantially all the ground coffee used in a brewing cycle has been ejected prior to cleaning, i.e. no ground coffee is supplied to the centrifugal brewing unit between the brewing of coffee and the cleaning sequence thereafter.
In an embodiment, the device control system is configured to drive the centrifugal brewing unit motor and the liquid supply assembly to vary over time at least one of:
In an embodiment, the device control system is configured to select and execute a combination of the cylinder element control signal, the motor control signal, and the liquid supply assembly control signal, to cause the centrifugal coffee brewing device to:
Such a selection of the various signals causes the liquid to flow through the inner workings of the centrifugal brewing unit. By flowing through the various nooks and crannies of the device, the liquid can clean the device without taking it apart. It will be understood that such a user friendly cleaning process means that it will be executed more often, thus resulting in a cleaner device.
Below, various specific cleaning sequences will be elaborated upon to further illustrate the capabilities of a centrifugal coffee brewing device according to the invention.
In an embodiment, the device control system is configured to select and execute a motor control signal that causes the centrifugal brewing unit to eject the volume of liquid. In particular the selection and execution of the motor control signal causes the flushing and pre-heating the flow path of the coffee.
By executing such a motor control signal with a heated amount of liquid inside the centrifugal brewing unit, the flow path of the coffee is rinsed and heated. When this is done before an amount of coffee is brewed, the coffee flowing out of the device will be hot (as little heat has been lost to the pre-heated flow path) and the coffee beverage will not be contaminated with residue from, for example, a prior brewing cycle (as the flow path has been rinsed).
In an embodiment, the device control system is configured to select and execute a motor control signal that causes the centrifugal brewing unit to accelerate and decelerate one or more times before ejecting the volume of liquid.
Such a motor control signal can be used to clean the centrifugal brewing unit and to pre-heat it in a similar manner as described above for the flow path. It can also be used to clean the centrifugal brewing unit more thoroughly.
In an embodiment, the device control system is configured to select and execute a motor control signal that causes a first predetermined volume of liquid to clean the chamber element and a first side of the filter and a second side of the filter. The first side may face towards the chamber element, and the second side may face away from the chamber element.
The first predetermined volume of liquid may be chosen so that when executed, the motor control signal causes the liquid to flow around in the chamber element and on both sides of the filter. This is particularly useful to clean the second side of the filter which would otherwise be particularly difficult to reach.
In an embodiment, a first predetermined volume of liquid is at least one third of an inner volume of the centrifugal brewing unit.
In an embodiment, the supply tube extends into the chamber element. When using the first predetermined volume of liquid, the supply tube may then also be cleaned.
In a further embodiment, the device control system is configured to select and execute a motor control signal that causes the operation of the centrifugal brewing unit motor a predetermined amount of time after the device control system causes the operation of the liquid supply assembly.
In doing so, the liquid is allowed to settle in the chamber element. Additionally, in the case where the liquid comprises a cleaning agent, e.g. a descaling agent, the cleaning agent can have the time to work on the different components before being flushed out.
In an embodiment, the centrifugal coffee brewing device further comprises a cylinder element cavity configured to accommodate the cylinder element in an upper position. A second predetermined volume of liquid can be injected that is larger than an inner volume of the centrifugal brewing unit and that is smaller than the volume of the centrifugal brewing unit and the cylinder element cavity together.
The device control system can be configured to select and execute a motor control signal that causes the second predetermined volume of liquid to flow back and forth through the cylinder element. In particular the flow path may extend between a lower side of the roof portion and an upper side of the roof portion and through the cylinder element. Herein the flow cleans at least the upper side of the roof portion and at least a side of the cylinder element directly facing the first axis and the upper side of the roof portion.
Using this second predetermined volume of liquid, the device may be very thoroughly cleaned. Such a thorough cycle may be executed less often than the previously mentioned sequences, especially if the previous cycles are executed on a regular basis.
In an embodiment, wherein the centrifugal coffee brewing device further comprises a spout and a spout actuator, the spout actuator is configured to move the spout between at least a dispensing state and a closed state. The spout actuator can be controllable by at least one spout actuator control signal to control the spout actuator to provide a movement between at least the dispensing state and the closed state. The device control system is then further configured to select and execute a spout actuator control signal to cause the operation of the spout actuator to move the spout to the closed state at least prior to the operation of the liquid supply assembly and to select and execute a spout actuator control signal to cause the operation of the spout actuator to move the spout to the dispensing state prior to or after the ejecting of the volume of liquid.
