EP2253570A1 - Guidage d'un utilisateur d'ascenseur - Google Patents

Guidage d'un utilisateur d'ascenseur Download PDF

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Publication number
EP2253570A1
EP2253570A1 EP09160810A EP09160810A EP2253570A1 EP 2253570 A1 EP2253570 A1 EP 2253570A1 EP 09160810 A EP09160810 A EP 09160810A EP 09160810 A EP09160810 A EP 09160810A EP 2253570 A1 EP2253570 A1 EP 2253570A1
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EP
European Patent Office
Prior art keywords
audio
unit
elevator
control unit
user
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09160810A
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German (de)
English (en)
Inventor
Hugo Felder
Dennys Taiana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inventio AG
Original Assignee
Inventio AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inventio AG filed Critical Inventio AG
Priority to EP09160810A priority Critical patent/EP2253570A1/fr
Publication of EP2253570A1 publication Critical patent/EP2253570A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
    • B66B3/002—Indicators
    • B66B3/006—Indicators for guiding passengers to their assigned elevator car

Definitions

  • the invention relates to a method and a device for guiding a user of an elevator installation in a fault or dangerous situation.
  • An elevator installation is typically installed in a shaft. It usually consists of a cabin, which is connected via suspension with a counterweight. By means of a drive, which acts on the suspension means on the car or the counterweight, the car is moved along a vertical car lane and thus conveys a user of the elevator system between floors of a building.
  • each elevator installation is assigned an elevator control, to which sensors and actuators, such as operating, actuating and adjusting elements of the elevator installation are connected.
  • the elevator control usually contains a microprocessor which receives signals or data from other units of the elevator installation, evaluates them and sends the output signals to the corresponding elevator units.
  • An elevator car usually also has an audio-visual communication unit connected to the elevator control, which can be combined with the operating, actuating and adjusting elements in one unit.
  • the audio-visual communication unit consists of at least one audio unit for outputting audio sequences, a display unit, e.g. As video unit, screen, display, dot-matrix display, etc., for outputting a visual information and a communication unit for bi- or unidirectional communication via the elevator control with another communication unit, for.
  • a service point e.g. As video unit, screen, display, dot-matrix display, etc.
  • a communication unit for bi- or unidirectional communication via the elevator control with another communication unit, for.
  • B a service point, a so-called call center, a communication unit in the maintenance room, a mobile terminal, a communication terminal etc.
  • the audio-visual communication unit may additionally actuators to operate the elevator and is in this form as an elevator control unit or Landing Operating Panel ( LOP) or Car Operating Panel (COP).
  • LOP Landing Operating Panel
  • COP Car Operating Panel
  • the LOP is outside the elevator car on one floor and the COP is located in the elevator car.
  • the individual units of the elevator control unit can also be arranged separately in the elevator car or on the floor and connected to the elevator control.
  • the object of the present invention can be seen in the fact that a solution for an efficient guidance of a user of an elevator in a situation of disturbance or danger is proposed.
  • a core of the invention is that in a situation of disturbance or danger, a user of an elevator installation is guided by a disturbance or danger procedure created by the control unit.
  • the elevator installation either in the elevator car or on at least one floor of the building, in which the elevator installation is located, has at least one audio-visual communication unit which is connected via at least one communication network to at least one control unit of the elevator installation.
  • At least one detection unit is likewise connected to the at least one control unit via at least one further communication network.
  • a fault or danger situation is detected by the detection unit, data are sent to the at least one control unit. This evaluates the data and uses the result of the evaluation to create a fault or danger procedure. It is conceivable that the data are evaluated as a function of at least one first rule. In this case, a comparison of the data obtained by the detection unit with data and / or at least one threshold value can be used as at least one first rule. This data and / or the at least one threshold value can be stored in a memory unit of the at least one control unit. Also, the type, the possible risk to the user of the elevator, the effect on the elevator system, the current load of the elevator, the location of the elevator, etc. can be used as a criterion for the first rule. The rules created from these criteria depend on the individual results that are to be achieved. For example, a rule could be that with an empty elevator car, the time to repair the fault may be longer and thus has a lower priority than a fault in an occupied with persons elevator car.
  • Under interference or hazard procedure for example, a situation-dependent schedule for an evacuation of the user of the elevator, a control of communication between the user and a service center, a measure to calm the user, a measure to bridge the waiting time between the occurrence of sturgeon or dangerous situation and the implementation
