DE19816556C2 - Oven muffle with floor spacers for a swiveling bottom heat radiator - Google Patents

Description

The invention relates to a muffle oven.

There are oven muffles for ovens (baking and roasting ovens) knows with a muffelin surrounded by a muffle wall interior (cooking space), which ver with a muffle door lockable loading opening with food to be cooked and for cooking the food from one or more electri heating radiators.

From DE-AS 12 12 649 a cooking oven is known with a cooking furnace muffle with one above the muffle bottom inside the Muffle interior arranged tubular heater, which at Ver supply the interior of the muffle with an electric current irradiated with heat radiation from below and in general as (internal) underheating radiator or short as Un is called heat. The internal bottom heat heater Body is to be cleaned in this well-known oven muffle purposes from an operating position in which the tubular heating body lies parallel to the muffle bottom, within a ver tical elongated hole freely upwards by a small angle can be swiveled into an inclined end position. The Be drive position and the oblique end position of the free Swiveling movements are defined by a corresponding appropriate stop limit.  

Another oven muffle is known from US-A-4,049,948 with one to make cleaning the muffle floor easier swiveling bottom heat radiator, which consists of a U-shaped curved electric heating element is formed. The two The ends of the heating rod are each in one on the muffle rear wall attached pivot bearing, so that the lower heat radiator around an axis of rotation from an operating site parallel to the muffle floor upwards by a certain amount Angle can be rotated into an end position. Furthermore are on a latch at both ends of the bottom heating element provided, each in one on the associated pivot bearing attached detent spring in the manner of a backdrop guide at Rotate the bottom heat radiator and are in the End position of the bottom heat radiator in a bulge engage the respective detent spring. Is in the end position the bottom heat radiator is held by locking and in the operating position by appropriate stops that on appropriate stop surfaces below the pivot bearing attacks. Between the operating position and the final position The (bottom position) is the bottom heating element known oven muffle, however, not kept. Thereby can heat the inadvertent dropping of the bottom heat body from an upper position of the lower heat radiator open the muffle floor and enamel the Damage the muffle bottom.

The invention is therefore based on the object of cooking to indicate furnace muffle with swiveling bottom heat radiator, where the problems mentioned in the prior art ver be avoided.

This object is achieved according to the invention by Oven muffle with the features of claim 1.  

The oven muffle covers

• a) a muffle interior surrounded by a muffle wall is closed and one with a in the muffle wall Oven muffle door with lockable loading opening for Introducing food to be cooked,
• b) at least one electrically heated bottom heat radiator in an operating position (Garstel lung) in the lower area of the muffle interior above the muffle bottom is arranged and out of operation position within a predetermined swivel range is pivotable in the muffle interior

such as

• a) attach at least one to the bottom heat radiator th floor spacer (foot element, support body) for Space the bottom heat radiator from the muffle floor in the operating position.

The floor spacer (s) set in operation position of the bottom heat radiator on the muffle base and thus support the bottom heat radiator in its operation position on the muffle floor. This will make it easy Way a defined distance of the bottom heater from Muffle base adhered to, so that the muffle base is thermal is not too heavily loaded by the bottom heat radiator and the bottom heat radiator in its for heating of the muffle interior from below to the optimal operating position comes to lie. A limit stop for the bottom heat radiator on a swivel as in the prior art can be omitted, so that the swivel mechanism ver can be simplified. In addition, the separate Bo the spacers provide a more even support and beab Position of the lower heat radiator reached from the muffle bottom  and the bottom heat radiator is not caused by post-vibration nevertheless come up on the muffle floor as with the genann state of the art.

By swiveling the bottom heat radiator, the sleeve can on the one hand for cleaning purposes or for cleaning place more voluminous food or food carriers easily be made accessible.

Advantageous refinements and developments of the Gar Oven muffle according to the invention result from the on saying 1 dependent claims.

In a first advantageous development of the oven socket fel are the floor spacer (s) on one with the Lower heat radiator at at least two connection points connected bracket formed or molded, in particular each at one end of the bracket. The bracket is preferably two se formed from a wire. At least one verb the bracket with the bottom heat radiator preferably a receiving loop in which the bottom heat body is insertable (snap-in, clip-in).

The bracket can also be used in special developments Perform functions, especially a handle to Have pivoting of the lower heat radiator and / or egg Protection against accidental contact (hand protection, burn protection) of the Form bottom heat radiator and / or at least one above spacer for spacing the bottom heat radiator pers of overlying objects, especially gar carriers, carry or embrace.  

