Cooking preparation device for cooking preparation equipment

Abstract

A cooking preparation device for a cooking preparation apparatus, comprising:-a rotating inner shaft (10); -a working tool (20) which is mounted on the rotating inner shaft (10) in a screwed manner; the invention is characterized in that: the cooking preparation device comprises a drive device (30) having a first rotating hub (31) and a second rotating hub (32); -the rotating inner shaft (10) can be coupled to the first rotating hub (31); the cooking preparation device comprises a rotating hollow shaft (40); the rotating hollow shaft (40) is mounted on the rotating inner shaft (10) in a pivoting or sliding pivoting manner; the rotating hollow shaft (40) comprises a beveled contact surface (41); and the rotating hollow shaft (40) comprises the second rotating hub (32); wherein the working tool (20) comprises a mating profile (25), the mating profile (25) being arranged in contact with the beveled contact surface (41).

Description

Technical Field

[0001] The present invention generally relates to culinary preparation appliances, in particular domestic appliances equipped with or comprising at least one rotating working tool, such as a blender, knife, beater, mixer or the like, which are arranged to process food, for example, placed in a working container. Background Art

[0002] It is known in the prior art to arrange the vertical movement of the working tool in the working container to achieve uniform processing of all the food contained in the working container. Document EP2445636B1 discloses such a device. On the other hand, the disclosed mechanism is complex and has many parts that are difficult to manufacture and assemble. Summary of the invention

[0003] The object of the present invention is to solve the above-mentioned disadvantages of the prior art and in particular to propose for the first time a culinary preparation device for a culinary preparation appliance which allows the food contained in a working container to be processed over its entire height and / or in a more uniform manner, without increasing the complexity and without requiring parts that are difficult to manufacture.

[0004] To this end, a first aspect of the present invention relates to a cooking preparation device for a cooking preparation apparatus, the cooking preparation device comprising:

[0005] - Rotate the inner shaft;

[0006] - a working tool, which is screw-connected to the rotating inner shaft;

[0007] Features:

[0008] - the culinary preparation device comprises a drive device having a first rotating hub and a second rotating hub, the first rotating hub and the second rotating hub being arranged to be driven in rotation at a first rotation speed and at a second rotation speed, respectively;

[0009] - the rotating inner shaft (10) comprises a first coupler, the first coupler being arranged to be coupled to the first rotating hub so as to be driven in rotation at the first rotation speed;

[0010] - The culinary preparation device comprises a rotating hollow shaft:

[0011] The rotating hollow shaft is mounted on the rotating inner shaft in a pivot connection or a sliding pivot connection;

[0012] The rotating hollow shaft comprises a beveled contact surface; and

[0013] the rotating hollow shaft comprises the second rotating hub or a second coupler, the second coupler being arranged to be coupled with the second rotating hub so as to be driven in rotation at the second rotation speed;

[0014] Wherein, the working tool comprises a matching molded part,

[0015] And wherein the chamfered contact surface is arranged to contact the counter-formed part of the working tool to force the working tool to move axially on the rotating inner shaft.

[0016] According to the above-described embodiment, the device generally comprises, on the one hand, a drive device having two rotating hubs and a tool holder assembly (rotating inner shaft, working tool and rotating hollow shaft). Thus, the tool holder consists of only three parts, which forms an assembly that is easy to manufacture and assemble, but the working tool can be displaced axially. In particular, it can be noted that the spiral connection is arranged to cause the working tool to rise along the rotating inner shaft, while the rotating hollow shaft with the beveled contact surface is arranged to force an axial downward displacement. Specifically, the working tool is subjected to a reaction force from the food when it rotates at a first rotational speed and processes the food to be prepared, which causes an axial upward displacement due to the spiral connection. Therefore, the rotating hollow shaft with the beveled contact surface and rotating at a second rotational speed is in relative motion with the working tool, which causes a relative displacement between the mating profile of the working tool and the beveled contact surface of the rotating hollow shaft and forces the working tool to move downward.

[0017] According to one embodiment, the first rotating hub is mounted on the second rotating hub in a pivotally connected manner. According to this embodiment, the first rotating hub is pivotally mounted on the second rotating hub, and it can generally be provided that the second rotating hub forms or comprises a ring or bearing penetrated by the first rotating hub and / or the rotating inner shaft.

