Food preparation appliance

Abstract

Descriptive summary: The invention relates to a food preparation appliance, comprising a base (100) and a bowl assembly (200) intended to be positioned in the base (100);in which the base (100) includes a locking device (120) for the bowl assembly (200) with a locking ring (121) mounted to rotate freely and including a locking lug (122) provided to extend through a lug orifice (111) formed through the receiving surface (110), the locking lug (122) having an active locking portion (123) extending in a direction substantially parallel to the receiving surface (110), in which the bowl assembly (200) includes a locking arrangement (220) with a locking orifice (222) intended to receive the locking lug (122), the base (100) including a drive device (130) coupled to the locking device (120) and provided to drive the rotation of the locking ring (121) between a locked position and an unlocked position. Reference figure: figure 3;

Description

Title of the invention: Household food preparation appliance FIELD OF INVENTION

[0001] The present invention relates to the field of food preparation household appliances, in particular food processors, and relates more particularly to the locking of a bowl assembly onto a base of such a household appliance. STATE OF THE ART

[0002] There are different types of food preparation appliances, including appliances comprising a base and a bowl assembly mounted removable from the base.

[0003] Such household appliances, also called food processors, include means for processing food present in the bowl assembly, for example by heating and / or by mechanical action on the food.

[0004] The food processor may thus include a heating element for heating the bowl assembly. Such a heating element may be positioned in the base intended to receive the bowl assembly, and / or directly in the bowl assembly, in which case it is electrically powered by the base, for example.

[0005] Alternatively or additionally, the food processor may also be motorized, in particular with a motorized base, and include a rotating working tool positioned inside the bowl assembly to act on the food in the bowl. The rotating working tool may, for example, be used to perform chopping, kneading, mixing, or emulsifying tasks.

[0006] Depending on the models of food processors, several types of rotary working tools can be provided to perform specific tasks such as emulsions, crushed preparations, mixtures, etc.

[0007] For obvious safety reasons, it is useful to be able to lock the bowl assembly onto the base, in particular to prevent the bowl assembly from being detached from the base during a specific cooking procedure. This is especially true when the food processor is motorized, where it is necessary for the bowl to be securely attached to the processor during its operation, given the speed and torque that can be generated by the rotating working tool.

[0008] Furthermore, it is convenient to be able to remove the bowl from the robot in order, for example, to empty or clean it.

[0009] Thus, most food processors feature a locking system allowing the entire bowl assembly at the base of the robot to be alternately locked or unlocked. Description of the invention

[0010] An objective of the present invention is to provide a food preparation appliance having a locking system for the bowl assembly at the base of the appliance which is simple, particularly in terms of manufacturing the appliance, and which does not interfere with the handling and use of the appliance by a user.

[0011] An objective of the present invention is also to provide a food preparation appliance having a locking system for the bowl assembly at the base of the appliance which has a sleek and compact design, and can be easily cleaned.

[0012] An objective of the present invention is further to provide a food preparation appliance having a locking system for the bowl assembly at the base of the appliance whose operation is independent of the rest of the operation of the appliance, in particular which can be totally decoupled from other locking systems of the appliance, such as in particular the locking of the lid on the bowl assembly.

[0013] To this end, a food preparation appliance is proposed, comprising a base having a receiving surface; a bowl assembly comprising a base and a bowl intended to receive food, the base having a bottom surface and the bowl extending from the base on the side opposite the bottom surface, the bowl assembly being intended to be positioned in the base with the bottom surface of the base placed opposite the receiving surface; in which the base includes a locking device for the bowl assembly, the locking device comprising a locking ring arranged in the base under the receiving surface and mounted to rotate freely about a receiving axis perpendicular to the receiving surface, the locking ring comprising a locking lug provided to extend through a lug hole formed through the receiving surface, the locking lug having an active locking portion extending in a direction substantially parallel to the receiving surface, in which the base of the bowl assembly comprises a locking arrangement with a locking wall extending from the bottom surface, a locking orifice being provided through the locking wall, the locking orifice being intended to receive the active locking portion of the locking lug, the base comprising a drive device coupled to the locking device and intended to drive the rotation of the locking ring between a locked position where the active locking portion of the locking lug is inserted into the locking orifice of the locking arrangement to lock the bowl assembly onto the base, and an unlocked position in which the bowl assembly can be moved relative to the base.

