EP1467390B1 - Key-pad for the control panel of a household appliance - Google Patents

Abstract

The button block has at least one button with a cap (4) and an actuating element (5), at least one spring element and a frame (2) in which the at least one button is guided. The button cap transfers a force to the actuating element in the actuation direction via an acting surface in contact with a corresponding surface of the actuating element when operated. The cap and actuating element are not connected together, at least at their corresponding acting surfaces.

Description

The invention relates to a keypad for insertion into an operating surface of a household appliance, in particular a Cover made of glass, stainless steel, aluminum or materials with similar material properties.

The control surfaces of household appliances usually have several different controls on. Buttons for Setting certain functions individually or as Keypad arranged side by side. It should be noted, that the functional units are spatially coordinated are, so that in or attached to the housing keys and the buttons inside the electronics of the device interact smoothly.

The assembly of pushbuttons is especially for glass panels difficult as the ones feasible at competitive prices Glass processing techniques with larger manufacturing tolerances connected as, for example, metalworking techniques. Therefore, basically the use a keypad advantageous in which the control surface not needed for the functionality of the keys and accordingly does not need to be specially adapted. Farther it is desirable that the known electronics the devices and their arrangement can remain unchanged and that the keys even when larger manufacturing tolerances interact with this electronics.

The document DE 197 39 575 discloses a keypad in which are integrally formed on a flexible web pushbuttons, which are housed in openings, for example in a glass panel. Due to the flexible web, a flexible arrangement of the pushbuttons is achieved. About a trained on the pressure switch switch plunger can also operate a more distant electronics. The switch plunger is so generously dimensioned that the button is always pressed when the push button is pressed.

Due to the flexible bridge and the generously dimensioned Switch plungers can produce manufacturing tolerances to a certain extent Degree be compensated. The keys or their spring geometries however, rely on a between electronics and Aperture arranged abutment. Therefore, the keypad is not independent of the electronics or their arrangement behind the control surface.

• eine Leiterplatte mit mindestens einer Kontaktstelle,
• eine Gehäuseschale mit mindestens einem Tastendurchbruch,
• mindestens eine Taste mit mindestens einem Aktuator zur Aktivierung der Kontaktstelle, wobei die Tastenkappe der Taste und der Aktuator in einer leiterplattenparallelen Ebene gegeneinander verschiebbar sind, und
• eine zwischen der Leiterplatte du dem Aktuator angeordnete Schalteinheit mit einem der Kontaktstelle zugeordneten Schaltelement.

A mobile device according to EP 1 288 983 A2 has

• a printed circuit board with at least one contact point,
• a housing shell with at least one button opening,
• at least one key with at least one actuator for activating the contact point, wherein the key cap of the key and the actuator in a plane parallel to the board are mutually displaceable, and
• a switching unit arranged between the printed circuit board and the actuator with a switching element associated with the contact point.

It is an object of the invention to provide a keypad in which the aforementioned disadvantages in the state of Technology at least partially overcome or at least reduced become.

This task is performed by the keypad with the features of claim 1.

The keypad for insertion into a control surface of a Household appliance, in particular a panel made of glass, stainless steel, Aluminum or materials with similar material properties comprises at least one key comprising a Button cap and an actuator that between the Button cap and an electrical switching unit of the household appliance is arranged or can be arranged and when pressed the keycap with this and the electrical switching unit cooperates to trigger a switching operation, at least one spring element, which upon actuation of the button a restoring force for the reset of the key cap and a framework in which the at least one Button is performed, with the key cap when pressed on an effective surface, which acts on a corresponding effective surface the actuating element rests on the actuating element transmits a force in the actuating direction, and wherein the keycap and the actuator at least at their corresponding active surfaces not with each other are connected.

The corresponding active surfaces are those surfaces or areas on the surface of the key cap and the Actuator on which keycap and actuator upon actuation of the key cap in the direction of actuation touch. That the corresponding active surfaces not connected to each other or loose or against each other In other words, being mobile means that the keycap and the actuator physically separate units or separate components.

The main advantage of the keypad according to the invention is that through the physical separation of the units keycap and actuating element, the compensation of shape and position tolerances, For example, on manufacturing tolerances of Keypads, the control unit or the electronic Switching unit based, is enabled. The actuators can then be in the direction of actuation and / or vertically to the direction of actuation a certain game in the frame or in the key cap, thereby also a actuate a slightly offset switching element or with this can be brought into engagement.