  • Rescue measures, preparation of a timetable for the rescue and rescue measures and the initiation of rescue and / or assistance measures eg communication setup with a service center, arrival of service personnel, fire brigade, building service, etc.
  • the fault or danger procedure is created on the basis of the evaluation result.
  • at least one more rule could be used to create the disturbance or hazard procedure.
  • the current location of the elevator car, the time, the state of the exit point, the time of arrival of help or rescue, the behavior of the user of the elevator after leaving the elevator car or the elevator eg. follow the arrows, go to the left, go to the meeting point, etc.
  • the condition of the elevator system, the number of persons in the elevator car, the condition of the persons etc. are used as criterion.
  • the rules created with the help of the criteria can be arbitrary. For example, a rule could also be that when detecting a sick person in the elevator in addition to the service technician and an ambulance is called.
  • the rules (first, further and third rule) can be designed so that it can be queried whether a previously defined event (eg a threshold, a parameter, a date, a state, etc.) is true or false ,
  • the user may be directed or requested to report during reception or to use another elevator or escalator to reach his destination. For example, he can also be shown the direction in which he should move.
  • At least one at least partially animated visual sequence containing at least one instruction is then transmitted to the audio-visual communication unit for the user of the elevator installation.
  • the user of the elevator is with the at least one sequence to act such. For listening, speaking, leaving the elevator, waiting a certain or indefinite period of time, keep calm, Suffering of a situation, etc. prompted.
  • the at least partially animated sequence can thus also be used, for example, to bridge the waiting time between the detection of an accident or dangerous situation and the initiation of rescue and / or assistance measures.
  • a detection unit a sensor unit, a manual fault or danger alarm unit, a hazard alarm unit, such as a fire detector, a gas detector, a seismograph or seismometer, etc. can be used.
  • a hazard alarm unit such as a fire detector, a gas detector, a seismograph or seismometer, etc.
  • the at least one detection unit can be located in the elevator shaft, in the elevator car and / or outside the elevator shaft, such as in the building where the elevator installation is located, in a warning center outside the building, etc. If several detection units are used, they can also be connected to each other via a communication network. The connection of the individual detection units can be done both serially and in parallel.
  • an animated visual sequence a video clip, an image sequence of at least two consecutive images, an at least partially animated icon, or the like may be used.
  • an audio sequence may also be transmitted from the control unit to the audio-visual communication unit. Of course, this can be done synchronously with the animated sequence so that an audio-visual sequence is provided to the user. If an input is made at the audio-visual communication unit, at least one further at least partially animated sequence is transmitted from the control unit to the audio-visual communication unit as a function of this input.
  • the audio-visual communication unit has at least an audio unit, a video unit and a communication unit. It may also have an operating unit for operating the elevator.
  • Any communications network such as, for example, circuit-switched and packet-switched communications networks, radio communications networks, bus systems, etc., can be used or used as the communications network.
  • the audio-visual communication unit is arranged in the elevator car, connected via at least one communication network with at least one control unit of the elevator system and has an operating unit for operating the elevator, for.
  • an operating unit for operating the elevator for.
  • buttons, switches, buttons, a touch-sensitive display element or a touch-sensitive image output device a so-called touch screen
  • the audio-visual communication unit has an image output unit for outputting at least one at least partially animated sequence, an audio output unit for outputting voice and audio sequences, and an image and an audio control unit for controlling the image and audio sequences.
  • the image and the audio control unit are arranged on a circuit board.
  • an audio control unit for example, an mp3 player module can be used, and the image control unit is arranged to process signals for high-resolution image output devices and to drive the image output device accordingly.
  • the combination of image and audio control unit on a circuit board it is possible that the housing of the audio-visual communication unit can be significantly reduced, since no space for a second circuit board is required.
  • the audio output unit such as a loudspeaker, can be miniaturized and thus fits into even the smallest housing dimensions.
  • the image and audio output units are each connected via an interface with the image and audio control unit.
  • the image output unit is connected to the image control unit via an interface of the circuit board and the audio output unit is connected to the audio control unit via a further interface of the circuit board.
