TEMPERATURE-CONTROLLED DEVICE FOR SWITCHING OFF A HEATING INSTALLATION

Abstract

A temperature-controlled device for switching off a heating device at a limit temperature has a thermo-mechanical temperature sensor device, a switch-off device, and manual reactivation means. The switch-off device has switching means which are activated by a trigger for switching off the heating device. The manual reactivation means have a movable handle and transmission means for transmitting a force of an operator for reactivating the switching means after switching off the heating device by the trigger. The transmission means have a click spring which at the beginning is in a basic position and, when an operating force acting on said click spring exceeds a certain limit force, clicks to a deflected position. Said click spring in the basic position enables reactivating or re-switching on, respectively, of the switching means. Said click spring in the deflected position releases so much movement path on the transmission means for the switching means that said switching means by the temperature sensor device and by the switch-off device above the limit temperature are activatable and switchable by the trigger.

Claims

1. Temperature-controlled device for switching off a heating device at a certain limit temperature, said temperature-controlled device having: a thermo-mechanical temperature sensor device; a switch-off device, manual reactivation means, wherein said temperature sensor device has: a thermo-mechanical temperature sensor; a trigger, wherein said switch-off device has switching means, which switching means for switching off said heating device are activatable and switchable by said trigger, wherein said switching means are configured for installation in a path of an energy supply to said heating device, wherein said manual reactivation means have: a movable handle for transmitting an operating force of an operator for reactivating said switching means or re-switching on said switching means after switching off said switching means by said trigger; transmission means between said handle and said switching means, said transmission means being connected in a force-transmitting manner to said handle, wherein said transmission means have a click spring which in said line of said operating force that acts thereon from said handle, up to a certain limit force, is in a basic position as a first position and, when said operating force acting on said click spring exceeds said limit force, clicks to a deflected position as a second position; said click spring in said basic position reactivates said switching means or re-switches on said switching means; said click spring in said deflected position releases so much movement path on said transmission means for said switching means that said switching means by said temperature sensor device and by said switch-off device at a temperature above said limit temperature are activatable and switchable again for switching off said heating device by said trigger.

2. Device according to claim 1, wherein detent means for a maximum movement path relative to said device are provided for said handle.

3. Device according to claim 2, wherein said detent means are configured as compression detents.

4. Device according to claim 2, wherein said detent means are configured so as to be sleeve-like and proceed from said handle towards said housing of said device and herein at least partially engage across said transmission means.

5. Device according to claim 1, wherein said click spring is planar and is curved in one direction.

6. Device according to claim 1, wherein said click spring is monostable, wherein a basic position is said stable position.

7. Device according to claim 1, wherein a trigger force exerted by said trigger in said device acts counter to said operating force exerted on said handle by said operator, wherein said click spring is disposed in said force path between said trigger force and said operating force.

8. Device according to claim 7, wherein said click spring is configured in such a manner that said limit force is less than said trigger force which has been generated by said trigger at a temperature increase beyond said limit temperature.

9. Device according to claim 7, wherein a path differential between said basic position and said deflected position on said click spring is so large that, when exceeding said limit temperature, exerting a trigger force on said trigger lever and said rocker by said trigger moves said rocker counter to said force of said click spring so far that said rocker switches off said switching means.

10. Device according to claim 1, wherein said handle acts directly against said click spring and bears on the latter.

11. Device according to claim 10, wherein said handle bears so as to be approximately centric on a click spring, wherein said click spring is planar and is curved in one direction.

12. Device according to claim 1, having a pressure arm and a rocker, wherein said rocker has a bearing point, and wherein said pressure arm is configured so as to be pivotable and is mounted in such a manner that said handle by way of said operating force acts on said pressure arm so as to move the latter, wherein said pressure arm, when reactivating or re-switching on, on a first side of said bearing point is pushed against said rocker, wherein said rocker, by way of movement thereof, on another, second, side of said bearing point releases a movement path for said switching means so as to thus be able to close said switching means.

13. Device according to claim 12, wherein said rocker is configured so as to be bistable and in a free position as a first position does not activate said switching means, or said switching means are not influenced by said rocker, wherein said rocker in a blocking position as a second position forcibly opens said switching means and keeps the latter opened.

14. Device according to claim 12, wherein said trigger acts on a trigger lever by way of an increasing deflection of said trigger lever as said temperature rises at said temperature sensor, wherein said trigger lever is disposed between said trigger and said switching means.