[0018] According to one embodiment, the helical connection of the working tool has a helix angle on the rotating inner shaft comprised between 30° and 60°. Such a helix angle allows an axial displacement of the working tool under the effect of the reaction forces exerted on the working tool by the processed food.

[0019] According to one embodiment, the chamfered contact surface and / or the counter-shaped part comprises or has:

[0020] - at least one tangent line or tangential direction, which is inclined relative to the axial direction of the rotating inner shaft; and / or

[0021] - at least one normal or normal direction having a first component parallel to the axial direction of the rotating inner shaft and a second component normal to or perpendicular to the axial direction of the rotating inner shaft. The chamfered contact surface and / or the counter-shaped part are well suited for transmitting axial forces which cause an axial displacement of the working tool.

[0022] According to one embodiment, the first coupler is formed at a first end of the rotating inner shaft, and the rotating inner shaft comprises a centering portion, which is arranged at a second end of the rotating inner shaft;

[0023] The cooking preparation device comprises a centering bearing, which is arranged to receive the centering portion. The centering bearing can be arranged at the bottom of the working container to guide the rotating inner shaft well at both ends thereof.

[0024] According to one embodiment, the culinary preparation device may comprise a working container or culinary preparation bowl having a side wall and a bottom.

[0025] According to one embodiment, the centering bearing is formed in the bottom of the working container.

[0026] According to one embodiment, the culinary preparation device comprises a removable cup forming a removable cover of the working container, wherein the removable cup comprises the first rotating hub and the second rotating hub. The removable cup carries the first rotating hub and the second rotating hub to form a subassembly that is easy for the user to manipulate.

[0027] According to one embodiment, the drive device comprises a speed reducer, which is arranged between the first rotating hub and the second rotating hub.

[0028] According to one embodiment, the reducer comprises at least one double pinion having a first toothing engaged with the first rotating hub and a second toothing engaged with the second rotating hub. Such a double pinion allows the rotation speed of the second rotating hub to be easily increased or decreased from the first rotating hub.

[0029] According to one embodiment, the speed reducer includes three double pinions, each of which has a first tooth portion engaged with the first rotating hub and a second tooth portion engaged with the second rotating hub.

[0030] According to one embodiment, the first tooth portion includes a first number of teeth and the second tooth portion includes a second number of teeth different from the first number of teeth, so as to have a reduction ratio different from 1 and between 1.2 and 0.8, preferably between 1.01 and 1.2, so that the second rotational speed is greater than the first rotational speed.

[0031] According to one embodiment, the drive device comprises an input shaft, which is engaged with the first rotating hub and the second rotating hub and is arranged to be coupled and driven by a drive motor. The input shaft may form a drive nut for quick and safe coupling with the drive motor.

[0032] According to one embodiment, the input shaft is formed on the first rotating hub.

[0033] According to one embodiment, the drive means comprises at least one drive motor engaged with the first rotating hub and the second rotating hub, and the drive means preferably comprises a single drive motor engaged with the first rotating hub and the second rotating hub.

[0034] According to one embodiment, said removable cup comprises said drive means.

[0035] According to one embodiment, the removable cup forms part of a housing containing at least one drive motor.

[0036] According to one embodiment, the drive motor may be removably arranged relative to the rest of the drive device, typically the drive motor may be removably or detachably arranged relative to the removable cup to allow possible cleaning.

[0037] According to one embodiment:

[0038] - the rotating hollow shaft comprises a first end and a second end, the first end having a chamfered contact surface and the second end having a second coupler arranged to couple with the second rotating hub; or

[0039] The rotating hollow shaft comprises a first end and a second end, the first end having the chamfered contact surface, the second end having the second rotating hub, and preferably the rotating hollow shaft is formed integrally with the second rotating hub.

[0040] According to one embodiment, the bottom of the working container is removable and comprises a sealing joint for easy cleaning.

[0041] According to one embodiment, the assembly of the first rotating hub and the first coupler forms a spline coupler.

