EP1463080B1 - Method for producing a relay and a relay - Google Patents

Abstract

Each relay yoke plate (11) is placed in an exact position with respect to the electric contacts, and they are held by a first carrier band (5) during the spraying process. There are two contact strips (7,8) mounted on connecting strips (9,10) attached to the first carrier band. A second carrier band (6) has distance pieces (23) carrying the yoke plates. Components are carried through several manufacturing steps (P1-14) on three lines (R1-3). Components are moved from the first and third lines onto the second line to help assemble the finished relays.

Description

The invention relates to a method for manufacturing a relay unit and a relay unit.

Electromagnetic relays are used in various technical fields, in particular in motor vehicle technology. The development and manufacture of the relay is subject to a high cost pressure, so that a simplification of the structure and a cost-effective production of the relay is sought. The construction of the relays requires precise dimensions to be met for precise operation. For example, it is necessary that the switch contacts, with which an electrically conductive connection between two contact terminals is made, have a predetermined distance. This determines the switching behavior of the relay. Furthermore, it is advantageous if the position of the armature, which actuates a switching contact, is also defined precisely in the relay. Anchors are held, for example via spring elements on the relay, so that their geometry and position is precisely observed.

In the not yet published European patent application with the application number 02 025 435.5, a relay is described in which a magnetic coil is provided with an L-shaped yoke, which is injected in an encapsulation process in a structural unit with a contact terminal. Thus, the position of the yoke is fixed to the position of a contact in a single extrusion process. Thus, a secure and cost-effective fixation of the positions is given.

From DE 19627845 C1 a generic method for producing an electromagnetic relay is known, which is formed from two half-shells. A first half shell is formed by molding a coil with a U-shaped core. The second half-shell is formed by encapsulation of a spring carrier and at least one spring contact element. On the spring carrier a contact spring is attached with a flat anchor. By joining the two half-shells, a relay is adjusted and at the same time sealed.

From WO 88/105505 a method for producing a relay unit is known in which electrical contacts of the relay are provided in the form of a stamped grid and a housing is molded onto the stamped grid. Subsequently, the peripheral frame of the stamped grid is removed and it is obtained a base plate with injected contacts of the relay unit. In the base plate, a solenoid coil is inserted with yoke and then closed the unit with a lid.

From US 5,309,623 a method for producing a relay unit is known, wherein moving contacts are present in a stamped grid and are connected in an encapsulation process with an armature to form a structural unit. The relay unit also has a housing into which electrical contacts are injected.

The object of the invention is to provide a simple method for producing a relay unit and a simple relay in which the yoke and the switch contacts are precisely adjusted to each other.

The object of the invention is achieved by the method according to claim 1 and by the relay according to claim 7.

An advantage of the method according to the invention is that an exact position between the yoke and the switch contacts is set in a single encapsulation process. In this case, the first and the second switching contact connection connected to each other via a connecting piece during the extrusion process. As a result, the position of the first and the second switching contact with each other is precisely determined. The connecting piece is arranged outside the relay unit produced during the encapsulation, so that the connecting piece can be disconnected from the two switching contacts after the encapsulation process and, as a result, separate switch contacts are obtained. This allows an exact positioning of the yoke with respect to two switching contacts and also an exact positioning of the two switching contacts to one another.

The yoke is formed as part of a first carrier tape and the switch contacts as part of a second carrier tape. Through the use of carrier tapes, a simple and cost-effective handling of the parts during the encapsulation process is possible. The position of the parts is prefixed via the carrier tapes so that a high degree of automation is achieved.

Consequently, it is not necessary to keep the individual parts with elaborate holding devices separately in order to achieve the precise positioning required during the extrusion process. The essential holding function is realized by the carrier tapes.

In addition, the second switching contact is encapsulated during extrusion coating, which is also part of the second carrier tape. Due to the design of the second switching contact as part of the second carrier tape, it is not necessary to additionally hold a third carrier tape during the overmolding process. This offers advantages in particular in that two carrier bands can be arranged on opposite sides of the relay unit without disturbing each other. Although it would be possible to arrange two carrier tapes on one side of the relay unit during the overmolding process, this would make increased demands on the structure of the holding and transport systems of the carrier tapes, since the available space would be cramped.

The relay according to the invention has a simple and inexpensive to manufacture structure.

Further advantageous embodiments of the invention are specified in the dependent claims.

