DE102010015925A1 - Container, particularly mixing bowl for food processor, has cover that is fixed at container such that cover is not opened in determined condition by human force - Google Patents

Abstract

The container (7) has a cover (11) that is fixed at the container such that the cover is not opened in a determined condition with human force. The container or the cover has an electrical supply and a locking device that is formed in an electromagnetic manner. A conclusion element (24) is provided with individual components. The individual components are provided in locking direction (a) in moving manner.

Description

The invention relates to a container, such as. A stirred pot of a food processor, with a lid, wherein the lid can be fixed to the container, so that it is not open in the fixed state with human power, wherein further the container and / or the lid has an electrical supply and the lock is formed electromagnetically, wherein a return element consists of individual elements.

Containers of the type in question are known. These are used, in particular, in the household sector for receiving foodstuffs, and further, for example, food or fluids, for example, in an embodiment of the containers as stirrers for a food processor or else in the form of a boiling water appliance. In addition, containers are known in this respect, for the storage of solid, liquid or pasty masses. Such containers are for the protection of the contents or even, as in the case of the embodiment of the container as a stirred pot for a food processor or further example. As a cooking water device, lid-sealed to protect against leakage of media located in the container. Such covers are preferably attachable to the container so that they are not to be opened by human force in the fixed state without further aids, such as. Levers or other mechanical or electrical release means. Thus, the lid closure of the container is ensured in particular in an operating state of the container. By fixing an example. Accidental opening or removal of the lid by the user is not possible. For this purpose is further in containers and / or lids having an electrical supply, known to form this lock electromagnetically, wherein either the container or the lid has a preferably switched on and off electromagnet and the counterpart cooperating with the electromagnet in the on state inference element. In this regard, will continue to the DE 1 164 772 A1 referenced, from which a previously described embodiment of a container is known. It is also known from this German patent application to arrange the return element distributed peripherally, so that accordingly the return element composed of individual elements.

In view of the above-described prior art, a technical problem of the invention is seen in further improving a container of the type in question with respect to the electromagnetic locking of the lid to the container.

This problem is solved first and foremost by the subject matter of claim 1, wherein it is based on the fact that movable individual elements are provided in the closing direction. The container is closed according to the invention by a lid utilizing magnetic forces. In this case, initially a permanent magnet may be provided, for which purpose, in particular for lifting the cover, the human force acting on the cover, for example, is translated according to a lever arrangement. Preferably, the forces are switchable so as to allow a force-free lifting and placing the lid. Accordingly, an electromagnetic lock is preferably used. Accordingly, preferably no preparatory or supporting actions for closing or opening are necessary. Further, according to the magnetic, in particular electromagnetic locking, the lid is preferably non-directional and largely force-free on the container can be placed without predefined and guided rotational, pushing or pushing movements are necessary. Also, with a corresponding electromagnetic lock on a mechanical actuator or the like, which must be operated by the user, be waived because the triggering or cancellation of the lock is done electrically. The handling of the container, especially in combination with liquid, solid and pasty substances, requires from the lid lock the highest possible insensitivity to contamination and damage to the shutter lots. In both of the above cases, in particular, the loss of power must be limited. Further, in particular, the production and assembly of the closure components are subject to tolerances. Due to the design of the return element made of individual elements movable in the closing direction, a compensation is created which allows realistic tolerances in metal and plastic components, without the function of the locking being impaired. By separating the return element and the movable arrangement of the same in the closing direction, ie more preferably in vertical Deckelaufsetz- or Deckelabnehmrichtung, an extensive surface contact of the two locking partners is ensured, resulting in a perfect magnetic lock. Corresponding to the physical, quadratic dependence of the force development on the air gap width in the magnetic circuit, these attractive forces decrease very rapidly as the air gap increases due to foreign bodies or misplacements of the cover. The maximum achievable holding force is dependent on the tolerance dimensions of the iron core and the gap freedom of the resulting positive connection between the magnetic core and the return element. Due to the separation of the return element and the movable arrangement of the individual elements formed therefrom, production and assembly tolerances, which lead to dimensional deviations, waviness, distortion and angular errors on the components, not the positive connection. In addition, according to the proposed solution, damage to the closure partners in the interaction region, which lead to form errors and thus increased air gaps, can be compensated. Magnetic circuits are highly dependent on the width of the air gap between the electromagnet and the return element. Even distances of the order of about 0.1 mm lead to a very significant decrease of the attractive forces. For this reason, there is a high dependence on a good fit between the two joining partners and the need to exclude any disturbing bodies and foreign layers between them. This is achieved by the movable in the closing direction arrangement of the individual elements of the return element, so that at any lying between the joining partners disturbing bodies that partially increase the air gap to an impermissible extent, at least over the wider circumference, according to the individual elements movable in the closing direction a direct contact with the associated joining partner can be achieved. In a preferred embodiment, switchable forces in the range of several hundred Newtons, in particular from 200 to 1,300 N, can be achieved by the electromagnetic shutter.