[0042] According to one embodiment, the assembly of the second rotating hub and the second coupler forms a coupler with asymmetric teeth, each tooth having a stop face parallel to the axial direction of the rotating inner shaft and a sliding face inclined relative to the axial direction of the rotating inner shaft. The inclined sliding face allows compensation of angular displacements, and the stop face allows transmission of drive forces to the rotating hollow shaft.

[0043] According to one embodiment, the chamfered contact surface and the counter-formed piece are substantially flat surfaces which are inclined with respect to the axial direction of the rotating inner shaft.However, complex and non-flat surfaces may be provided.

[0044] According to one embodiment, the chamfered contact surface and the counter-formed piece are helical surfaces inclined at a predetermined helical angle relative to the axial direction of the rotating inner shaft.

[0045] According to one embodiment, the removable cup comprises movement safety means arranged to engage with the working container and to engage with the control unit of the drive motor only when it is engaged with the working container.

[0046] According to one embodiment, the first rotational speed is different from the second rotational speed, and preferably, the first rotational speed is in the same direction as the second rotational speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Other characteristics and advantages of the present disclosure will become more apparent on reading the following detailed description of embodiments of the present disclosure given by way of non-limiting example and illustrated by the accompanying drawings, in which:

[0048] Figure 1 An overall view of a cooking preparation device according to the present invention is shown, which generally comprises a working container, a drive device and a motor housing;

[0049] Figure 2 Shows Figure 1 A working container-drive device subassembly, wherein a side wall of the working container is omitted or made transparent to illustrate a tool holder assembly disposed in the working container;

[0050] Figure 3 Shows Figure 2 The tool holder assembly includes a rotating inner shaft, a working tool, a rotating hollow shaft and Figure 1 a first rotating hub of a driving device;

[0051] Figure 4 The bottom of the working container is shown. Figure 3 The rotating inner shaft;

[0052] Figure 5 Shows Figure 3 working tools;

[0053] Figure 6 Shows Figure 3 Two perspective views of a first rotating hub;

[0054] Figure 7Shows Figure 3 A rotating hollow shaft;

[0055] Figure 8 Shows Figure 1 or Figure 2 Two stereograms of the drive device;

[0056] Fig. 9 Shows Figure 1 or Figure 2 Two perspective views of the inner part of the drive device;

[0057] Fig.10 Shows Figure 2 or Figure 3 An exploded view of a tool holder assembly having Figure 1 or Figure 2 A part of a drive device;

[0058] Fig.11 Shows that the work is ready Figure 1 Schematic diagram of cooking preparation equipment;

[0059] Fig.12 Shows Fig.11 Schematic diagram of a cooking preparation device after an axial upward movement of the working tool;

[0060] Fig.13 Shows Fig.12 Schematic diagram of a cooking preparation device after an axial downward movement of the working tool;

[0061] Fig.14 Shows Figure 1 Schematic diagram of an alternative embodiment of a drive device and a rotating hollow shaft of a food preparation device;

[0062] Fig.15 Shows Fig.14 Another schematic diagram of an alternative embodiment of a drive device and a rotating hollow shaft of a food preparation device. DETAILED DESCRIPTION

[0063] Figure 1 The overall view of the food preparation device according to the present invention is shown, which generally comprises a working container 50 , a motor housing 60 accommodating a driving motor, and a driving device 30 arranged between the working container 50 and the motor housing 60 .

[0064] like Figure 2 As shown, the working container 50:

[0065] - includes a side wall 52 (omitted or transparent, shown in dotted lines) and a bottom 51;

[0066] - comprising a rotating inner shaft 10 and a rotating hollow shaft 40, wherein the rotating inner shaft 10 supports a working tool 20;

[0067] - The drive device 30 is supported at the top and can be stored Figure 1 The motor housing 60 is provided to transmit the rotational driving motion of the motor accommodated in the motor housing 60 to the working tool 20 .

[0068] It can be noted that the driving device 30 is interposed between the working container 50 and the motor housing 60 to drive the working tool 20. Figure 1 In the embodiment, the drive device 30 closes the working container 50 and is disconnected from the motor housing 60. A reversible coupling can be provided between the drive device 30 and the motor housing 60, but it can be preferably provided that the drive device 30 is permanently integrated on the motor housing 60, or a detachable coupling is provided between the drive device 30 and the motor housing 60, for example for cleaning.

