EP0887819A2 - Electric push-button switch - Google Patents

Abstract

An electrical key switch comprises a housing (11) in which a contact unit (27) having switching elements (26) is arranged, and at least one automatically resetting and off-center key (10) with a switching plunger (29) acting on the switching elements (26) . With the pushbutton switch (9), damage or destruction of the switching elements (26) is to be prevented even under greater loads. For this purpose, the contact unit (27) is resiliently mounted in the housing (11) and resilient against excessive force application by the switching plunger (29) on the switching elements (26), wherein between the contact unit (27) and the base (20) of the housing (11) a spring unit (60) is arranged.

Description

The invention relates to an electrical key switch with a housing in which a switching elements Contact unit is arranged, and at least one automatically resetting and off-center Button with one acting on the switching elements Switch plunger.

Such an electrical device is known from DE 195 11 878 A1 Key switch known. This is with a switching elements receiving housing and several self-resetting as well as off-center keys with one each the switching tappets acting on the switching elements. Each key has one with two opposing operating surfaces provided actuation bead on the approximately is aligned axially parallel to the key bearing. The one on the Side of the key bearing introduced approximately parallel to the housing Actuating force has the same direction of action on the Button like the one on the opposite side is roughly vertical actuating force introduced to the housing. The housing of the electric key switch is fixed to the steering wheel connected to a motor vehicle, the actuating surfaces the buttons through an aperture in the steering wheel hub project through the surrounding steering wheel bowl. Such a electric key switch is particularly suitable for triggering of switching functions, such as for temporary Speed control (cruise control) of the motor vehicle and / or to control the operating functions of an Vehicle housed radio cassette unit. In the housing a circuit board designed as a contact unit is accommodated, the one spring unit attached to the housing assigned. By pressing a button, the Switch plunger on the spring unit and connects or interrupts Current paths on the circuit board. The circuit board itself is rigidly attached to the interior of the housing. Become frequent such circuit boards with switching elements, in particular with microswitches, through which the switching and Operating functions are triggered. Such microswitches are very inexpensive to manufacture and easy to use. However, they have the disadvantage that they are created an overload, namely by actuating the associated Key are often destroyed or damaged and thus the electric key switch becomes unusable.

It is an object of the invention to provide an electrical key switch to create the type mentioned, in which a Damage or destruction of the switching elements also greater load or in the event of an overstroke of the actuating element is prevented.

According to the invention the object is achieved in that the Contact unit resiliently mounted in the housing and against excessive Force applied by the switching plunger to the switching elements is compliant. Here is preferably between the contact unit and the base of the housing a spring unit arranged. By exerting a force on the keys of the electric key switch are the switching elements operated safely and yet protected against overload. Due to the resilient mounting of the contact unit in the The housing creates an elastic overstroke that is sufficient to resist increased pressure on the button. The for the intended use of the electrical Switch elements provided on the contact unit have a certain switch-over strength or a resistance to pressure. At the Actuation of the switching element by applying a force the associated key acts on the switching element until whose end stop has been reached. When exercising a larger one Pushing force on the button would normally be the switching element destroyed or at least damaged. Between the contact unit and the base of the housing Spring unit is installed, which as a leaf spring, as at the Housing molded spring or the like is formed can absorb the excessive force. At this force attack is the compression of the leaf spring triggered and the overload of the button pressed absorbed, so that only a partial force on the associated switching element works. So that the switching element is effective against excessive attack protected.

According to a development of the invention, the contact unit by means of clamping elements formed on the housing with a Clearance kept against the base of the housing. The contact unit is thus secured in the housing, however, when the button is pressed, it can move a certain amount Overstroke in the direction of the housing base against the resistance the spring unit can be moved.

The contact unit is preferably designed as a printed circuit board, while the switching elements of the contact unit microswitch, Are jumpers or the like. Especially are suitable due to the high functionality and the microswitches are easy and inexpensive to manufacture.

According to an advantageous embodiment, the key and the base of the housing on the one hand by key bearings and on the other hand by at least one that has a movement play Clip device connected together. The key bearing causes the button to pivot by a certain amount Axis while the clipping device pivots button is limited by a predetermined range.

To automatically reset the button after you press it to effect this is against the contact unit spring loaded. The key preferably has in its cavity one from the housing inner wall perpendicular to the contact unit protruding pin loaded with a compression spring. This causes the key to be reset. When you release the button the compression spring on the pin relaxes and pushes the button back to its original position.

