EP3486209B1 - Industrial truck with transparent display within driver protection roof - Google Patents

Industrial truck with transparent display within driver protection roof Download PDF

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Publication number
EP3486209B1
EP3486209B1 EP18202771.4A EP18202771A EP3486209B1 EP 3486209 B1 EP3486209 B1 EP 3486209B1 EP 18202771 A EP18202771 A EP 18202771A EP 3486209 B1 EP3486209 B1 EP 3486209B1
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EP
European Patent Office
Prior art keywords
display
industrial truck
load
driver
transparent
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Application number
EP18202771.4A
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German (de)
French (fr)
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EP3486209C0 (en
EP3486209A1 (en
Inventor
Michael Voss
Ronald Ziel
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STILL GmbH
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STILL GmbH
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Publication of EP3486209C0 publication Critical patent/EP3486209C0/en
Publication of EP3486209B1 publication Critical patent/EP3486209B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/0755—Position control; Position detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07545—Overhead guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/24—Electrical devices or systems

Definitions

  • the invention relates to an industrial truck, in particular a forklift or reach truck, with a driver's workplace and a driver's protective roof, which includes a throw-resistant, transparent roof pane to protect the driver.
  • the industrial trucks include counterbalance forklifts and reach trucks, which have a driver's workstation and a load part arranged directly in front of the driver's workstation.
  • the load part usually comprises a lifting mast with a vertically movable load-carrying device, in particular a load fork.
  • These industrial trucks are used in particular in warehouses with high shelf heights. This creates the risk that the load or parts of the load will fall during handling, for example when setting it down or picking it up from an upper shelf.
  • a driver's protective roof In order to protect the driver at the driver's workplace in such a case, it is known to provide a driver's protective roof.
  • This driver's protective roof can be formed from a strut roof, in which the driver is protected by metal bars or grilles above the driver's workplace.
  • the disadvantage of this prior art is that the driver has a limited view of the upper working area of the industrial truck, i.e. the working area of the load-carrying device when it is moved on the lifting mast at the upper end of the lifting area.
  • a display device for example a display
  • a display device for example a display
  • the dashboard and the drive part are designed to be relatively low.
  • Such displays which are arranged in the area of a dashboard or on the top of a drive part, are placed in such a way that the driver has the display in his direct field of vision when the load handler is lowered and while the industrial truck is moving.
  • an operator located in the driver's workplace looks straight ahead in the direction of the load or upwards while handling the load and in particular when picking up or placing a load, especially at higher lifting heights.
  • the operator has a display device arranged on the dashboard or on the top of the drive part in the As a rule, it is no longer in the direct field of vision, so that the information can no longer be read by the operator when stacking and unloading the load.
  • the driver of the industrial truck therefore has to turn his head and change the direction of vision in order to be able to see the information on the display while handling the load at high lifting heights. Due to the required rotation of the head and change of viewing direction, the hydraulic functions of the truck cannot function during this time operated, which reduces the handling capacity of the industrial truck. There is also unfavorable ergonomics when handling loads at high lifting heights.
  • Such display devices are usually not transparent and therefore impair or narrow the operator's field of vision on the load part and the load to be handled. Therefore, these display devices are usually designed to be compact and small. However, this results in only a limited amount of information being able to be displayed. As a rule, only one piece of information can be displayed, for example the lifting height or the load weight. In addition, the compact dimensions of these display devices lead to poor readability of the information displayed.
  • a reach truck is known, in the front window of which a display is arranged, which is glued on in the form of laminated layers.
  • the present invention is based on the object of designing an industrial truck of the type mentioned in such a way that information for allows the driver to look up through the roof window without affecting the driver's field of vision.
  • the invention enables the driver to keep an eye on the load even when handling loads at higher lifting heights and at the same time to be informed of driver-relevant information that is shown on the transparent display on the roof window.
  • the display device By designing the display device as a transparent display, the driver's field of vision is not restricted.
  • the invention offers the driver the possibility of looking directly upwards through the roof window and at the same time reading the transparent display.
  • the transparent display is conveniently glued to the roof pane.
  • the display can also be laminated onto the roof pane from above or below.
  • the transparent display is arranged between two panes when the roof pane is designed in multiple layers.
  • a projector is provided for this purpose and is aimed at the roof pane.
  • the roof pane itself is preferably made of glass, particularly laminated glass.
  • Such laminated glass panes are also known as bulletproof glass in particularly impact-resistant or puncture-resistant versions. They consist of several layers of glass panes with plastic films arranged between them.
  • the roof panel is made of a transparent plastic material, which is also impact-resistant.
  • the display is designed as a transparent electroluminescent display (LED).
  • Transparent electroluminescent displays have a structure in which a light-emitting layer, usually a phosphor layer, is arranged between a front and a rear electrode, the front and rear electrodes being made of a transparent and see-through material in order to achieve the transparency and translucency of the entire display.
  • a light-emitting layer usually a phosphor layer
  • the front and rear electrodes being made of a transparent and see-through material in order to achieve the transparency and translucency of the entire display.
  • Such transparent electroluminescent displays are highly robust, have a long service life and are highly resistant to environmental influences, for example oil, fats, acids and chemicals, and can be used at temperatures from -50° to +85° C, so that such displays are suitable for use in industrial trucks even under harsh environmental conditions and in cold stores.