[0069] In any case, the drive device 30 (or the motor housing 60 in the case where the drive device 30 includes or is permanently integrated in the motor housing 60) is arranged to be reversibly coupled to the working container 50 so as to open and close the working container 50 so that food and / or working tools 20 can be placed therein or removed therefrom.

[0070] exist Figure 2 In the drawing, it can be noted that the drive device 30 comprises a first rotating hub 31, a removable cup 35 serving as a frame or chassis of the drive device 30, a sealing plate 33 and thin sheets 34, which form part of a safety device that prohibits starting the motor of the motor housing 60 if the working container 50 is not properly coupled to the removable cup.

[0071] Figure 3 The rotating inner shaft 10 and the rotating hollow shaft 40 are shown. The rotating inner shaft 10 supports the working tool 20 , and a second rotating hub 32 is directly formed on the rotating hollow shaft 40 , and the second rotating hub 32 receives the first rotating hub 31 .

[0072] In other words, as will be described below, a pivot connection is provided between the first rotating hub 31 and the second rotating hub 32 (in this embodiment a rotating hollow shaft 40 ): these two components can rotate freely relative to each other.

[0073] It is provided that the working tool 20 can be displaced axially along the rotating inner shaft 10 according to a reciprocating motion. For this purpose, a screw connection is provided between the rotating tool 20 and the rotating inner shaft 10.

[0074] Figure 4A rotating inner shaft 10 is shown, which is pivotally mounted on the bottom 51 and has a double thread 12 arranged to about half the height of the rotating inner shaft 10. The upper part of the rotating inner shaft 10 remains smooth and the upper end of the rotating inner shaft 10 forms a spline end piece 13, which forms a first coupler for engaging with or in the first rotating hub 31. The lower part of the rotating inner shaft 10 includes a centering portion, which is therefore arranged at the second end of the rotating inner shaft 10.

[0075] The bottom 51 is assembled with the side wall 52 of the working container 50 in a sealed manner. Figures 11 to 15 A centering bearing 53, which is more clearly visible in FIG. 5 , is formed in the bottom 51 of the working container 50. The centering bearing 53 is arranged to receive the centering portion.

[0076] Figure 5 The working tool 20 is shown, which comprises a body 24 on which two blades 23 are mounted and which is extended by a chamfered post comprising a through-going central hole 21 having a spiral groove 22 and chamfered side surfaces forming a mating profile 25 (the mating profile 25 having a helical groove 22 on both sides of the hole 21). Figure 5 It can be noted that the rotating inner shaft 10 is arranged to penetrate the central hole 21 and the double thread 12 can engage with the spiral groove 22.

[0077] Upon rotation of the working tool 20 imparted by the rotating inner shaft 10 , the processed food in turn imparts a reaction force or reaction torque to the working tool 20 , and the screw connection allows this reaction force or reaction torque to be converted into an axial force to cause an upward axial displacement of the working tool 20 .

[0078] In the example shown, the working tool 20 carries two blades 23 for cutting food, but various variants may be provided for implementing a masher, a beater, a mixer, a blender or the like.

[0079] Figure 6 Two perspective views of the first rotating hub 31 are shown, which includes a grooved head 311, a first toothed portion 312 and a lower shaft portion 313. It can be noted that in the right side view, the lower shaft portion 313 includes a grooved hole 314, which is arranged to receive the spline end piece 13 of the rotating inner shaft 10. The first rotating hub 31 is arranged to drive the rotating inner shaft 10 in rotation.

[0080] Figure 7 4 shows a perspective view of the rotating hollow shaft 40. As mentioned above, in this embodiment, the second rotating hub 32 is directly integrated into the rotating hollow shaft 40. However, two separate components may be provided. Figure 7 In the example of FIG. 4 , the rotating hollow shaft 40 includes a central hole 323, which can accommodate:

[0081] - through the top, pivotally connected lower shaft portion 313; and

[0082] - Through the bottom, turn the inner shaft 10.