According to a development of the invention, the button has a with two opposing operating surfaces Actuator bead, which is essentially axially parallel is directed to the key bearing. This has on the side of the key bearing approximately parallel to the operating force exerted the same direction of action on the button as the one on the opposite side is approximately perpendicular to the housing exerted operating force. This makes it very easy to use achieved, which enables the electrical Operate pushbuttons from different directions. As a result, no complex deflection gears are required, the direction of the actuating forces on the direction of action to adjust the button, which is extremely cost-effective.

In an advantageous embodiment of the invention, the key switch such as in the area of a steering wheel of a motor vehicle attached that one encompassing the steering wheel of the steering wheel Hand with her thumb on one operating surface and with your finger on the other operating surface the button can act. The hand can move around of the steering wheel on the steering wheel. The right thing The required actuation force is then dosed very easily possible. Analogous to the possibilities of the natural Movement of the fingers or thumb becomes the actuating force initiated, when pressing the push button the handle around the steering rim cannot be released got to. Rather, there is a tighter encirclement of the steering wheel by the finger or Thumb.

To take into account the physical circumstances the alignment of the joints of the fingers and the thumb correspond, according to an advantageous development of the Key switch this assigned to the steering wheel that the bead of the button behind the steering wheel approximately runs parallel and recessed on the steering rim. This ensures an optimal assignment of the button to the fingers or the thumb.

In a further embodiment of the solution according to the invention the housing is firmly connected to the steering wheel, whereby the operating surfaces of the button through an aperture in project through a steering wheel bowl surrounding the steering wheel hub and no steering wheel spokes in the area of the button are provided. When pressing the button switch lie the fingers and thumb in relation to the control surfaces always opposite. Will that be led by the hands When the steering wheel is turned, the button turns at the same angle With. But even in critical situations, the operation is button without taking your hand off the steering wheel. In addition, there is always a clear view of the button ensured.

Furthermore, it preferably has an operator facing Actuation area of the button a symbol area, which is indicated by a light element arranged below the key illuminates becomes. Especially at night and also in a phase in an operator gets used to a key combination must, or an operator inexperienced in the combination Holding the steering wheel in hand is done by displaying and illuminating the symbol area for the switching functions Mishandling excluded.

For the full light intensity on the symbol area of the button to steer and shield their surroundings from the effects of light, the button has in its cavity on its housing inner wall one from the light element of the contact unit towards the symbol surface. Conveniently the length of the light guide channel is such that this with excessive force attack with its front end hits the base of the housing. This also becomes a Overtravel and thus excessive force application of the button the associated switching element prevented.

The pushbutton switch attached to the steering wheel preferably also has at least three keys arranged side by side on. Thus, several switching functions on one electrical Push button switches can be realized.

Furthermore, the middle or the outer keys have sealing collars on their side walls facing each other, the gap between the adjacent keys bridge. The sealing collars prevent penetration of dirt in the push button. In addition, that will prevents unwanted radiation of light from that in the Housing existing light element goes out.

The key bearing for each key preferably consists of at least one bearing bracket with bearing journal fixed to the housing and a corresponding opening in the side wall the button. In alternative training, however, there is Key bearings for each key from at least one fixed to the housing Bearing bracket and one formed on the side wall of the button Bearing journal, which in a corresponding Opening of the bearing bracket engages.

To the available space on the steering wheel of the steering wheel above all between two steering wheel spokes and to take advantage of to be able to implement many switching functions advantageous in the area of the steering wheel of the motor vehicle two diametrically opposed pushbuttons arranged. This allows the buttons of each key switch and the Switching elements of the contact unit with different Switching functions are assigned. So it is possible that Keys of each key switch and the switching elements of the contact unit with switching functions for controlling an im Motor vehicle radio and / or cassette player and / or CD player and / or CD changer device occupy.

It is understood that the above and below Features to be explained not only in each case specified combination, but also in other combinations or can be used alone without the To leave the scope of the present invention.