The carrier tapes preferably have, for example, holding holes over which the carrier tapes are precisely guided.

Depending on the embodiment, a thin cover of the yoke can be made in the bearing surfaces of the armature. This sets a defined air gap between the yoke and the armature.

In a preferred embodiment of the method according to the invention, the second switching contact is arranged parallel and under a second leg of the yoke. The second switching contact protrudes beyond both ends of the leg, wherein one end of the second switching contact is a contact surface for connecting a contact spring and the second end is led out of the relay unit.

In a preferred embodiment, the anchor is substantially formed as a rectangular plate which is supported by a contact and spring plate on three sides of the plate. In this case, the Federblechstück is guided on an upper side of the plate, and folded around the plate to the bottom and preferably with the anchor by e.g. Riveting or welding connected. Starting from the bottom, a contact piece extends substantially perpendicular to the alignment of the spring piece parallel to the arrangement of the armature. In this way, a good support between the armature plate and the contact spring is obtained in a simple and cost-effective manner.

In an advantageous embodiment, an electrical conductor is provided, which produces an electrically conductive connection between the second contact terminal and the contact rivet which is held on the armature. As a result, high currents can be switched loss.

Fig. 1A, 1B

eine perspektivische Darstellung und eine Ansicht von oben auf ein Relais,

Fig. 2

eine schematische Übersicht über einen Prozess zur Herstellung eines Relais,

Fig. 3

einen ersten Teilabschnitt des Prozesses,

Fig. 4

einen zweiten Teilabschnitt des Prozesses,

Fig. 5

einen dritten Teilabschnitt des Prozesses,

Fig. 6A-6D

einen Prozess zur Herstellung einer Kontaktfeder mit Anker,

Fig. 7

ein teilaufgeschnittenes Relais,

Fig. 8

ein teilaufgeschnittenes Relais mit offenem Stromkreis,

Fig. 9

ein teilaufgeschnittenes Relais mit dem Anschlussbereich zwischen Kontaktfeder und zweitem Kontaktanschluss,

Fig. 10

eine Draufsicht auf eine weitere Ausführungsform des Relais,

Fig. 11

einen ersten Querschnitt durch die weitere Ausführungsform,

Fig. 12

einen zweiten Querschnitt durch die weitere Ausführungsform,

Fig. 13

ein Relais mit Steckanschlüssen, und

Fig. 14

eine Seitenansicht der Steckanschlüsse.

Furthermore, the electrical conductor has the advantage that the choice for the material of the spring member is no longer limited to electrically conductive materials. The invention will be explained in more detail below with reference to FIGS. Show it

Fig. 1A, 1B

a perspective view and a view from above of a relay,

Fig. 2

a schematic overview of a process for producing a relay,

Fig. 3

a first part of the process,

Fig. 4

a second subsection of the process,

Fig. 5

a third section of the process,

Figs. 6A-6D

a process for producing a contact spring with armature,

Fig. 7

a partially cut relay,

Fig. 8

a partially cut open circuit relay,

Fig. 9

a partially cut-out relay with the connection area between the contact spring and the second contact connection,

Fig. 10

a plan view of a further embodiment of the relay,

Fig. 11

a first cross section through the further embodiment,

Fig. 12

a second cross section through the further embodiment,

Fig. 13

a relay with plug connections, and

Fig. 14

a side view of the plug connections.

1A and 1B show a perspective view of a relay 1 and a representation of the top of the relay 1. The relay 1 has a substantially cuboid shape, wherein on a back two coil terminals 2 are arranged, which are for electrically connecting a power supply for a Serve coil of the relay 1. At a front side two contact terminals 3, 4 protrude out of the relay 1. The contact terminals 3, 4 are used to connect two lines that are electrically connected or disconnected via the relay depending on the switching state of the relay.

2 shows a schematic overview of a process for producing the relay 1. In this case, the production steps of three different subunits are shown in three rows R1, R2, R3. The manufacturing steps are subdivided into fourteen production steps P1 to P14 for all three rows R1, R2, R3.

In a first row R1, the manufacturing steps for producing an armature with contact spring are shown. In a second row R2, the manufacturing steps that are performed to produce the relay 1 are shown.

