FR2701094A1 - Electric microwave oven control with built-in grill. - Google Patents

Abstract

The control comprises a "timer" part (15) with a first switch (9) and a "chopping" part with another switch (10), which has a contact (12) for supplying the magnetron of the furnace with a rate. selectable manually. The switch (10) also has at least one contact (13, 19) for supplying the heating element (s) of the grill. Manual selection means, acting on mechanical (20, 24, 26) and electrical (11) members of the "chopping" part (16), make it possible to selectively control the grill resistance (s) through the switch ( 10). The "grill" function, timed or permanent, can thus be operated practically without additional components.

Description

"Electric microwave oven control with built-in grill" La

  The present invention relates to a control of

  electric microwave oven with built-in grill.

  Microwave ovens are known which have an additional "grill" function; they are therefore combined ovens, comprising on the one hand a magnetron for cooking by microwaves, and on the other hand at least one

electric heating resistance.

  The control of a microwave oven is carried out in a conventional manner using an electro-mechanical timer also called "two-axis timer", comprising two rotary knobs of parallel axes, one of which regulates the power , and the other regulates the time of use The power is adjusted by positioning the first rotary button on one or the other of several angular positions, corresponding to a different chopping of the electrical supply of the magnetron ( rate setting

  work of the switch feeding the magnetron).

  In the case of the addition of the "grill" function, additional external and internal components are currently provided, such as switches, specially assigned to the control of this function.

  which increases the complexity and the cost of the whole.

  The present invention aims to avoid these drawbacks, by providing a significant simplification and economy by eliminating separate commands and by using common members, components already existing for controlling the basic "microwave" function. being applied here when ordering

the "grill" function.

  To this end, the invention essentially relates to a control of an electric microwave oven with incorporated grill, comprising a "timer" part with a first switch and a "chopping" part, comprising another switch in series with the previous one. , which has a contact for supplying the magnetron to the oven with a work rate selectable from a manual power selection member, this oven control being remarkable in that the switch of the "chopping" part has still at least one contact for supplying the heating element (s) of the grill, mounted in parallel with the magnetron, and in that manual selection means, acting on mechanical and / or electrical members of the "chopping" part , are provided to selectively control the supply of the grill element (s) through the

this "hash" part.

  Thus, the "chopping" part is used to selectively control the supply of the "grill" function, and on the basis of this principle, it is possible to envisage either a simple "microwave" or "grill" selection, one functions excluding the other, ie a more complete selection system including the possibility of simultaneous intervention of the "microwave" and "grill" functions, allowing combined cooking In addition, the design of the control according to the invention allows you to benefit from the time delay, provided by the "timer" part, when using the oven in its "grill" function, so as to precisely control the cooking time In summary, the microwave oven thus has a "timed grill" function. In a manner known per se, the "chopping" part of a microwave oven control comprises an internal member with an adjustable position from the manual power selection member, said internal member cooperating with a driven wheel. continuously and axially movable in rotation to determine, by means of a chopping lever, the alternating closing and opening times of an electrical contact with flexible blade belonging to the switch of this "chopping" part , with a view to feeding the magnetron according to the desired working rate Usually, a rotary power selection button is mechanically linked to the aforementioned internal member, to adjust the position of the latter. In this context, the invention provides, according to a particular embodiment, that said internal member, with adjustable angular position, is provided with a spout intended to cooperate with the chopping lever, and in that this internal member has a additional predetermined angular position, in which its beak acts on the chopping lever to move at least one flexible blade of the switch of the "chopping" part, for the supply of the grill element (s) In this case, the rotary power selection button preferably has itself an additional angular position for the selection of the "grill" function, corresponding to the position of the internal member with adjustable angular position for which the latter acts, by its

spout on the chopping lever.

  This embodiment therefore makes it possible to select the "grill" function from an existing manual control member, and thus the external controls remain extremely simple. However, this particular solution necessarily puts the magnetron out of service, by interrupting the chopping, when the "grill" function is selected. In the context of the present invention, there is also proposed another solution known as an "incorporated selector", pertaining to the same concept but making possible a simultaneous "microwave" and "grill" operation, by means of an additional selection member which allows

  to order these functions separately or to couple them for combined cooking, while retaining for the "microwave" function (used alone or simultaneously on the grill) the power adjustment power by chopping.

