EP0698714A1 - Door safety system - Google Patents

Door safety system Download PDF

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Publication number
EP0698714A1
EP0698714A1 EP95890154A EP95890154A EP0698714A1 EP 0698714 A1 EP0698714 A1 EP 0698714A1 EP 95890154 A EP95890154 A EP 95890154A EP 95890154 A EP95890154 A EP 95890154A EP 0698714 A1 EP0698714 A1 EP 0698714A1
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EP
European Patent Office
Prior art keywords
door
leaves
control device
frame
door frame
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Withdrawn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
EP95890154A
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German (de)
French (fr)
Inventor
Martin Spitzer
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.)
WITRONIC ELEKTRONISCHE GERATE GmbH
Original Assignee
WITRONIC ELEKTRONISCHE GERATE GmbH
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 WITRONIC ELEKTRONISCHE GERATE GmbH filed Critical WITRONIC ELEKTRONISCHE GERATE GmbH
Publication of EP0698714A1 publication Critical patent/EP0698714A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/40—Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42—Detection using safety edges
    • E05F15/46—Detection using safety edges responsive to changes in electrical capacitance
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors

Definitions

  • the invention relates to a security door system, in particular for elevator doors, consisting of a door frame and one or more, in particular power-operated, door leaves.
  • Power operated doors are used in almost all areas of public life, for example in elevators, means of transport and as building entrance doors. They can be designed as sliding doors, swinging doors, folding doors etc. These power-operated doors are equipped with safety devices such as light barriers, ultrasonic sensors, infrared sensors and mechanical closing force limiters with relatively great effort, so that as far as possible all dangers that arise during the closing movement of the door leaves can be recognized and the door closing movement can be interrupted.
  • At least the surfaces of the door frame and door leaves consist of electrically conductive material, that the door leaves are mounted electrically insulated from one another and from the door frame, and that the surfaces of the door frame and door leaves or these themselves are connected to a control unit for touch measurement.
  • sheet steel is used as the base material for the door leaves, but glass or plastic is also used in various cases. Irrespective of this, the surface must be made electrically conductive using appropriate means, e.g. by applying a conductive layer, which may be transparent for design reasons, or an insulating lacquer layer must be avoided.
  • the electrically insulated assembly of the door leaf or door leaves and door frame can be carried out using insulators made of plastic or other electrically insulating materials.
  • the door frame is usually attached directly to a building or vehicle wall and is electrically grounded.
  • the contact measurement is advantageously carried out in the security door system according to the invention in that the control device measures the ohmic or complex electrical resistance between the door leaves or between door leaves and door frame.
  • the complex electrical resistance is preferably measured since it allows a more precise evaluation.
  • the electrical capacity of the door frame and door leaves can also be measured and reacted to a change in capacity caused by touch.
  • control unit When resistance or capacitance changes are detected which exceed a, preferably adjustable, value, the control unit outputs an output signal.
  • the output signal of the control unit advantageously controls a relay for stopping the door.
  • the output signal of the control device is output to a door controller by means of serial or parallel data transmission. It should be provided that the output signal is processed by the control with priority in the door control and, in particular immediately, triggers an emergency stop of the door leaves.
  • the example shown is a sliding door for access to the shaft or elevator car.
  • This sliding door consists of the door frame 2 and two door leaves 1A, 1B which are moved by a motor at different speeds.
  • the gap between the two door leaves 1A, 1B is 5 mm on average.
  • the door frame 2 is attached directly to the car or to a building wall and is usually electrically grounded.
  • the door leaves 1A, 1B are mounted electrically insulated from one another and also from the door frame.
  • the conductive surfaces of door frames and leaves are each connected via a plastic-insulated line to a control unit 3, which can be mounted directly on the door frame 2.
  • a control unit 3 In the control unit 3 there is a measuring device which measures the ohmic or complex electrical resistance between the respective surfaces. When the door parts are insulated, this is in the megohm range and is reduced considerably when touched (to a few to several hundred kiloohms). The measurement of the complex electrical resistance is preferred because the evaluation is more precise for both the ohmic and the capacitive resistance.
  • the electrical capacitance of the individual surfaces can also be measured. This also changes when touched.
  • a corresponding output signal is generated in control unit 3.
  • This signal can be further processed in several ways. It is advantageous to provide a corresponding output relay and to use it to switch off the door motor supply directly.
  • serial or parallel communication of the control 3 with an elevator control is also possible, the signal being processed by the control 3 with priority in the elevator control and this immediately triggers an emergency stop of the door leaves and prevents any further movement of the door leaves in any direction .
  • direct shutdown with a relay is currently preferred.
  • the invention has been described by way of example for an elevator sliding door. However, it is not limited to this, but is suitable for every type of door, such as swinging, folding, sliding, etc., and for any application, such as a building or vehicle door. It is also not necessary for the door leaves to be operated by a motor; rather, the invention can also be used in the case of manually operated doors which have a stop or braking device which can be controlled by the control device.

