Cooking preparation household appliance and system with intermediate transmission wheel between two tool couplings

Abstract

The invention relates to a cooking preparation household appliance having a first drive planetary gear (28.1) comprising a first coupling for a first working tool and a first drive gear (32.1) which cooperates with the inner toothing of a peripheral crown gear (34), a second drive planetary gear (28.2) comprising a second coupling for a second working tool and a second drive gear (32.2), characterized in that the second drive gear (32.2) cooperates indirectly with the first drive gear (32.1) via at least one intermediate transmission wheel (40).

Description

TECHNICAL FIELD

[0001] The present invention relates to the general technical field of cooking preparation household appliances comprising a base designed to receive a work container, such as a bowl, and comprising a head integral with the base, the head comprising a planetary gear carrier for driving a work tool, the planetary gear carrier being driven in rotation about a central axis by an electric motor. BACKGROUND

[0002] In conventional cooking preparation household appliances of the above type, the planetary gear carrier generally comprises an eccentric coupling which allows driving the work tool above the base in planetary gear motion combining two rotations about two parallel axes. Such appliances can be used with different work tools alternately mounted on the same coupling, these different work tools being adapted to different cooking work. These appliances are often referred to as "automatic pastry processors", although they can generally be used for preparation work other than pastry.

[0003] For example, work tools of the "dough kneader" type are known, generally comprising one or more rigid arms to allow mixing a dough in the work container.

[0004] Work tools of the "whisker" type are also known, generally comprising one or more thin wires which can be used to emulsify a preparation contained in the work container.

[0005] In automatic pastry processors, the planetary gear carrier is generally driven in rotation at a relatively low speed, for example between 40 and 250 revolutions per minute. Lower speeds are very suitable for some cooking work and thus for some work tools dedicated to such work, for example work tools of the "dough kneader" type. However, some cooking work and work tools dedicated to these works require or benefit from higher rotation speeds of the work tools. This is the case, for example, for work tools of the "whisker" type.

[0006] Furthermore, it is known, for example from document GB2453546, to design a cooking preparation household appliance capable of driving two different types of work tools. The appliance comprises:

[0007] a base having a receiving area configured to receive a work container;

[0008] a head connected to the base, the head having a planetary gear carrier driven in rotation about a central axis by an electric motor and carrying:

[0009] a first drive planetary gear mounted so as to be free to rotate on the planetary gear carrier about a first work axis parallel to the central axis and eccentric with respect to the central axis, the first drive planetary gear comprising:

[0010] a first coupling configured to allow coupling and uncoupling of a first working tool and to ensure that the first working tool is driven in rotation relative to the planet carrier about a first working axis, the first coupling being arranged opposite the receiving area;

[0011] a first drive pinion having as its axis the first working axis, said first drive pinion being integral in rotation with the first drive planet gears and cooperating with the internal toothing of a peripheral crown gear having as its axis of symmetry the central axis, so as to cause the first drive planet gears to rotate about the first working axis during differential rotation of the planet carrier relative to the peripheral crown gear;

[0012] second drive planet gears separate from the first drive planet gears and mounted so as to be free to rotate on the planet carrier about a second working axis parallel to and eccentric relative to the central axis, while the first working axis is separate, said second drive planet gears comprising:

[0013] a second coupling configured to allow coupling and uncoupling of a second working tool and to ensure that the second working tool is driven in rotation relative to the planet carrier about a second working axis, the second coupling being arranged opposite the receiving area;

[0014] a second drive pinion having as its axis the second working axis and being integral in rotation with the second drive planet gears.

[0015] In this example, the second drive pinion meshes with a second peripheral crown gear having as its axis of symmetry the central axis, so as to drive the second drive planet gears to rotate about the second working axis.

[0016] The two crown gears overlap in the direction of the central axis, one of the crown gears having bevel teeth, which are complex to produce and result in a large volume in the direction of the central axis. SUMMARY

[0017] The aim of the present invention is to propose a cooking-preparation household appliance, proposing a first working tool coupling and a second working tool coupling that rotate, while maintaining a simple, economical construction and without requiring major modifications to the architecture of existing appliances.

[0018] To this end, the present invention proposes a cooking-preparation household appliance comprising:

[0019] a base having a base with a receiving area configured to receive a working container;

[0020] a head connected to the base, the head having a planet carrier driven in rotation about a central axis by an electric motor and carrying:

[0021] a first drive planet gear mounted to be free to rotate on the planet carrier about a first working axis, the first working axis being parallel to the central axis and eccentric with respect to the central axis, the first drive planet gear comprising:

[0022] a first coupling configured to allow coupling and uncoupling of the first working tool and to ensure driving the first working tool in rotation about the first working axis with respect to the planet carrier, the first coupling being arranged opposite the receiving area;

[0023] a first drive gear having the first working axis as an axis and being integral in rotation with the first drive planet gear and cooperating with internal toothing of a peripheral crown gear having the central axis as a symmetry axis, so as to cause the first drive planet gear to rotate about the first working axis during differential rotation of the planet carrier with respect to the peripheral crown gear;

[0024] a second drive planet gear separate from the first drive planet gear and mounted to be free to rotate on the planet carrier about a second working axis, the second working axis being parallel to the central axis and eccentric with respect to the central axis, while being separate from the first working axis, the second drive planet gear comprising:

[0025] a second coupling configured to allow coupling and uncoupling of the second working tool and to ensure driving the second working tool in rotation about the second working axis with respect to the planet carrier, the second coupling being arranged opposite the receiving area;

[0026] a second drive gear having the second working axis as an axis and being integral in rotation with the second drive planet gear.