[0014] Some preferred but not limiting aspects of this household appliance, taken alone or in combination, are as follows: - the locking arrangement includes a locking cavity extending inwards from the bottom surface of the bowl assembly, the locking cavity being partly formed by the locking wall in which the locking orifice is provided. - the base includes a projecting protective housing extending outwards from the receiving surface, the protective housing being intended to be received in the locking cavity in the locked position. - the protective housing is designed to receive the locking lug so that in the unlocked position the locking lug is fully housed inside the protective housing, and in the locked position the active locking portion of the locking lug extends at least partially outwards from the protective housing into the locking orifice. - the locking wall in which the locking orifice is provided extends inwards from the bottom surface of the bowl assembly at an angle not perpendicular to the bottom surface of the bowl assembly. - the locking arrangement includes a projecting element extending outwards from the bottom surface of the bowl assembly, the projecting element being partly formed by the locking wall in which the locking orifice is provided, and in which the receiving surface includes a locking cavity extending inwards from the base and having a shape intended to receive the projecting element, the lug orifice being provided in a wall of the locking cavity extending from the receiving surface. - the locking ring is also mounted in translation along the receiving axis. - the locking device further includes a sliding support designed to control the translation of the locking ring, the locking ring being mounted against the support of sliding and designed to slide against the sliding support during a rotation of the locking crown. The sliding support includes a shape designed to guide the locking crown in an inward direction of the base when moving from the unlocked to the locked position of the locking crown, and to guide the locking crown in an outward direction of the base when moving from the locked to the unlocked position of the locking crown. The locking crown comprises several locking lugs, each locking lug being intended to cooperate with a respective locking orifice provided through the locking wall of the base of the bowl assembly. the base includes a receiving cavity with a bottom forming the receiving surface, the bowl assembly being intended to be positioned in the receiving cavity of the base, the receiving cavity and the base of the bowl assembly including anti-misfit elements cooperating to permit only one positioning of the bowl assembly in the receiving cavity of the base. The error-proofing elements include flats formed respectively on the side walls of the receiving cavity and the base of the bowl assembly. The household appliance further includes a device for detecting the presence of the bowl assembly on the base, the detection device comprising electronic and / or mechanical sensors to detect the presence of the bowl assembly on the receiving surface of the base. The appliance also includes a control device configured to operate the drive device only when the bowl assembly is positioned on the receiving surface of the base. The household appliance further includes a means of switching the appliance on and a means of activating a cooking preparation, the control device being configured to move the locking ring from the unlocked position to the locked position when activating a cooking preparation. The control device is configured to move the locking ring from the locked position to the unlocked position when a cooking process is stopped. the drive device includes a separate drive motor from a motor provided in the base for food preparation. DESCRIPTION OF THE FIGURES

[0015] Other features and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting and should be read in conjunction with the accompanying drawings, on which: - Fig. 1 is a perspective view of a household appliance having a bowl assembly intended to be received in a base; - Fig. 2 is a perspective view illustrating the positioning of the base locking device relative to the base receiving cavity in which the bowl assembly is positioned; - Fig. 3 is an exploded perspective view of the locking device, receiving cavity and bowl assembly of Fig. 2; - Fig. 4 is a perspective view from below of the bowl assembly; - Figure 5 is a top perspective view of the receiving cavity of the base ; - Fig. 6 is a perspective view of the locking crown of the locking device; - Fig. 7 is a cross-sectional view illustrating the bowl assembly positioned in the receiving cavity of the base, in the unlocked position; - Fig. 8 is a cross-sectional view illustrating the bowl assembly positioned in the receiving cavity of the base, in the locked position; - Fig. 9 is a view illustrating the cooperation of the locking crown with respect to the sliding support, in the unlocked position; - Fig. 10 is a view illustrating the cooperation of the locking crown with respect to the sliding support, in the unlocked position. DETAILED DESCRIPTION OF THE INVENTION

[0016] Figure 1 illustrates a household appliance which is intended in particular for the preparation of food and includes a base 100 on which a set of bowls 200 can be positioned.