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  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The system is used with doors contg. electrically conducting door plates (1A,1B) and frame (2), whereby the plates and frame are electrically isolated from each other. The surfaces of the door plates and frame or the actual plates and frame are connected to a control device (3) for contact measurement. The control device measures the Ohmic and complex impedances between the door plates and between the door plates and the door frame. It also measures the capacitances of the door elements. If measured values exceed pref. adjustable values, a door stopping signal is generated.

Description

Die Erfindung betrifft ein Sicherheitstürsystem, insbesondere für Aufzugstüren, bestehend aus einem Türrahmen und einem oder mehreren, insbesondere kraftbetriebenen, Türblättern.The invention relates to a security door system, in particular for elevator doors, consisting of a door frame and one or more, in particular power-operated, door leaves.

Kraftbetriebene Türen werden in so gut wie allen Bereichen des öffentlichen Lebens eingesetzt, beispielsweise bei Aufzügen, Transportmitteln und als Gebäudeeingangstüren. Sie können als Schiebetüren, Schwingtüren, Falttüren etc. ausgeführt sein. Mit relativ großem Aufwand werden diese kraftbetriebenen Türen mit Sicherheitseinrichtungen wie Lichtschranken, Ultraschallsensoren, Infrarotsensoren und mechanischen Schließkraftbegrenzern ausgerüstet, sodaß möglichst alle Gefahren, welche bei der Schließbewegung der Türblätter entstehen, erkannt und die Türschließbewegung unterbrochen werden kann.Power operated doors are used in almost all areas of public life, for example in elevators, means of transport and as building entrance doors. They can be designed as sliding doors, swinging doors, folding doors etc. These power-operated doors are equipped with safety devices such as light barriers, ultrasonic sensors, infrared sensors and mechanical closing force limiters with relatively great effort, so that as far as possible all dangers that arise during the closing movement of the door leaves can be recognized and the door closing movement can be interrupted.

Es gibt jedoch keine Sicherheitseinrichtung, welche die Türblattbewegung in der Öffnungsrichtung überwacht. Die Gefahren, die beim Öffnen einer Tür drohen, sind nicht so augenfällig wie jene beim Schließen. Es besteht aber auch z.B. beim Öffnen einer Schwingtür die Gefahr des Einklemmens zwischen Türblatt und Türrahmen. Es sind aus der Vergangenheit auch mehrere Unfälle bekanntgeworden, wo vor allem kleine Kinder verletzt wurden, weil deren Hand in den konstruktiv notwendigen Spalt zwischen Türblatt oder -blättern und Türrahmen von Schiebetüren gerieten.However, there is no safety device that monitors the door leaf movement in the opening direction. The dangers of opening a door are not as obvious as those of closing it. But there is also e.g. when opening a swing door there is a risk of getting caught between the door leaf and door frame. Several accidents have also become known in the past, in which small children in particular were injured because their hands got into the constructively necessary gap between the door leaf or door leaf and the door frame of sliding doors.