In a third row R3, the manufacturing steps for producing the two contact terminals 3, 4 are shown. A significant advantage of the manufacturing method shown in Fig. 2 is that the contact terminals 3, 4 and a magnetic coil 13 with a yoke plate 11 on carrier tapes 5, 6 during extrusion coating, in which the contact terminals 3, 4 with the magnetic coil and the yoke plate molded together be, are held.

At a first position P1, a second carrier tape 6 has a yoke plate 11. The yoke plate 11 has a substantially U-shape with two legs 21, 22. A center piece 20 connects the two legs 21, 22. The middle piece 20 later serves as a magnetic core. The second carrier tape 6 and the yoke plate 11 are preferably produced in a stamping process, wherein the yoke plate 11 is formed integrally with the second carrier tape 6 via a spacer 23. The spacer 23 is arranged parallel to the direction of the middle piece 20. In the following second production position P2, a coil frame 12 is injection-molded onto the yoke plate 11, wherein coil terminals 2 are also integrated. In a following third production position P3, the first carrier tape 5 is shown in the third row R3, which is formed integrally with a first and a second contact strip 7, 8. The first and second contact strips 7, 8 are arranged substantially parallel to the longitudinal direction of the first carrier strip 5. The first contact strip 7 is connected to the first carrier strip 5 via a first connecting piece 9. The second contact strip 8 is connected to the first contact strip 7 via a second connecting piece 10. The first contact strip 7 has a hole into which a contact rivet 19 is introduced at a following fifth production point P5.

In the transition from the third production position P3 to the fourth production position P4 is in the coil frame 12 a Coil winding 13 is introduced, whose ends are connected to the coil terminals 2.

In the transition from the fifth to the sixth production position P5, P6, the first and the second carrier tape 5, 6 brought into a mounting position to each other, wherein the first and second contact strips 7, 8 are arranged below the yoke plate 11. The second contact strip 8 is arranged directly below the second leg 22 of the yoke plate 11, wherein the second contact strip 8 projects beyond the ends of the second leg 22 on both sides. The first contact strip 7 is preferably arranged in the region between the first and the second leg 21, 22, but below the first and the second leg 21, 22. Instead of the illustrated embodiment, the first contact strip 7 may also be arranged above the first and second legs 21, 22. The contact rivet 19 of the first contact strip 7 is arranged in front of the encapsulated magnetic coil 13. In the transition from a following seventh manufacturing position P7 to an eighth manufacturing position P8, a relay unit is manufactured by an overmolding process in which the yoke plate 11 is fixedly fixed in position to first and second contact strips 7, 8, which are contact terminals 3, 4. In this case, a bottom plate and side walls 24 are molded. The bottom plate and the side walls 24 are integrally made of plastic. The first and second connecting pieces 9, 10 are arranged outside the side walls 24. In addition, the spacer 23 of the second carrier tape 6 is arranged outside the side wall 24. Through the bottom plate, the yoke plate 11 with the encapsulated coil 13 fixed to the first and second contact strips 7, 8 fixed in a relay unit. In addition, the coil 13 is over-molded with the coil frame 12 in a coil block 25.

2, the production positions for producing an armature spring unit 31 are shown in the first row R1.

The armature spring unit 31 is inserted at the tenth manufacturing point P10 in the relay unit. In this position, the relay unit is held only by the first carrier tape 5. In the transition between the ninth to the tenth manufacturing position, the second carrier tape 6 was separated from the relay unit.

The transport devices required for transporting the carrier belts 5, 6 are not shown in FIG. 2 for the sake of clarity. For the extrusion process, an injection mold is used, which is injected with plastic. The plastic is electrically insulated. For producing the yoke plate 11, a soft magnetic sheet strip is used. At the twelfth production position P12, the first carrier tape 5 is cut off from the relay 1. At the following thirteenth production position P13, the relay 1 is closed with a lid 17. At the following fourteenth production position P14, a complete relay 1 is manufactured.

In Fig. 3, the first four production positions P1 to P4 for the second row R2 are shown on a larger scale. In this case, clearly the two side parts of the coil frame 12 and the introduced coil terminals 2 can be seen. After the wrapping of the coil frame 12 with the coil 13, end pieces 25 of the coil wire are connected to the coil terminals 2. The coil terminals 2 are formed in the form of pins which are passed through a part of the coil frame 12. The lower ends of the coil terminals 2 are bent in the transition from the third to the fourth production position P3, P4 parallel to the second carrier tape 6 and pointing away from the coil 13.

