Lift car, lift system comprising a lift car, and method for operating a lift system
The integration of a recessed handrail and haptic control panel with contrasting colors and tactile feedback addresses the operational challenges for visually impaired and wheelchair users, improving elevator cabin accessibility and usability.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LIFT AG
- Filing Date
- 2025-10-21
- Publication Date
- 2026-04-30
AI Technical Summary
Elevator cabins are difficult for individuals with impaired vision to operate and often cramped for wheelchair users, with handles further restricting space.
Incorporation of a recessed handrail and haptic control panel in the elevator cabin, featuring contrasting colors and illumination for visual impairment, and adjustable button sizes and tactile feedback for easy operation.
Enhances accessibility for visually impaired individuals and wheelchair users by optimizing space usage and providing intuitive, tactile navigation and control.
Smart Images

Figure EP2025080358_30042026_PF_FP_ABST
Abstract
Description
[0001] Elevator cabin, elevator system comprising an elevator cabin and methods for operating an elevator system
[0002] The present invention relates to an elevator cabin, an elevator system comprising an elevator cabin and a method for operating an elevator system.
[0003] Elevator cabins are known. EP 4 021 836 Bl discloses an elevator cabin with a touch-sensitive screen system.
[0004] Such an elevator cabin has the disadvantage that it is difficult for a person with impaired vision to operate. Furthermore, elevator cabins are often very cramped for wheelchair users, and the handles on the sides further restrict the available space.
[0005] The object of the invention is to overcome the disadvantages of the prior art and in particular to create an elevator cabin which can be easily operated and used by a person with impaired vision and / or by a wheelchair user.
[0006] The problem is solved by an elevator cabin, an elevator system comprising an elevator cabin and a method for operating an elevator system according to the independent patent claims.
[0007] In particular, the task is solved by an elevator car comprising an interior space. The interior space is bounded by a door and an opposite end wall or by another door, a first side wall, and a second side wall opposite the first side wall. The first side wall and / or the second side wall has a main surface. The main surface has at least one recess. A handrail is arranged in the recess. The handrail may be arranged horizontally.
[0008] In such an elevator cabin, a person with impaired vision can easily feel the handrail in the recess. Furthermore, the handrail's placement in the recess allows for efficient use of the available space and optimizes the room for a wheelchair user. Thus, the recessed handrail provides a space-saving technical solution that makes the elevator cabin easily accessible for people with impaired vision.
[0009] A person with impaired vision is a person who has limited or no vision, i.e., is blind.
[0010] The walls can each be made of stainless steel. It is possible that the walls are at least partially mirrored. The recess in the first and second side walls can be identical. In this case, a person with impaired vision can easily locate the handrail in the recess on both side walls. The handrail can be made of stainless steel. Both the handrail and the recess have a longitudinal axis, with each longitudinal axis oriented in the direction of the maximum extent of the recess or handrail, respectively. The longitudinal axis of the handrail can also be its axis of rotation, provided the handrail has a circular cross-section. The longitudinal axes can be arranged parallel and spaced apart.
[0011] It is possible for the main surface of the first side wall and / or the second side wall to be painted in a contrasting color to the surface of the recess. For example, the main surface of the first side wall and / or the second side wall could be painted in a dark color, while the surface of the recess could be painted in a light color. This would allow a person with impaired vision to quickly identify the recess and more easily locate the handrail.
[0012] It is possible that, in addition to the high-contrast paint finish, the surface of the recess is or will be illuminated, or indirectly illuminated. This illumination, in addition to the high-contrast paint finish, further improves the visual visibility of the recess and handrail, making it even easier for a person with impaired vision to reach and feel the recess and handrail.
[0013] Alternatively or additionally, the object of the invention is further solved by an elevator car comprising an interior space. The elevator car can be an elevator car as described above. The interior space of the elevator car is bounded by a door and an opposite end wall, or by a further door, a first side wall, and a second side wall opposite the first side wall. A haptic control panel is arranged in the interior space. The haptic control panel comprises a surface haptic element or a mechanical push button.
[0014] Such a control panel allows a person with impaired vision to comfortably and quickly enter information on the control panel in the elevator cabin and receives haptic information about the selected button and the actual selection.
[0015] If the elevator cabin is a cabin as described above, then the elevator cabin has the same additional advantages as described above.
[0016] A haptic control panel is a control panel where buttons are displayed in a way that allows them to be perceived by touch. It is therefore a touch-sensitive display with haptic feedback. The display has a flat surface, and the haptic effects are generated through surface texture. Different haptic buttons can be activated on the haptic control panel. For example, a haptic control panel could display four floor buttons, six floor buttons, or any other number of floor buttons. Buttons other than floor buttons can also be displayed. Thus, different buttons can be activated on the haptic control panel and positioned individually.It is also possible to make the buttons larger or smaller depending on the usage situation. The haptic buttons provide the user with tactile feedback, allowing them to feel which button they are pressing. The haptic display can have a laminated safety glass surface. Different haptic buttons can be displayed on the haptic control panel depending on the situation. For example, haptic buttons for going up a floor and going down a floor could initially be displayed, and once a trip to a higher or lower floor has been selected, a selection of specific floors could be shown.By selectively activating haptic buttons in this way, the haptic buttons can each be made large, and a person with impaired vision can easily feel the buttons.
[0017] Generally, electrodynamic, electrotactile, or vibrotactile actuators are used to generate surface haptics. The simplest variant, already familiar from mobile phones, is vibration feedback when a button is pressed. However, in an optimized version, haptic feedback is generated based on the modulation of the frictional force and the simulation of the induced vibration between the surface and the finger. There are two basic methods for modulating the frictional force: the generation of ultrasonic vibrations and the generation of electro-vibrations. In the electro-vibration method, the coefficient of friction is increased by electrostatic attraction, while in the ultrasonic vibration method, it is reduced by creating an air film between a finger and a surface.To simulate induced vibrations on a haptic surface, vibrotactile methods can be used in addition to friction modulation techniques. Textures, and thus, for example, switch outlines, can also be displayed haptically on touch-sensitive displays.
[0018] It is possible that the main surface of the first side wall and / or the second side wall has two recesses. It is possible that a control panel is located between the recesses, essentially midway between the door and the end wall or another door. The control panel can be a haptic control panel as described above. If the control panel is a haptic control panel as described above, then it has the same advantages as described above. Furthermore, it is possible that the haptic control panel has the same design features as described above.
