Control panel with full-surface touchscreen and movable push buttons that extend beyond the touchscreen.

Abstract

Control panel with full-surface touchscreen and movable pushbuttons that extend beyond the touchscreen, characterized in that the pushbuttons are attached laterally to the back of the touchscreen and can be variably positioned along the sides of the control panel.

Description

1 State of the art

[0001] Standard touchscreen control panels have no buttons. Commands are triggered by tapping the corresponding area on the screen with a finger or by swiping. 1.1 Problem statement

[0002] Touchscreens offer users no tactile reference points on the display. They often have very low contrast, the monitor's backlighting is frequently glaring, and the text is barely legible. Therefore, touchscreens are often unusable for elderly and / or motor-impaired individuals, as well as those with visual impairments. Without alternatives, these individuals are excluded from independent participation in the most basic aspects of everyday life.

[0003] With standard touchscreens, users must see the area on the screen to input a command; tactile input is not possible on a flat, smooth touchscreen. This makes issuing the desired command difficult or impossible for people with disabilities.

[0004] When a surface is being scanned or viewed, it must be clearly recognizable for people with disabilities where a command input is possible. A raised button is easily recognizable.

[0005] The key must not trigger a command when simply pressed. For people with disabilities, a clear difference in pressing force or duration is necessary to input a command via keys. 1.2 The state of the art and its problems for operation 1.2.1 Command triggering

[0006] Pressure-sensitive touchscreens exist. These are often referred to as resistive touchscreens or pressure-sensitive displays. Resistive touchscreens respond to pressure, regardless of whether you press on them with a finger, a stylus, or a glove. They consist of two conductive layers that touch when pressure is applied, thus detecting the position of the touch. Pressure-sensitive touchscreens measure the pressure applied and can trigger different functions depending on how hard you press. This technology is used in some smartphones and graphics tablets.

[0007] Capacitive touchscreens, which are used in most modern smartphones and tablets, respond to touch, not pressure. They only react to conductive input devices, such as fingers. Resistive displays, on the other hand, can also be operated with gloves, styluses, or fingernails.

[0008] Visually impaired and motor-impaired people have the problem that they trigger (considerable) pressure upon first contact with a command field, causing the command to be executed immediately - even if this is not intended.

[0009] In everyday use, operating systems are designed to be activated by light touch. For non-disabled individuals, operation (triggering a command) is only possible after applying more pressure to a touchscreen. Prolonged pressure or multiple presses (repeatedly pressing several times in quick succession) are also uncommon and inconvenient.

[0010] For people with disabilities, a separate pressure setting can be configured in the operating system by: ▪ the operating system is automatically adjusted remotely, for example by detecting a severely disabled person. This means that the passenger is dependent on a flawlessly functioning control system. ▪ First, a special button near the control panel must be pressed. This means an additional step for the severely disabled person, which makes it more difficult for them to access the controls.

[0011] Remote controls and special keys in operating systems mean extra effort for both the user and the manufacturer. 1.2.2 Feedback

[0012] To provide feedback on command activation (confirmation of command activation), vibration of the entire touchscreen and / or the housing (with a suitable design that facilitates vibration paths) is suitable for visually and hearing impaired individuals. The larger the touchscreen surface, the more expensive the measures become, as the glass mass dampens the effect of the actuators, necessitating the use of multiple or more powerful, finely tuned actuators. For "click" sensations near the finger, fast drivers, low-latency detection, and potentially localized actuator zones or friction modulation methods (ultrasound / electrovibration) are required. This friction modulation generates scalable, perceptible changes in friction / texture without moving large masses. 1.3 Standards

[0013] There are standards that must be followed to simplify operation for people with disabilities. Depending on the application, these standards vary and specify minimum dimensions, graphic relief, light contrast, position, and minimum distances between buttons. 1.4 The aim of this design

[0014] Independent accessibility for all users, regardless of physical limitations, is becoming increasingly important in society (topics: accessibility, inclusion and age-appropriate design).

