EP1882666B1 - Procédé de contrôle d'accès à un ascenseur - Google Patents

Procédé de contrôle d'accès à un ascenseur Download PDF

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Publication number
EP1882666B1
EP1882666B1 EP20070112519 EP07112519A EP1882666B1 EP 1882666 B1 EP1882666 B1 EP 1882666B1 EP 20070112519 EP20070112519 EP 20070112519 EP 07112519 A EP07112519 A EP 07112519A EP 1882666 B1 EP1882666 B1 EP 1882666B1
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EP
European Patent Office
Prior art keywords
car
landing
elevator
receiving means
identification pattern
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EP20070112519
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German (de)
English (en)
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EP1882666A1 (fr
Inventor
Wolfgang Vogl
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Inventio AG
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Inventio AG
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Priority to EP20070112519 priority Critical patent/EP1882666B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0043—Devices enhancing safety during maintenance
    • B66B5/005—Safety of maintenance personnel

Definitions

  • the present invention relates to a method of controlling access to an elevator car in particular for maintenance and/or inspection.
  • the maintenance mechanic thereto calls the car to his floor and stops the car by opening the elevator shaft door with a triangular key when the ceiling of the car is on a level which is accessible from said floor.
  • he may stop the car by opening the elevator shaft door when the bottom of the car is on a level which makes it possible to visually inspect the components arranged in the region of the car bottom or to get access to the underside of the car.
  • the maintenance mechanic 6 may call the elevator car by operating the landing call button on level E4. The moment at which car 5, arriving in response to the call, is halfway between level E3 and subsequent level E4, the mechanic opens the landing door T4 manually with a triangular key.
  • An opened door automatically stops the traveling car so that mechanic 6 gets access to the car ceiling 7 from door T4. Having finished maintenance, mechanic 6 leaves the car ceiling and the elevator shaft 1 and closes the door T4, so that the elevator may resume its normal routine.
  • the mechanic 6 may call the elevator car to the lowest level E1. By opening door T1 of level E1, he stops the car on a level between E2 and E1 in order to be able to enter into the shaft pit and to get access to the car underside from the bottom of the shaft pit. Having finished maintenance, mechanic 6 leaves the shaft pit 2 and closes the door T1, so that the elevator may resume its normal routine.
  • this conventional method although quite simple - has some disadvantages. If there is a group of parallel elevators, the maintenance mechanic cannot selectively call the car to be maintained but the elevator group control will send one car out of the group in response to his call according to a predetermined routine (e.g. based on registered calls, distances between cars and calling floor etc.). Thus, the mechanic cannot select a specific car in order to perform maintenance work on a specific elevator of the elevator group.
  • a predetermined routine e.g. based on registered calls, distances between cars and calling floor etc.
  • JP 02 225278 A suggests a cipher signal output means providing cipher signals causing a control to move the elevator car to a stop position of a car so that its ceiling level coincides with a selected boarding hall level. After opening the landing door, a mechanic then has access to the car ceiling.
  • this method requires registration of the cipher signal by the control and thus specific means for inputting and for receiving this signal. Moreover, the cipher signal also must indicate the car to be maintained as well as the floor the mechanic wants to get acces from. This method implies additional hardware requirements as well as complex signals in order to overcome the problems described above. Therefore this method is complex and expensive.
  • a method of controlling access to an elevator car comprises the steps of
  • the elevator control is switched into said maintenance mode by at least operating a landing call receiving means in a predetermined identification pattern which is different from the normal pattern to call the elevator.
  • operating a landing call receiving means in the predetermined identification pattern is a necessary condition to switch into maintenance mode.
  • Operating a landing call receiving means in the predetermined identification pattern alone may already be sufficient to switched into maintenance mode.
  • switching into maintenance mode may require to fulfill additional conditions like opening a landing door.
  • the landing call receiving means to switch into maintenance mode by operating it in a predetermined identification pattern, there is no need for additional extra means for sending and receiving the required signals. Instead, hardware may be used which is anyway included in conventional elevators. Only the related control functions are to be adapted. Additionally, the floor from which the maintenance mechanic wants to get access to the car is automatically recognized by identifying the corresponding landing call receiving means.
  • the landing call receiving means may comprise a call button, a card reader and/or a voice call means.
  • the predetermined identification pattern may be characterized by a predetermined sequence of pressing the button.
  • this sequence may be defined as a certain number of presses within a predetermined time period, e.g. three presses within three seconds or the like.
