DE8132008U1 - "Electrically heated kettle" - Google Patents

Description

Mülbergerstrasse 65 Authorized representative at Patent attorney D-7300 Esslingen European Patent Office Dipl.-Ing. Volkhard Kratzsch Telephone Stuttgart (0711) 317000 Deutsche Bank Esslingen 210906 cable «krapatent» esslingenneckar Post office Stuttgart 10004-701

ABC electrical appliances VoIz, GmbH & Co. October 23, 19Θ1

7312 Kirchheim / Teck attorney's file 3299

Electrically heated kettle

The invention relates to an electrically heated kettle as defined in the preamble of claim 1 Art.

A well-known kettle of this type (CDE-AS 12 43 358) has a chamber in a separate switch housing, which is attached to the container wall at a distance, a steam-responsive switch in the form of a bimetal switch. The chamber has a lower steam inlet opening and an upper vent but not in the immediate vicinity of its lower steam inlet opening Connection with the inside of the container. Rather, the container wall delimiting the interior of the container runs at a distance from the lower steam inlet opening, whereby the container wall is perforated approximately in the region of the steam inlet opening in order to enable steam to be discharged here. Since this breakthrough opens out freely, the steam from the inside of the container can freely escape to the outside and to the environment where it can cool down relatively quickly. It is therefore highly questionable whether in the separate

Patent attorney Mülbergerstrasse 65 Authorized representative at Dipl.-lng. Volkhard Kratzsch D-7300 Esslingen European Patent Office Telephone Stuttgart (0711) 317000 Deutsche Bank Esslingen 210906 cable «krapatent» esslingenneckar Postschedcamt Stuttgart 10004-701

ABC electrical devices VoIz, GmbH & Co. 7312 Kirchheim / Teck

October 23, 1981 Attorney File 3299

summary

Electric kettle with heating element and temperature-dependent dry boil protection switch as well as on Steam action appealing switch inside the handle. The latter sits inside a chamber and works on a manually re-engaging actuator. The boil-dry protection switch has its own, re-engaging actuator and consists of a ready-to-install, containing the actuator, commercially available complete module. The other switch is also combined with its control element to form one component and designed as the same complete module, each of which is independent of the other when responding to the heating element switch off and with its actuator or control element into a stable one that visibly indicates the switch-off Rest position can go. The one that responds to the action of steam The switch consists of a spring washer temperature limiter with an outwardly guided transmission pin on which a manually actuated pressure member engages, and sits on the upper edge of the container wall with 'opposite this set back Sensor area. The interior of the chamber stands over steam inlet slots with the inside of the container and via steam outlet slots in connection with the environment, so that there is a good flow of steam and rapid cooling. The desk can be switched on again quickly. Both switches are connected in series with the heating element and with an electrical control lamp.

Chamber through the lower steam inlet opening steam at all can occur in order to open the bimetal switch responding to the action of steam. The bimetal switch works mechanically via a plunger on a pivoting control element, which in turn acts on the switching contacts a switch located in the supply circuit of the heating element acts. Does the said pear speak tall switch, the actuator is moved mechanically, which in turn mechanically moves the switch in the circuit the heating element opens «

The kettle described also has a temperature-dependent working dry-boil protection switch, which also consists of a bimetal switch and the also works via mechanical transmission elements on the pivotable, explained adjusting element, just like the switch that responds to the action of steam.

This training is relatively complex and expensive and also very large in volume.

The invention is based on the object of a kettle of the type mentioned to create the terms the design of the dry-boil protection switch and the switch that responds to the action of steam can be designed simply and cheaply, with little space required to accommodate both switches is and it is ensured with simple means and in a space-saving manner that the action of steam appealing switch is actually willingly washed around by developing steam and afterwards can cool down again as quickly as possible, so that this switch can be switched on again in a relatively short time is available.

In the case of an electrically heated kettle, the task is as defined in the preamble of claim 1

Genus according to the invention by the features in the identification part of claim 1 solved. It is advantageous if each complete module consists of a commercially available, completely adjusted and immediately ready-to-use component. That way the cost will be and the other costs for both switches are kept as low as possible. The way is opened up to be able to fall back on commercially available components that are otherwise used for completely different purposes, which are factory-adjusted, customary in the trade and already approved by the examination bodies, e.g. VDE.