[0027] The cooking preparation household appliance can be characterized in that the second drive gear is indirectly cooperating with the first drive gear through at least one intermediate transmission wheel mounted free to rotate on the planet carrier, so that the first drive gear drives the second drive gear in rotation and the second drive planet gear in rotation about the second working axis through the at least one intermediate transmission wheel.

[0028] The cooking preparation household appliance can further comprise any of the following features, alone or in combination.

[0029] In certain embodiments, the first drive gear is directly meshing with the peripheral crown gear, without intermediate mechanical elements.

[0030] In certain embodiments, the second drive gear is indirectly cooperating with the first drive gear through a single intermediate transmission wheel mounted free to rotate on the planet carrier, the single intermediate transmission wheel being directly meshing with the first drive gear, while being directly meshing with the second drive gear.

[0031] In certain embodiments, the cooking preparation household appliance comprises a plurality of intermediate transmission wheels arranged in cascade between the first drive gearwheel and the second drive gearwheel, the intermediate transmission wheels being pinions with external toothing, which are mounted free to rotate on a planetary gear carrier.

[0032] The first drive gearwheel and the second drive gearwheel can each have a different number of teeth.

[0033] The second drive gearwheel can have a smaller number of teeth than the first drive gearwheel, so that for a given speed of the planetary gear carrier, the absolute value of the rotational speed of the second drive planetary gearwheel rotating around the second working axis is greater than the absolute value of the rotational speed of the first drive planetary gearwheel around the first working axis.

[0034] In some embodiments, the second drive planetary gearwheel rotates around the second working axis at a rotational speed between 1.1 and 2.0 times the rotational speed of the first drive planetary gearwheel around the first working axis.

[0035] In some embodiments, the peripheral crown gearwheel, the first drive gearwheel, the second drive gearwheel and the intermediate transmission wheels are coplanar.

[0036] In certain embodiments, the second drive planetary gearwheel rotates around the second working axis in the same direction of rotation as the first drive planetary gearwheel around the first working axis.

[0037] The cooking preparation household appliance can be designed so that:

[0038] - the peripheral crown gearwheel has a single internal toothing,

[0039] - the first drive gearwheel is a pinion with a single external toothing directly meshing with the internal toothing of the peripheral crown gearwheel,

[0040] - the intermediate transmission wheels are pinions with a single external toothing directly meshing with the external toothing of the first drive gearwheel, and

[0041] - the second drive gearwheel has an external toothing directly meshing with the external toothing of the intermediate transmission wheels.

[0042] In some embodiments, the first working axis and the second working axis have the same eccentricity with respect to the central axis.

[0043] In some embodiments, the first coupling and the second coupling can each have a first and a second working tool coupling geometry, respectively, which are different from each other.

[0044] The present invention also relates to a cooking preparation household appliance system comprising:

[0045] a cooking preparation household appliance having any of the preceding features;

[0046] a first working tool configured to allow its coupling to a first coupler of the cooking-preparation household electric appliance,

[0047] a second working tool configured to allow its coupling to a second coupler of the cooking-preparation household electric appliance.

[0048] In such a cooking-preparation household electric appliance system, the first working tool can be configured to inhibit its coupling to the second coupler, and / or the second working tool can be configured to inhibit its coupling to the first coupler.

[0049] In such a cooking-preparation household electric appliance system, the first coupler can be configured to inhibit the coupling of the second working tool, and / or the second coupler can be configured to inhibit the coupling of the first working tool.

[0050] Such a cooking-preparation household electric appliance system can be configured to prevent the installation of one working tool to the first coupler while the installation of the other working tool to the second coupler. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a general perspective view of a cooking-preparation household electric appliance in which the present application can be implemented.

[0052] Figure 2 is a partial side view of a cooking-preparation household electric appliance in which the present application can be implemented.

[0053] Figure 3 is a partial perspective view of a part of a cooking-preparation household electric appliance comprising two couplers for two working tools.

[0054] Figure 4 is a perspective view showing a peripheral crown gear and a planetary gear carrier with two driving planetary gears according to an embodiment of the present application.

[0055] Figure 5 is an exploded perspective view showing a planetary gear carrier with two driving planetary gears similar to Figure 4

[0056] Figure 6 is a top view of the elements in Figure 4 DETAILED DESCRIPTION

[0057] Figures 1 to 3 ​​A cooking preparation household appliance system 10 is shown, which on the one hand comprises a cooking preparation household appliance 12, such as an automatic pastry processor, and on the other hand a first working tool 14.1 and a second working tool 14.2, which are designed to be mounted on the cooking preparation household appliance 12 to act on food in a cooking preparation range. In the example below, the first working tool 14.1 is for example a kneading tool, while the second working tool 14.2 is for example a whisk. In general, the first working tool 14.1 and the second working tool 14.2 are two different types of working tools, in particular having different geometries on their working surfaces, which are designed to act on food in the cooking preparation range for which they are designed. The first working tool 14.1 and the second working tool 14.2 can be set to run optimally at different rotational speeds around their working axes.