  This solution always starts from a "chopping" part which comprises, in a known manner, an internal member with an adjustable position from the manual power selection member, said internal member cooperating with a wheel driven in continuous rotation and axially movable. to determine, via a chopping lever, the alternating closing and opening times of an electrical contact with flexible blade belonging to the switch of this "chopping" part, with a view to supplying the magnetron according to the desired working rate In this context, the invention provides that the switch of the "chopping" part has a second flexible blade, in connection with the contact for supplying the heating element (s) of the grill, and that a movable internal member, linked to a manual selector with three positions, cooperates with the chopping lever and with the second flexible blade, so that: in a first position of the integral member a movable ree, corresponding to a first position of the manual selector, the second flexible blade feeds the grill element (s), at the same time as the first flexible blade is able to supply the magnetron; in a second position of the movable internal member, corresponding to a second position of the manual selector, the second flexible blade does not supply the grill element (s), while the first flexible blade is suitable for supplying the magnetron; in a third position of the movable internal member, corresponding to a third position of the manual selector, the second flexible blade supplies the grill element (s), while the first blade

  flexible is prevented from feeding the magnetron.

  The movable internal member is advantageously shaped as a lever mounted to pivot, about an axis parallel to the pivot axis of the chopping lever, and capable of occupying three predetermined angular positions,

  this lever having, on either side of its pivot axis, two active ends cooperating respectively with the chopping lever and with the second flexible blade. As for the manual selector, this can be presented as a slider with three positions.

  In any case, the invention will be better understood at

  using the following description, with reference to the drawing

  attached schematic showing, by way of non-limiting examples, some embodiments of this control of electric microwave oven with incorporated grill: Figure 1 is an external front view of a microwave oven equipped with a control in accordance with the present invention with "timed grill" function; Figure 2 is a view similar to Figure 1, showing a microwave oven provided with a control with "built-in selector" function; Figures 3 and 4 are block diagrams of the oven and its control, corresponding respectively to the embodiments of Figures 1 and 2; Figure 5 is a detailed interior view of a control with "timed grill" function, in the "microwave" position; Figure 6 is a partial view of the control of Figure 5, in the "grill" position; Figure 7 is a view similar to Figure 6, illustrating an intermediate position; Figure 8 is a detailed interior view of a control with "built-in selector" function, in the "microwave + grill" position; Figure 9 is a partial view of the control of Figure 8, in the "microwave" position; Figure 10 is a view similar to Figure 9, showing the "grill" position; Figure it is a partial interior view of a first variant of the control with "timed grill" function, in the "microwave" position; Figure 12 is a view of the Figure II control in the "grill" position; Figure 13 is a view, similar to the previous ones, of another variant of the control with "timed grill" function, in the "microwave" position; Figure 14 is a view of the control of Figure 13

in the "grill" position.

  Figures 1 and 2 show the front of a microwave oven, with a door 1 and a side control panel 2, provided with a rotary knob 3 for power selection, with several angular positions identified, 15 d ' a rotary button 4 for timer control, and a start button 5 In a known manner, the

  power selection by button 3 is done by chopping, and the timer control button 4 generally has a double scale (expanded scale for short cooking times).

  In this case, it is a micro-

  waves with built-in grill, the electrical diagram of which can be that of Figure 3, where mark 6 designates a magnetron for microwave cooking, and mark 7 designates one or more electric heating elements of the grill Magnetron 6 and the electric resistance (s) 7, as well as an electric micro-motor 8 for driving the timer, are mounted in parallel in the same circuit, supplied as a whole by a switch 9 belonging to the "timer" part The magnetron 6 and the heating element (s) 7 of the grill are selectively supplied by at least one switch 10

belonging to the "hash" part.

  According to the block diagram of FIG. 3, the chopping switch 10 has a flexible blade 11, movable between a first contact 12 connected to the magnetron 6, and a second contact 13 connected to the heating element (s) 7 The blade it has a fixed point of attachment 14, electrically connected to the switch 9 This blade 11 is controlled from the rotary button 3, which for this purpose comprises, in addition to the angular positions corresponding to the various power levels, an additional angular position GR for controlling the "grill" function (see figure 1) The switch 9 is thus designed as a

inverter.

  A corresponding practical embodiment of the control is illustrated by FIG. 5, the upper half of which shows the "timer" part known per se, which is designated by the general reference 15 and will not be described here in more detail In the lower half of FIG. 5 shows the "chopping" part 16 adapted for

  carry out the additional function "timed grill".

  The assembly is housed in a housing 17, itself placed at

  inside the oven behind the control panel 2.