Um solche Unfälle in Zukunft zu verhindern, wird nun erfindungsgemäß vorgeschlagen, daß zumindest die Oberflächen von Türrahmen und Türblättern aus elektrisch leitendem Material bestehen, daß die Türblätter voneinander und vom Türrahmen elektrisch isoliert montiert sind und daß die Oberflächen von Türrahmen und Türblättern bzw. diese selbst mit einem Steuergerät zur Berührungsmessung verbunden sind.In order to prevent such accidents in the future, it is now proposed according to the invention that at least the surfaces of the door frame and door leaves consist of electrically conductive material, that the door leaves are mounted electrically insulated from one another and from the door frame, and that the surfaces of the door frame and door leaves or these themselves are connected to a control unit for touch measurement.

Es wird zwar in den meisten Fällen als Grundmaterial der Türblätter Stahlblech verwendet, verschiedentlich kommt aber auch Glas oder Kunststoff zum Einsatz. Unabhängig davon muß mit entsprechenden Mitteln die Oberfläche elektrisch leitfähig gemacht werden, z.B. durch Auftragen einer leitfähigen, aus Designgründen eventuell transparenten, Schicht bzw. muß von einer isolierenden Lackschicht abgesehen werden. Das gleiche gilt auch für den Türrahmen. Die elektrisch isolierte Montage von Türblatt bzw. Türblättern und Türrahmen kann mittels Isolatoren aus Kunststoff oder anderen elektrisch isolierenden Materialien erfolgen. Der Türrahmen ist normalerweise direkt an einer Gebäude- oder Fahrzeugwand befestigt und elektrisch geerdet.In most cases, sheet steel is used as the base material for the door leaves, but glass or plastic is also used in various cases. Irrespective of this, the surface must be made electrically conductive using appropriate means, e.g. by applying a conductive layer, which may be transparent for design reasons, or an insulating lacquer layer must be avoided. The same applies to the door frame. The electrically insulated assembly of the door leaf or door leaves and door frame can be carried out using insulators made of plastic or other electrically insulating materials. The door frame is usually attached directly to a building or vehicle wall and is electrically grounded.

Die Berührungsmessung erfolgt beim erfindungsgemäßen Sicherheitstürsystem zweckmäßig dadurch, daß das Steuergerät den ohmschen oder komplexen elektrischen Widerstand zwischen den Türblättern bzw. zwischen Türblättern und Türrahmen mißt. Bevorzugt wird der komplexe elektrische Widerstand gemessen, da er eine präzisere Auswertung erlaubt.The contact measurement is advantageously carried out in the security door system according to the invention in that the control device measures the ohmic or complex electrical resistance between the door leaves or between door leaves and door frame. The complex electrical resistance is preferably measured since it allows a more precise evaluation.

Alternativ dazu kann auch die elektrische Kapazität von Türrahmen und Türblättern gemessen und auf eine durch Berührung zustandekommende Kapazitätsänderung reagiert werden.As an alternative to this, the electrical capacity of the door frame and door leaves can also be measured and reacted to a change in capacity caused by touch.

Bei Erkennen von Widerstands- oder Kapazitätsänderungen, die einen, vorzugsweise einstellbaren, Wert übersteigen, wird vom Steuergerät ein Ausgangssignal abgegeben.When resistance or capacitance changes are detected which exceed a, preferably adjustable, value, the control unit outputs an output signal.

Vorteilhaft steuert das Ausgangssignal des Steuergeräts ein Relais zur Türanhaltung an.The output signal of the control unit advantageously controls a relay for stopping the door.

In einer anderen Ausführung der Erfindung wird das Ausgangssignal des Steuergeräts mittels serieller oder paralleler Datenübertragung an eine Türsteuerung ausgegeben. Dabei sollte vorgesehen werden, daß das Ausgangssignal von der Steuerung mit Priorität in der Türsteuerung verarbeitet wird und, insbesondere unmittelbar, einen Nothalt der Türblätter auslöst.In another embodiment of the invention, the output signal of the control device is output to a door controller by means of serial or parallel data transmission. It should be provided that the output signal is processed by the control with priority in the door control and, in particular immediately, triggers an emergency stop of the door leaves.