[0019] Positioning the control panel essentially midway between the door and the end wall or another door ensures that it is easily accessible to users. People with reduced mobility (PRM), such as wheelchair users or those who rely on a walker, have very limited movement and can only assume certain positions in an elevator car because a wheelchair or walker must also be accommodated. This positioning makes the control panel easily accessible for PRM users. This advantage applies regardless of whether the control panel is a tactile panel or one with mechanical buttons that cannot be repositioned.Regardless of whether the control panel is a haptic panel or one with mechanical buttons, it is easily accessible and tactile for a person with impaired vision thanks to the handrail. In addition to this advantage, further benefits arise, as described above, if the control panel is a haptic panel with variably programmable buttons. Therefore, the elevator car can be equipped with either a haptic panel or, alternatively, a panel with mechanical buttons, with the elevator car exhibiting the specific advantages of a haptic panel when one is installed.In particular, the advantages continue to have a synergistic effect, as a person with impaired vision is guided to the control panel by the handrail, thus enabling the identification of such a person by touching the edge of the control panel.
[0020] It is possible for the handrail to be arranged essentially within the recess. In this case, the handrail is completely within the recess, and the plane in which the main surface of the first side wall and / or the second side wall is located does not intersect the handrail. Such an arrangement of the handrail makes efficient use of the available space. Furthermore, users can remain in or move around the elevator car without the handrail obstructing their movement.
[0021] For a door with a side opening, the handrail is preferably located in the recess on the side of the opening. For a door that opens in the middle, the handrail is preferably located on the right side as viewed from the door. Similarly, the control panel is always located on the opening side or on the right if there is only one door.
[0022] The control panel may be tilted between 0° and 10° relative to the wall surface. It may be tilted between 1° and 8° relative to the wall surface. It may be tilted between 2° and 7° relative to the wall surface. It may be tilted at 3° relative to the wall surface.
[0023] With such an angled control panel, the user's hand doesn't have to be bent as sharply when operating it, making the control panel more comfortable to use. Furthermore, the angled control panel makes the symbols displayed on it easier for the user to see.
[0024] It is possible that the handrail leads directly to the control panel.
[0025] A user can then touch the handrail and feel their way along it to the control panel. This makes it easier for people with reduced vision to find the control panel in the elevator car. If the cutout is in a color contrast to the surface of one of the side walls, and this contrast is further enhanced by lighting, a person with impaired vision can, when the elevator door opens, recognize the cutout with the handrail by the color contrast, feel the handrail, and then feel their way along it to the control panel. This results in very good operability and usability of the elevator car for people with impaired vision.
[0026] The control panel can be positioned at a height of approximately 80-120 cm above the floor of the elevator car. This ensures easy access for all elevator users, especially PRMs.
[0027] It is possible that the control panel includes a speaker. It is possible that the control panel includes a microphone.
[0028] By installing a loudspeaker, it is possible to assist a person with impaired vision in operating the control panel. For example, the loudspeaker can announce the corresponding floor when the person touches a tactile control surface. If the person touches the tactile control surface for the second floor, the announcement "second floor" will be heard from the loudspeaker. This further simplifies the operation of the control panel in the elevator car for a person with impaired vision. If the control panel includes a microphone, it is possible to establish a voice connection between the elevator car and an emergency call center and / or a control center.For example, it is possible to establish a voice connection between the elevator car and a security service at a control center by pressing a button inside the car or based on certain usage patterns. This allows the security service to assist a visually impaired person with operating the control panel if they are having difficulty doing so. Furthermore, voice-controlled operation via a speaker and microphone is also possible.
[0029] It is possible that the surface haptic control panel is designed in such a way that different haptically recognizable buttons can be displayed depending on the status of the elevator car.
[0030] This optimizes and simplifies the display and operation of the control panel. For example, it allows for larger buttons that are easier to see and feel for people with visual impairments. Furthermore, it makes it possible, for instance, to first ask whether a passenger wishes to travel to a higher or lower floor. Once a passenger has selected the desired direction, the individual floors can then be displayed. Since fewer buttons are then required on the haptic control panel, the individual buttons can be made larger. This simplifies and improves usability for passengers, which is particularly beneficial for those with visual impairments.
[0031] Furthermore, it is possible to disable the display of destination buttons in case of fire or emergency.
[0032] It is possible that the elevator car contains a sensor and / or a camera. A wheelchair user could be detected using this sensor and / or camera.
[0033] A camera in the elevator car allows for the transmission of an image from inside to a control center. The image can be automatically analyzed and, using image recognition, the presence of a wheelchair user can be detected. A security guard in the control center can also determine if someone in the elevator car needs assistance and provide help via the camera and speaker. If a wheelchair user is already in the elevator car, a large portion of the interior space is already occupied, and there is little or no room for additional users. In this case, users attempting to enter the elevator car can be notified that it is full and should expect a longer wait.Furthermore, it is possible for the elevator car to travel directly from the starting point of the priority journey to its destination, without stopping on any additional floors. This direct journey is a priority journey. This prevents the elevator car from stopping on a floor where no further passengers can board because the car is already full. This avoids unnecessary stops, allowing the elevator car to quickly reach its priority destination and then pick up and transport additional passengers. Therefore, such an elevator car can be used in an elevator system that is particularly efficient and user-friendly.
[0034] The invention is further solved by an elevator system comprising an elevator car as described above and an elevator shaft. The elevator system includes a control unit. The elevator system can include a guide rail for the elevator car, which can be arranged between the control panel and a shaft wall.
[0035] The control system allows the elevator car to be steered within the shaft. The door openings and status of the elevator car can also be controlled by the control system.
[0036] By positioning the control panel in front of the guide rail, it is possible to utilize the space on both sides of the guide rail and the control panel for the recesses and the recessed handrail as described previously. This ensures optimal use of the available space.
[0037] If the guide rail is arranged between the control panel and the shaft wall as described above, then it can be a state-of-the-art control panel with conventional push buttons. However, it can also be a haptic control panel on which various haptic buttons can be activated. If the guide rail is not arranged between the control panel and the shaft wall, then the control panel is a haptic control panel on which various haptic buttons can be activated. It is possible that the elevator shaft includes door openings, with at least one floor control panel for requesting the elevator car located on the outer wall of a door opening, and the floor control panel including a haptic surface display.