  • this sequence may be defined like a Morse signal, e.g. by two short presses followed by one long presses and another four short presses (providing "INS" in morse code as an abbreviation of the word "INSPECTION”).
  • the sequence may comprise pressing an "up” and "down” button in a predetermined pattern.
  • an identification pattern can be distinguished from a normal call pattern like one press or repeated presses in a random sequence, e.g. from presses entered, for example, by different passengers or one impatient passenger.
  • the landing call receiving means comprises a card reader
  • a special maintenance card comprising a predetermined identification pattern, or a predetermined identification pattern may be defined by inserting a normal card different times in a predetermined sequence and/or direction (e.g. inserting the card twice in a first direction, followed by inserting it once in an opposite direction).
  • the landing call receiving means comprises a voice call means
  • the maintenance mechanic may speak a code word or the like as the predetermined identification pattern.
  • the landing door must be unlocked or opened for a short time to switch into said maintenance mode.
  • it requires hardware equipment to open the landing door and cryptic knowledge of the identification pattern to call a car to a stop position permitting access.
  • one out of a group of elevator cars can be selected in a simple manner.
  • the car also may be selected by operating the landing call receiving means in different car-specific predetermined identification patterns, i.e. different predetermined patterns identifying different cars.
  • the landing door must be unlocked or opened within a predetermined time period before or after operating the landing call receiving means to switch into said maintenance mode.
  • the pattern will be recognized as identification pattern. If, on the contrary, the landing call receiving means is operated in the predetermined pattern by chance, this will not be accepted as an identification pattern since the landing door is not unlocked or opened at the same occasion.
  • the elevator control is switched into said maintenance mode by, firstly, unlocking or opening the landing door and, subsequently, operating the landing call receiving means in the predetermined identification pattern.
  • the elevator control is switched into a blocked status inhibiting travel of the corresponding car by said unlocking or opening of a landing door. If, and only if, subsequently the landing call receiving means is operated in the predetermined identification pattern, the elevator control then is switched from blocked status into maintenance mode for the car corresponding to the unlocked or opened landing door, allowing to move the car to a predetermined stop position.
  • the elevator control is switched into said maintenance mode vice versa by, firstly, operating the landing call receiving means in the predetermined identification pattern, and, subsequently, opening or unlocking the landing door.
  • the elevator control is switched into a pre-maintenance mode by operating the landing call receiving means in the predetermined identification pattern and will not switch into a blocked status when a landing door is unlocked or opened afterwards, but will then switch into maintenance mode.
  • the elevator control is not switched into pre-maintenance mode, it will switch into blocked status when a landing door is opened, thus also preventing misuse in form of lift surfing as well as other dangerous situations caused by unintended opening of a landing door.
  • the landing door may be opened manually by actuating an emergency unlocking system, preferably by means of a triangular key.
  • Conventional triangular keys may be used for an emergency unlocking system while at the same time misuse is prevented since a predetermined identification code is additionally necessary to switch into maintenance mode, i.e. to allow access to the ceiling or the underside of a car. If only a landing door is opened without operating the landing call receiving means in the predetermined identification pattern, the elevator control may automatically switch into a blocked status, preventing travel of the car.
  • the maintenance stop position may be determined by the floor of the operated landing call receiving means, i.e. by the level at which said means is situated.
  • access to the car underside only is possible from a shaft pit at the bottom of the elevator shaft, i.e. when the car is in a position where its underside is placed a certain distance above the lowest floor level, allowing access of the maintenance mechanic from the lowest landing door to the shaft pit.
  • access to the car ceiling is possible only from levels beyond the lowest level since the car cannot descend so that its ceiling coincides with the lowest level.
  • operating a landing call receiving means positioned at the lowest level will indicate maintenance of the car underside, and the elevator control will control the car into a position allowing access to its underside from within the shaft pit.
  • operating a landing call receiving means positioned at another landing level will indicate maintenance of or from the car ceiling, and the elevator control will move the car into a position allowing access to its ceiling from the floor level of the landing call receiving means (e.g. car ceiling level approximately coinciding with the landing floor level).
  • the predetermined identification pattern itself may indicate a maintenance stop position, in particular a stop position allowing access to or at least sight of the ceiling or the underside of the car, with respect to the floor of the landing call receiving means.