The handling of the bottom heat radiator can by Training can be improved with one hand. Insbeson can be used in conjunction with heat-insulating materials Burns from touching the still hot radiator be avoided. In addition, the bottom heat radiator not touched during manual pivoting and therefore not dirty unnecessarily.

In the version with a handle, the bracket is on the sides of the handle on at least two Ver connection points connected to the lower heat radiator in order To better balance torques and torsional moments NEN.

In another embodiment, the oven muffle Locking means provided for locking the lower hit heater in several or all swivel positions in within at least a portion of the swivel range by exerting the gravity of the bottom heat radiator counteracting locking forces. This is one Incorrect operation is virtually impossible, since several or all of them Lower heat positions are permitted. An overuse of swivel or swivel joints for swiveling the Lower heat radiator or any damage to the Muffle bottom by an unintentionally swiveling down and on This causes the bottom heat to hit the muffle bottom effectively excluded. The locking means can special friction elements for exerting friction ten on the bottom heat radiator or at least a rest device that the bottom heat radiator in several Swivel positions locked, i.e. by mechanical teeth holding or carrying forces include.  

The bottom heat radiator is preferably about an axis of rotation rotatable, which is defined in particular by a rotary shaft with which the bottom heat radiator is firmly connected and on the end faces of each of the cam flanges are arranged, each in corresponding bearing sleeves, preferably within two flange shells, rotatable ge leads are. It can then in particular as a frictional engagement elements whose spring cup elements are provided in the vicinity the rotating shaft on the bottom heat radiator are and each on the wall of one of the bearing sleeves rub against spring tension.

In a particularly advantageous embodiment of the Garo fenmuffel is every floor spacer with a Federele ment connected (sprung) and / or itself, in particular thanks to hook or J-shaped design, springy (with rever sibler deformation exerting a restoring force) det. This gives the floor spacer or that with the Ground spacer connected spring element when putting on of the bottom heat radiator with the inclusion of a spring chip a little bit so that a by the downward movement of the Lower heat radiator force acting on the muffle bottom is cushioned (intercepted) and damage to the generally consist of an enamelled steel sheet the mold floor is avoided. Furthermore, by the sprung or resilient floor spacer any Vi fractions in the cooking mode and noises generated thereby be dampened.

In a preferred combination of the embodiment with the sprung or resilient floor spacers and the Embodiment with the locking means are the arrays tierungsmittel and the suspension of or in the ground spacers  dimensioned so that the locking forces the locking means that when lowering the sub heat body and placing the floor spacer on the Muffle floor in the floor spacers or on them acting spring elements by the movement forces and the spring tension generated at least in part by gravity maintained. The locking means prevent through the locking forces exerted by them a Ent tension of the suspension up to the equilibrium position in the Force equilibrium with the gravity of the bottom heat heater body. The floor spacers are therefore under one predetermined spring preload on the muffle base on where due to annoying noise and mechanical Ver wear in connection with otherwise possible vibrations of the bottom heat radiator can be reduced during operation.

Preferred materials for floor spacers or brackets or upper spacers, if these are separately on the Un The heat radiators are arranged, are metals or Me Valley alloys that are heated to a temperature of at least 500 ° C are reversibly deformable, d. H. be elastic true, preferably stainless steel.

The bottom heat radiator generally comprises a tube radiator, which at least predominantly essentially par allel is bent to one level (level) and thus as possible space-saving above the muffle floor can.

In a further embodiment, the bottom heat comprises radiator (electrical) connection areas, which by jewei openings in the back of the muffle or one of the muffle side walls are guided, and is on the inside of the muffle  lying side in close proximity to the An closing areas each curved away from the muffle bottom. By this curvature can occur when cleaning the bottom heat radiator on this running down cleaning liquid not to the Connection areas and through the openings to the outside gene.

A cooking oven with a cooking oven muffle according to the invention can also switch means to interrupt the electrical Have power supply for the bottom heat radiator, the Turn off the power when the bottom heat radiator is off the operating position is pivoted.

