EP1251540A2 - Temperature limiter - Google Patents

Abstract

Temperature limiter comprising a switching head (18) containing at least one switching contact (19) and a temperature sensor (7) which is formed from elongated expansion elements (8, 9) which have different coefficients of thermal expansion, the expansion elements (8, 9) in the first, End region (100) spaced from the switching head (18) is held immovably with respect to one another and in the second end region (110) lying near the switching head (18) is movable with respect to one another, furthermore a plunger (16) is slidably mounted in the switching head (18), which is movably opposite the switching element (8) held by the expansion element (8, 9) and acts on the switching contact (19) via its foot-side end section (161), a switching sleeve (20) being placed on the foot-side end section (161) and being displaceably mounted opposite it , with which the switch contact (19) can be actuated and wherein the foot-side end section (161) of the plunger (1 6) is capable of being welded or soldered, and the switching sleeve (20) can be connected or connected to the foot-side end section (161) via a fusion weld connection or a soldered connection. <IMAGE>

Description

The invention relates to a temperature limiter comprising at least one Switch contact including switch head and a temperature sensor, which consists of elongated Expansion elements is formed, which are different from each other Have thermal expansion coefficient, the expansion elements in the first, from Switch head spaced end portion immovable to each other and in the second Switch head lying end are movable to each other, further in Switch head a plunger is slidably mounted on the movable relative to the switch head held expansion element abuts and on its foot end portion on the Switching contact acts, one placed on the foot-side end section, this is provided with respect to the displaceably mounted switching sleeve with which the switching contact can be actuated.

The switching temperature at which the switch contact is actuated by the plunger is from Distance between the switch contact and the tappet part that is on the switch contact acts, dependent. This distance must therefore be adjusted to set this switching temperature become.

This adjustment could be made, for example, by producing the plunger with correspondingly precise Dimensions or by mechanical reworking of the ram, e.g. accurate Cutting, grinding or the like.

In the prior art adjustment devices are also known, which one on the include foot-side end portion of the plunger shift sleeve, with which Switch sleeve the switch contact is actuated. There is an internal thread in the switching sleeve incorporated, in which a stud screw is screwed. The foot end face of this The stud screw is in contact with the plunger, which means that the switching sleeve is turned by turning the stud screw shifted towards the plunger and thus the switching temperature of the switching contact can be adjusted.

A disadvantage of the possibility of mechanical post-processing of the first discussed Tappet that they only in the not yet assembled state of the temperature limiter can be made or that the plunger to perform the operations again must be removed from the switch head. The adjustment of the switching temperature is therefore with relatively large technical effort.

The adjustment device having a stud screw initially has the disadvantage of Inaccuracy, since even slight twists in the stud screw are already relatively large Result in shifting of the switching sleeve. In addition, the stud can twisting over time, especially because they are exposed to frequent changes in temperature and often displacement forces are exerted on them. Such twists the However, the stud screw leads to an adjustment of the adjusted switching temperature.

It is an object of the present invention to provide a temperature limiter at the beginning to specify the type in which the adjustment of the switching temperature of the Switch contact connected with particularly little effort and with high accuracy can be carried out.

According to the invention this is achieved in that the foot-side end section of the plunger is weldable or solderable and that the switching sleeve has a Fusion welded connection or a soldered connection with the foot-side end section is connectable or connected.

The switching sleeve can be moved by any small distances and thus particularly position exactly. The welding or welding used to fix the switching sleeve on the plunger Solder connection is unsolvable, with which displacements of the switching sleeve - and associated with it Changes to the set switching temperature practically after completion of the adjustment excluded are.

According to a preferred embodiment of the invention it can be provided that the Switch sleeve via a laser welding or a laser solder connection to the foot side End section is connectable or connected.

Such a connection can be very easily in the assembled state of the Manufacture temperature limiter because it is used to heat the parts to be welded together or parts to be soldered used laser beam has a particularly small footprint.

In a development of the invention it can be provided that a grip aid on the switching sleeve, for example in the form of a pin or in the form of in the outer surface incorporated indentations or roughening, is fixed or can be determined.

This means the application of forces necessary to shift the shift sleeve are much easier.

It has been found to be particularly advantageous to use a helical compression spring, Proven spring, which the switching sleeve in the direction away from the foot end face of the Tappet preloaded.

