EP3575035A1 - Pneumatic working tool - Google Patents

Abstract

The invention relates to a pneumatically operated working device (1) which accommodates at least one switching element (12) inside the head housing (5), as well as having a device (13) connected to the head housing (5) for detecting and querying a position of the switching element (12) This comprises a first component (14) for detecting the at least one position of the switching element (12) and a second separate component (15) for querying the at least one position of the switching element (12). The first component (14) has detection means (16) for detecting the at least one position of the switching element (12) and the first component (14) has first electrical contact means (17) on a side facing the exterior of the head housing (5), which interact with the detection means (16). The second component (15) comprises second electrical contact means (18) which contact the first contact means (17), and output means (19) interacting with the second contact means (18), the output means (19) being the means of the detection means (16) output detected at least one position of the switching element (12).

Description

The invention relates to a pneumatically operable working device, in particular for use in the bodywork of the motor vehicle industry, with a particular double-acting cylinder, a cylinder housing, a displaceable in this piston and connected thereto, linearly displaceable and led out of the cylinder housing piston rod for actuating an arm, in particular a clamping arm or swivel arm, of the working device, wherein the region of the piston rod arranged outside the cylinder housing is arranged within a head housing of the working device and the piston rod accommodates at least one switching element within the head housing, and with a device connected to the head housing for detecting and Querying at least one position of the switching element, wherein the head housing has two interconnected housing parts and in a separation region of the two housing parts, the device is arranged.

Such implements, in which the piston rod acts on the arm via a toggle lever, in particular tensioning arm or pivoting arm, of the working device, are usually referred to as a toggle lever tensioning device or toggle lever pivoting device.

In a work tool with clamping arm this is usually the task to clamp a workpiece or an object. In the one end position of the displaceable piston, the clamping arm assumes its clamping position, while in the other end position of the piston, the clamping arm is in the open position. The piston rod can be adjustable in length, so that different opening angle of the clamping arm can be displayed by means of the implement. In this case, the same position of the switching element in the clamping position of the clamping arm and a variable depending on the selected length of the piston rod position of this switching element or another switching element by means of the device queried by the means for detecting and querying one hand.

Working tools which have a swivel arm serve the purpose of pivoting an object or workpiece connected to or attached to the swivel arm by a defined angle. Such implements can also be designed as a toggle lever device, whereby the piston rod acts on the pivot arm via a toggle lever. In one end position of the toggle lever, in which toggle lever sections essentially form a right angle to one another, the object or the workpiece is in an end position. In the opposite end position of the piston, the object or the workpiece is pivoted out of this end position. Thus, as a rule, it is not necessary to be able to adjust the swivel angle of the swivel arm, whereby only two end positions are required. For pneumatically operated implements different configurations and arrangements of means for detecting and interrogating at least one position of the switching element have been proposed.

From the EP 1 878 539 A1 It is known in a working device, a device for detecting and interrogating at least one position of a switching element, in this case a plurality of positions of the switching element, as a component form. This is inserted in total into a recess between two housing parts of a head housing and screwed from the outside to the head housing. This design of the device requires a complex assembly, because the device is used in the longitudinal extension of the implement and previously Is cylinder housing of the implement to dismantle, because the device is to be inserted from the region of the cylinder housing in the head housing. The one-piece construction of the device is also insufficient or not suitable for different series of implements.

An implement of the type mentioned, thus having the features of the preamble of claim 1 is known from EP 2 548 700 A1 known. In this case, the device for detecting and interrogating at least one position of the switching element is designed in two parts. The device has a disposed within the head housing mechanical component, which is displaceable under the action of the piston rod-side switching element. In accordance with the displacement position of the component, this cooperates with optical sensors of a further part of the device for detecting and interrogating, which is arranged outside the head housing and screwed thereto. Incidentally, this working device has been sold extensively by the Applicant and has several electrical displays and an electrical connection for an electrical device for querying the at least one position of the switching element. Thus, at least one or both end positions of the piston rod can be detected and displayed directly on the implement and / or the external device.

Object of the present invention is to develop a working device of the type mentioned so that in the area of the device for detecting and querying a significant simplification in terms of design and installation is recorded and beyond with respect to different series an effective standardization is possible.

The object is achieved by a working device, which is designed according to the features of claim 1.

