FR3048600A1 - MIXING FOOT COMPRISING A COUPLING FLANGE FOR ITS REMOVABLE MOUNTING ON A MOTOR HOUSING - Google Patents

Abstract

Mixing foot (1) comprising a coupling flange (3) allowing its removable mounting on a motor housing and comprising a shaft (2) enclosing a drive shaft (10) comprising an upper end intended to be rotated by the motor housing and a lower end on which is fixed a working tool (5), the collar (3) being secured to the shaft (2) by being interlocked at an upper end of the shaft (2), characterized in that that the barrel (2) comprises a metal body (6) comprising at least one fastening tongue (61) which is bent against the flange (3) to improve the tear strength of the flange (3) relative to the barrel (2).

Description

MIXING FOOT COMPRISING A COUPLING FLANGE FOR ITS REMOVABLE MOUNTING ON A MOTOR HOUSING

The present invention relates to the general technical field of household blenders diving type and more particularly relates to a mixing stand for grinding food materials immersed in a liquid.

Such mixing stands are well known and commonly used. They are usually removably coupled to a housing containing a motor and include a mixing tool integral with a shaft whose upper end is coupled to an output shaft of the engine. Driven at high speed, the tool is dipped inside the food to be prepared and it cuts, mixes, emulsifies, etc.

It is known from document CN202341837U, a mixing stand comprising a coupling flange for its removable mounting on a motor housing, the mixing stand comprising a drum, integral with the flange, enclosing a drive shaft comprising an upper end intended to be rotated by the motor housing and a lower end on which is fixed a work tool. In this document, the flange is assembled by interlocking at an upper end of the barrel.

However, this document does not describe how the flange is immobilized axially on the upper end of the barrel and in particular how the tear resistance of the flange is obtained.

Thus, the following invention aims to provide a mixing foot in which the collar has a good resistance to tearing and which is simple and economical to achieve. To this end, the subject of the invention is a mixing stand comprising a coupling flange allowing its removable mounting on a motor housing and comprising a shaft enclosing a drive shaft comprising an upper end intended to be rotated by the motor housing and a lower end on which is fixed a working tool, the collar being secured to the barrel being assembled by interlocking at an upper end of the barrel, characterized in that the barrel comprises a metal body comprising at least one tongue of fixation which is bent against the flange to improve the resistance to tearing of the flange relative to the barrel.

Such a mixing stand has the advantage of being robust, having a metal enhancing aspect, and of being extremely simple to assemble. In particular, the attachment of the flange on the upper end of the barrel by the simple plastic deformation of the metal fastening tabs has both the advantage of being very simple to achieve and to ensure a good resistance to tearing of the collar.

According to another characteristic of the invention, the flange comprises an open upper end for coupling the mixing foot to the motor housing and a lower end closed by a wall adjacent the metal body, the fixing tongue being applied against the wall. of the collar.

According to yet another characteristic of the invention, the wall supports a coupling sleeve which is introduced into the upper end of the barrel.

Such a characteristic makes it possible to improve the radial holding of the flange on the shaft of the mixing foot.

According to another characteristic of the invention, the coupling sleeve comprises longitudinal ribs in relief.

Such a characteristic makes it possible to have a tight fit of the coupling sleeve in the upper end of the barrel without having too much insertion force.

According to another characteristic of the invention, the flange comprises a groove in which the upper end of the metal body is engaged.

Such a characteristic makes it possible to reinforce the resistance of the flange to twisting forces.

According to another characteristic of the invention, the flange comprises at least one slot in which the fastening tongue is introduced.

According to another characteristic of the invention, the fastening tongue forms an angle of more than 45 ° with the longitudinal axis of the mixing foot.

Such a characteristic makes it possible to improve the tear resistance.

According to yet another characteristic of the invention, the flange comprises a body made of plastic material to which is attached a metal casing.