[0017] The base 100 comprises a receiving surface 110 on which the bowl assembly 200 is intended to be placed. The base 100 comprises a receiving axis R orthogonal to the receiving surface 110 illustrated in [Fig. 2], such receiving axis R being positioned substantially at the center of the receiving surface 110 and coinciding with a central longitudinal axis of the bowl assembly 200 when the latter is in position in the base 100.

[0018] According to the example illustrated in [Fig.1], the receiving surface 110 constitutes the bottom of a receiving cavity 101 formed in the base 100 and intended to receive the bowl assembly 200.

[0019] As illustrated in [Fig. 3], the bowl assembly 200 comprises a base 210 and a bowl 250 for receiving food. The base 210 has a bottom surface 211 intended to be positioned opposite the receiving surface 110 of the base 100 when the bowl assembly 200 is positioned in the base 100.

[0020] The bowl 250 extends from the base 210 on the side opposite the bottom surface 211. It includes an opening at the top allowing the bowl 250 to be filled with food, for example. A lid (not shown) can be used to close this opening in order to enclose the contents of the bowl, particularly when the appliance is to be operated.

[0021] A specific locking system is also provided which secures the positioning of the bowl assembly 200 on the receiving surface 110 of the base 100.

[0022] The base 100 thus includes a locking device 120 intended to allow locking of the bowl assembly 200 onto the base 100. More specifically, the locking device 120 is intended to cooperate with a particular locking arrangement 220 of the bowl assembly 200.

[0023] According to the proposed arrangement, the locking device 120 includes a locking ring 121 arranged in the base 100 under the receiving surface 110.

[0024] Such a locking ring 121 is mounted to rotate about an axis of rotation which corresponds to the receiving axis R perpendicular to the receiving surface 110.

[0025] As illustrated in [Fig.6], the locking ring 121 includes at least one locking lug 122 which is intended to extend through a lug orifice 111 provided through the receiving surface 110. In the example illustrated in the figures, the locking ring 121 includes two locking lugs 122, which allows not only better locking of the bowl assembly 200 on the base 100, but also better balancing.

[0026] Each locking lug 122 has an active locking portion 123 extending in a direction substantially parallel to the receiving surface 110. As will be seen later, such an active locking portion 123 makes it possible in particular to lock the bowl assembly 200 on the base 100 by preventing a translation along the receiving axis R, that is to say in particular a withdrawal of the bowl assembly 200 from the base 100.

[0027] Such locking lugs 122 have for example a shape of hooks mounted on the locking ring 121, as shown in [Fig.6].

[0028] As illustrated in Figures 4, 7 and 8, the base 210 of the bowl assembly 200 comprises a locking arrangement 220 with a glass wall rusting 221 extending from the bottom surface. This locking wall 221 includes a locking orifice 222 which is preferably through, and which is intended to receive the active locking portion 123 of the locking lug 122.

[0029] It is the rotary movement of the locking ring 121 relative to the bowl assembly 200 that allows the locking or unlocking of the bowl assembly 200 relative to the base 100.

[0030] Preferably, the base 100 includes a drive device 130 which is coupled to the locking device 120 and intended to drive the rotation of the locking ring 121.

[0031] Such a drive device 130 preferably comprises a drive motor separate from the motor that would be provided in the base 100 to drive a cutting tool, for example, for food preparation. It may be in the form of a motor, a geared motor, or an electromagnet, for example.

[0032] The locking ring 121 can in particular be rotated between a locked position where the bowl assembly 200 is secured on the base 100 and cannot be removed from this base 100 in particular, and an unlocked position in which the bowl assembly 200 can be moved relative to the base 100.