  • transparent electroluminescent displays are water-resistant and waterproof, so that these displays can be used in warehouses and when the industrial truck is in operation. can be used outdoors.
  • transparent electroluminescent displays have a high image brightness, a high contrast and a high viewing or reading angle of up to 180°, so that the information displayed can be optimally read when the industrial truck is in operation.
  • the readability of the information displayed for the operator can be further improved by a single-color or multi-color representation of the information displayed on a transparent electroluminescent display by choosing a suitable color, for example yellow, orange or red.
  • the display is designed as a transparent thin-film electroluminescence display (TFT).
  • TFT transparent thin-film electroluminescence display
  • Such a transparent thin-film electroluminescent display which has a flat and film-like structure, can be formed in any shape, for example curved or curved, and thus also in complex shapes, whereby such a display can be easily installed at a corresponding and suitable location in the The driver's field of vision is attached to the roof window and can be easily adapted to the conditions of the industrial truck.
  • the design of the transparent electroluminescent display using thin film technology further enables improved optical properties in the form of reduced light scattering, which can further improve the readability of the information displayed.
  • the display is designed as a transparent organic electroluminescence display (OLED).
  • OLED organic electroluminescence display
  • Such displays have organic light-emitting diodes, i.e. luminous thin-film components made of organic semiconducting materials.
  • OLED displays One advantage of OLED displays is the very high contrast, since they do not require a background lighting.
  • the load weight determined using a weighing device can be displayed in the transparent display and, in the event of an overload, this can be displayed.
  • the lifting device of the load-carrying device is actuated, the lifting height and/or the tilt angle of the load-carrying device can be displayed in the transparent display.
  • limiting vehicle reactions for example a maximum permissible driving speed or a maximum permissible lifting height, can be displayed based on the load weight, the type of load or the set lifting height.
  • the goods information for the load can be shown in the transparent display.
  • the truck When the truck is driving, it makes sense to display the current travel speed or, if a load is being picked up, a maximum permissible travel speed.
  • restrictive vehicle reactions for example a necessary reduction in driving speed, can be displayed.
  • a direction indicator can be displayed in the transparent display or, if a change in direction is required, a corresponding turn signal can be displayed in order to guide the operator to a target position in the warehouse.
  • an order can be displayed in the transparent display by a higher-level warehouse management system that carries out order control in a warehouse.
  • symbols of an assistance system can be displayed, for example a lifting height assistance system and/or a tilt angle assistance system Load handling device that guides and/or supports the driver when handling a load.
  • the display extends essentially over the entire width of the roof pane.
  • the large area of the display allows several pieces of information to be shown simultaneously and in an easy-to-read manner.
  • the display is preferably located on the roof window in the driver's field of vision on the load section side, covering the highest adjustment range of the load handling device. This allows the driver to monitor the display information even when the load handling device is at its maximum lifting height, without having to take his eyes off the load.
  • the invention offers a whole range of advantages:
  • the driver has all the information relevant to load handling in his direct field of vision, even at high lifting heights and therefore looking straight up through the roof window, and therefore does not have to change his direction of vision. This leads to improved ergonomics. Since all information relevant to load handling is in the direct field of vision during load handling, hydraulic functions, for example, can be operated continuously. Assistance systems, in particular for load handling, which support and/or guide the driver in load handling, can also provide the best possible assistance information and provide the driver with the best possible assistance. If the transparent display is not controlled, it is completely transparent. This means that only as much viewing area is used as is needed to display the relevant information. Overall, the driver's line of sight does not have to be changed when reading the display information during load handling at high lifting heights, the driver's view is not obstructed and handling performance is increased. Installation space can also be saved because the display is integrated into the roof pane.
  • the industrial truck is a reach truck.
  • the reach truck has a driver's workplace 1 for a driver 7.
  • the driver's workplace 1 is closed off at the top by a driver's protective roof 3, which has a transparent roof pane 4.
  • the driver's protection roof 3 is supported by driver's protection roof pillars 2.
  • the roof pane 4 consists of impact-resistant laminated glass.
  • the roof pane 4 is provided with a display device designed as a transparent display 5 for displaying information for the driver 7.
  • the transparent display 5 is arranged at the top or bottom of the roof pane 5, for example glued on.
  • the transparent display 5 can be integrated into the roof pane 4, for example between two panes of a roof pane 4 consisting of several panes.
  • Information is displayed on the transparent display 5 in fluorescent orange, yellow or red.
  • the display 5 consists, for example, of an OLED film which is arranged between two stacked glass panes of the roof pane 4.
  • the transparent display 5 is positioned in the field of vision 6 of the driver 7, who is looking up at a raised load-carrying device (not shown in detail).
  • the driver 7 has the opportunity to look directly up through the roof window 4 at a load that has been lifted to a maximum lifting height by means of a lifting mast, not shown, with a liftable load-carrying device, and at the same time to read the transparent display 5.
  • the driver 7 thus has all the information relevant to load handling, for example lifting height, load weight, symbols of an assistance system, which are displayed on the transparent display 5, even at large lifting heights and thus steeply upwards through the roof window 4 directed gaze in his direct field of vision and therefore does not have to change his direction of vision.
  • FIG 2 the reach truck is made of Figure 1 shown in perspective. The same features are designated with the same reference numbers.
  • This view shows the driver 7 looking upwards through the roof window 4.
  • the transparent display 5 is located in the field of vision 6 of the driver 7 looking upwards at a raised load-carrying device (not shown in detail).