4 shows, in an enlarged view, the fifth to ninth production positions P5, P9 for the second and third rows R2, R3. In the illustration of the sixth production position P6, the first and second contact strips 7, 8 disposed below the yoke plate 11 and the second contact strip 8 protrudes on both sides beyond the ends of the first leg 21 of the yoke plate 11 also. The second end of the second contact strip 8 terminates flush with the coil frame 12. In the eighth production position P8, a part of the bottom plate 26 is arranged between the first leg 21 and the second contact strip 8, which was produced by the extrusion coating process. The first contact strip 7 is both encompassed by a front wall 37 and laterally embedded in the coil block 28. The region of the first contact strip 7, in which the contact rivet 19 is arranged, is not encapsulated with the encapsulation process, but kept free. Furthermore, a contact space 27 is not encapsulated, which is arranged between a rear wall 36 and the first leg 21. The surfaces of the legs 21, 22 of the yoke plate 11 are not covered during extrusion coating. Thus, in the contact space 27, the top of the second end piece of the second contact strip 8 is freely accessible.

Fig. 5 shows an enlarged view of the tenth to thirteenth production point P10, P13 for the first and second series R1, R2.

In the tenth manufacturing position P10, the relay unit has a cuboid coil block 28 which is incorporated in a housing of two side walls 24, a front wall 37 and a rear wall 36. Between the coil block 28 and the front wall 37, an armature space 29 is formed, which extends over the entire side length of the front wall 37. Between a side wall 24 and the coil block 28, a spring chamber 30 is formed. The armature space 29 and the spring space 30 overlap in a corner region and are aligned perpendicular to each other. In the armature space and in the spring chamber 29, 30, the armature / spring unit 31 is inserted, wherein jointly a spring member 16 in the spring chamber 30 and an armature 15 are inserted into the armature space 29 from above.

The armature spring unit 31 has an L-shape in the basic form, which is arranged parallel to two side edges of the coil block 28.

The armature 15 is substantially formed as a rectangular plate which is supported in a spring contact assembly 32. The spring contact arrangement 32 has the spring part 16, which is formed integrally with a contact spring part 33.

The spring part 16 has a downwardly bent contact region 39, which is inserted in the assembly of the armature spring unit 31 in the contact space 27 and is firmly connected to the second contact strip 8.

6A to 6D show three different manufacturing steps in the manufacture of the armature spring unit 31. FIG. 6C shows the armature spring unit 31, which consists of the spring contact arrangement 32, which is stamped from a spring plate and bent accordingly. FIG. 6A shows the spring contact arrangement 32, which consists of the spring part 16, which is arranged substantially perpendicular to the contact spring part 33. The spring member 16 is formed as a narrow plate, which connects to an upper holding plate 34. The upper holding plate 34 is substantially rectangular in shape and arranged perpendicular to the longitudinal direction of the spring member 16. The upper holding plate 34 merges laterally into a connecting bracket 35, which is arranged substantially in the longitudinal direction of the spring part 16. The connecting bracket 35 is formed substantially L-shaped, with a shorter leg is connected to the upper support plate 34. Transverse to the longer leg of the connecting bracket 35, the downwardly bent contact spring part 33 is formed, which is arranged perpendicular to the spring member 16. To produce the armature spring unit, the armature 15 is inserted between the long legs of the connecting bracket 35 and the upper retaining plate 34, as shown in FIG. 6B. Subsequently, the upper holding plate 34 is pressed onto an upper side of the armature 15, wherein both the upper support plate 34 and the longer leg of the connecting bracket 35 are fixedly connected to the armature 15, for example by welding or riveting. The contact spring part 33 is arranged in parallel and under the armature 15. Preferably, the contact spring 33 has a second Kontaktniet 40 which is fixed on an underside of the contact spring 33. A free end of the spring member 16 is bent downwards and merges into a contact region 39, which is arranged almost parallel to the upper holding plate 34, as shown in Figure 6C. Thus, the spring member 16 in cross-section at the free end of an S-shape, as shown in Figure 6D. The contact region 39 serves for the mechanical fastening of the spring part 16 on the second contact strip 8 in the contact space 27.