[0015] The design significantly simplifies finding and triggering commands for people with physical limitations (not just people with disabilities) compared to conventional touchscreens. It also complies with applicable standards for simplified operation for people with disabilities. 1.5 Areas of application

[0016] The control panel with touchscreen and buttons has a wide range of applications. It can be used in private and public buildings, wherever comfortable and accessible operation is needed for all users, for example in residential and commercial buildings, government offices, shopping centers, museums, and hotels. It is available in various formats and sizes.

[0017] Examples of possible applications can be seen in the attached drawings (Drawing 1a, Drawing 1b, Drawing 1c). 2 The example of an elevator control panel

[0018] As an example of the design, the design of a car operating panel (COP) for elevator cabins with a touchscreen is described here.

[0019] The standard DIN EN 81-70 specifies how control panels must be designed to improve accessibility for people with disabilities. Annex B, "Extra-large control buttons," describes how the accessibility of the buttons for people with disabilities can be further improved.

[0020] As societal developments demand age-appropriate, barrier-free elevators, clients are increasingly opting for the use of extra-large control buttons when constructing elevators. Although Annex B of the DIN EN 81-70 standard is not currently a general requirement for construction projects, it is expected to become increasingly important.

[0021] The design complies with the standard DIN EN81-70 Annex B. 2.1 Key standard requirements of DIN EN81-70 for the design

[0022] The control devices must comply with the standard DIN EN 81-70 5.4.2.1 Requirements for the design and arrangement of control devices. This standard severely restricts the area in which pushbuttons can be positioned: Features Commander at the bus stop Commander in the elevator car a) Minimum height from the finished floor to the center line of the lowest button (door closing button and other control devices may be arranged at a different height) 850 mm b) greatest height from the finished floor to the center line of the uppermost button 1,100 mm 1200 mm (preferably 1100 mm) c) Arrangement of the buttons vertical See 5.4.2.3.1, 5.4.2.3.3 d) Minimum lateral distance between the center line of pushbuttons and the corner of adjacent walls 500 mm (preferably 700 mm). Recesses in which pushbuttons can be arranged must be limited to 250 mm (see Figure 3). 400 mm a) Minimum area of ​​the active part of the button 490 mm 2 b) Minimum dimensions of the active part of the button Incircle with a diameter of 20 mm c) Detection of the active part of the button Visually (by contrast, see 5.1.2) and tangibly protruding from the top plate or the immediate surroundings d) Detection of the cover plate Luminance contrast to its surroundings (see 5.1.2) a Luminance contrast to their surroundings (see 5.1.2) with fewer than 5 buttons e) Actuating force 2.5 N to 5.0 N f) Feedback during operation Required to inform the passenger that the button has been pressed (e.g., the button makes a perceptible movement or is equipped with a mechanical feedback system). g) Feedback on order acceptance Required to inform the passenger, through visual and audible indicators, that their call or command has been recorded. The audible indicator must comply with 5.1.3 and sound every time the button is pressed, even if such a command has already been accepted. h) Button for the building exit stop Not applicable Protruding 5 mm ± 1 mm beyond other pushbuttons (preferably green) i) Arrangement of the symbol If present, on the active part or 10 mm to 15 mm to its left. On the active part or 10 mm to 15 mm to its left i) symbol If available, with contrast to the background (see 5.1.2), with a character height of 15 mm to 40 mm. Relief with contrast to the background (see 5.1.2), with a character height of 15 mm to 40 mm k) Height of the relief of the active part (c) and of the symbol (j) At least 0.8 mm (1.0 mm recommended) l) Distance between active parts of call buttons or floor buttons At least 10 mm m) Distance between group of drive command buttons and group of other buttons b Not applicable At least twice the distance between the active parts of the floor buttons a Required only for collective control systems whose command transmitters are not installed in the door frame. b For example, between emergency call / door buttons and floor buttons.