In the implement it is provided that the means for detecting and interrogating a first component for detecting the at least one position of the switching element and a second separate component for interrogating the at least a position of the switching element, wherein the first component is mounted in the two housing parts between them, and the first component on a side facing an interior of the head housing detecting means for detecting the at least one position of the switching element and the first component on an exterior of the Head housing side facing first electrical contact means which cooperate with the detection means, wherein the second component is arranged in the region of the exterior of the head housing side facing and connected to the head housing, and the second component second electrical contact means which contact the first contact means, and having output means cooperating with the second contact means, the output means outputting the detected by means of the detection means at least one position of the switching element.

In this working device thus takes place a functional separation of the means for detecting and interrogating at least one position of the switching element in the two components, namely first component and second component. In this case, the first component is used to detect at least one position of the switching element, whereas the second component is used to interrogate at least one position of the switching element. The two components interact exclusively via the contact means associated therewith, thus the first electrical contact means and the second electrical contact means. Because of this functional separation of the means for detecting and interrogating at least one position of the switching element, a single second component can be used for the entire production range of different pneumatically operable implements. This allows a significant reduction of stock and the reduction of spare parts. Concerning this second component, only the same spare part is to be stocked.

Since the second component is positioned in the region of the outside of the head housing, it can be easily attached to the head housing or disassembled with respect to the head housing.

The storage of the first component is particularly simple and safe, because it is stored in the two housing parts between them. A particularly simple design is given in this regard, when the first component is inserted into the one housing part, in particular inserted and then the two housing parts are joined together, wherein the first component is inserted into the other housing part, in particular plugged. If the two housing parts firmly connected to each other, in particular bolted together, no further fastening means for the first component for the purpose of their storage in the two housing parts are required.

The electrical contacting of the two components of the device for detecting and interrogating at least one position of the switching element is particularly advantageous when connecting the second component to the head housing already stored in the head housing first component. It is only necessary to bring the second component in its mounting position relative to the head housing. In this case, their second electrical contact means come directly into contact with the first electrical contact means of the first component. There are thus no special measures to provide for connecting the two contact means in this training.

It is provided, in particular, that the one contact means has a resilient contact spring and the other contact means has a contact plate, wherein the contact spring contacts the contact plate. The contact plate can thus be rigid, while the contact spring is yielding. Due to the resilience of the contact spring a system of contact means under bias and thus a permanently secure contact is guaranteed.

The resilient contact spring is assigned in particular to the second component. However, it is quite conceivable, but this is structurally more expensive to provide an arrangement in which the compliant contact spring of the first component is associated, thus representing the first electrical contact means.

The detection means of the first component are preferably designed as optical sensors. In particular, it is one or more sensor pairs, wherein the respective sensor pair is formed by an optical transmitter and an optical receiver.

The detection means are in particular associated with the first contact means in that region of this contact means in which the switching element connected to the piston rod is in an open position of the arm, in particular clamping arm or swivel arm. It may well be provided further detection means which detect other positions of the arm, for example, a position of the arm, which corresponds to the other end position, in particular a closed position of the clamping arm.

The second component has in particular a housing. This housing is in particular connected to two housing parts of the head housing, in particular screwed to this. The housing of the second component preferably has the second contact means on a side facing the head housing, and the dispensing means are arranged on one or more other sides.

In particular, it is provided that the output means comprise one or more electrical displays or an electrical connection for an external device. The electrical displays are, in particular, lamps, wherein in particular a lamp lights up when the switching element is in a position between a sensor pair, which is arranged at a position that the position of the switching element in the open end position of the arm, in particular Clamping arm, corresponds. The clamping arm is in a different position, thus the switching element in a deviating position, this sensor pair determines no presence of the switching element and then it lights up the other light, indicating that the arm is not in the open position or the switching element itself not in the position corresponding to this opening position. Another light can indicate, for example, whether the electrical device for detecting and interrogating at least one position of the switching element is energized or de-energized. The likewise provided electrical connection for an external device makes it possible not to query this information directly to the second component, but to supply via a line connected to the electrical connection for the purpose of query an external electrical device.

The first component is in particular designed such that it has a strip-shaped main body. Such a can be particularly easily stored in the two housing halves between them and is also functionally optimally designed under the aspect of the linear travel path of the switching element. Preferably, the base body is designed such that it receives on one side of the detection means and on one side facing away from the first contact means. This design is functionally particularly advantageous because the detection means are assigned directly to the path of movement of the switching element and the first contact means, from the outside of the head housing particularly well accessible, is assigned directly to the second contact means.