[0033] According to the proposed arrangement, in the locked portion the active locking portion 123 of the locking lug 122 is inserted into the locking orifice 222 of the locking arrangement 220 and thereby locks the bowl assembly 200 onto the base 100. In particular, any translational movement along the receiving axis R is prevented and the bowl assembly 200 cannot therefore be removed.

[0034] Preferably, the locking arrangement 220 includes a locking cavity 224 extending inwards from the bottom surface 211 of the bowl assembly 200, one of the walls of the locking cavity 224 being formed by the locking wall 221 shown above.

[0035] According to a preferred embodiment and as illustrated in [Fig.5], the base 100 includes a protective cover 112 projecting outwards from the receiving surface 110 of the base 100. Such a protective cover 112 is intended to be received in the locking cavity 224 when the bowl assembly 200 is positioned on the receiving surface 110 of the base 100.

[0036] Preferably, the protective housing 112 has a shape complementary to the locking cavity 224. Such an arrangement with complementary shapes makes it possible to prevent any movement in a plane parallel to the receiving surface 110 of the base 100. This makes it possible in particular to prevent a rotation of the bowl assembly 200 relative to the base along the receiving axis R.

[0037] Such a protective housing 112 is formed to protect the locking lug 122, particularly when the locking system is in the unlocked position and the The receiving surface 110 of the base 100 is left free, especially when there is no bowl assembly 200 positioned on the base 100. Thus, in the unlocked position, the locking lug 122 is fully housed inside the protective housing 112.

[0038] The lug orifice 111 is preferably provided through a side wall of the protective housing 112, so that in the locked position, the active locking portion 123 of the locking lug 122 can extend at least partially outwards from the protective housing 112 in order to enter the locking orifice 222.

[0039] According to the embodiment illustrated in [Fig. 4], the locking wall 221, in which the locking orifice 222 is provided, extends inwards from the bottom surface 211 of the bowl assembly 200. Preferably, such a locking wall 221 extends at an angle, i.e., it is not perpendicular to the bottom surface 211 of the bowl assembly 200. If the protective housing 112 has a complementary shape, then it also includes an inclined wall having, in particular, the lug orifice 111.

[0040] Such an arrangement with an inclined locking wall 221 has several advantages. First, it allows for the formation of a keying shape, thus facilitating the positioning of the bowl assembly 200 on the base 100. Furthermore, it allows the pull-out forces to be directed as close as possible to the most rigid part of the active locking portion 123 of the locking lug 122.

[0041] Preferably, the active locking portion 123 of the locking lug 122 also has an inclined wall, as illustrated in [Fig. 6]. According to such an arrangement, when the locking system is in the unlocked position, the inclined wall of the active locking portion 123 of the locking lug 122 can be positioned in line with the inclined wall of the protective housing 112. Such an arrangement with an inclined wall of the active locking portion 123 of the locking lug 122 is also advantageous in that the locking by the active locking portion 123 is operational as soon as the locking lug 122 begins to be deployed from the lug opening 111 into the locking opening 222.

[0042] According to an alternative embodiment not shown, the configuration is reversed. Thus, the locking arrangement 220 comprises a projecting element extending outwards from the bottom surface 211 of the bowl assembly 200, such a projecting element being partly formed by the locking wall 221 in which the locking orifice 223 is provided. According to this configuration, the receiving surface 110 may comprise a locking cavity extending inwards from the base 100 and having a shape designed to receive the projecting element, the lug orifice 111 being then provided in a wall of the locking cavity extending from the receiving surface 110. In such a case, the protruding elements extending outwards from the bottom surface 211 of the bowl assembly 200 can serve as feet to place the bowl assembly 200 on a resting surface.