[0023] Control devices in the elevator car must meet the requirements from the tables above and be arranged as follows: - The floor buttons must be located above the emergency call button and the door button. - The floor buttons in a single horizontal row must be arranged from left to right. The floor buttons in a single vertical row must be arranged from bottom to top, and in the case of multiple vertical rows, from left to right and then from bottom to top.

[0024] The minimum brightness for command transmitters is 100 ix. The luminance contrast should meet the following requirements: Section Object Minimum light reflectance point difference LRV1 - LRV2 Minimum luminance contrast C M [%] Minimum light reflectance of the lighter surface LRV1 perspective Table 4, point c) active part of the buttons in relation to their environment 30 - - 45° above the horizontal Table 4, point d) Cover plate to its surroundings 30 - - horizontal Table 4, Item j) Symbols on buttons for active areas - 50 50 45° above the horizontal 5.4.3.3. c) Elevator labeling for background - 50 50 horizontal Displays must have adequate luminance contrast with their immediate surroundings. DIN 32975 specifies requirements for the design of visual information in public spaces to ensure accessibility.

[0025] The following requirements apply in particular to digital advertisements: ▪ Luminance contrast: digital displays must have sufficient contrast between text and background to improve readability for people with visual impairments. ▪ Font size and character spacing: The font size and the spacing between characters must be chosen so that information is easily recognizable even from a greater distance. ▪ Lighting and reflection: The displays should be positioned and illuminated in such a way that reflections are minimized and the content remains clearly visible under different lighting conditions. ▪ Dynamic content: Moving or changing content must have an appropriate display duration so that it can be seen by all users. 2.2 Further essential standard requirements of DIN EN 81-70 for the design: Annex B

[0026] The legislator distinguishes between two formats for commanders: ▪ the basic format with a minimum diameter of 20mm (standard DIN EN81-70). ▪ the extra-large control transmitters, with a minimum diameter of 50 mm, which allow even better accessibility (standard DIN 81-70 Annex B Extra-large control transmitters).

[0027] Extra-large control devices should comply with the standard DIN EN 81-70 Annex B.3: Pushbuttons must meet the above requirements (see 2.1) with the following deviations and additional requirements regarding their arrangement: - The minimum dimensions of the active part must be 50 mm x 50 mm or have a diameter of 50 mm. - The size of the symbols that must be arranged on the active part of the button must be between 25 mm and 40 mm. - The floor buttons must be installed on an inclined and horizontally arranged plate; the inclined plate may not project more than 100 mm at an angle of 30° ± 15° to the vertical. - the greatest vertical distance between the finished floor and the center line of the uppermost button must not exceed 1000 mm. - If there is only one row of floor buttons, the buttons must be arranged from left to right. - Door opening and emergency call buttons as well as door closing buttons, if present, must be separated from the floor buttons by a distance of at least twice the distance between the active parts of the floor buttons. - If there are two or more rows of floor buttons, they must be arranged from left to right and then from bottom to top. 2.3 The state of the art and its problems for operation

[0028] In a market increasingly specializing in residential construction, residents are being provided with more and more communication options for information exchange. Touchscreen displays in elevators show the following digital content: - Commander for selecting floors and special functions - Name tags - Advertising - News (Update) - useful elevator information and safety instructions - Entertainment (videos and animations) - Corporate communications - Events and Agenda - Social Media Feeds - local attractions and tourist information - Multi-tenant building content (personalized messages) - Weather reports - Information on maintenance and assembly

[0029] The screens offer passengers all kinds of information – from announcements to animations. Maintenance and housekeeping staff can also access information here.

[0030] The standard DIN EN 81-705.4.2.1.g requires mechanical feedback after a command is issued. As already described in section 1.2, compliance with this standard is costly for touchscreens. 3 The Design 3.1 The Problem Underlying the Utility Model

[0031] To comply with the DIN EN 81-70 standard, the screen (Drawing 2 (1)) and the control panel (Drawing 2 (2)) are separated in modern elevators (conventional design). Therefore, in conventional designs, there is no combination of a control panel (buttons) and the associated, interchangeable information (screen) as specified in DIN EN 81-70, Annex B.