It is particularly advantageous if the base body has projections or recesses on opposite sides, which engage in recesses or projections of the housing parts that are designed to be complementary. Due to this design, a particularly simple arrangement and connection of the base body and thus the first component in the head housing can be created by a positive connection arrangement between the base body and the housing parts is accomplished.

In particular, it is provided that the main body on opposite sides of projections, in particular frustoconical projections which are used in interconnected housing parts in recesses, in particular frusto-conical recesses of the housing parts, in particular are used without play. Consequently, no independent fastening means for securing the base body and thus the first component on the head housing are required.

Rather, the base body is inserted into the one housing part of the head housing and then plugged the other housing part to the base body, wherein the two housing parts then lie against each other and it is only necessary to screw the two housing parts together.

It is particularly useful when the head housing has a passage in the separation region of the two housing parts, wherein the first contact means are arranged in the region of the passage. Accordingly, a particularly simple contacting of the first contact means with the second contact means is possible when the second component is applied to and connected to the first component.

Further features of the invention are set forth in the subclaims, the description of the figures and the figures themselves, wherein it is noted that all individual features and all combinations of individual features are essential to the invention.

In the figures, the invention is illustrated with reference to second embodiments, without being limited thereto.

Fig. 1

eine erste Ausführungsform eines pneumatisch betreibbaren Arbeitsgeräts, veranschaulicht in einer räumlichen Darstellung,

Fig. 2

das Arbeitsgerät gemäß Fig. 1, bei demontierter zweiter Komponente,

Fig. 3

eine vergrößerte Darstellung des in Fig. 2 umrandeten Teilbereichs des Kopfgehäuses mit der dort befindlichen ersten Komponente der Einrichtung zum Erfassen und Abfragen mindestens einer Stellung des Schaltelements,

Fig. 4

eine räumliche Ansicht des Arbeitsgeräts von einer anderen Seite, bei demontiertem einem Gehäuseteil des Kopfgehäuses,

Fig. 5

eine Detaildarstellung des in Fig. 4 umrandeten Bereichs der ersten Komponente der Einrichtung zum Erfassen und Abfragen mindestens einer Stellung des Schaltelements,

Fig. 6

einen Längsschnitt durch das Kopfgehäuse im Bereich der ersten Komponente,

Fig. 7

eine räumliche Ansicht des Arbeitsgeräts, bei nicht veranschaulichtem vorderen Gehäuseteil des Kopfgehäuses in einer Explosionsdarstellung bezüglich der zugeordneten ersten Komponente, veranschaulicht für eine gegenüber der Darstellung in Fig. 4 alternativen Stellung von Kolbenstange und Schaltelement,

Fig. 8

bezüglich des in Fig. 7 umrandeten Teilbereichs eine vergrößerte Darstellung der zweiten Komponente im Bereich deren Kontaktmittel,

Fig. 9

eine Seitenansicht des Arbeitsgeräts, bei abgenommenem vorderem Gehäuseteil des Kopfgehäuses, veranschaulicht in einer Stellung der Kolbenstange gemäß Fig. 7,

Fig. 10

in einer räumlichen Ansicht die erste Komponente,

Fig. 11

bezüglich des umrandeten Bereichs gemäß Fig. 10 eine vergrößerte Darstellung des Teilbereichs des unteren Endes der ersten Komponente,

Fig. 12

die erste Komponente in einer gegenüber der Blickrichtung gemäß Fig. 10 entgegengesetzten Blickrichtung gesehen,

Fig. 13

die zweite Komponente in einer räumlichen Ansicht,

Fig. 14

den in Fig. 13 gekennzeichneten Teilbereich in einer vergrößerten Darstellung,

Fig. 15

einen Schnitt durch die zweiten elektrischen Kontaktmittel, die als nachgiebige Kontaktfedern ausgebildet sind, veranschaulicht in einer entspannten Position der Kontaktfeder und einer eingeschwenkten Kontaktposition der Kontaktfeder,

Fig. 16

eine Ansicht XVI gemäß Fig. 15,

Fig. 17

die Einrichtung zum Erfassen und Abfragen mindestens einer Stellung des Schaltelements, somit die beiden Komponenten, veranschaulicht in einem Mittellängsschnitt,