  • a first predetermined identification pattern indicates a stop position allowing access to the ceiling while a second predetermined identification pattern, different from the first, indicates a stop position allowing access to or sight of the underside of the car, from the floor of the landing call receiving means.
  • pressing a call button three times within five seconds may switch the elevator control in a ceiling maintenance mode in which the car is controlled to travel into a stop position in which its ceiling substantially coincides with the landing floor level of the floor in which the operated landing call receiving means is located. Having opened the corresponding landing door before or after operating the call button accordingly, the maintenance mechanic then easily has access the ceiling of the selected car.
  • pressing the call button twice within five seconds may switch the elevator control in a underside maintenance mode in which the car is controlled to travel into a stop position above the landing floor level of the floor in which the operated landing call receiving means is located. Having unlocked or opened the corresponding landing door before or after operating the call button accordingly, the maintenance mechanic then easily has access to or at least sight of the underside of the selected car from the landing floor.
  • the landing call receiving means may comprise an "up" call button indicating that the calling persons wants to travel upwards and a "down" call button to call the elevator to travel downwards.
  • an "up” call button indicating that the calling persons wants to travel upwards
  • a "down” call button to call the elevator to travel downwards.
  • operating the "up” call button in a predetermined sequence like for example three short presses followed by three long presses can be identified as the first predetermined identification pattern indicating a stop position allowing access to the ceiling.
  • Operating the "down” call button in the same predetermined sequence of three short and three long presses can be identified as the second predetermined identification pattern indicating a stop position allowing access to or sight of the underside of the car.
  • the control moves the car to the predetermined stop position when the car is empty and/or there are no pending car calls.
  • the elevator control first may determine whether the car is empty (e.g. by analyzing a weighing signal from the car or after all calls of the car have been satisfied). Additionally or alternatively, the elevator control may determine whether there are pending calls for that car. This may be answered in the affirmative either if there are no pending calls at all or if the calls pending can be answered by other cars of the elevator. Then, only if the car is empty and/or there are no pending calls to be answered by that car, the elevator control moves the car to the predetermined stop position, allowing access to or at least sight of its ceiling or underside.
  • elevator control only is switched back into normal mode after the landing door has been closed and the landing call receiving means has been operated a in a predetermined closing identification pattern which may be identical to or different from the predetermined identification pattern to switch into maintenance code.
  • a predetermined closing identification pattern which may be identical to or different from the predetermined identification pattern to switch into maintenance code.
  • the mechanic only must remember one pattern which facilitates daily operation.
  • the second predetermined identification pattern differs from the predetermined identification pattern to switch into maintenance code, this further decreases the possibility of an unauthorized person getting access to the car ceiling (which requires knowledge of the predetermined identification pattern to switch into maintenance code) and remaining there after having closed the landing door (since it requires knowledge of the predetermined closing identification pattern to switch back into normal mode).
  • a call button is pressed by a passenger
  • the elevator control determines on the basis of a stored algorithm, which of the plurality of cars is to answer that call. For example, the car next to the floor assigned to said call button 10 may be determined. Alternatively, an unoccupied car may be sent to answer this call.
  • the respective call button 10 advantageously comprises two separate buttons, one "up” button 10.1 and one "down” button 10.2. As it is known in the art, pressing the "up” button will be registered as calling a car to go up and vice versa. Then, the elevator control will determine a car going up already only to answer "up” button calls while "down” button calls only will be answered by cars already descending.
  • a maintenance mechanic 6 positioned at one of the landing floor levels (level E4 is depicted in the Fig. 1 as an example), first opens or unlocks the corresponding landing door T4 by a triangular key, activating its emergency unlocking system. This switches the elevator control of the elevator car 5, which has been selected by opening a landing door of the corresponding elevator shaft, into a blocked status, in which travel of the selected car 5 is prevented.
  • mechanic 6 presses the "up” button 10.1 and/or the "down” button 10.2 on this landing floor, in a predetermined sequence.
  • Said sequence is chosen such that it is unlikely to be applied by normal passengers by chance. Since a passenger may repeatedly press a call button if being impatient, or different passengers may press the same button, said sequence may comprise long and short presses of the "up” button 10.1 and/or the “down” button 10.2 in a predetermined sequence and within a predetermined time period. For example, such sequence may comprise two short presses, followed by one long press, all within three seconds.