[0058] The cooking preparation household appliance 12 comprises a base 15, here in the form of a stand, with a substantially horizontal base 16 and legs 18 extending vertically upwards from the base 16. The base 15 is designed to rest on a horizontal work plane. The base 16 comprises a receiving area 17 configured to receive a working container 20, here in the form of a bowl, which is generally removable. The working container 20 is removably mounted on the receiving area 17 of the base 16, for example by means of a bayonet connection. The cooking preparation household appliance 12 further comprises a head 22, which in the present example is hinged to the base 15 about a horizontal axis A0, here at the level of the legs 18. In the case of the head 22 being hinged about a horizontal axis A0, the head 22 can be moved between a raised position (not shown), in which the working container 20 can be easily removed from the base 16, and a working position, which is shown in particular in Figure 1 The concepts of "horizontal", "vertical", "high" and "low", as well as the concepts of orientation derived therefrom, refer to the normal orientation of the cooking preparation household appliance 12 in the operating state when the base 15 is placed on a horizontal work plane, and correspond to the representations in the figures.

[0059] The head 22 of the cooking preparation household appliance 12 has a shape extending in the longitudinal direction (horizontal in the working position), which has a rear longitudinal portion (through which the head 22 is connected to the legs 18 of the base 15), and a front longitudinal portion projecting above the base 16 and the working container 20. The head 22 can enclose an electric motor 30, preferably an electric motor, as shown in Figure 2 The activation and speed of the electric motor can be controlled by control buttons 24, for example provided on the side of the legs 18. The electric motor 30, which is arranged inside the head 22, comprises a motor shaft oriented along a motor axis, which can be horizontal or vertical according to the design. Alternatively, the electric motor 30 can be arranged in particular in the base 15.

[0060] In a manner known per se, the front longitudinal portion of the head 22 comprises a planet carrier 26 comprising means for driving the first working tool 14.1 and even the second working tool 14.2 in planetary motion. To this end, the planet carrier 26 is rotationally movable about a central axis AC. In the example illustrated, the central axis AC is fixed relative to the head 22. According to designs well known to the person skilled in the art, the planet carrier 26 is driven by the motor 30 through a kinematic chain 25. Each of the first working tool 14.1 and the second working tool 14.2 is designed to be mounted on the planet carrier 26 so as to be driven in working motion by the planet carrier 26. In the working position, the first working tool 14.1 or the second working tool 14.2 mounted on the planet carrier 26 engages within the working container 20 so as to act on the food contained in the working container 20.

[0061] In the example illustrated, the planet carrier 26 is implemented in the form of a disc-shaped plate. The planet carrier 26 is mounted integrally on the lower end of a drive shaft 27, the axis of which is the central axis AC. The drive shaft 27 is housed in the head 22 and is guided in rotation about the central axis AC within the head 22. The drive shaft 27 carries a drive wheel 29 which constitutes part of the kinematic chain 25 through which the planet carrier 26 is driven by the motor 30. Here, the drive wheel 29 is arranged in the upper part of the drive shaft 27 which extends, for example, above an internal horizontal wall (not shown) through which the drive shaft 27 of the planet carrier can be guided in rotation.

[0062] The planet carrier 26 carries a first drive planet gear 28.1 which is mounted so as to be free to rotate about a first working axis Al on the planet carrier 26, the first working axis Al being parallel to the central axis AC and being eccentric relative to the central axis AC.

[0063] In the example illustrated, and in particular as shown in Figure 5 The first drive planet gear 28.1 comprises a stem 31.1 which extends along the first working axis Al and is rotationally mounted by the disc-shaped plate forming the planet carrier 26. Thus, the first drive planet gear 28.1 has a lower part which projects below the lower surface of the planet carrier 26 so as to be opposite the receiving area 17, and an upper part which projects above the upper surface of the planet carrier 26. In the example illustrated, the upper part of the first drive planet gear 28.1 thus extends into a protected volume above the planet carrier 26, the upper part of the first drive planet gear 28.1 being able to be considered as being included in the head 22.

[0064] The first driving planetary gear 28.1 includes a first coupling 30.1, which is configured to allow the first working tool 14.1 to be coupled and decoupled with the first driving planetary gear 28.1 in the working configuration and to ensure that the first working tool 14.1 is driven in rotation about the first working axis A1 relative to the planetary gear carrier 26. The first coupling 30.1 is arranged opposite the receiving area 17. In the illustrated example, the first coupling 30.1 is arranged at the lower end of the rod 31.1 of the first driving planetary gear 28.1 and is therefore below the planetary gear carrier 26.