Further features of the invention are explained below, also in the description of the figures, often in their preferred association with the subject matter of claim 1 or with features of further claims. But they can also be in an assignment to only individual features of claim 1 or the respective further claim or each independently of importance.

Thus, more preferably, the mobility of a single element of the return element is achieved by a resilient suspension. This offers in particular a mobility of the individual element in the closing direction, d. H. more preferably in the case of a horizontally aligned locking plane, a mobility in the vertical direction. In addition, according to the spring suspension also preferably in addition to the vertical mobility possibly reduced with respect to the vertical mobility mobility of the individual elements in the horizontal direction possible, further possibly also a mobility of the individual elements in the manner of a tilting movement. Likewise, due to the movable arrangement of the individual elements, in particular resilient suspension, an individual adaptation, preferably a vertical adaptation of the individual elements can be achieved, so that interference particles or the like which in particular partially lie in the closure plane between the closure partners do not influence the drop of the attraction forces over the entire effective range, but rather only partially directly on the single element effective here, while the other individual elements of the return element can preferably come into contact over the whole area. The resilient suspension can be structurally solved by arranging springs, for example, the individual elements holding spring arms. It is preferred in this context that the resilient suspension is achieved by embedding the individual elements in an elastic material. Thus, for example, the individual elements in the region of a fixing section of the same can be extrusion coated with a highly flexible potting compound or a region which receives the connection region of the individual elements can be filled with such a mass. In this regard, for example, a highly flexible plastic is used. Also, the sole connection of the individual element to the container or to the lid can be achieved via such a highly flexible plastic.

In a further preferred embodiment, the closure state can be checked by measuring the inductance. It is achieved as a system-integrated detection of the lid using a measurement of the inductance of the electromagnet. Thus, the coil of the electromagnet without return element, d. H. when the lid is not attached, an inductance of about 40-80 mH, preferably 60 mH, on. This value increases with loose but not necessarily correctly positioned lid to about 90-120 mH, preferably 100 mH. Only when the lid has been fully positioned and tightened does the final inductance value of the closed loop of preferably 120-150 mH, more preferably 130 mH, be reached. The above-described ranges with respect to the induction values are given by way of example only, may be selected numerically larger in further training, so for example. 20 to 150 mH with no lid, for example. 200 to 400 mH with not properly placed lid and, for example. 450 to 600 mH with correctly placed cover. In any case, the differences between these states are sufficiently large that a clear detection is possible even taking into account tolerances and external influences. Any soiling or damage in the magnetic air gap, which can lead to deformation and thus to a residual air gap, leads to a lowering of the inductance value, so that the extent of the disturbance can be assessed. For the measurement, it is preferable to use the solenoid coil charged with an AC signal. Alternatively, a so-called Maxwell bridge is provided for measuring the inductance.

In addition, at least in addition to a wired power supply, an accumulator is preferably provided for the electrical supply of the electromagnet, so that the system preferably also against the sudden failure of the network Power supply is protected. The amount of energy required to drive the electromagnet is generally not suitable for buffering in capacitors, so that the integration of a rechargeable battery with charging circuit and condition monitoring is preferred. Also, such a designated accumulator may be provided solely for electrical supply, wherein further the accumulator is integrated in the joining partner, which has the electromagnet, so on, either in the container or in the lid.