[0083] The teeth 321 are provided at the upper part, and the cylindrical post 322 is provided to engage in a bearing (a sliding ring, a ball bearing, etc. may be provided) of the removable cup 35. Thus, the second rotating hub 32 is pivotally connected relative to the removable cup 35 and can receive the first rotating hub 31 in a pivotally connected manner.

[0084] The rotating hollow shaft 40 also comprises, in a lower portion, a chamfered contact surface 41 which is arranged to cooperate with a chamfered side surface of a counter-shaped piece 25 forming the working tool 20 .

[0085] In fact, as described below, the drive device 30 is configured to:

[0086] - driving the inner shaft and thus the working tool 20 in rotation at a first rotational speed via the first rotating hub 31 ; and

[0087] - driving the hollow shaft 40 in rotation at a second rotational speed via the second rotating hub 32,

[0088] The rotating hollow shaft 40 and the working tool 20 are caused to have an angular velocity difference and a constant angular phase shift occurs between these two components during food processing.

[0089] As described above, the working tool 20 is naturally pushed upward by the reaction torque of the processed food and the screw connection, so that the counterpart shaped piece 25 of the working tool 20 finally contacts the chamfered contact surface 41 due to the angular velocity difference between the rotating hollow shaft 40 and the working tool 20. During the relative rotation of 360° between the rotating hollow shaft 40 and the working tool 20, the chamfered contact surface 41 slides on the counterpart shaped piece 25 so as to alternately:

[0090] - Push the working tool 20 downwards, then

[0091] - Raise the working tool 20 upward.

[0092] The axial movement of the working tool 20 is therefore an alternating rise and fall in the working container 50 .

[0093] Specifically, Figure 8 and Fig. 9 The drive device 30 shown includes a removable cup 35 which in this embodiment supports:

[0094] On the one hand, in the upper part ( Figure 8 Left side view):

[0095] - a first rotating hub 31 of the upper part;

[0096] - Sealing plate 33;

[0097] - a sheet 34 of a safety device;

[0098] On the other hand, in the lower part ( Figure 8 Right side view):

[0099] - Rotate the hollow shaft 40 .

[0100] It can be noted that the tab 34 is visible in the right side view and opens into a groove which should receive the side wall 52 of the working container 50 : if the side wall 52 is correctly in place, the tab 34 is subjected to a displacement which allows the correct installation to be detected, authorizing the motor to work in full safety.

[0101] Fig. 9 The interior of the cup 35 is shown: three double pinions 36 are engaged between the first rotating hub 31 and the second rotating hub 32. The double pinions 36 are identical, the first toothing is engaged with the first rotating hub 31 and the second toothing is engaged with the second rotating hub 32. In order to apply a speed difference between the rotating hollow shaft 40 and the working tool 20, the first toothing has a different number of teeth than the second toothing. A reduction ratio between 0.8 and 1.2 can be provided. A differential tooth can be provided, for example, for 20 teeth.

[0102] In summary, the first rotating hub 31 is driven by the motor of the culinary preparation device at a first rotational speed and converts this motion:

[0103] - directly and without reduction ratio to the rotating inner shaft 10;

[0104] - transmitted to the double pinion 36.

[0105] The double pinion 36 is rotated by the driving rotating hollow shaft 40 , but due to the difference in the number of teeth between the first tooth section and the second tooth section, the rotating hollow shaft has a second rotation speed different from the first rotation speed.

[0106] Fig.10 The schematic shows an exploded view of the above installation:

[0107] - Rotating inner shaft 10 supports working tool 20 at the bottom;

[0108] - the first rotating hub 31 is mounted in the second rotating hub 32;

[0109] - three double pinions 36 are engaged between the first rotating hub 31 and the second rotating hub 32;

[0110] The splined end piece 13 of the rotating inner shaft 10 engages in the recessed hole 314 of the lower shaft portion 313 of the first rotating hub 31 .