The invention is based on several in the following Drawing only schematically shown exemplary embodiment le explained in more detail. Show it:

Fig. 1 shows a cooking oven with top and bottom heating element in cross-section,

Fig. 2 is a geschnit tene along the line II-II in FIG. 1, top view of the muffle base of the cooking oven according to Fig. 1,

Fig. 3 is a plan view of a bottom heating element with mounting bracket,

Fig. 4 shows a detail of the bottom heating element with mounting bracket of FIG. 3 in a side view,

FIG. 5a is a front view of a rotary joint,

Fig. 5b is a cross section of the pivot joint taken along the line Vb-Vb in Fig. 5a,

Fig. 5c is a top view of the pivot axis of the Drehge Lenk

FIG. 5d shows a side view of the pivot axis of FIG. 5c,

Figure 6 Rdevice. A cross-section, of the swivel joint along the section line VI-VI in Fig. 5a with mounted Fede,

Fig. 7a is a partially sectioned side view of a rotary joint with a catch spring in the operating position of the bottom heat,

Fig. 7b shows a top view of the detent spring of Fig. 7a in the operating position of the bottom heat,

Fig. 7c shows a partially sectioned side view of a rotary joint with a catch spring in a cleaning Stel averaging the bottom heat,

Fig. 7d is a top view of the detent spring of Fig. 7c in the cleaning position of the bottom heat,

Fig. 8 shows a section of another embodiment of the unheat in cross section in the region of the swivel and

Fig. 9 a connection point between the underheat body and bracket.

Figs. 1 and 2 show a cooking oven with a Garofenmuf fel 1, which is suspended in a housing 50 or attached. The oven muffle 1 has a cooking space, the so-called th muffle interior, 4, which from a muffle cover 2 upwards, from a muffle base 6 downwards, from two the muffle base 6 with the muffle cover 2 connecting muffle side walls 5 and 5 'to the side and is completed at the rear by a muffle rear wall 11 . The muffle wall, but at least the muffle base 6 , preferably consists of an enamelled steel sheet. To the front, the muffeline interior 4 is accessible through a loading opening 51 for introducing food to be cooked. The loading opening 51 can be closed by a door, not shown.

Within the muffle interior 4 , an electric upper heat radiator body 3 and an electric lower heat radiator 7 are arranged directly below the muffle ceiling 2 and directly above the muffle base 6 .

The bottom heating element 7 is formed from a tubular heating element (tubular heating element, heating element) which is formed, in particular, bent, in particular in one plane to a rectangular, as shown in FIG. 2, or also meandering (not shown) heating structure.

Fig. 3 shows the lower heat radiator 7 shown in FIG. 2 in a ner detailed plan view. The bottom heat radiator 7 is rotatably supported by its ends 14 and 14 'in a swivel joint 10 . The swivel joint 10 can in particular be fastened as an articulated connection to the muffle rear wall 11 , the muffle base 6 or also the side walls 5 and 5 '. There is now a strap, preferably connected at the end remote from the hinge 10 side of the heat radiator 7 in addition 12 of a metal wire of a stainless steel, with the lower heat radiator. 7 The bracket 12 has a handle 45 in a central region, which projects above the lower heat radiator 7 . On the handle 45 , the lower heat radiator 7 can be pivoted about the rotary joint 10 . The bracket 12 is preferably made of a stainless steel at the operating temperatures of the Unterhit zeheizkörper 7 not "glowing" and can be provided in particular with a coating of temperature-resistant, heat-insulating material for better protection of the hand from burns.

The bracket 12 now crosses the bottom heater 7 twice on both sides of the handle 45 . Each crossing point forms a connection point 31 to 34 , on which the bracket 12 and the lower heat radiator 7 are connected to one another.

At the ends of the bracket 12 projecting beyond the outer connection points 31 and 32 , a bottom spacer 13 and 13 'projecting downward is formed in each case. Fig. 4 shows one of the two bottom spacer 13. The other floor spacer 13 'is preferably formed accordingly. The floor spacer 13 is hook-shaped or J-shaped and preferably by, in particular, right-angled, bending of the wire of the bracket 12 downwards, it produces. Due to the illustrated, special design of the Bo denabstandshalter 13 (and 13 '), they can in the orthogonal direction (normal direction) to the underheat heater 7 fe, that is, yielding under the action of a compression-dependent restoring force. This suspension of the ground clearance holder 13 and 13 'is supplemented by the spring action of the adjoining, up to the adjacent connection points 31 and 32 extending pieces 41 and 43 of the bracket 12 , each acting as spring arms (spring elements). These resilient or spring-loaded bottom spacers 13 and 13 'cause the bottom heat element 7 to be placed gently on the muffle base 6 when pivoted into the operating position parallel to the muffle base 6 , so that damage to the muffle base 6 due to the impact of the bottom heater element 7 on the muffle base 6 not possible. In the operating position of the bottom heat radiator 7 , the base spacers 13 and 13 'rest on the muffle base 6 .