Fig. 1

eine Ansicht auf das Lenkrad eines Kraftfahrzeuges mit erfindungsgemäßen elektrischen Tastschaltern,

Fig. 2

einen Schnitt durch das Lenkrad gemäß Fig. 1 entlang der Linie II-II,

Fig. 3

eine Ansicht auf das Lenkrad gemäß Fig. 1 in Richtung des Pfeiles III mit ausgebrochenem Lenkkranz,

Fig. 4

eine perspektivische Ansicht auf eine aus elektrischen Tastschaltern nach der Erfindung zusammengesetzte Schaltereinheit,

Fig. 5

eine Schnittansicht durch einen unbetätigten elektrischen Tastschalter entlang der Linie V-V nach Fig. 7,

Fig. 6

eine Schnittansicht durch den elektrischen Tastschalter entlang der Linie VI-VI nach Fig. 10,

Fig. 7

eine Draufansicht des elektrischen Tastschalters in Richtung des Pfeiles VII nach Fig. 4 und

Fig. 8

eine Draufansicht des elektrischen Tastschalters in Richtung des Pfeiles VIII nach Fig. 4.

Fig. 9

eine Ansicht des elektrischen Tastschalters in Richtung des Pfeiles IX nach Fig. 4,

Fig. 10

eine Ansicht auf den elektrischen Tastschalter ohne Darstellung der Tasten,

The idea on which the invention is based is explained in more detail in the following description using an exemplary embodiment which is illustrated in the drawing. It shows:

Fig. 1

2 shows a view of the steering wheel of a motor vehicle with electrical push buttons according to the invention,

Fig. 2

2 shows a section through the steering wheel according to FIG. 1 along the line II-II,

Fig. 3

1 in the direction of arrow III with the steering wheel broken out,

Fig. 4

2 shows a perspective view of a switch unit composed of electrical pushbutton switches according to the invention,

Fig. 5

7 shows a sectional view through an unactuated electrical pushbutton switch along the line VV according to FIG. 7,

Fig. 6

10 shows a sectional view through the electrical pushbutton switch along the line VI-VI according to FIG. 10,

Fig. 7

a plan view of the electric key switch in the direction of arrow VII of FIG. 4 and

Fig. 8

a plan view of the electrical pushbutton switch in the direction of arrow VIII of FIG. 4th

Fig. 9

3 shows a view of the electrical pushbutton switch in the direction of arrow IX according to FIG. 4,

Fig. 10

a view of the electrical key switch without showing the keys,

1 to 3, a steering wheel 1 is shown, the one Switch unit 2 is assigned. Behind the steering wheel 1 is the steering column 3, in which the steering column 4 is mounted, at the end of which the steering wheel 1 is located. Concentric to Steering wheel 1, the steering wheel hub 5 is arranged, the steering wheel bowl 6 surrounds. The steering wheel bowl 6 takes the airbag, the horn contact and an electrical connection system on, through which the contact from the rotating steering wheel 1 to fixed steering column 3 is transmitted. The steering wheel 1 has a steering rim 7, the steering wheel spokes 8 with the steering wheel bowl 6 surrounding the steering wheel hub 5 is. The switch unit 2, which is in the steering wheel bowl 6 is arranged, consists of two pushbuttons 9, one of which one is arranged on each side of the steering wheel 1. Everyone the key switch 9 has three keys 10, which are side by side and are arranged visible from the operator.

4 has an approximately rectangular shape Housing 11 with narrow sides 12 and long sides 13 on. At opposite corners of the housing 11 between a narrow side 12 and a long side 13 a mounting flange 14 with a recessed mounting hole 15 molded. For stiffening the mounting flange 14 there is a strut 16 between the mounting flange 14 and the narrow side 12. The housing 11 is 17 wider at its base than the buttons 10. Furthermore, there is a connection 18 on the housing wall 19 trained and merges into a base 20. The base 20 does not cover the entire opening at the base 17 of the housing 11 onwards. Electrical lead through a recessed free space 21 Lines 22 to terminal 18 through. For every key 10 two bearing brackets 23 are molded onto the base 20. The Bearing tabs 23 form key bearings 24 which are eccentric Housing 11 lie. The two available for a 10 button Bearing brackets 23 (FIG. 9) are spaced apart from one another as far as that they also guide the key 10 axially. On the inside 25 of the base 20 there are switching elements 26, that for both electrical and mechanical Switch are provided. The trained as a microswitch Switching elements 26 are arranged on a contact unit 27. The key 10 has on the opposite of the housing 11 Side of a key cavity that is surrounded by a Switch plunger 29 molded onto a key wall 28 is penetrated.