[0032] If the passenger wants to interact with the screen content, the control buttons and the screen content are not directly visually connected in the standard design. Therefore, the screen must display instructions indicating which control button should be used for which information. It is thus advisable that the control button has a visual link to the relevant information. A different format is required for each piece of information. For example, a name tag requires less space than a message. The distance between the control buttons should be variable. 3.2 Objective of the design

[0033] The design, in accordance with DIN EN 81-70 Annex B, offers a combination of a control panel (button) and the associated, interchangeable information (screen). 3.3 The rejected solution approach: Relief foil

[0034] To improve accessibility, touchscreens (Drawing 3 (1)) could be equipped with a relief film (Drawing 3 (2)) that enables haptic recognition of the command transmitters. The standard DIN EN 81-70 5.4.3 f) requires a system for mechanical feedback.

[0035] However, this solution has the following disadvantages: - The passenger feels around the control panel to find the correct button, touching buttons they do not intend to press. It must be clear whether a button was touched with the intention of activating it or not; in this case: - Option 1: there is a difference in the pressure required and / or the duration of the press, or the button must be pressed multiple times; however, these solutions are unacceptable for non-disabled passengers. - Option 2: the passenger is recognized as a disabled passenger either automatically or by pressing a special button for disabled passengers beforehand (remotely); this solution is cumbersome for the disabled passenger and makes them dependent on the connection technology. - Confirmation of the command activation via vibration is suitable for visually and hearing impaired passengers; as already described in 1.2, however, this solution is costly. - Pressure-sensitive touchscreens are more expensive than capacitive ones. 3.4 Implementation of the design

[0036] The control panel consists of: - Frame that allows for 2 types of control panel designs: - Control panel with capacitive touchscreen (Drawing 4 (1)) - Control panel without touchscreen but with an opaque front surface, for example made of HPL (Drawing 4 (2)). - Back, the: - mounted horizontally on a support (if present, the handrail) (Drawing 5 (2)) using wall brackets. The control panel can then be positioned at the desired angle (between 15 and 30 degrees to the wall to comply with DIN EN 81-70 Annex B). The back panel (Drawing 5 (1)) can also be mounted directly on the wall without adhering to the angle specified in DIN EN 81-70 Annex B. - can be mounted directly vertically on the wall. - Mechanical, tactile pushbuttons that are inserted into pushbutton frames. This creates the pushbutton unit. There are two pushbutton units: - with a button (Drawing 6 (1)). - with up to 3 pushbuttons. Rotary switches can also be used here instead of pushbuttons, which only occupy the otherwise empty space (Drawing 6 (2)).

[0037] To meet the requirements of DIN EN 81-70 Annex B, the control panel must be arranged horizontally. If arranged vertically, it complies with DIN EN 81-20, but no longer with DIN EN 81-70 Annex B.

[0038] In order for the command to be transmitted to the touchscreen, the buttons and the associated switch contacts must be conductive (material selection).

[0039] When the control panel is oriented vertically, the orientation of the graphics on the buttons changes.

[0040] The button unit is attached to the back. It can be connected to various slots, allowing it to be positioned according to the information displayed on the screen.

[0041] There are 2 configurations of the control panels: - Up to 27 floors can be operated using buttons on the long sides of the control panel (Drawing 7 (2)): 0-26 floor buttons, emergency call button, door opener button and a special button. - Up to 27 floors can be operated using buttons on the long and short sides (Drawing 7 (1,2)) of the control panel: 0-26 floor buttons, emergency call button, door opener button and 2 special buttons 3.5 Examples of the design

[0042] For example, the touchscreen can be used to display the names of residents along with advertisements (Drawing 8a (1)), to announce appointments for residents (Drawing 8a (2)), to use messages with reply options (Drawing 8a (3)), to communicate invitations (Drawing 8b (1)), to announce calls for donations (Drawing 8b (2)), or simply to upload images (Drawing 8b (3)).