The between the connecting points 31 and 33 on the one hand and 34 and 32 on the other hand intermediate pieces 42 and 44 of the bracket 12 are the same when placing the bottom heat radiator 7 or when pivoting on the handle 45 act de torsional moments and torques, so that the connec tion points 41 to 44 relieved become. These intermediate pieces 42 and 44 can in particular also be bent upwards and then additionally serve as an upper spacer in order to keep the lower heat radiator 7 away from overlying baking trays or grids. Furthermore, the intermediate pieces 42 and 44 of the bracket 12 together with the handle 45 can also act as a protection against contact for the lower heat radiator 7 .

There can also be further ground spacers, not shown, attached to the bracket 12 or formed by bending U-shaped extensions downward from the bracket 12 .

The connection of the bracket 12 and the lower heat radiator 7 at the connection points 31 to 34 can be effected by means of clamps or the like, as indicated in FIG. 4, or else according to FIG. 9 by receiving loops in the wire bracket.

Fig. 9 shows a by looping the wire Aufnah meschlaufe 46 in the bracket 12 , which, preferably from below, is snapped onto the lower heat radiator 7 . The recording loops of the bracket 12 can point at different connec tion points in the same direction or in different directions.

A possible embodiment of a swivel joint 10 is shown in FIGS. 5a to 5d and 6.

Two ends 14 and 14 'of the bottom heat radiator 7 each open into through-openings 15 and 15 ' of a rotary joint 10 surrounding the flange shell 16 , which is preferably attached to the rear muffle wall 11 . Within the flange 16 , the preferably mutually parallel ends 14 and 14 'of the lower heat radiator 7 are connected to a rotary shaft (pivot axis) 17 , the longitudinal extension of which is at least approximately orthogonal to the preferred direction of the ends 14 and 14 '. The rotary shaft 17 has a cam disc 20 on its respective end faces, which are each rotatably mounted in the flange shell 16 . The clear width of the through openings formed in the manner of an elongated hole 15 and 15 'limits a pivoting range of the lower heat radiator 7 , which extends from an approximately horizontal operating position to an cleaning position directed at an angle of up to 90 ° to the operating position.

In addition, a spring cup element 21 or 21 'is plugged onto the ends 14 and 14 ' in each case within the flange shell 16, which widens conically up to the inner wall of the flange shell 16 beyond the region of the push-through opening 15 or 15 'in such a way that the cup rim 22nd or 22 'abuts this inner wall. As a result, the bottom heat radiator 7 can be locked in any pivoting position.

Another embodiment of the swivel joint 10 is shown schematically in FIGS. 7a to 7d. The flange shell 16 surrounding the swivel joint 10 is on the side facing the rear muffle wall (not shown in FIGS . 7a to 7d) with at least one detent spring 23 and preferably, as here, with a number corresponding to the number of ends 14 and 14 ' Detent springs 23 connected. The locking springs 23 have substantially the cross section of the angular element, wherein the adjacent ones of the rear muffle wall shallow angle leg 24 in the longitudinal direction of a nip 25, preferably in the center, is divided. The clamping gap 25 , which runs, for example, in the vertical longitudinal direction, is penetrated by the horizontal ends 14 and 14 'of the bottom heating element 7, each orthogonal to its longitudinal extent. As a result, the clamping gap 25 gapes against its spring force. Overcoming these spring and frictional forces, the lower heat body 7 can be pivoted into its respective cleaning position. According to Fig. 7d of the nip 25 can be extended to the side facing the cooking chamber side. With a correspondingly graduated diameter of the ends 14 and 14 ', there is thus a defined end position for the lower heat radiator 7 . This end position preferably corresponds to the cleaning position.

Another embodiment is shown in Fig. 8 in a detailed view. In this embodiment, the sub-heating element 7 is provided in an outside of the cooking space 4 , behind the muffle rear wall 11 fastening area 8 with a strain relief 9 , which absorbs part of the maximum holding forces in the operating position of the heating element 7 . As a result, the respective rotary joints 10 are relieved.