[0043] Advantageously, but optionally, the locking ring 121 is mounted to move in translation about the receiving axis R. In this way, the locking lug 122 can be moved not only by rotation about the receiving axis R but also by translation along this receiving axis R. This allows control of the axial positioning of the locking lug 122 relative to the locking orifice 222. Thus, there may be some play between the locking lug 122 and the locking orifice 222 during the transition between the unlocked and locked positions (or vice versa), which facilitates the movement of the locking lug 122, but it is preferable that this play be completely absent when the locking system is in the locked position.Thus, in the locked position, the locking lug 122 is preferably positioned to be pressed against the locking wall 221 as shown in [Fig.8], which completely eliminates any possibility of translational movement along the receiving axis R.

[0044] According to an embodiment illustrated in the figures, the locking device 120 includes a sliding support 125 provided for controlling the translation of the locking ring 121. Preferably, the locking ring 121 is mounted against the sliding support 125 and is designed to slide against the sliding support 125 during rotation of the locking ring 121. For this purpose, a tension spring 127 may, for example, be provided to act against the locking ring 121.

[0045] The sliding support 125 therefore has a shape designed to control the axial positioning (along the receiving axis R) of the locking ring 121 and thus of the locking lug 122. The sliding support 125 preferably also takes the form of a ring, allowing better cooperation with the locking ring 121.

[0046] The sliding support 125 preferably has a shape designed to guide the locking ring 121 in a direction towards the inside of the base 100 when moving from the unlocked position to the locked position of the locking ring 121. Thus, this allows the locking lug 122 to be positioned against the locking wall 221 for example.

[0047] The sliding support 125 preferably has a shape also designed to guide the locking ring 121 outwards from the base 100 when moving from the locked position to the unlocked position of the Locking crown 121. This allows, for example, the locking lug 122 to be positioned in the center of the locking hole 222 when switching from the locked to the unlocked position or vice versa. This prevents the movement of the locking lug 122 from being obstructed.

[0048] As illustrated in figures 9 and 10, the sliding support 125 may for example have one or more projecting sliding portions 126 provided to cooperate with sliding grooves 124 provided in the locking ring 121.

[0049] Figure 9 illustrates the interaction of the locking ring 121 with the sliding support 125 in the unlocked position. In this position, each projecting sliding portion 126 of the sliding support 125 comes at least partially inside one of the sliding grooves 124 formed in the locking ring 121, which allows the locking ring 121 to be close to the sliding support 125. In other words, the locking ring 121 tends to be displaced axially outwards, which pushes the locking lug 122 also axially outwards from the base 100.

[0050] Figure 10 illustrates the interaction of the locking ring 121 with the sliding support 125 in the locked position. In this position, the projecting sliding portions 126 of the sliding support 125 are no longer in the sliding grooves 124 formed in the locking ring 121, thus maintaining a distance between the locking ring 121 and the sliding support 125. In other words, the locking ring 121 tends to be displaced axially inwards, which also pushes the locking lug 122 axially inwards towards the base 100. In this locked position, the locking lug 122 is preferentially constrained against the locking wall 221, this constraint being due in particular to the projecting sliding portions 126 pushing the locking ring 121 towards the base 100 (inwards).

[0051] As mentioned above, the receiving surface 110 can form the bottom of a receiving cavity 101 provided in the base 100 and intended to receive the bowl assembly 200.

[0052] According to a preferred embodiment, the receiving cavity 101 of the base 100 and the base 210 of the bowl assembly 200 include keying elements 115, 215 cooperating to allow only one positioning of the bowl assembly 200 in the receiving cavity 101 of the base 100.

[0053] As illustrated in figures 1 and 4, such error-proofing elements 115, 215 may include flats formed respectively on the side walls of the receiving cavity 101 of the base 100 and the base 210 of the bowl assembly 200.

[0054] Such keying elements 115, 215 facilitate the placement of the bowl assembly 200 in the receiving cavity 101 of the base 100, and also allow ensure that the elements forming the locking system will be correctly positioned to cooperate without obstruction.