  • the interfaces can be identical or not identical. Basically, the design of the interface is arbitrary. This is for example the replacement of damaged, obsolete, etc. picture and audio output units particularly simple.
  • At least one piece of information is displayed in a display area of an image output unit of an audio-visual communication unit of an elevator installation.
  • the ad area can represent the entire ad area or just part of the ad space of the image output unit.
  • the highlight may depend on at least one third rule.
  • the screen of the image output unit can be subdivided into at least two display areas or into so-called frames.
  • Each ad area displays at least one piece of information. It can display a wide variety of information, such as the weather, stock market report, time, next stop, selected floors, alarm, destination floor information, personal information, location, date, overload, etc.
  • the operating state such as a normal operation, an emergency operation, a fault-related operation, operation in a dangerous situation, etc. and the at least one third rule either the at least one information in a display area or at least one display area is highlighted.
  • the at least one third rule for example, a priority in the case of a fault or dangerous situation, the person using the lift, the proximity to the destination floor, etc., can be used. This can ensure that the information or instruction relevant to the user of the elevator can be displayed in the relevant operating state of the elevator installation.
  • a user of an elevator installation can be guided efficiently and thus the risk of a panic of the user can be minimized.
  • the user in the elevator car is not only informed, but also receives specific instructions that convey to him that assistance and rescue measures are already in progress and that the system has the incident or dangerous situation under control.
  • parameters and the current situation in the elevator installation or in the building in which the elevator installation is located are taken into account, so that the assistance and rescue operations that are initiated do not lead to a deterioration of the situation of the user of the elevator. For example, if the ground floor is no longer accessible due to heavy smoke in a fire, the evacuation of the user of the elevator system can not be done on the ground floor.
  • FIG. 1 shows a simplified schematic representation of an elevator system.
  • the other components of the elevator system such as the drive, the counterweight, the maintenance room, the rails, etc. have been omitted for reasons of clarity.
  • An elevator car AK is in the vertical direction between the individual floors SW of a building in an elevator shaft S emotional.
  • an audio-visual communication unit KE is arranged in the elevator car AK.
  • Other audio-visual communication units KE are installed on each floor SW of the building in this example.
  • This communication unit KE can represent a unit or have a plurality of separately arranged components which are connected either to one another or to at least one control unit SE of the elevator installation.
  • the communication unit KE may, for example, be fastened to a wall of the elevator car KE and / or integrated into a further component of the elevator car AK, such as a handle, an operating unit BE, a unit for illumination, a cowl of the elevator car AK, etc.
  • the audio-visual communication unit KE is connected to the at least one control unit SE of the elevator installation via a communication network KN, such as, for example, a circuit-switching, a packet-switching or a radio communication network or a bus system.
  • a communication network KN such as, for example, a circuit-switching, a packet-switching or a radio communication network or a bus system.
  • At least one detection unit DE1, DE2, DE3 is connected to the at least one control unit SE via a further communication network KN2, which may likewise be, for example, a circuit-switching, a packet-switching or a radio communication network or a bus system.
  • the at least one detection unit DE1, DE2 can be arranged, for example, in the elevator shaft S and / or in the elevator car AK and the at least one detection unit DE3 can also be, for example, a detection unit DE3 of a danger detection system of the building in which the elevator installation is located or a detection unit DE3 of a not to the elevator installation or to the building belonging danger detection system such as a tsunami warning system, an earthquake warning system, etc.
  • detection unit DE1, DE2, DE3 any unit can be used which is suitable for detecting a fault or a danger or triggering a message of a fault or a hazard.
  • a sensor unit, a hazard alarm unit, a video surveillance unit, a fire detector, a gas detector, a manual alarm unit, a manual fault message unit, etc. may be used as the detection unit DE1, DE2, DE3.
  • a service unit CC can also be connected to the at least one control unit SE via a third communication network KN3, which can also be, for example, a circuit-switching, a packet-switching or a radio communication network or a bus system.
  • This service unit CC can be located in the building where the elevator installation is located or outside the building.
  • As a communication terminal in the building a mobile station, a service point of the lift manufacturer, a center of the fire department, a communication terminal outside the building, etc. are used.