In a further preferred embodiment of the container as a stirring pot for a food processor, an agitator is further arranged in the container. The dimensioning of the holding forces between the lid and container requires in this embodiment, with activated stirrer, the secure closure of the lid or against the forces of a rotating liquid column with a volume of 0.5-3.51, more preferably a maximum of 2.71, and a height from 50 mm to 250 mm, preferably 150 mm, while this liquid column through the agitator with 1,000-15,000 U / min., More preferably max. 10,000 rpm. is driven. In addition, the pulsed bursts of particulate matter within the rotating medium must be trapped, which are thrown by the agitator against the lid. Even improper opening attempts from outside, especially by the user, while the device is in operation, must be prevented by the holding forces. Thus, it is further preferred in this context that the agitator is operable only when activated and possibly checked magnetic closure, this further preferably in response to a result of an inductance measurement. If, in this case, the inductance measured value falls below a predetermined minimum value of, for example, 110 mH stored in a control unit, then the agitator can not be activated in the stirred pot or, in the activated state, is switched off as a result of another inductance measurement also carried out in agitator operation. In the case of a solenoid, which is preferably supplied solely via an accumulator, the state of charge of the accumulator is also preferably monitored. If the state of charge falls below a predetermined minimum value, which does not further ensure the magnetic closure according to the invention, this leads, in a further preferred embodiment, to a shutdown of the agitator. As a result of the measures described above, lifting of the cover while the agitator is running or still running is counteracted.

In a preferred embodiment it is provided that the coil winding is arranged in the, the lid facing container edge of the container. Accordingly, the container is provided with an electrical supply or equipped for connection to an electrical supply, so on, for example. In training of the container as a removable stirring pot of a food processor while offering an electrical interface to the food processor or to the Rühropfaufnahme in the food processor. Further alternatively or in combination with this, an accumulator is provided in the container for the container-side coil winding. The return element or the individual elements forming the return element are correspondingly provided in the other joining partner, here in the cover, further in a cover region which, in the closed state, corresponds to the container edge. In this context, it is further preferred that the coil winding extends parallel to an opening plane of the container, this further in a preferred embodiment of the container with a circular opening area surrounding the opening area in a circular manner. In particular, in such a circular configuration of the opening surface and the peripheral edge of the container according to the proposed solution allows an undirected placing of the lid, wherein in each placement alignment an electromagnetic lock is feasible.

The electromagnet is preferably formed by a U-shaped iron core with the leg gap open towards the cover, in which leg space the coil winding is accommodated. The U-shaped iron core forms in a preferred embodiment with its radially outer U-leg at the same time the radially outer container edge. The preferably in the use state of the container vertically extending U-legs of the iron core frame the coil winding radially on the inside and outside and form in a further preferred concentric configuration of the container, in particular in the region of the opening surface two concentric rings around the container opening. The return element or the individual elements of the return element are positioned on the cover and dimensioned so that it covers with their radial extent both formed by the U-legs of the iron core pole faces. In this embodiment, the leg gap extends vertically, opening correspondingly upward in the direction of the container opening surface, wherein more preferably extend the free pole faces in a horizontal plane. In an alternative embodiment, the free pole faces extend at an acute angle to a vertical, wherein preferably an inclination of the free pole faces is provided radially outward, with corresponding outwardly facing U-opening. Alternatively, the leg gap may extend radially inwardly, including an acute angle to a vertical. The element forming the return element individual elements of the lid are positioned according to the orientation of the leg gap on the lid, so that a preferably flat contact the Individual elements can be achieved on the pole faces of the iron core. Preferably, an inclination of the free pole faces at an angle of 60 ° up to 90 ° is preferred. Here, the free pole faces of the U-legs are further inclined relative to the orientation of the leg gap, more preferably an inclination of 30 ° -60 °, preferably 45 °, to a vertical having. As a result of this inclination of the pole faces, the dimension of the respective pole face increases in comparison to perpendicularly to the extension of the leg gap extending pole faces at the same leg thicknesses. In this case, furthermore, the pole faces may extend in a common plane with respect to a cross section through the iron core or run in different planes at the same angular position. Also, the pole faces of the two U-legs of the iron core can be employed angularly different. In any case, the individual elements of the cover cooperating with the electromagnet, in particular with the U-shaped iron core, are adapted in cross-section to the full surface contact with the pole faces of the iron core.