[0038] A haptic floor control panel offers essentially the same advantages as a haptic display as previously described. With a haptic floor control panel, people with visual impairments can request the elevator car via the panel by feeling the haptic indicator on the display. This makes the elevator system comfortable to use for people with visual impairments.
[0039] It is possible that a floor control panel is located on an exterior wall of each doorway. In that case, a lift can be requested from any doorway by people with impaired vision.
[0040] The object of the invention is further achieved by a method for operating an elevator system as described above. In the method, the control unit controls the display on the control panel and, in particular, the floor display, and the control panel and / or the floor display has a standard mode and a support mode.
[0041] The standard mode is used for people without disabilities. The assistive mode is used for people with disabilities, such as visually impaired people or PRMs, like wheelchair users or people with a walker.
[0042] The standard mode and the assisted mode allow people without disabilities to use the elevator system as usual, while also ensuring comfortable use by people with disabilities. This makes the system highly versatile.
[0043] In this process, objectives displayed on the control panel and / or the floor plan can be represented visually and haptically as buttons. Haptic feedback can be provided when a button is touched. For example, two different pressures applied by a user to the button can be registered.
[0044] Haptic feedback allows a visually impaired user to feel which button their finger is on. This simplifies the operation of the control panel and / or floor control panel for visually impaired users. By registering different button presses, two different haptic responses can be triggered by the control panel and / or floor control panel. Upon the user's first button press, the control panel and / or floor control panel can send haptic feedback indicating which button the user's finger is on.For example, the button might vibrate twice briefly when the user's finger is on the second-floor button, or it might vibrate continuously in an alternating rhythm when the user's finger is on the alarm button. A second press of the button by the user can execute or trigger a corresponding command. For instance, if the user presses the second-floor button a second time, the elevator car will move to the second floor. If the user presses the alarm button a second time, an alarm call will be triggered.The two differently registered button presses allow the user to receive haptic feedback about the button their finger is on, and the system can then receive a command from the user. This makes the procedure particularly suitable for visually impaired users.
[0045] It is possible that the control system will switch the control panel and / or the floor display to assistive mode upon detection of a person with impaired vision. It is also possible that voice output will be activated in the elevator car and / or on the floor display upon detection of a person with impaired vision. Detection of a person with impaired vision can occur through the detection of touching an edge of the control panel.
[0046] This procedural step allows the process to automatically adapt to specific usage patterns. Therefore, the process is user-friendly and convenient for both fully and partially sighted users. Detecting a visually impaired user by touching the edge of the control panel is particularly useful because such individuals tend to feel for the panel along the handrail. They will therefore first feel for the panel's edge. This approach is not expected from a sighted person. Thus, when the edge of the control panel is touched, the system can switch to assistive mode and activate acoustic feedback.It is possible that when a person with impaired vision touches the control panel, haptic feedback and / or the button texture, such as the edges of the buttons displayed on the screen, are activated when a button is touched, and that an acoustic signal, for example, about the location of the elevator car, is simultaneously emitted. Surface haptics can also be activated in standard mode, as sighted people also benefit from haptic feedback on the position of their finger on the screen or on actually entering a floor destination.
[0047] A visually impaired user then receives both haptic and auditory feedback. This feedback is redundant or even enhanced, reducing the likelihood of the user missing information and thus increasing user-friendliness.
[0048] It is possible that by moving the finger from one displayed button to the next in support mode, haptic feedback is provided for each button; however, no input is registered with a simple touch, although input is registered as soon as the pressure is increased. It is also possible that increased pressure triggers a voice output related to the selected destination.
[0049] This process step provides the user with haptic feedback when touching buttons to help them select the correct one. When a button is pressed and thus activated, the user receives an audible confirmation. An audible announcement can also be made of the target currently being touched, so the user knows which target they are currently selecting. This process step ensures that the user can easily and quickly find the appropriate button and receive confirmation of its activation. This increases user comfort, as the user knows immediately that the corresponding command has been received and is being executed by the elevator system.
[0050] It is possible that when the user moves their finger from one displayed button to the next in assistive mode, acoustic feedback is provided for each button. This would provide the user with immediate audible feedback when swiping their fingers across the buttons, further enhancing the user's ability to operate the elevator system. It is also possible to represent the information content of the currently touched button, such as the destination floor, the alarm bell, or similar, through a texture, allowing the user to feel the displayed symbol. Displaying a texture in Braille is also conceivable, even though a standard number is visually displayed.
[0051] It is possible that in support mode, the displayed buttons of the control panel and / or the floor panel will be shown at the location on the control panel and / or the control panel where the fingers are registered on the display.
[0052] A visually impaired user can then touch a button as soon as they locate the control panel and receive immediate haptic and / or auditory feedback. They don't need to search for the displayed buttons with their finger on the screen; the display reacts to the touch and shows the buttons where the finger is currently touching the screen. It is then possible to display the next floors or, for example, a likely destination. In a building, this could be a doctor's office or similar frequently visited area. This method simplifies the operation of the elevator system for users with visual impairments.
[0053] This means that a user with impaired vision can touch the haptic control panel and immediately receive haptic feedback indicating a button is activated. The haptic button is activated precisely where the user with impaired vision touches it. Therefore, the user with impaired vision doesn't have to search for the haptic button; instead, they receive direct haptic feedback and can immediately activate it or select a different haptic button. This process significantly improves ease of use for users with impaired vision.
[0054] It is possible that a person with reduced mobility (PRM) will be detected in the elevator car, and the elevator system's control will switch to a PRM priority mode. The PRM could be a wheelchair user, a person with a walker, or a stroller.
[0055] A priority ride for passengers (PRM) is a direct journey from the PRM's starting floor to its destination floor, without the elevator car stopping on any other floor. This prevents the elevator car from stopping on an additional floor where no further passengers can board anyway, because the car is already fully occupied by the PRM. This avoids unnecessary stops, allowing the elevator car to quickly reach its destination and then transport other passengers. This procedure ensures that the elevator car moves quickly within the elevator system, the PRM reaches its destination floor rapidly, and the car is then available to other passengers as soon as possible. This procedure thus results in faster transport of the PRM, which benefits both the PRM and the other people who wish to use the elevator after the priority ride.