Fig. 7 shows a representation of the relay 1 from a front side, wherein the front wall 37 is partially opened. In this view, the embedding of the first and second contact strips 7, 8 in the bottom plate 26 can be seen clearly. The upper side of the first contact strip 7 is not covered with encapsulation material, at least in the region of the contact rivet 19. Also, the surfaces of the first and second leg 21, 22 have not been covered with Umspritzmaterial during extrusion coating. The armature 15 is arranged transversely to the first and the second leg 21, 22 and preferably lies in the region of the upper retaining plate 34 on the first leg 21. Fig. 7 shows the relay in a closed position in which the armature 15 rests on the second leg 22 and thereby an electrically conductive connection between the first contact strip 7 and the contact spring part 33 is made. In this case, the second contact rivet 40 rests on the first contact rivet 19. The spring member 16 is disposed between a side wall 24 and the coil block 28.

In the closed position of the armature 14, as shown in Fig. 7, an electrically conductive connection between realized the first and second contact terminal 3, 4, since the first contact strip 7 via the contact spring member 33 and the spring member 16 with the second contact strip 8 are electrically connected.

FIG. 8 shows the relay 1 in an open switching position, in which the second contact rivet 40 is lifted off the first contact rivet 19. In this position, the armature 15 is still on the first leg 21, but is lifted from the second leg 22. The armature 15 is resiliently supported by the spring contact assembly 32, with the rest position of the armature 15 corresponding to the open position as shown in FIG. Only by energizing the magnetic coil 13, an electromagnetic field is generated which pulls the armature 15 in the closed position shown in FIG. 7.

Fig. 9 shows a view of the relay 1 from the back, wherein the rear wall 36 of the relay 1 is partially cut. The spring member 16 is placed with the contact portion 39 on the second contact strip 8 and mechanically fixed to the contact strip 8. The connection is made for example via a welding or soldering layer. Thus, the armature 15 is resiliently supported. In addition, there is an electrically conductive connection between the second contact rivet 40 and the second contact strip 8.

By the selected embodiment, the spring member 16 can be made relatively long, so that a large elasticity is obtained. In addition, can be exploited by the vertical arrangement of the spring member 16 with respect to the tilting plane of the armature 15 when changing from the open to the closed position of the armature 15 perpendicular to the longitudinal axis adjusting distortion of the spring member 16 for resilient mounting of the armature 15. This also supports the desired spring elasticity of the holder of the armature 15. Furthermore, by the lateral arrangement of the armature 15 which is fixedly connected in one end region with the spring member 16, an advantageous Switching situation to be obtained. Due to the large length of the armature 15, which is available for the pivoting movement of the armature 15, a large distance is covered in the region of the second leg 22 with a tilting of the armature 15 by a small angular range. Thus, only a slight rotation of the spring member 16 and thus a low stress of the spring member 16 is required for movement of the armature 15 from the open to the closed position.

FIG. 10 shows a further preferred embodiment of the relay 1, in which an electrical conductor 41, preferably a stranded wire, is electrically conductive with one end via the contact region 39 with the second contact 8 and with a second end with the second contact rivet 40 of the armature 15 is conductively connected. The electrical conductor 41 is inserted in the spring chamber 30 and in the armature space 29. In the armature space 29, the electrical conductor 41 is guided past the armature 15 between the armature 15 and the coil block 28 and is electrically conductively connected to the second contact rivet 40.

FIG. 11 shows a cross-section B-B through the relay of FIG. 10. In this case, the guidance of the electrical conductor 41 and the electrical connection to the second contact rivet 40 are clearly shown, which are held on the armature 15 via a contact-spring part 33.

FIG. 12 shows a section AA along the spring chamber 30 of FIG. 10. Here, the electrical contacting of the electrical conductor 41 at the contact region 39 and thus the electrically conductive connection between the second contact 8 and the electrical conductor 41 can be clearly seen. According to this embodiment, the contact region 39 of the spring part 16 is arranged between the electrical conductor 41 and the second contact 8. Depending on the embodiment, the electrical conductor 41 may be connected directly to the second contact 8 electrically conductive. This embodiment will then chosen, for example, if for the material of the spring member 16, a non-conductive material, such as spring steel, is used. The use of spring steel may be advantageous for achieving improved resilient properties of the bracket 15 of the anchor.

The use of the electrical conductor 41 allows a relatively low-loss conduction of currents of over 40 amperes. In addition, it is no longer necessary to use a good electrically conductive material for the spring member 16 due to the electrical conductor 41.