[0055] According to a preferred embodiment, the proposed household appliance includes a device for detecting the presence of the bowl assembly 200 on the base 100. Such a detection device may, for example, include electronic and / or mechanical sensors for detecting the presence of the bowl assembly 200 on the receiving surface 110 of the base 100.

[0056] Such a presence detection device can be particularly advantageous if it is desired that the proposed locking system can only function if the bowl assembly 200 is correctly positioned on the base 100.

[0057] Indeed, it may also be provided that a control device is configured to control the drive device 130 only when the bowl assembly 200 is correctly positioned on the receiving surface 110 of the base 100.

[0058] According to another preferred embodiment, the appliance also includes a means for switching the appliance on and a means for activating a cooking program, the control device being configured to move the locking ring 121 from the unlocked position to the locked position when a cooking program is activated. Conversely, the control device can be configured to move the locking ring 121 from the locked position to the unlocked position when a cooking program is stopped.

[0059] A possible operation of the food preparation appliance is now described, in particular with regard to the locking and unlocking of the bowl assembly 200 on the base 100.

[0060] In a first step, the bowl assembly 200 is placed on the receiving surface 110 of the base 100, and an electrical connection is made between the two elements, for example by means of a pin system. The electronics of the household appliance then detect the presence of the bowl assembly 200.

[0061] When inserting or removing the bowl assembly 200 from the base 100, the locking system, and in particular each locking lug 122, is positioned as shown in [Fig. 7] in the unlocked position. In this unlocked position, the locking lugs 122 are housed inside the corresponding protective covers 112. Thus, not only do they not impede the movement of the bowl assembly 200 from the base 100, but the receiving surface 100 is also free of any obstruction.

[0062] In a second step, for example when a recipe is launched by the user, and depending on the response of the first step (electronics that detect the presence or absence of the bowl assembly 200), information is sent to the motorization sub-assembly of the locking system 120, which actuates the locking ring. rusting 121 to move in translation the locking lugs 122.

[0063] The locking lugs 122, for example in the form of hooks, are inserted into the locking holes 222 of the bowl assembly 200, as illustrated in [Fig. 8]. The bowl assembly 200 is thus clamped onto the motor block of the base 100. Indeed, any movement along the receiving axis R is prevented by the interaction between the locking lugs 122 and the locking holes 222 of the bowl assembly 200. Furthermore, movement along a plane parallel to the receiving surface 110 of the base 100 and rotation about the receiving axis R are prevented by the specific shapes of the protective covers 112 and the corresponding locking cavities 224.

Claims

Demands

1. Food preparation appliance comprising a base (100) having a receiving surface (110); a bowl assembly (200) comprising a base (210) and a bowl (250) intended to receive food, the base (210) having a bottom surface (211) and the bowl (250) extending from the base (210) on the side opposite the bottom surface (211), the bowl assembly (200) being intended to be positioned in the base (100) with the bottom surface (211) of the base (210) placed opposite the receiving surface (110); wherein the base (100) comprises a locking device (120) for the bowl assembly (200), the locking device (120) comprising a locking ring (121) arranged in the base (100) under the receiving surface (110) and mounted to rotate about a receiving axis (R) perpendicular to the receiving surface (110), the locking ring (121) comprising a locking lug (122) provided to extend through a lug hole (111) formed through the receiving surface (110), the locking lug (122) having an active locking portion (123) extending in a direction substantially parallel to the receiving surface (110), wherein the base (210) of the bowl assembly (200) comprises a locking arrangement (220) with a locking wall (221) extending from the surface of bottom, a locking hole (222) being provided through the locking wall (221),the locking orifice (222) being intended to receive the active locking portion (123) of the locking lug (122), the base (100) comprising a drive device (130) coupled to the locking device (120) and intended to drive the rotation of the locking ring (121) between a locked position where the active locking portion (123) of the locking lug (122) is inserted into the locking orifice (222) of the locking arrangement (220) to lock the bowl assembly (200) onto the base (100), and an unlocked position in which the bowl assembly (200) can be moved relative to the base (100).