Another advantage is that the orientation of the keycaps not in the frame by the position of the actuators being affected. This ensures that the keypad outwards always has a uniform surface having.

Another advantage is that the spring elements to provide the restoring force are formed on the button. As a result, when using the keypad according to the invention the electrical switching unit in the previous devices remain unchanged in their arrangement, since they are not needed for the functionality of the keys. Also on The control surface are no complex modifications perform.

Furthermore, the keypad according to the invention is made built very few simple parts, which he also is relatively inexpensive in the Fierstellung.

In the frame, there is a separate one for each key Guiding frame formed. The keycap is in the guide frame guided from the inside. That means the keycap enclose the guide frame and lie with areas its inner surface, in particular the inner surface of the side surfaces, at corresponding areas or areas or Points the surface of the guide frame. The guide frame prevents twisting of the keycaps in the Frame. This has the advantage of a visually appealing Appearance, as the keys are essentially standing vertically zueinender, on the other hand is the danger Damage to the keys by rubbing together and in the worst case, jamming of the keys is reduced. The keycaps have smooth outer surfaces, which in turn is advantageous from an optical point of view.

In a particularly advantageous embodiment of the keypad According to the invention, this is at least one spring element not in force communication with the actuator. The corresponding active surfaces or the separated Units therefore touch each other in an initial position the keycap or a position that the keycap occupies, if no operation, not mandatory. In other words, that means keycap and actuator can be decoupled from each other when no actuation of the key cap in the direction of actuation takes place.

The at least one spring element is preferably on the Button cap molded and rests on the frame. That's it Spring element preferably on one or more of the side surfaces the key cap molded. The frame forms then the abutment for the spring element.

It is particularly advantageous if the spring element in a starting position is biased. This will be the Keycaps pressed outwards even when not pressed and all the buttons next to each other are the same Height up. This creates a uniform surface of the keypad and a visually pleasing appearance.

In a particularly expedient embodiment, this is at least a spring element integrally formed on the key cap Strut. It can be particularly advantageous if four struts are molded to the key cap, depending two on the opposite sides of the keycap, the bordering exclusively on the frame. This embodiment is preferred for rectangular keycaps that are relative long such pages, since in this way a uniform reset of the keycaps is achieved. The struts can be diagonal to the outer corners of the Run in the middle of these pages. It is both possible that they are at the corners or in the middle of the keycap are formed on this.

Furthermore, it may be advantageous if the key cap two struts are formed, one on the opposite Pages. This construction is particularly suitable for keys with keycaps that have such short sides. It is possible that the struts this opposite sides in the same or in opposite Direction from an outer corner or the middle of this Pages are diagonal to the other outer corner.

In a particularly advantageous embodiment of the keypad According to the invention, the frame is together with the guided therein keys in a breakthrough in the control surface used or usable. The breakthrough is in its dimensions according to the dimensions of the frame dimensioned. Will the complete keypad in the Submerged user interface is the surface of the keypad almost flush with the surface of the control surface. The gives a pleasing appearance and the control surface is easy to clean.

The frame is preferably with means for attachment of the keypad in the breakthrough. For fixation in the control surface, for example, noses, Snap hooks or spring elements may be provided. Farther may be provided means, in particular noses, the serve to press the frame evenly to the surface.

It is particularly advantageous if the actuating element in the direction of actuation and / or perpendicular to the actuation direction in each case in a predetermined tolerance range the key cap is changeable in its position. Of the Tolerance range is preferably greater than that through the manufacture of the keypad conditional manufacturing tolerances. Due to the variable position or the mobility or the game of the actuator perpendicular to the direction of actuation and in the direction of actuation can then be For example, positional tolerances of the switching elements of the electrical Balance switching unit. The keycap remains while firmly in their starting position in the frame.

In a particularly advantageous embodiment of the keypad is formed on the actuating element a locking means, As latching means, for example depressions, Grooves, grooves but also noses, hooks or other elevations be provided on the fastening means. The locking means serves the fastener with the keypad or to connect to the electrical switching unit, in which it engages with corresponding locking means coming

In an advantageous embodiment, the actuating element over the locking means with corresponding connected to the electrical switching unit releasably connected. The actuator is then upon actuation of the key cap guided in the electrical switching unit. The maximum Hub of the actuator is dependent on the Verrastgeometrie or the embodiment of the corresponding Latching means.