[0056] It is also possible that priority rides (PRM) are detected on each floor by a sensor or camera in front of the floor door. Alternatively, a separate PRM button can be displayed. When a PRM priority ride is activated on a floor control panel, boarding is no longer permitted on any other floor, and only the people currently in the cabin are transported to their destination. Destination selection is no longer possible on the other control panels or on the operator panel. The cabin then travels to the requested floor of the PRM priority ride, and the PRM can enter the cabin without hindrance and select their destination.
[0057] It is possible that the control system will switch the elevator system into an emergency call mode if an emergency call button is pressed on the control panel.
[0058] Then help can be quickly provided to a user of the elevator system.
[0059] It is possible that the emergency call button must be pressed for three seconds before the control system switches the elevator system to emergency call mode. In emergency call mode, a signal may appear on the control panel, for example, "Emergency call detected and sent." A corresponding haptic signal and / or an audible signal may also be generated. In emergency call mode, voice communication may be established between the elevator car and a control center and / or an emergency call center. The control system may indicate whether voice input is received after the initial voice communication. If no voice input is received, visual and / or haptic communication may be established via the control panel.For example, the control panel can be used to display visual and / or haptic yes / no questions with corresponding selection options, such as the question "Do you need help?" with the corresponding "Yes" and "No" buttons. This creates a two-sense emergency call that can be made both visually and haptically. This allows people with hearing impairments to make an emergency call and communicate with a control center and / or an emergency call center.
[0060] It is possible that in emergency mode, all floor panels not located at a main stop will display a message indicating that the elevator is not to be used. For example, the message might read: "Do not use elevator. Malfunction with person trapped. Help is on the way!"
[0061] A main stop is the stop where rescue teams have the best access to an elevator car and where elevator users can most easily escape, for example, in the event of a fire. The main stop can be on the ground floor. It is possible that the elevator car's position is displayed on the floor control panel at the main stop in emergency call mode. This allows rescue teams to quickly determine the car's position within the elevator system and dispatch assistance promptly. Upon acknowledging the emergency call at the elevator control panel, rescue teams may receive visual, audible, and / or haptic feedback indicating their arrival.
[0062] If an emergency situation is detected in the elevator car, for example by the camera via automatic image recognition or by a security service, the control system may send an automatic emergency call. It is also possible that if an emergency situation is detected in the elevator car, the control system may move the elevator car to a main stop.
[0063] An emergency situation could be, for example, a passenger falling or a fire. By traveling to the main stop, people in distress can be helped quickly.
[0064] It is possible that the control system will move the elevator car to the main stop upon receiving a fire alarm. It is also possible that the control system will automatically send an emergency call if people are detected in the elevator car during a fire. Furthermore, no destination areas will be displayed on the control panel when an automatic emergency call is sent. Similarly, no calls or destination selection will be possible on the floor panels.
[0065] Such a procedural step ensures that help can be reached as quickly as possible in the event of a fire and that people affected by the fire can be helped as quickly as possible.
[0066] The invention is explained in more detail in the following figures. Figure 1 shows a top view of a tiered tray.
[0067] Figure 2 shows a view of a floor table,
[0068] Figure 3 shows a view of an elevator system.
[0069] Figure 4 shows a view of an elevator system with a floor control panel.
[0070] Figure 5 shows a top view of a lift system.
[0071] Figure 6 shows a top view of an elevator system with a wheelchair user.
[0072] Figure 7 shows a top view of an elevator system with a user and a rollator.
[0073] Figure 8 shows a view of a control panel with a handrail, Figure 9 shows a view of a floor control panel,
[0074] Figure 10 shows a variant representation of a control panel, Figure 11 shows a variant representation of a control panel with a keypad,
[0075] Figure 12 shows a variant representation of a control panel with floor buttons,
[0076] Figure 13 shows a view of a control panel and a floor control panel.
[0077] Figure 14 shows a view of a control panel with a camera and a floor panel with a camera.
[0078] Figure 15 shows a flowchart of a process.
[0079] Figure 1 shows a top view of a floor control panel 22. The floor control panel 22 includes several haptic buttons 23, one of which is shown with a reference symbol on the display. The floor control panel 22 has a substantially rectangular base. The floor control panel 22 includes a display, and the displayed buttons are customizable. In the example shown, button 23 is a request for an upward journey. The floor control panel can include purely display elements and buttons with surface haptics that can be selected. The buttons 23 on the floor control panel 22 are thus individually customizable. For example, it is possible for the floor control panel 22 to display when the elevator car (not shown) is performing a priority journey or when the elevator system (not shown) is unusable in the event of a fire.Furthermore, it is possible that the floor panel 22 at a main stop displays the position of the elevator car (not shown), so that a rescue team can immediately recognize the position of the elevator car when entering the building with the elevator car (not shown).
[0080] Figure 2 shows a view of a control panel 22. The control panel 22 is designed like the control panel 22 from Figure 1. The control panel 22 is inclined at an angle 24 relative to the surface on which it is mounted. This inclination allows the haptic buttons 23 to be easily visible to a user when facing the control panel 22. This applies to both standing users and wheelchair users. Furthermore, the inclination makes the buttons easy to operate for both wheelchair users and standing individuals.
[0081] Figure 3 shows a view of an elevator system 35. The elevator system 35 has an elevator car 1. The elevator car 1 comprises an interior space 2, which is bounded by the end wall 4, the first side wall (not shown), and the second side wall 7. The interior space 2 can also be bounded by the door 3 when the door 3 is closed. In Figure 3, however, the door 3 is open, making the interior space 2 of the elevator car 1 visible. The opening of the door 3 forms the door opening 20. The second side wall 7 has a main surface 8. Two recesses 9 are cut into the main surface 8 of the side wall 7. A handrail 10 is arranged in each of the two recesses 9. The handrail 10 leads to the haptic control panel 11 on a display. Thus, a user with impaired vision can feel their way along the handrail 10 to the haptic control panel 11.This arrangement of the haptic control panel 11 in the area of the handrail 10 ensures comfortable use of the elevator system 35 by a user with impaired vision. The user with impaired vision can then feel the haptic control panel 11.