The shift of the switching sleeve is thereby with relatively little additional effort considerably simplified: it only needs to shift the switching sleeve in the direction of the a tappet end face a force to be applied to the switching sleeve, the The switching sleeve is automatically moved back in the other direction by the Feather. It follows that to carry out the shift only to that of end face of the plunger facing away from the foot end of the switching sleeve must, what action via a worked into the side wall of the switch head Breakthrough can take place.

In addition, the shift of the switching sleeve in the direction of the foot side End face against a resistance, namely against the force of the spring. Such Displacement can be carried out with much greater precision than a completely free one, i.e. possible displacement without any resistance. The switching temperature can be so adjust particularly precisely.

According to a first embodiment of the invention, one on the foot side End portion applied metal layer may be provided, which makes it possible Weld the switching sleeve directly to the tappet. Additional components that the Making a connection between the switching sleeve and the plunger can allow thus saved.

In a further embodiment of this embodiment, one can be on the metal layer applied solder layer may be provided.

This allows between the switching sleeve and the metal layer applied to the plunger to make a soldered connection simply by heating the switch sleeve accordingly. The supply of a solder can be omitted, since it is already applied to the metal layer.

According to a second embodiment of the invention, one on the foot side End section placed and connected to this receiving sleeve provided which the switch sleeve is attached.

The effort associated with the production and application of such a receiving sleeve is less than that which is connected to the metallization of the foot-side plunger section is. The weldable or solderable surface required according to the invention can thus be used comparatively inexpensive and inexpensive on the foot-side tappet section muster.

In a further embodiment of the invention it can be provided that the receiving sleeve has a preferably annular, arranged at a distance from the front end of the switching sleeve Approach and that the spring is designed as a helical compression spring, which is at a distance is arranged between this approach and the front end of the switching sleeve.

The components required for adjusting the switching temperature thus form a compact one Unit that is first assembled for itself and then placed on the plunger can.

Fig. 1 einen Schnitt entlang der Linie I-I der Fig.2 eines Heizkörpers mit einem Temperaturfühler 7;

Fig.2 eine Draufsicht auf den Heizkörper nach Fig.1;

Fig.3 einen Längsschnitt durch eine erste gängige Konstruktionsweise eines Temperaturfühlers 7;

Fig.4 einen Längsschnitt durch eine zweite gängige Konstruktionsweise eines Temperaturfühlers 7;

Fig.5 einen gemäß einer besonders bevorzugten erfindungsgemäßen Ausführungsform gehaltenen Schaltkopf 18 bei abgenommenem Deckel im Grundriß, wobei der Temperaturfühler 7 gemäß der ersten, in Fig.3 dargestellten Konstruktionsweise aufgebaut ist;

Fig.6 und 7 andere erfindungsgemäße Ausführungsformen eines Temperaturbegrenzers jeweils in derselben Darstellung wie Fig.5, wobei auch hier der Temperaturfühler 7 jeweils gemäß der ersten, in Fig.3 dargestellten Konstruktionsweise aufgebaut ist und

Fig.8 einen gemäß einer besonders bevorzugten erfindungsgemäßen Ausführungsform gehaltenen Schaltkopf 18 bei abgenommenem Deckel im Grundriß, wobei der Temperaturfühler gemäß der zweiten, in Fig.4 dargestellten Konstruktionsweise aufgebaut ist.

The invention is described in more detail with reference to the accompanying drawings, in which particularly preferred exemplary embodiments are shown. It shows:

1 shows a section along the line II of Figure 2 of a radiator with a temperature sensor 7.

2 shows a top view of the radiator according to FIG. 1;

3 shows a longitudinal section through a first common design of a temperature sensor 7;

4 shows a longitudinal section through a second common construction of a temperature sensor 7;

5 shows a switching head 18 held in accordance with a particularly preferred embodiment according to the invention with the cover removed in plan, the temperature sensor 7 being constructed in accordance with the first construction shown in FIG. 3;

6 and 7, other embodiments of a temperature limiter according to the invention each in the same representation as FIG. 5, the temperature sensor 7 also being constructed here in accordance with the first construction shown in FIG

8 shows a switching head 18 held in accordance with a particularly preferred embodiment according to the invention with the cover removed in plan, the temperature sensor being constructed in accordance with the second construction shown in FIG.