FIG. 13 shows a side view of a further embodiment of a relay, which essentially corresponds to the previously described embodiments, but wherein the first and second contact terminals 3, 4 are in the form of plug-in connections. The plug connections have the peculiarity that the end of the contact terminals 3, 4 tapers and is thus well suited to insert the relay 1 into corresponding electrical plug contacts, for example a printed circuit board. In this embodiment, the coil terminals 2 are disposed on the same side as the first and second contact terminals 3, 4 and also have a tapered shape in the end portion. The tapered shape is preferably formed of two conically arranged side surfaces 42, 43.

Claims (11)

1. A method of producing a relay unit having at least a first and a second switch contact (7, 8) and a yoke (11) with a magnet coil (13),
   characterised in that the first and second switch contacts (7, 8) are connected to a first carrier strip (5) and in that the yoke (11) is connected to a second carrier strip (6), in that the first carrier strip (5) is connected to a plurality of first and second switch contacts (7, 8), in that the second carrier strip (6) is connected to a plurality of yokes (11), in that the first and second carrier strips (5, 6) are brought into an assembly position, in that the first and second contacts (7, 8) are connected together during the process of injection moulding via a connecting piece (10), and in that the connecting piece (10) is arranged outside the relay unit, in that the switch contacts (7, 8) and the yoke (11) are connected firmly together using a process of injection moulding and in that the first and second switch contacts (7, 8) and the yoke (11) are separated from the carrier strips (5, 6) after the process of injection moulding.
2. A method according to claim 1, characterised in that surface portions of arms (21, 22) of the yoke (11) remain free of injection-moulding material during the process of injection moulding.
3. A method according to either one of claims 1 or 2, characterised in that the first switch contact (7) comprises a contact surface and a first contact terminal (3) and in that the second switch contact (8) comprises a second contact terminal (4) and a contact surface.
4. A method according to any one of claims 1 to 3, characterised in that the second switch contact (8) is arranged parallel to and beneath a second arm (22) of the yoke (11), wherein the second switch contact (8) projects beyond the second arm (22) on both sides, wherein one end of the second switch contact comprises the second contact terminal (4) and the second end comprises the contact surface for contacting an armature/spring unit (31).
5. A method according to claim 4, characterised in that an armature (15), with a contact (40) and an armature spring (38), is inserted into the relay unit, in that the armature (15) is arranged with one end above a second arm (22) of the yoke (11), in that the armature spring (38) is positioned with a contact area (38) on the contact surface of the second switch contact (8) and in that the armature spring (38) is firmly connected by the contact area (38) to the contact surface of the second switch contact (8), wherein the armature (15) is arranged with its second end above the first arm (21) of the yoke (11) and in that the contact (40) is associated with a contact surface of the first switch contact (7).
6. A method according to claim 5, characterised in that an electrical conductor (41) is connected in electrically conductive manner by a first end to the contact surface of the second switch contact (8), in that the second end of the electrical conductor (41) is connected in electrically conductive manner to the contact (40) of the armature (15) and in that the conductor (41) is inserted in a corresponding space in the relay (1) above the armature spring (38) and above the armature (15).
7. A relay produced by a method of claims 1 to 6.
8. A relay according to claim 7, characterised in that the magnet coil (13) is arranged in a coil block (28), in that an armature space (29) is provided between a front wall (37) and the coil block (28), in that a spring space (30) is provided between a side wall (24) and the coil block (28), in that the armature and spring spaces (29, 30) are connected together and in that an armature/spring unit (31) is inserted into the armature and spring space (29, 30).
9. A relay according to claim 8, characterised in that a terminal contact (8) is arranged beneath the spring space (30), in that an arm (22) of the yoke (11) is arranged above the terminal contact (8), in that the terminal contact (8) projects with both ends beyond the ends of the arm (22), in that one end projects out of the relay as a terminal and in that the other end comprises a contact surface, with which the spring unit is firmly connected.
10. A relay according to either one of claims 8 or 9, characterised in that an electrical conductor (41) is provided, which is connected between a second switch contact (8) and a contact (40) which is firmly connected to an armature (15).
11. A relay according to claim 10, characterised in that the electrical conductor (41) is connected to the contact surface of the terminal contact (8), and in that the electrical conductor (41) is arranged in the spring space (30) and in the armature space (29).

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