Fig. 18

betreffend den markierten Bereich in Fig. 17 eine vergrößerte Darstellung dieses Teilbereichs,

Fig. 19

die Einrichtung zum Erfassen und Abfragen mindestens einer Stellung des Schaltelements bei einem gemäß einem zweiten Ausführungsbeispiel ausgebildeten Arbeitsgerät, veranschaulicht in einer Explosionsdarstellung, wobei die ersten Kontaktmittel als Kontaktfedern und die zweiten Kontaktmittel als Kontaktplatte ausgebildet sind,

Fig. 20

die Anordnung gemäß Fig. 19, gesehen in einer entgegengesetzten Blickrichtung.

It shows:

Fig. 1

A first embodiment of a pneumatically operable implement, illustrated in a spatial representation,

Fig. 2

the implement according to Fig. 1 , with disassembled second component,

Fig. 3

an enlarged view of the in Fig. 2 bordered portion of the head housing with the there located first component of the device for detecting and interrogating at least one position of the switching element,

Fig. 4

a spatial view of the working device from another side, with a dismantled housing part of the head housing,

Fig. 5

a detailed representation of the in Fig. 4 framed area of the first component of the device for detecting and interrogating at least one position of the switching element,

Fig. 6

a longitudinal section through the head housing in the region of the first component,

Fig. 7

a spatial view of the working device, with not illustrated front housing part of the head housing in an exploded view with respect to the associated first component, illustrated for a comparison with the representation in Fig. 4 alternative position of piston rod and switching element,

Fig. 8

regarding the in Fig. 7 bordered portion of an enlarged view of the second component in the area of their contact means,

Fig. 9

a side view of the working device, with removed front housing part of the head housing, illustrated in a position of the piston rod according to Fig. 7 .

Fig. 10

in a spatial view the first component,

Fig. 11

with respect to the bordered area according to Fig. 10 an enlarged view of the portion of the lower end of the first component,

Fig. 12

the first component in a respect to the viewing direction according to Fig. 10 seen opposite direction,

Fig. 13

the second component in a spatial view,

Fig. 14

the in Fig. 13 marked portion in an enlarged view,

Fig. 15

3 a section through the second electrical contact means, which are designed as resilient contact springs, illustrated in a relaxed position of the contact spring and a pivoted-in contact position of the contact spring,

Fig. 16

a view XVI according to Fig. 15 .

Fig. 17

the device for detecting and interrogating at least one position of the switching element, thus the two components, illustrated in a central longitudinal section,

Fig. 18

concerning the marked area in Fig. 17 an enlarged view of this section,

Fig. 19

the device for detecting and interrogating at least one position of the switching element in a working device designed according to a second embodiment, illustrated in an exploded view, wherein the first contact means are formed as contact springs and the second contact means as a contact plate,

Fig. 20

the arrangement according to Fig. 19 seen in an opposite direction.

figure description

A pneumatically operated implement 1 is used in particular in the bodywork of the motor vehicle industry. The working device 1 has a double-acting cylinder 2. This has a cylinder housing 3, a displaceable in this, not shown piston and connected to the piston, linearly displaceable and led out of the cylinder housing 3 piston rod 4 for actuating an unillustrated arm of the implement 1 on. The outside of the cylinder housing 3 arranged region of the piston rod 4 is disposed within a head housing 5 of the implement 1. In the region of its end facing away from the piston, the piston rod 4 is pivotally connected to a toggle lever 6, the other end is rotatably connected to an output shaft 7. This is pivotally mounted in the region of the opposite ends in two housing parts 8 and 9 forming the head housing 5, wherein these ends of the output shaft 7 protrude out of the head housing 5 and have a polygonal profile there. In this area, the arm, in this case clamping arm or swivel arm, rotatably and axially fixed in the output shaft 7 is mounted. The two housing parts 8, 9 have in areas facing each other two-dimensional recordings 10, in the area of which the implement 1 is mounted in particular on a robot arm. In the area of the receptacles 10 arranged threaded bores 11 are used to screw the implement 1 with the robot arm.

The piston rod 4 accommodates a switching element 12 within the head housing 5. This is linearly moved in accordance with the retraction and extension movement of the piston rod 4. The switching element 12 is formed as perpendicular to the longitudinal axis of the piston rod 4 extending, oriented by the piston rod 4 in the direction of the receptacles 4 flag.

