DE1083949B - Electric oven equipped for grilling - Google Patents

Description

An electric oven set up for grilling is known which has a to generate the upper heat serving radiator, the inner and outer, separated switchable heating elements. In this known oven, the are arranged like a frame outer heating elements are dimensioned for the full heating power required for baking. as well the internal heating elements ■ used for grilling are turned over for full grilling performance. Further it is necessary in these known ovens to achieve the most uniform heat distribution possible, to provide an oven ceiling that reflects heat radiation well.,. ' . "

The object of the invention is to achieve a uniform ¹ S heat distribution in the baking process - without the thermal radiation reflecting eme well oven roof required - and eine.möglichst to obtain favorable utilization of the heating resistors. ; This is achieved according to the invention in that, in order to generate the top heat required for baking, all heating elements are connected in series and the full mains voltage via a switch provided for switching these heating elements. an ·, the ^r 'series connection of these heating elements lies, while by this switch at. the switch position "for grilling, the full mains voltage is only applied to the inner heating elements designed for this voltage and the outer heating elements are switched off.

In this way, even during the baking process, a uniform distribution of heat is obtained, since the Baking not only the outer but also the inner heating elements are effective. Furthermore, will also A saving in resistance material is achieved because the outer heating elements are no longer for the full Baking performance are to be interpreted. . .

If the heating circuit of the oven is a temperature regulating switch "is mastered, so it is according to the invention ^: particularly advantageous to couple the switch serving for switching from baking to grilling with the operating element of the temperature regulating switch, so that the operating movement of this element not only sets the desired temperature during baking The operating mode of the oven (baking or grilling) can also be determined. The temperature control switch is expediently provided with a temperature setting scale which first rises and after reaching the position at which it is switched to grilling , falls again. - - -

In the figure of the drawing, the circuit diagram of an embodiment of the electric oven according to the invention is shown. - "" - For grilling equipped
electric oven

Applicant:
ElcalorA.G.,

Electrothermal Apparatus Factory ^
Aarau (Switzerland)

Representative: Dr. W. Germershausen, patent attorney,
Frankfurt / M., Neae Mainzer Str. 49-51

Claimed priority:
Switzerland from January 29, 1957

Jakob Suter, Buchs, Aargau (Switzerland),
has been named as the inventor

A heating element 1 arranged above the baking chamber consists of five heating elements 2 to 6, which are all connected in series with each other and together serve to generate the top heat. Three of these Heating elements, namely the inner heating elements 2 to 4, serve as grill heating elements 7. - "*

Single-pole switch '8, which is operated via lines 9, 10 is connected to the mains terminals 11, 12, - has three switch positions. In the rest position shown, none of the elements 2 to 6 are in the Heating circuit. In the next position there is the whole radiator 1, namely all elements 2 to 6, in the heating circuit, while in the third position only the grill element 7, namely the inner elements 2 to 4 are switched on in the heating circuit.

The oven also has, in the usual way, a heating element which is used to generate the lower heat 13, which is represented in the diagram by a single heating element, but of course from several can consist of heating elements connected in parallel or in series. The radiator 13 jst via lines 14., 15 connected to lines 9, 10.

The heating circuit is controlled by a temperature control switch 16, its control button with 17 and its contacts located in the heating circuit with 18 and 19 are designated. The control button 17 is provided with a temperature scale 20. The temperature you want in the oven is set by turning the knob 17 with respect to a fixed mark 21.

009 547/339

If the button 17 is rotated counterclockwise from its rest position shown, it takes the set temperature up to 300 ° C and then again down to 160 ° C instead of 160 ° C, another, in particular a lower, final value can be selected. When the set Temperature, the contact 18 is moved in the direction of arrow 22 and reversed when decreased. The contact 19 is connected to a temperature sensor 23 which is arranged in or on the oven. When the temperature in the oven increases, the contact 19 is moved in the direction of arrow 24.

The switch 8 is mechanically coupled to the control button 17, in such a way that it is in the rest position shown, as long as a scale in the range from 0 to z. B. 140 ⁰ C located temperature is set.

