ES2637659T3 - Temperature dependent switch - Google Patents

Abstract

Temperature dependent switch with a first and second external connections (11, 12), with a stationary contact piece (15), which is conductively connected to the first external connection (11), with a piece of mobile contact (16) that collaborates with the stationary contact piece (15), which is fixed in a spring piece (16), which is conductively connected to the second external connection (12), and that presses the moving contact piece (16) against the stationary contact piece (15), with a bimetallic part (19) and with a pusher (21) disposed between the bimetallic part (19) and the spring part (17), in the that the bimetallic part (19), in the event that a switching temperature is exceeded, presses the pusher (21) against the spring part (17) and thus elevates the moving contact part (16) from the part of stationary contact (15), and with a piece of elastic lace resor te (33) which, at least in case the switching temperature is exceeded, presses the pusher (21) against the spring piece (17), characterized in that the pusher (21) has a rod (29), which it has at its first end (20b) a narrowed section (31), which has a widened head (28) in front of the narrowed section (31), in which the bimetallic part (19) is arranged on the narrowed section (31). and the spring elastic lace piece (33) with its respective bore hole (55, 56), such that the bimetallic piece (19) and the spring elastic lace piece (33) are kept in play between the head (28) and shank (29), so that the spring elastic snap piece (33) and the bimetallic piece (19) transmit pressure and tensile forces on the pusher (21).

Description

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

DESCRIPTION

Temperature dependent switch

The present invention relates to a temperature-dependent switch with a first and second external connections, with a stationary contact piece, which is conductively connected to the first external connection, with a mobile contact piece that collaborates with the stationary contact piece, which is fixed in a spring piece, which is conductively connected with the second external connection, and which presses the mobile contact piece against the stationary contact piece, with a bimetallic piece and with a pusher arranged between the bimetallic part and the spring part, in which the bimetallic part, in the event that a switching temperature is exceeded, presses the pusher against the spring part and thus raises the contact piece mobile from the stationary contact piece, and with an elastic spring fitting piece that, at least in the event that the switching temperature is exceeded Also, press the pusher against the spring piece.

A switch of this type is known from US 2013/0057381 A1.

A switch known from DE 10 2011 016 896 B3 is a temperature protective switch, in which, through the switching movement of a bimetallic disk, pressure forces are transmitted on a pusher on an elastic piece of current conduction , which acts here as a closing spring. The closing spring carries a mobile contact piece, which presses, when the switch is closed, against a stationary contact piece. The stationary contact piece and the closing spring are connected, respectively, with a connection plate. The two connection plates are fixed in an insulating body, from which they project laterally. The temperature protection switch has a flat housing, from which the two connection plates are projected as external connections.

Such temperature dependent switches are used in a known manner to protect electrical appliances from overheating. To this end, the switch is connected on its two external connections electrically in series with the apparatus to be protected and mechanically disposed in the apparatus such that it is in thermal connection with it.

In the embodiment of a switch according to DE 44 28 226 C1, a switch mechanism is provided in a housing formed by a spring elastic lace disk, bimetallic elastic lace disk and mobile contact piece which, in the state When the switch is closed, it is supported by its stationary contact part inside at the top, which contacts outwards with a first connection on the top. The conductive bottom serves as the second connection.

The operating current of the apparatus to be protected flows in this way through the two contact pieces and the spring elastic snap disk at the bottom.

The switch known from DE 44 28 226 C1 is provided with a heating resistor arranged electrically in series with the external connections, which deals with a temperature-dependent switching function. The operating current of the apparatus to be protected flows in this way constantly through this heating resistor, which can be sized in such a way that in the event that a certain operating current is exceeded, it ensures that the bimetallic elastic snap disk it is heated to a temperature above its reaction temperature, so that the switch, in the case of a high current, opens already before the device to be protected has been heated to an unacceptable extent.

Below the reaction temperature of the bimetallic elastic lace disk, the current circuit is closed and the device to be protected is supplied with current through the switch. If the temperature rises either as a result of an operating current that is too high or as a result of a device to be protected too hot above an allowable value, then the bimetallic elastic lace disk deforms, which makes the lace disk Spring elastic jumps from its first stable geometric configuration, in which the mobile contact piece presses against the stationary contact piece, to its second stable geometric configuration, in which it elevates the mobile contact piece from the stationary contact piece. The switch opens and the supply of the device to be protected is interrupted.

The device now without power can then be cooled again. In this case, the switch thermally coupled to the apparatus is also cooled again, which is then closed again automatically. While such switching behavior for protection may be convenient, in general, for example of a hair dryer, this is not desirable, in general, where the apparatus to be protected should not be automatically connected after disconnection, to avoid damage. . This applies, for example, to electric motors that are used as drive equipment.