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Description

Die Erfindung betrifft ein Flurförderzeug, insbesondere einen Gabelstapler oder Schubmaststapler, mit einem Fahrerarbeitsplatz und einem Fahrerschutzdach, welches eine durchwurfhemmende, durchsichtige Dachscheibe zum Schutz des Fahrers umfasst.The invention relates to an industrial truck, in particular a forklift or reach truck, with a driver's workplace and a driver's protective roof, which includes a throw-resistant, transparent roof pane to protect the driver.

Zu den Flurförderzeugen gehören Gegengewichtsgabelstapler und Schubmaststapler, die einen Fahrerarbeitsplatz sowie einen unmittelbar vor dem Fahrerarbeitsplatz angeordneten Lastteil aufweisen. Der Lastteil umfasst üblicherweise einen Hubmast mit einem höhenbeweglichen Lastaufnahmemittel, insbesondere einer Lastgabel. Diese Flurförderzeuge werden insbesondere auch in Regallagern mit hohen Regalhöhen eingesetzt. Dabei entsteht die Gefahr, dass die Last oder Teile der Last beim Handhaben, etwa beim Absetzen oder Aufnehmen aus einem oberen Regalfach, herabfallen. Um den Fahrer auf dem Fahrerarbeitsplatz in einem solchen Fall zu schützen, ist es bekannt, ein Fahrerschutzdach vorzusehen. Dieses Fahrerschutzdach kann aus einem Strebendach gebildet sein, bei dem durch Metallstäbe oder Gitter über dem Fahrerarbeitsplatz der Fahrer geschützt wird.The industrial trucks include counterbalance forklifts and reach trucks, which have a driver's workstation and a load part arranged directly in front of the driver's workstation. The load part usually comprises a lifting mast with a vertically movable load-carrying device, in particular a load fork. These industrial trucks are used in particular in warehouses with high shelf heights. This creates the risk that the load or parts of the load will fall during handling, for example when setting it down or picking it up from an upper shelf. In order to protect the driver at the driver's workplace in such a case, it is known to provide a driver's protective roof. This driver's protective roof can be formed from a strut roof, in which the driver is protected by metal bars or grilles above the driver's workplace.

Nachteilig an diesem Stand der Technik ist jedoch eine eingeschränkte Sicht des Fahrers auf den oberen Arbeitsbereich des Flurförderzeugs, d.h. den Arbeitsbereich des Lastaufnahmemittels, wenn dieses an dem Hubmast am oberen Ende des Hubbereichs bewegt wird.However, the disadvantage of this prior art is that the driver has a limited view of the upper working area of the industrial truck, i.e. the working area of the load-carrying device when it is moved on the lifting mast at the upper end of the lifting area.

Um bei Flurförderzeugen mit einem derartigen Strebendach zum Schutz des Fahrers dem Fahren beim Blick nach oben die sich durch das Strebendach ergebenden Sichtbeeinträchtigungen zu vermeiden, ist es bereits aus der JP 2005-298179 A und der JP 2005-298176 A bekannt, an der Unterseite des Strebendaches transparente Anzeigevorrichtungen anzubringen, an denen Kamerabilder von Kameras angezeigt werden, die am Strebendach mit einer Orientierung nach oben angebracht sind. Durch die Kameras und die transparente Anzeigevorrichtungen wird somit eine ungehinderte Sicht des Fahrers noch oben simuliert.In order to avoid the visual impairment caused by the strut roof when driving industrial trucks with such a strut roof to protect the driver when looking upwards, it is already JP 2005-298179 A and the JP 2005-298176 A It is known to attach transparent display devices to the underside of the strut roof, which display camera images from cameras that are attached to the strut roof facing upwards. The cameras and the transparent display devices thus simulate an unobstructed view of the driver from above.

Es ist daher bekannt, die Sicht des Fahrers durch das Fahrerschutzdach mithilfe transparenter Materialien zu verbessern, wie etwa Kunststoffscheiben oder Verbundglasscheiben als Dachscheiben, die durchwurf- bzw. durchschlaghemmend ausgeführt sind. Solche Verbundglasscheiben sind in Ausführungen, die sogar beschusshemmend sind, auch als Panzerglas bekannt und bestehen aus mehreren Glasscheiben in Verbindung mit zwischen diesen angeordneten und mit diesen verbundenen Kunststofffolien. Ein derartiges gattungsgemäßes Flurförderzeug mit einem Fahrerarbeitsplatz und einem Fahrerschutzdach, das eine durchwurfhemmende und durchsichtige Dachsscheibe zum Schutz des Fahrers umfasst, ist aus der EP 3 153 457 A1 bekannt.It is therefore known to improve the driver's view through the driver's overhead guard using transparent materials, such as plastic panes or laminated glass panes as roof panes, which are designed to be bullet-proof or impact-resistant. Such laminated glass panes are also known as bullet-proof glass in versions that are even bullet-resistant and consist of several panes of glass in combination with plastic films arranged between them and connected to them. Such a generic industrial truck with a driver's workplace and a driver's overhead guard, which includes a transparent roof pane that is impact-resistant and transparent to protect the driver, is known from EP 3 153 457 A1 known.

Bei Flurförderzeugen ist es auch bekannt, eine Anzeigeeinrichtung, beispielsweise ein Display, im Bereich eines Armaturenbretts oder an der Oberseite eines Antriebsteils, beispielsweise an oder in einer oberen Haube des Antriebsteils, innerhalb des Fahrerarbeitsplatzes anzuordnen. Um die Sicht auf den Lastteil im Betrieb des Flurförderzeugs möglichst wenig einzuschränken, sind das Armaturenbrett bzw. das Antriebsteil relativ niedrig ausgebildet. Derartige im Bereich eines Armaturenbretts oder an der Oberseite eines Antriebsteils angeordnete Displays sind derart platziert, dass der Fahrer das Display bei abgesenktem Lastaufnahmemittel und während der Fahrt des Flurförderzeugs im direkten Sichtfeld hat.In industrial trucks, it is also known to arrange a display device, for example a display, in the area of a dashboard or on the top of a drive part, for example on or in an upper hood of the drive part, within the driver's workplace. In order to restrict the view of the load part as little as possible during operation of the industrial truck, the dashboard and the drive part are designed to be relatively low. Such displays, which are arranged in the area of a dashboard or on the top of a drive part, are placed in such a way that the driver has the display in his direct field of vision when the load handler is lowered and while the industrial truck is moving.