If you turn the knob 17 counterclockwise, the switch 8 reaches the second position at 140 ° C, in which the whole radiator 1 is switched on ao. When turning the knob beyond 300 ° C the switch 8 comes into the third position, in which only the grill element 7 located in the middle is switched on, while at the same time the set temperature decreases again. The clutch of the switch 8 with the control button 17 can, for. B. on simple Way via a cam located on the shaft of the button.

When the oven is cold and the zero point of the scale 20 is opposite the mark 21, then touch contacts 18 and 19 do not move and switch 8 is open.

If you now z. B. ' a temperature of 110 ° C, the contact 18 moves in the direction of the Arrow 22, so that the contacts 18 and 19 touch. Now electricity flows in the heating circuit, but only Via the lower heating element 13. The oven heats up and the temperature sensor 23 moves the contact 19 in the direction of arrow 24, so that when the set temperature of 110 ° C is reached, the contacts 18 and 19 separate from each other. The lower heater 13 now remains de-energized for a while until the Contact 19 moves in the opposite direction as a result of a small drop in the oven temperature of the arrow 24 has moved so far that it touches the contact 18 again. The regulating switch 16 thus stops the temperature of 110 ° C practically constant, with only the lower heater 13 is switched on.

Between 140 and 300 ° C, the upper heating element 1 and the lower heating element 13 are effective, while after if only the grill element exceeds the 300 ° C setting 7 and the lower heater 13 are effective. The regulating switch always acts on the described, known manner for keeping the set temperature constant. There in the oven Of course, the temperature is not the same everywhere, is below the oven temperature mentioned above to understand the effective temperature at the location of the temperature sensor, which depends on the to be grilled meat or the like. The prevailing temperature will of course differ slightly; that can may be taken into account when setting the scale 20.

If the entire radiator 1 is switched on, then take its lying at the full mains voltage Series-connected elements 2 to 6, for example, have a power of 900W, while when switched on of the grill heating element 7 whose series-connected elements 2 to 4 are connected to the full mains voltage Performance of z. B. 1600 W (or more).

In the former case, there is even, but not very intensive, thermal radiation, and indeed also from the outer elements 5 and 6, which incidentally are also frame-shaped along the entire circumference of the radiator. This heat radiation is suitable for baking.

In the second case, on the other hand, there is only one part of the inner part of the radiator, namely the middle part Elements 2 to 4, outgoing, much more intense heat radiation, as required for grilling is.

The switch 8, which is used to switch from baking to grilling, could also be provided that he is in the switch position for grilling the terminals 25 and 26 of the elements 5 and 6 together short-circuits, i.e. elements 5 and 6 are bridged, while the series connection of elements 2 to 6 is permanently connected to lines 9 and 10, respectively. In this case, of course, you can't Have a setting range in which only bottom heat is used.

If you attach a switch in the lines 14 or 15, which may also be connected to the Control button 17 of the temperature control switch can be coupled, so it is only possible with Top heat or only work with grill heating.

Claims (3)

Patent claims: 1. An electric oven set up for grilling with a to generate the upper heat serving radiator, the inner and outer, separately switchable heating elements, dadurdi marked, that to generate the top heat required for baking via a circuit these heating elements (2 to 6) provided switch (8) all heating elements (2 to 6) in series are switched and the full mains voltage is applied to the series connection of these heating elements (2 to 6), while this switch (8) in the switch position for grilling the full heating voltage only on the inner heating elements (2 to 4) designed for this voltage and the outer ones Heating elements (5, 6) are switched off. 2. Oven according to claim 1, wherein the heating circuit of a temperature regulating switch is mastered, characterized in that the to switch from baking to grilling serving switch (8) with the control element (17) of the temperature control switch (16) is mechanically coupled, so that by the operating movement of this organ not only the desired Baking temperature set, but also the operating mode of the oven (Bake or grilling) can be determined. 3. Oven according to claims 1 and 2, characterized in that the temperature control switch (16) is provided with a temperature setting scale (20) which initially rises and after reaching the position (300 ° C) at which it is switched to grilling, falls again. Considered publications:
German Patent No. 635 512;
German patent application V 2972 VIIId212 (published on November 6, 1952). 1 sheet of drawings © 1 009 547/339 6.