It is particularly advantageous if the actuating element is formed at least in a section in T-shape. at lateral actuation of the button are then on the T-profile the pressure forces in the middle derived. This is especially when using elongated, rectangular Keycaps an advantage.

In a further particularly advantageous embodiment the keypad according to the invention is the actuating element about the locking means with corresponding locking means releasably connected to the frame. The actuator is then conducted exclusively in the context and cooperates with his side facing away from the key cap with the electric Switching device together.

It is particularly advantageous if the actuating element at the, with the electrical switching unit cooperating End has a broadening, the one has larger diameter than that of the widening adjacent section of the actuator. This will ensures that even with a tolerances due to position Keypad slightly offset switching unit the actuator can interact with the switch.

The invention will be described below with reference to exemplary embodiments and with reference to the accompanying drawings further explained.

FIG 1

eine perspektivische Ansicht einer ersten Ausführungsform eines Tastenblocks gemäß der Erfindung,

FIG 2

eine Längsschnittdarstellung des Tastenblocks nach FIG 1 entlang der Bedienfläche,

FIG 3

eine Längsschnittdarstellung des Tastenblocks nach FIG 2 entlang der Ebene A-A,

FIG 4

eine Längsschnittdarstellung des Tastenblocks nach FIG 2 entlang der Ebene B-B,

FIG 5

eine Schnittdarstellung des Tastenblocks nach FIG 2 entlang der Ebene C-C,

FIG 6

eine Seitenansicht des Tastenblocks nach FIG 2

FIG 7

eine Ausführungsform eines Betätigungselementes für einen Tastenblock nach FIG 2,

FIG 8

eine Ausführungsform eines Rahmens für den Tastenblock nach FIG 2,

FIG 9

eine Draufsicht auf den Rahmen nach FIG 8,

FIG 10

eine perspektivische Ansicht einer zweiten Ausführungsform des Tastenblocks gemäß der Erfindung,

FIG 11

eine Längsschnittdarstellung des Tastenblocks nach FIG 10

FIG 12

eine vergrößerte Darstellung des Ausschnitts K aus FIG 11,

FIG 13

eine Schnittdarstellung des Tastenblocks nach FIG 11 entlang der Ebene D-D,

FIG 14

eine Ausführungsform eines Betätigungselements des Tastenblocks nach FIG 11

FIG 15

eine Ausführungsform einer Tastenkappe des Tastenblocks gemäß der Erfindung mit zwei angeformten Federbeinen,

FIG 16

eine Seitenansicht der Tastenkappe nach FIG 15,

FIG 17

eine Längsschnittdarstellung der Tastenkappe nach FIG 15,

FIG 18

eine Ausführungsform eines Rahmens für den Tastenblock nach FIG 11,

FIG 19

eine Draufsicht auf den Rahmen nach FIG 18.

Shown schematically in each case:

FIG. 1

a perspective view of a first embodiment of a keypad according to the invention,

FIG. 2

1 is a longitudinal sectional view of the keypad according to FIG. 1 along the operating surface;

FIG. 3

3 is a longitudinal sectional view of the keypad according to FIG. 2 along the plane AA;

FIG. 4

FIG. 3 is a longitudinal sectional view of the keypad of FIG. 2 taken along the plane BB; FIG.

FIG. 5

a sectional view of the keypad of FIG 2 along the plane CC,

FIG. 6

a side view of the keypad of FIG. 2

FIG. 7

an embodiment of an actuating element for a keypad according to FIG. 2,

FIG. 8

an embodiment of a frame for the keypad of FIG 2,

FIG. 9

a top view of the frame of FIG 8,

FIG. 10

a perspective view of a second embodiment of the keypad according to the invention,

FIG. 11

a longitudinal sectional view of the keypad of FIG 10th

FIG. 12

an enlarged view of the detail K of FIG 11,

FIG. 13

a sectional view of the keypad of FIG 11 along the plane DD,

FIG. 14

an embodiment of an actuating element of the keypad of FIG 11

FIG. 15

an embodiment of a key cap of the keypad according to the invention with two molded struts,

FIG. 16

a side view of the key cap of FIG 15,

FIG. 17

a longitudinal sectional view of the key cap of FIG 15,

FIG. 18

an embodiment of a frame for the keypad of FIG 11,

FIG. 19

a plan view of the frame of FIG 18.