[0065] The first drive planetary gear 28.1 also includes a first drive gear 32.1, which rotates integrally with the first drive planetary gear 28.1, centered about the first working axis A1. In this example, this is due to the fact that the first drive gear 32.1 is mounted integrally with the rod 31.1 of the first drive planetary gear 28.1. In a known manner, the first drive gear 32.1 cooperates with the internal gear teeth of the peripheral crown gear 34, which is symmetrical about the central axis AC, to induce the first drive planetary gear 28.1 to rotate about the first working axis A1 during differential rotation of the planetary gear carrier 26 relative to the peripheral crown gear 34.

[0066] In the example shown, the first drive gear 32.1 meshes directly with the inner gear teeth of the peripheral crown gear 34. However, it can be provided that the first drive gear 32.1 cooperates indirectly with the inner gear teeth of the peripheral crown gear 34, for example via an intermediate gear.

[0067] In the example shown, the peripheral crown gear 34 is fixed relative to the head 22, but it can also be provided that the peripheral crown gear 34 is driven in rotation relative to the head 22 about the central axis AC, in particular in a direction opposite to the direction of rotation of the planetary gear carrier 26 about the central axis AC.

[0068] In the illustrated example, the first drive gear 32.1 is carried by the upper portion of the first drive planetary gear 28.1. Thus, the first drive gear 32.1 is arranged above the planetary gear carrier 26, in this case, above the disk-shaped plate. Consequently, the first drive gear 32.1 is housed in a protected volume above the planetary gear carrier 26 and is not visible from the exterior of the food preparation appliance 12.

[0069] In the example shown, the peripheral crown gear 34 is carried by the head 22 and is fixed relative to the head 22. The peripheral crown gear 34 is arranged directly above the planet gear carrier 26, in this case in a protected volume above the planet gear carrier 26. In the example shown, the peripheral crown gear 34 has substantially the same dimensions as the planet gear carrier 26 in a diametrical direction relative to the central axis AC.

[0070] The planet carrier 26 carries a second drive planet gear 28.2, which is separate from the first drive planet gear 28.1. This second drive planet gear 28.2 is also mounted so as to be free to rotate on the planet carrier 26 about a second working axis A2, which is also parallel to the central axis AC and eccentric with respect to the central axis AC. The second working axis A2 is separate from the first working axis A1.

[0071] In the illustrated example, the second drive planet gear 28.2 comprises a stem 31.2 which extends along the second working axis A2 and which is rotationally mounted through a disc-shaped plate forming the planet carrier 26. The second drive planet gear 28.2 thus has a lower part which projects below the lower surface of the planet carrier 26 so as to be opposite the receiving area 17, and an upper part which projects above the upper surface of the planet carrier 26. In the illustrated example, the upper part of the second drive planet gear 28.2 thus extends into the same protected volume as the upper part of the first drive planet gear 28.1, above the planet carrier 26.

[0072] In a similar manner to the first drive planet gear 28.1, the second drive planet gear 28.2 comprises a coupling, here called the second coupling 30.2, which is configured to allow the second working tool 14.2 to be coupled and decoupled from the second drive planet gear 28.2 in the working configuration, and to ensure the driving of the second working tool 14.2 in rotation about the second working axis A2 relative to the planet carrier 26. The second coupling 30.2 is arranged opposite the receiving area 17. In the illustrated example, the second coupling 30.2 is also itself arranged at the lower end of the stem 31.2 of the second drive planet gear 28.2, thus below the planet carrier 26.

[0073] Similarly, the second drive planet gear 28.2 comprises a second drive gear 32.2, which is axisymmetric about the second working axis A2 and integral in rotation with the second drive planet gear 28.2. In this example, this is due to the fact that the second drive gear 32.2 is mounted integrally with the stem 31.2 of the second drive planet gear 28.2.

[0074] According to the application, the second drive gear wheel 32.2 is indirectly coupled with the first drive gear wheel 32.1 by means of an intermediate transmission wheel 40. The intermediate transmission wheel 40 is mounted so as to be free to rotate on the planet carrier 26 about an intermediate axis Al which is parallel to the respective working axes Al and A2 of the first drive gear wheel 32.1 and of the second drive gear wheel 32.2. In this way, the first drive gear wheel 32.1 drives the second drive gear wheel 32.2 and the second drive planet wheel 28.2 about the second working axis A2 in rotation by means of the intermediate transmission wheel 40. Preferably, as in the version shown in the attached figures, the second drive gear wheel 32.2 is indirectly coupled with the first drive gear wheel 32.1 by means of a single intermediate transmission wheel 40 which is a gear wheel with external toothing which is directly meshed with the first drive gear wheel 32.1 and with the second drive gear wheel 32.2. However, it can be proposed that the cooking-preparation household appliance 12 has a plurality of intermediate transmission wheels 40 which are arranged, for example, in cascade between the first drive gear wheel 32.1 and the second drive gear wheel 32.2, the intermediate transmission wheels 40 being gear wheels with external toothing which are mounted so as to be free to rotate on the planet carrier 26. The number of intermediate transmission wheels 40 in cascade is, for example, odd, so that the first drive gear wheel 32.1 and the second drive gear wheel 32.2 are turned in the same direction of rotation about their respective working axes Al, A2.