Im Betrieb richtet eine sich im Fahrerarbeitsplatz befindliche Bedienperson während der Lasthandhabung und insbesondere bei der Aufnahme oder dem Absetzen einer Last, insbesondere bei höheren Hubhöhen, den Blick in Richtung des Lastteils geradeaus in Richtung der Last bzw. nach oben. Bei der Lasthandhabung und insbesondere bei der Aufnahme oder dem Absetzen einer Last, insbesondere bei höheren Hubhöhen, wobei die Bedienperson nach oben auf die Last blickt, besteht somit das Problem, dass die Bedienperson eine am Armaturenbrett oder auf der Oberseite des Antriebsteils angeordnete Anzeigeeinrichtung in der Regel nicht mehr im direkten Sichtfeld hat, so dass die Informationen nicht mehr beim Ein- und Ausstapeln der Last von der Bedienperson abgelesen werden können. Der Fahrer des Flurförderzeugs muss somit den Kopf drehen und die Blickrichtung wechseln, um die Informationen an dem Display während der Lasthandhabung bei hohen Hubhöhen sehen zu können. Durch die erforderliche Drehung des Kopfes und Änderung der Blickrichtung können Hydraulikfunktionen des Flurförderzeugs währenddessen nicht bedient werden, wodurch sich die Umschlagsleistung des Flurförderzeugs reduziert. Es ergibt sich weiterhin eine ungünstige Ergonomie bei der Lasthandhabung bei hohen Hubhöhen.During operation, an operator located in the driver's workplace looks straight ahead in the direction of the load or upwards while handling the load and in particular when picking up or placing a load, especially at higher lifting heights. When handling loads and in particular when picking up or placing a load, especially at higher lifting heights, with the operator looking upwards at the load, there is the problem that the operator has a display device arranged on the dashboard or on the top of the drive part in the As a rule, it is no longer in the direct field of vision, so that the information can no longer be read by the operator when stacking and unloading the load. The driver of the industrial truck therefore has to turn his head and change the direction of vision in order to be able to see the information on the display while handling the load at high lifting heights. Due to the required rotation of the head and change of viewing direction, the hydraulic functions of the truck cannot function during this time operated, which reduces the handling capacity of the industrial truck. There is also unfavorable ergonomics when handling loads at high lifting heights.

Aus der EP 1 388 518 B1 ist bereits bekannt, bei einem als Kommissionierflurförderzeug ausgebildeten Flurförderzeug eine Anzeigeeinrichtung in Form eines Displays als Anbauteil an einem Schutzgitter, das sich zwischen dem Lastteil und dem Fahrerarbeitsplatz befindet, anzuordnen. Dadurch befindet sich die Anzeigeeinrichtung in dem lastteilseitigen Sichtfeld der Bedienperson und kann somit im Betrieb des Flurförderzeugs von der Bedienperson bei der Lasthandhabung abgelesen werden, ohne den Blick nach unten richten zu müssen.From the EP 1 388 518 B1 It is already known to arrange a display device in the form of a screen as an attachment to a protective grille located between the load section and the driver's workplace on an industrial truck designed as an order-picking truck. This means that the display device is in the operator's field of vision on the load section side and can therefore be read by the operator when handling the load during operation of the industrial truck without having to look downwards.

Solche Anzeigeeinrichtungen sind üblicherweise nicht durchsichtig und beeinträchtigen bzw. engen daher das lastteilseitige Sichtfeld der Bedienperson auf den Lastteil und die handzuhabende Last ein. Daher werden diese Anzeigeeinrichtungen in der Regel kompakt und klein ausgeführt. Dies führt jedoch dazu, dass nur wenige Informationen angezeigt werden können. In der Regel kann nur eine Information, beispielsweise die Hubhöhe oder das Lastgewicht, angezeigt werden. Zudem führen die kompakten Abmessungen bei diesen Anzeigeeinrichtungen zu einer schlechten Ablesbarkeit der angezeigten Informationen.Such display devices are usually not transparent and therefore impair or narrow the operator's field of vision on the load part and the load to be handled. Therefore, these display devices are usually designed to be compact and small. However, this results in only a limited amount of information being able to be displayed. As a rule, only one piece of information can be displayed, for example the lifting height or the load weight. In addition, the compact dimensions of these display devices lead to poor readability of the information displayed.

Aus der JP 2004-189469 A ist ein Schubmaststapler bekannt, in dessen Frontscheibe ein Display angeordnet ist, das in Form von laminierten Schichten aufgeklebt ist.From the JP 2004-189469 A A reach truck is known, in the front window of which a display is arranged, which is glued on in the form of laminated layers.

In der EP 2 412 661 B1 ist ein Flurförderzeug mit einem Fahrerarbeitsplatz und einem Lastteil beschrieben, bei dem im lastteilseitigen Sichtfeld einer nach vorne blickenden Bedienperson eine als transparentes Display ausgebildete Anzeigeeinrichtung angeordnet ist.In the EP 2 412 661 B1 an industrial truck with a driver's workplace and a load part is described, in which a display device designed as a transparent display is arranged in the load part-side field of vision of an operator looking forward.

Aus der EP 2 518 009 B1 ist ein ähnliches Flurförderzeug bekannt, bei dem das transparente Display im vorderen Bereich eines Fahrerschutzdaches angeordnet ist oder in eine transparente Frontscheibe des Flurförderzeugs integriert ist.From the EP 2 518 009 B1 A similar industrial truck is known in which the transparent display is arranged in the front area of a driver's protective roof or is integrated into a transparent front window of the industrial truck.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Flurförderzeug der eingangs genannten Art so auszugestalten, dass eine Anzeige von Informationen für den Fahrer bei Sicht durch die Dachscheibe nach oben ohne Auswirkungen auf das Sichtfeld des Fahrers ermöglicht wird.The present invention is based on the object of designing an industrial truck of the type mentioned in such a way that information for allows the driver to look up through the roof window without affecting the driver's field of vision.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Dachscheibe mit einer als transparentes Display ausgebildeten Anzeigeeinrichtung zur Anzeige von Informationen für den Fahrer versehen ist, wobei das Display mit einer elektronischen Steuereinrichtung des Flurförderzeugs in Verbindung steht und zur Anzeige von Fahrzeug- und/oder Last- und/oder Assistenz- und/oder Navigationsinformationen ausgebildet ist, wozu eine oder mehrere der folgenden Informationen zählen:

  • Lastgewicht einer aufgenommenen Last
  • Überlastanzeige
  • Fahrzeuginformationen, insbesondere momentane Hubhöhe und/oder momentane Fahrgeschwindigkeit und/oder momentaner Neigewinkel des Lastaufnahmemittels
  • beschränkende Fahrzeugreaktionen
  • Richtungs- oder Abbiegeanzeige eines Lagernavigationssystems
  • Auftragsinformationen eines Lagerverwaltungssystems
  • Wareninformationen einer transportierten Ladung
  • Internetbrowser
  • Symbole eines Assistenzsystems, insbesondere eines Hubhöhenassistenzsystems und/oder eines Neigewinkelassistenzsystems des Lastaufnahmemittels.
This object is achieved according to the invention in that the roof window is provided with a display device designed as a transparent display for displaying information for the driver, wherein the display is connected to an electronic control device of the industrial truck and is designed to display vehicle and/or load and/or assistance and/or navigation information, which includes one or more of the following information:
  • Load weight of a picked up load
  • Overload indicator
  • Vehicle information, in particular current lifting height and/or current driving speed and/or current tilt angle of the load handling device
  • limiting vehicle reactions
  • Direction or turn indication of a warehouse navigation system
  • Order information from a warehouse management system
  • Goods information of a transported load
  • Web browser
  • Symbols of an assistance system, in particular a lifting height assistance system and/or a tilt angle assistance system of the load handling device.

Mit der Erfindung wird es dem Fahrer ermöglicht, auch bei der Lasthandhabung in größeren Hubhöhen die Last im Blick zu behalten und gleichzeitig über fahrerrelevante Informationen informiert zu werden, die an dem transparenten Display der Dachscheibe angezeigt werden. Durch die Ausbildung der Anzeigeeinrichtung als transparentes Display wird dabei der Sichtbereich des Fahrers nicht eingeschränkt. Im Gegensatz zum Stand der Technik nach der EP 2 518 009 B1 , bei dem ein Display im vorderen Bereich eines herkömmlichen Fahrerschutzdaches ohne durchsichtige Dachscheibe angeordnet ist, bietet die Erfindung dem Fahrer die Möglichkeit, direkt nach oben durch die Dachscheibe zu blicken und gleichzeitig das transparente Display abzulesen.The invention enables the driver to keep an eye on the load even when handling loads at higher lifting heights and at the same time to be informed of driver-relevant information that is shown on the transparent display on the roof window. By designing the display device as a transparent display, the driver's field of vision is not restricted. In contrast to the state of the art according to the EP 2 518 009 B1 , in which a display is arranged in the front area of a conventional driver's roof without a transparent roof window, the invention offers the driver the possibility of looking directly upwards through the roof window and at the same time reading the transparent display.

Zweckmäßigerweise ist das transparente Display auf die Dachscheibe geklebt.The transparent display is conveniently glued to the roof pane.

Das Display kann aber auch von oben oder von unten auf die Dachscheibe auflaminiert sein.The display can also be laminated onto the roof pane from above or below.

In einer besonders bevorzugten Ausgestaltung der Erfindung ist bei mehrschichtiger Ausbildung der Dachscheibe das transparente Display zwischen zwei Scheiben angeordnet.In a particularly preferred embodiment of the invention, the transparent display is arranged between two panes when the roof pane is designed in multiple layers.

Es ist auch denkbar ein virtuelles Display vorzusehen, bei dem die Informationen auf die Dachscheibe projiziert werden. Hierfür ist ein Projektor vorgesehen, der auf die Dachscheibe gerichtet ist.It is also conceivable to provide a virtual display in which the information is projected onto the roof pane. A projector is provided for this purpose and is aimed at the roof pane.

Die Dachscheibe selbst besteht vorteilhafterweise aus Glas, insbesondere Verbundglas. Solche Verbundglasscheiben werden in besonders durchwurf- bzw. durchschlaghemmenden Ausführungen auch als Panzerglas bezeichnet. Sie bestehen aus mehreren Schichten von Glasscheiben, zwischen denen Kunststofffolien angeordnet sind.The roof pane itself is preferably made of glass, particularly laminated glass. Such laminated glass panes are also known as bulletproof glass in particularly impact-resistant or puncture-resistant versions. They consist of several layers of glass panes with plastic films arranged between them.