Therefore, a call is often provided on known temperature dependent switches

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

self-retention resistor, which is electrically connected parallel to the connections, as described in the same way in DE 44 28 226 C1. The auto-retention resistor, when the switch is open, is electrically connected in series with the apparatus to be protected, through which, due to the value of the auto-retention resistor, only a non-detrimental residual current now flows. However, this residual current is sufficient to heat the self-retention resistance to the point that a heat radiates, which keeps the bimetallic elastic lace disk at a temperature above its switching temperature.

Unlike the embodiment of the switch according to DE 44 28 226 C1, the temperature-dependent switching mechanism may comprise only a bimetallic elastic fitting disc, which carries the moving contact piece and, therefore, conducts The operating current.

The switching mechanism may also comprise a bimetallic spring tongue, as described in DE 198 16 807 A1. This bimetallic spring tongue carries at its free end a piece of mobile contact, which collaborates with the opposite stationary contact. The opposite stationary contact is electrically connected to the first connection, so that the second connection is electrically connected to the recessed end of the bimetallic spring tongue. The bimetallic spring tongue in this case conducts the operating current of the electrical device to be protected.

When the temperature-dependent switch must conduct especially high currents, then a current transmission member is often used in the form of a contact bridge or contact plate, which moves through a spring piece and carries two pieces of contact, who collaborate with two opposite stationary contacts; see, for example, document DE 26 44 411 A1.

In this way, the operating current of the apparatus to be protected flows from the first opposite contact on the first contact piece to the contact plate, through it to the second contact piece and from this to the second opposite contact. The spring piece is this way without current. It is also known to use the actual spring part, that is, for example, a bimetallic elastic lace disk or a spring elastic lace disk that works against a bimetallic piece as contact, which conducts the operating current.

Known switches must be able to reliably protect motors both in the limit operation with maximum permissible power and also when the rotor is locked. To verify if the switch works correctly, two tests are normally performed.

In the so-called Warm-up Test, the motor is operated with maximum power, so that neither the current flow through the switch nor the heat transmitted in this case by the motor over the switch must open the switch.

In contrast, in the so-called Blocked Rotor Test, the motor is connected to the locked rotor with the operating voltage, which leads to an operating current flowing through the motor, which is three to five times greater than the usual operating current.

This high current naturally leads also to a heating of the motor and, therefore, to an increase in the temperature in the switch. To protect the motor against overheating, a good thermal coupling of the switch to the motor must be provided.

In addition to the good thermal coupling, the switch must meet the necessary number of switching cycles, which in the case of typical requirements, as described above, must be at least 3000.

In order for the switch to conduct high operating currents, without thereby warming the bimetallic disk at its switching temperature, DE 10 2011 016 896 B3, which forms the type, proposes to increase the distance between the closing duct current and the bimetallic disk through the pusher mechanically interleaved.

The bimetallic disk is also arranged in a cavity on an outer side of the insulating body to thermally decouple it, on the one hand, from the current conducting closing spring and, on the other hand, to enable a good thermal coupling of the bimetallic disk into the device to protect.

The temperature-dependent switching mechanism used in the known switch is constituted in principle as a so-called thermostat switch, which is used for the temperature regulation of an apparatus equipped with it, for example for the regulation of the temperature of a heating plate. For example, such thermostat switches are in the following protection rights: DE 31 36 312 A1, DE 196 37 706 A1, US 3,972,016 A, US 4,669,182 A, US 5,059,937 A and US 2004/0066269 A1.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

The switch known from DE 10 2011 016 896 B3 forming the type thus deviates from the usual structure of a temperature dependent switch according to DE 44 28 226 C1, although it is not designed as a thermostat, but as a temperature protection switch.

In the switch according to DE 10 2011 016 896 B3, in particular, it is an inconvenience that with high operating currents, it only exceeds a reduced number of switching cycles, that is, it fails early.

Tests at the applicant's premises have shown that the known switch is no longer opened with a current of 35 A flowing through the closing spring in the Locked Rotor Test with 120 VAC often and after 300 switching cycles , because the contact pieces have welded together through the arc formation.

US 3,931,603 A shows a temperature controller with bimetallic elastic disk, spring disk and contact bridge. Between the bimetallic elastic lace disk and the spring disk a bolt acts, which is fixed with one of its ends on the bimetallic elastic lace disk. On the other end of the bolt, the spring disk is seated, a state that is arranged between the spring disk and the bimetallic elastic lace disk on the bolt a contact bridge and between the contact bridge and the bimetallic elastic lace disk a spring of compression.

Below its switching temperature, the bimetallic elastic coupling disc presses the bolt in the direction of two opposite stationary contacts, on which the contact bridge is supported under the force of the compression spring, which is supported with the other end on the bimetallic elastic lace disc.