In this embodiment, the bottom heat radiator 7 additionally has a curvature region 18 with a curvature facing away from the muffle plate 6 , which curvature is always rectified (the same sign), that is to say convex or concave. This prevents that when cleaning the bottom heat radiator 7 in the cleaning position cleaning liquid speed flows into the joint or connection area of the bottom heat radiator 7 . The cleaning position of the bottom heat is characterized by the reference numerals 2 ', 7 ', 8 'and 18 ' net, the operating position of the bottom heat by the reference characters 2 , 7 , 8 and 18th

The swivel joints 10 shown in all exemplary embodiments are almost completely closed. They are therefore robust and require little maintenance.

Instead of the described embodiments for Arre Tierungsmittel for the bottom heat radiator can naturally Lich other known locking means for locking one rotatable or pivotable in a swivel joint Body are used. In particular, neither can resilient frictional engagement elements in the manner of a clutch mutually rubbing surfaces within the swivel joints or of swivel connections can be used.

In an embodiment, not shown, a latching device for the lower heat radiator 7 can also be provided, so that the lower heat radiator 7 is not continuously locked in each swivel position, but discretely in several latched positions within the swivel range. The locking device can be formed, for example, in the manner of a locking roller with a plurality of recesses or locking lugs (locking pin) provided on the rotary shaft for the bottom heat radiator and with a corresponding locking lug or a recess attached to the muffle wall, with a locking lug snapping into a recess in the recess Bottom heat radiator is locked in the corresponding locking position.

The embodiment with a locking device or general my the bottom heat radiator discreetly in several swivels positions locking means and friction lock ßelements or generally the bottom heat radiator continuously Lockable in every swivel position resources can also be combined with each other, in which the different locking means in different parts of the swivel range take effect.

The top heat radiator 3 shown in FIG. 1 can be constructed in a manner analogous to that of the bottom heat radiator 7 and in the same or similar manner on the muffle rear wall 11 , the muffle top 2 or the two side walls 5 and 5 '.

LIST OF REFERENCE NUMBERS

1

Garofenmuffel

2

muffle ceiling

3

Top heat radiator

4

oven

5

.

5

'' side muffle wall

6

mold base

7

Bottom heating element

8th

fastening area

9

Strain relief

10

swivel

11

Muffle rear wall

12

hanger

13

foot element

14

.

14

'Bar ends

15

.

15

'' Through openings

16

Flanschschale

17

swivel axis

18

curvature region

20

cam

21

.

21

'Spring cup element

22

.

22

'Cup rim

23

detent spring

24

angle leg

25

nip

31

to

34

junction

41

to

44

connecting piece

45

handle

46

recording loop

50

casing

51

loading port

Claims (25)

1. Cooking oven muffle, with

• a) a muffle interior ( 4 ), the side of Muffelsei tenwalls ( 5 , 5 ', 11 ), upwards from a muffle cover ( 2 ), down from a muffle bottom ( 6 ) and backwards from a muffle back wall ( 11 ) and at the front has a closable loading opening ( 51 ) for inserting food to be cooked, and with
• b) at least one electrically heated lower heat radiator ( 2 ) which is arranged in an operating position in the lower area of the muffle interior ( 4 ) above the muffle bottom ( 6 ) and can be pivoted from the operating position within a predetermined swiveling range in the muffle interior ( 4 ) .
• c) at least one floor spacer ( 13 , 13 '), which is connected to the lower heat radiator ( 7 ) and the lower heat radiator ( 7 ) in its operating position from the muffle base ( 6 ) at a distance.