In einer anderen Variante besteht die Dachscheibe aus einem transparenten Kunststoffmaterial, das ebenfalls durchwurf- bzw. durchschlaghemmend ist.In another variant, the roof panel is made of a transparent plastic material, which is also impact-resistant.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist das Display als transparentes Elektrolumineszenz-Display (LED) ausgebildet. Transparente Elektrolumineszenz-Displays weisen einen Aufbau auf, bei dem eine Licht emmitierende Schicht, in der Regel eine Phosphorschicht, zwischen einer vorderen und einer hinteren Elektrode angeordnet ist, wobei die vordere und die hintere Elektrode aus einem transparenten und durchsichtigen Material bestehen, um die Transparenz und Durchsichtigkeit des gesamten Displays zu erzielen. Derartige transparente Elektrolumineszenz-Displays weisen eine hohe Robustheit, eine hohe Lebensdauer und eine hohe Beständigkeit gegen Umwelteinflüsse, beispielsweise Öl, Fette, Säuren und Chemikalien auf, und sind bei Temperaturen von -50° bis +85° C einsetzbar, so dass sich derartige Displays für den Einsatz in Flurförderzeugen auch unter rauen Umgebungsbedingungen und innerhalb von Kühlhäusern eignen. Zudem sind transparente Elektrolumineszenz-Displays wasserbeständig und wasserfest, so dass diese Displays innerhalb von Lagerhallen und beim Betrieb des Flurförderzeugs im Freien eingesetzt werden können. Darüber hinaus weisen transparente Elektrolumineszenz-Displays eine hohe Bildhelligkeit, einen hohen Kontrast und einen hohen Betrachtungs- bzw. Ablesewinkel von bis zu 180° auf, so dass sich im Betrieb des Flurförderzeugs eine optimale Ablesbarkeit der angezeigten Informationen erzielen lässt. Zudem kann durch eine einfarbige oder mehrfarbige Darstellung der angezeigten Information bei einem transparenten Elektrolumineszenz-Display durch eine geeignete Farbwahl, beispielsweise Gelb, Orange oder Rot, die Ablesbarkeit der angezeigten Informationen für die Bedienperson weiter verbessert werden.According to a preferred embodiment of the invention, the display is designed as a transparent electroluminescent display (LED). Transparent electroluminescent displays have a structure in which a light-emitting layer, usually a phosphor layer, is arranged between a front and a rear electrode, the front and rear electrodes being made of a transparent and see-through material in order to achieve the transparency and translucency of the entire display. Such transparent electroluminescent displays are highly robust, have a long service life and are highly resistant to environmental influences, for example oil, fats, acids and chemicals, and can be used at temperatures from -50° to +85° C, so that such displays are suitable for use in industrial trucks even under harsh environmental conditions and in cold stores. In addition, transparent electroluminescent displays are water-resistant and waterproof, so that these displays can be used in warehouses and when the industrial truck is in operation. can be used outdoors. In addition, transparent electroluminescent displays have a high image brightness, a high contrast and a high viewing or reading angle of up to 180°, so that the information displayed can be optimally read when the industrial truck is in operation. In addition, the readability of the information displayed for the operator can be further improved by a single-color or multi-color representation of the information displayed on a transparent electroluminescent display by choosing a suitable color, for example yellow, orange or red.

Besondere Vorteile ergeben sich, wenn das Display als transparentes Dünnfilm-Elektrolumineszenz-Display (TFT) ausgebildet ist. Ein derartiges transparentes Dünnfilm-Elektrolumineszenz-Display, das eine flache und folienartige Struktur aufweist, kann in beliebiger, beispielsweise gekurvter oder gebogener, Form und somit auch in komplexen Formen ausgebildet werden, wodurch ein derartiges Display in einfacher Weise an einer entsprechenden und geeigneten Stelle im Blickfeld des Fahrers an der Dachscheibe angebracht und auf einfache Weise an die Gegebenheiten des Flurförderzeugs angepasst werden kann. Die Ausbildung des transparenten Elektrolumineszenz-Displays in Dünnfilmtechnik ermöglicht weiterhin verbesserte optische Eigenschaften in Form einer verringerten Lichtstreuung, wodurch die Ablesbarkeit der angezeigten Informationen weiter verbessert werden kann.There are particular advantages if the display is designed as a transparent thin-film electroluminescence display (TFT). Such a transparent thin-film electroluminescent display, which has a flat and film-like structure, can be formed in any shape, for example curved or curved, and thus also in complex shapes, whereby such a display can be easily installed at a corresponding and suitable location in the The driver's field of vision is attached to the roof window and can be easily adapted to the conditions of the industrial truck. The design of the transparent electroluminescent display using thin film technology further enables improved optical properties in the form of reduced light scattering, which can further improve the readability of the information displayed.

In einer besonders bevorzugten Ausgestaltung ist das Display als transparentes organisches Elektrolumineszenz-Display (OLED) ausgebildet. Solche Displays weisen organische Leuchtdioden, d.h. leuchtende Dünnschichtbauelemente aus organischen halbleitenden Materialien, auf. Ein Vorteil von OLED-Displays ist der sehr hohe Kontrast, da sie ohne Hintergrundbeleuchtung auskommen.In a particularly preferred embodiment, the display is designed as a transparent organic electroluminescence display (OLED). Such displays have organic light-emitting diodes, i.e. luminous thin-film components made of organic semiconducting materials. One advantage of OLED displays is the very high contrast, since they do not require a background lighting.

Erfindungsgemäß steht das Display mit einer elektronischen Steuereinrichtung des Flurförderzeugs in Verbindung und ist zur Anzeige von Fahrzeug- und/oder Lastinformationen und/oder Assistenz- und/oder Navigationsinformationen ausgebildet. Hierzu zählen eine oder mehrere der folgenden Informationen:

  • Lastgewicht einer aufgenommenen Last
  • Überlastanzeige
  • Fahrzeuginformationen, beispielsweise momentane Hubhöhe und/oder momentane Fahrgeschwindigkeit und/oder momentaner Neigewinkel des Lastaufnahmemittels
  • beschränkende Fahrzeugreaktionen
  • Richtungs- oder Abbiegeanzeige eines Lagernavigationssystems
  • Auftragsinformationen eines Lagerverwaltungssystems
  • Wareninformationen einer transportierten Ladung
  • Internetbrowser
  • Symbole eines Assistenzsystems, beispielsweise eines Hubhöhenassistenzsystems und/oder eines Neigewinkelassistenzsystems des Lastaufnahmemittels.
According to the invention, the display is connected to an electronic control device of the industrial truck and is designed to display vehicle and/or load information and/or assistance and/or navigation information. This includes one or more of the following information:
  • Load weight of a picked up load
  • Overload indicator
  • Vehicle information, such as current lifting height and/or current driving speed and/or current tilt angle of the load handling device
  • limiting vehicle reactions
  • Direction or turn indication of a warehouse navigation system
  • Order information from a warehouse management system
  • Goods information of a transported load
  • Web browser
  • Symbols of an assistance system, for example a lifting height assistance system and/or a tilt angle assistance system of the load handling device.