If the temperature of the bimetallic elastic lace disk is raised, then it removes the bolt from the two opposite stationary contacts, so that the bolt in this case raises the contact bridge from the opposite contacts, so that the switch is opened.

Document DE 26 25 102 A shows in the same way a temperature-dependent switch with bimetallic elastic lace disk, spring elastic lace disk and contact bridge, in which a pusher is connected at one of its ends with the Spring elastic lace disc and at its other end with the contact bridge, which collaborates with two opposite stationary contacts.

On the side of the spring elastic lace disk away from the pusher, a bimetallic elastic lace disk is arranged which, below its switching temperature, is disposed below the spring elastic lace disk, so that the switch is closed .

If the temperature of the bimetallic elastic lace disk rises, then it presses against the pusher and the spring elastic lace disk, so that the contact bridge rises from the opposite stationary contacts and the spring elastic lace disk jumps elastically from its first to its second mechanically stable position. In this open state, both the spring elastic lace disk and the bimetallic elastic lace disk press the contact bridge out of the opposite stationary contacts.

A switching pattern is provided above the contact bridge, which is arranged on a spring-loaded elastic snap disk on an activation head. When the activation head is pressed inside the switch housing, then the switching stamp presses, with the switch open, against the contact bridge. The adjusting force of the second spring elastic lace disk is less than the sum of the adjustment forces of the first spring elastic lace disk and the bimetallic elastic lace disk, so that when the activation head is pressed in in the housing, the second spring elastic snap disk elastically switches to its inactive position, when the bimetallic elastic snap disk is outside its switching temperature.

If the temperature of the bimetallic elastic lace disk is reduced again, then it jumps back to its unloaded position, but the contact bridge remains in the open position through the first spring elastic lace disk. A new pressure on the activation head now causes the switching pattern to press the contact bridge down, so that the first spring-loaded elastic disc jumps back to its first stable position, in which the switch is closed . The adjusting force of the second spring elastic lace disk must be greater than that of the first spring elastic lace disk.

From US 4,908,596 A temperature-dependent switch is known, in which a bimetallic elastic snap disk acts through a pusher on a switching arm, which carries a movable contact piece at its free end , which collaborates with a stationary opposite contact.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

The bimetallic elastic snap disk is fixed on a spring disk on a projection of the temperature-dependent switch housing. The spring disk allows an elastic switching of the bimetallic elastic lace disk and dampens the movement of the bimetallic elastic lace disk during the switching process and should improve the heat exchange between the bimetallic elastic lace disk and the housing.

It is known from US 2013/0057381 A1 mentioned at the beginning a temperature-dependent switch, which is retained after the switching temperature has been exceeded through the spring elastic fitting in its open position. By means of a manually operated pin, the switch can be returned against the force of the spring elastic snap piece back to the closed position.

Starting from this state of the art, the task of the present invention is to develop the switch mentioned at the beginning in such a way that with a simpler and more economical structure it prepares, also in the case of higher switching currents, still a sufficient number of switching cycles.

According to the invention, this task is solved in a switch mentioned at the beginning because the pusher has a rod, which has a narrowed section at its first end, which has a widened head in front of the narrowed section, in which on the section The bimetallic part and, where appropriate, the spring elastic snap piece with its respective bore hole are arranged, so that the bimetallic piece and the spring snap piece, if necessary, are maintained with play between the head and the rod, so that the spring elastic snap piece and the bimetallic piece transmit pressure and tensile forces on the pusher.

Here it is advantageous that the closing speed is still lifted through the elastic spring fitting.

This leads to the new switch also exceeding the required number of switching cycles with high switching currents.

A "spring elastic lace piece" means within the framework of the present invention a spring piece, which has two stable geometric configurations, as is known, in general, for spring elastic lace discs in switches dependent on the temperature. Through the bimetallic piece the spring elastic lace piece is pressed from one of its configurations in the direction of the other stable geometric configuration until the spring elastic lace piece then jumps completely suddenly.

When the pusher now transmits, as opposed to the known switch, not only during the opening of the switch, but also during the closing of the switch the movement of the bimetallic piece on the spring piece, the closing speed, which is determined by according to the invention not only through the spring piece, that is, the closing spring.

The inventors of the present application have recognized with the help of the tests and considerations that have led to the present invention that, under certain conditions, the forced coupling between the pusher and the spring piece can be dispensed with.

When only the spring elastic fitting and the bimetallic part are connected to the pusher, the advantage of the high opening speed is maintained. When the switch is closed, the pusher is retracted through the combined action of the spring elastic fitting piece and the bimetallic part, in addition, so quickly that the closing speed against the switch known from the document is also clearly raised. DE 10 2011 016 896 B3.

The task on which the invention is based is solved in this way completely.