Corresponding parts and sizes are shown in FIGS to 19 provided with the same reference numerals.

1 to 9 show a first advantageous embodiment a keypad according to the invention.

The keypad 1 in Figure 1 consists of a frame 2 of three arranged in series, rectangular keys 3 encloses. The keypad 1 is not limited to three keys 3, but expandable to any number of buttons 3. The entire keypad 1 can break into one in a preferably glass, stainless steel or aluminum manufactured operating surface of a household appliance used become.

FIG 2 and FIG 3 show the individual components of the keypad 1. In the rectangular frame 2 are the keycaps 4 and the actuators 5 out. Each keycap 4 and each actuator 5 is in the frame run separately. On the sides of the keycaps 4, which too adjacent to the adjacent keys are snap hooks 6 provided. With the help of snap hook 6 are the Keycaps 4 locked to the frame 2. The maximum stroke the keycaps 4 is through the free path between the Completion of the side surfaces of the key caps 4 in the direction of actuation and the frame 2. The actuators 5 are designed as a T-profile, with the Cross struts 7 of the T-shaped actuating elements 5 in the Longitudinal direction of the keycaps 4 extend. The actuators 5 are not connected to the keycaps 4. The longitudinal struts 8 of the actuators 5 are with the electronic switching unit 9 locked. The rectangular one Frame 2 usually has on its narrow outside Snap hooks 10 on which serve the entire Keypad 1 in the control surface of the household appliance too fix. The key caps 4 are shown in FIG. 3 in one Starting position. The actuators 5 can the key caps 4 or another position between the key caps 4 and the switching element (not here represented) of the electrical switching unit 9 occupy.

4 shows a section along the plane B-B in FIG. 2 To the keycaps 4 are on the sides, which exclusively adjacent to the frame 2, in this case the long sides, Struts 11 formed from the center of the Run longitudinally diagonally to the outer corners and up rest on the frame 2. By pressing the button cap 4 the struts 11 are deformed, creating a tension is constructed (FIG 4, left button). Will the key cap 4 released, relax the struts 11 and take their original shape and the key cap 4 is through the released force returned to its original position. The struts 11 can in the starting position already biased or slightly deformed. Thereby can achieve a uniform height of all keycaps 4, because they are pushed outwards.

The sectional view of the keypad in FIG. 5 shows that on the frame 2 in addition to the snap hook 10 in addition noses 12 are attached, which serve the frame 2 in the Breakthrough in the control surface of the household appliance to fix and press it evenly against the control surface. The Arrangement of the snap hook 10 and lugs 12 on the frame 2 is shown in FIG.

7 shows a possible embodiment of an actuating element 5. The actuator 5 is a T-profile formed or at least in a section T-shaped. about the cross strut 7 can with lateral actuation of the button the pressure forces are diverted to the middle. The longitudinal strut 8 may be round or square and instructs the, remote from the keypad end a locking means 13 in Form of a circumferential depression, with the corresponding Locking means 25 of the electrical switching unit 9 comes into engagement (see FIG 3).

The rectangular frame 2 of the keypad 1 includes a Edge 14, which encloses the key caps 4 and on which the Noses 12 and snap hook 10 for attachment of the keypad 1 are mounted in the control surface (see FIG and FIG. 5). At the end with the keycaps is the edge 14 bent 90 ° outwards, creating a Circumferential Sims 15 is formed (see FIG 9 and FIG 5). Of the encircling Sims 15 lies on the surface of the control surface and forms a clean conclusion of the keypad 1. The height of the edge 14 usually corresponds to the Thickness of the control surface.

9 shows that the longitudinal sides of the edge 14 at the electronic switching device 9 facing side with Cross connections 16 are connected. The number of cross connections 16 corresponds to the number of buttons 3. Each cross connects 16 carries a guide frame 17 for guidance a key cap 4 in the frame 2. The guide frame 17 is substantially rectangular and lower than the edge 14 executed. The dimensions of the guide frame 17 are dependent from the inserted key cap 4th continues the guide frame 17 at the opposite narrow Pages, windows or protrusions 18 in which the snap hooks 6 of the keycaps 4 engage, which the guide frame 17 enclose.

The guide frame 17 has at each corner, laterally verjetzt to the corners in each case two bulges 19 in the direction of the edge 14 or of the adjacent guide frame 17 on. These bulges 19 are located on the inside of the Keycaps 4 on or the keycaps 4 are along led the bulges 19. As a result, that is the keycaps can not twist and always vertical to stand by each other.

