EP2503581B1 - Temperature-dependent circuit with power transmission element - Google Patents

Description

The present invention relates to a temperature-dependent switch with a temperature-dependent switching mechanism with a round snap-action disc, a housing receiving the switching mechanism, which has a lower part and a top, two provided on the upper part on the inside stationary contacts, each of which is connected to an associated external connection is, as well as arranged on the snap disk and moved by this current transmission member, wherein the snap disc is supported with its edge on a support surface in the switch to press the current transfer member temperature-dependent with the two stationary contacts in plant and / or stand out from them.

Such a switch is from the DE 26 44 411 C2 known.

The known switch has a housing with a cup-shaped lower part, in which a temperature-dependent switching mechanism is inserted. The lower part is closed by an upper part, which is held by the raised edge of the lower part of this. The lower part can be made of metal or insulating material, while the upper part here in any case consists of insulating material.

In the top sit two rivets whose inner heads serve as stationary contacts for the rear derailleur. The rear derailleur carries a current transfer member in the form of a contact bridge, on top of which a silver support is provided which has two interconnected mating contacts, which are brought into contact with the two stationary contacts depending on the temperature and then electrically connect them together.

The outer heads of the two rivets serve as external connections.

The temperature-dependent switching mechanism has a circular in plan view bimetallic snap disk and a circular in plan view spring snap-action disc, which are centrally penetrated by a pin which carries the contact bridge. The spring snap-action disc is circumferentially guided in the housing, while the bimetallic snap disk is supported depending on the temperature at a support surface formed by the shoulder of the lower part or the edge of the spring snap disk and thereby allows either the contact bridge to abut the two stationary contacts or the contact bridge lifts off from the stationary contacts, so that the electrical connection between the external connections is interrupted.

This temperature-dependent switch is used in a known manner to protect electrical equipment from overheating. This will be the switch electrically connected in series with the device to be protected and mechanically arranged on the device so that it is in thermal communication with this.

Below the response temperature of the bimetallic snap disk, the contact bridge is applied to the two stationary contacts, so that the circuit is closed and the device to be protected is supplied with power via the switch. If the temperature rises above a permissible value, the bimetallic snap-action disc lifts the contact bridge away from the stationary contacts, thus opening the switch and interrupting the supply of the device to be protected.

The now de-energized device can then cool down again. In this case, the thermally coupled to the device switch cools down again, which then automatically closes again.

By dimensioning the contact bridge of the known switch is able, compared to other temperature-dependent switches in which the operating current of the device to be protected flows directly through the bimetallic snap disk or its associated spring snap-action, so much higher operating currents to lead that it can be used to protect larger electrical appliances with high power consumption.

As already mentioned, the known switch automatically switches on again after cooling the device protected by it. While such a switching behavior for protecting a hair dryer, for example, can be quite useful, this is not desirable anywhere where the device to be protected after switching off may not automatically turn on again to avoid damage. This applies, for example, for electric motors that are used as drive units.

The DE 198 27 113 proposes therefore to provide a so-called self-holding resistor, which is electrically parallel to the external terminals. The self-holding resistor is in the open switch electrically in series with the device to be protected, through which only a harmless residual current now flows because of the resistance value of the self-holding resistor. However, this residual current is sufficient to heat the self-holding resistor so far that it emits a heat that holds the bimetallic snap disk above its switching temperature.

The from the DE 198 27 113 Known switch may also be equipped with a current-dependent switching function, to which a further resistor is provided, which is permanently connected in series with the external terminals. The operating current of the device to be protected thus flows constantly through this heating resistor, which can be dimensioned so that it ensures that when exceeding a certain operating current that the bimetallic snap disk is heated to a temperature above its response temperature, so that the switch at an increased Operating current already opens before the device to be protected has warmed up inadmissible.

Although the known switch has proven itself technically, its life is limited because of the switched high currents. Namely, the higher the number of switching operations becomes, the larger the contact resistance between the stationary contacts and the current transmitting member becomes. The increasing contact resistance limits the possible duration of use.