[0111] Fig.11 is a schematic diagram of a cooking preparation device in a working configuration, wherein the food 200 to be prepared is placed in a working container 50 having a working tool 20, a rotating inner shaft 10 and a hollow shaft 40. A drive device 30 with a removable cup 35 covers the working container 50, and a motor M is coupled to a first rotating hub 31. The working tool 20 is located at the bottom of the working container 50. It can be noted that the second rotating hub (here the rotating hollow shaft 40) is mounted on ball bearings (black squares) that are press-fitted into the removable cup 35.

[0112] Fig.12 Shows that after working for a period of time Fig.11 The motor M drives the rotating inner shaft to rotate at a first rotation speed via the first rotating hub 31. The reaction torque applied by the food 200 to be prepared on the working tool 20 is converted into an upward axial force through the thread of the rotating inner shaft 10, so that the working tool 20 is displaced upward until it contacts the chamfered contact surface of the rotating hollow shaft 40.

[0113] In the subsequent rotation process, the rotating hollow shaft 40 is driven at a second rotation speed through the double pinion 36, and the rotating hollow shaft 40 is angularly displaced relative to the working tool 20 and gradually pushes the working tool 20 downward, such as Fig.13 As shown, it can be noted that Fig.12 In contrast, the rotating hollow shaft 40 is displaced by 180° relative to the working tool 20 , which is now again located at the bottom of the working container 50 .

[0114] Fig.14 An alternative embodiment is shown in which the rotating hollow shaft 40 and the second rotating hub 32 are two separate components.

[0115] Specifically, the second rotating hub 32 always carries the first rotating hub 31 in a pivoting manner and is mounted on the removable cup 35 via a ball bearing (black square). However, the rotating hollow shaft 40 slides on the rotating inner shaft 10 in a pivoting manner and rests on the working tool 20. A second coupler can be provided between the rotating hollow shaft 40 and the second rotating hub 32, and the second coupler is formed, for example, by lower teeth 62 and upper teeth 61, which are arranged on the side wall of the rotating hollow shaft 40 and are oriented upward, and these upper teeth 61 are arranged on the side wall of the second rotating hub 32 and are oriented downward. Specifically, the upper teeth 61 of the second rotating hub 32 are oriented downward. Fig.14 The lower teeth 62 of the rotating hollow shaft 40 are opposite, and Fig.15 Clearly visible in.

[0116] like Fig.15 As shown, when the removable cup 35 is removed, the rotating hollow shaft 40 remains on the rotating inner shaft 10 in the working container 50. During operation, only the first working phase is different. In fact, during the first rise of the working tool 20, the rotating hollow shaft 40 is disengaged from the second rotating hub 32 and rotates at the same speed as the working tool 20.

[0117] When the working tool 20 reaches its top dead center, the working tool 20 forces the rotating hollow shaft 40 to engage with the second rotating hub 32 due to the asymmetric shapes of the lower teeth 62 and the upper teeth 61 of the second coupler. Then, the second rotating hub 32 is driven at the second rotational speed, and thus an angular phase shift is applied between the working tool 20 and the rotating hollow shaft 40.

[0118] Then, the operation of the first embodiment is resumed: the rotating hollow shaft 40 is then driven at the second rotational speed via the double pinion 36 , the rotating hollow shaft 40 is angularly displaced relative to the working tool 20 and gradually pushes the working tool 20 downwards via the chamfered contact surface 41 and the counter-shaped piece 25 .

[0119] Industrial Applications

[0120] The culinary preparation device according to the invention and its manufacture are capable of industrial application.

[0121] It should be understood that various modifications and / or improvements obvious to those skilled in the art may be made to the different embodiments of the invention described in this specification without departing from the scope of the invention.

[0122] In particular, it can be noted that other manufacturing configurations are possible at the first and second rotating hubs: the first rotating hub can be mounted on bearings of the removable cup, the motor shaft can be mounted on bearings of the removable cup, the removable cup can be integrated directly into the motor housing.

[0123] Other types of speed reducers with more or fewer pinions may also be provided to apply the first rotational speed and the second rotational speed. A satellite differential may be provided, and two separate motors may be provided.

