Kitchen appliance

Abstract

The present invention relates to a device for processing food, comprising a motor which is designed to drive a means for processing food, a control means via which the user can control the motor, wherein the control means has a first and a second actuating means which are provided separately from one another and can be actuated separately by a user in order to cause the motor to drive the means for processing food, wherein the device can be operated in such a way that, when the first actuating means is actuated, the motor drives the means for processing food even after the actuation of the first actuating means has come to an end, and wherein, when the actuation of the second actuating means has come to an end, the motor no longer drives the means for processing food.

Description

[0001] kitchen appliance

[0002] Technical field

[0003] The present invention relates to devices for processing foodstuffs.

[0004] State of the art

[0005] In the catering industry, but also in private kitchens, electrically powered kitchen appliances are used. These appliances allow various tasks to be performed significantly faster and more efficiently than by hand, such as chopping, slicing, shredding, kneading, etc.

[0006] The electric kitchen appliances used for this purpose often have a base containing a motor. A container is mounted on this base, which can hold various processing attachments, typically interchangeable, as described above, for different tasks. The container usually has a lid with a feed tube through which additional food can be added during operation.

[0007] Due to their often heavy base with the motor, these kitchen appliances are very stable on a work surface and can be operated continuously. This allows a user to leave the appliance running unattended while performing longer tasks, such as kneading dough, and to do something else during this time. In this state, the user also has both hands free, for example, to add more ingredients. The disadvantages are that these appliances are large, relatively expensive, and limited in their adaptability. Examples of such appliances include stand mixers and food processors. Another type of kitchen appliance is the immersion blender.Stick blenders are inexpensive and space-saving and can be used more flexibly than specialized kitchen machines, as they can perform tasks that larger kitchen appliances and food processors cannot, such as mixing ingredients, e.g., directly in a cooking pot, whipping cream, or chopping small quantities of food.

[0008] Prior art attempts have been made to combine the capabilities of both types of appliances by attaching a kitchen appliance attachment to immersion blenders, enabling them to perform most of the tasks a food processor can. Such an attachment is described, for example, in US 11,963,638 B2. Due to the design of an immersion blender, in such arrangements the motor unit is typically attached to the lid of the appliance's vessel and drives the processing tools from above. This results in the disadvantage of a top-heavy setup, leading to low stability on a work surface. Furthermore, the operating controls, such as the knobs, are usually located on the top of the motor unit, which reduces user-friendliness when the motor unit is attached to a tall appliance vessel.Furthermore, for safety reasons, immersion blenders always require a dead man's switch, which prevents the blender from operating without continuous user intervention. This prevents the user from unintentionally reaching into the rotating parts, especially when handheld. Accordingly, current technology requires a user to continuously press a button on immersion blenders to operate the motor.

[0009] Another prior art kitchen appliance is described, for example, in CN 101 584 561. According to this prior art, the stability problems should be improved by inserting an intermediate base between the appliance's vessel and the motor unit. The intermediate base supports the vessel and the motor unit and drives the processing tools from below. This reduces the overall height of the appliance. However, it does not address the other disadvantages. Additionally, there is another safety issue: the tool is now also connected to the drive system when the lid is open. Therefore, the user could potentially come into contact with the rotating tools if the appliance is operated without the lid.

[0010] In KR 101 717 011 Bl and US 2024 / 0074618 Al, a safety interlock is introduced to prevent this unsafe condition. However, the mechanism of this interlock is not disclosed. Additionally, these two documents integrate a control unit into the base unit to improve handling. This secondary control unit communicates with the motor unit and can control it remotely. While this improves handling, it significantly increases complexity and cost. Furthermore, handling becomes more complex because the user now has to use different user interfaces for different tasks, depending on whether they want to use the immersion blender handheld or when it is attached to the base.

[0011] The CN 105 411 432 B aims to solve the problem of having to continuously hold down the control button to power the processing tool. It activates an automatic mode when the base is detected by the motor unit. In this mode, the appliance can operate for a pre-set time after the button is pressed, eliminating the need to keep the button pressed. However, this also limits the user's influence on the processing cycle, as it would be advantageous to have a manual operation option where the appliance only runs as long as the user holds down a button.It is also not user-friendly that the automatic mode is activated automatically by a specific, for example, prolonged, actuation of the speed switch already used for temporary operation, without the user having to make any special input. This is disadvantageous because unintentional activation of the automatic mode can occur, namely if the user accidentally operates the speed switch, which is otherwise intended for temporary operation of the engine, in such a way that continuous operation is activated. A similar situation is also described in KR 101 771 331 Bl.

[0012] In this state of the art, the safety issue of operating with the lid open is solved by mechanically disengaging the gearbox when the container is open. However, this is not ideal because if the user operates the motor unit before the lid is closed and then closes the lid, the coupling engages at full motor speed. This can lead to damage to the device, especially the gearbox.

[0013] EP 0 549 818 Al, WO 2010 / 082857 Al, and US 5,129,589 describe base units without such a mechanical decoupling of the gearbox to solve the safety issue. In this design, the motor unit can only be attached to the base unit when the lid is already attached to the container. After food processing is complete, the lid cannot be removed until the motor unit has been detached. While this solves the safety problem, it is not very user-friendly, as a specific sequence of actions is required to operate the appliance. It is also very inconvenient if one only wants to open the lid briefly, for example, to add ingredients.

[0014] Description of the invention

[0015] The present invention aims to alleviate or eliminate one or more of the aforementioned disadvantages.

[0016] The invention is defined by the independent claims. Preferred embodiments are defined in the dependent claims.

[0017] In various embodiments of the invention, a base serves as the basic structure. This base has a receptacle for a detachable motor unit, which is typically in the form of a handpiece, for example, for a hand blender. The base also has a receptacle for a container. This container can be coupled to the base and serves to process food via a food processing means provided within it. A power transmission device is provided in the base, which serves to transmit the driving force of the motor unit to the food processing means. The details of this arrangement are described below.

[0018] According to the invention, a food processing device, which may be, for example, a food processor or a hand blender with attachments, comprises a motor. The motor is designed to drive a food processing element. This element may be, for example, a rotating blade for chopping food, a whisk, a mixing attachment, a dough hook, cutting or grating discs, or similar.

[0019] Furthermore, a control device is provided through which the user can control the motor. This control device can, for example, take the form of several switches. However, it is also possible to implement this via a touch panel or similar device.

[0020] The control device has a first and a second actuation device. These are separate and can be operated independently by a user to cause the motor to drive the food processing device. The first and second actuation devices can, for example, be different areas on a touch panel that are spaced apart and can therefore be operated separately by a user, or they can be two spaced-apart switches, or a combination of both. Actuation of the first and second actuation devices controls the motor.

[0021] The device is designed so that, upon activation of the first actuating device, it can continue to drive the motor even after the activation of the first actuating device has ceased, thus enabling the motor to drive the food processing equipment. In other words, the first actuating device is designed to allow operation independent of continuous activation. This can mean, for example, that the motor continues to run indefinitely after activation of the first actuating device, or that it continues to run until it is deactivated by a second activation of the first actuating device, or until it is deactivated by the motor's control system due to the expiration of a predetermined time or program.

[0022] In contrast, once the second actuation is released, the motor will no longer drive the food processing device. This makes it possible, for example, to activate an operating mode using the second actuation in which the food processing device only operates while the second actuation is being used. By providing two separate actuations—one for hands-free operation (first actuation) and one for manual operation (second actuation)—and by spatially separating them, unintentional activation of the hands-free mode is less likely. This increases the user-friendliness and safety of the device.