[0075] For the embodiment with a single intermediate transmission wheel 40, as well as for the embodiment with a plurality of intermediate transmission wheels 40, the intermediate transmission wheel or transmission wheels 40 can be coplanar with each other and with the peripheral crown wheel 34, the first drive gear wheel 32.1 and the second drive gear wheel 32.2. This condition is met if there is a plane perpendicular to the central axis AC which intersects the toothing of each of the peripheral crown wheel 34, the first drive gear wheel 32.1, the second drive gear wheel 32.2 and the intermediate transmission wheel or transmission wheels 40. This allows to obtain a particularly compact cooking-preparation household appliance 12, especially in the direction along the central axis AC. In the sense of the present application, this condition is met if there is a plane perpendicular to the central axis AC which intersects the toothing of each of the peripheral crown wheel 34, the first drive gear wheel 32.1 and the second drive gear wheel 32.2 and of the intermediate transmission wheel or transmission wheels 40.

[0076] In the illustrated exemplary embodiment, the intermediate transmission wheel 40 comprises a single wheel tooth that cooperates with both the first drive gear 32.1 and the second drive gear 32.2. However, it is conceivable that the intermediate transmission wheel(s) 40 comprise a double wheel tooth, i.e. a first wheel tooth and a second wheel tooth that are coaxial but offset on the axis of rotation, so that one of the wheel teeth is driven and the other wheel tooth does the driving. For example, in the case of a single intermediate transmission wheel 40, the first wheel tooth would be driven by the first drive gear 32.1 and the second wheel tooth would drive the second drive gear 32.2. Alternatively or additionally, it is also conceivable that the first drive gear 32.1 has a double wheel tooth, i.e. the first wheel tooth would be driven by the peripheral crown gear 34 and the second wheel tooth would drive the intermediate transmission wheel 40.

[0077] Thus, it is noted that the second drive gear 32.2 does not directly cooperate with the peripheral crown gear 34, as it does not directly mesh with the teeth of the peripheral crown gear 34. This cascading drive allows a simplified construction, in particular allows simplified geometrical tolerances of the parts and assemblies. Indeed, the first drive gear 32.1, the intermediate transmission wheel 40 and the second drive gear 32.2 are carried by the same part, i.e. the planet carrier 26, while each is independently rotatably mounted on the planet carrier 26 from the others. To obtain the chain of dimensions that need to be respected to ensure the cooperation of one being driven by the other is relatively short, and thus can be very easily respected during manufacturing and assembly, without having to take design and implementation measures that are costly to implement. On the other hand, the direct meshing between the peripheral crown gear 34 and the first drive gear 32.1 is more complex to implement, as it involves the planet carrier 26 which is a movable part (rotational movement) both with respect to the peripheral crown gear 34 and with respect to the first drive gear 32.1. Thus, the chain of dimensions to be respected is longer, which means more manufacturing and assembly constraints, and thus inevitably higher production costs. Thus, there is no such longer chain of dimensions in the second drive gear 32.2.

[0078] It is noted that the peripheral crown gear 34, the first drive gear 32.1, the intermediate transmission wheel 40 and the second drive gear 32.2 are all arranged above the planet carrier 26.

[0079] In this example, the first drive gear 32.1 and the second drive gear 32.2 are wheels having a cylindrical geometry about their respective axes Al, A2. As such, they each have a wheel tooth of overall cylindrical geometry about their respective axes Al, A2. Thus, the geometry of the teeth of the peripheral crown gear 34 is also a surface of overall cylindrical geometry, this time about the central axis AC.

[0080] However, other supplementary geometrical shapes can be provided. Thus, it can be proposed that the first drive gear 32.1 and the second drive gear 32.2 are conical geometrical shaped wheels around their respective axes A1, A2, each having conical teeth around their respective axes A1, A2. Moreover, the teeth of the peripheral crown gear 34 and the teeth of the intermediate gear 40 are in this case also conical teeth.

[0081] In the illustrated example, the peripheral crown gear 34 is an annular toothed crown gear having a single inner toothing. In this way, the first drive gear 32.1 is a gear having a single outer toothing which cooperates by direct engagement with the single inner toothing of the peripheral crown gear 34. Finally, the second drive gear also has a single outer toothing which directly engages the single outer toothing of the first drive gear. The toothing of the crown gear or wheel is single in that it is defined by a number of teeth having a unique profile. The single toothing of the crown gear or wheel can have, for example, an annular groove around the axis of said crown gear or said wheel which continuously divides each tooth of the single toothing into two parts along the extension of the generatrix curve of the tooth.

[0082] However, it can be proposed that there will be an axial offset, for example, between the first drive gear 32.1 and the second drive gear 32.2. For example, the first drive gear 32.1 and the second drive gear 32.2 can be axially offset so that there is no plane perpendicular to the central axis AC which simultaneously intersects the toothing of the first drive gear 32.1 and the second drive gear 32.2. In this case, it can have an intermediate gear 40 which has sufficient extension along the axis to simultaneously directly engage the first drive gear 32.1 and the second drive gear 32.2. It can then be an intermediate gear 40 having a single toothing. There can also be a double intermediate gear in the form of two coaxial intermediate gears which overlap and are connected to rotate around their common axis Ai, one directly engaging the first drive gear 32.1 and the other directly engaging the second drive gear 32.2.