1 and 2 show a possible field of application for an inventive Temperature sensor 7, but without restricting the invention to this area of application is.

1 with a radiant heater is referred to, which consists of a pot 2 in which a Spiral heating coil 3 is located, which is embedded in an investment 4. The Radiant heater 1 is arranged below the plate 5 made of metal, glass ceramic or the like. which forms the cooking surface 6. Between the cooking surface 6 and the heating coil 3 is the Temperature sensor 7 arranged which is connected to a switch head 18, the Temperature sensor 7 in a simple manner through holes in the radiant heater 1 is passed through.

The temperature sensor 7 is thus exposed to the temperature below the cooking surface 6 prevails in the radiation space between the cooking surface 6 and the heating coil 3 and can so that capture this temperature.

The construction of this temperature sensor 7 is shown in FIGS. 3 and 4:

Two elongate expansion elements 8, 9 are provided, which are separated from one another have different thermal expansion coefficients. These expansion elements 8.9 can be designed as bars and lying side by side. Preferably however, the first of these expansion elements 8 as a tube, in particular with circular cross-section, and the second expansion element 9 as a rod, preferably carried out with a circular cross section. The rod 9 is inside the Tube 8 arranged horizontally.

Subsequently, for the sake of clarity, the first expansion element 8 is only used as Tube 8 and the second expansion element 9 are only referred to as rods 9.

In the first end region 100, the tube 8 and the rod 9 are held immovably to one another, while they are held movable relative to one another in the second end region 110.

In the embodiment shown in FIG. 3, the expansion coefficient of the rod is 9 larger than that of the tube 8, which can be realized, for example, that the rod 9 from a metal and the tube 8 is made of a ceramic, such as cordierite in particular.

The immovable mounting of the rod 9 in relation to the tube 8 is in the first end region 100 realized by a stop 13 fixed to the rod 9, with which the first rod end can support at the first pipe end. This stop 13 can for example by a something permanently connected to the rod 9, e.g. welded or glued component can be formed. The stop 13 can also by a screw nut 14 which is threaded on provided first end of the rod 9 is screwed, and by a washer 15, the lies between this nut 14 and the first pipe end.

In the second end region 110 there is a spring 12, for example a helical compression spring, arranged which the second end of the rod 9 in the direction away from the second end of the Tube 8 prestressed.

Due to this bias, the stop 13 is always pressed against the first pipe end and thus rod 9 and tube 8 are held immovably in relation to one another in the first end region 100.

If such a temperature sensor 7 is heated, its rod 9 expands more than its tube 8. The second end of the bar can thus - as in Fig. 3 with the arrow labeled T + indicated - move away from the second pipe end.

The resulting relative movement between the second rod and the second Pipe end (shown in the drawings as a change in length of the rod 9 <L, the Changing the length of the tube 8 is practical because of its ceramic design negligible) can be a directly proportional measure of the temperature of the sensor 7 and thus be evaluated for the temperature of the sensor environment. This evaluation can basically take place in any form, the most common and shown in the drawings Variant lies in the second pipe end, for example, via a plunger 16 on one of the For the sake of clarity, only schematically represented switch contact 17 can act.

This switching contact 17 can be connected in series to a heating resistor by means of which the environment of the temperature sensor 7, such as in particular that shown in Fig.1,2 Hob, is heated. In this way there is a limitation or regulation of the generated temperature possible.

Switch contact 17 and plunger 16 are mounted in the switch head 18, which also second end of the tube 8 is attached. This ensures that the second pipe end and

Switch contact 17 are held immovable to each other and the actuation of the discussed Switching contact 17 possible by the second rod end movably mounted in the switching head 18 is.

The embodiment of Figure 4 is based on the same basic functional principle, it points here however, the tube 8 has a higher coefficient of thermal expansion than the rod 9. Im The first end region 100 is the tube 8 with, for example, formed from metal and with the pipe 8 welded plug 14 'closed, on which the end face of the rod 9th is applied. The second end of the tube 8 is again fixed to the switch head 18, the second End of the rod 9 is movably mounted in the switch head 18 and is spring 12 into the Tube 8 pressed into it.