[0023] Preferably, the first and second actuating devices consist of buttons. Such buttons are easy and intuitive for a user to operate. In principle, however, it is also possible to use toggle switches, touchpads, or any other type of actuating device, especially those with touch-sensitive buttons. Since there are no moving parts, such buttons are easy to clean and can easily be made waterproof.

[0024] Preferably, the second actuating element is designed to control the motor's speed. This can be achieved, for example, by increasing the motor's speed with a stronger actuation of the second actuating element. This can be done, for instance, depending on the button's travel or the actuation force. In principle, however, there are other ways to control the motor's speed via this second actuating element. For example, a speed control element can be provided separately from this second actuating element.

[0025] Preferably, the device includes a display to indicate its operating status. This display can show, for example, that the device can be operated in hands-free mode, meaning the kitchen appliance can be used without using the first and / or second control. It can also indicate that the kitchen appliance is currently operating in hands-free mode. Furthermore, it can display a variety of other information, such as the current speed, a timer, a speed preset, or a specific program that is currently running.

[0026] Preferably, the device has a timer that can be set and is ideally displayed on the display. This simplifies food processing, as the desired processing time can be set as needed, ensuring that the food processing stops when the time has elapsed. Displaying the timer also makes operation easier, as the user knows how long the device will be running.

[0027] Preferably, the device is designed such that when the first actuating element is activated, the food processing device is operated continuously, and that when the first actuating element is activated a second time after the first, the food processing device is no longer operated. In this respect, the first actuating element can be used as an on / off switch for the continuous operation of the motor and thus for the continuous operation of the food processing device. This increases user-friendliness, as many users are familiar with such an on / off switch function from their everyday lives.

[0028] The device further includes a means for detecting coupling with the base. This means detects whether the device is coupled to a base that enables hands-free operation. This can be the case, for example, if the base is designed to hold the motor and any components surrounding the motor securely, making it unlikely that the motor will fall during operation. The device is also preferably designed such that operation of the motor without continuous actuation of the first actuating means is only possible when coupling of the device to the base is detected. This increases safety by ensuring that hands-free operation is only possible when the motor is coupled to the base.This prevents the hands-free mode from being activated in handheld operation (i.e., without being connected to the base), which would endanger the user.

[0029] Preferably, the base has no operating elements. Since no electrical components are included, it is not necessary to manufacture it as splash-proof for occupational safety reasons, which simplifies production.

[0030] Preferably, different operating modes can be preselected for the first and / or second actuating means. These could include, for example, driving the food processing device in different ways – such as in a slow or fast mode, a pulsed mode, a mode where the speed is initially fast and then slow, etc. This increases flexibility in food processing.

[0031] Preferably, when the device is operated by actuating the second actuating means, the speed of the motor can be controlled by an additional adjusting means. This increases flexibility in food processing.

[0032] Preferably, during operation of the device, preset automatic program sequences can be executed based on the actuation of the first actuating device. This simplifies food processing, as the preset program sequences can be used.

[0033] Preferably, the food processing device is automatically stopped after the expiration of a program or timer that is factory preset and cannot be manipulated by the user. This increases operational safety and the service life of the device, as it prevents the device from operating indefinitely.

[0034] The motor is also preferably part of a handle for a stick blender or hand mixer. This increases the flexibility in the use of such a motor, because it can also be used for handheld tasks such as puréeing, whipping cream or mixing dough.

[0035] Alternatively, a food processing device according to the invention comprises a food processing motor that can be controlled by a user. The motor is provided in a handpiece. Furthermore, a base is provided according to the invention, which can be detachably coupled to the handpiece. The motor serves to drive a food processing element that is coupled to the base. This element can be the one already mentioned above.

[0036] According to the invention, the device is designed to detect coupling between the handpiece and the base. The device is further designed such that, when coupling between the handpiece and the base is detected, the motor can be operated in different operating modes than in a state where no coupling between the handpiece and the base is detected. An operating mode is understood to mean, for example, whether it can be operated continuously without user intervention, at what speed it can be operated, with which speed profiles it can be operated, which programs are available, and / or how long it can be operated for a maximum duration.

[0037] Through appropriate design, the user is given greater freedom in using the device for food processing. In particular, the motor, which is typically part of a larger component, can be operated in different modes depending on whether it is coupled to the base or not. Thus, when coupled to the base, it can operate differently, for example, in a hands-free mode, i.e., a mode in which the motor operates even without continuous user input, compared to when decoupled from the base, where such a hands-free mode is deactivated.

[0038] Preferably, when the motor or a handpiece containing it is coupled to the base, the motor can be operated without a user continuously operating any control provided on the motor. This increases safety by only allowing such operation without actuating a control provided on the motor if the motor is coupled to the base and thus designed to be more secure and less prone to tipping, and if the food processing device is not accessible to a user within a closed container.

[0039] Preferably, the motor or the handpiece containing it has one or more detection devices, and the base has one or more detection features. The device detects the coupling of the motor / handpiece to the base through an interaction of the detection features with the detection devices. This increases user-friendliness and, in particular, reliability, since such a design allows the coupling of the motor / handpiece to the base to be determined with high reliability.

[0040] Preferably, the detection features are acquired without contact. This reduces wear and tear and also makes it possible to place the detection features inside the base, so that they are not damaged when the device is cleaned with water or similar substances.

[0041] Preferably, one or more detection features incorporate magnets. These detection devices are designed to detect magnetic fields. Through appropriate design, contactless detection of the coupling can be achieved. In particular, magnetic fields penetrate plastic housings, which allows the magnets and corresponding detection devices to be securely arranged inside the device. This facilitates cleaning of the device and prevents tampering by the user. Preferably, the one or more detection devices incorporate Hall effect sensors and / or reed switches. Through appropriate design of the detection devices, magnetic fields can be reliably detected.

[0042] Preferably, the handpiece has recesses and the base has projections. These projections are designed to engage in the recesses when the handpiece is coupled to the base. This defines the positioning of the motor / handpiece relative to the base, enabling or facilitating reliable coupling. It also stabilizes the positioning of the motor / handpiece relative to the base, which is advantageous for operational reliability. Preferably, the handpiece can be coupled to the base in at least two orientations. This facilitates adaptation to a user's preferences and whether they are right- or left-handed.

[0043] Preferably, the device is operated exclusively via controls on the handpiece. This allows for a simpler design of the base. Furthermore, user-friendliness is increased, as a user is already familiar with the operation and control of the handpiece via its integrated controls, provided they have previously used the handpiece for other purposes.

[0044] Preferably, the base has no electrical components. This simplifies its manufacture and reduces the requirements for water resistance, making it more cost-effective to produce.

[0045] Preferably, the handpiece has a handle and can be used as a drive for handheld household appliances, such as immersion blenders and / or hand mixers. This increases the flexibility of use.

[0046] Preferably, one of the detection devices is designed to detect the presence of a lid on a container coupled to the base. Operation of the motor, which is coupled to the base via the handpiece, is only permitted if a lid is attached to the container. This increases safety.