The working device 1 has a device 13 connected to the head housing 5 for detecting and interrogating at least one position of the switching element 12, specifically for detecting two end positions of the switching element 12. This device 13 is arranged in a separation region of the two housing parts 8, 9, thus where the head housing 5 is divided.

The device 13 has a first component 14 for detecting the two end positions of the switching element 12 and a second, separate component 15 for interrogating these two positions of the switching element 12. Here, the first component 14 is mounted in the two housing parts 8, 9 between them. Furthermore, the first component 14 on a side facing an interior of the head housing 4 detecting means 16 for detecting the two mentioned positions of the switching element 12. The first component 14 also has on a side facing the exterior of the head housing 5 side first electrical contact means 17, which cooperate with the detection means 16, on. The second component 15 is arranged in the region of the exterior of the head housing 5 facing side and connected to the head housing 5, specifically with the two housing parts 8 and 9. The second component 15 has second electrical contact means 18 which contact the first contact means 17 and output means 19 cooperating with the second contact means 18. The output means 19 output the detected by means of the detection means 16 positions of the switching element 12.

The first component 14 has a strip-shaped main body 20. This takes on one side of the detection means 16 and on the side facing away from this side, the first contact means 17. The main body 20 has on opposite sides projections 21, wherein two projections 21 are aligned with each other. The projections 21 engage in complementary designed recesses 22 of the housing parts 8 and 9 a. Specifically, two projections 21 arranged on one side of the main body 20 engage in two recesses 22 of one housing part 8 and two projections 21 arranged on the other side of the main body 20 in two recesses 22 of the other housing part 9. The projections 21 and recesses 22 are frustoconical. Before mounting the head housing 5, thus the screwing together of the housing parts 8 and 9, the base body 20 is inserted with its arranged on one side two projections 21 in the two associated recesses 22 of the housing part 8 and then the two housing parts 8 and 9 abutting each other wherein the protrusions 21 of the base body 20 located on the other side engage in the facing recesses 22 of the other housing part 9. In this state, the two housing parts 8, 9 are screwed together.

The detection means 16 are designed as optical sensors. Specifically, two sensor pairs 23, 24 are provided, wherein the respective sensor pair is formed by an optical transmitter 25 and an optical receiver 26. Light is directed from the optical transmitter 25 to the optical receiver 26. If the movable switching element 12 interrupts the light beam, this is detected by the first component 14 and this information is forwarded to the second component 15.

The head housing 5 has a passage 27 in the separation area of the two housing parts 8, 9. In the region of the passage 27, the first contact means 17 are arranged.

The second component 15 has a housing 28. This is bolted to the two housing parts 8, 9. The housing 28 accommodates the second contact means 18 on the side facing the head housing 5 and the dispensing means 19 are arranged on the side of the housing 28 facing away from this side. The output means 19 comprise a plurality of electrical displays, in particular three electrical displays 29 and an electrical connection 30 for an external device. The three displays 29 are those which have the state "current applied", Indicate "arm in one end position" and "arm in the other end position", these two end positions in a clamping arm denote its opening and closing position and denote a Schwenkarm whose two Schwenkendpositionen. The electrical connection 30 can be connected to an external device so that the queried positions of the switching element can be additionally displayed there.

In the in the Fig. 1 to 18 described embodiment, the first contact means 17 a rigid contact plate 31 with a plurality of contacts 34 and the second contact means 18 compliant contact springs 32 which contact the contacts 34 of the contact plate 31 under spring bias when the second component 15 is bolted to the head housing 5. The attachment is effected by means of two screws 33 which pass through the housing 28 and are screwed into the housing parts 8, 9.

The implement 1 according to the in the FIGS. 19 and 20 illustrated second embodiment differs from the first embodiment only in that the first contact means 17 as contact springs 32 and the second contact means 18 are formed as a rigid contact plate 31 with the contacts 34. Thus, the main body 20, the contact springs 32 and the housing 28, the contacts 34 assigned.

For reasons of optimal oxidation resistance, the contact surfaces of the contact springs 32 and contacts 34 are preferably gold plated.

By using an additional seal between the housing 28 and the head housing 5 and / or an additional seal between the two components 14 and 15 can be in the implement 1, the protection class IP 65 represent.