2. A household appliance according to claim 1, wherein the locking arrangement (220) comprises a locking cavity (224) extending inward from the bottom surface (211) of the bowl assembly (200), the locking cavity (224) being partially formed by the locking wall (221) in which the locking orifice (223) is provided.

3. Household appliance according to claim 2, wherein the base (100) comprises a projecting protective housing (112) extending outwards from the receiving surface (110), the protective housing (112) being intended to be received in the locking cavity (224) in the locked position.

4. Household appliance according to claim 3, wherein the protective housing (112) is provided to receive the locking lug (122) such that in the unlocked position the locking lug (122) is fully housed inside the protective housing (112), and in the locked position the active locking portion (123) of the locking lug (122) extends at least partially outwards from the protective housing (112) into the locking orifice (222).

5. Household appliance according to any one of claims 2 to 4, wherein the locking wall (221) in which the locking orifice (222) is provided extends inwards from the bottom surface (211) of the bowl assembly (200) in an inclined manner not perpendicular to the bottom surface (211) of the bowl assembly (200).

6. Household appliance according to claim 1, wherein the locking arrangement (220) comprises a projecting element extending outwards from the bottom surface (211) of the bowl assembly (200), the projecting element being partly formed by the locking wall (221) in which the locking orifice (223) is provided, and wherein the receiving surface (110) comprises a locking cavity extending inwards from the base (100) and having a shape intended to receive the projecting element, the lug orifice (111) being provided in a wall of the locking cavity extending from the receiving surface (110).

7. Household appliance according to any one of claims 1 to 6, wherein the locking ring (121) is further mounted in translation along the receiving axis (R).

8. Household appliance according to claim 7, wherein the locking device (120) further comprises a sliding support (125) provided for controlling the translation of the locking ring (121), the locking ring (121) being press-fitted against the sliding support and provided for sliding against the sliding support (125) during a rotation of the locking ring (121).

9. Household appliance according to claim 8, wherein the sliding support (125) comprises a form provided to guide the locking ring (121) in a direction towards the inside of the base (100) when moving from the unlocked position to the locked position of the locking ring (121), and to guide the locking ring (121) in a direction towards the outside of the base (100) when moving from the locked position to the unlocked position of the locking ring (121).

10. Household appliance according to any one of claims 1 to 9, wherein the locking ring (121) comprises several locking lugs (122), each locking lug (122) being intended to cooperate with a respective locking orifice (222) provided through the locking wall (221) of the base (210) of the bowl assembly (200).

11. Household appliance according to any one of claims 1 to 10, wherein the base (100) comprises a receiving cavity (101) with a bottom forming the receiving surface (110), the bowl assembly (200) being intended to be positioned in the receiving cavity of the base (100), the receiving cavity (101) and the base (210) of the bowl assembly (200) comprising keying elements (115, 215) cooperating to permit only one positioning of the bowl assembly (200) in the receiving cavity (101) of the base (100).

12. Household appliance according to claim 11, wherein the error-proofing elements (115, 215) comprise flats formed respectively on the side walls of the receiving cavity and the base (210) of the bowl assembly (200).

13. Household appliance according to any one of claims 1 to 12, further comprising a device for detecting the presence of the bowl assembly on the base, the detection device comprising electronic and / or mechanical sensors for detecting the presence of the bowl assembly (200) on the receiving surface (110) of the base (100).

14. Household appliance according to any one of claims 1 to 13, further comprising a control device configured to control the drive device (130) only when the bowl assembly (200) is positioned on the receiving surface (110) of the base (100).

15. Household appliance according to claim 14, further comprising a means for switching on the appliance and a means for activating a cooking preparation, the control device being configured to move the locking ring (121) from the unlocked position to the locked position when activating a cooking preparation.

16. Household appliance according to claim 15, wherein the control device is configured to move the locking ring (121) from the locked position to the unlocked position when a cooking process is stopped.

17. Household appliance according to any one of claims 1 to 16, wherein the drive device (130) comprises a drive motor separate from a motor provided in the base (100) for food preparation.

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