Such a characteristic makes it possible to obtain at the same time a flexibility in the shapes of the collar, thanks to the possibilities offered by the molding of plastic materials, and a metallic aspect that enhances.

According to yet another characteristic of the invention, the barrel is tubular. The invention also relates to a household appliance comprising a housing enclosing an electric motor, characterized in that the apparatus comprises a mixing stand as previously described. The invention also relates to a method of assembling a mixing stand as described above wherein the barrel is attached to the collar by plastically deforming at least one fastening tab.

The aims, aspects and advantages of the present invention will be better understood from the following description of a particular embodiment of the invention, presented by way of nonlimiting example, with reference to the appended drawings. in which: - Figure 1 is a side view of a household mixer provided with a mixing foot according to a particular embodiment of the invention; FIG. 2 is an exploded perspective view of the mixing stand of FIG. 1; - Figure 3 is a sectional view of the mixing foot of Figure 1 along its longitudinal axis; - Figure 4 is a detail view, in section, of the mixing foot according to a section plane passing through the two fastening tongues of the metal body;

Only the elements necessary for the understanding of the invention have been represented. To facilitate the reading of the drawings, the same elements bear the same references from one figure to another.

Note also that, in this document, the terms "lower", "upper", "high", "low" used to describe the mixing pad refer to this mixing stand in use situation when it is arranged vertically with its protective bell pointing down.

FIG. 1 shows a household mixer comprising a housing 100 enclosing a motor 101, shown diagrammatically in dotted lines, arranged along the longitudinal axis X of the housing, the motor 101 having an output shaft provided at its lower end with a rotary drive 102 protruding outside the housing 100.

The household mixer comprises a mixing stand 1 comprising a tubular shaft 2 having an upper end integral with a coupling flange 3 for the removable mounting of the mixing stand 1 on the casing 100, in a position in which the cask 2 s extends coaxially with the X axis, and a lower end secured to a protective bell 4 having an open bottom end.

According to FIGS. 2 to 3, the shaft 2 encloses a drive shaft 10 comprising an upper end intended to be rotated by the rotary driver 102 and a lower end on which is fixed a working tool 5 arranged substantially in the center of the protection bell 4.

The protection bell 4 comprises a peripheral wall whose inner surface forms, in a manner known per se, a substantially closed mixing chamber around the working tool 5 when the protective bell 4 is applied against the bottom of a container , the protective bell 4 having openings 40 for the circulation of food between the inside and the outside of the protective bell 4.

As can be seen in FIG. 3, the barrel 2 comprises a metal body 6 of circular section, advantageously made of stainless steel, and an end piece 7 made of plastic material, which closes the lower end of the metal body. 6.

The end piece 7 is advantageously fixed to the metal body 6 by being force-fitted therein and it comprises for this purpose a coupling sleeve 70 which comprises ribs 71, visible in Figure 2, engaging in corresponding grooves 60 formed on the inner wall of the metal body 6 to ensure the axial locking of the end piece 7 in the metal body 6.

The end piece 7 has a shoulder 72 coming to bear against the bottom of the protective bell 4 when the coupling sleeve 70 is fully fitted into the metal body 6. The end piece 7 also has a protruding portion 73, extending inside the protective bell 4, enclosing a cavity receiving a bearing 74 for guiding the drive shaft 10, this bearing 74 being introduced into the cavity through an opening provided at the end upper coupling sleeve 70.

The protruding portion 73 is traversed by the drive shaft 10 and has for this purpose an opening 73A allowing the passage of the lower end of the drive shaft 10, a lip seal 75 being advantageously arranged in the cavity between the opening 73A and the bearing 74 to ensure the seal downstream of the opening 73A and avoid the rise of food inside the barrel 2.