15. Device according to claim 14, wherein said trigger lever is disposed between said trigger and said rocker.

16. Device according to claim 15, wherein said trigger lever at an increasing temperature at said temperature sensor pushes against said rocker in such a manner so as to push the latter from said free position to said blocking position.

17. Device according to claim 12, wherein said pressure arm has a main body which is configured for said force transmission of said operating force, wherein said operating force is a compressive force.

18. Device according to claim 17, wherein said main body is configured as a double bridge having two longitudinal arms which extend in each case from a mounting at one end, where said longitudinal arms are connected to said device, wherein said longitudinal arms for connection therebetween have at least one transverse arm.

19. Device according to claim 18, wherein two said transverse arms having a mutual spacing are provided between said two longitudinal arms in such a manner that a free intermediate space is formed between said two transverse arms and said two longitudinal arms, wherein a bend of 70 to 110 is provided behind said second transverse arm or behind said click spring.

20. Device according to claim 17, wherein said click spring is integrated in said transmission means in such a manner that said transmission means are configured from sheet metal in one part together with said click spring and said main body and so as to be integral to said click spring and said main body.

21. Device according to claim 17, wherein said click spring is connected to said transmission means in such a manner that said click spring is connected to said main body in a form-fitting or materially integral manner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Exemplary embodiments of the invention are schematically illustrated in the drawings and will be explained in more detail hereunder. In the drawings:

[0032] FIG. 1 shows an internal view of a device according to the invention as a limiter in a deep fryer at a low temperature;

[0033] FIGS. 2 to 5 show various functional states of the limiter according to FIG. 1;

[0034] FIG. 6 shows an enlargement of a pressure arm having a click spring in the non-depressed state as the basic position, in an oblique illustration;

[0035] FIG. 7 shows the pressure arm from FIG. 6 in a side view;

[0036] FIG. 8 shows the pressure arm from FIG. 7 having the click spring in the depressed state as the deflected position; and

[0037] FIG. 9 shows a pressure arm of an alternative configuration, having an integrated click spring in an illustration similar to that of FIG. 6.

DETAILED DESCRIPTION

[0038] A deep fryer 11 as an appliance, or an electrical appliance, respectively, as has been described at the outset is illustrated in FIG. 1 and in a similar manner in FIGS. 2 to 5. The deep fryer 11 in a known manner has a housing 12 and a fry pot 13, a heating device 16 being disposed in the interior space 14 of said fry pot 13, said heating device 16 usually running freely indeed and advantageously being formed by a tubular heating element. Frying fat which is heated by the heating device 16 is filled into the fry pot 13. A current supply 18 for the heating device 16, in which a switch-off device 31 as part of the limiter 20 sits or is integrated in the circuit, is illustrated in a highly simplified manner. A temperature regulator can be additionally provided. In the case of an excessive temperature, the heating device 16 as a safety measure is to be able to be switched off by a temperature sensor device 22 which sits in a housing 21 of the limiter 20. The temperature sensor device 22 in a manner known has a thermo-mechanical temperature sensor 24 which is composed of a short thick sensor 25 and a pipeline 26 connected thereto. An expansion fluid as described above is situated in the hollow sensor 25 as well as in the pipeline 26. The pipeline 26 is in fluid connection to a diaphragm box 28 as the trigger described at the outset. The diaphragm box 28 in a manner known can expand downwards, as is shown above all by the comparison with FIG. 2, when a volumetric expansion is performed by virtue of an increasing temperature of the expansion fluid in the temperature sensor 24, said volumetric expansion taking place in this instance precisely also in the diaphragm box 28 and generally causing an expansion of the diaphragm box 28. Since said diapraghm box 28 in an upwards manner is fastened to the housing 21 of the limiter 20, said diapraghm box 28 expands downwards. The actual force of the diapraghm box 28 in this instance is transmitted by a pressure protrusion 29 which is attached to the lower side. All this has been known for some time in the prior art.

[0039] The afore-mentioned switch-off device 31 per se is composed mainly of switching means 38 in the form of an elongate and elastic switch spring 39 which is fastened at the right end thereof. Said switch spring 39 is advantageously also electrically contacted at said right end. The switch spring 39 at the left free end supports a contact head 40 by way of which said switch spring 39, on account of the pretensioning thereof, bears so as to push on a counter contact head 41 and closes the contact or the switching means 38, respectively. Since the switching means 38 here are very simple, but a switching procedure by way of the spring-elastic switch spring 39 is to be performed rapidly or abruptly, respectively, a transmission pin 37 is mounted so as to be longitudinally movable in the housing 21, on the one hand. Said transmission pin 37 bears on the switch spring 39 and in some circumstances can also be fastened thereto. The switching means 38 can be opened by means of said transmission pin 37. To this end, the switch-off device 31 has a rocker 33 which by means of a rocker rotation point 36 is mounted in the housing 21, wherein the mounting can be a so-called knife-edge mounting which is known per se. A left rocker arm 33a protrudes beyond the transmission pin 37. A rocker spring 35 which is flexed upwards under compressive stress is brought to bear against the end side of said rocker arm 33a that points to the left, said end side being notched. Said rocker spring 35 by way of the left end thereof is supported on a mount in the housing 21.