[0047] Preferably, the coupling of a lid to the container is detected by a magnet that is moved and detected by a sensing device. This enables contactless detection of the coupling of the lid to the container. According to an alternative aspect of the invention, a food processing device comprises a base and a container. This container is provided at the base and is configured so that food is processed within it by means of a food processing device. This means can be the device already described. The container further comprises a lid that can be detachably coupled to the container to close it. The device additionally comprises a motor provided in a handpiece that is coupled to the base. The motor is designed to drive the food processing device.The motor can be permanently attached to the base, but it can also be detached from it, especially without tools.

[0048] The device incorporates a mechanism that allows the motor to operate only when the lid is coupled to the container. This ensures that a user cannot reach into the container while the motor is running, thus increasing the device's safety. By preventing motor operation with the lid open, the device's service life is extended, eliminating the need for a disconnection of the drive train between the motor and the food processing unit, as is required in the prior art. As mentioned above, disconnecting such a drive train would have the disadvantage of potentially damaging the clutch when it engages. Therefore, this design extends the service life of the food processing unit and reduces the risk of operator error.

[0049] Preferably, the motor includes a sensing device that detects a magnetic field. This allows the coupling of the lid to the container to be detected. With a suitable design, this coupling of the lid to the container can be transmitted to the motor without physical contact, which reduces wear and makes the device easier to clean. Furthermore, it is also possible to transmit a magnetic field through a closed container, particularly one made of plastic, thus enabling hermetic encapsulation of the sensing device. Preferably, the sensing device includes a Hall sensor and / or a reed switch. Reed switches are reliable and offer high reliability.

[0050] In this context, it is preferred that the base includes a first magnet which is movably arranged within the base. The base is designed to move the first magnet within the base due to the coupling of the lid to the container, such that the magnetic field at the location of the detection device changes, thereby detecting the coupling of the lid to the container. This allows the coupling of the lid to the container to be reliably transmitted to the detection device by sensing the magnetic field without physical contact.

[0051] In this context, it is preferred that the container has a pin or a comparable movable element that extends through the lid when the container is closed and is thus displaced downwards relative to the container. The base has a transmission element against which the extended pin acts. This moves the first magnet in such a way that the detection device registers a coupling between the lid and the container. Such a design is easy and reliable to implement and thus results in a more reliable safety device.

[0052] It is further preferred that the container can be coupled to the base via a bayonet or screw connection. The transmission element is also designed to move the first magnet, so that the detection device registers the coupling of the lid to the container when the container, with the lid already coupled (and thus with the pin extended), is connected to the base via the bayonet / screw connection. In this respect, the device is designed such that the sequence of connecting the container to the base and closing the container with the lid is arbitrary. One can first attach the container to the base and then close it with the lid, or one can first close the container with the lid and then couple the container to the base. In both cases, the motor is signaled that the container is closed by the lid.Since the order of the steps is irrelevant, user-friendliness is increased. A bayonet or screw connection is easy for a user to create. In principle, however, a snap-fit ​​connection is also possible. It goes without saying that instead of a downward-extending pin, another mechanical mechanism can be used to detect the lid, such as an upward-moving, pivoting, or rotating element.

[0053] According to the invention, the transmission element is coupled to a coupling element. This coupling element is pivotably mounted within the base and interacts with the transmission element to assist in detecting the coupling of the lid to the container, in particular to transmit the movement of the transmission element to the magnet. This allows the distance between the transmission element and the motor to be increased, thus increasing the design flexibility.

[0054] Preferably, the motor has a coupling detection device to detect coupling between the motor and the base. When coupling between the motor and the base is detected, the motor can be operated in different modes than in a state where no coupling is detected. This design requires that the motor be detachably coupled to the base. As mentioned above, this leads to increased operational safety combined with greater flexibility in the use of the motor, which, for example, can be operated differently in a coupled state than in a hand-held state. The features of the coupling detection device can be those described above.

[0055] It is preferred that the motor can be operated when coupling with the base is detected, without requiring a user to continuously operate any actuator on the motor or handpiece. This coupling detection can be achieved, for example, by a second magnet located on the base and detected by a sensing device on the motor / handpiece. This increases the flexibility of use, as the motor can be operated without requiring a user to be present at the device or otherwise continuously operate it. Simultaneously, safety is enhanced by making this mode possible only when the motor is coupled with the base. Furthermore, when coupling with the base is detected, the motor can only be operated if it is simultaneously detected that the lid of the connected container is closed.This eliminates the possibility of the user coming into contact with the rotating device used to process the food.

[0056] Preferably, the handle is the handle of a stick blender and / or hand mixer, or generally of a handheld kitchen appliance. This increases application flexibility.

[0057] Preferably, the base has no electrical components. This simplifies its manufacture and reduces the requirements for water resistance, thus enabling more cost-effective production. The device is preferably operated exclusively via controls on the handpiece. This allows for a simpler base design. Furthermore, user-friendliness is increased, as users are already familiar with the operation and control of the handpiece via its controls, provided they have previously used the handpiece for other purposes.

[0058] Preferably, the handpiece can be coupled to the base in at least two orientations. This facilitates adaptation to a user's preferences and whether they are right- or left-handed.

[0059] Brief description of the characters

[0060] Figure 1 shows a kitchen appliance according to a first embodiment of the invention.

[0061] Figure 2 shows one component of Figure 1.

[0062] Figures 3-5 show a drive train according to the first embodiment of the invention.

[0063] Figure 6 shows an exploded view of a handpiece according to the first embodiment of the invention.

[0064] Figure 7 shows a handpiece coupling of the handpiece according to the first embodiment of the invention.

[0065] Figure 7a shows a coupling at the base according to the first embodiment of the invention.

[0066] Figure 8 shows a section through a base according to a second embodiment of the invention. Figure 9 shows a handpiece according to a second embodiment of the invention.

[0067] Figure 10 shows a partial sectional view of components of the first embodiment of the invention.

[0068] Figures lOa-lOb show components of the first embodiment of the invention.

[0069] Figure 11 shows a sectional view through a kitchen appliance according to the first embodiment of the invention.

[0070] Figure 12 shows a sectional view through a kitchen appliance according to a third embodiment of the invention.

[0071] Figure 13 shows a handpiece according to a fourth embodiment of the invention.

[0072] Detailed description of the figures

[0073] Figure 1 shows an overall view of a kitchen appliance according to a first embodiment of the invention. A drive coupling 101 is provided on a base 100, to which a handpiece 104 is detachably coupled. This handpiece 104 is preferably the handpiece of a hand blender and can therefore also be used to drive a hand blender attachment, a whisk, or other known hand blender accessories. This handpiece 104 has a control unit on its upper surface 106 for controlling the handpiece 104.

[0074] Adjacent to the drive coupling 101 is a vessel coupling 102, to which a vessel 107 is detachably attached. This vessel 107 is closed by a lid 108, which has a feed tube 110 for feeding food. Inside the vessel 107 is a food processing device (not shown), which is driven by the handpiece 104 and a gearbox provided in the base 100, which will be described in detail later. The vessel 107 also has a handle 109 to detach the vessel 107 from the base 100 and to facilitate handling. The gearbox arranged in the base 100 reduces the rotational speed of the handpiece 104 and increases the torque.