Preferably, the protective bell 4 is made in one piece with the metal body 6 and has a flared shape having a height of the order of 3 to 4 cm and a diameter of about 7 cm at the from its open lower end. The working tool 5 is advantageously constituted by a knife comprising four curved blades distributed at 90 ° to each other, the working tool 5 being preferentially surmounted by a fiber cutting washer 50 integral in rotation with the shaft of 10 and arranged between the working tool 5 and the end piece 7.

As can be seen in Figures 2 and 3, the drive shaft 10 comprises an annular protrusion 11 which is sandwiched between a first and a second set of washers 12, 13, the first set of washers 12 being disposed under the protrusion 11 of the drive shaft 10 and coming to bear on the upper end of the bearing 74 when the drive shaft 10 is moved downward, the second set of washers 13 being disposed at the above the protrusion 11 and coming to bear on a stop 8, which is attached to the inside of the end piece 7, when the drive shaft 10 is moved upwards.

The abutment 8 advantageously has the shape of a steel washer comprising six claws 80 fixing regularly distributed around the periphery of the washer, the claws 80 projecting outwardly and coming to anchor on the inner wall of the piece d end 7.

Preferably, the claws 80 are inclined in the order of 45 ° relative to the plane of the washer so that they deform elastically causing a reduction in the outer diameter of the stop 8 when it is introduced from above. bottom in the end piece 7 and, conversely, they deform by generating an increase in the diameter of the abutment 8 and an axial locking of the latter in the end piece 7 when a force is exerted down at the top on the stop 8.

The abutment 8 thus produced makes it possible to limit the axial displacement of the drive shaft 10 towards the inside of the mixing foot 1 by coming to block the second set of washers 13 on which the shaft protrusion 11 comes to bear. 10 when the latter tends to be moved upwards.

This avoids any risk of heating and deterioration of the lower face of the end piece 7 by friction of the fiber cutting washer 50 when the mixing leg 1 is used by applying a pressure up and down on food to mixer.

The presence of the first set of washers 12 makes it possible to axially lock the drive shaft 10 in the direction of its extraction from the mixing stand 1 and thus prevents the drive shaft 10 from falling, under the effect of particular gravity, when the mixing leg 1 is lifted vertically with the protective bell 4 facing downwards.

As can be seen in FIG. 3, the coupling flange 3 comprises a generally frustoconical body made of plastic on which is advantageously attached a metal casing 30, for example made of stainless steel, the flange 3 having one end upper open and a lower end closed by a wall 34 supporting a coupling sleeve 31.

The coupling sleeve 31 is introduced into the open upper end of the metal body 6, to ensure a rigid connection with the latter, and preferably comprises ribs 31A longitudinal, visible in Figure 2, which rub against the inner wall of the metal body 6 to ensure the radial immobilization of the coupling flange 3 on the barrel 2.

The flange 3 advantageously comprises a circular groove 32 formed at the periphery of the coupling sleeve 31, into which the upper end of the metal body 6 engages, the latter comprising two fastening tongues 61 arranged symmetrically with respect to the longitudinal axis of the mixing foot 1 and bent against the wall 34 of the collar 3.

The assembly process of the mixing stand 1 thus produced will now be described in more detail.

In a first assembly phase, the drive shaft 10 is assembled with the end piece 7. In this first assembly phase the seal 75, then the bearing 74 are introduced into the cavity of the workpiece. end 7. The first set of washers 12 is then disposed on the lower end of the drive shaft 10 and is then brought against the protrusion 11, the drive shaft 10 being then introduced into the bearing 74, by the upper end of the latter, until its lower end exits through the opening 73A of the end piece 7.

The second set of washers 13 can then be arranged on the drive shaft 10, by the upper end thereof, and the stop 8 is put in place on the upper end of the drive shaft 10. then is introduced into force in the end piece 7. The drive shaft 10 is then immobilized axially relative to the end piece 7 with the protrusion 11 which is sandwiched between the two sets of washers 12, 13.