[0083] In the illustrated example, the toothing of the peripheral crown gear 34, the first drive gear 32.1, the intermediate gear 40 and the second drive gear 32.2 is straight toothing, the generatrix of the tooth being a straight line and parallel to the respective axes of the three components, which in turn are parallel to each other. However, it can be proposed that the toothing is helical, or herringbone, etc... and can be either cylindrical or conical.

[0084] In this example, the second drive gearwheel 32.2 is carried by the upper part of the second drive planetary gearwheel 28.2. Therefore, the second drive gearwheel 32.2 is arranged above the planetary gearwheel carrier 26, in this case above the disc-shaped plate. Therefore, the second drive gearwheel 32.2 is housed in the same protected volume as the first drive gearwheel 32.1 and the peripheral crown gearwheel 34, above the planetary gearwheel carrier 26, and therefore not visible from the outside of the cooking preparation household appliance 12. The same applies therefore to the one or more intermediate transmission wheels 40.

[0085] The cooking preparation household appliance 12 can be of the type in which, for a given speed of the planetary gearwheel carrier 26, the first drive planetary gearwheel 28.1 and the second drive planetary gearwheel 28.2 rotate about their respective working axes Al, A2 at a rotational speed which is different from each other in absolute value. Preferably, for a given speed of the planetary gearwheel carrier, the second drive planetary gearwheel 28.2 rotates about the second working axis A2 at a rotational speed which is greater than the absolute value of the rotational speed of the first drive planetary gearwheel 28.1 about the first working axis Al in absolute value. For example, the second drive gearwheel 32.2 and therefore the second drive planetary gearwheel 28.2 rotates about the second working axis A2 at a rotational speed which is between 1.1 and 2.0 times the absolute value of the rotational speed of the first drive planetary gearwheel about the first working axis Al in absolute value. This is particularly advantageous because it is possible in this way to drive the first working tool at a first working speed or the second working tool at a different, in particular higher, second working speed, for example between 1.1 and 2.0 times the first working speed, the speed of the motor 30 being the same in both cases and the speed of the kinematic chain between the motor and the tool carrier being the same. It is even more advantageous that the speed of the motor is generally limited on the one hand to a minimum value and on the other hand to a maximum value, the two different speeds of the two couplings allowing to extend the range of ratios of the working tools in absolute value. Therefore, the first coupling will be used for working tools which require low speeds and possibly high torques, and the second coupling will be used for working tools which require higher speeds and possibly lower torques.

[0086] In general, the cooking preparation household appliance 12, the first working tool 14.1 and the second working tool 14.2 belong to a cooking preparation household appliance system 10, said system comprising a cooking preparation household appliance 12, at least one first working tool and at least one second working tool, said first working tool being configured to allow it to be coupled to a first coupling of the cooking preparation household appliance 12, said second working tool being configured to allow it to be coupled to a second coupling of the cooking preparation household appliance 12.

[0087] As shown in the illustrated embodiment comprising a single intermediate transmission wheel 40, the second drive gear 32.2 has a different number of teeth, and therefore a different diameter, than the first drive gear 32.1, in this case a smaller number of teeth. In the embodiment in which the second drive gear 32.2 cooperates with the first drive gear 32.1 through the single intermediate transmission wheel 40, the ratio of the absolute values of the rotational speeds between the second drive gear 32.2 and the first drive gear 32.1 is inversely proportional to the ratio of the number of teeth of the second drive gear 32.2 with respect to the first drive gear 32.1.

[0088] In the illustrated example, the first working axis Al and the second working axis A2 have the same eccentricity with respect to the central axis AC. It can be said that they are arranged on the same diameter, or at the same distance from the central axis AC. This allows the first working tool and the second working tool to have comparable working tool geometries with respect to the geometry of the container. To this end, it is important that the second drive gear 32.2 has a different number of teeth, and therefore a different diameter, than the first drive gear 32.1, since even if the working axes are arranged with the same eccentricity with respect to the central axis AC, interference between the teeth of the second drive gear 32.2 and the peripheral crown wheel 34 is avoided.

[0089] However, it can be proposed that the first working axis Al and the second working axis A2 have different eccentricities with respect to the central axis AC, for example that the eccentricity of the second working axis A2 with respect to the axis AC is smaller than that of the first working axis Al. With this arrangement, for the same working container, the possibility of a second working tool 14.2 with a larger diameter is obtained, which facilitates a higher tangential speed of the working tool for the same rotational speed around the second working axis A2.

[0090] In some embodiments, the first coupling 30.1 and the second coupling 30.2 can have the same working tool coupling geometry. In this case, it can be envisaged that the same working tool can be mounted on the first coupling 30.1, and therefore on the first drive planetary gear 28.1, or on the second coupling 30.2, and therefore on the second drive planetary gear 28.2, without difference between the two.

[0091] However, it can be advantageously proposed that the first coupling 30.1 and the second coupling 30.2 have first and second working tool coupling geometries, respectively, which are different from each other.