When the temperature rises, the tube 8 expands, which means the second end of the rod 9 is moved in the direction of tube 8 (see arrow T +). This relative movement can also be in evaluated in any way, for example for actuating a switching contact 17 be exploited.

As can be seen from FIGS. 5 to 8, two switching contacts 17 can be found in the switching head 18 and 19, which can be actuated by the plunger 16. The first one Temperature sensor 7 closer switch contact 17 (main heat contact) serves in the Rule for interrupting the energy supply to the radiator of the hotplate, if this one impermissibly high temperature reached. When designing the radiator as electrical Heating coil, the switching contact 17 is connected in series with this.

The second switching contact 19 is usually used for so-called hot indication, i.e. for signaling, that a hotplate has a temperature that is too high for safe touching. He controls a signaling device with which the excessively high temperature is is displayed in any way, for example optically or acoustically. optical Signaling devices, e.g. Lamps can be distributed below the cooking surface be arranged so that it can be made clear which areas of the cooking surface which can be touched safely and which cannot.

From these functions of the switch contacts 17 and 19 it follows that the second switch contact 19 must be operated at a (significantly) lower temperature than the first Switch contact 17.

The present invention relates to design measures, which a Allow adjustment of the switching temperature of the second switching contact 19.

In the accompanying drawings, the switch contacts 17, 19 each include fixed ones Contact pieces 24, 25, with the connecting lugs projecting through the switch head housing 26, 27 are connected. These fixed contact pieces 24, 25 act with movable contact pieces 28,29 together, which are held on contact springs 30,31. These contact springs are 30.31 in turn attached to contact carriers 32, 33, which are connected to connecting lugs 26 ', 27'.

The contact springs 30, 31 have punched-out tabs 30 ', 31' which are connected to the Contact carriers 32,33 and the contact springs 30,31 connected supports 34,35 are supported. The contact springs 30, 31 become by means of these punched-out tabs 30 ', 31' in the positions shown in Figure 5 (contact 17 is closed and contact 19 is open) biased.

The supports 34, 35 as well as the contact springs 30, 31 have openings which are penetrated by the plunger 16.

The plunger 16 is formed with a head 36. With the first end face of this head 36 the plunger 16 abuts the rod 9. The second end face of this head 36 forms a shoulder 160, via which the plunger 16 acts on the first contact 17 in such a way that at temperature-related displacements of the plunger 16, this shoulder 160 to the transverse rib 37 the first contact spring 30 is applied and subsequently moved.

The second switch contact 19 could be actuated by the plunger 16 in a similar manner the first switching contact 17, namely by the foot-side end section 161, more specifically: the foot-side end face 162 of the plunger 16 presses on the switching spring 31.

In contrast, the present invention provides, however, the foot-side End section 161 not directly, but by means of a switching sleeve 20 on the switching spring 31 - and thus to act on the switching contact 19-. This switching sleeve 20 is on the placed on the foot-side end section 161 and slidably mounted opposite it. in the In the simplest case, this is achieved in that the inner diameter of the switching sleeve 20 slightly larger than the outer diameter of the foot-side end section 161 of the plunger 16 is selected.

To actuate the switching spring 31 by means of this switching sleeve 20, it can be provided that this switching sleeve 20 with its first end 200 (see FIG. 6) or with one their outer jacket, for example annular, approach 201 (see FIG. 5) on the Switch spring 31 comes to rest.

By moving the switching sleeve 20 relative to the plunger 16, the distance between the part of the switching sleeve 20 provided for actuating the switching spring 31 (end face End 200 or approach 201) and the switching spring 31 are changed, whereby the temperature, at which the second switching contact 19 is actuated, can be selected.

To set the operating temperature of the second switching contact 19, the Switch sleeve 20 in the distance corresponding to the desired actuation temperature brought the switching spring 31 and in this position with the foot-side end portion 161 a fusion welded joint or a soldered joint.

To enable a welded connection or a soldered connection to be made the foot-side end section 161 of the plunger 16 is designed to be weldable or solderable. This can in various ways, for example by means of an end section 161 on the foot side applied metal layer can be realized. This metal layer can be applied basically any method can be used, it would be conceivable, for example, that Produce metal layer by a sputter process.