  • the data is sent to the at least one control unit SE.
  • the control unit SE evaluates the received data or signals based on at least a first rule.
  • a first rule for example, a comparison of a trigger datum or a threshold value or of received data with stored data or threshold values can be used.
  • the type, the possible risk for the user of the elevator or the elevator installation, the effect on the elevator installation, the current utilization of the elevator, the whereabouts of the elevator etc. can be formulated as criteria for the first rule.
  • the at least one first rule can be stored in a memory unit which is connected to the at least one control unit SE.
  • a fault or danger procedure is created.
  • interference or hazard procedure for example, a situation-dependent schedule for evacuation of the user of the elevator, a control of communication between the user with a service unit CC, a measure to calm the user, a measure to bridge the waiting time between the occurrence of sturgeon - or dangerous situation, a preparation of a timetable for the help or rescue measures and initiation of rescue and / or assistance measures (eg communication establishment with a service unit CC, arrival of service personnel, fire brigade, building service, etc.) etc. are used.
  • a schedule may be prepared in the event that, for example, the elevator is out of service.
  • the user of the elevator system can either be asked to report to the reception or be assigned to another elevator or an escalator to reach his destination.
  • a data medium e.g. B. an RFID chip
  • data sent from a mobile station e.g. a personal identification card for entering the destination in the audio-visual communication unit and the input causes a disturbance (the identification is incorrect, expired, not present, the destination is not stored etc.), so in this case, the user can be asked for. B. to report when receiving.
  • the audio-visual communication unit has to receive data concerning the destination of a user on a corresponding operating unit.
  • the current location of the elevator car AK, the time, the state of the exit point, the time of arrival of help or rescue, the state of the elevator system, the number of people in the elevator car AK, the state of the persons or the user etc. used as a criterion.
  • the at least one further rule can be stored in a memory unit which is connected to the at least one control unit SE.
  • At least one at least partially animated visual sequence containing at least one instruction for a user of the elevator installation is transmitted to the audio-visual communication unit KE in dependence on this procedure.
  • the user of the elevator is with the at least one sequence to act such. B. for listening, speaking, leaving the elevator, waiting a certain or indefinite period of time, keep calm, etc. prompted.
  • the at least partially animated sequence can also be bridged, for example the waiting time between the detection of a disturbance or danger situation and the initiation of rescue and / or assistance measures are used.
  • FIG. 2 shows a simplified representation of an inventive audio-visual communication unit KE.
  • the audio-visual communication unit KE has an image output unit BAE, for example a display, a high-resolution color display, a display, a screen etc. and has an audio output unit AAE, for example a loudspeaker etc., which in each case via an interface 1 are connected to a picture and an audio control unit BASE, which are arranged on a single circuit board.
  • the interface 1 is designed such that different image or audio output units can be connected to the image and audio control unit BASE.
  • a receiving unit EE for receiving data or signals, for example the at least one at least partially animated sequence, from at least one control unit SE and a transmitting unit PE for transmitting data or signals to the control unit SE are connected to the image and audio control unit BASE connected.
  • the audio-visual communication unit KE can also be an operating unit BE for operating the elevator or the elevator installation and a microphone, which for reasons of clarity not in FIG. 2 has been presented for inputting speech.
  • This control unit may consist of buttons, switches, buttons, a touch screen or the like, for example.
  • this manual switch can also be replaced by a configuration option by means of a computer program.
  • FIG. 3 shows an example of guiding a user in communication with a service unit.
  • FIG. 3A represents an at least partially animated sequence that is output on the audio-visual communication unit KE.
  • the selection and transfer of the sequence were according to the method FIG. 1 ,
  • the user of the elevator installation can read that the connection is established (intercom on) and that he should speak into the microphone.
  • the control unit SE a Hazard procedure created.
  • the hazard procedure provides for the establishment of a connection with a service unit CC, so that help and rescue measures can be initiated.
  • the user in the elevator car AK is guided by the communication between him and the service unit CC.
  • FIG. 1 represents an at least partially animated sequence that is output on the audio-visual communication unit KE.
  • the selection and transfer of the sequence were according to the method FIG. 1 ,
  • the user of the elevator installation can read that the connection is established (intercom on) and that he should speak into the microphone.
  • the control unit SE a Hazard procedure created.