[0075] The handpiece 104 has a main control knob 105 on one side, which controls the activation and / or speed of the motor of the handpiece 104. It also has a user interface 106' on the top of the motor unit, which includes a display and buttons for controlling additional functions. Although a cylindrical container 107 and a lid 108 with a feed tube 110 are shown here, other shapes of containers and lids can also be used. For example, a smaller container for processing food with a completely closed lid, a mixing container, a juicing device, or similar items can be used, which can be operated via a rotary drive. In general, all accessories already known to those skilled in the art from food processors or stand mixers and which have a bottom drive can be used.Although buttons are mentioned in the present embodiment for controlling the device, these are merely examples of possible actuating means. Instead of buttons, touch panels, rotary knobs, toggle switches, etc., can also be used.

[0076] Figure 2 shows the base 100 of Figure 1 in further detail. It can also be seen that a locking opening 103 is provided directly adjacent to the vessel coupling 102, through which the presence or absence of a lid 108 is communicated to the handpiece 104. This function will be described in detail later.

[0077] Figures 3-5 show a detailed view of a gearbox or transmission system 200 located within the base 100. The transmission system 200 includes a belt 201, which is driven by an input pulley 203. This input pulley 203 is driven by a handpiece coupling 202, which is in turn driven by the handpiece 104. The torque is then transmitted to the belt 201, which is spaced apart from a main component 200a of the transmission system 200 by two metal tabs 205. These tabs have minimal manufacturing tolerances and thus precisely position the belt 201 and also provide pretension. Therefore, no separate belt tensioning device is required.

[0078] Figure 5 shows the interior of the main part 200a of the transmission device 200 in further detail. The belt 201 drives the output pulley 201a, which is preferably integrally coupled to a first transmission gear 201b, which has a larger diameter. This, in turn, engages with a second transmission gear 201c, which is fixedly provided with a shaft 210a, and which engages with a third transmission gear 201d. This third transmission gear 201d is preferably integrally formed with a fourth transmission gear 209. The fourth gear 209 engages with a fifth tooth 208, enabling it to rotate the latter.

[0079] The fifth transmission gear 208 is arranged coaxially with the second transmission gear 201c and, in particular, has the same axis 210a. However, it is not rigidly connected to the second transmission gear 201c and can therefore rotate at a different speed. The fifth transmission gear 208 also has an internal coupling 208a, which is provided for coupling with a food processing device. A bearing ring 207 is provided radially outside the internal coupling 208a, by means of which it is supported on the housing of the main part 200a. It is also possible to integrate the second transmission gear 201c with the output pulley 201a, which would result in a reversal of the direction of rotation of the subsequent gears. The first transmission gear 201b would thus be omitted.

[0080] An external coupling 206 is rigidly connected to the second transmission gear 201c (via shaft 210a) and thus rotates at the same speed as the second transmission gear 201c. The external coupling 206 therefore has a different angular velocity than the internal coupling 208a, enabling the food processing device to be driven at two different speeds: via the internal coupling 208a and the external coupling 206. Different food processing devices can thus engage either coupling 206 or 208a, depending on the torque and speed requirements. The gearbox of the transmission device 200 reduces the rotational speed of the handpiece while simultaneously increasing the torque. Furthermore, the use of the belt 201 enables power transmission over a certain distance, with the belt 201 also providing a first gear reduction stage.The first stage of the transmission is the belt 201, which runs between the handpiece coupling 202 of the handpiece and the main part 200a, thus bridging almost the entire distance to the vessel coupling 102. The outer coupling 206 and the inner coupling 208a are exposed towards the vessel 107 and allow coupling with food processing equipment located within it. The outer coupling 206 is smaller than the inner coupling 208a (which may also have an outer coupling surface). The fifth gear 208 with the inner coupling 208a is mounted on the axis 201a of the second gear 201c via a bearing 211 (see Figure 4) and is thus arranged coaxially and rotatably relative to it.

[0081] The smaller diameter of the fourth transmission gear 209 compared to the fifth transmission gear 208, and the smaller diameter of the second transmission gear compared to the third transmission gear 201d, reduce the rotational speed and increase the torque. This results in a lower rotational speed for the inner coupling 208a than for the outer coupling 206. In this case, the second transmission gear 201b has the same diameter as the first transmission gear 201a, thus reversing the direction of rotation. It should also be noted that the axles / shafts of the input pulley, the output pulley 201a, and the first transmission gear 201b are made of metal and are not actively tensioned, for example, using a tensioning pulley, in order to keep the complexity of the arrangement low.

[0082] Figure 6 is an exploded view of a handpiece 104 for use in the first embodiment.

[0083] A housing 320 contains a motor 302, which can be controlled via a first circuit board 301. The motor includes an output coupling 322, through which accessories can be driven. An adapter 306 is provided on the output side of the housing 320, which serves to connect the handpiece 104 to accessories. The adapter 306 has recesses 307 that engage with corresponding projections in the drive coupling 101 of the base 100. The control circuit 301 is connected via a connector 304 to a second circuit board 305, which contains Hall sensors 305a and is located in the adapter 306. The Hall sensors 305a are arranged directly behind the recesses 307. This is also shown in more detail in Figure 7. The second circuit board 305 is provided with one or more Hall sensors 305a, preferably with two of these sensors being provided.The second circuit board 305 is designed as a flexible circuit board, which is positioned between the adapter 306 and the output coupling 322 of the motor 302. Alternatively, the second circuit board 305 can also consist of one or more interconnected rigid circuit boards.

[0084] The connection 304 between the second circuit board 305 and the first circuit board 301 can preferably be a flexible circuit board, as this can be easily routed between the motor 302 and the outer wall of the housing 320 without requiring much space. It can also be shaped as needed, which facilitates assembly. However, it is also possible to use other types of connection, such as flat cables. If a flexible circuit board is used for the second circuit board 305, the connector 304 and the second circuit board 305 can be combined into a single component.

[0085] The Hall sensors 305a can detect the presence and orientation of a magnetic field. For this purpose, a permanent magnet is used, as will be described in detail later, which is located in the base 102 of the kitchen appliance. The Hall sensors 305a are connected to the first circuit board 301 of the handpiece 104 to detect whether the handpiece 104 is attached to the base unit 100. Such attachment is detected as soon as the magnet is within the detection range of the Hall sensor 305a, i.e., when a defined or fixed threshold value for the magnetic field strength is exceeded, and the control electronics thus recognize that a magnet, and therefore the base 100, is present. As soon as the handpiece 104 is removed, the Hall sensors 305a determine the absence of the magnetic field, i.e., when the measured field strength falls below the threshold value, so that it is determined that the base 100 is no longer present.This would then mean, for example, that the handpiece 104 could not be operated without continuously actuating an actuator. To reduce the distance between the Hall sensors 305a and the magnet, there are recesses 307 in the adapter 306 in the area where the Hall sensors 305 are located.

[0086] Figure 7a shows a sectional view through the drive coupling 101. A first rib 308 is shown, extending towards the inside of the drive coupling 101. The magnet is fixedly arranged inside the rib 308, which projects inwards and thus towards the handpiece 104. The arrangement of the rib 308 corresponds to the location of the recess 307; that is, when the handpiece 104 is connected to the base 100, the rib 308 engages in the recess 307 to reduce the distance between the magnet and the Hall sensor 305a.

[0087] Two recesses 307 are provided, spaced 180° apart, so that the handpiece 104 can be attached in two orientations rotated by 180°. This allows the user to choose the most convenient attachment, depending on whether the user is left-handed or right-handed. In Figure 1, the handpiece is shown on the right side of the base 100, which is better for right-handed users. A left-handed user can rotate the base 100 by 180° to have the handpiece 104 on the left side, but this requires the handpiece 104 to be rotated 180° relative to the base 100.