The melt generated during the welding process by partially heating the switching sleeve 20 connects to this metal layer and thus to the plunger 16. It would be possible for the Not to metallize the surface of the plunger 16, which is normally formed from ceramic, but only to roughen so far that the melt in the surface unevenness can penetrate and thereby adhere sufficiently to the plunger surface.

Various welding processes can be used to generate the melt, e.g. Resistance friction welding can be used. Switching sleeve 20 is particularly preferred however, connected to the plunger 16 by means of laser welding.

If the switching sleeve 20 is to be fixed by a soldering process on the plunger 16, then is on a metal layer on the foot-side end section 161 and a solder layer thereon applied.

For heating the switching sleeve 20 or the metal layer to above the melting temperature The temperature of the solder can, in principle, again be used for any method come, but a laser beam is also preferably used for this purpose.

Another possibility, which is discussed in more detail below, is the foot-side end section 161 to make the plunger 16 weldable or solderable is a metallic on it Put on receiving sleeve 22.

A disadvantage of the embodiment of FIG. 6 discussed so far is that the exact Positioning of the switching sleeve 20 in both directions, i.e. both on the foot side End face 162 of the plunger 16 to and away from this end face 162, by gripping the shift sleeve 20 and applying a corresponding tensile or compressive force must become. In order to grasp and apply tensile or compressive forces can facilitate a grip aid on the switching sleeve 20, e.g. a registered in Fig.5 Pin 41 to be fixed.

It can be provided that an internal thread is cut into the switching sleeve 20 which the pin 41 screwed and after completion of the necessary for adjustment Switching sleeve displacements are screwed out and removed.

Another way of training the grip aid is to introduce a or several indentations in the outer surface of the switching sleeve 20 or roughening this outer surface. The between the switching sleeve 20 and the displacement of the Switching sleeve used gripping tool resulting friction forces are increased, with which a slipping of the gripping tool from the switching sleeve 20 during the displacement movements is avoided.

In the embodiments shown in FIGS. 5 and 7, a spring 21 is provided, which the switching sleeve 20 in the direction away from the foot end face 162 of the plunger 16th biases. The construction and arrangement of this spring 21 can in principle can be chosen arbitrarily, but has proven to be cheap, a helical compression spring to use. Such could, as shown in Fig.7, between the foot side End face 162 of the plunger 16 and the front, closed end 200 of the Switching sleeve 20 may be arranged. Another possibility shown in FIG. 5 is to the helical compression spring 21 at one end on the neck 201 of the switching sleeve 20 and at the other end on an extension 23 which connects to a receiving sleeve 22 which will be explained in more detail below is molded to let it rest.

For exact positioning of the switching sleeve 20 for the purpose of adjusting the switching temperature of the second contact 19 thus only needs the first end 200 of the switching sleeve 20 - for example via an incorporated in the side wall of the switch head 18 Opening 39- be accessible. To shift the switching sleeve 20 in the direction of corresponding end face 162 is exerted corresponding pressure on the switching sleeve 20 for Shifting the switching sleeve 20 in the opposite direction becomes this pressure reduced, with which the spring 21 can push back the switching sleeve 20.

In the particularly preferred embodiment shown in FIG Receiving sleeve 22 is provided, which is placed on this end section 161 and with this connected is. This connection can be so tight that no relative movements between plunger 16 and receiving sleeve 22 are possible. The connection could be through an interference fit between the front end portion 161 and the receiving sleeve 22 can be achieved. It is also conceivable to close the receiving sleeve 22 with the plunger 16 glue, weld or solder. To produce a welding or Solder connection of the plunger 16 can be designed to be weldable or solderable, which is the same as above discussed - can be done by metallizing the foot-side plunger section 161.

However, it is also sufficient here to design this connection in such a way that the plunger 16 the receiving sleeve 22 can take with it when the temperature rises, as shown in FIG the end wall 220, against which the foot-side end face 162 of the plunger 16 bears, is achieved.

The outer casing of the receiving sleeve 22 is at a distance from the second end 202 the switching sleeve 20 has a shoulder 23, preferably in one piece with the receiving sleeve 22 trained. The spring 21 is again designed as a helical compression spring and in Distance between shoulder 23 and second end 202 located.