The individual elements are more preferably removable for cleaning or replacement preferably on the lid, alternatively held on the container, more preferably by the user without tools removed. For this purpose, the single element is preferably in a radially directed form-fitting reception, so that corresponding to the removal of the individual element a Ausschubbewegung can be performed radially outward. Thus, it is further preferred in this context that each individual element has a double-T cross-section, wherein a free lower surface of a T-leg is the conclusion of the electromagnet, while the other T-legs together with the T-legs connecting T Insert web in a corresponding cross-section adapted recording. This positive reception of the individual element is dimensionally selected in the sense of the invention such that at least one holder, which is movable in the closing direction, of the received individual element is made possible. Accordingly, the recording on an excess of the cross-sectional dimensions of the individual element. For the suspension suspension of such a single element in a receptacle, for example, the gap between the receptacle and the mounting portion of the single element is ejected with a highly flexible potting compound, which further closed at the same time as well as the resilient properties given thereby cavities and sealed. In this case, the individual elements are preferably not removable. In the case of the arrangement of the individual elements in a cover this is due to the sealing effect of the highly flexible potting compound to be supplied to a total cleaning, more preferably dishwasher safe.

In a further alternative embodiment, the single element is screw-mounted on the lid or on the container. This screw is removable for cleaning the lid or the container, and also for the replacement of the individual element. In order to enable a resilient suspension even with such a screw fastening and thus to offer a movement of the individual element in the closing direction, the screw fastening is formed with the interposition of an elastic spacer sleeve or the like, which elastic spacer sleeve preferably resiliently acts on the single element in the closing direction.

In addition, it is provided that the lid has a sealing lip and that the magnetic closure is oversized with respect to a compression of the sealing lip in the closed state. The connection between the container and the lid is accordingly preferably sealed by a flexible elastomeric lip which must be forced into its final sealing seat with a bias. The force required for this purpose is preferably connected to an initial path of more than 1 mm up to 2 mm and therefore requires over-dimensioning of the electromagnet in order to reliably apply sufficient force even over this distance. In this context, an inclination of the pole faces offers relative to a vertical. This leads to a separation of the sealing gap at the container edge and the magnetic air gap. In addition, a path ratio is introduced, through which the normal distance across the magnetic poles with respect to the width of the sealing gap becomes smaller with increasing angle. This shifts to the same extent the load of the magnet of tensile forces (main force) to sliding forces.

For improved definition of the support contact, in a development, a single element has a central groove extending in the direction of the pot or cover edge, for adaptation to the end faces of the U-shaped iron core. On the remaining surfaces on both sides of the groove arise magnetic reluctance forces that seek full coverage of pole face and back surface and support the positioning of the lid. This can be further combined with additional constructive measures for centering the lid, such as stop edges or guide surfaces.

All values given are all intermediate values, in particular in 1 mm increments and / or 1 mH increments and / or 1 N increments and / or 1 rpm increments, both with respect to a single or multiple narrowing of the values specified range limits in, for example, the specified step size, from above and / or from below, as well as to represent singular values within the specified ranges are hereby included in the disclosure.

The invention with reference to the accompanying drawings, which illustrates only two embodiments, explained in more detail. It shows:

1 in a partially sectioned view of a container in the form of a stirring pot in assignment position to a food processor, a first embodiment of an electromagnetic lid lock concerning;

2 the enlargement of the area II in 1 ;

3 a view against the peripheral edge of the lid and the container edge according to arrow III in 2 ;

4 the region of the container edge and the lid in an exploded perspective view;

5 a further perspective exploded view of the arrangement according to 4 , facing the bottom of the lid;

6 the lid in bottom view;

7 a vertical section through a closed container by a lid, a second embodiment of the electromagnetic lid lock concerning;

8th the enlargement of the area VIII in 7 ;

9 the container edge of the container and the lid in a perspective exploded view;

10 a further exploded perspective view of the arrangement according to 9 but facing the bottom of the lid.

Shown and described is first with reference to 1 an electrically powered food processor 1 , This first has a control panel 2 on with regulators 3 . 4 and preferably a display 5 to display the particular on the controller 3 and 4 parameters to be set.

Furthermore, the food processor has 1 over a stirred pot holder 6 , In this is a stirring cup-like container 7 , in particular in the foot region of the same preferably receiving and retainable in a form-fitting manner.