[0082] A user with impaired vision will initially locate the haptic control panel 11 by touch at its edge. Such behavior is not to be expected from a user without impaired vision. It is possible that the haptic control panel 11 recognizes, through the touch of the user with impaired vision at its edge, that it is being used by a user with impaired vision. The haptic control panel 11 can then activate a haptic button 23 at the point of contact. The user with impaired vision can then immediately locate the haptic button 23 and does not have to search for it. This increases the ease of use of the haptic control panel 11, allowing even a user with impaired vision to operate it quickly and easily.Thus, the haptic control panel 11 detects the position of a user's finger (not shown) and activates a haptic button 23 at precisely that location. It is possible that the haptic control panel 11 activates the haptic button 23 that is most likely to be activated. This can be programmed into the controller (not shown) or determined through empirical feedback within the controller.For example, if there is a basement level below the main level and several levels above the main level, the control system may be programmed to initially display a haptic button 23 for a trip to the upper levels when the elevator car 1 is on the main level. This is because, based solely on the plurality of upper levels and the singularity of the basement level, it is most likely that one of the upper levels will be the destination of a trip, assuming that all levels are visited with an equal probability, i.e., equally frequented.
[0083] It is also possible that the elevator system 35 counts the trips and, based on empirical data, calculates the probability of a trip going in a specific direction or to a specific floor, and activates a corresponding haptic button 11. Such an elevator system 35 intelligently adapts to user behavior. It is possible that the haptic buttons 23 are activated depending on the time of day. For example, if the elevator system's control system determines, based on empirical data, that a particular direction of travel or a specific floor is used particularly frequently at a certain time of day due to the users' habits, it is possible that the corresponding haptic buttons 23 are displayed and activated with priority at that time of day.In an office building, most users will travel from the main stop to one of the upper floors in the morning, and in the evening, most users will travel from one of the upper floors back to the main stop. The elevator system 35 can detect this behavior and activate the haptic buttons 23 on the haptic control panel 11 accordingly. The elevator system then "learns" from the users' usage patterns and adjusts the haptic buttons 23 on the haptic control panel 11 accordingly. This results in a highly positive user experience.
[0084] For example, if on a Wednesday evening most users of elevator system 35 want to travel to a specific floor because a weekly event, such as a music rehearsal, is taking place there, then elevator system 35 can prioritize displaying that floor on the haptic control panel 11 in the elevator car. An hour later, when people want to return from the floor where the event took place to the main stop, the haptic button 23 for the main stop can then be prioritized.
[0085] If new events are scheduled to take place in the building at a specific time on a specific day, then some users must first operate a haptic button 23 accordingly. Through empirical data in the control system, the elevator system 35 will then determine the new user behavior and activate the haptic buttons accordingly. Through user interaction with the haptic control panel, an elevator system is created that understands user behavior and adapts accordingly.
[0086] The haptic control panel 11 has a loudspeaker 12 and a microphone 13. The haptic control panel 11 also has buttons 23, one of which is shown with a reference symbol. The displayed buttons 23 are customizable. Thus, different buttons 23 can be displayed depending on the usage situation. The elevator system 35 has an elevator shaft 16. The elevator shaft 16 has a shaft wall 17. The floor control panel 22 is located on the outer wall 21 of the door opening 20. The floor control panel 22 includes buttons 23, one of which is shown with a reference symbol. The floor control panel 22 is also a display with haptic feedback.
[0087] Figure 4 shows a view of a lift system 35 with a floor control panel 22 analogous to Figure 3. Unlike in Figure 3, the surface of the recess 9 is painted in a light color, which contrasts with the main surface 8 of the second side wall 7, which is painted in a dark color. Furthermore, the recess 9 is passively illuminated, which increases the contrast between the surface of the recess 9 and the main surface 8 of the second side wall 7. Thus, the recess 9 is easily visible to a user with impaired vision, allowing the handrail 10 in the recess 9 to be quickly located by touch and the haptic control panel 11 with the haptic buttons 23 to be quickly reached.
[0088] Figure 5 shows a top view of a section through an elevator system 35. The elevator system 35 comprises an elevator car 1 and an elevator shaft 16. The elevator car 1 has an interior space 2. The interior space 2 is bounded by the end wall 4, the first side wall 6, the second side wall 7, and the door 3. The elevator shaft 16 has a shaft wall 17. The second side wall 7 of the elevator car 1 has a main surface 8. A recess 9 is formed in the main surface 8 of the second side wall 7. The handrail 10 is arranged in the recess 9. The handrail 10 leads to the haptic control panel 11. The guide rail 19 is formed between the control panel 11 of the elevator car 1 and the shaft wall 17 of the elevator shaft 16. Thus, the recess 9 for the handrail 10 can be recessed towards the shaft wall 17 and the space in the interior 2 is optimally utilized.This allows people with disabilities using a wheelchair or walker to use the elevator system 35, and the recess 9 with the handrail 10 makes the elevator system 35 comfortable and easy to use for people with visual impairments. The elevator car 1 has a door opening 20, which is closed by the door 3. Outside the door opening 20, the outer wall 21 of the door opening 20 is formed. The control panel 11 can be a haptic display or a conventional push-button panel.
[0089] Figure 6 shows a top view of an elevator system 35 analogous to Figure 5. Unlike Figure 5, Figure 6 shows a user 36 in a wheelchair 37 inside the interior 2 of the elevator car 1. The haptic control panel 11 is positioned centrally between the end wall 4 and the door 3. This makes the control panel 11 easily accessible to the user 36 in the wheelchair 37. The door 3 opens to the right and opens to the left. Therefore, the control panel 11 is also located to the right of the door opening. This allows the user 36 to quickly identify the control panel when standing in front of the door 3 and it opens.
[0090] Figure 7 shows a top view of an elevator system analogous to Figures 5 and 6. Unlike in Figure 6, the user 36 is equipped with a rollator 38. The haptic control panel 11 is positioned centrally between the end wall 4 and the door 3. This allows the user 36 with the rollator 38 to easily reach the control panel 11. Figure 8 shows a view of a display with a surface-haptic control panel 11 and a handrail 10. The handrail 10 is arranged in the recess 9. The handrail 10 leads to the haptic control panel 11. This allows a person with impaired vision to reach the haptic control panel 11 by feeling for it in the recess 9. The haptic control panel 11 includes a loudspeaker 12 and a microphone 13.The displayed buttons 23 on the haptic control panel 11 are customizable, and the edges of the buttons 23 are perceptible by means of surface haptics on the display. The haptic control panel 11 has a close button 29, an alarm button 30, and an open button 31. Furthermore, the haptic control panel 11 has several buttons 23, one of which is marked with a reference symbol. Some of the buttons 23 are designed as floor buttons 28. One of the buttons 23 is designed as a main stop button 32. The main stop button 32 has a more pronounced border 33, which makes it perceptible by touch. The haptic control panel 11 has an antenna 26 and an emergency light 25. The emergency light 25 is located in the area of the individual zone 27. In the individual area 27, information can be displayed individually.The antenna 26 allows the selection of a destination using a badge containing electronic information. Furthermore, the emergency light 25 can be displayed in the individual area 27. The control panel 11 also features two key switches 39, which only grant access to these floors to persons with a key corresponding to the respective key switch 39. It is possible that the haptic control panel 11 includes both permanently installed mechanical switches and haptic buttons 23, which are individually displayed in an individual area 27. It is also possible that the haptic control panel 11 comprises exclusively haptic buttons 23, which are individually displayed.