Claims

1. A cooking preparation device for a cooking preparation apparatus, the cooking preparation device comprising: - rotating the inner shaft (10); - a working tool (20) which is mounted on the rotating inner shaft (10) in a screw-connected manner; Features: - the culinary preparation device comprises a drive device (30), the drive device (30) having a first rotating hub (31) and a second rotating hub (32), the first rotating hub (31) and the second rotating hub (32) being arranged to be driven in rotation at a first rotation speed and at a second rotation speed, respectively; - the rotating inner shaft (10) comprises a first coupler, the first coupler being arranged to be coupled with the first rotating hub (31) so as to be driven in rotation at the first rotation speed; - The cooking preparation device comprises a rotating hollow shaft (40): The rotating hollow shaft (40) is mounted on the rotating inner shaft (10) in a pivot connection or a sliding pivot connection manner; The rotating hollow shaft (40) comprises a chamfered contact surface (41); and The rotating hollow shaft (40) comprises the second rotating hub (32) or a second coupler, the second coupler being arranged to be coupled with the second rotating hub (32) so as to be driven in rotation at the second rotation speed; The working tool (20) comprises a matching molded part (25). And wherein the chamfered contact surface (41) is arranged to contact the counter-formed part (25) of the working tool (20) to force the working tool (20) to move axially on the rotating inner shaft (10).

2. The cooking preparation device according to claim 1, wherein: The first rotating hub (31) is mounted on the second rotating hub (32) in a pivotally connected manner.

3. The cooking preparation device according to any one of claims 1 to 2, wherein: The screw connection of the working tool (20) has a helix angle on the rotating inner shaft (10) between 30° and 60°.

4. A cooking preparation device according to any one of claims 1 to 3, - wherein the first coupler is formed at a first end of the rotating inner shaft (10), wherein The rotating inner shaft (10) comprises a centering portion, and the centering portion is arranged at the second end of the rotating inner shaft (10); The culinary preparation device comprises a centering bearing (53) arranged to receive the centering portion.

5. A culinary preparation device according to any one of claims 1 to 4, comprising a working container (50) having a side wall (52) and a bottom (51).

6. A culinary preparation device according to claim 5 as appended to claim 4, wherein: The centering bearing (53) is formed in the bottom (51) of the working container (50).

7. A culinary preparation device according to any one of claims 5 to 6, comprising a removable cup (35) forming a removable cover of the working container (50), wherein The removable cup (35) comprises the first rotating hub (31) and the second rotating hub (32).

8. The cooking preparation device according to any one of claims 1 to 7, wherein: The driving device (30) comprises a speed reducer, which is arranged between the first rotating hub (31) and the second rotating hub (32).

9. The cooking preparation device according to claim 8, wherein: The speed reducer comprises at least one double pinion (36) having a first tooth portion engaged with the first rotating hub (31) and a second tooth portion engaged with the second rotating hub (32).

10. The cooking preparation device according to claim 9, wherein: The speed reducer includes three double pinions (36), each of which has a first tooth portion engaged with the first rotating hub (31) and a second tooth portion engaged with the second rotating hub (32).

11. The cooking preparation device according to any one of claims 9 to 10, wherein: The first tooth portion includes a first number of teeth, and the second tooth portion includes a second number of teeth different from the first number of teeth, so as to have a reduction ratio different from 1 and between 1.2 and 0.8, preferably between 1.01 and 1.2, so that the second rotational speed is greater than the first rotational speed.

12. A cooking preparation device according to any one of claims 8 to 11, wherein: The drive device (30) comprises an input shaft which engages with the first rotating hub (31) and the second rotating hub (32) and is arranged to be coupled and driven by a drive motor.

13. The cooking preparation device according to claim 12, wherein: The input shaft is formed on the first rotating hub (31).

14. A cooking preparation device according to any one of claims 1 to 11, wherein: The drive device (30) comprises at least one drive motor engaged with the first rotating hub (31) and the second rotating hub (32), and wherein the drive device (30) preferably comprises a single drive motor engaged with the first rotating hub (31) and the second rotating hub (32).

15. A culinary preparation device according to any one of claims 8 to 14 as appended to claim 7, wherein: The removable cup (35) comprises the drive means (30).

16. A culinary preparation device according to claim 15 when appended to claim 14, wherein: The removable cup (35) forms part of a housing containing at least one drive motor.

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