[0088] The rib 308 also serves as a blocking feature to prevent other handpieces 104, which do not have the base recognition feature, from being used with the base. These handpieces have essentially the same connection geometry, but lack the recesses 307 and therefore cannot be used with the base 100. On the other hand, compatibility is ensured in that handpieces 104 with base recognition (i.e., with the recesses 307) and handpieces without base recognition (i.e., without recesses 307) can use all other attachments together, such as immersion blender attachments, whisks, or small chopping attachments, which reduces costs and leads to greater flexibility.

[0089] Figures 10-11 describe in detail a procedure to ensure that the kitchen appliance according to the first embodiment is only used with the lid 108 closed.

[0090] Figure 10 shows a partial sectional view through the base 100 with the handpiece 104 attached to it. A transmission rod 402 (coupling element) with two curved sections 422, 423 at opposite ends is pivotably mounted within the base 100. The first end of the transmission rod 402 is located below the locking opening 103. Below this locking opening 103 is a transmission element 401 in the form of a lever, pivotably mounted about an axis 425. This transmission element 401 has an opening 421 on one side into which the curved section 422 of the transmission rod 402 engages. An edge 424 is provided on the side of the transmission element 401 opposite the opening 421, which is inclined relative to a second part 426 of the transmission element 401.A pin 407, which will be described in more detail later, can act on this edge 424 and thus pivot the transmission rod 402 about its axis 425.

[0091] At the other end of the transmission rod 402, a magnet 403 is provided, which can be moved up and down within a guide (not shown) so that it can move up and down within the second, hollow rib 308, which is opposite the first rib 308 shown in Figure 7a. The magnet 403 is biased in one direction out of the rib 308 by a spring (not shown).

[0092] When the magnet 403 is moved upwards in this second rib 308, its presence can be detected by a Hall sensor 305a in the handpiece 104. Therefore, when the pin 407 acts on the transmission element 401, and in particular on the edge 424, this causes the magnet 403 to move upwards, so that the Hall sensor 305a detects the presence of a magnetic field. As will be described in more detail later, this ensures that the presence of a cover 108 can be reliably detected.

[0093] The manner in which the lid 108 acts on the transmission rod 402 is shown in Figure 11. A lid 108 is provided on a vessel 107. Simultaneously, a transmission rod 405 is provided within the handle 109 of the vessel 107. This rod is, for example, supported by a spring and is biased upwards. A pin 407 is located at the lower end of the transmission rod 405. When a projection 406 of the lid 108 acts on the transmission rod 405, the transmission rod 405 is pressed downwards, so that the pin 407 protrudes downwards from the vessel 107. In this state, the pin 407 presses against the edge 424 of the transmission element 401 and thus, as mentioned above, moves the magnet 403 upwards. Thus, this condition, which corresponds to a vessel 107 sealed by the lid 109, can be detected by the handpiece 104.

[0094] Since the handpiece 104 has two Hall sensors 305a, one of which is provided in each recess 307, the Hall sensors 305a do not differentiate between the magnet that is fixedly located within the first rib 308 in the drive coupling 101 and serves to detect the coupling with the base, and the magnet 403 that is movably arranged within the second rib 308 and serves to transmit the information that the lid 108 is attached to the vessel 107. The two magnets are located in axially opposite ribs 308, so that it is possible to mount the handpiece rotated by 180°. Therefore, for the function of the handpiece, it is only relevant whether no magnets, one magnet, or two magnets are detected.

[0095] If no magnet is detected, no base 100 is provided on the handpiece 104, so the handpiece 104 cannot be operated in hands-free mode. In other words, it only operates as long as an actuating device is engaged. This is the standard configuration in which the handpiece 104 can be operated in the usual way with handheld accessories, such as a stick blender attachment.

[0096] When a single magnet is detected, the handpiece 104 determines that the base 100 is present and coupled to the handpiece 104, but that the lid 108 is missing or that no vessel 107 is attached to the base 100. In such a state, the handpiece 104 is programmed so that the motor cannot be operated. The user interface can display a corresponding symbol so that a user recognizes that the motor cannot currently be started.

[0097] However, if two magnets are detected, the handpiece 104 determines that it is coupled to a base 100 and that the lid 108 is also attached and the vessel 107 is attached to the base 100. Now the motor 302 of the handpiece 104 can be operated both in a hands-free mode and in a mode in which operation is only possible while an actuating element is being pressed.

[0098] In principle, it is also possible to differentiate between different vessels 107 using this system. For example, the Hall sensors 305a could be bipolar Hall sensors capable of distinguishing between the magnetic north and south poles. It would then be possible to use two parallel mechanical connections. Each of these connections would be activated via the aforementioned locking opening 103. Some of the vessels could use the first connection, while others use the second. The two magnets 403 would be arranged directly adjacent to each other in the same channel of the second rib 308 of the drive coupling 101. Each pin would have a magnet coupled to it with a different polarity, so that either the north pole or the south pole points upwards.In this way, the motor unit 104 could determine which container 107 is attached and adjust the programs or presets accordingly, for example to preset a slower speed for a kitchen appliance intended for kneading dough than for a kitchen appliance intended for chopping food.

[0099] This design uses the same principle for base and lid detection, which is cost-effective and allows for a 180° rotatable handpiece 104. It also avoids disengaging the gearbox, which, as previously mentioned, is advantageous for the device's lifespan. Another advantage is that no electronics are required in the base 100; the safety feature is entirely mechanical. Furthermore, no electrical contacts are used between the base 100 and the handpiece 104, which are prone to damage, corrosion, or contamination and are therefore unreliable. Complex electronics with galvanic isolation are also unnecessary, as there are no electrical connections to the outside of the handpiece 104.

[0100] Figures 8 and 9 show another way of providing such a locking mechanism and thus represent a second embodiment of the invention.

[0101] Figure 8 shows a section through a base 100' according to a second embodiment of the invention. Here, the handpiece 104' has one or more LEDs 505 or other types of light source on a circuit board, and a receiver element (not shown) opposite them. When the handpiece 104' is coupled to a drive coupling 101' on the base 100', the light from the LEDs 505 enters the openings of corresponding light guides 503, 504 provided in the drive coupling 101'. The ends of these light guides are adjacent to the end surfaces of the LEDs 505 and the end surfaces of the receiver element of the handpiece 104', so that light can be transmitted from the LED in the handpiece 104' to the light guides 503, 504 and back to the receiver element in the handpiece 104'.

[0102] The optical fibers 503 and 504 within the base 100 ' essentially form a loop, which is, however, interrupted at a point 502. A blocking pin 501 can be inserted through this point 502, preventing light transmission from the first to the second optical fiber 503 and 504, or vice versa. This pin 501 can be moved by the pin 407 of the vessel 107. Thus, interrupting the light transmission via the optical fibers 503 and 504 can signal the attachment of the lid 108 to the vessel 107. However, it is also possible to insert a transparent colored material into the light beam instead of a blocking pin 501 to transmit a color as signal information. It is also possible to insert polarizing filters into the light beam, either as an alternative or in addition to the color filters, to transmit further information. Therefore, it would be possible to transmit more than just a binary signal.