[0040] A right rocker arm 33b of the rocker 33 is significantly shorter and supports an adjustment screw 34 screwed thereinto. The deflection of the rocker 33 in the position illustrated here, but above all also the activation thereof according to FIG. 4, can be set by way of said adjustment screw 34.

[0041] Rockers 33 of this type, or the entire switch-off device 31, respectively, for this purpose are also known from the prior art. The rocker 33 is obviously configured so as to be bistable. Said rocker 33 in the free position as a first position illustrated in FIG. 1 is rotated to the maximum towards the right, the adjustment screw 34 bearing on part of the housing 21. An imaginary connecting line can be drawn between the rocker rotation point 36 and the end of the rocker spring 35 bearing on the left, and when the point where the right end of the rocker spring 35 bears on the left rocker arm 33a lies above said imaginary line, the rocker is precisely in a free position. When the rocker 33 is moved in a counter-clockwise manner, or when the left rocker arm 33a is pushed downwards while correspondingly pivoting the rocker 33, the bearing point of the right end of the rocker spring 35 approximates the afore-mentioned imaginary line. When said bearing point transgresses said line, the rocker 33 in a manner known clicks downwards. Said rocker herein can strike downwards so far until the adjustment screw 34 finds an upwards detent, on the one hand, which will yet be explained in more detail hereunder. Said rocker 33 herein furthermore strikes from above onto the transmission pin 37, striking the latter towards the bottom, on account of which said transmission pin 37 in turn abruptly moves the switch spring 39 downwards so as to separate the contact head 40 and the counter contact head 41. This is illustrated in FIG. 2.

[0042] In order for this movement of the rocker 33 now to be caused, a trigger lever 64 which at the left end thereof is pivotally mounted, for example also by way of an afore-mentioned knife-edge mounting, is provided between the rocker 33 and the diaphragm box 28. A downwards-pointing trigger protrusion 65, for example as a tab bent out in a downwards manner, is provided in the trigger lever 64. This trigger protrusion 65 in a movement of the trigger lever 64, or in the downwards pivoting of said trigger lever 64, respectively, pushes on the rocker 33, as described above. To this end reference is also made to FIG. 2.

[0043] The trigger lever 64 at the right end has in elongate and screw-fittable trigger detent 67. By way of the latter it can optionally be set how far the trigger lever 64 strikes from below on a part of the housing 21 where the afore-mentioned adjustment screw 34 can also impact in a downwards manner. The trigger lever 64, for example by way of a spring (not illustrated here), can furthermore be pulled upwards, or pivoted in a counter-clockwise manner, respectively, in such a manner that said trigger lever 64 at all times bears on the pressure protrusion 29 of the diapraghm box 28. Said trigger lever 64 can thus not push downwards against the rocker 33 in a self-acting manner and cannot undesirably influence said rocker 33.

[0044] When the temperature in the fry pot 13 in the operation of the deep fryer 11 now rises, and the frying fat situated in the interior 14 of said fry pot 13 potentially reaches an excessive temperature, which can become very dangerous for reasons of spontaneous combustion, the temperature sensor device 22 intervenes. The expansion fluid in the sensor 25 and in the pipeline 26 expands specifically by virtue of the increasing temperature and herein in a known manner causes a downwards expansion of the diapraghm box 28. The pressure protrusion 29 pushes the trigger lever 64 downwards, or pivots the latter in the clockwise manner, respectively. At a specific point herein the trigger protrusion 65 comes to bear on the rocker 33 and pushes said rocker 33 downwards as the diapraghm box 28 increasingly expands. When a transition point as has been previously described of the bistable rocker 33 is exceeded herein, said rocker 33 clicks from the free position to the blocking position which is precisely illustrated in FIG. 2. Said rocker 33 herein has struck the transmission pin 37 downwards, and said transmission pin 37 by way of the switch spring 39 has pushed the contact head 40 away from the counter contact head 41. The switch-off device 31 has thus been activated or switched in order for the heating device 16 to be isolated from the current supply 18 so as to prevent any further heating. As can be seen from the free position of the rocker 33, illustrated in dashed lines in FIG. 2, the rocker 33 between the free position and the blocking position already moves by a certain distance, or by a path, respectively, of approximately 2 mm to 4 mm, on the transmission pin 37. Said two positions can also be set or influenced, respectively, by the adjustment screw 34.