Based on this prior art, it is an object of the present invention, the aforementioned switch with little design effort in such a way that its life is extended.

According to the invention, this object is achieved in the switch mentioned above in that at the edge of the snap-action disc and / or on the Support surface for the edge at least one unevenness is provided, such that the snap disc rotates at each switching about its vertical axis.

The object underlying the invention is completely solved in this way.

The "unevenness" is thus provided in the context of the present invention either on the edge of the snap disk itself and alternatively or additionally also on a support surface for the edge. This support surface may be a shoulder on which the snap disk is supported when opening and / or closing the switch.

In the context of the present invention, a "unevenness" is understood to mean a deviation of the end face of the edge and / or the relevant contact surface from the uniformity in the form of a plane plane planned so far in the prior art, which means that the edge is no longer in the circumferential direction evenly rests on a shoulder or annular surface in the lower part, since the support contact is curved so to speak, so that, for example, an inclined, ascending or descending support surface is formed on or for the edge of the snap disk.

The unevenness may be a projection or a depression in the edge of the snap-action disk or on a bearing surface for the edge. The unevenness may extend over a circumferential range of more than 180 ° to nearly 360 °. Then it is a screw-like edge or a helical bearing surface for the edge, so that sets a twisting effect for the snap disc, which also always runs in the same direction.

If several bumps are provided, they can each extend in the circumferential direction by 45 ° to 90 °.

Namely, the inventor of the present application has recognized that such unevenness causes the snap-action disc and thus also the current-transmitting member to rotate with each switching operation, namely slightly, ie only by a few degrees. This slight rotation when opening and / or closing the switch causes not always exactly the same place on the power transmission member comes into contact with the mating contacts when the new switch closes after an opening operation again.

In other words, the contact surface available on the current transfer element is better utilized, so that the proportion of the contact resistance caused by the current transfer element is distributed over many different contact points, and it takes a correspondingly longer time until the contact resistance as a whole reaches an impermissible value.

According to the inventor of the present application, the effect of the rotating snap disk primarily results in that the proportion of the contact resistance on the current transmission member increases more slowly. This does not apply to the same extent to the contribution of the stationary contacts to the contact resistance. However, the rotation of the current transmitting member also causes the proportion of the contact resistance attributable to the stationary contacts to increase more slowly with the switching operations than in the prior art.

All this means that in a structurally simple manner, the life of the known switch is increased, for which only a corresponding design of the edge of the snap-action disc or its bearing surface is required. Otherwise, the proven design variants of the known temperature-dependent switch for high currents can be maintained.

Contrary to expectations, this does not evenly on the designated shoulder resting snap disc does not cause the contact pressure is reduced or even the switching behavior itself is adversely affected.

If the at least one unevenness is provided on a bearing surface for the edge of the snap-action disc, the snap-action discs themselves do not have to be changed constructively so that available snap-action discs can be used in order to achieve the turning effect according to the invention. Here it is advantageous that the thermal and mechanical properties of the snap discs do not need to be redesigned.

If, in addition, unevennesses are provided on the snap-action disc, they can interact with the unevennesses on the support surface in such a way that the snap-action disc rotates slightly each time it is switched. These bumps can interact like gears, as they are found, for example, in ball press, where they cause a rotation of the switching mechanism with each pressing movement to extend the write mine at the first press and retract the second press.

The snap-action disc can be a bimetallic snap-action disc which ensures the closing pressure and the temperature-dependent opening movement. The closing pressure can also be applied alone or in addition by a Federschnappscheibe, while a bimetallic snap disk is provided, which either provides only for the opening movement or contributes to the contact pressure in its low temperature position.

Accordingly, either only the edge of bimetal or spring snap-action disc or the edges of both snap discs are provided according to the invention with at least one unevenness. In addition, unevenness may be provided on support surfaces in the sense described above.