The adjustment of the switching temperature of the second switching contact 19 proceeds here as follows: The Receiving sleeve 22 is pressed against the plunger 16 and thus against the rod 9. Now the switching sleeve 20 in the direction of the first contact 17 against the force of the spring 21 shifted until the second contact 19 opens. From this switching point the Switching sleeve 20 further shifted in the direction of the first contact 17 by one such a path, which is the difference between the desired switching temperature and the corresponds to the current room temperature. (The length of this path can be -da die Thermal expansion coefficient of the two expansion elements 8.9 and their lengths are known, calculate.)

When the desired differential path is reached, the switching sleeve 20 is fixed with the Receiving sleeve 22 connected, which is preferably by laser welding (two to four Spot welds 40) is reached.

The switching sleeve 20 is thus also here with the foot-side end section 161 of the plunger 16 connectable or after manufacturing the laser welding spots- actually connected. This Although the connection is not direct, it is mediated by the receiving sleeve 22.

In order to enable the welding of the switching sleeve 20 and the receiving sleeve 22, Receiving sleeve 22 and switching sleeve 20 made of materials, preferably of metals, which have similar melting points.

Analogously to FIG. 6, even if a receiving sleeve 22 is provided, it could be without one Spring 21 can be used, but with the difficulty already discussed above would be connected that for shifting the switching sleeve 20 also in the direction away from the a force on the foot-side end face 162 is applied to the switching sleeve 20 from the outside got to. The application of such a (tractive) force could already be provided from above explained gripping aids are facilitated.

In Figure 8 is the application of the present invention to a temperature limiter shown, the temperature sensor 7 constructed according to the construction principle of Figure 4 is, that is, a tube 8 made of a material with a high coefficient of thermal expansion and a rod 9 therein made of a material with low Has coefficient of thermal expansion.

The plunger 16 is not different from the temperature increases here than in Fig.5-7 Temperature sensor 7 away, but moved to the temperature sensor 7, so in the other direction moves. In order to still open the first when the temperature rises To effect contact 17 and a closing of the second contact 19 is with each contact 17, 19 the position of its fixed contact piece 24 or 25 with the position of its movable contact piece 28 or 29 interchanged.

In the second contact 19 of interest for the present invention, the movable contact Contact piece 29 from the switching spring 31 in the direction of closed, i.e. on firm Contact piece 25 adjacent, position biased. The switching spring 31 can be movable Contact piece 29 actually pivot into this closed position when the with the foot-side end section 161 connected and acting on the switching spring 31 switching sleeve 20 releases the switching spring 31.

The adjustment of the temperature at which this release takes place (= switching temperature of the second contact 19) is carried out as follows:

The receiving sleeve 22 is pressed against the plunger 16 and thus against the rod 9. Now the switching sleeve 20 in the direction of the first contact 17 against the force of the spring 21 shifted until the second contact 19 closes.

Now the force exerted on the switching sleeve 20 must be reduced so far that the spring 21 the switching sleeve 20 back, i.e. can move away from the first contact 17. You leave them First, move the switching sleeve 20 back until the second contact 19 opens Has. From this opening point, the switching sleeve 20 is allowed to continue, namely around one Move back, which is the difference between the desired switching temperature and corresponds to the current room temperature. (The length of this path can be -da die Thermal expansion coefficient of the two expansion elements 8.9 and their lengths are known, calculate.)

When the desired differential path is reached, the switching sleeve 20 is through Laser welding (two to four welding spots 40) is permanently connected to the receiving sleeve 22. Even if the temperature sensor is designed in accordance with that shown in FIG In terms of construction, analogous to FIGS. 6, 7, one can do without a receiving sleeve 22 be by the surface of the plunger 16 in the region of its foot end portion 161 is made weldable or solderable by other measures, for example by Metallization or roughening of this end section 161.

Furthermore, the provision of a spring 21 is not mandatory, it must be omitted Switching sleeve 20 again in both directions, i.e. both on the foot side End face 162 to as well as moved away from this by external forces become. Again, to facilitate the application of the appropriate train and Pressure forces grip aids to be set on the switching sleeve 20.

As explained in connection with Figure 4, it must be in this embodiment of the Give temperature sensor 7 a spring 12 which presses the rod 9 against the plug 14 '.

In the embodiment shown in FIG. 8, this function is performed by the switching spring 30 of the first switching contact 17, but it could deviate from this, but also a separate spring be provided.