[0045] Since the heating device 16 is now switched off, the temperature in the fry pot 13 drops again, this being registered by the temperature sensor device 22. The expansion fluid increasingly contracts, the diaphragm box 28 consequently also being increasingly contracted towards the top. This can be seen in FIG. 3. For the sake of simplicity, the state of the diaphragm box 28 in FIG. 3 corresponds to that of FIG. 1, this however not being therefore mandatory. In any case, it is important to see that the trigger lever 64 is also moved upwards again, or is pivoted in a counter-clockwise manner, according to FIG. 1. If the diapraghm box 28 were to be expanded somewhat more at a somewhat higher temperature than in FIG. 1, and the trigger lever 64 were thus to be pivoted somewhat further in the clock-wise manner, or downwards, respectively, this would however also not change anything. It can be seen from the position of the rocker 33 in the free position (illustrated in dashed lines) that the trigger protrusion 65 of the trigger lever 64 would still be significantly thereabove and thus would not affect the rocker 33.

[0046] However, the rocker 33, by virtue of the bistable design embodiment thereof, remains so as to be pushed downwards in the blocking position according to FIG. 2. On account thereof, the switching means 38 also remains forcibly opened, or a spring force of the switch spring 39 is significantly insufficient in order for the rocker 33 by way of the transmission pin 37 to be pushed upwards beyond the transition point of said rocker 33. This is precisely also the intention; after all, the limiter 20 operates in a different manner than a pure temperature regulator. The intervention of the limiter 20, or the switching-off of the switching means 38, respectively, as a safety measure is specifically to have the effect that manual reactivation or re-switching on, respectively, is necessary. Ultimately, an operator is intended to personally check directly and reliably whether a dangerous operating state has not potentially arisen at the deep fryer 11.

[0047] The operator for renewed switching-on of the heating can now activate reactivation means 44 and to this end push a pushbutton 46, as is visualized in FIG. 4. The pushbutton 46 has an encircling detent ring 47 which points downwards towards the housing 12 and which causes a maximum depression capability. The latter here in FIG. 4 has however not yet been reached. A transmission means 48 according to the invention is provided in or on the pushbutton 46. The transmission means 48 have a tappet 50 which is connected to the pushbutton 46.

[0048] As can be seen from the comparison of FIG. 3 and FIG. 4, the tappet 50 in this instance pushes downwards onto a pressure arm 52 which at the left end thereof is connected to the housing 21 of the limiter 20, or pivots said pressure arm 52 in the clock-wise manner about the bearing point. The pressure arm 52, in a manner similar to the rocker 33 and the trigger lever 64, is configured so as to be relatively stable and indeed inflexible. Said pressure arm 52 can indeed be composed of a relatively thin sheet metal, as can be seen at the extreme left, but for enhanced stability in a manner known has corrugations or embossed features, respectively, as will be explained hereunder in the context of FIGS. 6 to 9. Pushing the pressure arm 52 downwards by the tappet 50 has the effect that a pressure arm end 53 which is angled to the right in a downwards manner and which can also be seen in FIG. 1, is pushed downwards, the adjustment screw 34 in the rocker 33 also bearing on the lower end of said pressure arm end 53. This proceeds so far that the rocker 33 is again pivoted in the clock-wise manner, and the left rocker arm 33a is moved beyond the dead centre in an upwards manner, such that the rocker 33, activated by the rocker spring 35, strikes upwards. The adjustment screw 34, according to FIG. 1, in this instance, impacts in a downwards manner, this corresponding to the free position. The pressure arm end 53 of the pressure arm 52 furthermore pushes against the adjustment screw 34, or pushes the latter downwards, respectively, in the case of the operator continuing to push the pushbutton 46. A further movement in this direction is not possible on account of the adjustment screw 34 impacting in a downwards manner.

[0049] The pressure arm 52 at the left end has a spring region 54. The spring region 54 pushes the pressure arm 52 upwards, or causes a rotation in a counter-clockwise manner, respectively. This is achieved by the inherent material elasticity; the pressure arm 52 is advantageously composed of spring-elastic sheet metal.