However, it is sufficient for the turning effect according to the invention if at least one unevenness is provided only on or for the edge of the bimetallic snap disk. When opening the switch, the bimetallic snap disk comes namely with its edge into contact with a support surface in the Switch, which leads due to the unevenness to a rotation of the bimetallic snap disk relative to the housing. It does not matter whether the bimetallic snap disk also contributes to the contact pressure in the closed position of the switch, or whether this is effected solely by the Federschnappscheibe.

Therefore, it is preferred that the snap-action disc is a bimetallic snap-action disc which is mechanically connected to the current-transmitting member and presses it below its switching temperature against the stationary contacts and lifts them above their switching temperature.

On the other hand, it is preferred if the snap-action disc is a spring snap-action disc which biases the current transfer member in the manner of abutment with the stationary contacts, and further comprises a bimetal snap-action disc which lifts the current transfer member above its switching temperature from the stationary contacts, further Preferably, the spring snap-action disc between the current transfer member and bimetallic snap disk is arranged.

While it is quite sufficient, if only a bimetallic snap disk is provided which produces both the contact pressure and provides for the temperature-dependent opening, can by a spring-snap disk, which in addition to the bimetallic snap disk or alone causes the contact pressure, the bimetallic Snap disk are relieved of mechanical stress in their low temperature position, which contributes to greater long-term stability of their switching behavior.

Further, it is preferred if the current transmission member is an approximately round contact plate, which is provided on its surface facing the stationary contacts with a circumferentially closed contact surface.

The contact plate is preferably connected by a pin-like rivet centric with the bimetallic snap disk and possibly the spring snap-action disc.

If an approximately round contact plate is used, this allows, on the one hand, in a particularly simple manner, the contact surface closed in the circumferential direction, with which the stationary mating contacts come into contact with each rotation of the contact plate at different regions.

Furthermore, the contact plate can turn particularly easily when it is connected via a rivet centric with the snap discs.

In general, it is preferred if the upper part is penetrated by two rivets whose inner heads serve as stationary contacts and their outer heads as external connections.

These features lead to the proven construction of a temperature-dependent switch, as shown in the documents mentioned above DE 26 44 411 C2 and DE 198 27 113 C2 is known.

Alternatively, it is preferred if two terminal electrodes are encapsulated with the upper part, each of which is connected to one of the stationary contacts and one of the outer terminals, wherein preferably each terminal electrode is a flat metal part with which the respective outer terminal, preferably laterally from the upper part protrudes, is integrally formed, more preferably, the terminal electrodes are parallel to each other in the upper part.

These features lead to the well-proven design of a temperature-dependent switch, as shown in the documents DE 197 08 436 C2 and DE 197 27 197 C2 is known.

A particular advantage lies in the production of the new switch, because the terminal electrodes can be connected in a first step with stationary contacts and the external terminals, whereupon at Spraying of the upper part of the terminal electrodes are cast or molded so to speak.

It is also advantageous that the "outside the switch" external connections are good weiterzuverbinden, so that simplifies the installation of the new switch to a protected device.

Further advantages will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Fig. 1

einen schematischen, nicht maßstabsgetreuen Längsschnitt durch den neuen Schalter;

Fig. 2

in einer Darstellung wie in Fig. 1 ein weiteres Ausführungsbeispiel des neuen Schalters;

Fig. 3

geschnitten und in schematischer Seitenansicht sowie in Draufsicht von unten eine bei den Schaltern aus Fig. 1 oder 2 verwendete Schnappscheibe;

Fig. 4

eine schematische Draufsicht auf den bei den Schaltern aus Fig. 1 oder 2 verwendeten Kontaktteller;

Fig. 5

in schematischer Seitenansicht eine Abwicklung von Schnappscheibe und Auflageschulter, mit einer sich über nahezu 360° erstreckenden, allmählich aufsteigenden Unebenheit;

Fig. 6

eine Darstellung wie Fig. 5, jedoch mit einer Vielzahl von Unebenheiten sowohl an der Schnappscheibe als auch an der Auflageschulter; und

Fig. 7

eine Darstellung wie Fig. 5, jedoch mit einer sich über nahezu 360° erstreckenden, allmählich abfallenden Unebenheit.