The container 7 is preferably formed substantially rotationally symmetrical, with a central vertical axis x.

In the bottom area, the container 7 a stirrer 8th on. This is in the assignment position of the container 7 in the stirred pot holder 6 positively coupled with one in the food processor 1 provided agitator drive 9 ,

The electrical supply of the agitator drive 9 and possibly a container bottom side provided heating and beyond the electronic control of the entire food processor 1 is via a power cord 10 reached.

The container 7 is more particularly in the operation of the agitator 8th through a lid 11 locked. This preferably has central, the vertical axis x of the container 7 absorbing, a filling opening 12 on.

The lid 11 relies in the in the 1 - 6 shown first embodiment of its peripheral edge region 13 on the circumferential to the vertically upwardly facing container opening 14 extending container edge 15 from.

The container edge 15 is essentially as a U-shaped, corresponding circumferential iron core 16 formed, whose leg gap 17 extends vertically and vertically upwards towards the support plane for the lid 11 is open. In the leg gap 17 is a coil winding 18 arranged. This extends substantially parallel to an opening plane E of the container 7 which at the same time in the illustrated embodiment, the support level for the lid 11 forms.

The coil winding 18 forms together with the iron core 16 an electromagnet 19 out. To power the coil winding 18 is the container 7 electrified, including further power lines not shown by a container handle 20 are guided in the direction of the container bottom. In the area of the container bottom is an electrical interface between containers 7 and stirred pot holder 6 provided, in particular by forming a male-coupling interface, which with insertion of the container 7 in the stirred pot holder 6 closed is. Via the same interface, a resistance heater provided in the container bottom is preferably also supplied.

The electromagnet 19 is switchable. This is in the control panel 2 a switch 21 arranged. The respective state of the electromagnet 19 (switched on or off) can, for example, in the display 5 are displayed. Alternatively or in combination is also an electronic activation of the electromagnet 19 according to the current operating mode of the food processor 1 possible.

The vertical and in a cross section parallel to each other U-legs 22 of the iron core 16 run in the form of concentric rings around the container opening 14 frame the coil winding 18 radially on the inside and outside. The vertically upward free, force-generating pole faces 23 the U-legs extend transversely to the extension direction of the leg gap 17 , further forming the total support level.

In the lid edge 13 is underside, ie in the container closure condition according to 1 pointing down with the electromagnet 19 cooperating inference element 24 arranged. This consists of several, over the circumference of the lid edge 13 evenly distributed arranged individual elements 25 , whereby a segmentation of the inference element 24 is reached.

Preferably, the individual elements 25 To steel elements whose width viewed in the radial direction is chosen so that in the cap-closed state both pole faces 23 of the iron core 16 are covered.

Next, in the illustrated embodiment, the return element 24 from thirty to sixty, preferably forty-eight single elements 25 so that every single element 25 Cover edge approximately covers an angular range of 7 °.

Each individual element is located in a radially directed and radially outward, possibly for the removal of a single element 25 open positive connection 26 one. This is designed in a vertical cross-section double T-shaped. The radial depth of each positive connection 26 is adapted to the dimension of extension of a single element to be considered in the same direction 25 , more preferably, this radial dimension at least the radial distance dimension of the leg gap 17 from considered outer surfaces of the U-legs 22 of the iron core 16 corresponds to each other.

Every single element 25 is adapted to the cross-sectional design of the positive connection 26 executed double-T-shaped, according to the vertically downwardly open trained form-fitting receptacles 26 the lid closure position pointing down T-leg of a single element 25 the feedback surface offers. Over the other T-leg 28 and the two T-thighs 27 and 28 connecting T-bridge 29 an at least approximately positive fit is achieved.

The fit of the form-fitting shots 26 with the holding areas of the individual elements 25 This is chosen so that adjusts a both vertical and circumferentially considered game. So is the form fit recording accordingly 26 with an all-round excess of about 0.5-1 mm from the outer dimension of the single element 25 Mistake.

To block the individual elements 25 against a radial displacement to the outside in an embodiment, not shown, a radially outwardly facing end faces of the individual elements 25 overlapping, annular closure element provided. The individual elements are supported radially inwards 25 in one step 30 of the lid 11 from.