[0050] It can be seen from FIG. 4 that the transmission pin 37 has been released by the rocker 33, and the switch spring 39 can again push said transmission pin 37 upwards and above all, by way of the contact head 40, can again bear on the counter contact head 41. The switching means 38 is thus closed again, and the heating device 16 can operate again.

[0051] As is, a purposeful and safe state could have now been re-established, and the deep fryer 11 could continue to safely operate again, respectively. However, a look at FIG. 4 shows that there is the issue of a blockage now arising at a renewed temperature increase by way of the expansion of the diaphragm box 28 and the downwards movement of the pressure protrusion 29 and the trigger lever 64. The trigger lever 64 would indeed attempt to push the rocker 33 downwards again by way of the trigger protrusion 65. However, the rocker 33 per se cannot move because the activated reactivation means 44, or the pushbutton 46 held depressed by the operator, respectively, prevent this by way of the force transmission via the transmission means 48 on the pressure arm 52. Specifically, the right rocker arm 33b having the adjustment screw 34 is firmly pressed downwards by the pressure arm 52, or the upwards path of said right rocker arm 33b is blocked, respectively. In order for no damage to arise herein and the functioning of the limiter 20 counter to an excessive temperature to nevertheless be able to be ensured, a click spring 57 is provided in the transmission means 48 (cf. also FIGS. 6 to 9).

[0052] As can be seen from FIG. 5, and as is shown in detail in FIGS. 6 to 8, the trigger lever 64 in the case of an expanding diaphragm box 28 pushes the rocker 33, or the left rocker arm 33a, respectively, downwards such that the right rocker arm 33b is pushed upwards. Pressure is thus transferred by way of the pressure arm end 53 onto the pressure arm 52 which by way of the click spring 57 pushes against the tappet 50 from below. However, since the operator continues to push the pushbutton 46 from the front, or even pushes the latter against the housing 12, respectively, such that the detent ring 47 bears on the front side of the housing 12, the tappet 50 cannot be pushed out of the limiter 20. The risk of damage would therefore exist here, since the diaphragm box 28 continues to expand since the heating device 16 continues to operate, or is not yet switched off, respectively, and the two forces oppose one another. The force for clicking the click spring 57 as the limit force is however now chosen in such a manner as has been explained at the outset, that said click spring is depressed at a force of approximately 50 N, for example, and herein clicks downwards. This can be seen from the comparison of FIGS. 7 and 8, wherein FIG. 7 corresponds to the state of FIG. 4, and FIG. 8 corresponds the state of FIG. 5.

[0053] In this downwards clicking of the click spring 57 a path of approximately 1 mm to at most 4 mm is traveled as soon as the click spring 57 after exceeding the transition point thereof clicks downwards to the deflected position. The diaphragm box 28 can now continue to expand, or by way of the pressure protrusion 29 move downwards without having to be pushed counter to a strong force. The click spring 57, configured so as to be monostable, by way of the restoring force thereof does indeed attempt once more to return to the original shape thereof according to FIG. 7. However, said force can be significantly lower, for example can be 10 N to 30 N, this causing only a minor stress to the participating parts in the force transmission, specifically to the trigger lever 64, the rocker 33, and the pressure arm 52.

[0054] The restoring force of the click spring 57 can even be so minor that said restoring force, in the case of the chosen lever ratios and the design embodiment of the rocker spring 35, is not sufficient for the right rocker arm 33b to be pushed downwards counter to the force of the rocker spring 35. The rocker 33, after the left rocker arm 33a has been pushed downwards by the trigger protrusion 65 of the trigger lever 64 by virtue of the expansion of the diapraghm box 28, thus remains in the position according to FIG. 5. Specifically, the left rocker arm 33a, on account of said expansion of the diaphragm box 28, has been struck downwards, on account of which the transmission pin 37 has separated the switching means 38. The state of FIG. 5 can be present immediately thereafter.

[0055] As can also be seen from FIG. 5, the heating device 16 is switched off, and the diaphragm box 28, by virtue of the temperature now dropping, retracts upwards again, accompanied by a corresponding movement of the trigger lever 64 in a counter-clockwise manner. However, the bistable rocker 33 remains in the blocking position illustrated in FIG. 5, despite the operator continuing to push the pushbutton 46, or pushing the latter against the front side of the housing 12. The restoring force of the click spring 57 alone does indeed not suffice in order for the rocker spring 35 to be overcome.