[0043] HPL fronts can be provided with residents' names (print or sticker) (Drawing 8c (1)). 3.6 The advantages of the design: Flexibility and interaction

[0044] The buttons can be directly assigned to screen content and are therefore flexibly positioned at different locations on the screen. This concept enables interactive communication (requests, polls, resident information, advertising, building announcements). Authorized users (e.g., residents) can edit content themselves and answer requests (on-site or remotely).

[0045] Information (e.g., name tags) can be displayed in any format. For example, images or color schemes can be adapted to the mood of the elevator.

[0046] If there are changes in the building, the position of the buttons can be changed to match the updated information on the screen.

[0047] Most residential elevators serve 3 to 5 floors. This leaves plenty of space for screen graphics. The button layout ensures a balanced appearance compared to conventional button arrangements. Clear operation

[0048] The passenger can feel the clearly separated buttons without accidentally triggering a command.

[0049] Since the buttons not only maintain the prescribed two-dimensional distance from each other, but also stand out three-dimensionally from the user surface and the contour of the control panel, they can be distinguished from each other even more easily. equipment

[0050] The control unit can be equipped with or without a screen.

[0051] Other types of buttons are conceivable: for example, rotary switches (Drawing 9 (2)) mounted on the touchscreen (Drawing 9 (1)) can also transmit adjustable commands.

[0052] For through-loading systems, the standard-mandatory door-opening buttons can be mounted on the left and right sides of the control panel. This clearly identifies them as belonging to a specific door.

[0053] The control panel with screen can also be used as an information panel without buttons.

[0054] If only 3-button units are to be used, unused buttons can be used. Assembly

[0055] The buttons for the touchscreens do not require any electronic components and can be replaced without screws; the electronic contacts remain unaffected.

[0056] The control panel can be mounted both horizontally and vertically (when mounted vertically, it meets the standard DIN EN 81-70, but not the requirements of Annex B).

[0057] The tilt of the control panel, with or without a screen, can be continuously adjusted between 15 and 30 degrees.

[0058] A special tool is provided for the removal and installation of the pushbuttons to prevent them from being removed by unauthorized persons. 3.7 Overview of the components