The switch can be provided, respectively, with a heating resistor for the defined temperature-dependent switching and, if necessary, additionally with a self-holding resistor, so that the open switch does not cool and automatically close again.

In this case, it is preferable that the spring elastic snap piece and the bimetallic piece are disposed at the first end of the pusher and the spring piece is disposed at a second end of the pusher, preferably presenting the shaft at its second end a narrowed section, which has a widened head in front of the narrowed section, so that on the narrowed section the spring piece is arranged with a through hole, such that the spring piece is maintained with play between the head and the shaft .

These measures are advantageous from the constructive point of view. They simply make sure that the spring part, the bimetallic part and the spring elastic fitting are fixed in the pusher so that between them traction forces and pressure forces can be transmitted.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

The narrowed section can be configured with the head or the cane in one piece, so that either the narrowed section is inserted in a blind hole provided in the cane or the head is placed over the narrowed section. The head can also be configured as a rivet, whose bolt is inserted in a blind hole provided in the narrowed section.

In addition, it is preferred that the bimetallic part is configured as an elongated tongue, which is arranged on its opposite narrow sides, respectively, between two against supports, which are opposed in the longitudinal direction of the pusher, more preferably, the elastic fitting piece Spring is configured as an elongated tongue, which is arranged on its opposite narrow sides, respectively, between two against supports, which are opposed in the longitudinal direction of the pusher, more preferably the bimetallic part is configured as a bimetallic disk, which is arranged at its edge between two against supports, which are opposed in the longitudinal direction of the pusher, more preferably, the spring elastic lace piece is configured as a spring elastic lace disk, which is arranged on its edge between two against supports , which are opposite in the longitudinal direction of the pusher.

These measurements refer to the possible configurations of the spring elastic snap piece and the bimetallic piece as an elongated tongue or disc. In this regard, a "disk" means within the framework of the present invention a generally round, circular, oval or rounded piece.

In general, it is preferred that the first and second outer connection are fixed in an insulating body, so that preferably the first and second outer connection are configured as first and second connection plates, respectively, so that the two plates of connection are projected outside the insulating body, and the insulating body is arranged in a housing, more preferably the spring piece has a first and a second arm, the mobile contact piece is fixed on the first arm, the second arm it is electrically connected with the second connection plate, and the pusher is arranged between the first arm and the bimetallic part, more preferably the housing has an upper side and a lower side, which are joined together on narrow sides, and the housing has a hole on one of its narrow sides and engages with this hole on the insulating body, more preferably the two arms bend outwards from the pusher to interrupt a conductive connection between the two connection plates, more preferably the second arm rests on the second connection plate, more preferably the insulating body is composed of two partial bodies, and the two plates of connection are arranged between the two partial bodies.

In addition, it is preferred that the bimetallic part is arranged in a cavity on an outer side of the insulating body, more preferably the elastic spring fitting is arranged in a cavity on an outer side of the insulating body, and finally in the The cavity is provided with a ring inserted from the outside, which serves as a support for the spring elastic snap piece and / or the bimetallic piece.

These measures are advantageous from the constructive point of view, lead to an economical compact switch.

In this case it is preferred that the bimetallic part is arranged between the pusher and the spring elastic fitting.

It is advantageous here that the spring elastic snap piece is arranged outside the bimetallic piece and protects it.

Alternatively, it is preferable that the spring elastic snap piece is disposed between the pusher and the bimetallic piece.

Here it is advantageous, on the one hand, that the bimetallic part that is arranged outside can be fitted well to an apparatus to be protected, being, in addition, advantageous that also without forced coupling between pusher and bimetallic part as well as elastic fitting piece of spring the bimetallic part carries the spring elastic lace piece, which is located on it in the direction of the pusher, during the opening of the switch very quickly to commutation by elastic lace.

Other advantages are deduced from the description and the attached drawing.

It is understood that the features mentioned above and the features explained below can not only be applied in the combination indicated in each case, but also in other combinations or in particular, without abandoning the scope of the present invention.

Examples of embodiment of the invention are shown in the attached drawing and are explained in detail in the following description. In this case:

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

Figure 1 shows a schematic longitudinal section not shown at exact scale through a first embodiment of a first example of the realization of a temperature dependent switch, in which in a switching mechanism a mobile contact piece collaborates with a stationary contact piece, and in which a pusher is arranged between a bimetallic piece and a spring piece.

Figure 2 shows an exploded schematic representation of a switch, using the switching mechanism of Figure 1.

Figure 3 shows the mounted switch of Figure 2 in a longitudinal section.

Figure 4 shows the switch of Figure 3 in top plan view, but without housing.

Figure 5 shows in a representation like Figure 1 a second embodiment for the temperature dependent switch; Y

Figure 6 shows in a representation like Figure 1 an exemplary embodiment that does not belong to the present invention for the temperature dependent switch.