Beim Aufnahmen einer Last durch das Lastaufnahmemittel kann beispielsweise das mittels einer Wiegeeinrichtung bestimmte Lastgewicht in dem transparenten Display angezeigt werden und im Falle einer Überlast diese angezeigt werden. Zudem kann bei der Betätigung der Hubeinrichtung des Lastaufnahmemittels die Hubhöhe und/oder der Neigewinkel des Lastaufnahmemittels in dem transparenten Display angezeigt werden. Bei der Aufnahme einer Last können durch das Lastgewicht, die Art der Last oder aus der eingestellten Hubhöhe beschränkende Fahrzeugreaktionen, beispielsweise eine maximal zulässige Fahrgeschwindigkeit oder eine maximal zulässige Hubhöhe angezeigt werden. Weiterhin kann nach dem Erkennen einer neu aufgenommen Last die Wareninformation der Ladung in dem transparenten Display dargestellt werden. Im Fahrbetrieb des Flurförderzeugs ist es sinnvoll, die momentane Fahrgeschwindigkeit bzw. bei einer aufgenommenen Last eine maximal zulässige Fahrgeschwindigkeit anzuzeigen. Zudem können beim Einfahren in bestimmte Lagerbereiche eines Lagers beschränkende Fahrzeugreaktionen, beispielsweise eine erforderliche Reduzierung der Fahrgeschwindigkeit, angezeigt werden. Zudem kann bei Vorhandensein eines Lagernavigationssystems in dem transparenten Display eine Richtungsanzeige oder bei einer erforderlichen Richtungsänderung ein entsprechendes Abbiegesignal dargestellt werden, um die Bedienperson an eine Zielposition im Lager zu führen. Weiterhin kann von einem übergeordneten Lagerverwaltungssystem, das in einem Lager eine Auftragssteuerung durchführt, ein Auftrag in dem transparenten Display dargestellt werden. Weiterhin können Symbole eines Assistenzsystems angezeigt werden, beispielsweise eines Hubhöhenassistenzsystems und/oder eines Neigewinkelassistenzsystems des Lastaufnahmemittels, das den Fahrer bei der Lasthandhabung einer Last führt und/oder unterstützt.When a load is picked up by the load-carrying device, for example, the load weight determined using a weighing device can be displayed in the transparent display and, in the event of an overload, this can be displayed. In addition, when the lifting device of the load-carrying device is actuated, the lifting height and/or the tilt angle of the load-carrying device can be displayed in the transparent display. When picking up a load, limiting vehicle reactions, for example a maximum permissible driving speed or a maximum permissible lifting height, can be displayed based on the load weight, the type of load or the set lifting height. Furthermore, after detecting a newly picked up load, the goods information for the load can be shown in the transparent display. When the truck is driving, it makes sense to display the current travel speed or, if a load is being picked up, a maximum permissible travel speed. In addition, when entering certain storage areas of a warehouse, restrictive vehicle reactions, for example a necessary reduction in driving speed, can be displayed. In addition, if a warehouse navigation system is present, a direction indicator can be displayed in the transparent display or, if a change in direction is required, a corresponding turn signal can be displayed in order to guide the operator to a target position in the warehouse. Furthermore, an order can be displayed in the transparent display by a higher-level warehouse management system that carries out order control in a warehouse. Furthermore, symbols of an assistance system can be displayed, for example a lifting height assistance system and/or a tilt angle assistance system Load handling device that guides and/or supports the driver when handling a load.

Vorzugsweise erstreckt sich das Display im Wesentlichen über die gesamte Breite der Dachscheibe. Die großflächige Ausbreitung des Displays ermöglicht es, mehrere Informationen gleichzeitig und leicht lesbar anzuzeigen.Preferably, the display extends essentially over the entire width of the roof pane. The large area of the display allows several pieces of information to be shown simultaneously and in an easy-to-read manner.

Bei Ausbildung des Flurförderzeugs mit einem höhenverstellbaren Lastaufnahmemittel ist das Display bevorzugt im lastteilseitigen, den höchsten Verstellbereich des Lastaufnahmemittels abdeckenden Sichtbereich des Fahrers an der Dachscheibe angeordnet. Auf diese Weise ist dem Fahrer auch bei maximaler Hubhöhe des Lastaufnahmemittels eine Überwachung der Display-Informationen möglich, ohne den Blick von der Last nehmen zu müssen.If the industrial truck is equipped with a height-adjustable load handling device, the display is preferably located on the roof window in the driver's field of vision on the load section side, covering the highest adjustment range of the load handling device. This allows the driver to monitor the display information even when the load handling device is at its maximum lifting height, without having to take his eyes off the load.

Die Erfindung bietet eine ganze Reihe von Vorteilen:
Der Fahrer hat alle für die Lasthandhabung relevanten Informationen auch bei großen Hubhöhen und damit steil nach oben durch die Dachscheibe gerichtetem Blick in seinem direkten Sichtfeld und muss somit seine Blickrichtung nicht wechseln. Dies führt zu einer verbesserten Ergonomie. Da alle für die Lasthandhabung relevanten Informationen während der Lasthandhabung im direkten Sichtfeld liegen, können z.B. Hydraulikfunktionen durchgehend bedient werden. Auch Assistenzsysteme, insbesondere zur Lasthandhabung, die den Fahrer bei der Lasthandhabung unterstützen und/oder führen, können bestmöglich Assistenzinformationen liefern und den Fahrer bestmöglich assistieren. Wird das transparente Display nicht angesteuert, ist es vollständig transparent. Somit wird nur soviel Sichtfläche genommen wie für die Anzeige der entsprechenden Information benötigt wird. Insgesamt muss die Blickrichtung des Fahrers beim Ablesen der Display-Informationen während der Lasthandhabung bei hohen Hubhöhen nicht geändert werden, die Sicht des Fahrers wird nicht behindert und die Umschlagsleistung wird erhöht. Außerdem kann Bauraum gespart werden, weil das Display in die Dachscheibe integriert ist.The invention offers a whole range of advantages:
The driver has all the information relevant to load handling in his direct field of vision, even at high lifting heights and therefore looking straight up through the roof window, and therefore does not have to change his direction of vision. This leads to improved ergonomics. Since all information relevant to load handling is in the direct field of vision during load handling, hydraulic functions, for example, can be operated continuously. Assistance systems, in particular for load handling, which support and/or guide the driver in load handling, can also provide the best possible assistance information and provide the driver with the best possible assistance. If the transparent display is not controlled, it is completely transparent. This means that only as much viewing area is used as is needed to display the relevant information. Overall, the driver's line of sight does not have to be changed when reading the display information during load handling at high lifting heights, the driver's view is not obstructed and handling performance is increased. Installation space can also be saved because the display is integrated into the roof pane.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in den schematischen Figuren dargestellten Ausführungsbeispiels näher erläutert. Hierbei zeigt