  • the mechanic 6 operates the landing call receiving means in a first predetermined identification pattern.
  • the recognition of said first predetermined identification pattern switches the control of the selected elevator car 5 from blocked status into maintenance mode.
  • the elevator control determines the floor level E4 at which the maintenance mechanic 6 inputted the call and causes the selected car 5 to travel to a predetermined stop position W4, associated with said determined floor level. Since the mechanic operated the landing call receiving means in the first predetermined identification pattern by pressing the "up" button 10.1, the control moves the car to a stop position W4, shown in Fig. 1 , in which the ceiling 7 of the car 5 is easily accessible from the determined floor E4 through the corresponding landing door T4.
  • the elevator control may move the car to the stop position W4 in which its ceiling 7 of the car 5 is accessible, irrespective of whether the "up" button 10.1 or the "down” button 10.2 has been pressed.
  • This is the preferred solution for elevator installations requiring maintenance access only to the car ceiling in all the maintenance levels beyond the lowest level.
  • the determined level is the upmost level
  • also machinery located in the upper part 3 of the elevator shaft 1, in particular the drive unit 4 and/or ropes may be inspected and/or maintained.
  • a mechanic 6 wants to maintain components arranged in the region of the underside of car 5 and/or in the lower part 2 of the elevator shaft 1, he may open or unlock landing door T1 of the lowest floor, thereby switching the control of the elevator car 5 into its blocked status.
  • the mechanic 6 operates the landing call receiving means in a second predetermined identification pattern, thereby switching the control of elevator car 5 from blocked status into maintenance mode.
  • the elevator control determines the floor level E1 at which the maintenance mechanic 6 inputted the call and causes the selected car 5 to travel to a predetermined stop position W1 associated with the determined floor level E1. Since the mechanic operated the landing call receiving means in the second predetermined identification pattern by pressing the "down" button 10.2 in the predetermined sequence, the control moves the car to a stop position W1, shown in Fig. 2 , in which the maintenance mechanic 6 has access to or at least sight on the underside of the car 5 from the determined floor E1 through the corresponding landing door T1.
  • the elevator control may move the car to the stop position W1 such that its underside is accessible, irrespective of whether the "up” button or the "down” button has been pressed in the predetermined sequence.
  • the stop position W1 is such that the underside of the elevator car is positioned at a certain distance above the lowest floor level E1, allowing the maintenance mechanic to enter from the lowest floor through the open shaft door T1 into the elevator shaft pit 2.
  • the maintenance mechanic is able to inspect and maintain said components arranged in the region of the elevator car 5 as well as a number of components placed in the lowest part of the elevator shaft 1.
  • the first and second predetermined identification pattern may not be defined as pressing the "up” button and the "down” button respectively in the same sequence of presses, but may be distinguished by pressing one call button in different sequences. For example, instead of pressing the "up" button by two short presses, followed by one long press, all within three seconds, the first predetermined identification pattern may be determined by pressing one call button five times within three seconds. Then the second predetermined identification pattern may be determined by pressing the same call button three times within three seconds.
  • the elevator control provides an information signal indicating to the maintenance mechanic that the elevator control is switched into maintenance mode, in which the elevator control controls the car to travel to a predetermined stop position.
  • hall lanterns provided on the landing levels, in normal elevator operation pre-anouncing and indicating travel of the elevator car, are used for indicating the maintenance mode status. For instance, blinking hall lanterns inform the maintenance mechanic that the control has switched to said maintenance mode and that the car is on its way to the requested maintenance position. When the car has reached the requested maintenance position, the hall lanterns are switched from blinking to continuous illumination as long as the car is resting in said maintenance position and in maintenance mode.
  • the described information may also be provided by other types of indicators, for instance by a buzzer or any indicating lamp available on the landing levels.
  • safety means 8, 9 may be operated by the elevator control in maintenance mode. I.e. when the elevator control is switched into maintenance mode by receiving the first predetermined identification signal or receiving a predetermined identification signal from a landing call receiving means not corresponding to the lowest level, indicating a request for access to the car ceiling 7, a safety means 8 may be activated, preventing the elevator car 5 from traveling above a highest stop position W4 shown in Fig. 1 . Thereby, a dangerous reduction of the room 3 above the ceiling of the elevator car is prevented.
  • a safety means 9 may be activated preventing the elevator car 5 from traveling below a lowest stop position W1 shown in Fig. 2 , thereby preventing a dangerous reduction of the room 2 below the underside of the car.