The invention was made because this is a preferred and mostly used in practice Embodiment is shown with the aid of a temperature limiter in the switch head 18 two switching contacts 17, 19 are arranged. However, the invention is not based on the application with such a temperature limiter, it can also be used if only one switching contact 19 is provided, which is connected to the foot end 161 of the Ram 16 is operated.

In the attached claims it is defined that the switching sleeve 20 with the foot-side end section 161 of the plunger 16 is “connectable”. This is supposed to Be expressed that both the scope of the claims Temperature limiter is included, at which the switching temperature of the switching contact 19th not yet adjusted and so that the switching sleeve 20 is not yet connected to the plunger 16, as well as a temperature limiter at which this adjustment has already been carried out and so that the connection between the switching sleeve 20 and the plunger 16 already exists.

If this connection has already been made, there is a shifting of the switching sleeve 20 compared to the plunger 16 no longer possible, but this does not change the fact that the Switching sleeve 20 is still slidably mounted with respect to the plunger 16, this Slidable storage can no longer be used to actually shift the switching sleeve 20 can be used. In this respect the features contradict "displaceable compared to that foot-side end section 161 "and" with the foot-side end section 161 not connected "to each other.

The need to define the scope of the claims so that they both comprises a temperature limiter, in which the switching sleeve 20 already with the plunger 16th is connected as well as a temperature limiter, in which switching sleeve 20 and plunger 16 are not yet connected, due to the fact that the Temperature limiter according to the invention brought into the market in two different states can be:

On the one hand there is the possibility that the adjustment in question has already been made by the manufacturer of the temperature limiter according to the invention is carried out, with which Temperature limiter at which the switching sleeve 20 is already connected to the plunger 16 is on the market.

On the other hand, it would also be conceivable that the adjustment in question is not the manufacturer of the temperature limiter, but the producer of the heating, for the monitoring of which Temperature limiter is used. The temperature limiter manufacturer delivers the temperature limiter in the unadjusted state, in which the switching sleeve 20 still is not connected to the plunger 16.

Claims (8)

Temperature limiter comprising a switching head (18) containing at least one switching contact (19) and a temperature sensor (7) which is formed from elongated expansion elements (8, 9) which have different coefficients of thermal expansion, the expansion elements (8, 9) in the first, End region (100) spaced from the switching head (18) is held immovably with respect to one another and in the second end region (110) lying near the switching head (18) is movably held with respect to one another, a plunger (16) also being slidably mounted in the switching head (18) and being movably opposite one another the switching head (18) is held by the expansion element (8, 9) and acts on the switching contact (19) via its foot-side end section (161), a switching sleeve (20) being placed on the foot-side end section (161) and being displaceably mounted opposite it , with which the switch contact (19) can be actuated, characterized in that the foot-side end section (1 61) of the plunger (16) is designed to be weldable or solderable and that the switching sleeve (20) can be connected or connected to the foot-side end section (161) via a fusion welded connection or a soldered connection. Temperature limiter according to claim 1, characterized in that the switching sleeve (20) can be connected or connected to the foot-side end section (161) via a laser welding or a laser soldering connection. Temperature limiter according to claim 1 or 2, characterized in that a grip aid, for example in the form of a pin (41) or in the form of indentations or roughening worked into the outer surface, is fixed or can be fixed on the switching sleeve (20). Temperature limiter according to claim 1, 2 or 3, characterized by a spring (21), preferably designed as a helical compression spring, which prestresses the switching sleeve (20) in the direction away from the end face (162) of the plunger (16) on the foot side. Temperature limiter according to one of claims 1 to 4, characterized by a metal layer applied to the end section (161) on the foot side. Temperature limiter according to claim 5, characterized by a solder layer applied to the metal layer. Temperature limiter according to one of claims 1 to 6, characterized by a receiving sleeve (22) placed on the foot-side end section (161) and connected to it, onto which the switching sleeve (20) is placed. Temperature limiter according to claim 7, characterized in that the receiving sleeve (22) has a preferably annular extension (23) arranged at a distance from the front end (200) of the switching sleeve (20) and in that the spring (21) is designed as a helical compression spring which is arranged at a distance between this extension (23) and the front end (200) of the switching sleeve (20).

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