[0056] It is only when an operator releases the pushbutton 46 that the latter can jump out to the position illustrated in dashed lines, specifically because the monostable click spring 57, by way of a central region 58 on which the lower side of the tappet 50 bears, then jumps upwards in a self-acting manner. The state of FIG. 2 is then present, specifically also having opened switching means 38. An operator can only now again push the pushbutton 46 for reactivating or re-switching on, respectively, the switching means 38, as has already been explained in the context of FIG. 2. The force of the click spring 57 as a limit force required for depressing is specifically higher than the force which is required for pushing the right rocker arm 33b downwards and for pivoting the rocker 33 in the clock-wise manner, counter to the force of the rocker spring 35. This has been explained above.

[0057] The click spring 57 on the pressure arm 52 can be better seen in FIGS. 6 and 7. The pressure arm 52 has two pressure arm ends 53a and 53b which are bent downwards and reach up to a main body 56. In the other direction, the spring regions 54a and 54b proceed in a similar manner from the main body 56, said spring regions 54a and 54b in this instance being fastened to the housing 21 of the limiter 20 from below, according to FIG. 1. In each case one embossed feature 55a and 55b, respectively, extends from the spring regions 54a and 54b through the main body 56 into the pressure arm ends 53a and 53b. Said embossed features 55a and 55b can be seen in FIG. 7 and impart the entire pressure arm 52 with stability against flexing.

[0058] The click spring 57 is placed on top of the main body 56, or is fastened thereabove. The click spring 57 has a curved central region 58 and four peripheral concavities 60a to 60d which therebetween have in each case one bearing foot 62a to 62d. The click spring 57 by means of said bearing feet 62a to 62d is fastened, advantageously welded, to the pressure arm 52 in the region of the main body 56.

[0059] The side views of FIGS. 7 and 8 show how the click spring 57 in the basic position in FIG. 7 is curved upwards by way of the central region 58. It can be seen how the bearing feet 62a and 62b by way of a peripheral concavity 60a therebetween bear on top of the pressure arm 52 in the region above the main body 56. Said bearing feet 62a and 62b can be fixedly welded here. The entire pressure arm 52, despite being composed of a relatively spring-elastic material, is stabilized by the elongate embossed features 55a and 55b.

[0060] When a force F as aforementioned operating force, illustrated in FIG. 8 by the solid arrow, now pushes from above onto the central region 58 on the click spring 57, and when the pressure arm end 53 cannot yield downwards, the click spring 57 strikes downwards as soon as the operating force F exceeds the afore-mentioned limit force of, for example, approximately 50 N. As can be seen, a path of a few millimetres, here advantageously 1 mm to 4 mm, is traveled here. Since the click spring 57 is configured so as to be monostable, said click spring 57 in the absence of the force F would immediately click upwards again, or by way of an afore-mentioned restoring force push upwards, respectively. Said restoring force is significantly lower than the force required for clicking downwards and can be, for example, 10 N to 30 N. This arrow of the operating force directly aims at and goes through the click spring 57.

[0061] A modification of a pressure arm 152 which also has two pressure arm ends 153a and 153b which point downwards towards the right and which are brought together in a main body 156 is illustrated in FIG. 9. Embossed features 55a and 55b terminate ahead of said main body 156. Two spring regions 154a and 154b which in each case also have embossed features 155a and 155b proceed from the main body 156 in the other direction. The main body 156 per se forms the click spring 157 here, or is configured in a corresponding manner, respectively, and is above all curved upwards having an elevated central region 158 which here is indicated by corresponding indicator lines. Said click spring 157 also has four peripheral concavities 160a to 160d, because outriggers 162a to 162d are configured therebetween.

[0062] The design embodiment of such an integration of the pressure arm 152 and the click spring 157 in terms of construction and production is not that simple, but has the great advantage of greater integration. The welding of the click spring 57 to the main body 56, or to the pressure arm 52, respectively, according to FIGS. 6 to 8 can be dispensed with in this instance. The force ratios of the click spring 157 are advantageous in a manner similar to that explained above; said click spring 157 is likewise also preferably configured so as to be monostable. Said click spring 157 in this instance does not have to be reset, this under certain circumstances potentially being difficult in mechanical and technical terms also.

[0063] The object of a permanent blockage of the switching-off of the heating device 16 in the deep fryer 11, potentially desired by an operator, being suppressed even when the pushbutton 46 for reactivating the switching means 38 is permanently depressed, or is held up to the detent, respectively, can thus be achieved by way of the invention. Appliance safety is thus maintained at all times.