In an embodiment, the spout actuator is also configured to move the spout to a drip state. In such a state, the spout is configured to divert a flow from a gutter element into a drip receptacle instead of letting it flow out of the device. For example, this may prevent the spout from dripping outside of the device after a serving of coffee has been brewed.
In an embodiment of the invention, further comprising a coffee gutter extending around the centrifugal brewing unit and towards the spout, the device control system is configured to select and execute a spout actuator control signal to move the spout to the dispensing state after the at least part of the ejected volume of liquid is in the gutter.
In doing so, the liquid may be located in the gutter for a certain amount of time. This can be used to, for example, soak off dirt that has accumulated in the gutter or to, in the case where the liquid comprises a descaling agent, descale the gutter. This way, a component that would be very difficult to access can be thoroughly cleaned, further increasing the hygiene of the centrifugal coffee brewing device.
In a further embodiment, the liquid supply assembly further comprises a direct water injection nozzle and the device control system is configured to select and execute a combination of the cylinder element control signal, the motor control signal, and the liquid supply assembly control signal, to cause the centrifugal coffee brewing device to successively:
In an embodiment, wherein the bottom wall comprises a partially upward projecting seal, the third predetermined volume of liquid is substantially equal to a volume defined by the bottom wall and the partially upward projecting seal.
By causing the centrifugal coffee brewing device to follow the abovementioned steps, a residue deflection cone that is located around the centrifugal brewing unit may be uniformly wettened: the liquid that is held by the bottom wall is circumferentially ejected towards the residue deflection cone. Subsequently, the residue deflection cone is cleaned by the direct injection of the liquid by the direct water injection nozzle against it.
In an embodiment, the device control system is configured to repeat the selection and execution of at least one of the cylinder element actuator control signal, centrifugal brewing unit motor control signal, liquid supply assembly control signal, spout actuator control.
In an embodiment, the device control system is configured to select and execute the predetermined sequence an amount of time after the centrifugal coffee brewing device has been used to brew coffee. In particular, it is configured to do so after 0-15 minutes, more in particular after 5-10 minutes, even more in particular after 7 minutes.
Such a sequence can be used to clean the centrifugal coffee brewing device after an amount of coffee has been brewed and dispensed. This leaves the centrifugal coffee brewing device clean and ready for the next brewing cycle.
In another independent aspect, the invention relates to a centrifugal coffee brewing device comprising:
A centrifugal coffee brewing device as described above is capable of drying itself, for example, prior to or after brewing coffee. By providing the abovementioned control signals, the device control system can cause the internal drying. Because a coffee brewing device is a device that operates with hot liquids, it is inherently a wet and/or humid device susceptible of moulds. Therefore being able to dry itself is a large advantage for the prevention of moulds and the increase of hygiene, intended coffee taste and overall user experience.
When drying the centrifugal coffee brewing device, substantially all the ground coffee used in a brewing cycle has been ejected, i.e. no ground coffee is supplied to the centrifugal brewing unit between the brewing of coffee and the drying sequence thereafter.
In an embodiment, the device control system is configured to select and execute a combination of the motor control signal and the heater element control signal, to cause the centrifugal coffee brewing device to:
By heating the residue deflection cone, the air that is contact therewith is also heated. Combining this with the centrifugal brewing unit that moves the hot air around, the centrifugal coffee brewing device can be dried.
In an embodiment of the invention, further comprising a cylinder element actuator configured to move the cylinder element upwards and/or downwards, the cylinder element actuator is controllable by at least one cylinder element actuator control signal. By controlling the cylinder element actuator an upwards and/or downwards movement of the cylinder element is provided. The device control system is configured to select and execute a cylinder element actuator control signal. Herein, the device control system is configured to select and execute a cylinder element actuator control signal, to cause the cylinder element to move upwards or downwards prior to the operation of the centrifugal brewing unit motor.
In an embodiment, the device control system is configured to select and execute a cylinder element actuator control signal, to cause the cylinder element to move upwards prior to the operation of the centrifugal brewing unit motor.
In another embodiment, the device control system is configured to select and execute a cylinder element actuator control signal, to cause the cylinder element to move downwards prior to the operation of the centrifugal brewing unit motor.