Embodiments of the invention are illustrated in the accompanying drawings and are explained in more detail in the following description. Show it:

Fig. 1

a schematic, not to scale longitudinal section through the new switch;

Fig. 2

in a representation like in Fig. 1 another embodiment of the new switch;

Fig. 3

cut and in a schematic side view and in plan view from below one at the switches off Fig. 1 or 2 used snap-action disc;

Fig. 4

a schematic plan view of the at the switches off Fig. 1 or 2 used contact plates;

Fig. 5

a schematic side view of a development of snap disc and support shoulder, with a nearly 360 ° extending, gradually rising unevenness;

Fig. 6

a representation like Fig. 5 but with a variety of bumps on both the snap-action disc and the support shoulder; and

Fig. 7

a representation like Fig. 5 but with a gradually sloping unevenness extending over nearly 360 °.

In Fig. 1 is denoted by a temperature-dependent switch 10, which includes a temperature-dependent switching mechanism 11 which is housed in a housing 12.

The housing 12 comprises a lower part 14 and a closing this upper part 15 which is held by a flanged edge 16 of the lower part 14 at this. Between the lower part 14 and the upper part 15, a ring 17 is arranged, which is supported on a shoulder 18 of the lower part 14 and there leads a spring snap-action disc 21 of the rear derailleur 11 at its edge 19.

The rear derailleur 11 additionally comprises, in addition to the spring snap-action disc 21, a bimetal snap-action disc 22 which, together with the spring snap disc 21, is centrally penetrated by a pin-like rivet 23 by which these are mechanically connected to a current transfer member in the form of a contact plate 24. The rivet 23 has a first shoulder 25 on which the bimetal snap disc 22 is seated with radial and axial play, with a second shoulder 26 is provided on which the spring snap disc 21 also sits with radial and axial play.

The bimetal snap-action disc 22 is supported with its peripheral edge 27 on a shoulder 28 running inside in the lower part 14, which forms an annular bearing surface for the edge 27.

The already mentioned contact plate 24 has in the direction of the upper part 15 a radially encircling contact surface 29 which cooperates with stationary contacts 31, 32 which are inner heads of rivets 33, 34 which pass through the upper part 15 and with their outer heads external connections 35, 36 form.

In the in Fig. 1 shown switching position press spring-snap disc 21 and bimetallic snap disk 22 the contact plate 24 against the stationary contacts 31 and 32, which are thus connected to each other via the contact surface 29; the switch 10 is closed.

If the temperature of the bimetal snap-action disc 22 increases beyond its response temperature, it snaps from the convex into a concave shape and supports itself with its edge 27 in the region of the ring 17 and pulls the contact plate 24 against the force of the spring Snapping disk 21 away from the stationary contacts 31, 32; the switch 10 is now open.

The switch described so far is from the DE 26 44 411 C2 and the DE 198 27 113 C2 known. If the temperature lowers now, would the from the DE 26 44 411 C2 well-known switch again in the in Fig. 1 snapped back, closed state shown.

Like the one from the DE 198 27 113 C2 However, known switch, the upper part 15 on its inner side 37 on a self-holding resistor 38 which is electrically connected between the stationary contacts 31, 32. For further details of the structure and the arrangement of the self-holding resistor 38 is on the DE 198 27 113 C2 directed.

In an alternative embodiment, as in Fig. 2 is shown, a temperature-dependent switch 40 has a housing 41, in which the switching mechanism 11 from Fig. 1 is installed.