Each key 10 has an actuating bead 30 which is approximately aligned axially parallel to the key bearing 24 and is spaced from this. On both sides of the key edge 31 to the actuating bead 30 extending surfaces the actuating surfaces 32 and 33. the actuating surfaces 32 and 33 run approximately like the actuating bead 30 axially parallel to the key bearing 24. Perpendicular to the key bearing 24 and starting from the circumferential key edge 31 project vertically to the actuating surfaces 32 and 33 key legs 34 in front. A bearing flange closes on each key leg 34 35 in which a flange bore 36 is inserted is. A journal 37 fastened to the bearing bracket 23 protrudes into the flange bore 36. Between the key edge 31 and the housing top 38 is a gap 39. Die housing-fixed bearing bracket 23 is so high that the key bearing 24 is approximately at the height of the gap 39 located. In the immediate vicinity is the interior of the button 10 formed a reinforcement wall 40. The push buttons 9 are attached to the steering wheel 1 so that the thumb 41 initiated operating force 42 on the key bearing 24 acts opposite operating surface 32, approximately perpendicular to the housing 11. The of the Fingers 43 initiated operating force 44 acts on the Actuating surface 33, which is on the side of the key bearing 24 is located and from the key edge 31 to the actuation bead 30 extends. The extension of the operating area 32 goes from the key edge 31 to the actuation bead 30, but opposite the operating surface 33. The arrangement the actuating surfaces 32 and 33 with the in between arranged actuation bead 30 is approximately V-shaped, wherein However, the actuating bead 30 off-center on the Key 10 is located more in the direction of the key bearing 24.

About the mounting flanges 14, the housing 11 of the Key switch 9 attached in the area of the steering wheel 1. The Attachment takes place so that the steering ring 7 encompassing Hand with her fingers 43 in front of the operating surface 33 and the thumb 41 lies in front of the actuating surface 32 and thus the actuating force 42 or 44 can be initiated. The most favorable arrangement is when the actuating bead 30 approximately parallel to the steering rim 7 on the Height of the rear 45 of the steering wheel 7 is present. The backside 45 of the steering collar 7 is the one facing away from the operator Steering wheel side 1.

The housing 11 is firmly connected to the steering wheel 1. Consequently the button switch 9 rotates with the steering wheel 1. The Steering wheel 1 is in the region of its steering wheel hub 5 Steering wheel bowl 6 surrounded, which also with the steering wheel 1 turns. In the steering wheel bowl 6 is an aperture hole 46, which is only so large that the buttons 10 of the Key switch 9 with their actuating surfaces 32 and 33 and her actuating bead 30 protrude therethrough and freely movable are. The steering wheel bowl 6 also covers the Buttons 10 protruding area of the housing 11 with the mounting flanges 14 arranged thereon. The attachment of the switch 9 on the steering wheel 1 is always on a place where there are no steering wheel spokes 8 in front of the buttons 10 of the key switch 9 lie.

As can be seen from FIG. 1, the steering wheel 1 has a total four steering wheel spokes 8. The distance between two Steering wheel spokes 8 is designed so that the buttons 10 of the Key switch 9 directly between the two steering wheel spokes 8 look through. This gives the operator free Insight into the keys 10 or the operating areas 32. There is a symbol 47 on each of the actuating surfaces 32 applied that an indication of the function of the associated Button 10 there. So that the operator even in the dark Note on the function of key 10 receives is how 7 and 8, in the actuating surface 32nd button 10 has a translucent symbol surface 48. As can be seen in particular from FIGS. 7 and 8 each symbol 47 has a specific function, in the exemplary embodiment related to a radio cassette unit, assigned, namely, for example, station / track search functions according to the button switch 9 of FIG. 7 or volume / switching functions according to the key switch 9 according to FIG. 8. Inside the key switch 9 is on the contact unit according to FIG. 5 27, a lighting element 49 in the form of an LED is applied. If the luminous element 49 is activated, it radiates the light also through the symbol area 48 in the button 10. In the unlit state of the button 10, the recognition the switching function by on the actuating surfaces 32 and 33 applied tactile symbols (not shown). In the interior of the button 10 is a light guide channel 50 in the form of a tube with a square cross section, by the light emitted by the lighting element 49 to the symbol area 48 on the actuation area 33 of the key 10 is directed.