[0091] Figure 9 shows a view of a floor panel 22. The floor panel 22 has a loudspeaker 12. It also has an antenna 26 and a customizable area 27. Information can be displayed individually in the customizable area 27. The floor panel 22 has a microphone 13 and a sensor 14. The sensor 14 can be a proximity sensor. In that case, the proximity sensor can detect the approach and / or presence of a user (not shown) in front of the floor panel 22. It is possible that the floor panel 22 is in standby mode when no user is approaching or in front of it. An approaching user will then be detected by the proximity sensor 14. The proximity signal from the proximity sensor 14 then switches the floor panel 2 from standby mode to an active mode, in which the floor panel 22 can be operated by the user.The shelf panel 22 has two buttons 23. Each of the two buttons 23 has a tactile border 33. The buttons 23 can be felt thanks to the tactile border 33. The shelf panel 22 is also equipped with a microphone 13.
[0092] Figure 10 shows a possible configuration of a haptic control panel 11. The haptic control panel 11 includes a close button 29, an alarm button 30, and an open button 31. It also includes a customizable area 27 in which information can be displayed individually. Haptic buttons 23 can be displayed individually in the customizable area 27. This results in individual configurations and operating options for the haptic control panel 11, which can be activated depending on the usage situation. Eighteen haptic buttons 23 are arranged in the customizable area 27. The haptic buttons 23 of the customizable area 27 are positioned above the close button 29, the alarm button 30, and the open button 31. The lock button 29, the alarm button 30 and the open button 31 are arranged next to each other.Above the close button 29, the alarm button 30, and the open button 31, a row of 6 haptic buttons 23 is arranged in the individual area 27j. The haptic buttons 23 are thus arranged in a field of three by six haptic buttons 23. Three by seven or three by eight would also be possible, depending particularly on the display size.
[0093] Figure 11 shows a representation of a haptic control panel 11 with a keypad. The haptic control panel 11 includes a close button 29, an alarm button 30, and an open button 31. The haptic control panel 11 also includes a customizable area 27 in which information can be displayed individually. Haptic buttons 23 can be displayed individually in the customizable area 27. This results in individual display and operating variations of the haptic control panel 11, which can be activated depending on the usage situation. Twelve haptic buttons 23 are arranged in the customizable area 27. The haptic buttons 23 of the customizable area 27 are arranged above the close button 29, the alarm button 30, and the open button 31.The haptic buttons 23 in the individual area 27 are configured as a numeric keypad with a star key and a dash key. The close button 29, the alarm button 30, and the open button 31 are arranged side by side. Above the close button 29, the alarm button 30, and the open button 31, a row of four haptic buttons 23 is arranged in the individual area 27. The haptic buttons 23 are thus arranged in a three-by-four grid. The first, top row of the numeric keypad comprises, from left to right, the digits one, two, and three. The second, second-from-top row of the numeric keypad comprises, from left to right, the digits four, five, and six. The third, third-from-top row of the numeric keypad comprises, from left to right, the digits seven, eight, and nine.The fourth, fourth-from-top row of the numeric keypad includes, from left to right, the star key, the digit zero, and the dash key.
[0094] Figure 12 shows a representation variant of a haptic control panel 11 with floor buttons. The haptic control panel 11 includes a close button 29, an alarm button 30, and an open button 31. Furthermore, the haptic control panel 11 includes a customizable area 27 in which information can be displayed individually. Haptic buttons 23 can be displayed individually in the customizable area 27. This results in individual representation and operating variants of the haptic control panel 11, which can be activated depending on the usage situation of the haptic control panel 11. The customizable area 27 is arranged above the close button 29, the alarm button 30, and the open button 31. The close button 29, the alarm button 30, and the open button 31 are arranged next to each other.The floor keys comprise the digits -1, 0, 1, 2, 3, 4, 5, arranged in ascending order with -1 at the bottom and 5 at the top. A user's finger 34 (not shown) is formed at the edge of the haptic control panel 11. Finger 34 touches the edge of the haptic control panel 11. This touching of the edge by the user's finger 34 allows the haptic control panel 11 to detect that it belongs to a user with a visual impairment, as a user without a visual impairment would not be expected to touch the edge of the haptic control panel 11.When a user with a visual impairment is detected by the haptic control panel 11, the haptic buttons 23 can, for example, be displayed larger and a speech output can be activated which signals a corresponding voice announcement when a haptic button 23 is touched.
[0095] Figure 13 shows a layout of a haptic control panel 11 and a floor display 22 for people with visual impairments. The haptic display 11 is structured analogously to the haptic display in Figure 12. The haptic display 11 includes a close button 29, an alarm button 30, and an open button 31. Both the haptic control panel 11 and the floor display 22 include a customizable area 27 in which information can be displayed individually. The floor buttons 28 are arranged one above the other in the customizable area 27 of both the haptic control panel 11 and the floor display 22. This makes the haptic floor buttons 28 easily tactile for a visually impaired or blind person, allowing them to conveniently select a target floor to which they wish to travel in the elevator car (not shown).The floor buttons of the haptic control panel 11 and the floor display 22 comprise the digits -1, 0, 1, 2, 3, 4, 5, with the floor buttons arranged one above the other in ascending order, with -1 at the bottom and 5 at the top. Figure 14 shows a view of a haptic control panel 11 with a camera 15 and a floor display 22 with a camera 15. The floor display 22 is designed analogously to the floor display 22 from Figure 9. Unlike in Figure 9, the floor display in Figure 12 does not include a microphone 13. The haptic control panel 11 has a customizable area 27 in which information can be displayed individually. The customizable area 27 includes the close button 29, the alarm button 30, and the open button 31. Furthermore, the floor buttons 28 are provided in the individual area 27.The lock button 29, the alarm button 30, and the open button 31 are arranged side by side in the lower section of the haptic control panel, with the lock button 29 on the far left, the alarm button 30 in the center, and the open button 31 on the right. The floor buttons comprise the digits -1, 0, 1, 2, 3, and 4 and are arranged vertically in ascending order, with -1 at the bottom and 4 at the top. The floor buttons are positioned vertically above the alarm button 30.