2. Oven muffle according to claim 1, wherein each Bodenab stand holder ( 13 ) with a spring element ( 41 ) verbun the and / or is designed to be resilient. 3. Oven muffle according to claim 2, wherein each Bodenab stand holder ( 13 ) is substantially hook-shaped or J-shaped. 4. Oven muffle according to one of the preceding claims, wherein each floor spacer ( 13 , 13 ') is part of a bracket ( 12 ) connected to the bottom heat radiator ( 7 ) at at least two connection points ( 31 to 34 ). 5. Oven muffle according to claim 4, in which a Bo denabstandshalter ( 13 , 13 ') is formed at one end of the bracket ( 12 ). 6. Oven muffle according to claim 4 or claim 5, wherein the bracket ( 12 ) is formed from a wire. 7. Oven muffle according to claim 6, wherein the bracket ( 12 ) has at least one connection point with the lower heat radiator a receiving loop ( 46 ) with which the bracket ( 12 ) on the lower heat radiator ( 7 ) can be snapped. 8. Oven muffle according to one of claims 4 to 7, wherein the bracket ( 12 ) has a handle ( 45 ) for pivoting the lower heat radiator ( 7 ). 9. Oven muffle according to claim 8, wherein the bracket ( 12 ) on both sides of the handle ( 45 ) at least two connection points ( 31 , 33 and 32 , 34 ) is connected to the lower heat radiator ( 7 ). 10. Oven muffle according to one of claims 4 to 9, in which the bracket ( 12 ) at least partially projects above the lower heat radiator, so that a contact protection of the lower heat radiator ( 7 ) is formed. 11. Oven muffle according to one of the preceding claims with at least one upper spacer, which is connected to the lower heat radiator ( 7 ) and the sub-heat radiator ( 7 ) at a distance from objects above, in particular food carriers, holds. 12. Oven muffle according to claim 11, wherein the at least one upper spacer is formed with a part of the bracket ( 12 ) projecting upwards from the lower heat radiator ( 7 ). 13. Oven muffle according to one of the preceding claims, in which each floor spacer ( 13 ) or the bracket ( 12 ) or each upper spacer is formed with a metal or a metal alloy which is reversibly ver up to a temperature of at least 500 ° C. is malleable, especially a stainless steel. 14. Oven muffle according to one of the preceding claims, where the bottom heat radiator is a tubular heater comprises, which is at least predominantly essentially par allel is bent to one level. 15. Oven muffle according to one of the preceding claims with locking means for locking the lower heat radiator ( 7 ) in several or all swivel positions within at least a partial region of the swivel range by exerting the gravity of the lower heat radiator ( 7 ) counteracting locking forces. 16. Oven muffle according to claim 15, wherein the locking means comprise at least one frictional engagement element ( 21 , 21 ') which exerts on the bottom heat radiator ( 7 ) in each of the pivot position within the partial range of the pivot range or the entire pivot range friction forces which the at least cancel the underheating heater by ( 7 ) acting gravity. 17. Oven muffle according to claim 15 or claim 16, wherein the locking means comprise at least one Rastein direction, which locks the bottom heat radiator ( 7 ) in several pivot positions. 18. Oven muffle according to one of claims 15 to 17, wherein the lower heat radiator ( 7 ) is rotatable about an axis of rotation. 19. Oven muffle according to claim 18, in which the Unterhit zeheizkörper ( 7 ) with a rotary shaft ( 17 ) is firmly connected, on the faces of each cam flanges ( 20 ) are arranged, each in corre sponding bearing sleeves, preferably within two flange shells ( 16 ) are rotatably guided. 20. Oven muffle according to claim 19, in which as the friction circuit elements spring cup elements ( 21 , 21 ') are provided, which are on a near the rotary shaft ( 17 ) be sensitive part of the lower heat radiator ( 7 ) and are each on the wall , in particular the inner wall, each of one of the bearing sleeves ( 16 ) rubbing against the spring tension. 21. Oven muffle according to claim 19, in which on each La gerhülse ( 16 ) each have a detent spring ( 23 ) with a resilient clamping gap ( 25 ) is attached such that one end ( 14 , 14 ') of the lower heat radiator ( 7 ) in it Operating position in each case at an angle to the longitudinal extent of the clamping gap ( 25 ) guided through this clamping gap, in the cleaning position at least approximately positively in the clamping gap ( 25 ) and within the intervening rule swiveling range overcoming the spring inherent in the respective detent springs ( 23 ) movable force is. 22. Oven muffle according to claim 20 or 21, in which the at least one floor spacer and the locking means or the detent springs are so matched to each other that te by the Arretierungskräf or the spring forces of the detent springs in the operating position of the bottom heater ( 7 ) on the or a spring force acts in the floor spacer. 23. Oven muffle according to one of the preceding claims, in which the lower heat radiator ( 7 ) has connection areas which pass through respective openings in the muffle rear wall or one of the muffle side walls, and in the lower heat radiator ( 7 ) on the side in the muffle interior ( 4 ) in close proximity to the connection areas each have a curvature area ( 18 ) with a curvature facing away from the muffle base ( 6 ). 24. Cooking oven with at least one oven muffle after one of the preceding claims. 25. Cooking oven according to claim 24 with switching means for interrupting the electrical power supply for the Unterhit zeheizkörper ( 7 ) as soon as the Unterhitzeheizkörper ( 7 ) is pivoted out of the operating position.