A pin 51 protrudes from the light guide channel 50, which is from the housing inner wall, for example in the transition area from the actuating bead 30 to the actuating surface 32, perpendicular extends to the contact unit 27. This pin 51 is about arranged in the center of the key 10 cavity. Circumferential this is provided with stiffeners 52, which are almost extend over its entire length. The free end 53 of the Pin 51 is surrounded by a compression spring 54, which is on the one hand on the stiffener 52 and on the other hand on the Top of the contact unit 27 supports. At pin 51 is 6, a web 55 is integrally formed with the switching plunger 29 is connected. As a result, the switching plunger 29 is stabilized in position held. On the base 20 of the housing 11 and corresponding to this on each of the buttons 10 are clip connections 56 trained, namely opposite the Side on which the key bearings 24 are located. The Clip connection 56 has such a high clearance that the Key 10 around the key bearing 24 can be operated.

On the base 20 of the housing 11 is a contact unit 27 a circuit board 57 is arranged. Over several on their scope distributed and integrally formed with the housing 11 Clamping elements 58 make the circuit board 57 movable held (Fig. 10). Between the bottom of the circuit board 57 and the top of the base 20 of the housing 11 a spring unit 60 designed as a leaf spring 59 is arranged.

By exerting an actuating force 42 or 44 by the Thumb 51 or fingers 43 on the actuating surfaces 32 or 33 of the button 10, the switching plunger 29 presses the as Microswitch trained switching element 26 on the Printed circuit board 57 are arranged. If there is a larger one Exerting force, the circuit board 57 will continue to counter the spring action of the leaf spring 59 pressed and gives thus within the limits of the clamping elements 58. Here different switching functions through the microswitch triggered. Via lines 23, which follow 18 of the housing 11 fixed by means of a bracket 61 are, the electrical impulses via further connecting lines 63 and the attached connector 64 transmitted to the vehicle electrical system.

When the button 10 is released, the is released Leaf spring 59 relieves the circuit board 57, which thereby returns to its starting position. At the same time the circuit board 57 exerts pressure on the compression spring 54 which pushes back the associated pin 51, and thereby inevitably the key 10 in its initial position is moved back.

6 is on the side of the middle key on the key wall 28 a sealing collar 63 is formed, which in a corresponding recess 64 of the adjacent outer key 10 protrudes. There is a between the adjacent keys 10 Gap 65 formed to rub against the adjacent one Avoid buttons 10. Through the sealing collars 63 on the middle button, column 65 is covered, so that on the one hand, no dirt into the interior of the pushbutton switch 9 arrive and on the other hand generated by the lighting element 49 Light cannot escape.

List of reference numbers

1

steering wheel

2nd

Switch unit

3rd

Steering column

4th

Steering column

5

Steering wheel hub

6

Steering wheel bowl

7

Steering wheel

8th

Steering wheel spoke

9

Push button

10th

button

11

casing

12th

Narrow side

13

Long side

14

Mounting flange

15

Mounting hole

16

strut

17th

Base

18th

Connection

19th

Housing wall

20th

base

21

free space

22

management

23

Bearing bracket

24th

Key bearings

25th

inside

26

Switching element

27

Contact unit

28

Keyboard wall

29

Switch plunger

30th

Actuation bead

31

Key edge

32

Operating area

33

Operating area

34

Key leg

35

Bearing flange

36

Flange bore

37

Bearing journal

38

Top of the housing

39

gap

40

Reinforcement wall

41

thumb

42

Operating force

43

finger

44

Operating force

45

back

46

Aperture hole

47

symbol

48

Icon area

49

Lighting element

50

Fiber optic channel

51

pen

52

stiffening

53

The End

54

Compression spring

55

web

56

Clip connection

57

Circuit board

58

Clamping element

59

Leaf spring

60

Spring unit

61

Bracket

62

Connecting cable

63

Federation

64

Recess

65

gap

Claims (24)