In a next step of the assembly process, the coupling sleeve 70 of the end piece 7 is forced into the metal body 6 by the lower end of the latter, and the coupling sleeve 31 the collar is pressed tight into the metal body 6 by the upper end thereof.

According to FIG. 4, during this phase of assembly of the flange 3 on the end of the metal body 6, the two fastening tongues 61 are initially arranged along the longitudinal axis of the mixing pad 1, as this is illustrated in dashed lines in FIG. 4, and introduced into two corresponding slots 33 formed in the body of the collar 3, at the level of the groove 32.

The two fastening tabs 61 are then deformed plastically by being bent against the inner wall 34 of the collar 3, as is shown in solid lines in FIG. 4, the wall 34 of the collar 3 advantageously comprising a receiving cavity in view of each of the two fastening tabs 61 in which the fastening tab 61 engages when curved against the wall 34 of the collar 3.

Such a flap of the fastening tongues 61 against the wall 34 makes it possible to ensure axial immobilization of the flange 3 on the upper end of the metal body 6, and in particular to ensure resistance to tearing of the flange 3 greater than 20 daN.

In a last phase of the assembly process, the fiber-cutting washer 50 and the working tool 5 are assembled at the lower end of the drive shaft 10.

This gives a simple and economical mixing foot to achieve which has the advantage of having a robust metal body and easy to clean.

In particular, such a mixing pad has the advantage of having a coupling flange which is assembled simply and very economically to the metal body of the barrel. In addition, the assembly thus produced has the advantage of offering a very good resistance to tearing of the flange relative to the barrel.

This gives a robust mixing foot, having a metal enhancing, which is simple and economical to achieve.

Of course, the invention is not limited to the embodiment described and illustrated which has been given by way of example. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Thus, in an alternative embodiment not shown, the metal body may include more fastening tongues to further enhance the holding of the coupling flange on the barrel.

Claims (10)

Mixing base (1) comprising a coupling flange (3) allowing its removable mounting on a motor housing (100) and comprising a shaft (2) enclosing a drive shaft (10) comprising an upper end intended for being rotated by the motor housing (100) and a lower end on which is fixed a working tool (5), the collar (3) being secured to the shaft (2) by being interlocked at an upper end of the barrel (2), characterized in that the barrel (2) comprises a metal body (6) comprising at least one fixing tongue (61) which is bent against the flange (3) to improve the tear resistance of the flange (3) with respect to the barrel (2). 2. mixing foot (1) according to claim 1, characterized in that the flange (3) has an open upper end for coupling the mixing foot (1) to the housing (100) motor and a lower end closed by a wall (34) adjoining the metal body (6) and in that the fixing tongue (61) is applied against the wall (34) of the flange (3). 3. mixing foot (1) according to claim 2, characterized in that the wall (34) supports a coupling sleeve (31) being introduced into the upper end of the shaft (2). 4. mixing foot (1) according to claim 3, characterized in that the coupling sleeve (31) comprises longitudinal ribs (31 A) in relief. 5. mixing foot (1) according to any one of claims 1 to 4, characterized in that the flange (3) has a groove (32) in which the upper end of the metal body (6) is engaged. 6. mixing foot (1) according to any one of claims 1 to 5, characterized in that the flange (3) comprises at least one slot (33) in which the fastening tongue (61) is introduced. Mixing foot (1) according to one of Claims 1 to 6, characterized in that the fastening tongue (61) forms an angle of more than 45 ° with the longitudinal axis of the mixing stand (1). . 8. mixing foot (1) according to any one of claims 1 to 7, characterized in that the flange (3) comprises a body made of plastic on which is reported a metal casing (30). 9. Domestic appliance comprising a housing (100) enclosing an electric motor (101), characterized in that it comprises a mixing stand (1) according to any one of claims 1 to 8. 10. A method of assembling a mixing stand (1) according to any one of claims 1 to 8, characterized in that the shaft (2) is fixed to the flange (3) plastically deforming at least one tongue fixing (61).