Figure 1 shows a first embodiment of a temperature dependent switch 10 shown in a very schematic way, comprising a first and a second external connections 11, 12 as well as a switching mechanism 14 which, depending on the temperature, establishes or closes a conductive connection of electricity between the external connections 11, 12.

The switching mechanism 14 comprises a stationary contact piece 15 conductively connected with the first external connection and a mobile contact piece 16 that collaborates with the stationary contact piece, which is fixed in a spring piece 17, which It is conductively connected to the second connection piece 12 and acts as a closing spring, which presses the mobile contact piece 16 against the stationary contact piece 15.

The spring piece 17 is configured in this simplified embodiment as a spring sheet, which is fixed in the area of the second outer connection 12 in an insulating body 18 represented only schematically, in which the first connection is also fixed exterior 11 and stationary contact piece 15.

The switching mechanism 14 further comprises a bimetallic part 19 and a pusher 21 disposed between the bimetallic part 19 and the spring part 17. The spring part 17 and the bimetallic part 19 are arranged at opposite ends 20a and 20b of the pusher. twenty-one.

In a manner known per se, the bimetallic part 19 presses, when a switching temperature is exceeded, the pusher 21 against the spring part 17 and thus elevates the movable contact part from the stationary contact part 15.

The bimetallic part 19 is made in the exemplary embodiment shown as an elongated tongue, which are arranged on their opposite narrow sides 22 and 23, respectively, with mechanical play, sufficient for the elastic spring switching, between two against supports 25, 26 which they oppose in the longitudinal direction 24 of the pusher 21. The upper counter supports 25 form part of the insulating body 18, while the lower counter supports 26 are configured as a fixing ring for the bimetallic part 19.

The pusher 21 is connected on an upper head 27 and a lower head 28 for traction and pressure with the spring piece 17 or the bimetallic piece 19. Between a shaft 29 of the pusher 21 and the lower head 28 a narrow section 31 is provided. , on which the bimetallic piece 17 sits with game. Also the spring piece 17 can be fixed with play on the pusher 21. The head 27 and the head 28 are made widened in front of the narrowed section 31 or the rod 29.

The rod 29 of the pusher is guided in a through hole 30 arranged in the insulating piece 18, to protect it from tilting and / or interlocking.

In the switching state shown in Figure 1, the switch 10 is closed. The spring piece 17 presses the mobile contact piece 16 on the stationary contact piece 15, so that between the two external connections 11, 12 the current circuit is closed and the operating current of a device to be protected flows through of the spring piece 17.

The narrow sides 22, 23 of the bimetallic part, which is in its first geometric configuration, rest on the upper counter supports 25 and thus support the closing pressure, with which the mobile contact piece 16 presses on the stationary contact piece 15.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

In the event that its switching temperature or reaction temperature is exceeded, the bimetallic part 17 switches to its other geometric configuration, such that the narrow sides 22, 23 are supported with the lower counter support 26, so that the bimetallic part 17 presses the pusher 21 in figure 1 upwards along the arrow 32. In this way, the pusher 21 presses the spring piece 17 upwards, so that the movable contact piece 16 rises from the stationary contact piece 15 and the current circuit is opened.

If the temperature of the bimetallic part 19 is reduced again, then it jumps back to its first geometric configuration, which is shown in Figure 1. In this case, it exerts through the pusher along the arrow 32 downwards a pulling force on the spring piece 17, thereby raising the closing speed, with which the mobile contact piece 16 rests again on the stationary contact piece 15, facing a structure of the switching mechanism 14, wherein the bimetallic part 19 exerts only a force of pressure on the spring part 17.

Parallel to the bimetallic part 19, a spring elastic lace piece 33 is arranged in the same manner as an elongated tongue at the end 20b of the pusher 21, whose opposite narrow sides 34 and 35 are in the same way with play between the counter supports 25 and 26.

The elastic spring fitting piece sits in the same way with play on the narrow section 31 of the pusher 21, so that it can exert pressure and traction forces on the pusher 17 through the pusher.

The spring elastic fitting 33 can either be arranged in this case between the bimetallic part 19 and the pusher 21 or on the side of the bimetallic part 19, which moves away from the pusher 21, as shown in figures 1 to 5.

The spring elastic fit piece 33 further elevates the dynamics of the switching mechanism switching 14. In the manner described above, the closing speed is further increased, because also the elastic fit piece of spring 33, during the closing of the switch 10, switches from one of its stable configurations, in which the narrow sides 34, 35 rest on the counter supports 26, again to its other stable configuration, in which the narrow sides are they rest on the counter supports 25. In this case, the spring elastic snap piece 33 exerts, like the bimetallic piece 18, through the pusher 21 a tensile force on the spring piece 17.