  • FIG. 3A Sequence shown gives the user in the elevator car AK the instruction to use the audio-visual communication unit KE for communication with the service unit CC and to speak into the microphone. That a connection to the service unit CC is established is in FIG. 3B shown. The user is again prompted to use the audio-visual communication unit KE or speak into the microphone of the audio-visual communication unit KE. Once this is done, the at least one control unit, as in FIG. 3C represented, transmitted to the audio-visual communication unit KE another at least partially animated sequence. Thus, the user is instructed to listen to the instructions, such as in the form of speech sent from the service unit CC to the audio-visual communication unit KE. At the same time, he, the user, is signaled that the connection between the service unit CC and the audio-visual communication unit KE is established.
  • the Figures 3D to 3F show how the user in the elevator car AK is instructed to listen or to speak with the aid of an at least partially animated sequence.
  • the user is guided or guided by the disturbance or danger procedure created by the at least one control unit SE, which means that the psychological stress that can burden the user in the elevator car AK in a disruptive or hazardous situation, either even can not arise, the user is indeed conveyed the feeling that he is constantly cared for and help or rescue measures are already initiated, or at least can be greatly reduced.
  • FIG. 4 shows an example of instructing or guiding a user in the event of an alarm.
  • the image output unit BAE has, as in the FIGS. 4A to 4D shown, a divided into ad areas display or screen.
  • the display in five display areas, namely information with the floors to be approached and the total floors of the building 1, the next stop and direction 2, time 3, weather and location 4 and information about the next stop (on floor 15 is the research department (R & D)) 5, divided. Any information can thus be presented to the user in the elevator car AK.
  • FIG. 4 shows an example of instructing or guiding a user in the event of an alarm.
  • the at least one third rule either the at least one information in a display area or at least one display area is highlighted.
  • a priority in case of a disturbance or dangerous situation the person using the elevator, the proximity to the destination floor, the type of disturbance or hazard situation, the elapsed time duration of the disturbance or dangerous situation, etc. can be used.
  • FIG. 4C the user is prompted to request help by pressing the alarm button with the corresponding symbol.
  • Figure 4D the user is informed in the elevator car AK by the swiveling / oscillating alarm symbol / alarm bell that the alarm has been sent to a responsible unit, ie that assistance and rescue measures have been initiated. In addition, the user is instructed to keep calm.
  • the individual display areas 1 to 5 at least partially animated sequences are displayed.
  • the information that is currently relevant for the user ie the signaling of an alarm case using a symbol such.
  • a yellow bell, a fire, an evacuation symbol, etc. highlighted and the information
  • the actual information in this example, the next stop and the direction of travel into the background or be replaced, as in the display area 5 in the Figures 4C and 4D is shown.
  • the image output unit BAE namely the display area, which is important for example for the current operating state of the elevator installation or for the user.
  • the other display areas could be hidden, blended, minimized, etc. during this time, for example.
  • FIGS. 5A to 5D an example is given for guiding a user in case of fire. If a fire is detected by a detection unit DE1, DE2, DE3, then the detection unit DE1, DE2, DE3 sends the data or signals to the at least one control unit SE of the elevator installation. As in FIG. 1 described, the at least one control unit evaluates the data or signals, creates in this case a hazard procedure for the fire and transmits at least an at least partially animated sequence to the audio-visual communication unit KE, the at least one at least partially animated sequence at least one instruction for the user in the elevator car AK contains.
  • the display of the image output unit BAE in addition to the display areas according to FIGS. 4A to 4D another display area 6, the user, as in the FIGS.
  • 5C and 5D shows, instructs to keep calm and gives the information that the situation is being monitored.
  • These informational hints may also be animated (flashing, fading out, pulsing, etc.).
  • ad area 2 as in the FIGS. 5B to 5D You can see a fire symbol that consists of an at least partially animated sequence.
  • FIG. 6 shows an example of guiding a user in an evacuation in a fire, earthquake or the like. So it can, for example, in the case of fire from the FIGS. 5A to 5D be necessary that the user in the elevator car AK must be evacuated. So that panic and anxiety of the user can be largely avoided, the user is on the one hand on the upcoming evacuation with the help of FIG. 1 informed transmitted at least partially animated sequence and on the other instructed to leave the elevator car AK on reaching the evacuation floor. This can additionally be supported by an audio sequence, such as an alarm signal, etc.
  • the inventive method is achieved that the user A sense of security is given and he can assume that relief and rescue measures have already been taken. Thus, the mental stress is reduced to a minimum.