[0103] Inside the drive coupling 101', the first and second light guides 503, 504 are open and have a flat, polished surface to transmit the signal from the handpiece 104' to the base 100' and vice versa. The first and second light guides 503, 504 can be made of transparent plastic or glass fibers for cost-effectiveness. Base detection can also be performed in the same way, which is advantageous because the same technology is used for both. To enable base detection, a second group consisting of a light source and a receiver element, as well as a second light transmission loop, would need to be added. This second loop, however, is permanently closed and thus transmits the light back to the handpiece as soon as the handpiece 104 is connected to the base 100. It is not necessary to interrupt the loop of the first and second light guides 503, 504 directly beneath the vessel.It would also be possible to make the interruption directly below the drive coupling 101 ', in which case a mechanical transmission similar to that described in relation to the first embodiment would be possible.

[0104] Alternatively, mirrors can be used instead of light guides. In this case, the handpiece would have two opposing groups of LEDs / light sources and light-receiving diodes, while the input coupling at the base would have two mirrors in corresponding positions. One of these mirrors would be fixed for base detection, while the other could be moved by a mechanical connection when the cover is attached.

[0105] Alternatively, a locking mechanism could be implemented using near-field communication (NFC). In this case, the container, lid, or base would contain a resonant circuit with a capacitor and an inductor that can be mechanically manipulated. To detect whether the container is closed by a lid, there would either be a circuit that short-circuits the capacitor or a magnet that influences the inductor of the circuit. It is also possible to completely shield the resonant circuit. This could be achieved by sliding a piece of metal over it, partially surrounding it. Additionally, these electronic components would be designed so that the lid and container are at least partially dishwasher-safe.This could be achieved by either hermetically sealing the electronic components in a part of the container or the lid, or by protecting the components themselves with a waterproof resin. If the resonant circuit is located in the base, a waterproof design is unnecessary.

[0106] The mechanism for closing the switch and moving the magnet and / or shield is integrated either into the lid or the container. In both cases, the initial movement of the mechanism originates from the lid, which is attached to the container when it is closed. This movement can be initiated by the lid itself or by moving a rod near the container, for example, in the handle. It is also possible for such a modification of the resonant circuit to be achieved by fixing the container to the base. This prevents the motor from running when the lid is attached to the container but the container is not securely fastened to the base.

[0107] In the motor unit and the handpiece, a coil antenna is located adjacent to the adapter and therefore directly next to the base. This antenna transmits a signal and receives a resonant signal, which is used to detect the nearby resonant circuit. The antenna itself can be implemented using a rigid or flexible circuit board, as described above for the Hall sensors. It is integrated within the motor unit in such a way that it is essentially protected from external influences.

[0108] A microcontroller on the circuit board sends a signal via an amplification circuit to this antenna, which excites the adjacent resonant circuit. This resonant circuit then emits a signal with a resonant frequency determined by the capacitor and the inductor. The signal from the handset antenna is regularly interrupted, so there is always a transmit period followed by a receive period.

[0109] When the resonating circuit "responds" to the signal from the handpiece, the lid is considered closed, and the vessel is also assumed to be attached to the base. As long as this is the case, the device can be operated. If the mechanism is triggered by opening the lid or removing the vessel, and the resonating circuit is thus deactivated, disrupted, or shielded, no signal can be sent back, or the signal sent back will no longer have the defined resonant frequency. Therefore, unless there is interaction with the resonating circuit, the system will interpret this as an open or missing vessel and block motor operation.

[0110] A further embodiment, in a third embodiment, is shown in Figure 12. Here, one or more LEDs / light sources and photodiodes are provided on a fixed circuit board or a flexible circuit board 704 inside the handpiece 104'' in the area of ​​the adapter where the handpiece 104 is covered by the drive coupling when it is connected to the base 100''. If, as is preferred, two of these LEDs / light sources and photodiodes (as examples of light sensors) are provided, they are arranged offset by 180°. The LEDs / light sources and the photodiodes point outwards from the handpiece 104. At the same time, holes or a transparent or infrared-transparent material are also provided in the material of the housing of the handpiece 104 ' ' and in the base 100 ' at a location 703 to provide a free field for the light source and the photodiodes (as an example of a light receiving device).This could be achieved, for example, through an opening, since the base 100'' does not need to be watertight in this case. When the container 107'' is firmly attached to the base 100'' and secured in its final position via the bayonet / screw connection, there is a point where the container 107'' faces the handpiece 104''. At this point, a mechanism is provided that is designed to press downwards a rod 701, which is spring-loaded and located inside the cover 705 on the outside of the container 107''. This rod 701 is pressed downwards from above by a small hook with a ramp geometry 706 on the lid 108'' when the lid 108'' is attached to the top of the container 107''. The spring causes the rod 701 to move upwards if the cover 108'' is not attached.Even though a linear movement of the rod 701 is assumed here, it is also possible to use a rotary movement.

[0111] On the underside of the rod cover, at the same height as the LEDs in the handpiece 104'', there is a small opening in the cover to expose the rod 701 underneath. A reflective element 702 or a sticker is provided on the rod 701 at this point, so that when the cover 108'' is attached to the container 107'', the rod 701 directs this reflective element 702 into the light beam from the LEDs. In this state, the photodiode receives the reflected light from the LED. This signal is then transmitted to the control circuit to start the motor. If the cover 108'' is not closed, the reflective element 702 is not exposed and therefore not visible from the LEDs, so no light is reflected. In this case, the motor cannot be started.

[0112] Since the sensors and LEDs are provided on both sides of the handpiece 104'', it is possible to attach the handpiece 104'' to the base 100'' in two orientations rotated by 180°. This is advantageous because it provides a kitchen appliance that is comfortable to use regardless of whether the user is right- or left-handed. A suitable design ensures that the motor can only be operated when the container 107'' is correctly positioned and the lid 108'' is attached. The opposite LED and photodiode can be used for base detection in the same way. For this purpose, a fixed reflective element can be attached to the inside of the drive coupling of the base 100'', which reflects the light emitted by the LED in the same way as soon as the handpiece 104'' is connected to the base 100''.

[0113] Another solution, which is not according to the invention, would be to disengage the transmission string within the base from the motor and / or the drive for the food processing device when the lid is open. This would require a clutch actuated by the container lid. Alternatively, it would be possible to block the string while the lid is open. This would prevent the food processing device from operating while the lid is open, but would require a safety device for the motor to prevent it from overheating and being damaged in the blocked state. A slip clutch might therefore be needed to prevent the handpiece from locking up.This would have the advantage that, if the user closes the lid after switching on the handpiece, the slip clutch would couple the handpiece to the drive transmission more smoothly, thus preventing damage to the gearbox. The slip clutch could be implemented in a manner known to those skilled in the art, for example, by disengaging a transmission element against a spring force, a magnetic transmission, or a slipping drive belt. Alternatively, instead of the slip clutch, the motor control in the handpiece could detect the motor's blocked state and automatically either reduce the current or switch off the motor. Another idea is to use a manual locking mechanism. This could be a button or lever located on the base or the vessel that must be manually operated by the user. When the locking mechanism is in the open position, the vessel lid can be removed.Simultaneously, the mechanism prevents the food processing unit from operating. This can be achieved by mechanically disengaging the drive train or by blocking the drive train in the base, as described above. It could also be done electronically by preventing the motor from running. Any of the concepts described above could be used for this purpose.