As FIG 9 shows are in the middle of the cross-connections sixteenth Openings 20 attached. Through these openings 20 are the longitudinal struts 8 of the actuators 5 out.

The keypad 1 can be described below Order to be assembled. First, the frame 2 in Breakthrough in the control panel used and with the help of Snap hooks and noses fixed. Next, the actuators 5 from the outside through the frame 2 therethrough engaged with the electrical switching unit. Subsequently, the keycaps 4 on the guide frame 17 are put on. The fixation of the keycaps takes place by snapping the snap hooks 6 in the windows or projections 18 in the guide frame 17th

Now, the key cap 4 in the direction of the actuating element 5 moves, so is the interaction of key cap 4 and actuator 5 this in the same direction moved until it is on the switching element of the electrical switching device 9 is present. The by further pressing on the Actuator 5 acted upon force is on the Longitudinal strut 7 in the direction of actuation on the switching element the electrical switching unit 9 transmitted, whereby the Switching process is triggered. The maximum stroke of the actuator 5 and thus the maximum on the switching element acting force is through the circumferential recess the locking means 13 of the actuating element 5 and the engages engaging latching means 25 of the electrical switching unit 9 limited. If the key cap 4 is released again, it is due to the generated by the struts 11 Restoring force from the actuator 5 away to the outside emotional. The actuator 5 may be in contact with the Switching element remain or another position between Take the switching element and key cap 4. Press again the key cap 4 then triggers another switching operation out.

FIGS. 10 to 19 show a second embodiment of the invention Keypads according to the invention.

The keypad 1 'in FIG. 10 consists of a frame 2'. the seven arranged in series, rectangular keys 3 'encloses. The keypad 1 'is not on seven keys limited, but expandable to any number of buttons.

In FIG. 11 and FIG. 12, the components of the keypad are shown 1 'shown. As in the first embodiment also in this second embodiment in the rectangular Frame 2 'the keycaps 4' and the actuators 5 'out. Each keycap 4 'and each actuator 5 'is managed separately in the frame. The actuators 5 'are not connected to the keycaps 4'. in the Contrary to the first embodiment, here are the actuators 5 'not with the electrical switching unit (not shown here) but with the frame 2 'locked.

The rectangular frame 2 'has its narrow outer second Snap hooks 10 'and noses 12', which serve the entire keypad 1 'in the control surface of the household appliance to fix and press (see FIG 12 and FIG. 13).

FIGS. 15 to 17 show a key cap 4 'for use in the keypad 1 '. On the long sides of the key cap 4 ' is ever a strut 11 'formed from a corner of the Long side out to the diagonally opposite corner. The struts 11 'are opposite to each other, As a result, the key cap 4 'evenly outward pressed. But the struts 11 'can also in the same Directed direction. By pressing the button cap 4 'are the struts 11' against the frame 2 'as Abutment cocked. The struts 11 'can in the starting position be biased again, creating a uniform height of all keycaps 4 'is achieved. At the sides of the keycaps 4 ', which also to the adjacent Buttons can be adjacent, windows 21 'are introduced the with the frame 2 'attached snap hook 22' solvable are connected (see also FIG 12).

The rectangular frame 2 'of the keypad 1' of FIG 11 includes a rim 14 'which encloses the keycaps 4' and at which the lugs 12 'and snap hook 10' for attachment of the keypad are mounted in the control surface (See Figure 18, Figures 11 and 13). At the with the. keycaps final end is the edge 14 'with a circumferential Sims 15 'completed (see FIG 19 and FIG 11), the on the surface of the operating surface rests.

FIG. 19 shows that the longitudinal sides of the edge 14 'on its the electronics facing side with cross connections 16 ' are connected, which carry a guide frame 17 'over in each case a key cap 4 'in the frame 2' is performed. The guide frame 17 'is substantially rectangular and lower than the edge 14 'executed. The dimensions of the Guide frame 17 'are dependent on the key cap used 4 '. Furthermore, the guide frame 17 'to the opposite narrow sides, snap hooks 22 'on, which can snap into the keycaps 4 '.