  FIG. 5 shows a particular embodiment of the chopping switch 10, with its flexible blade 11, one end of which is anchored at a fixed point 14, and the free end of which is here applied against the first contact 12 connected to the magnetron L switch 10 here comprises an auxiliary flexible blade 18, one end of which is fixed at a point corresponding to the second contact 13, and the other end of which, free but capable of coming to bear on a fixed stop 35, forms an auxiliary contact 19 which is located opposite the first contact 12, the free end of the blade 11 being placed between the contacts 12 and 19 and being able to move between these two contacts. The device also comprises, from the mechanical point of view, a member with adjustable angular position 20, mounted rotating around a fixed axis 21 and provided with a central pinion 22, which engages with a pivoting toothed sector (not shown) , itself actuated by means of a cam from the rotary selection button 3 The member 20 cooperates by dogs with a coaxial toothed wheel 23, driven in rotation and able to also describe an axial movement with the against the action of a spring The toothed wheel 23 forms a cam which cooperates with a chopping lever 24, pivotally mounted around an axis 25 close to point 14, the free end of the lever 24

  being located opposite the blade 11.

  The member 20 further comprises a spout 26 giving it a certain cam profile, the spout 26 being provided to cooperate with the lever 24 in a manner which will

described below.

  In the position illustrated in FIG. 5, the spout 26 does not intervene and it is the toothed wheel 23 which, according to the angular position of the rotary member 20, acts at each turn by its periphery on the lever 24, to alternatively hold the blade 11 on the contact 12 or move it away slightly, and thus feed minced the magnetron, in a conventional manner, the grill being kept out of service The oven thus works like a conventional microwave oven, at a power

adjusted by rotary knob 3.

  By bringing the rotary selector 3 to the position GR, the user rotates the member 20 so that the spout 26 of its cam profile comes to push more strongly on a boss 27 of the chopping lever 24, which s then permanently applies to the blade 11 The free end of this blade 11 thus separates from the contact 12, and bears against the auxiliary contact 19 carried by the auxiliary blade 18 An electrical connection is established between point 14 and the contact 13, so that the element (s) of the grill are supplied, see Figure 6 Simultaneously, the magnetron is put out of service, the "chopping" function being neutralized, taking into account the position imposed on the lever 24 The duration of supply of the or resistors is controlled by the "timer" part 15, and the oven is

  thus used in "timed grill".

  For a more complete explanation, FIG. 7 also shows an intermediate position of the blade 11 and of the lever 24, position in which the blade 11 is separated from the contact 12 but remains at a distance from the contact 19 (temporary position of non-supply of the magnetron , in "microwave" operating mode with chopping) It will be noted that, if necessary, a stop can ensure the retention of the free end of the auxiliary blade 18, so that in such an intermediate position, the auxiliary contact 19 be maintained with certainty at

  distance from the free end of the blade 12.

  Figures 2,4,8 and 9, which will now be referred to, relate to a control with "incorporated selector", in which, as illustrated in particular the block diagram of Figure 4, the switch 10 of the part "chopping" is double, that is to say that it comprises two blades ll A and 11 B allowing an independent supply of the magnetron 6 and of the resistance or resistances 7 of the grill. This double switch 10 is controlled manually from a selector, which in the particular external presentation illustrated by FIG. 2 is a cursor 29

  movable between three positions: a "micro-" position

  "MO" waves, a "grill" position GR and a combined "microwave and grill" position marked MO + GR, coupling the two basic functions "microwave" and "grill" for cooking

combined.

  FIG. 8 shows a corresponding practical embodiment, with a housing 17 containing the "timer" part 15 and the "chopping" part 16, the generally known constituent elements of which will not be

  described, the bodies corresponding to those previously named being designated by the same references.

  Considering more particularly the switch of the "chopping" part, the first flexible blade l A has a fixed attachment point 14, electrically connected to the switch 9 of the "timer" part (see also Figure 4) The second blade flexible 11 B has a fixed attachment point 13, and a free end situated opposite that of the first blade li A Points 12 and 13 retain their previous meanings, that is to say that they are fixed contacts of the chopping switch 10, respectively connected to the magnetron 6 and to the

or heating resistors 7.

  The chopping lever 24, controlled by the toothed wheel 23, acts here only on the first blade li A,

  while the member 20 has no spout.

  Another lever 30 is provided, pivotally mounted about an axis 31 parallel to the pivot axis 25 of the chopping lever 24 The lever 30 is controlled from the slider 29 This lever 30 has a first end 32 and a second end 33, located on either side

of its pivot axis 31.