[0114] For example, the locking mechanism could move a magnet that can be detected by the handpiece 104. When the locking mechanism is in the open position, the magnet would be moved away from the motor unit, preventing it from operating. Simultaneously, the locking mechanism would remain fixed in the open position as long as the lid is not attached. Only when the lid is attached to the vessel can the user move the locking mechanism to the closed position. In this position, the locking mechanism connects the drive train (or releases the drive train's blockage, or electronically enables the motor to operate). At the same time, the locking mechanism locks the lid in the closed position. Thus, when the locking mechanism is in the closed position, it is not possible to remove the lid.To remove the lid, a user would first have to move the locking mechanism to the open position, which would simultaneously stop the food processing unit. This arrangement has the advantage that the lid is locked in the closed position and cannot be opened while the unit is running. Opening the lid while the unit is running requires adhering to a maximum stopping time, which can be challenging depending on the unit's weight. The improvement over the prior art is that the user no longer needs to remove the handle each time to briefly open the lid, but simply needs to operate a lever or button.

[0115] Although Hall effect sensors for detecting magnetic fields were mentioned earlier, it is also possible to use reed switches instead or in addition to them. A reed switch is an electronic component that closes a switch when exposed to a magnetic field. It is also possible to use inductive or capacitive sensors in the handpiece that detect a metal part in the base instead of a magnet. In addition to these contactless solutions, it would also be possible to use a pin or protrusion in the base that actuates an integrated switch in the handpiece as soon as it is attached to the base. Alternatively, there could be open contacts at the bottom of the handpiece that are closed by a metal part or a conductive bridge in the base once the handpiece is attached.Alternatively, the base could include an additional communication circuit to detect whether a container is attached and whether it is properly sealed. This would, however, require a power supply for the base, which could be provided either via a separate power cord or batteries integrated into the base. Another option is to power the base via the handpiece, with the circuit in the base being supplied via contacts or inductively from the handpiece.

[0116] Figure 13 shows the top of a handpiece 601 according to a fourth embodiment of the invention. This handpiece 601 is designed so that its motor can be operated without the user having to continuously press a button ("hands-free mode"). When such a handpiece 601 is used with attachments that can be held by hand, such as a hand blender attachment or a whisk, it is not possible to operate them without user intervention to prevent accidents. However, if the hand blender is used with a base or other accessory, such as a food processor or another type of mixer, where it can be placed and the food processing element is therefore not accessible to a user during operation, such a hands-free mode is possible.

[0117] Figure 13 shows such a handpiece 601, which can be used in a hands-free mode.

[0118] The handpiece 601 has a speed control knob 602 (second operating element) on the front. This speed control knob 602 is used in handheld operation to activate the motor and also to control the motor speed by pressing the knob to varying degrees. Additionally, the hand blender has a user interface on the top, which includes a selection element 603. This element may, for example, have several buttons or a thumbwheel. The selection element allows the user to set programs, the speed for hands-free mode, and a timer. The interface also has a display 604 that shows the user various operating parameters, such as the selected programs, the chosen speed, or the timer.Alternatively, the speed knob can also function only as an on / off switch, and the speed setting for handheld operation can be adjusted via the selection device 603 or an additional setting device not shown here. The display can be a seven-segment display, LEDs, illuminated symbols, or a pixel display. Additionally, the interface includes one or more buttons 606 for further functions or to navigate the options available to the user. The handpiece also features a hands-free button 605 (first actuating device) that can be used to start or stop the handpiece in hands-free mode. Thus, when hands-free mode is available and the handpiece 601 is connected to a base, the user can start the motor using the hands-free button 605.The motor will then run without further user intervention until any set program is completed, until a user-defined time has elapsed, or until a maximum processing time specified by the manufacturer has expired. However, the user can press the hands-free button 605 again at any time to stop the motor. Alternatively, there may be separate buttons / actuators for starting and stopping the motor. The motor speed can also be changed during operation using the selection device 603. In hands-free mode, the handpiece 601 uses a software-controlled relay to start the handpiece 601 and operate it for a specified duration according to the user's wishes.

[0119] Alternatively, the user can also operate the motor by pressing the speed button 602 after pairing the handpiece 601 with the base. However, in this case, the motor would only operate as long as the user presses the speed button 602, unlike in hands-free mode. This function can be used for recipes that only require a short time for chopping and / or other food processing. Although buttons are mentioned here, it should be understood that the described functions can also be implemented in other ways, for example, as touch-sensitive surfaces or buttons on a touch display.

[0120] The logic for evaluating the sensor data according to the present invention is described below. In all embodiments, there are two sensors, A and B, in the handpiece, for which a corresponding input is provided by the base. One sensor signal indicates the presence of the base on the motor unit, while the other sensor signal indicates that the lid of the container is closed (or that a container with a closed lid is present on the base). Since the base and the handpiece can be configured in two orientations relative to each other, both sensors must be able to perform both functions. As an additional input for base operation, there is a speed control button 602 and a hands-free button 605 on the handpiece 601. This is summarized in the table below. Speed ​​Inputs / Mode Hall Sensor A Hall Sensor B Button Hands-free button Handheld

[0121] (manual 0 0 1

[0122] Operation)

[0123] Basic mode

[0124] (blocked - 1 0

[0125] (Lid open)

[0126] Basic mode

[0127] (blocked - 0 1

[0128] (Lid open)

[0129] Basic mode

[0130] (hands-free 1 1 0 1 mode)

[0131] Basic mode

[0132] (manual 1 1 1 0

[0133]

[0134] Operation)

[0135] With the aforementioned inputs, there are four different operating modes that are possible:

[0136] In the first, handheld mode, the handle is not attached to the base, no sensor signal is detected, and the handle behaves like that of a conventional hand blender. In this case, the user can press the speed control button 602 to operate the motor. When this button is released, the motor stops immediately. The hands-free button 605 then has no function.

[0137] If, however, the handpiece is attached to the base without the vessel or without the lid attached to the vessel, the handpiece detects a sensor signal indicating the presence of the base. Since operation in this state would be unsafe, neither the speed control button 602 nor the hands-free button 605 has any function, and it is not possible to operate the motor. However, if the handpiece is attached to the base and the vessel is correctly attached to the base with the lid in place, the handpiece receives two sensor signals: one for the attachment of the handpiece to the base and another for the attachment of the lid to the vessel (and the vessel to the base). Only with both sensor signals present is it possible to operate the motor. The user can then press the hands-free button 605 to activate the motor.The motor will run until a user-set time has elapsed, until the maximum allowed processing time has been reached, until a program has expired, or until the user presses the freehand button 605 again to stop the motor.

[0138] In this state, the user can also press speed button 602. The device will then run as long as speed button 602 is pressed. When the user releases speed button 602, the motor stops immediately.

Claims

1. Claims 1. Device for processing foodstuffs with:

3. a motor ( 601 ) designed to drive a food processing device, 4. a control device by which the user can control the motor, 5. wherein the control means comprises a first and a second actuating means (605, 602) which are provided separately from one another and can be actuated alternatively by a user to cause the motor (601) to drive the means for processing food, wherein the device can be operated such that, when the first actuating means (605) is actuated, the motor (601) continues to drive the means for processing food even after the actuating means (605) has ceased.

6. wherein the motor ( 601 ) ceases to drive the food processing device when the second actuating means ( 602) is stopped.

2. Device according to claim 1, wherein the first and the second actuating means ( 605, 602 ) comprise buttons.

3. Device according to claim 1, wherein at least one of the actuating means ( 605, 602 ) is a touch-sensitive button .

4. Device according to one of claims 1 to 3, wherein the second actuating means ( 602 ) is configured to control the speed of the motor ( 601 ).