FIG. 18 and FIG. 12 show that at 'the key cap 4' facing surface of the guide frame 17 'in the middle Openings 20 'are mounted, in which the actuators 5 'are introduced. At the electrical switching unit facing side of the openings 20 'extends a Verrastrahmen 24 'in the direction of the electrical switching unit. The Verrastrahmen 24 'ends in locking means 25', in the recess formed as a detent means 13 'of the Actuate 5 'engage (see FIG 12 and FIG 13).

The maximum stroke of the actuating element 5 'and thus also the maximum on the switching element (not shown here) acting force is in this second embodiment by the latching means 13 'of the actuating element 5' and the limited engaging latching means 25 '. The actuator has at its the switching element of the electric Switching unit facing side a widening 23 'which is larger in diameter than the rest of the actuator 5 '(see also FIG. The broadening allows it also with a slightly offset switching element the force to trigger the switching operation on this transfer.

The keypad 1 'shown in FIG 10 to 19 can be completely pre-assembled become. The preassembled keypad 1 'can then with a handle in the control surface of the household appliance are used, which makes the manufacturing process clear shortened.

LIST OF REFERENCE NUMBERS

1, 1 '

keypad

2, 2 '

frame

3, 3 '

button

4, 4 '

keycap

5, 5 '

actuator

6, 6 '

snap hooks

7

crossmember

8th

longitudinal strut

9

electrical switching unit

10, 10 '

snap hooks

11, 11 '

Suspensions

12, 12 '

nose

13, 13 '

latching means

14. 14 '

edge

15, 15 '

ledge

16, 16 '

cross connection

17, 17 '

guide frame

16

Window or projection

19

bulge

20, 20 '

opening

21 '

window

22 '

snap hooks

23 '

widening

24 '

Verrastrahmen

25, 25 '

latching means

Claims (15)

1. Keypad (1) for insertion in an operating surface of a domestic appliance, in particular a screen composed of glass, special steel, aluminium or materials with similar properties comprising

   a) at least one key (3) comprising
   a key cap (4) and
   an actuating element (5), which is disposed or may be disposed between the key cap and an electric switching unit of the domestic appliance and upon actuation of the key cap cooperates therewith and with the electric switching unit to trigger a switching event,

   b) at least one spring element (11) which upon actuation of the key provides a restoring force for putting the key cap back, and

   c) a frame (2) in which the at least one key is guided, wherein

   d) the key cap abuts a corresponding active area of the actuating element upon actuation via an active area, and transmits a force to the actuating element in the actuating direction, and wherein

   e) the key cap and actuating element are not connected together at least at their corresponding active areas, characterised in that for each key a separate guide frame is formed and regions of the surface of the guide frame abut corresponding regions of the inner face of the side faces of the key cap.
2. Keypad according to claim 1, wherein the at least one spring element is not connected in terms of force to the actuating element.
3. Keypad according to claim 1 or claim 2, wherein the at least one spring element is integrally formed with the key cap and abuts the frame.
4. Keypad according to one or more of claims 1 to 3, wherein the at least one spring element is biased in a starting position.
5. Keypad according to one or more of the preceding claims, wherein the at least one spring element is a telescopic leg integrally formed with the key cap.
6. Keypad according to claim 5, wherein four telescopic legs are integrally formed on the key caps.
7. Keypad according to claim 5, wherein two telescopic legs are integrally formed on the key cap.
8. Keypad according to one or more of the preceding claims, wherein the frame is inserted or is insertable together with the keys guided therein into a perforation in the operating surface.
9. Keypad according to claim 8, wherein on the frame means are formed for the fixing of the keypad in the perforation.
10. Keypad according to one or more of the preceding claims, wherein the position of the actuating element may be varied with respect to the key cap in the actuating direction and/or perpendicular to the actuating direction within a respectively specified range of tolerances.
11. Keypad according to one or more of the preceding claims, wherein on the actuating element a catch means is formed which comprises recesses or projections, preferably channels, grooves, lugs or hooks.
12. Keypad according to one or more of the preceding claims, wherein the actuating element is detachably connected via the catch means to corresponding catch means on the electric switching unit.
13. Keypad according to one or more of the preceding claims, wherein the actuating element is formed T-shaped at least in section.
14. Keypad according to one or more of claims 1 to 10 and 11, wherein the actuating element is detachably connected via the catch means to corresponding catch means on the frame.
15. Keypad according to claim 13, wherein the actuating element has on the end cooperating with the electric switching unit a widening which has a larger diameter than the section of the actuating element bordering the widening.

Images