[0092] Different coupling geometries between a working tool and a cooking preparation household appliance 12 are known as such. The coupling geometry determines the coupling mechanism, the role of which is to ensure that the working tool is secured to the driving planet gear in conditions suitable for allowing the working tool to perform the food preparation work for which it was designed. Typically, the coupling geometry allows the working tool to be locked in all directions relative to the coupler. For example, coupling geometries defining a bayonet type coupling mechanism are known. Also known are coupling geometries defining a coupling mechanism comprising a flat or toothed bar constituting a part of the working tool or of the coupler, or a bar having one or more radial protrusions and a hole having a complementary shape on the other of the working tool and the coupler. Typically, the coupling geometry defines a coupling mechanism that allows the working tool to be coupled and uncoupled from the coupler manually, thus without the need to use a tool to achieve the coupling.

[0093] By having, on the one hand, the first coupler 30.1 and the first working tool 14.1 have different coupling geometries, and on the other hand, the second coupler 30.2 and the second working tool 14.2 have different coupling geometries, it is possible to adapt the coupling geometry to the respective work of the two working tools, in particular to the torque of the force exerted on the working tools and thus on the couplers during the work.

[0094] In particular, it can be advantageously proposed that the first coupler 30.1 is configured to prohibit the coupling of the second working tool 14.2 and / or the second coupler 30.2 is configured to prohibit the coupling of the first working tool 14.1. Note that it is possible to prohibit the installation of the first working tool 14.1 onto the second coupler 30.2 without necessarily prohibiting the installation of the second working tool 14.2 onto the first coupler 30.1, or vice versa.

[0095] Advantageously, the cooking preparation household appliance system 10 can be configured to prevent the installation of the first working tool 14.1 onto the first coupler 30.1 while the second working tool 14.2 is installed onto the second coupler 30.2. For example, such a cooking preparation household appliance system 10 can comprise a cover that will be installed to be mobile on the planet gear carrier between two positions, in one of which the cover allows access to the first coupler and prevents access to the second coupler, and in the other of which the cover allows access to the second coupler and prevents access to the first coupler. Additionally or alternatively, such a cooking preparation household appliance system 10 can comprise a cover that will be connected to the working tools, and which, when the working tools are coupled to the respective couplers, will prevent access to the other coupler.

[0096] Preferably, the first working axis A1 and the second working axis A2 are spaced apart from each other by an angle of less than or equal to 180 degrees, preferably less than or equal to 120 degrees, more preferably less than or equal to 90 degrees, about the central axis AC. In the illustrated example in which the second drive gear 32.2 is indirectly engaged with the first drive gear 32.1 by the intermediate transmission wheel 40, the first working axis A1 and the second working axis A2 are spaced apart from each other by an angle in the range of 45 degrees to 90 degrees about the central axis AC.

[0097] In the illustrated example, the intermediate transmission wheel 40 is arranged so that its axis of rotation Ai also has the same eccentricity with respect to the central axis AC as the first working axis A1 and the second working axis A2. However, it can have a different eccentricity with respect to either of these axes, or even different from both of these axes. For example, it can be proposed that the intermediate transmission wheel 40 is arranged so that its eccentricity with respect to the central axis AC is less than the eccentricity of the first working axis A1 and possibly also less than the eccentricity of the second working axis A2. In the case in which the intermediate transmission wheel 40 is arranged radially inward with respect to the first drive gear 32.1 and with respect to the second drive gear 32.2, for the same wheel diameter, it is possible to bring the first drive gear 32.1 and the second drive gear 32.2 close together angularly, with the angular spacing between the first working axis A1 and the second working axis A2 about the central axis AC being reduced, whereby this angular spacing can be less than an angle of 45 degrees.

[0098] By recombining the two couplings within the same angular sector of the planet carrier 26, for example in which the angular spacing between the first working axis A1 and the second working axis A2 about the central axis AC is less than an angle of 90 degrees, or even less than an angle of 45 degrees, it is possible to arrange the two couplings within the same reinforced sector of the planet carrier 26.

[0099] The present application allows the production of a cooking preparation household appliance comprising two output couplings, in particular with different rotation speeds, by simply changing the planet carrier 26, without the need for other modifications to existing appliances comprising a single output coupling on the planet carrier. In fact, in both cases the planet carrier has a single drive gear directly meshing with a peripheral crown gear.