The choice of the location of the cylinder element determines how the air flows within the centrifugal coffee brewing device. For example, with the cylinder element in the upper position, the air is directed towards a residue tray and a residue tray compartment that may be located below the centrifugal brewing unit. When the cylinder element is in the lower position, the air may, for example, be driven out of the device through the spout. In any case, various openings may function as air outlets and various openings may function as air inlets.
In an independent aspect, the invention relates to a centrifugal coffee brewing device, comprising:
Such a coffee brewing device allows the simple placement and replacement of a transport screw for maintenance and cleaning purposes. In doing so, the centrifugal coffee brewing device does not have to be taken apart to take out and clean a component that is exposed to wet air and to ground coffee. This results in a cleaner coffee brewing device and therewith in better coffee.
In an embodiment of the centrifugal coffee brewing device, only the transport screw can be removed through the hole. One way to achieve this, would be to match the hole's inner dimensions with the transport screw's outer dimensions.
In an embodiment, the centrifugal coffee brewing device also comprises a removable cover for the hole. This may improve the aesthetics of the device and may also keep dirt and dust out of the centrifugal coffee brewing device.
In an embodiment, the centrifugal coffee brewing device further comprises a transport screw cap. The transport screw cap comprises means to be fixed in a protection position. In this position, the transport screw cap at least partially covers the transport screws and the transport screw drive. This prevents moving parts being exposed to a user when the cover has been removed, increasing the user safety of the machine.
The transport screw cap may also comprise a hook element, wherein at least a part of the hook element is located behind a part of the transport screw and wherein the hook is configured to engage the transport screw when the transport screw cap is moved away from the protection position. The transport screw cap facilitates the removal of the transport screw.
The transport screw cap may further comprise a removal tab. The removal tab extends away from the transport screw when the transport screw cap is in the protection position. The removal tab increases the ease of removal of the transport screw cap.
In an embodiment, the supply tube is curved and the transport screw is flexible. This way, the transport screw can rotate within the curved supply tube without breaking.
In another embodiment, the supply tube is not curved, but the transport screw is flexible. This increases the ease of removal of the transport screw.
In an embodiment of the centrifugal coffee brewing device, an opening is defined in the cover. Alternatively, the cover only partially covers the hole. Both solutions can be used to create an air channel between the centrifugal brewing unit and the exterior of the housing. This may reduce the formation of unhygienic moulds.
In another independent aspect, the invention relates to a coffee brewing device, comprising:
The use of a coffee brewing device as described above offers the advantage of being able to use two different bean supply paths. This enables a user to experience different flavours of coffee while not needing to empty the hopper before filling it with a new type of coffee bean; the user can experience the new type of coffee parallel to the coffee present in the hopper via the second bean supply path.
In an embodiment, the chute exit opening is moveable between an upper position in the retracted state and a lower position in the extended state.
In an embodiment, the chute engages the hopper exit opening in the extended state.
In an embodiment, the chute comprises a flexible skirt located at the chute exit opening. Such a flexible skirt permits the chute to be extended even though there might still be coffee beans from the hopper in the way; the chute will still create the second bean supply path, because the skirt will deform around said coffee beans.
In a further embodiment, the chute at least partially obstructs the first bean supply path in the extended state. In doing so, the chute prevents the first bean supply path and the second bean supply path to cross and therewith prevents the mixing of different types of coffee beans.
In a further embodiment of the coffee brewing device the chute comprises a telescopic mechanism. In such an embodiment, at least part of the chute is fixed with respect to the coffee brewing device when the chute is located in the chute position.
In an embodiment, the chute comprises a fixed part being fixed relative to the hopper and a rotational part, wherein the rotational part is rotatable by a user. The fixed part comprises one of a cam or a helical cam track and the rotational part comprises the other. The rotation of the rotational part moves the cam over the helical cam track or the helical cam track over the cam. The cam movement or helical cam track movement moves a lower part comprising the chute exit opening between the upper position and the lower position.
The chute may comprise a first rotational upper part, a fixed part, and a second rotational lower part. Herein, the first rotational upper part comprises at least one vertically oriented slot, the second rotational lower part comprises at least one cam, and the fixed part comprises at least one helical cam track defining at least one hole. The at least one cam protrudes outwardly through the at least one hole defined by the cam track into the at least one vertically oriented slot. The rotation of the first rotational upper part—and the vertically oriented slot—drives the cam of the second rotational lower part over the helical cam track because the wall of the vertically oriented slot abuts against the cam. The rotation of the upper part extends and retracts the chute between the extended state and the retracted state, moving the chute exit opening between the lower position and the upper position.