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  • Indicating And Signalling Devices For Elevators (AREA)
EP09160810A 2009-05-20 2009-05-20 Guidage d'un utilisateur d'ascenseur Withdrawn EP2253570A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09160810A EP2253570A1 (fr) 2009-05-20 2009-05-20 Guidage d'un utilisateur d'ascenseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09160810A EP2253570A1 (fr) 2009-05-20 2009-05-20 Guidage d'un utilisateur d'ascenseur

Publications (1)

Publication Number Publication Date
EP2253570A1 true EP2253570A1 (fr) 2010-11-24

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EP09160810A Withdrawn EP2253570A1 (fr) 2009-05-20 2009-05-20 Guidage d'un utilisateur d'ascenseur

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10011460B2 (en) 2016-09-27 2018-07-03 Otis Elevator Company Elevator dynamic displays for messaging and communication
US10155639B2 (en) 2016-06-08 2018-12-18 Otis Elevator Company Elevator notice system
US10227209B2 (en) 2016-04-06 2019-03-12 Otis Elevator Company Orchestration of an occupant evacuation operation using destination entry fixtures

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1076030A2 (fr) * 1999-08-06 2001-02-14 Jean Paul Bastiaans Belot Système de communication pour ascenseurs avec transmission d'informations enregistrées
US20020036122A1 (en) * 2000-04-03 2002-03-28 Televator Corporation Elevator communication system
DE202005002754U1 (de) 2005-02-20 2006-07-13 Qatsi.Tv Gmbh & Co. Kg Multimedialer Aufzug
WO2006101316A1 (fr) * 2005-03-21 2006-09-28 Saehan Elevator Co., Ltd. Appareil a ecran tactile destine a commander un ascenseur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1076030A2 (fr) * 1999-08-06 2001-02-14 Jean Paul Bastiaans Belot Système de communication pour ascenseurs avec transmission d'informations enregistrées
US20020036122A1 (en) * 2000-04-03 2002-03-28 Televator Corporation Elevator communication system
DE202005002754U1 (de) 2005-02-20 2006-07-13 Qatsi.Tv Gmbh & Co. Kg Multimedialer Aufzug
WO2006101316A1 (fr) * 2005-03-21 2006-09-28 Saehan Elevator Co., Ltd. Appareil a ecran tactile destine a commander un ascenseur

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10227209B2 (en) 2016-04-06 2019-03-12 Otis Elevator Company Orchestration of an occupant evacuation operation using destination entry fixtures
US10155639B2 (en) 2016-06-08 2018-12-18 Otis Elevator Company Elevator notice system
US10011460B2 (en) 2016-09-27 2018-07-03 Otis Elevator Company Elevator dynamic displays for messaging and communication

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