  In a first position (Figure 8), the lever is oriented so that it does not act on any of the two blades l A and ll B The free ends of the two blades l A and 11 B thus remain applied one against the other the other, and these blades establish an electrical connection between points 13 and 14 The "grill" function is thus supplied In addition, the first blade li A comes into contact with the contact 12, and it deviates from it periodically at the rate imposed by the control of the chopping lever 24 by the wheel 20 The "microwave" function is thus supplied, simultaneously with the "grill" function but with chopping effect. When the lever 30 is raised, as shown in FIG. 9, its lower end 33 lowers the second blade ll B, which thus deviates from the first blade li A The electrical connection between the points 13 and 14 is thus found interrupted and the "grill" function is no longer supplied On the other hand, the first blade 11 A remains in contact with the contact 12, and deviates from it only under the action of the chopping lever 24 controlled by the wheel 20 Only the "microwave" function is thus supplied. Finally, when the lever 30 is tilted, as shown in FIG. 10, its end 33 again releases the second blade 11 B, but its other end 32 comes to press on the chopping lever 24, which itself then causes the lowering of the first blade l A, thus removing it from contact 12 The "microwave" function is then put out of service On the other hand, the free ends of the two blades l A and llb are held in abutment one against the other, which establishes between points 13 and 14 an electrical connection supplying the "grill" function. It is therefore understood that the three operating positions, which have just been successively described with reference to FIGS. 8, 9 and 10, correspond respectively to the positions MO + GR, MO and GR of the cursor 29 The connection between the cursor 29 and the lever internal 30 is achievable by any mechanical means, capable of converting the translational movement of the

  cursor 29 in a rotation movement of lever 30.

  Figures 11 and 12 partially show a variant, functionally equivalent to the control with "timed grill" function according to Figures 5 to 7, but comprising in the "chopping" part 16 a switch 10 which has a single flexible blade 11, the blade auxiliary being removed The single blade has an end anchored at a fixed point 14, electrically connected to the switch of the "timer" part The free end of the blade It is movable between a first fixed contact 12, connected to the magnetron, and a second fixed contact 13, connected to the grill resistance (s) This variant therefore gives concrete form to the principle diagram of FIG. 3, with reversing switch FIG. 11 illustrates the operating position "microwaves", for which the lever chopping 24 is not moved by the spout 26 of the member, so that the blade remains raised and cooperates with the contact 12 Figure 12 illustrates the operating position "g ril ", for which the chopping lever 24, moved by the spout 26, lowers the blade 11, thus removing it from the contact 12 and applying it against the other contact 13. Figures 13 and 14 partially represent another variant , functionally equivalent to the command with "timed grill" function according to the figures in 7, but comprising in the "chopping" part 16 a slightly modified switch 10 The switch 10 here again comprises a main blade 11 and a blade

  auxiliary 18, but the mechanical supports are different.

  In particular, there is provided under the auxiliary blade 18 an intermediate support point 34, which may be constituted by an internal boss formed on the housing 17 The auxiliary blade 18 is bent on the support point

  intermediate 34, when passing from the "micro-" position

  waves "(figure 13) to the" grill "position (figure 14).

  It goes without saying that the invention is not limited to the sole embodiments of this control of an electric microwave oven with incorporated grill which have been described above, by way of examples; on the contrary, it embraces all of the variants of embodiment and of application respecting the same principle. It is thus, in particular, that one could still envisage other variants, as regards the configuration of the switch of the "chopping" part, whether it is a command with a "timed grill" function or a command with a "built-in selector" function Furthermore, in the case of an order with a "built-in selector" function, the manual selector is achievable not only as a cursor with linear movement, but also in the form of a rotary selector, or else in the form of a selector with keys, the external arrangements illustrated by FIGS. 1 and 2 being obviously not limiting and constituting only examples of presentations.

Claims (9)