Landscapes

  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Claims (13)

  1. Procédé de commande de l'accès à une cabine d'ascenseur (5), en particulier à son plafond (7) et/ou à son dessous, comprenant les étapes consistant à :
    - ouvrir une porte palière (T1, T2, T3, T4) de la gaine d'ascenseur (1) dans laquelle se déplace la cabine (5) ; et à
    - mettre la commande de l'ascenseur dans un mode de maintenance qui commande le déplacement de la cabine (5) jusqu'à une position d'arrêt prédéterminée (W1, W4) permettant l'accés ;
    caractérisé en ce que
    la commande de l'ascenseur est mise dans ledit mode de maintenance en utilisant un moyen de réception d'appel de palier dans une forme d'identification prédéterminée qui diffère d'une forme d'appel pour appeler l'ascenseur dans un fonctionnement normal de l'ascenseur.
  2. Procédé selon la revendication 1, dans lequel la porte palière doit en outre être ouverte ou déverrouillée pour mettre la commande dans ledit mode de maintenance.
  3. Procédé selon la revendication 2, dans lequel la porte palière doit être ouverte ou déverrouillée dans les limites d'une période de temps prédéterminée avant ou après l'utilisation du moyen de réception d'appel de palier pour mettre la commande dans ledit mode de maintenance.
  4. Procédé selon la revendication 2 ou 3, dans lequel la commande de l'ascenseur est mise dans ledit mode de maintenance
    - premièrement, en ouvrant la porte palière ; et
    - ensuite, en utilisant le moyen de réception d'appel de palier dans la forme d'identification prédéterminée.
  5. Procédé selon la revendication 2 ou 3, dans lequel la commande de l'ascenseur est mise dans ledit mode de maintenance
    - premièrement, en utilisant le moyen de réception d'appel de palier dans la forme d'identification prédéterminée ; et
    - ensuite, en ouvrant la porte palière.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel la porte palière est ouverte manuellement en actionnant un système de déverrouillage d'urgence, en particulier au moyen d'une clé triangulaire.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel la forme d'identification prédéterminée et/ou l'étage (E1, E2, E3, E4) du moyen de réception d'appel de palier indiquent une position d'arrêt (W1, W4), en particulier une position d'arrêt permettant l'accès au plafond et/ou au dessous de la cabine d'ascenseur, par rapport à l'étage (E1, E2, E3, E4) du moyen de réception d'appel d'étage.
  8. Procédé selon la revendication 7, dans lequel une première forme d'identification prédéterminée et/ou une forme d'identification prédéterminée provenant d'un moyen de réception d'appel de palier d'un étage au-delà de l'étage le plus bas indiquent une position d'arrêt (W1) permettant l'accès au plafond; et une deuxième forme d'identification prédéterminée reçue d'un moyen de réception d'appel de palier de l'étage le plus bas indique une position d'arrêt (W1) permettant l'accès au dessous de la cabine d'ascenseur (5), depuis l'étage (E1, E4) du moyen de réception d'appel de palier.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel le moyen de réception d'appel de palier comprend un bouton d'appel (10), et/ou un lecteur de carte et/ou un moyen d'appel vocal.
  10. Procédé selon la revendication 9, dans lequel le moyen de réception d'appel de palier comprend au moins deux boutons d'appel (bouton "montée" (10.1), bouton "descente" (10.2)) et dans lequel la forme d'identification prédéterminée comprend la sélection d'un des au moins deux boutons d'appel (10.1, 10.2).
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel la commande de l'ascenseur déplace la cabine d'ascenseur (5) jusqu'à la position d'arrêt prédéterminée lorsque la cabine (5) est vide et/ou qu'il n'y a pas d'appel de cabine en attente.
  12. Procédé selon l'une quelconque des revendications précédentes, dans lequel la commande est remise du mode de maintenance dans un mode normal en fermant la porte palière et en utilisant le moyen de réception d'appel de palier dans une forme d'identification de fermeture prédéterminée.
  13. Procédé selon la revendication 12, dans lequel la forme d'identification de fermeture est identique à la forme d'identification prédéterminée pour la mise de la commande dans le mode de maintenance ou diffère de celle-ci.
EP20070112519 2006-07-26 2007-07-16 Procédé de contrôle d'accès à un ascenseur Active EP1882666B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070112519 EP1882666B1 (fr) 2006-07-26 2007-07-16 Procédé de contrôle d'accès à un ascenseur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06117891 2006-07-26
EP20070112519 EP1882666B1 (fr) 2006-07-26 2007-07-16 Procédé de contrôle d'accès à un ascenseur