According to the game thus achieved, one in the closing direction (see arrow a in FIG 1 ) movable arrangement of the individual elements 25 reached. It is preferred in this regard, as further illustrated, a seal of itself between the individual elements 25 and the facing walls of the positive connection 26 adjusting gap by pouring or ejection with a highly flexible potting compound of an elastic material 31 , Through this elastic material 31 are the individual elements 25 spring-mounted in the form-fitting receptacles 26 embedded.

For sealing completion in the lid locking position is offset radially inwardly to the lid side stage 30 in the lid a circumferential sealing bead 32 intended. This lies in a circumferential groove 33 in, in which in the lid assignment position, an annular Beaufschlagungssteg 34 of the container edge 15 dips.

In one, as known from the prior art, one-piece, continuous return element remains between an analytical force calculation and a path-force measurement, a calculated residual air gap of about 50 microns. With an exemplary pole surface of about 24 cm ² , 100 turns of the coil winding and a current of 1 A, a holding force of about 1,500 N is achieved. An initial, area-wide enlargement of the air gap, for example, by disruptive bodies (for example soiling) with a vertical height of about 0.1 mm, already reduces this holding force to 350 N; a bluff with a vertical height of about 0.2 mm even to only 100 N. To the disturbing influence of any in the course of the lid closing on the container edge 15 To encounter the disturbing body located, is the return element 24 as described segmented into individual elements 25 , The Dependence on the width of the air gap is at least so far reduced by this segmentation that according to local limitation between the lid 11 and container edge 15 lying sturgeon the game of individual elements 25 is exploited, without the remaining, not impacted by disruptive individual elements 25 to influence.

The sealing bead 32 is to be drawn into its final sealing seat, overcoming its preload, to make the connection. Again, this is done with the help of the push-button or the like switchable magnetic forces. The force required for this is with an initial compression path of the sealing bead 32 connected by about 1 to 2 mm. The electromagnet 19 is correspondingly oversized to reliably apply sufficient force even over this distance.

The 7 to 10 show a second embodiment of the magnetic lock, in which a mechanical decoupling between the sealing gap and the magnetic air gap is achieved.

The container edge iron core 16 is hereby arranged so that its leg gap 17 radially outward and transverse to the vertical axis x points. The pole faces 23 the U-thigh 22 in this case extend with respect to a horizontal or with respect to an opening plane E inclined, preferably including an angle of 45 °. The pole faces 23 are here arranged in a cross section in a common plane. These, the pole faces 23 receiving level increases with respect to a cross section according to 7 starting from the lower U-leg 22 pointing in the direction of the vertical axis x.

Next is the iron core 16 arranged so that its upper and according to the above Polflächenausbildung shorter U-legs 22 with its upwardly facing, planar surface a support surface for a cover-side sealing lip 35 offers (possibly with the interposition of a section of the container wall).

As a result of the skew of the pole faces 23 these are spatially separated from the effective portion of the lid-side sealing lip 35 ,

The in the leg gap 17 embedded coil winding 18 is according to the above-described arrangement of the iron core 16 produced in a favorable manner, by preferably with mechanical assistance, the winding radially on the iron core 16 can be wound up.

The lid 11 is in the illustrated embodiment with a preferably made of aluminum, for overfilling the iron core 16 in the lid closure position designed, circumferential collar 36 Mistake. This extends substantially - with respect to a cover closure position - at an angle of 45 ° to a horizontal, further to the vertical axis x and thus parallel to the alignment of the pole faces 23 ,

Wall inside of the collar 36 they are the inference element 24 training individual elements 25 adapted to the inclination of the pole faces 23 by means of screws 37 fastened, with the screw connection via elastic spacers 38 is blocked. The axial length of the screw shaft surrounding and backward against the associated individual element 25 supporting spacer sleeve 38 is chosen so that a with respect to the direction of extension of the screw 37 sets axial play. For this purpose, the spacer sleeve 38 lengthwise with an excess over the spacer sleeve 38 receiving and at the same time from the screw 37 interspersed bore 39 provided, more preferably with an oversize of about 1 to 3 mm.

In addition, also is the bore 39 opposite the spacer sleeve 38 enlarged in diameter, so that a total of a three-dimensional game of the associated individual element 25 given is.