LIST OF REFERENCE NUMBERS

1

implement

2

cylinder

3

cylinder housing

4

piston rod

5

head case

6

toggle

7

output shaft

8th

housing part

9

housing part

10

admission

11

threaded hole

12

switching element

13

Facility

14

first component

15

second component

16

detection means

17

first contact agent

18

second contact means

19

output means

20

body

21

head Start

22

return

23

sensor pair

24

sensor pair

25

optical transmitter

26

optical receiver

27

passage

28

casing

29

electrical indicator

30

electrical connection

31

contact plate

32

contact spring

33

screw

34

Contact

Claims (14)

Pneumatically operable implement (1), in particular for use in the bodywork of the motor vehicle industry, with a particular double-acting cylinder (2), a cylinder housing (3), a displaceable in this piston and connected to this, linearly displaceable and from the Cylinder housing (3) led out piston rod (4) for actuating an arm, in particular clamping arm or pivot arm of the working device, wherein the outside of the cylinder housing (3) arranged region of the piston rod (4) within a head housing (5) of the working device (1) is arranged and the piston rod (4) accommodates at least one switching element (12) within the head housing (5), and means (13) connected to the head housing (5) for detecting and interrogating at least one position of the switching element (12), the head housing (5) has two interconnected housing parts (8, 9) and in a separation region of the two housing part e) (8, 9) the device (13) is arranged, characterized in that the means (13) for detecting and interrogating a first component (14) for detecting the at least one position of the switching element (12) and a second separate component ( 15) for interrogating the at least one position of the switching element (12), wherein the first component (14) in the two housing parts (8, 9) is mounted between them, and the first component (14) on a one inside of the head housing ( 5) facing side detecting means (16) for detecting the at least one position of the switching element (12) and the first component (14) on a side facing the exterior of the head housing (5) side first electrical contact means (17) connected to the detection means (16). 16) cooperate, wherein the second component (15) in the region of the exterior of the head housing (5) facing side and is connected to the head housing (5), and the second Kompo second (15) comprises second electrical contact means (18) contacting the first contact means (17) and cooperating with the second contact means (18) Output means (19), wherein the output means (19) output by means of the detection means (16) output at least one position of the switching element (12). Tool according to claim 1, characterized in that the first component (14) has a strip-shaped main body (20). Tool according to claim 2, characterized in that the base body (20) on one side of the detection means (16) and on one side facing away from the first contact means (17) receives. Tool according to claim 2 or 3, characterized in that the base body (20) on opposite sides projections (21) or recesses, which engage in complementary designed recesses (22) or projections of the housing parts (8, 9). Working tool according to claim 4, characterized in that the base body (20) on opposite sides projections (21), in particular frusto-conical projections (21) which in interconnected housing parts (8, 9) in recesses (22), in particular frusto-conical recesses ( 22) of the housing parts (8, 9) are used, in particular are used without play. Implement according to one of claims 1 to 5, characterized in that the detection means (16) are designed as optical sensors. Working tool according to claim 6, characterized in that one or more sensor pairs (23, 24) are provided, wherein the respective sensor pair (23 or 24) by an optical transmitter (25) and an optical receiver (26) is formed. Tool according to one of claims 1 to 7, characterized in that the head housing (5) in the separation region of the two housing parts (8, 9) has a passage (27), wherein in the region of the passage (27), the first contact means (17) are. Implement according to one of claims 1 to 8, characterized in that the second component (15) has a housing (28). Working tool according to claim 9, characterized in that the second component (15), in particular the housing (28), with two housing parts (8, 9) connected, in particular screwed to these. Working device according to claim 9 or 10, characterized in that the housing (28) on a side facing the head housing (5) side receives the second contact means (18) and the output means (19) are arranged on one or more other pages. Implement according to one of claims 1 to 11, characterized in that the output means (19) one or more electrical displays (29) or an electrical connection (30) for an external device. Working tool according to one of claims 1 to 12, characterized in that by means of the output means (19) a first or second state of the arm, in particular two end positions of the arm can be displayed, in particular additionally displayed, whether the means (13) for detecting and Queries is energized. Working tool according to one of claims 1 to 13, characterized in that the one contact means (17 or 18) at least one compliant contact spring (32) and the other contact means (18 or 17) has a contact plate which is provided with at least one contact, wherein the respective contact spring (32) makes contact with the contact plate (31).

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