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EP1882666A1 EP1882666A1 (fr) 2008-01-30
EP1882666B1 true EP1882666B1 (fr) 2013-10-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11008196B2 (en) 2017-07-12 2021-05-18 Otis Elevator Company Blocking device

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076531A1 (fr) 2009-12-21 2011-06-30 Inventio Ag Dispositif de validation de l'accès à la cage d'une installation d'ascenseur
FI125118B (fi) * 2013-01-07 2015-06-15 Kone Corp Hissi
RU2017107260A (ru) 2014-08-22 2018-09-24 Отис Элевэйтор Компани Система запирания двери лифтовой шахты и способ управления доступом в лифтовую шахту
WO2016178050A1 (fr) 2015-05-07 2016-11-10 Otis Elevator Company Commande d'accès de cage d'ascenseur de système d'ascenseur
WO2017212106A1 (fr) * 2016-06-07 2017-12-14 Kone Corporation Procédé et système d'ouverture du verrou d'une porte palière d'un ascenseur
US11072515B2 (en) 2018-03-27 2021-07-27 Otis Elevator Company Automated elevator maintenance mode initiation
US20210316961A1 (en) * 2018-09-25 2021-10-14 Inventio Ag Method and elevator control arrangement for controlling a maintenance mode of an elevator system
EP3760561B1 (fr) 2019-07-05 2022-05-11 Otis Elevator Company Ensemble ascenseur ayant une butée de blocage de contrepoids
EP3798172B1 (fr) * 2019-09-26 2021-12-08 Otis Elevator Company Commande de mouvement d'une cabine d'ascenseur d'un système d'ascenseur

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Publication number Priority date Publication date Assignee Title
JPH02225278A (ja) * 1989-02-28 1990-09-07 Toshiba Corp エレベータの制御装置
JP2006502932A (ja) * 2002-10-15 2006-01-26 オーチス　エレベータ　カンパニー ピコネットモジュールを用いたエレベータワイヤレス通信基盤
EP1466853A1 (fr) * 2003-04-07 2004-10-13 Inventio Ag Méthode pour l' entretien d'un ascenseur
JP2007516138A (ja) * 2003-09-15 2007-06-21 オーチス　エレベータ　カンパニー エレベータ点検用安全装置
WO2005095249A1 (fr) * 2004-03-31 2005-10-13 Otis Elevator Company Systeme de controle d'ascenseur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11008196B2 (en) 2017-07-12 2021-05-18 Otis Elevator Company Blocking device

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