In an embodiment, the coffee brewing device comprises a protection cover, the protection cover being configured to be located in the inner volume of the hopper and near the grinder, wherein the chute extends through the protection cover.
In an embodiment, the protection cover is also the fixed part of the chute.
In an embodiment, the chute comprises an obstruction between the chute filling opening and the chute exit opening. This obstruction is configured to allow beans to move between the chute filling opening to the chute exit opening and to prevent a user to reach the chute exit opening when the chute is located in the chute position.
If such an obstruction wasn't present, a user could potentially reach the grinder. It will be understood that this is a less than desirable situation.
In a further embodiment, the obstruction is fixed to the lower part and closes the chute filling opening when the chute is in the retracted state.
In a further embodiment, the chute is removable between the chute position and a removed position and comprises fixation means to fix the chute with respect to the hopper in the chute position.
These and other aspects of the invention will be more readily appreciated as the same becomes better understood by reference to the following detailed description and considered in connection with the accompanying drawings in which like reference symbols designate like parts.
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In
In order to be able to brew coffee, a liquid supply assembly comprises a liquid inlet channel 244 and a direct water injection nozzle 26. The liquid supply assembly is configured to supply liquid into the chamber element, wherein the liquid can comprise water and/or a cleaning agent.
The centrifugal coffee brewing device 10 also comprises a coffee supply assembly comprising a grinder 22 (not depicted here) and a supply tube 221 in which a transport screw (not depicted here) may be present to supply ground coffee to the chamber element 14.
A coffee brewing cycle would be initiated by the grinder 22 producing ground beans that enter the chamber element 14 via the supply tube 221, which on one side is connected to the grinder and on the other to the chamber element 14. In turn, the liquid supply assembly 242 would provide water via the liquid inlet channel 244 and the direct water injection nozzle 26 that is connected to the stationary roof part 146 into the chamber element 14. Also, the chamber element 14 would be driven to rotate by the centrifugal brewing unit motor 121 that drives the rotation of the centrifugal brewing unit 12 via the shaft 122. The cylinder element 16 comprising the filter 162 rotates together with the chamber element 14. When the cylinder element is in the lower position 168, the seals 143, 145 engage the cylinder element 16 in order not to let a liquid flow substantially out of the chamber other than through the exit opening 163 (depicted in
After having brewed coffee, the cylinder element 16 is moved into the upper position 166 by the cylinder element actuator 164 and the used coffee grounds are ejected from the chamber element 14 due to the centrifugal force of the rotation. They are redirected in a downwards direction by the residue deflection cone 82 and collected in a residue tray (not depicted).
In
Herein, the device control system 20 is configured to select and execute a predetermined sequence of the abovementioned signals 204, 206, 207, 208, 209. The selection and execution of such a sequence can cause the cylinder element 16 to move upwards and/or downwards, can cause at least the chamber element 14 to rotate at a specific speed and in a specific direction, can cause the liquid supply assembly 242 to provide a specific volume of liquid, can cause the spout 18 to be moved into a dispensing state and a closed state, and can cause the heater element 30 to heat.
Such a sequence can be used to clean and to dry the centrifugal coffee brewing device 10 when the centrifugal coffee brewing unit 12 is substantially free of unbrewed ground coffee during the predetermined sequence. Non-limiting examples of specific sequence are elaborated upon below.
Turning to
In the depicted sequence, the predetermined volume of liquid 282 is larger than an inner volume of the centrifugal brewing unit 12; the rotational roof portion 144 of the chamber element 14 is submerged and an extremity of the supply tube 221 and the transport screw 40 are also submerged. In this embodiment, the supply tube 221 is shown to extend into the chamber element 14. It can be seen that the predetermined volume of liquid 282 is smaller than the volume of the centrifugal brewing unit 12 and the cylinder element cavity 17 together.
Through the selection and execution of a motor control signal, the liquid of the predetermined volume of liquid 282 may flow back and forth through the cylinder element, in particular the flow path may extend between a lower side of the roof portion and an upper side of the roof portion and through the cylinder element. The flow then cleans at least the upper side of the roof portion and at least a side of the cylinder element directly facing the first axis and the upper side of the roof portion.
By selecting and executing a motor control signal that causes the centrifugal brewing unit 12 to accelerate and decelerate at least once, the inner workings of the centrifugal coffee brewing device 10 are cleaned. In particular, difficult to reach areas such as the space between the filter 162 and the cylinder element 16 and the top of the rotational roof portion 144 are cleaned. This is a large benefit because this wouldn't be possible without taking the entire device apart.