The housing 41 here comprises a plate-like lower part 42, on the raised edge 43, an outer, circumferential groove 44 is provided. On the raised edge 43, a cup-like upper part 45 is supported with an inner shoulder 46. Over the shoulder 46 projects an edge 47, on which an inner circumferential bead 48 is provided, which is in engagement with the groove 44, whereby the lower part 42 is locked to the upper part 45.

The edge 47 merges into an annular overlap 49, through which the lower part 42 is further held on the upper part 45. This overlap 49 can be generated by embossing or welding a protruding portion of the rim 47.

While the upper part 45 is made of insulating material, the lower part 42 may also be made of insulating material or of metal, with a lower part made of metal results in a better thermal connection of the switch 40 to a device to be protected.

In the upper part 45 two adjacent connection electrodes 51, 52 are cast, each carrying a welded stationary contact 53, 54. The two stationary contacts 53, 54 are arranged on an inner side 55 of the upper part 45. The two terminal electrodes 51, 52 are formed as flat metal parts and formed integrally with external terminals 56, 57, which protrude laterally from the upper part 45.

The two stationary contacts 53, 54 are temperature-dependent connected by the contact plate 24 with each other as in connection with Fig. 1 already described.

The bimetallic disc 22 is also supported here with its edge 27 in the switching position shown on the shoulder 28 of the lower part 42. Furthermore, it can be seen better than in FIG. 12 that the spring snap-action disc 21 is peripherally guided with its edge 19 in a circumferential groove 59 which is formed between the shoulder 46 and the edge 43.

In Fig. 3 is shown in a sectional, schematic side view of the bimetallic snap disk 22, as in the derailleurs 11 from the Fig. 1 and 2 is used.

The bimetallic snap disk 22 is in a conventional manner, a slightly dome-shaped, circular in plan view disc, the edge 27 usually has a completely flat, annular end face.

The bimetallic snap disk 22 has, for example, a diameter 60 of about 8 mm, wherein its indicated at 61 height between the edge 27 and its dome-shaped elevation 62 is about 0.8 mm.

At 63 and 64 are indicated at the edge 27, two small bumps, which cause the bimetallic snap disk 22 rotates by an angular amount about its axis indicated at 65 in Hochachse when between the in Fig. 3 drawn low-temperature position and its high-temperature position umspringt in Fig. 3 indicated by dashed lines.

In its low-temperature position, the bimetallic snap disk 22 is supported on the shoulder 28, while it is supported in its high temperature position on a support surface 66 which may correspond to the edge 19 of the spring snap-action disc 21. If no spring snap disc 21 is provided, the bimetallic snap disk 22 is supported with its edge 27 accordingly on a shoulder 67 forming the bearing surface, which in the switch according to Fig. 1 downward pointing to the ring 17 and the switch according to Fig. 2 is provided in the groove 59.

The bumps 63 and 64 now cause the bimetallic snap disk 22 to rotate about its vertical axis 65 when alternately supported on the shoulder 28 and the support surface 66.

For this purpose, it is only necessary that the bimetallic snap disk 22 has at least one such unevenness 63, 64. The unevenness 63 is formed in the example shown by an over the otherwise plane ring plane 68 of the rim 27 excellent protrusion of 0.2 mm and the unevenness 64 by a corresponding recess of 0.2 mm.

The unevenness 63 extends for example over a circumferential angle range 69 of 50 ° and the unevenness 64 over a circumferential angle range 71 of 80 °, as shown in FIG Fig. 3 is shown below, where the bimetallic snap disk 22 is shown in bottom view.

In other words, the edge 27 is not flat but so "crooked" that it does not rest evenly and evenly on the shoulder 27 and the support surface 66.

In the same way, in addition or as an alternative, the spring-snap-action disc 21, which is also round in plan view and is preferably circular, may be formed at its edge 19 with corresponding unevennesses 63, 64.