Claims

1. A cooking preparation household appliance (12), comprising: a base (15) having a base (16) with a receiving area (17) configured to receive a working container (20), A head (22) connected to the base (15), the head (22) having a planetary gear carrier (26) driven by a motor (30) to rotate around a central axis (AC) and carrying: A first driving planetary gear (28.1) is mounted to rotate freely on the planetary gear carrier (26) about a first working axis (A1), the first working axis being parallel to the central axis (AC) and eccentric relative to the central axis (AC), the first driving planetary gear (28.1) comprising: a first coupling (30.1) configured to allow coupling and decoupling of a first working tool (14.1) and to ensure driving the first working tool (14.1) in rotation relative to the planetary gear carrier (26) about the first working axis (A1), the first coupling (30.1) being arranged opposite the receiving area (17); a first drive gear (32.1) having the first working axis (A1) as its axis, the first drive gear being integral in rotation with the first drive planetary gear (28.1) and cooperating with the inner gear teeth of a peripheral crown gear (34) having the central axis (AC) as its axis of symmetry, so as to cause the first drive planetary gear (28.1) to rotate about the first working axis (A1) during a differential rotation of the planetary gear carrier (26) relative to the peripheral crown gear (34); A second driving planetary gear (28.2), which is separate from the first driving planetary gear (28.1) and is mounted to rotate freely on the planetary gear carrier about a second working axis (A2), the second working axis (A2) being parallel to the central axis (AC) and eccentric relative to the central axis (AC), and separate from the first working axis (A1), the second driving planetary gear (28.2) comprising: a second coupling (30.2) configured to allow coupling and decoupling of a second working tool (14.2) and to ensure driving the second working tool (14.2) in rotation relative to the planetary gear carrier (26) about the second working axis (A2), the second coupling (30.2) being arranged opposite the receiving area (17); a second driving gear (32.2) having the second working axis (A2) as its axis and rotating integrally with the second driving planetary gear; The invention is characterized in that the second drive gear (32.2) is indirectly matched with the first drive gear (32.1) through at least one intermediate transmission wheel (40), and the intermediate transmission wheel is freely rotatably mounted on the planetary gear carrier (26), so that the first drive gear (32.1) drives the second drive gear (32.2) and the second drive planetary gear (28.2) to rotate around the second working axis (A2) through the at least one intermediate transmission wheel (40). The second driving planetary gear (28.2) rotates around the second working axis (A2) in the same rotational direction as the first driving planetary gear (28.1) rotates around the first working axis (A1).

2. The cooking preparation household appliance (12) according to claim 1, characterized in that The second drive gear (32.2) is indirectly coupled to the first drive gear (32.1) via a single intermediate transmission wheel (40) freely rotatably mounted on the planetary gear carrier (26); the single intermediate transmission wheel (40) is directly meshed with the first drive gear (32.1) and simultaneously directly meshed with the second drive gear (32.2).

3. The cooking preparation household appliance (12) according to claim 1, characterized in that It has a plurality of intermediate transmission wheels (40) which are arranged in cascade between the first drive gear (32.1) and the second drive gear (32.2), and the intermediate transmission wheels (40) are gears with external gear teeth which are freely rotatably mounted on the planetary gear carrier (26).

4. The cooking preparation household appliance (12) according to any one of claims 1 to 3, characterized in that The first drive gear (32.1) and the second drive gear (32.2) each have a different number of teeth.

5. The cooking preparation household appliance (12) according to claim 4, characterized in that The second drive gear (32.2) has a smaller number of teeth than the first drive gear (32.1), so that for a given speed of the planetary gear carrier (26), the second drive planetary gear (28.2) rotates around the second working axis (A2) at a speed whose absolute value is greater than the absolute value of the speed of the first drive planetary gear (28.1) around the first working axis (A1).

6. A household appliance (12) for preparing food according to any one of claims 1 to 3, characterized in that The second driving planetary gear (28.2) rotates about the second working axis (A2) at a rotational speed between 1.1 and 2.0 times the rotational speed of the first driving planetary gear (28.1) about the first working axis (A1).

7. A household appliance (12) for preparing food according to any one of claims 1 to 3, characterized in that The peripheral crown gear (34), the first drive gear (32.1), the second drive gear (32.2) and the intermediate transmission wheel (40) are coplanar.

8. The cooking preparation household appliance (12) according to claim 2, characterized in that: - said peripheral crown wheel (34) has a single internal toothing, - the first drive gear (32.1) is a gear with a single outer gear tooth that directly meshes with the inner gear tooth of the peripheral crown gear (34), - the intermediate transmission wheel (40) is a gear having a single outer gear tooth that directly meshes with the outer gear teeth of the first drive gear (32.1), and - The second drive gear (32.2) has external gear teeth that mesh directly with the external gear teeth of the intermediate transmission wheel (40).

9. A household appliance (12) for preparing food according to any one of claims 1 to 3, characterized in that The first working axis (A1) and the second working axis (A2) have the same eccentricity relative to the central axis (AC).

10. The cooking preparation household appliance (12) according to any one of claims 1 to 3, characterized in that The first coupling (30.1) and the second coupling (30.2) respectively have first and second working tool coupling geometries that are different from each other.

11. A cooking preparation household appliance system (10), comprising: A household appliance (12) for preparing food according to any one of claims 1 to 10, a first working tool (14.1) configured to allow it to be coupled to a first coupling (30.1) of the food preparation household appliance (12), A second working tool (14.2) is configured to allow it to be coupled to a second coupling (30.2) of the food preparation appliance (12).

12. The cooking preparation household appliance system (10) according to claim 11, characterized in that The first working tool (14.1) is configured to inhibit coupling to the second coupling (30.2).

13. The cooking preparation household appliance system (10) according to claim 11 or 12, characterized in that The second working tool (14.2) is configured to inhibit coupling to the first coupling (30.1).

14. The cooking preparation household appliance system (10) according to claim 11 or 12, characterized in that The first coupling (30.1) is configured to inhibit coupling of the second working tool (14.2) and / or the second coupling (30.2) is configured to inhibit coupling of the first working tool (14.1).

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