Unter Bezugnahme auf die Figur wird nun ein Ausführungsbeispiel der Erfindung näher erläutert. Beim dargestellten Beispiel handelt es sich um eine Schiebetür für den Schachtzugang oder Fahrkorb eines Aufzugs. Diese Schiebetür besteht aus dem Türrahmen 2 und zwei motorisch mit unterschiedlicher Geschwindigkeit bewegten Türblättern 1A, 1B. Der Spalt zwischen den beiden Türblättern 1A, 1B beträgt durchschnittlich 5 mm. Bei solchen Schiebetüren besteht beim Öffnungsvorgang vor allem für Kleinkinder die Gefahr, daß die Hand im Spalt zwischen den Türblättern bzw. zwischen Türblatt 1B und Türrahmen 2 eingeklemmt wird. Es sind mehrere solcher Unfälle bekanntgeworden. Für Erwachsene besteht aufgrund der geringen Spaltbreite nach menschlichem Ermessen keine Gefahr. Auch ist die Möglichkeit gering, daß Gegenstände in den Spalt gezogen werden und dadurch Menschen verletzen. Türrahmen und -blätter bestehen aus elektrisch leitendem Material, z.B. Stahlblech, oder wurden durch das Auftragen einer elektrisch leitenden Schicht an ihrer Oberfläche leitfähig gemacht. Der Türrahmen 2 ist direkt am Fahrkorb oder an einer Gebäudewand befestigt und üblicherweise elektrisch geerdet. Die Türblätter 1A, 1B sind voneinander und auch gegenüber dem Türrahmen elektrisch isoliert montiert. Die leitenden Flächen von Türrahmen und -blättern sind jeweils über eine kunststoffisolierte Leitung mit einem Steuergerät 3 verbunden, das direkt auf dem Türrahmen 2 montiert sein kann. Im Steuergerät 3 ist eine Meßeinrichtung vorhanden, die den ohmschen oder komplexen elektrischen Widerstand zwischen den jeweiligen Oberflächen mißt. Dieser liegt bei isolierter Montage der Türteile im Megaohmbereich und verringert sich bei Berührung beträchtlich (auf einige bis mehrere hundert Kiloohm). Die Messung des komplexen elektrischen Widerstands wird bevorzugt, weil die Auswertung sowohl für den ohmschen als auch den kapazitiven Widerstand präziser ist.With reference to the figure, an embodiment of the invention will now be explained in more detail. The example shown is a sliding door for access to the shaft or elevator car. This sliding door consists of the door frame 2 and two door leaves 1A, 1B which are moved by a motor at different speeds. The gap between the two door leaves 1A, 1B is 5 mm on average. With such sliding doors, there is a risk, especially for small children, of opening the hand in the gap between the door leaves or between door leaf 1B and door frame 2. Several such accidents have been reported. Due to the small gap width, there is no risk for adults due to human judgment. There is also little possibility of objects being pulled into the gap and thereby injuring people. Door frames and leaves are made of electrically conductive material, e.g. Steel sheet, or were made conductive by applying an electrically conductive layer on their surface. The door frame 2 is attached directly to the car or to a building wall and is usually electrically grounded. The door leaves 1A, 1B are mounted electrically insulated from one another and also from the door frame. The conductive surfaces of door frames and leaves are each connected via a plastic-insulated line to a control unit 3, which can be mounted directly on the door frame 2. In the control unit 3 there is a measuring device which measures the ohmic or complex electrical resistance between the respective surfaces. When the door parts are insulated, this is in the megohm range and is reduced considerably when touched (to a few to several hundred kiloohms). The measurement of the complex electrical resistance is preferred because the evaluation is more precise for both the ohmic and the capacitive resistance.

Alternativ dazu kann auch eine Messung der elektrischen Kapazität der einzelnen Oberflächen durchgeführt werden. Auch diese ändert sich bei Berührung.Alternatively, the electrical capacitance of the individual surfaces can also be measured. This also changes when touched.