However, for the turning effect according to the invention, it is sufficient if only the bimetallic snap disk 22 is provided at its edge 27 with at least one unevenness 63, 64, even if the bimetallic snap disk 22 in its in Fig. 1 shown low temperature position is not supported with its edge 27 on the shoulder 28, but is free of forces. When you open the switch, it gets namely, with its edge 27 in contact with the here forming the bearing surface shoulder 19 of the spring snap disk 21, which leads to a rotation of the bimetallic snap disk 22 relative to the housing 12 because of the unevenness 63, 64.

In Fig. 4 is still a plan view of the contact plate 24 from the rear derailleurs 11 in the Fig. 1 and 2 shown.

The contact plate 24 is rotationally symmetrical to the Fig. 3 shown vertical axis 65 of the bimetallic snap disk 22 is formed. Around the vertical axis 65 lies on the stationary contacts facing surface 72, the contact surface 29 which is circumferentially closed in itself and thus formed as an annular surface. The surface 72 is formed on its entire annular surface by suitable coating or treatment as an electrically conductive contact area, the two stationary contacts 31 and 32 of Fig. 1 or 53 and 54 off Fig. 2 electrically interconnects when in contact with the contact surface.

If the bimetal snap-action disc 22 and / or the spring snap-action disc 21 rotate about the vertical axis 65 during the switching operations, this is transmitted via the rivet 23 at least partially to the contact plate 24, so that this too in the switching operations to the Vertical axis 65 twisted. This leads to repeatedly different areas of the contact surface 29 with the stationary mating contacts 31, 32; 53, 54 come into contact.

In this way, a considerably higher number of switching operations is possible before the contact resistance between the stationary contacts 31, 32; 53, 54 and the contact surface 29 has increased so far that the switch 10, 40 reaches the end of its life.

In Fig. 5 is in a further embodiment example very schematically and in detail a development of the bimetallic snap disk 22 and the shoulder 28 of the lower part 14 shown over 360 °. The edge 27 of the bimetallic snap disk 22 is flat, while the shoulder 28 is provided with a projecting over its ring plane 73 unevenness 74 having a gradually increasing in the circumferential direction bearing surface 75. The unevenness 74 extends over a circumferential region 81 of 340 °, that is to say of nearly 360 °.

In Fig. 6 is in a presentation like Figure 5 in a further embodiment shown that both the edge 27 of the bimetallic snap disk 22 and the shoulder 28 with many, circumferentially distributed unevennesses 76, 77 is provided. The number of bumps 76 may correspond to the number of bumps 77, but this is not necessary and in many cases not desirable.

The unevenness may alternatively-like the unevenness 64-also be formed as a recessed unevenness 78, which has a contact surface 79 gradually sloping below the ring plane 73 in the circumferential direction. This embodiment is in Fig. 7 shown. Here, too, the unevenness extends over a circumferential region 81 of 340 °, ie a circumferential angle range of almost 360 °. Of course, the peripheral region 81 can also be selected smaller than 340 °, for example 180 ° or 270 °.

The bumps 74, 78 may just as well be formed on the edge 27 of the bimetallic snap disk 22, the shoulder 28 then having a completely plane ring plane 73.

In each switching operation cause the bumps 74, 76, 77, 78 as the bumps 63, 64, that the bimetallic snap disk 22 in the circumferential direction slightly opposite the shoulder 28 rotates. During this rotation, the contact plate is taken along, as already described above.

Claims (15)