The elastic switching of the spring elastic fitting 33 between its two stable geometric configurations is triggered through the temperature-dependent elastic switching of the bimetallic piece 19 between its two geometric configurations.

Since the elastic spring fitting piece 33 also exerts a pressure force on the spring piece 17 through the pusher 21, the opening speed is also increased, with which the mobile contact piece 16 is raised from the spring piece. stationary contact 15, when the switch 10 opens through the elastic jump of the bimetallic part 19.

Figure 2 shows an exploded representation arranged for an example of concrete embodiment of the switch 10 of Figure 1.

The switch 10 comprises a two-part insulating body 18, which has an upper part 18a and a lower part 18b. The first external connection 1 is configured as an external connection plate 36, which carries the stationary contact piece 15. The second connection exterior 12 is configured as connection plate 37, which is electrically connected with the spring part 17, which has a first arm 39, in which the mobile contact part 16 is fixed.

The spring piece 17 also has a second arm 39, which extends parallel to the first arm 38 and has a lateral flap 41 protruding laterally, which during mounting supports with the second connection plate 37.

During the assembly of the switch 10, the connecting plates 36, 37 are interlocked and in the upper part thereon the spring piece 17 between the upper part 18a and the lower part 18b of the insulating body 18, such that the connection plates 36, 27 project laterally from the body of the insulator 18, as can be seen in the top plan view of the switch 10 assembled in Figure 4.

The insulating body 18 is then coupled into a flat housing 42 that can be recognized in Figure 2, because it has an upper side 43 and a lower side 44, which are connected to each other on narrow sides 45, so that the housing has one of its narrow sides 45 a hole 46 and engages with this hole 46 on the insulating body 18, as can be seen in Figure 3.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

The bimetallic part 19 is configured as a bimetallic disk 47 and the spring elastic lace piece 33 is configured as a spring elastic lace disc 48. Both discs have an edge 51 and 52, respectively, and are inserted into an open cavity 53 towards outside, arranged on the lower outer side 18c of the lower part 18b, such that they rest against surrounding supports 25a and 25b, respectively, of the lower part 18b, when the switch 10 is closed.

In the cavity 53, a ring 54 is inserted, which overlaps the edges 51, 52 radially inwards and forms the counter support 26, on which the bimetallic disk 47 and the spring elastic snap disk 48 with its edges 51 and 52, respectively, when they open switch 10.

Between the counter supports 25 and 26, the edges 51 and 52 are guided with mechanical play, so that the bimetallic disk 47 and the spring-loaded elastic disk 48 can be expanded during the elastic switching from one of its geometric configurations to its other geometric configuration.

The pusher 21 comprises the shaft 29 with the lower narrow section 31, on which the bimetallic disc 47 and the spring elastic snap disk 48 are coupled with their respective bore 55 and 56 with play.

After assembly, the pusher 21 extends through the through hole 30 configured in the bottom 18b.

The head 27 is provided with a bolt 57 and the head 28 is provided with a bolt 58. The bolt 57 is seated in an upper blind hole 61 in the channel 29, the bolt 58 is seated in a lower blind hole 62 in the area narrowed 31. Heads 27 and 28 are made widened in diameter in front of bolts 57 and 59 as well as in front of shaft 29.

The first arm 38 has a through hole 63, with which it is arranged on the bolt 57 with play.

In this way, the first arm 38 and the bimetallic disk 47 as well as the spring elastic snap disk 48 are connected to each other on tension and pressure.

If the pusher 21 is pressed during the opening of the switch 10 upwards, then flexibly separates the two arms 38, 39 of the spring piece 17.

In Figure 5 a switch 10 'is shown in a second embodiment and in Figure 6 a switch 10' 'is shown in an example of embodiment that does not belong to the invention, respectively, in a representation as in Figure 1 The same reference signs designate identical characteristics with identical properties, so that due to the structure of principle and the function of principle refer to the previous description in relation to Figure 1.

The switch 10 'of Figure 5 has only the lower head 28, on which the bimetallic part 19 and the spring elastic fitting 33 are connected with the pusher 21, such that they move it along the arrow 32 in Figure 5 up and down, when the bimetallic part 19 and as a result also the spring elastic fit piece 33 elastically switch from one of its respective geometric configurations to the other geometric configuration.

Therefore, although the head 27 is missing, there is no danger that the pusher 21 will be tilted or locked, since it is grooved in the through hole 30.

The spring piece 17 rests on the upper end 29a of the pusher 21, so that during the opening of the switch 20a through the combined pressure force of the bimetallic part 10 and the spring piece 33 is pressed very quickly upwards .