[0059] The following tables provide an overview of the components. The assembly of the components is listed in the document "Claims". Button unit - components for touchscreen control panels 1-button unit Number / Button unit component remark 1 push button The graphic on the button must be rotated 90 degrees for use on an vertically arranged control panel. 1 Front part of the button unit 1 Button unit back panel 1 Feather 1 Contact point 3 Light guide in the front part of the push-button unit 1 LED unit in the back of the push-button unit The LED unit has 1 light source / light guide. 3 Light guide in the back of the push-button unit 3-button unit Number / Button unit component remark up to 3 push button The graphic on the button must be rotated 90 degrees for use on an vertically arranged control panel. up to 2 Non-functional button (placeholder) 1 Front part of the button unit 1 Button unit, back panel, top 1 Button unit, back panel, bottom up to 3 Feather up to 3 Contact point 6 Light guide in push-button unit front part 2 LED unit in the back of the push-button unit and the front of the push-button unit The LED unit has 1 light source / light guide. 6 Light guide in push-button unit back panels (3 / back panel) Light guides can optionally be installed in the control panel with HPL front. 2 optical fibers The light guides will be used to illuminate the central push button. Control panel Number / Control panel component remark 1 Touchscreen glass 1 Glass adhesive layer 1 Frame 1 Touchscreen 1 Circuit board 1 Back 2 different backs: for mounting with / without side buttons 1 Lid on top 1 Lid below 1 sealing ring The cables are guided through the sealing ring. screws Number component remark 2 / button unit Screw connection back / back panel 1-button unit 4 / Button unit Screw connection back / back panels 3-button unit 4 to 32 Screw connection circuit board / back Number of screws depends on requirements and available space on the circuit board. 6 Screws back / touchscreen / frame Pushbutton unit - components for control panels with HPL front 1-button unit Number / Button unit component remark 1 push button The graphic on the button must be rotated 90 degrees for use on an vertically arranged control panel. 1 Front part of the button unit 1 Button unit back panel 1 Feather 1 Contact point 1 Switch Available as a standard part for elevator switches 1 Fixing ring 3 Light guide in push-button unit front part 1 LED unit in the rear of the push-button unit The LED unit has 1 light source / light guide. 3 Light guide in the back of the push-button unit Light guides can optionally be installed in the control panel with HPL front (with / without switch light) 3-button unit Number / Button unit component remark up to 3 push button The graphic on the button must be rotated 90 degrees for use with an vertically arranged control panel. up to 2 Non-functional button (placeholder) 1 Front part of the button unit 1 Button unit, back panel, top 1 Button unit, back panel, bottom up to 3 Feather up to 3 Contact point up to 3 Switch Available as a standard part up to 3 Fixing ring 3 Light guide in push-button unit front part 2 LED unit in the rear of the push-button unit and the front of the push-button unit The LED unit has 1 light source / light guide. 6 Light guide in push-button unit back panels (3 / back panel) 3 light guides / push button unit front part 3 light guides / push button unit rear Light guide optional (see above) 2 optical fibers The light guides will be used to illuminate the central push button. Control panel Number / Control panel component remark 1 HPL front Material choice possible 1 Frame 1 Circuit board 1 Back 2 different backs: for mounting with / without side buttons 1 Lid on top 1 Lid below 1 sealing ring The cables are guided through the sealing ring. screws Number component remark 4 / Fixing ring Screw connection HPL front / fixing ring / frame 2 / button unit Screw connection back / back panel 1-button unit 4 / Button unit Screw connection back / back panel 3-button unit 4 to 32 Screw connection circuit board / back Number of screws depends on requirements and available space on the circuit board. 6 Screws back / touchscreen / frame 3.8 The tool

[0060] This tool can be used to remove the front part of the button unit from the back part.

[0061] The front part (Drawing 12 (1)) snaps onto the back part (Drawing 12 (3)). It can only be separated from the back part of the sensor unit using a special tool.

[0062] To remove a 1-digit stylus assembly, the curved surface of the tool (Drawing 12 (8)) is placed against the front part of the stylus assembly. For a secure hold, the arms of the tool (Drawing 12 (2)) slide around the spring of the stylus (Drawing 10 (4, 4a, 4b, 4c)) and lock it in place. The side surfaces (Drawing 12 (4a, 4b)) are then pressed together by hand, with the thumb and forefinger placed in the concave surfaces. The side surfaces are guided by tabs (Drawing 12 (5a, 5b)). This causes the tips (drawing 12, 6a and 6b) to engage in the openings of the back part of the sensor unit and release the snap connections (drawing 12, 7a and 7b) which connect the back part to the front part.

[0063] To remove a 3-stylus assembly (Drawing 13 (1)) or two opposing 1-stylus assemblies (Drawing 13 (2)), two tools are inserted into one another (Drawing 12 (9)) and leaned against the front part of the stylus assembly. As with removing the 1-stylus assembly, the front part can be removed from the back parts by simultaneously pressing all four side surfaces (Drawing 12 (4a, 4b, 4c, 4d)) together.