1. Temperature-dependent switch comprising a temperature-dependent switching mechanism (11) with a round snap-action disc (21, 22), a housing (12; 41) that accommodates the switching mechanism (11) and comprises a lower part (14; 42) and an upper part (15; 45), two stationary contacts (31, 32; 53, 54) provided on an inner side (37; 55) of the upper part (15; 45), each of said stationary contacts being connected to an external connection (35, 36; 56, 57) assigned to the respective stationary contact, as well as a current transfer member (24) arranged on the snap-action disc (21, 22) and moved by said snap-action disc, wherein the snap-action disc (21, 22) is supported by its edge (27, 19) on a supporting surface (28, 66, 67, 73) in the switch (10, 40) in order to push the current transfer member (24) into contact with the two stationary contacts (31, 32; 53, 54) and/or to lift it off from the stationary contacts, in a temperature-dependent manner,
   characterized in that at least one irregularity (63, 64, 74, 76, 77, 78) is provided on the edge (19, 27) of the snap-action disc (21, 22) and/or on the supporting surface (28, 66, 67, 73) for the edge (19, 27) in such a way that the snap-action disc (21, 22) turns about its vertical axis (65) with every switching process.
2. Switch according to claim 1, characterized in that the snap-action disc (21, 22) is a bimetallic snap-action disc (22) which is connected mechanically to the current transfer member (24) and presses this against the stationary contacts (31, 32; 53, 54) when below its switching temperature, and lifts it off from them when above its switching temperature.
3. Switch according to claim 1 or 2, characterized in that the snap-action disc (21, 22) is a snap-action spring disc (21) which is preloaded to press the current transfer member (24) into contact with the stationary contacts (31, 32; 53, 54), and that furthermore a bimetallic snap-action disc (22) is provided which lifts the current transfer member (24) off from the stationary contacts (31, 32; 53, 54) when above its switching temperature.
4. Switch according to claim 3, characterized in that the snap-action spring disc (21) is arranged between the current transfer member (24) and the bimetallic snap-action disc (22).
5. Switch according to anyone of claims 1 to 4, characterized in that the current transfer member is an approximately round contact plate (24) which is provided with a contact surface (29), closed in the circumferential direction, on its surface (72) that faces the stationary contacts (31, 32; 53, 54).
6. Switch according to anyone of claims 1 to 5, characterized in that the upper part (15) is penetrated by two rivets (33, 34), the inner heads of which act as stationary contacts (31, 32), and whose outer heads act as external connections (35, 36).
7. Switch according to anyone of claims 1 to 5, characterized in that two connecting electrodes (51, 52) are cast with the upper part (45), each of which is connected to one of the stationary contacts (53, 54) and to one of the external connections (56, 57).
8. Switch according to claim 7, characterized in that each connecting electrode (51, 52) is a flat metal part, with which the associated external connection (56, 57), which preferably protrudes laterally from the upper part (45), is formed as one piece.
9. Switch according to anyone of claims 1 to 8, characterized in that the irregularity (63, 64, 74, 76, 77, 78) comprises a projection (63) formed on the edge (19, 27) of the snap-action disc (21, 22) which protrudes over the plane annular surface (68) of the edge (19, 27).
10. Switch according to anyone of claims 1 to 8, characterized in that the irregularity (63, 64, 74, 76, 77, 78) comprises a depression (64) formed on the edge (19, 27) of the snap-action disc (21, 22) which retreats from the plane annular surface (68) of the edge (27).
11. Switch according to anyone of claims 1 to 10, characterized in that the irregularity (63, 64, 74, 76, 77, 78) comprises a projection (74) formed on the supporting surface (28, 66, 67, 73) for the edge (19, 27) of the snap-action disc (21, 22) and protruding over the annular surface (73) of the supporting surface (28, 66, 67, 73).
12. Switch according to anyone of claims 1 to 11, characterized in that the irregularity (63, 64, 74, 76, 77, 78) comprises a depression (78) formed on the supporting surface (28, 66, 67, 73) for the edge (19, 27) of the snap-action disc (21, 22) and retreating from the annular surface (73) of the supporting surface (28, 66).
13. Switch according to anyone of claims 1 to 12, characterized in that the irregularity (63, 64) extends over a circumferential angular range (69, 71) of between 45° and 90°.
14. Switch according to anyone of claims 1 to 12, characterized in that the irregularity (74, 78) extends over a circumferential range (81) of more than 180°.
15. Switch according to claim 13, characterized in that the irregularity (74, 78) comprises a circumferentially rising or falling supporting surface (75, 79).

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