[0096] Figure 15 shows a flow diagram of a procedure which can be carried out with an elevator system (not shown).
[0097] The procedure can proceed as described below, for example.
[0098] If a person with impaired vision wishes to use the elevator system, the procedure in the elevator car may proceed as follows, for example: A: The person with impaired vision feels their way along the handrail to the haptic control panel and feels the housing or the edge of the haptic control panel.
[0099] B: Identification of a visually impaired user via the haptic control panel, because the edge of the haptic control panel is detected by touch. Activation of the haptic buttons and speech output. C: When the visually impaired user touches a specific button with an initial press, identification of the touched button via speech output and haptic feedback.
[0100] D: Upon registration of a second operating pressure, acceptance of a command from the visually impaired user by the haptic control panel.
[0101] E: Confirmation of the command by haptic feedback from the haptic control panel and by voice output.
[0102] Q: Optional, displaying the activated button as "pressed", for example by a red border.
[0103] E: Optional, display of the direction of travel and the next stop on the haptic control panel.
[0104] If a person with impaired vision wishes to use the elevator system, the procedure in front of the elevator car can proceed as follows, for example:
[0105] A: Optional: Detection of a person in front of the floor panel by a sensor and activation of the floor panel.
[0106] B: The person with impaired vision feels the casing of the floor panel.
[0107] C: Identification of a visually impaired user via the floor panel by tactile detection of its edge. Activation of the floor panel's haptic buttons and speech output. D: When the visually impaired user touches a specific button with an initial press, identification of the touched button is achieved through speech output and haptic feedback.
[0108] E: Upon registration of a second operating pressure, acceptance of a command from the visually impaired user by the floor control panel.
[0109] F: Confirmation of the command by haptic feedback from the floor panel and by a speech output.
[0110] If a person who is not impaired wishes to use the elevator system, the procedure in front of the elevator car can proceed as follows, for example:
[0111] A: Floor panel not activated.
[0112] B: Detecting the approach of a user using a sensor.
[0113] C: Activation of the floor panel and display of buttons.
[0114] D: When the user touches a specific button with an initial press, the touched button is identified by haptic feedback, for example, a slow pulse sequence for the "up" button and a fast pulse sequence for the "down" button. Optionally, additional voice output is provided.
[0115] E: Upon registration of a second operating pressure, acceptance of a user command by the floor control panel.
[0116] F: Confirmation of the command by haptic feedback from the floor panel and optionally by speech output.
[0117] G: Optional, displaying the activated button as "pressed", for example by a red border. H: Optional, displaying the direction of travel and / or the location of the elevator car and / or the waiting time and / or the car occupancy.
[0118] If a person who is not impaired wishes to use the elevator system, the procedure in the elevator car can proceed as follows, for example:
[0119] A: Identification of a person by a sensor. Activation of the haptic buttons of the haptic control panel.
[0120] B: When the visually impaired user touches a button with an initial press, send haptic feedback, for example a short pulse sequence, preferably with a different pulse sequence being given at the main stop than at the other stops.
[0121] C: Holding a button down for a longer period of time enlarges the button on the haptic control panel.
[0122] D: Upon registration of a second user press and subsequent removal of the user's finger from the haptic control panel, the haptic control panel accepts a user command.
[0123] E: Upon registration of a second press of the user's finger and subsequent retention on the haptic display, the haptic control panel does not accept a command from the user.
[0124] Q: Optional, displaying the activated button as "pressed", for example by a red border.
[0125] E: Optional, display of the direction of travel and the next stop on the haptic control panel.
[0126] If a PRM, for example a wheelchair user, wishes to travel using the elevator system, the procedure in front of the elevator car can proceed as follows: A: Optional, detection of a wheelchair user by a camera in the area of the floor control panel.
[0127] B: When a priority trip is triggered inside the elevator car, the floor panels will display an indication that a priority trip has been triggered and the elevator car is temporarily reserved, for example by the message "Elevator is temporarily reserved. Please wait or use the stairs."
[0128] If a PRM, for example a wheelchair user, wishes to travel using the elevator system, the procedure in the elevator car can proceed as follows:
[0129] A: Identification of a PRM by a sensor in the elevator car, in particular by a camera.
[0130] B: Input of a command by the PRM on the haptic control panel.
[0131] C: Initiating a priority trip. Direct movement of the PRM with the elevator car to the target floor without intermediate stops. D: Optional: Opening the door and transmitting an image from a camera in front of the floor panel on the respective floor to the haptic control panel, so that the PRM can see on the haptic control panel whether there are any obstacles behind it.
[0132] If an emergency call is made in the elevator car, the procedure in the elevator car can proceed as follows:
[0133] A: Detection of an emergency call via the haptic control panel, preferably by pressing the alarm button for more than 3 seconds. B: Hiding all floor buttons on the haptic control panel, displaying a signal that the emergency call has been detected and placed.
[0134] C: Establishing voice communication between the elevator car and an emergency call center, in particular by sounding an acoustic signal in the elevator car until the voice connection is established.
[0135] D: Displays on the haptic control panel indicating that voice communication was built on it.
[0136] E: If no voice input is available in the elevator car, emergency communication will be displayed on the haptic control panel. For example, yes / no questions such as "Do you need help?" can be displayed, with the respective answers "yes" and "no" shown on corresponding haptic buttons.
[0137] Q: Optional, displaying data from the elevator system on the haptic control panel, for example, displaying the location of the elevator car.
[0138] G: When emergency personnel acknowledge the command at the control panel, the haptic control panel will display an indication that help is on site, for example, the message "Help on site. Remain calm."
[0139] If an emergency call is made inside the elevator car, the procedure outside the elevator car can proceed as follows:
[0140] A: Displays on floor panels not located on the main stop floor indicating that the elevator is out of service, for example, the display "Do not use elevator. Malfunction with person trapped. Help is on the way."
[0141] B: Displays on the main floor panel indicating the location of the elevator car with the trapped passenger. C: Upon acknowledgment at the control panel by emergency personnel, displays indicating that work is being carried out on the elevator system, for example, the message "Out of service. We are working on your system."