  1 Electric microwave oven control with incorporated grill, comprising a "timer" part (15) with a first switch (9) and a "chopping" part (16), comprising another switch (10) in series with the previous, which has a contact (12) for supplying the magnetron (6) of the furnace with a work rate selectable from a manual power selection member (3), characterized in that the switch (10 ) of the "chopping" part (16) also has at least one contact (13,19) for supplying the heating element (s) (7) of the grill, mounted in parallel with the magnetron (6), and in this that manual selection means (3; 29), acting on mechanical (20,24,26,30) and / or electrical (11;  11 A, 11 B) of the "chopping" part (16), are provided for selectively controlling the supply of the grill element (s) (7) through the switch (10) of this part "hash" (16).   2 electric microwave oven control with incorporated grill according to claim 1, characterized in that it is designed to selectively control the supply of the resistance or resistances (7) of the grill, through the switch (10 ) of the "hashing" part (16), while benefiting from the time delay provided by the "timer" part (15).   3 electric microwave oven control with incorporated grill according to claim 1 or 2, wherein the "chopping" part (16) comprises an internal member (20) adjustable position from the manual power selection member (3), said internal member (20) cooperating with a wheel (23) continuously rotated and axially movable to determine, by means of a chopping lever (24), the times of closing and alternating opening of an electrical contact with flexible blade (11) belonging to the switch (10) of this "chopping" part (16), with a view to supplying the magnetron (6) according to the desired working rate, characterized in that said internal member (20), with adjustable angular position, is provided with a spout (26) intended to cooperate with the chopping lever (24), and in that this internal member (20) has an angular position additional predetermined, in which its beak (26) acts on the chopping lever (24) for moving at least one flexible blade (11,18) of the switch (10) of the "chopping" part (16), for the supply of   the grill element (s) (7).   4 Electric microwave oven control with incorporated grill according to claim 3, wherein the manual power selection member is a rotary knob (3) mechanically linked to the internal member (20) above, for adjusting the position angle of the latter, characterized in that the rotary power selection button (3) itself has an additional angular position (GR) for the selection of the "grill" function, corresponding to the position of the internal member ( 20) with adjustable angular position for which the latter acts, by its beak (26), on the chopping lever (24).   Electric microwave oven control with built-in grill according to claim 3 or 4, characterized in that the switch (10) of the "chopping" part is designed as a reversing switch, with a single flexible blade (11), anchored at a fixed point (14) electrically connected to the switch (9) of the "timer" part (15), the free end of the blade (11) being movable between a first fixed contact (12) for   supplying the magnetron (6) and a second fixed contact (13) for supplying the grill element (s) (7).   6 Electric microwave oven control with built-in grill according to claim 3 or 4, characterized in that the switch (10) of the "chopping" part (16) comprises a flexible blade (11) anchored at a fixed point (14) electrically connected to the switch (9) of the "timer" part (15), and an auxiliary flexible blade (18) anchored at a fixed point (13) connected to the resistance (s) (7) of the grill, the free end of the first blade (11) being movable between a fixed contact (12) for supplying the magnetron (6) and an auxiliary contact   (19) provided at the free end of the auxiliary blade (18).   7 Control of an electric microwave oven with incorporated grill according to claim 1 or 2, in which the "chopping" part (16) comprises an internal member (20) with position adjustable from the manual power selection member. (3), said internal member (20) cooperating with a wheel (23) continuously rotated and axially movable to determine, by means of a chopping lever (24), the times of closing and alternating opening of an electric contact with flexible blade (li A) belonging to the switch (10) of this "chopping" part (16), with a view to supplying the magnetron (6) according to the desired working rate, characterized in that the switch (10) of the chopping part (16) has a second flexible blade (11 B), in connection with the contact (13) for supplying the heating element (s) (7) grill, and in that a movable internal member (30), linked to a manual selector with three p ositions (29), cooperates with the chopping lever (24) and with the second flexible blade (11 B), so that: in a first position of the movable internal member (30), corresponding to a first position ( MO + GR) of the manual selector (29), the second flexible blade (11 B) supplies the resistance (s) (7) of the grill, at the same time as the first flexible blade (li A) is capable of supplying the magnetron (6 ); in a second position of the movable internal member (30), corresponding to a second position (MO) of the manual selector (29), the second flexible blade (ll B) does not supply the resistance (s) (7) of the grill , while the first flexible blade (li A) is able to supply the magnetron (6); in a third position of the movable internal member (30), corresponding to a third position (GR) of the manual selector (29), the second flexible blade (11 B) supplies the resistance or resistances (7) of the grill, while the first flexible blade (li A) is prevented from feeding the magnetron (6).   8 control of electric microwave oven with built-in grill according to claim 7, characterized in that said movable internal member (30) is shaped as a lever, mounted to pivot about an axis (31) parallel to the pivot axis (25) of the chopping lever (24), and able to occupy three predetermined angular positions, this lever (30) having, on either side of its pivot axis (31), two active ends (32,33) cooperating respectively with the chopping lever (24) and with the second flexible blade (11 B).   9 Electric microwave oven control with built-in grill according to claim 7 or 8, characterized in that the manual selector with three positions, to which said movable internal member (30) is linked, is a slider (29).   Electric microwave oven with built-in grill, provided with a control according to any one of claims 1 to 9.