Further advantageous designs emerge from claims 3-15. The one that responds to the action of steam The switch is located here with the sensor surface of its encapsulated housing at a distance from the inside the container wall, the distance z. B. 10 mm can. The sensor surface is so to speak in the shadow of the interior of the container with which the chamber is located the steam inlet openings, e.g. steam inlet slots, in connection stands. This is sufficient because the slight excess pressure of the steam also passes through the slots Chamber can penetrate and so the somewhat remote sensor surface can be coated well. Because of the steam outlet slots On the one hand, the sensor surface is well rinsed with steam and, on the other hand, it is as good as possible fast recooling and possibility of re-use of the Reached the action of steam responding switch. Because of this spatial arrangement is therefore after the switch has responded to the action of steam and shutdown the power supply for heating element achieved a rapid re-cooling of the switch, so that the switch very can quickly return to the starting position. The fact that the switch has responded will to the outside through the latching position that remains stable in dBr Pressure link made visible by hand

re-engages to get the switch back on its Bring starting position. It has been shown that the period of time until the renewed switching capability is reached could be reduced to a few seconds due to the design according to the invention.

Further details and advantages emerge from the following description.

The full text of the claims is above not reproduced to avoid unnecessary repetitions, but instead only by naming the Claim number is referred to, whereby all of these claim features are expressly stated at this point and are essential to the invention.

The invention is explained in more detail below with reference to an embodiment shown in the drawings. Show it:

1 shows a schematic section of an electrically heated kettle,

2 shows a schematic section along the line H-II in Fig. 1,

Fig. 3 is a side view of a detail in the direction of arrow III in Fig. 1,

Fig. 4 is a schematic circuit diagram.

Dbt kettle 10 shown in the drawings consists of a container 11 with container wall 12, laterally engaging handle 13 and lid 14 Electric heating element 15 is used to heat the kettle 10. The handle 13 is hollow inside and forms with the hollow interior 16 generally a switch housing in which various switches described below are accommodated.

In the interior 16 of the handle 13, on the one hand, it is temperature-dependent operating dry-boil protection switch 20 included, which is designed here as a liquid temperature limiter is. In the area of the heating element 15 there is a capillary sensor 21> which is in thermal contact therewith via a liquid line (not shown) with the dry-boil protection switch 20 communicates. If, for example, the user of the kettle 10 forgot to fill it with water, or should the kettle 10 run dry for any other reason, the heat of the will overheat Heating element 15 passed through the capillary sensor 21 to the boil-dry protection switch 20, which then responds and opens. The dry-boil protection switch 20 is connected as a series switch in series with the heating element 15, its power supply is therefore interrupted when opening the boil-dry protection switch 20.

The dry-boil protection switch 20 has its own, re-engaging Actuator 22, for example in the form of a button, which through the wall 17 of the handle 13 through to the outside occurs. When the boil-dry protection switch 20 is open and the heating element 15 has been disconnected from the power supply, the dry-boil protection switch 20 and / or the actuator 22 takes a stable latching position in this switched-off position which is made visible, for example, by the fact that the actuator 22 is pushed out. The boil-dry protection switch 20 remains in this switched-off position until the actuator 22 is manually operated again is engaged, that is to say, pressed in in the present case, and thus the boil-dry protection switch 20 is closed again will.

The dry-boil protection switch 20 consists of a complete Ready-to-install complete module containing the actuator 22. Such a complete module is commercially available and can be factory-adjusted and e.g. provided with VDE approval can be obtained. The effort for this is extremely low,

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In the event of malfunctions or damage, the same applies accordingly a quick and easy exchange possible, also at low costs.

It goes without saying that in another exemplary embodiment, not shown, the boil-dry protection switch 20 also can be designed differently, e.g. as a bimetal switch or other thermostatically controlled switch.

In the interior 16 of the handle 13 is also a Temperature-dependent switch 30 that is appropriate for the action of steam is included. This sits in a Chamber 31 to which steam from the interior of the container 18 can be acted upon is. This switch 30 has the task of responding to the development of steam inside the container 1Θ and the To interrupt the power supply of the heating element 15 by opening the switch. The switch 30 is also a series switch connected in series with the heating element 15 (Fig. 4). Together with the dry-boil protection switch 20, it forms a Series connection, so that the power supply to the heating element 15 is switched off when the one switch 20 or else the other switch 30 has opened. The handle 13 also contains an electrical control lamp 19, which indicates whether the heating element 15 is connected to the power supply or not. The control lamp 19 is in Series connected to the heating element 15 and to the two switches 20 and 30 (Fig. 4), so that only if both Switches 20, 30 are switched on and the heating element 15 is fed, the control lamp 19 lights up. Goes out the latter, this is an optical signal for the user that the heating element 15 is switched off, namely in that either the boil-dry protection switch 20 or the other switch 30 have opened automatically and depending on the temperature. The control lamp 19 is located in the interior 16, where their lighting up through eir.3 transparent top cap 9 is visible to the outside, which is in the wall of the handle 13 is included.