[0142] If a person falls inside the elevator car, the procedure in front of the elevator car can proceed as follows:
[0143] A: Displays on the floor panels indicating that the elevator is out of service.
[0144] If a person falls in the elevator car, the procedure inside the elevator car can proceed as follows:
[0145] A: Detecting a person's fall using a sensor. B: Triggering an emergency call, whereby the emergency call is preferably first sent to a defined location, for example a reception area, and is then sent to an emergency call center if the defined location does not acknowledge the emergency call.
[0146] C: Direct procedure of the cabin into the main stop and opening of the door.
[0147] D: Optional, detection that no person is left in the cabin and cancellation of the emergency call.
[0148] If a fire is detected in the building with the elevator system, the procedure in front of the elevator car can proceed as follows:
[0149] A: Displays on the floor panels indicating that a fire has occurred, for example by displaying "Fire! Do not use elevator!" If a fire is detected in the building with the elevator system, the procedure in the elevator car can proceed as follows:
[0150] A: Triggering a fire alarm signal in the elevator car or receiving a fire alarm signal by the control system.
[0151] B: Hide all buttons on the haptic control panel, except for the main stop button.
[0152] C: Indication of a fire alarm on the haptic control panel, for example by displaying: "Fire alarm, remain calm, the elevator car is traveling directly to the main stop. Please leave the building quickly afterwards."
[0153] D: Direct movement of the elevator car to the main stop without intermediate stops and opening of the door.
[0154] E: Optional, detecting via a sensor whether there are still people in the cabin.
[0155] F: Optional, upon detection of persons in the cabin, triggering an emergency call.
[0156] The procedures are shown as examples. The sequence of steps may differ from that shown in each procedure. It is possible that steps within a procedure may be exchanged, that a procedure may be supplemented with a step from another procedure, or that steps within a procedure may be omitted. For example, a priority ride (PRM), such as a wheelchair user, may also be visually impaired. In this case, steps from both the PRM procedure ("Priority Ride") and the procedure for a visually impaired person will be executed. It is also possible that an emergency, such as a fire, occurs while another procedure is in progress. In this case, the currently executed procedure will be supplemented with steps from the "Emergency" procedure.
Claims
Patent claims 1. On train cabin (1) comprising an interior space (2) wherein the interior space (2) is bounded by a door (3) and an opposite end wall (4) or a further door, a first side wall (6) and a second side wall (7) opposite the first side wall (6), characterized in that a haptic control panel (11) is arranged in the interior space (2) wherein the haptic control panel (11) comprises a surface haptic or a mechanical button (23).
2. On train cabin (1), in particular according to claim 1, comprising an interior space (2), wherein the interior space (2) is bounded by a door (3) and an opposite end wall (4) or a further door, a first side wall (6) and a second side wall (7) opposite the first side wall (6), wherein the first side wall (6) and / or the second side wall (7) has a main surface (8), characterized in that the main surface (8) has at least one recess (9) and a handrail (10) is arranged in the recess (9), wherein the handrail (10) is in particular arranged horizontally.
3. On train cabin ( 1 ) according to one of the preceding claims , characterized in that the main surface ( 8 ) has two recesses ( 9 ) and in particular between the recesses ( 9 ) substantially in the middle between door ( 3 ) and end wall ( 4 ) or the further door a control panel ( 11 ) is arranged, in particular a haptic .
4. On train cabin ( 1 ) according to one of the preceding claims 2 - 3 , characterized in that the recess ( 9 ) is such that is designed such that the handrail ( 10 ) can be arranged essentially within the recess ( 9 ).
5. On elevator cabin ( 1 ) according to one of the preceding claims , characterized in that the surface haptic control panel ( 11 ) is designed such that, depending on the status of the elevator cabin ( 1 ) other haptically recognizable buttons ( 23 ) can be displayed .
6. Elevator system (35) comprising an elevator car (1) according to one of the preceding claims as well as an elevator shaft (16), a control (18) and in particular a guide rail (19) for the elevator car (1) which is arranged between control panel (11) and a shaft wall (17).
7. Elevator system (35) according to claim 6, characterized in that the elevator shaft (16) comprises door openings (20), wherein at least on an outer wall (21) of a door opening (20) a floor panel (22) for requesting the elevator cabin (1) is arranged, wherein the floor panel (22) comprises a surface haptic display (11).
8. Method for operating an elevator system (35) according to one of claims 6-7 wherein the control (18) controls the display on the control panel (11), characterized in that the control panel (11) and / or the floor panel (22) comprises a standard mode and an assist mode.
9. Method according to claim 8, characterized in that targets displayed on the control panel (11) and / or on the floor panel (22) are visually represented as buttons (23) and haptic feedback is provided when a button (23) is touched, wherein in particular at least Two button presses of different strengths by the user (36) are registered.
10. Method according to one of the preceding claims 8-9, characterized in that the control (18) upon detection of a person with impaired vision switches the control panel (11) and / or the floor panel (22) into support mode and in particular activates a voice output in the elevator car (1) and / or at the floor panel (22), wherein the detection of the person with impaired vision takes place in particular by detection of a touch on an edge of the control panel (11).
11. Method according to claim 10, characterized in that when the control panel ( 11 ) is touched by the person with impaired vision, haptic feedback is activated when a button (23) is touched and acoustic information is simultaneously output.
12. Method according to claim 10 or 11, characterized in that by moving the finger (34) in support mode from one displayed button (23) to the next, haptic feedback is given for each button (23), however, no input occurs with mere touch, wherein an input occurs as soon as the pressure is increased, wherein in this case in particular a speech output to the selected target occurs.
13. Method according to one of claims 10-12, characterized in that in support mode the displayed button (23) of the control panel (11) and / or the floor panel (22) is located at the position on the control panel (11) and / or the floor table ( 22 ) where the fingers ( 34 ) are registered on the display ( 11 ).
14. Method according to one of the preceding claims 8-13, characterized in that a person with reduced mobility (PRM), in particular a wheelchair user, is detected in the elevator cabin (1) and the control (18) switches the elevator system (35) into a PRM priority mode.
15. Method according to one of the preceding claims 8-14, characterized in that if an emergency situation is detected in the elevator car ( 1 ), the control ( 18 ) sends an automatic emergency call and in particular the elevator car ( 1 ) travels to a main stop .
Citation Information
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