Überschreitet die Meßwertänderung eine einstellbare Grenze, so wird im Steuergerät 3 ein entsprechendes Ausgangssignal generiert. Die Weiterverarbeitung dieses Signals kann auf mehrere Arten erfolgen. Vorteilhaft ist es, ein entsprechendes Ausgangsrelais vorzusehen und mit diesem direkt die Türmotorversorgung abzuschalten. Es ist jedoch auch eine serielle oder parallele Kommunikation der Steuerung 3 mit einer Aufzugssteuerung möglich, wobei zweckmäßig das Signal von der Steuerung 3 mit Priorität in der Aufzugssteuerung bearbeitet wird und diese unmittelbar einen Nothalt der Türblätter auslöst und jede weitere Bewegung der Türblätter in jede Richtung verhindert. Derzeit wird aus Sicherheitsgründen die direkte Abschaltung mit einem Relais vorgezogen.If the change in measured value exceeds an adjustable limit, a corresponding output signal is generated in control unit 3. This signal can be further processed in several ways. It is advantageous to provide a corresponding output relay and to use it to switch off the door motor supply directly. However, serial or parallel communication of the control 3 with an elevator control is also possible, the signal being processed by the control 3 with priority in the elevator control and this immediately triggers an emergency stop of the door leaves and prevents any further movement of the door leaves in any direction . For safety reasons, direct shutdown with a relay is currently preferred.

Die Erfindung wurde beispielhaft für eine Aufzugsschiebetür beschrieben. Sie ist jedoch nicht darauf beschränkt, sondern für jeden Türtyp, wie Schwing-, Falt-, Schiebetür etc. und jeden Einsatzzweck wie Gebäude-, oder Fahrzeugtür geeignet. Es ist auch nicht nötig, daß die Türblätter motorisch betrieben werden; vielmehr kann die Erfindung auch bei handbetätigbaren Türen zum Einsatz kommen, die über eine vom Steuergerät ansteuerbare Stop- bzw. Bremseinrichtung verfügen.The invention has been described by way of example for an elevator sliding door. However, it is not limited to this, but is suitable for every type of door, such as swinging, folding, sliding, etc., and for any application, such as a building or vehicle door. It is also not necessary for the door leaves to be operated by a motor; rather, the invention can also be used in the case of manually operated doors which have a stop or braking device which can be controlled by the control device.

Claims (7)

Sicherheitstürsystem, insbesondere für Aufzugstüren, bestehend aus einem Türrahmen und einem oder mehreren, insbesondere kraftbetriebenen, Türblättern, dadurch gekennzeichnet, daß zumindest die Oberflächen von Türrahmen (2) und Türblättern (1A, 1B) aus elektrisch leitendem Material bestehen, daß die Türblätter (1A, 1B) voneinander und vom Türrahmen (2) elektrisch isoliert montiert sind und daß die Oberflächen von Türrahmen und Türblättern bzw. diese selbst mit einem Steuergerät (3) zur Berührungsmessung verbunden sind.Security door system, in particular for elevator doors, consisting of a door frame and one or more, in particular power-operated, door leaves, characterized in that at least the surfaces of the door frame (2) and door leaves (1A, 1B) consist of electrically conductive material such that the door leaves (1A , 1B) from each other and from the door frame (2) are mounted electrically insulated and that the surfaces of the door frame and door leaves or these themselves are connected to a control device (3) for contact measurement. Sicherheitstürsystem nach Anspruch 1, dadurch gekennzeichnet, daß das Steuergerät (3) den ohmschen oder komplexen elektrischen Widerstand zwischen den Türblättern (1A, 1B) bzw. zwischen Türblättern und Türrahmen (2) mißt.Security door system according to Claim 1, characterized in that the control device (3) measures the ohmic or complex electrical resistance between the door leaves (1A, 1B) or between the door leaves and the door frame (2). Sicherheitstürsystem nach Anspruch 2, dadurch gekennzeichnet, daß das Steuergerät (3) die elektrische Kapazität von Türrahmen (2) und Türblättern (1A, 1B) mißt.Security door system according to claim 2, characterized in that the control device (3) measures the electrical capacity of the door frame (2) and door leaves (1A, 1B). Sicherheitstürsystem nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Steuergerät (3) bei Erkennen von Widerstands- oder Kapazitätsänderungen, die einen, vorzugsweise einstellbaren, Wert übersteigen, ein Ausgangssignal abgibt.Security door system according to claim 2 or 3, characterized in that the control device (3) emits an output signal upon detection of changes in resistance or capacitance which exceed a, preferably adjustable, value. Sicherheitstürsystem nach Anspruch 4, dadurch gekennzeichnet, daß das Ausgangssignal des Steuergeräts (3) ein Relais zur Türanhaltung ansteuert.Security door system according to claim 4, characterized in that the output signal of the control device (3) controls a relay for stopping the door. Sicherheitstürsystem nach Anspruch 4, dadurch gekennzeichnet, daß das Ausgangssignal des Steuergeräts (3) mittels serieller oder paralleler Datenübertragung an eine Türsteuerung ausgegeben wird.Security door system according to claim 4, characterized in that the output signal of the control device (3) is output to a door control by means of serial or parallel data transmission. Sicherheitstürsystem nach Anspruch 6, dadurch gekennzeichnet, daß das Ausgangssignal von der Steuerung (3) mit Priorität in der Türsteuerung verarbeitet wird und, insbesondere unmittelbar, einen Nothalt der Türblätter (1A, 1B) auslöst.Security door system according to claim 6, characterized in that the output signal from the controller (3) is processed with priority in the door controller and, in particular immediately, triggers an emergency stop of the door leaves (1A, 1B).
EP95890154A 1994-08-26 1995-08-28 Door safety system Withdrawn EP0698714A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT164894 1994-08-26
AT1648/94 1994-08-26