5. Device according to one of the preceding claims, wherein the device further comprises a display device ( 604 ) to indicate an operating state of the device .

6. Device according to one of the preceding claims, wherein the device includes an adjustable timer which is displayed on the display device ( 604 ).

7. Device according to one of the preceding claims, wherein the first actuating means (605) is configured such that the means for processing food is operated continuously upon a first actuating of the first actuating means (605) and upon a second actuating of the first actuating means (605), which occurs later than the first actuating of the first actuating means (605), the means for processing food is no longer operated.

8. Device according to one of the preceding claims, wherein the device has a means for detecting a coupling with a base (100) which detects whether the device is coupled with a base which enables hands-free operation of the device, and wherein the device is designed such that operation of the motor (601) after actuation of the first actuating means (605) is only possible if a coupling of the device with the base is detected.

9. Device according to Claim 8, wherein the base ( 100) does not contain any operating elements.

10. Device according to one of the preceding claims, wherein different operating modes can be preselected when operating via the first and / or second actuating means ( 602 ).

11. Device according to one of the preceding claims, wherein when operated via the second actuating means ( 602 ) The speed can be controlled via an additional setting element.

12. Device according to one of the preceding claims, wherein preset, automatic program sequences can be accessed during operation via the first actuating means ( 605).

13. Device according to one of claims 7 to 12, if dependent on claim 7, wherein, as an alternative to a second actuation of the first actuating means, the means for processing food can be automatically stopped after the expiry of a program or timer.

14. Device according to one of the preceding claims, wherein the device is a handpiece for a handheld kitchen appliance, preferably a stick blender or hand mixer.

15. Device for processing foodstuffs with:

20. a motor (302 ) for processing foodstuffs, which can be controlled by a user and is provided in a handpiece ( 104 ), and 21. a base ( 100) which can be detachably coupled to the handpiece ( 104 ) (301 ), so that the motor (301 ) can drive a means for processing foodstuffs to be coupled to the base ( 100 ), 22. wherein the device is designed to detect a coupling of the handpiece ( 104 ) with the base ( 100) and wherein the device is designed such that the motor ( 100) can be operated in different operating modes when a coupling of the handpiece ( 104 ) with the base ( 100) is detected than in a state in which no coupling of the handpiece ( 104 ) with the base ( 100) is detected.

16. Device according to claim 15, wherein, upon detected coupling of the handpiece (104) with the base (100), the motor (302) can be operated without a user having to attach a permanently actuated the actuating means provided for the motor (302).

17. Device according to claim 15 or 16, wherein the handpiece (104) has one or more detection devices (305a) and the base has one or more detection features and wherein the device detects the coupling of the handpiece (104) with the base (100) by an interaction of the detection features with the detection devices (305a).

18. Device according to claim 17, wherein the detection of the detection features is carried out without contact.

19. Device according to claim 18, wherein the one or more detection features have magnets and the one or more detection devices (305a) are configured to detect magnetic fields, wherein the one or more detection devices (305a) preferably have Hall sensors and / or reed contacts.

20. Device according to any one of claims 15 to 19, wherein the handpiece ( 104 ) has recesses (307 ) and the base ( 100 ) has projections (308 ) which engage in the recesses (307 ) when the handpiece ( 104 ) is coupled to the base ( 100 ).

21. Device according to one of claims 15-20, wherein the handpiece ( 104 ) can be coupled to the base in at least two orientations.

22. Device according to one of claims 15-21, wherein operation is carried out exclusively via operating elements on the handpiece.

23. Device according to one of claims 15-22, wherein the base does not contain any electrical components.

24. Device according to one of claims 15 to 23, wherein the handpiece ( 104 ) includes a handle and can also be used as a drive for handheld food processing equipment.

25. Device according to one of claims 15 to 24, wherein the handpiece ( 104 ) is the handpiece of a handheld household appliance, preferably a stick blender or hand mixer .

26. Device according to one of claims 17 to 25, if dependent on claim 17, wherein one of the several detection devices is provided to detect the presence of a lid on a container coupled to the base and to allow operation of the motor coupled to the base only when a lid is coupled to the container.

27. Device according to claim 26, wherein the detection of the presence of a lid is carried out by means of the detection of a magnetic field, wherein preferably, when a lid is present on the container, a magnet is moved in such a way that its magnetic field is detected by one of the several detection devices in order to thus detect the presence of the lid.

28. Device for processing foodstuffs with:

35. of a base ( 100) , 36. a container (107) provided at the base (100) and designed for the processing of foodstuffs in the container (107) via a food processing means, the container further comprising a lid (108) which can be detachably coupled to the container (107) in order to close the container (107), 37. a motor ( 302 ) provided in a handpiece ( 104 ) which is detachably coupled to the base ( 100 ), wherein the motor ( 302 ) is provided to drive the means for processing foodstuffs, 38. wherein the device includes a device which enables the operation of the handpiece (104) coupled to the base only when the lid (108) is coupled to the container (107). 39.

29. Device according to claim 28, wherein the handpiece has a detection device which detects a magnetic field in order to detect a coupling of the lid (108) with the container (107), wherein the device preferably has a Hall sensor or a reed contact. 40.

30. Device according to claim 29, wherein the base (100) has a first magnet (403) which is movably arranged within the base (100), wherein the base (100) is configured to move the first magnet (403) within the base (100) due to the coupling of the lid (108) with the container (107) such that the magnetic field at the detection device changes in order to detect the coupling of the lid (108) with the container (107). 41.

31. Device according to claim 30, 42. wherein the container has a pin (407) which is moved, preferably extends, rotates, is displaced or pivoted when the container (107) is closed by the lid (108), 43. wherein the base has a transmission element (401) on which the moving pin (402) acts to move the first magnet such that the detection device detects a coupling of the lid (108) with the container (107).

32. Device according to claim 31, wherein the container (107) can be coupled to the base (100) via a bayonet connection or screw connection and wherein the transmission element (401) moves the first magnet such that the detection device detects a coupling of the lid (108) with the container (107) when the container (107) with the lid (108) already coupled is connected to the base (400) via the bayonet connection or screw connection.

33. Device according to claim 31 or 32, wherein the transmission element (401) is further coupled to a coupling element (402) which is pivotably mounted within the base (100) and interacts with the transmission element (401) to contribute to the detection of the coupling of the lid with the container.

34. Device according to one of claims 28 to 33, wherein the handpiece (104) has a coupling detection device to detect a coupling of the handpiece (104) with the base (100), and wherein the motor can be operated in different operating modes when a coupling of the handpiece (104) with the base (100) is detected than in a state in which no coupling of the handpiece (104) with the base (100) is detected.

35. Device according to claim 34, wherein the motor can be operated when the coupling of the handpiece (104) with the base (100) is detected, without a user continuously operating an actuating means provided on the handpiece (104).

36. Device according to one of claims 28 to 35, wherein the handpiece is the handpiece of a handheld kitchen appliance, preferably a stick blender or hand mixer.

37. Device according to any one of claims 28 to 36, wherein the base has no electrical components.

38. Device according to one of claims 28 to 37, wherein operation is carried out exclusively via operating elements on the handpiece ( 104 ).

39. Device according to one of claims 28 to 38, wherein the handpiece ( 104 ) can be coupled to the base ( 100) in at least two orientations.

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