Electrical pushbutton switch with a housing (11) in which a contact unit (27) having switching elements (26) is arranged, and at least one automatically resetting and off-center button (10) with a switching plunger (29) acting on the switching elements (26), characterized in that the contact unit (27) is resiliently mounted in the housing (11) and is flexible against excessive force application by the switching plunger (29) on the switching elements (26). Electrical key switch according to claim 1, characterized in that a spring unit (60) is arranged between the contact unit (27) and the base (20) of the housing (11). Electrical pushbutton switch claim 2, characterized in that the spring unit (60) is designed as a leaf spring (59), as a spring or the like molded onto the housing (11). Electrical pushbutton switch according to one of Claims 1 to 3, characterized in that the contact unit (27) is held against the base (20) of the housing (11) by means of clamping elements (58) formed on the housing (11). Electrical key switch according to one of claims 1 to 4, characterized in that the contact unit (27) is designed as a printed circuit board (57). Electrical pushbutton switch according to one of claims 1 to 5, characterized in that the switching elements (26) of the contact unit (27) are microswitches, switching bridges or the like. Electrical pushbutton switch according to one of Claims 1 to 6, characterized in that the pushbutton (10) and the base (20) of the housing (11) are connected to one another by key bearings (24) and on the other hand by at least one clip device (56) having a play in motion are. Electrical key switch according to one of claims 1 to 7, characterized in that the key (10) is spring-loaded against the contact unit (27). Electrical key switch according to Claim 8, characterized in that the key (10) in its cavity has a pin (51) which projects perpendicularly from the housing inner wall to the contact unit (27) and is loaded with a compression spring (54) and which brings about the resetting of the key (10). having. Electrical pushbutton switch according to one of Claims 1 to 9, characterized in that the pushbutton (10) has an actuating bead (30) which has two opposing actuating surfaces (32, 33) and is directed essentially axially parallel to the key bearing (24). Electrical key switch according to Claim 10, characterized in that the actuating force (44) exerted on the side of the key bearing (24) approximately parallel to the housing (11) has the same direction of action on the key (10) as that on the opposite side approximately perpendicular to Housing (11) exerted actuating force (42). Electrical pushbutton switch according to one of claims 1 to 11, characterized in that the pushbutton switch (9) is fastened in the region of a steering wheel (1) of a motor vehicle in such a way that a hand gripping the steering ring (7) of the steering wheel (1) with its thumb ( 41) on which an actuating surface (32) and with your finger (43) can act on the other actuating surface (33) of the key (10). Electrical pushbutton switch according to one of claims 1 to 12, characterized in that the pushbutton switch (9) is assigned to the steering ring (7) in such a way that the actuating bead (33) of the button (10) behind the steering ring (7) is approximately parallel and set back the steering rim (7). Electrical key switch according to one of claims 1 to 13, characterized in that the housing (11) is fixedly connected to the steering wheel (1), the actuating surfaces (32, 33) of the button (10) through an aperture hole (46) in one the steering wheel bowl (6) surrounding the steering wheel hub (5) protrude and no steering wheel spokes (8) are provided in the area of the button (10). Electrical key switch according to one of claims 1 to 14, characterized in that the actuating surface (32) of the key (10) facing an operator has a symbol surface (48) which can be illuminated by a lighting element (49) arranged below the key (10) . Electrical key switch according to one of claims 1 to 15, characterized in that the key (10) has in its cavity on its housing inner wall a light-guiding channel (50) directed from the lighting element (49) of the contact unit (27) to the symbol surface (48). Electrical pushbutton switch according to Claim 16, characterized in that the light-guiding channel (50) is of such a length that its front end abuts the base (20) of the housing (11) in the event of excessive force application. Electric key switch according to one of claims 1 to 17, characterized in that the key switch (9) attached to the steering wheel (1) has at least three keys (10) arranged next to one another. Electrical pushbutton switch according to one of Claims 1 to 18, characterized in that the middle or the outer buttons (10) have sealing collars (63) on their side walls (28) facing each other which seal the gap (65) between the adjacent buttons (10 ) bridge. Electrical key switch according to one of claims 1 to 19, characterized in that the key bearing (24) for each key (10) consists of at least one bearing bracket (23) fixed to the housing with bearing journal (37) and a corresponding flange bore (36) in the side wall ( 28) of the button (10). Electrical key switch according to one of claims 1 to 19, characterized in that the key bearing (24) for each key (10) consists of at least one bearing bracket (23) fixed to the housing and a bearing pin (37) formed on the side wall (28) of the key (10) ), which engages in a corresponding flange bore (36) of the mounting bracket (23). Electrical key switch according to one of claims 1 to 21, characterized in that two diametrically opposite key switches (9) are arranged in the region of the steering wheel (1) of the motor vehicle. Electrical key switch according to one of claims 1 to 22, characterized in that the keys (10) of each key switch (9) and the switching elements (26) of the contact unit (27) are assigned different switching functions. Electrical key switch according to claim 23, characterized in that the keys (10) of each key switch (9) and the switching elements (26) of the contact unit (27) with switching functions for controlling a radio and / or cassette player and / or located in the motor vehicle CD player and / or CD changer device are occupied.

Images