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EP0698714A1 true EP0698714A1 (en) 1996-02-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096226A1 (en) * 2000-06-13 2001-12-20 Cedes Ag Safety device for elevator doors
EP1286478A1 (en) * 2001-08-10 2003-02-26 Mayser GmbH & Co. Tactile Sensor System with Transponder
WO2003069104A1 (en) * 2002-02-15 2003-08-21 Wittur S.P.A. Pinching-prevention device for automatic doors, in particular for lifts and/or elevators
EP1770046A1 (en) * 2005-10-03 2007-04-04 SEMATIC ITALIA S.p.A. Safety device for lift doors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1548379A (en) * 1966-08-05 1968-12-06
US4240528A (en) * 1977-05-04 1980-12-23 Maschinenfabrik Augsburg-Nuernberg Aktiengesellschaft Field sensor
DE4036465A1 (en) * 1989-11-15 1991-05-16 Setec Messgeraete Gmbh Proximity control for servo operated vehicle winding - has three electrode structure with reference levels of proximity capacitances
DE4231816A1 (en) * 1992-09-23 1994-03-24 Dorma Gmbh & Co Kg Diagnostic and monitoring system for automatic door system - has distributed monitoring units providing status data fed back to central unit that can be used to change operational parameters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1548379A (en) * 1966-08-05 1968-12-06
US4240528A (en) * 1977-05-04 1980-12-23 Maschinenfabrik Augsburg-Nuernberg Aktiengesellschaft Field sensor
DE4036465A1 (en) * 1989-11-15 1991-05-16 Setec Messgeraete Gmbh Proximity control for servo operated vehicle winding - has three electrode structure with reference levels of proximity capacitances
DE4231816A1 (en) * 1992-09-23 1994-03-24 Dorma Gmbh & Co Kg Diagnostic and monitoring system for automatic door system - has distributed monitoring units providing status data fed back to central unit that can be used to change operational parameters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096226A1 (en) * 2000-06-13 2001-12-20 Cedes Ag Safety device for elevator doors
US7044271B2 (en) 2000-06-13 2006-05-16 Cedes Ag Safety device for pinching zone of elevator doors
EP1286478A1 (en) * 2001-08-10 2003-02-26 Mayser GmbH & Co. Tactile Sensor System with Transponder
WO2003069104A1 (en) * 2002-02-15 2003-08-21 Wittur S.P.A. Pinching-prevention device for automatic doors, in particular for lifts and/or elevators
EP1770046A1 (en) * 2005-10-03 2007-04-04 SEMATIC ITALIA S.p.A. Safety device for lift doors

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