The mobility of the individual elements 25 is limited by not shown mechanical stops, so that the individual elements 25 acting tensile forces of the electromagnet 19 without losses on the lid 11 can be transferred to position this and build up the holding forces.

The axial length of the spacers 38 and thus the predetermined in the axial direction game of the individual elements 25 is further chosen so that with flush support of the individual elements 25 on the iron core 16 or on its pole faces 23 the seal or the sealing lip 35 completely spent in its sealing end position, whereby a reliable seal is achieved.

As also described with respect to the first embodiment, the individual elements are also in the second embodiment 25 dirt-proof and suitable for assembly, molded or embedded in an elastic material 31 without impairing mobility.

As an alternative to the illustrated and described screw connection, for example, a molded plastic connection is also possible.

For improved definition of the support contact are the return surfaces, ie with the pole faces 23 interacting surfaces of the individual elements 25 by a circumferential groove in the lid edge direction, wide and considered in height extension flat groove 40 to the leg geometry of the iron core 16 customized. Magnetic reluctance forces arise at the edges, which provide full coverage of pole faces 23 and return surfaces of the individual elements 25 aim for and so the positioning of the lid 11 support. Combined with this, other design measures, such as stop edges or guide surfaces to support the centering arrangement of the lid 11 on the container 7 be provided.

In the second embodiment, preferably twelve individual elements 25 for the formation of the return element 24 provided, which individual elements 25 are distributed uniformly over the circumference. Experiments with such an arrangement showed that in an ideal investment of two opposing individual elements 25 , a current of 1 A and 200 turns a holding force of 185 N is achieved, which adds over the preferred total of six single element pairs ideal to a total force of about 1,100 N. The holding forces are correspondingly sufficient to, for example, in the operation of the agitator 8th a rotating liquid column in the container 7 withstand.

By shifting the active surfaces of electromagnet 19 and inference element 24 in a relation to the opening plane E in the cross section sloping plane results in a geometric translation between the magnetic air gap and the remaining gap at the container edge 15 which translation is associated with the cosine of the angle of lowering from the horizontal. Thus, the gap width is in the range of the electromagnet 19 always lower than in the area of the container edge 15 , whereby the force development in this area according to the power coupling via the cover-side collar 36 is reinforced.

The inclination of the pole faces 23 is not necessarily limited to the illustrated and described angle of 45 °. Other acute angles to the horizontal or to the opening plane E are possible in this regard, as well as a combination of several angles for the inclination of the two pole faces 23 , so that, for example, a pole face at an angle of 45 ° and the other pole face is inclined at an angle of 60 °. Also, a plane offset of the pole faces 23 in this respect possible, this at the same or different angles of attack. The return surfaces of the individual elements 25 or through the preferred groove 40 Free-standing bearing surfaces are considered in cross-section adapted to the orientation and inclination of the pole faces 23 , so that in the lid closure position a full-surface contact with the pole faces 23 is reached.

In particular, in the illustrated case, that the container 7 as a mixing vessel for a food processor 1 is used, there is a need in the container 7 provided agitator 8th only with proper closure of the container 7 with the lid 11 to activate. For this purpose, a system-integrated detection of the lid is preferred 11 provided, including the inductance of the electromagnet 19 is used. This is how the coil winding points 18 with lid not attached 11 and accordingly without a return element 24 an inductance of about 60 mH. This value increases with a loose but not necessarily correctly positioned lid 11 For example, at around 100 mH. Only when the lid 11 fully positioned and attracted to preferred key actuation, the final inductance value of the closed loop of about 130 mH is reached. The differences of these states are sufficiently large that a clear detection is possible even taking into account tolerances and external influences. Any contamination or damage in the magnetic air gap, which leads to a deformation and thus to a residual air gap, will lower the inductance value and can be assessed as the extent of the disturbance, which disturbance, for example, also on the display 5 can be displayed.

In addition to monitoring the lid position, the electromagnetic shutter is also protected against the sudden failure of the power supply, especially via the power line. For this purpose, for example, one in the container handle 20 integrated accumulator with charging circuit and condition monitoring offered. According to this embodiment, in the event of a sudden failure of the mains-side power supply, the lid is 11 initially held further electromagnetically, so that this even if possibly trailing agitator 8th can not be removed immediately.