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The steam-responsive switch 30 has its own re-engaging actuator 32 on which it operates. The switch 30 is combined with this re-engaging actuating element 32 to form one component and in this form consists of a complete module that can be installed. Advantageously, this complete module is commercially available and factory-adjusted and already available with test approvals, e.g. from the VDE. The effort for the switch is extremely low. Like the switch 2O ₁ , the switch 30 is also able to switch off the heating element 15 independently of the other switch when it is triggered. In this case, its re-unloaded adjusting element 32 can go into the stable latching position that visibly indicates the disconnection. Like the switch 20, the switch does not automatically switch back to the closed position after opening. Rather, this requires manual re-engagement by actuating the actuating element 32.

The switch 30 is a thermostatic spring-loaded disk temperature limiter educated. It has in the usual way a set according to its switching temperature, e.g. embossed, bimetal disc inside the switch housing 3; on, which works there on a transmission pin that is coupled to switching contacts and with one shown in FIG. 1 visible end portion 34 is led out of the switch housing 33, the end portion 34 itself being the actuating element can form or represent at least part of the actuating element. Inside the switch housing 33 a metallic spring washer is included, actuated by the bimetal disc, which is placed on the transmission pin works and after jumping into a stable jump position remains in the latter even when the bimetal disc automatically snaps back into its original position after cooling down. The jump disk remains with the transfer pin and adjusting element 32 in this stable jump position until the manual reset takes place,

The switch 30 responsive to the action of steam has a bottom-side sensor surface 35, which is at least approximately is aligned parallel to the container wall 12 (Fig. 1). With the sensor surface 35, the switch 30 is with respect to the Container wall 12 reset. The sensor surface 35 thus runs at a distance from the inside of the one shown in FIG. 1 right container wall 12, so that the sensor surface 35 to a certain extent lies in the shadow. The switch 30 is roughly in the shape of a pot. It is placed transversely to the axis of the container 11, namely in such a chamber 31, which sits in the upper container area and there to the side of the container wall and strives across it.

As FIG. 1 shows, the chamber 31 is located within the upper, approximately horizontal leg of the handle 13. In this upper leg, a pressure member 36 is also held in a horizontally displaceable manner. The pressure member 36 is with one end, on the left in FIG. 1, mechanically coupled to the end section 34 of the transmission pin of the switch 30, so that both parts form a pullable or slidable unit. With the other, in Fig. 1 right end the pressure member 36 is passed through an opening 37 in the wall 17 of the handle 13 to the outside. there is thus visibly displayed in which switch position the switch 30 is in each case, whether in the disengaged Switch-off position or in the switch-on position produced by manually pressing in the pressure member 36.

The switch 30 is within the chamber 31 by means of a Seal 38 kept sealed all around. The seal 38 is formed from a molded part made of EPM material. You guaranteed a reliable watertight seal on the side that the container interior 18 and the container wall 12 is turned away, so to the further right in Fig. 1 Innfinraum 16 of the handle 13, in which the other switches 20 and the electrical connection for the

- 13 power supply cables are located.

The chamber 31 is in the area of the container wall 12, FIG. 1 left, via steam inlet slots 39 with the interior of the container 1Θ fluidically connected. The container wall 12 is therefore level with the upper horizontal handle leg broken through to form the steam inlet slots 39. In the embodiment shown, the run Steam inlet slots 39 approximately at right angles to the bottom of the Container 11, here three such steam inlet slots 39 are provided. The passage cross-section of the steam inlet slots 39 is dimensioned so that thereby sufficient in the event of steam formation in the interior of the container 18 and due to the slight overpressure that the steam then has Steam get into the interior of the chamber 31 and there can easily wrap around the sensor surface 35 of the switch 30. Through this, that the sensor surface 35 extends at a distance from the inside of the container wall 12, the distance for example Can be 10 mm, the sensor surface 35 is so to speak in Shadow of the steam center. The vapor pressure causes nonetheless rapid and uniform application of steam, since the steam also passes through the steam inlet slots 39 can penetrate into the chamber 31. When the heating element 15 is switched off when the switch 30 responds when steam is generated there is a cooling in the interior of the container 18. Due to the spatial arrangement of the switch 30 can this cool down again very quickly, so that the switch 30 opens again in an extremely short time after it has automatically opened can be brought into the closed position by manual re-engagement and immediately again as a possible formation of steam monitoring, temperature-dependent switching element can be effective.