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The sequence described above and depicted in
In
The volume of liquid used in the described sequence may be heated so that the flow path of coffee that is to be brewed is pre-heated. Such a sequence may then be execute prior to the brewing of coffee.
In
Both sequences depicted in
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The depicted sequence is similar to the sequence depicted in
Through the selection and execution of a motor control signal, the liquid of the predetermined volume of liquid 281 may flow back and forth through the cylinder element. The sequence causes the first predetermined volume of liquid 281 to flow inside the chamber element 14 and along a first side of the filter 162 and along a second side of the filter 162. The first side faces towards the chamber element, and the second side faces away from the chamber element.
The device control system 20 may select and execute a sequence as mentioned above one or more times. Subsequently, a centrifugal brewing unit motor control signal 206 may be chosen that causes the centrifugal brewing unit to rotate more rapidly, ejecting the predetermined volume of liquid 281 through the filter 162 and via the cylinder element 16 into the gutter 80. This is depicted in
Such a sequence can be useful for the regular cleaning of the centrifugal coffee brewing device 10, while the use of the second predetermined volume of liquid 282 may be useful for an even more thorough cleaning that can be executed after a longer period of time.
In
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The sequence depicted in
In
In
It will be understood that the device control system 20 can be configured to repeat the selection and execution of at least one of the cylinder element actuator control signal, centrifugal brewing unit motor control signal, liquid supply assembly control signal, spout actuator control in any possible order. In this way the above sequences may be combined to arrive at even better cleaning sequences.
Moving to
The device control system 20 has been configured to select and execute a predetermined sequence of the at least one heater element control signal 207 and the at least one motor control signal 206. This selection and execution of the predetermined sequence causes the heater element 30 to heat at least the residue deflection cone 82 and causes at least the chamber element 14 to rotate at a specific speed and in a specific direction. During this rotation, the centrifugal brewing unit 12 is substantially free of unbrewed ground coffee and the liquid supply assembly 242 does not supply a liquid into the chamber element 14 during the predetermined sequence.
The selection and execution of the predetermined sequence causes the centrifugal coffee brewing device 10 to operate the heater element 30 to heat at least the residue deflection cone 82 and to operate the centrifugal brewing unit motor 121 to provide a rotational speed of the centrifugal brewing unit 12. In doing so, at least part of the air located inside the centrifugal coffee brewing device 10 is heated; this increases the drying of the device. Further, the rotation of the centrifugal brewing unit 12 causes the heated air to circulate through the centrifugal coffee brewing device.
In
In
Turning to
The choice of the location of the cylinder element determines how the air flows within the centrifugal coffee brewing device. In any case, various openings may function as air outlets and various openings may function as air inlets
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The centrifugal coffee brewing device is shown to comprise a removable cover 152 for the hole; in
It can be seen in
In the embodiment shown in
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In the depicted embodiment, the chute 60 extends through a protection cover 58 that is located in the inner volume 52 of the hopper. Such a protection cover 58 is located above a grinder to keep users from accessing the grinder.
In
The chute 60 further comprises a first rotational part 73 and a second rotational part 74, the first rotational part being rotatable by a user. The fixed part 72 comprises a helical cam track 78 and the second rotational part 74 comprises a cam 76. The rotation of the first rotational part moves the cam over the helical cam track. Herein the cam movement moves the second rotational part comprising the chute exit opening 64 between the retracted state 66 and the extended state 68.
The rotation of the first rotational part 73 moves the cam 76 over the helical cam track 78, because the cam protrudes through the hole defined by the helical cam track into a vertically oriented slot 77 in the first rotational part. When rotating the first rotational part 73, the vertically oriented slot 77 exerts a horizontal force on the cam 76. The cam in turn moves over the helical cam track 78 and because the helical cam track is partially vertically oriented, the cam 76 also moves vertically in the vertically oriented slot 77 of the first rotational part 73.
In
The terms “a” or “an”, as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and/or having, as used herein, are defined as comprising i.e., open language, not excluding other elements or steps.
Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention. It will be recognized that a specific embodiment as claimed may not achieve all of the stated objects.
The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
White lines between text paragraphs in the text above indicate that the technical features presented in the paragraph may be considered independent from technical features discussed in a preceding paragraph or in a subsequent paragraph.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/074939 | 9/7/2020 | WO |