[0064] The tool can remove the front parts of the sensor units in both vertical and horizontal positions. Drawings drawing Theme Page 1a Example of a control panel in the zoo 2 1b Example of a control panel in a museum 3 1c Example of a control panel for fast food 4 2 Control panel today according to DIN EN81-70 Annex B 5 3 Control panel with relief film 6 4 Differences between touchscreen and HPL front 7 5 Cable routing and handrail mounting 8 6 Control panel and push button assemblies 9 7 Horizontal and vertical alignment 10 8a Examples of touchscreen design 11 8b Examples of touchscreen design 12 8c Example design HPL front 13 9 Example information panel with rotary switch 14 10 Exploded View 1- and 3-button unit 15 Reference symbol list for drawing 10 16 11a Assembling the touchscreen single-button unit 17 Reference symbol list for drawing 11a 18 11b Assembling the touchscreen 3-button unit 19 Reference symbol list for drawing 11b 20 11c Assembly of HPL front panel, single button unit 21 Reference symbol list for drawing 11c 22 11d Assembly of HPL front panel 3-button unit 23 Reference numeral list for drawing 11d 24 12 Tool function 25 13 Tool configurations 26 Reference symbol list for drawing 10

[0065] 1-button unit 1 Back panel button unit 2 LED units 3 fiber optic cables 4 springs 5 Front part 6 Contact 7-button 3-button unit 1a Back panel button unit top 1b Back panel button unit bottom 2a LED unit top 2b LED unit bottom 3a Light guide top 3b Light guide bottom 4a Top spring 4b Spring Center 4c bottom spring 6a Contact at top 6b Contact Center 6c Contact below 7a Button at top 7b Button Center 7c button below 8 Front part button unit 9a Light distributor above 9b Light distributor below Reference symbol list for drawing 11a 1 protective glass 2 Glass adhesive layer 3 frames 4a Light source unit top 4b Light source unit bottom 5a Back panel button unit top 5b Back panel button unit bottom 6a Light guide top 6b Light guide bottom 7a Button at top 7b button below 8a Top cover 8b Bottom cover 9 Back 10 Touchscreen 11 Circuit board 12a Contact above 12b Contact below 13a Spring top 13c bottom spring 14a Front part button unit top 14b Front part button unit bottom 15 Wiring harness 16 sealing rings 17 Supports (Handrail) Reference symbol list for drawing 11b 1 protective glass 2 Glass adhesive layer 3 frames 4a Light source unit top 4b Light source unit bottom 5a Back panel button unit top 5b Back panel button unit bottom 6a Light guide top 6b Light guide bottom 7a Button at top 7b Tater Mitte 7c button below 8a Top cover 8b Bottom cover 9 Back 10 Touchscreen 11 Circuit board 12a Contact above 12b Contact Center 12c Contact below 13a Spring top 13b Spring Center 13c bottom spring 14 Front part button unit 15a Light distributor top 15b Light distributor below 16 Wiring harness 17 sealing ring 18 Supports (Handrail) Reference symbol list for drawing 11c 1 HPL front 2a Top fixing ring 2b Bottom fixing ring 3 frames 4a Switch at top 4b Switch below 5a Light source unit top 5b Light source unit below 6a Light guide top 6b Light guide bottom 7a Back panel button unit top 7b Back panel button unit bottom 8a Button top 8b button below 9a Top cover 9b Bottom cover 10 Back 10 Touchscreen 11 Circuit board 12a Contact above 12b Contact below 13a Spring top 13c bottom spring 14a Front part button unit top 14b Front part button unit bottom 15 Wiring harness 16 sealing rings 17 Supports (Handrail) Reference symbol list for drawing 11d 1 HPL front 2a Top fixing ring 2b Bottom fixing ring 3 frames 4a Switch at top 4b Switch Middle 4c switch at the bottom 5a Light source unit top 5b Light source unit below 6a Light guide top 6b Light guide bottom 7a Back panel button unit top 7b Back panel button unit bottom 8a Button top 8b Button Center 8c button below 9a Top cover 9b Bottom cover 10 Back 11 Circuit board 12a Contact above 12b Contact Center 12c Contact below 13a Spring top 13b Spring Center 13c bottom spring 14 Front part button unit 15 Wiring harness 16 sealing rings 17 supports (handrail) QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] DIN EN 81-705.4.2.1.g

[0030]

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