The chamber 31 also has steam outlet slots 40 which - viewed in the direction of the horizontal handle part - in Distance from the steam inlet slots 39 are arranged.

The steam outlet slots 40 are located in the wall of the upper part of the handle 13. In the embodiment shown, the steam outlet slots 40 in FIG down and up and inclined to the right. Two such outlet slots 40 are provided here sit on both sides of the handle wall 17. Because of these steam outlet slots, there is good flow the chamber 31 is achieved with steam and the cooling of the switch 30, in particular the sensor surface 35, is accelerated. This means that the switch 30 is ready to be switched on again even more quickly after it has been switched off depending on the temperature and can be re-indented manually.

Claims (15)

Expectations 1. Electrically heated kettle, with a heating element (15) and an outside switch housing with a temperature-dependent dry-boil protection switch (20) and a temperature-dependent operating, on the action of steam responsive switch (30) which can be acted upon within a with steam from the container interior (18) Chamber (31) is arranged and operates on a reengageable adjusting element (32), characterized in that that the boil-dry protection switch (20) has its own, re-engaging actuator (22) and consists of a ready-to-install, the actuator (22) containing complete module and that the action of steam appealing switch (30) with its re-engaging actuating element (32) also combined into one component and consists of a ready-to-install complete module, each complete module switching off the heating element (15) independently of the other when responding and switching it off with its reengageable actuator (22) or actuator (32) visibly indicating stable locking position can go. 2. Kettle according to claim 1, characterized in that that each complete module is made from a commercially available, pre-adjusted and ready-to-use Component consists. 3. Kettle according to claim 1 or 2, characterized in that the action of steam responsive switch [30) is designed as a thermostatic spring-loaded disk temperature limiter. 4. Kettle according to claim 3, characterized in that that the spring washer temperature limiter is set according to its switching temperature, in particular has embossed, bimetallic disk that works on a transmission pin that is coupled to switch contacts and led out with an end section (34) from the switch housing (33) which forms the adjusting element (32) or at least a part of it. 5. Kettle according to claim 4, characterized in that that the jump disk temperature limiter can be actuated by the bimetal disk and in turn contains the transfer pin actuating jump disk, which after jumping into a stable jump position in this also when the bimetal disc springs back into its starting position until it is mechanically reset by means of the Actuating element ve can stay. 6. Kettle according to one of claims 1 -5, characterized characterized in that the switch (30) which responds to the action of steam is a particularly stringed one Has sensor surface (35) which is aligned at least approximately parallel to the container wall (12). 7. Kettle according to claim 6, characterized in that that the switch (30) with its sensor surface (35) is reset with respect to the container wall (12) is and runs at a distance from this. 8. Kettle according to one of claims 1 -7, characterized in that the action of steam appealing switch C30) is roughly in the shape of a pot. 9. Kettle according to one of claims 1 -8, characterized in that the chamber (31), within the switch (30) which responds to the action of steam is arranged is, sits in the upper container area and there to the side of the container wall (12) and approximately transversely to this is arranged. 10. Kettle according to claim 9, characterized in that that the chamber (31) inside the upper, approximately horizontally extending leg of a hollow inside Handle (13) is formed on the container wall (12) attacks. 11. Kettle according to one of claims 1 - 10> thereby characterized in that a pressure member (36) is held within the upper leg, which with a The end is mechanically coupled to the end portion (34) of the transmission pin and to its other end, the container wall (12) facing away from the end through an opening (37) of the handle wall (17) is passed to the outside. 12. Kettle according to one of claims 1-11, characterized characterized that the on the action of steam responsive switch (30) is kept sealed all around within the chamber (31) by means of a seal (38), in particular the chamber (31) is sealed watertight on the side facing away from the container wall (12) is. 13. Kettle according to one of claims 1 - 12, characterized characterized in that the chamber (31) has steam inlet slots (39) in the region of the container wall (12), via which the chamber (31) is in communication with the container interior (18). -A- 14. Kettle according to one of claims 1-13, characterized in that the chamber (31) has steam outlet slots (40) spaced from the steam inlet slots (39) and in the Handle wall (17) which delimits the chamber (31) are arranged. 15. Electrically heated kettle, in particular according to one of claims 1-14, characterized by an electrical one arranged in the handle (13) Control lamp (18), which shows the switching status of the steam responsive switch (30) or the dry-boil protection switch (20) and thus the operating status of the heating element (15).