During the closing of the switch 10 ', the bimetallic part 19 jumps back to its configuration shown in Figure 5 and in this case pulls the pusher 21 downwards. Since the spring elastic fitting 33 is connected in the same way with the pusher 21, during this process it presses firstly where the pusher 21 strikes it downwards, until it also jumps elastically in the same way of return to its stable geometric configuration.

In this case, the spring piece 17 is not actively attracted by the pusher 17 downwards, because the head 27 of Figure 1 is not provided here. However, the switch 10 'closes faster than a switch without forced coupling between the pusher 21 and the bimetallic part 19 as well as the spring elastic fitting 33, because the pusher 21 moves so quickly downward that it does not oppose any resistance to the closing movement of the spring piece 17.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

65

Therefore, in the switch 10 'both the opening speed and the closing speed are increased, compared with a switch, in which only a bimetallic part 19 is provided, which is not coupled forced, in addition, with the pusher twenty-one.

Since in the switch 10 'the head 27 is dispensed with, the assembly is also configured simpler than in the switch 10 of Figures 1 to 4.

During the assembly, the insulating body 18 is assembled first, so that the two connecting plates 36, 37 and the spring piece 17 are interlocked between the upper part 18a and the lower part 18b.

The pusher 21 is then connected through the head 28 in an impermissible manner with the bimetallic piece 19 and the spring-loaded elastic piece 33, and then this unit is inserted in Figure 2 from below in the pre-assembled insulating body 18, it is that is, in cavity 53 at the bottom 18b. The pusher is driven in this case with its upper end 20a through the through hole 30 and is supported with its upper end 20a with the first arm 38.

In the switch 10 '' of figure 6, the lower head 28 is also dispensed with. As another difference with respect to the switch 10 and 10 ', in the switch 10' 'the bimetallic part 19 is arranged below the elastic fitting part spring 33.

Although the two heads 27, 28 are missing, there is also no danger that the pusher 21 bends or interlocks, since it is driven in the through hole 30.

When the temperature of the bimetallic part 19 rises beyond its jump temperature, the bimetallic part 19 jumps from the low temperature configuration shown in Figure 6 to its other geometric configuration. In this case, press in the center on the spring elastic lace piece 33, which is raised by flexing in this way little by little in its center to the point where it suddenly switches elastically to its other stable geometric configuration and together with the bimetallic part 19 suddenly presses the pusher up in figure 6.

The spring piece 17 rests on the upper end 20a of the pusher 21, so that during opening of the pusher 20a also here through the combined pressure force of bimetallic piece 19 and spring piece 33 is pressed very quickly upwards .

During the closing of the switch 10 ', the bimetallic piece 19 jumps back to its configuration shown in figure 6. The return piece 17 person now through the pusher 21 on the spring elastic fitting piece 33 and presses it there where pusher 21 strikes it, downwards, until in the same way it jumps elastically back to its other stable geometric configuration shown in Figure 6.

In this case, therefore, the spring piece 17 is not actively trapped through the pusher 17 downwards, because it is also not provided here the head 27 of Figure 1. In spite of everything, the switch 10 'not only it opens more quickly than a switch without spring elastic snap piece 33, but with a corresponding design it can also be closed faster. This faster closing results because the bimetallic part 19 as a result of the elastic switching of the spring elastic fitting 33 moves so quickly downward that it no longer opposes any resistance to the pusher 21, when it moves through the movement of Close the spring part 17 again fully down to its position shown in Figure 6.

In the switch 10 '', therefore, at least the opening speed is increased compared to a switch, in which only a bimetallic part 19 is provided.

Since in the switch 10 'the head 27 is dispensed with, the assembly is configured simpler than in the switch 10 of Figures 1 to 4.

First, the insulating body 19 is assembled in such a way that both connecting plates 36, 37 and the spring piece 17 are interlocked between the upper part 18a and the lower part 18b.

Next, the pusher 21 is driven with its upper end 20a through the through hole 30 and is supported with its upper end 20a with the first arm 38, Then the spring elastic fitting 33 is inserted and then the bimetallic part 19 in the cavity 53.