The magnetic closure device is a purely electrically powered mechanism that does not require any moving parts and requires neither a supply of media nor a geometry of mechanically interlocking locking elements. In addition, no preparatory or supporting movements and force exerted by the user are necessary, such as. A directed placement and / or pressing and / or a rotary closure movement of the lid 11 , With low energy consumption large closure forces can be achieved, their application with correct positioning of the lid 11 reliable and can be repeated as often as required without signs of wear. The monitoring of the locking system for correct function can be integrated into the structure itself and does not have to be created separately.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optional sibling version independent inventive development of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1

food processor

2

Control panel

3

regulator

4

regulator

5

display

6

Rührtopfaufnahme

7

container

8th

agitator

9

Agitator

10

Power cord

11

cover

12

fill opening

13

border area

14

container opening

15

container edge

16

iron core

17

Thigh gap

18

coil winding

19

electromagnet

20

container handle

21

switch

22

U-leg

23

pole

24

Return element

25

Single element

26

Form-fitting receptacle

27

T-leg

28

T-leg

29

T-Bar

30

step

31

elastic material

32

sealing bead

33

groove

34

Beaufschlagungssteg

35

sealing lip

36

collar

37

screw

38

Stand Off

39

drilling

40

groove

a

closing direction

x

vertical axis

e

opening plane

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1164772 A1 [0002]

Claims (10)

Container ( 7 ), such as a stirred pot of a food processor ( 1 ), with a lid ( 11 ), the lid ( 11 ) on the container ( 7 ) is fixed so that it can not be opened in the fixed state with human power, wherein further the container ( 7 ) and / or the lid ( 11 ) has an electrical supply and the lock is formed electromagnetically, wherein a return element ( 24 ) of individual elements ( 25 ), characterized in that in the closing direction (a) movable individual elements ( 25 ) are provided. Container according to claim 1 or in particular according thereto, characterized in that the mobility of a single element ( 25 ) is achieved by a resilient suspension and / or preferred that the resilient suspension by embedding of the individual elements ( 25 ) in an elastic material ( 31 ) is reached. Container according to one or more of the preceding claims or in particular according thereto, characterized in that the closure state by a measurement of the inductance of the electromagnet ( 19 ) is verifiable. Container according to one or more of the preceding claims or in particular according thereto, characterized in that a rechargeable battery is provided at least in addition to the electric supply. Container according to one or more of the preceding claims or in particular according thereto, characterized in that in the container ( 7 ) an agitator ( 8th ) and that the agitator ( 8th ) can only be operated when the magnetic closure is activated and possibly checked. Container according to one or more of the preceding claims or in particular according thereto, characterized in that the coil winding ( 18 ) in the lid ( 11 ) facing container edge ( 15 ) of the container ( 7 ) is arranged and / or preferred that the coil winding ( 18 ) parallel to an opening plane (E) of the container ( 7 ). Container according to one or more of the preceding claims or in particular according thereto, characterized in that the electromagnet ( 19 ) of a U-shaped iron core ( 16 ) with the lid ( 11 ) open leg gap ( 17 ), in which the coil winding ( 18 ) is formed, formed and / or preferred that the free pole faces ( 23 ) of the iron core ( 16 ) extend in a horizontal plane and / or preferred that the free pole faces ( 23 ) extend at an acute angle to a vertical. Container according to one or more of the preceding claims or in particular according thereto, characterized in that a single segment ( 25 ) is removable for cleaning or replacement and / or preferred that a single segment ( 25 ) in a radially directed form fit receptacle ( 26 ) and / or that a single element ( 25 ) is screw-mounted and / or preferred that the screw fastening with the interposition of an elastic spacer sleeve ( 38 ) is trained. Container according to one or more of the preceding claims or in particular according thereto, characterized in that the lid ( 11 ) a sealing lip ( 35 ) and that the magnetic closure with respect to a compression of the sealing lip ( 35 ) is oversized in the closed state and / or preferred that the magnetic closure is dimensioned so that it overcomes an initial gap between closing and closing elements of up to 2 mm. Container according to one or more of the preceding claims or in particular according thereto, characterized in that a single element ( 25 ) a middle, in pot or lid edge direction running groove ( 40 ), for adaptation to the end faces of the U-shaped iron core ( 16 ).

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