Claims (17)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty I. - Temperature dependent switch with a first and second external connections (11, 12), with a stationary contact piece (15), which is conductively connected with the first external connection (11), with a mobile contact piece (16) that collaborates with the stationary contact piece (15), which is fixed in a spring piece (16), which is conductively connected with the second external connection (12), and which presses the mobile contact piece (16) against the stationary contact piece (15), with a bimetallic piece (19) and with a pusher (21) disposed between the bimetallic piece (19) and the spring piece (17) , in which the bimetallic part (19), in the event that a switching temperature is exceeded, presses the pusher (21) against the spring part (17) and thus raises the mobile contact part (16) from the stationary contact piece (15), and with a spring elastic snap piece (33) which, at least in the case that the switching temperature is exceeded, presses the pusher (21) against the spring piece (17), characterized in that the pusher (21) has a shaft (29), which has its first end (20b) a narrowed section (31), which has a head (28) widened in front of the narrowed section (31), in which on the narrowed section (31) the bimetallic part (19) and the piece of spring elastic lace (33) with its respective bore hole (55, 56), such that the bimetallic part (19) and the spring elastic lace part (33) are kept in play between the head (28) and the rod (29), so that the spring elastic fitting piece (33) and the bimetallic piece (19) transmit pressure and tensile forces on the pusher (21). 2- Temperature dependent switch according to claim 1, characterized in that the spring elastic fitting (33) and the bimetallic part (19) are arranged at the first end (20b) of the pusher (21) and the part spring (17) is arranged at a second end (20a) of the pusher (21). 3. - Temperature dependent switch according to claim 1 or 2, characterized in that the bimetallic part (19) is arranged between the pusher (21) and the spring elastic fitting (33). 4. - Temperature dependent switch according to claim 1, characterized in that the spring elastic fitting (33) is arranged between the pusher (21) and the bimetallic part (19). 5. - Temperature dependent switch according to one of claims 1 to 4, characterized in that the cane (29) has a narrowed section at its second end (20a), which has a head (27) widened in front of this section narrowed, in which on this narrow section the spring piece (17) is arranged with a through hole (63), such that the spring piece (17) is retained with play between this head (27) and the shaft (29). 6. - Temperature dependent switch according to one of claims 1 to 5, characterized in that the bimetallic part (19) is configured as an elongated tongue, which is arranged on its opposite narrow sides (22, 23), respectively, between two against supports (25, 26), which are opposed in the longitudinal direction (24) of the pusher (21). 7. Temperature dependent switch according to one of claims 1 to 6, characterized in that the spring elastic fitting (33) is configured as an elongated tongue, which is arranged on its opposite narrow sides (34, 35), respectively, between two counter supports (25, 26), which are opposed in the longitudinal direction (24) of the pusher (21). 8. - Temperature dependent switch according to one of claims 1 to 5 or 7, characterized in that the bimetallic part (19) is configured as a bimetallic disk (47), which is arranged on its edge (51) between two against supports (25a, 54), which oppose in the longitudinal direction (24) of the pusher (21). 9. - Temperature dependent switch according to one of claims 1 to 6 or 8, characterized in that the spring elastic fitting piece (33) is configured as a spring snapping disc (48), which is arranged in its edge (52) between two against supports (25b, 54), which oppose in the longitudinal direction (24) of the pusher (21). 10. - Temperature dependent switch according to one of claims 1 to 9, characterized in that the first and second external connection (11, 12) are fixed in an insulating body (18). II. - Temperature dependent switch according to claim 10, characterized in that the first and second external connection (11, 12) are configured as first and second connection plate (36, 37), respectively, whose two connection plates ( 36, 37) project outside the insulating body (18), and the insulating body (18) is arranged in a housing (43). 12. Temperature-dependent switch according to claim 11, characterized in that the spring piece (17) has a first and a second arm (38, 39), the mobile contact piece (16) is fixed on the first arm (38), the second arm (39) is electrically connected with the second connection plate (37), and the 5 10 fifteen twenty 25 pusher (21) is disposed between the first arm (38) and the bimetallic part (19). 13. - Temperature dependent switch according to claim 11 or 12, characterized in that the housing (42) has an upper side (43) and a lower side (44), which are joined together on narrow sides (45) ), and the housing has a hole on one of its narrow sides (45), and is plugged with this hole (46) onto the insulating body (18). 14. - Temperature dependent switch according to claim 12 or 13, characterized in that the two arms (38, 39) bend outwards under the interruption of the conductive connection between the two connection plates (36, 37) from the pusher (21). 15. - Temperature dependent switch according to one of claims 12 to 14, characterized in that the second arm (39) is supported by the second connection plate (37). 16. - Temperature dependent switch according to one of claims 11 to 15, characterized in that the insulating body (18) is composed of two partial bodies (18a, 18b), and the two connecting plates (36, 37) they are between the two partial bodies (18a, 18b). 17. - Temperature dependent switch according to one of claims 10 to 16, characterized in that the bimetallic part (19) is arranged in a cavity (53) on an outer side (18c) of the insulating body (18). 18. - Temperature dependent switch according to one of claims 10 to 17, characterized in that the spring elastic fitting (33) is arranged in a cavity (53) on an outer side (18c) of the insulating body (18). 19. - Temperature dependent switch according to claim 17 or 18, characterized in that a ring (54) inserted from the outside is provided in the cavity (53), which serves as a counter-support for the spring elastic snap piece (33) and / or the bimetallic piece (19).