Figur 1
den Fahrerarbeitsplatz eines erfindungsgemäßen Schubmaststaplers in der Seitenansicht und
Figur 2
den Fahrerarbeitsplatz des Schubmaststaplers der Figur 1 in einer perspektivischen Ansicht
Further advantages and details of the invention are explained in more detail using the exemplary embodiment shown in the schematic figures. This shows
Figure 1
the driver's workplace of a reach truck according to the invention in a side view and
Figure 2
the driver's workplace of the reach truck Figure 1 in a perspective view

Im Beispiel von Figur 1 handelt es sich beim Flurförderzeug um einen Schubmaststapler. Der Schubmaststapler weist einen Fahrerarbeitsplatz 1 für einen Fahrer 7 auf. Der Fahrerarbeitsplatz 1 wird nach oben hin von einem Fahrerschutzdach 3 abgeschlossen, welches eine durchsichtige Dachscheibe 4 aufweist. Das Fahrerschutzdach 3 ist von Fahrerschutzdachsäulen 2 getragen.In the example of Figure 1 The industrial truck is a reach truck. The reach truck has a driver's workplace 1 for a driver 7. The driver's workplace 1 is closed off at the top by a driver's protective roof 3, which has a transparent roof pane 4. The driver's protection roof 3 is supported by driver's protection roof pillars 2.

Die Dachscheibe 4 besteht aus durchwurfhemmendem Verbundglas.The roof pane 4 consists of impact-resistant laminated glass.

Die Dachscheibe 4 ist erfindungsgemäß mit einer als transparentes Display 5 ausgebildeten Anzeigeeinrichtung zur Anzeige von Informationen für den Fahrer 7 versehen. Das transparente Display 5 ist oben oder unten an der Dachscheibe 5 angeordnet, beispielswiese aufgeklebt. Alternativ kann das transparente Display 5 in die Dachscheibe 4 integriert werden, beispielsweise zwischen zwei Scheiben einer aus mehreren Scheiben bestehenden Dachscheibe 4. An dem transparenten Display 5 erfolgt eine Anzeige von Informationen in fluoreszierendem Orange, Gelb oder Rot.According to the invention, the roof pane 4 is provided with a display device designed as a transparent display 5 for displaying information for the driver 7. The transparent display 5 is arranged at the top or bottom of the roof pane 5, for example glued on. Alternatively, the transparent display 5 can be integrated into the roof pane 4, for example between two panes of a roof pane 4 consisting of several panes. Information is displayed on the transparent display 5 in fluorescent orange, yellow or red.

Das Display 5 besteht beispielsweise aus einer OLED-Folie, die zwischen zwei übereinander geschichteten Glasscheiben der Dachscheibe 4 angeordnet ist.The display 5 consists, for example, of an OLED film which is arranged between two stacked glass panes of the roof pane 4.

Das transparente Display 5 ist im Sichtbereich 6 des nach oben auf ein angehobenes, nicht näher dargestelltes Lastaufnahmemittel blickenden Fahrers 7 positioniert. Auf diese Weise hat der Fahrer 7 die Möglichkeit, direkt nach oben durch die Dachscheibe 4 auf eine mittels eines nicht dargestellten Hubmastes mit einem anhebbaren Lastaufnahmemittel auf eine maximale Hubhöhe gehobene Last zu blicken und gleichzeitig das transparente Display 5 abzulesen. Somit hat der Fahrer 7 alle für die Lasthandhabung relevanten Informationen, beispielsweise Hubhöhe, Lastgewicht, Symbole eines Assistenzsystems, die an dem transparenten Display 5 angezeigt werden, auch bei großen Hubhöhen und damit steil nach oben durch die Dachscheibe 4 gerichtetem Blick in seinem direkten Sichtfeld und muss somit seine Blickrichtung nicht wechseln.The transparent display 5 is positioned in the field of vision 6 of the driver 7, who is looking up at a raised load-carrying device (not shown in detail). In this way, the driver 7 has the opportunity to look directly up through the roof window 4 at a load that has been lifted to a maximum lifting height by means of a lifting mast, not shown, with a liftable load-carrying device, and at the same time to read the transparent display 5. The driver 7 thus has all the information relevant to load handling, for example lifting height, load weight, symbols of an assistance system, which are displayed on the transparent display 5, even at large lifting heights and thus steeply upwards through the roof window 4 directed gaze in his direct field of vision and therefore does not have to change his direction of vision.

In der Figur 2 ist der Schubmaststapler aus Figur 1 in perspektivischer Sicht dargestellt. Dabei sind dieselben Merkmale mit denselben Bezugsziffern bezeichnet. Diese Ansicht zeigt den Blick des Fahrers 7 nach oben durch die Dachscheibe 4. Das transparente Display 5 befindet sich im Sichtbereich 6 des nach oben auf ein angehobenes, nicht näher dargestelltes Lastaufnahmemittel blickenden Fahrers 7.In the Figure 2 the reach truck is made of Figure 1 shown in perspective. The same features are designated with the same reference numbers. This view shows the driver 7 looking upwards through the roof window 4. The transparent display 5 is located in the field of vision 6 of the driver 7 looking upwards at a raised load-carrying device (not shown in detail).

Claims (10)

  1. Industrial truck, in particular forklift truck or reach truck, with a driver's workstation (1) and a driver's protective roof (3), which comprises an impact-resistant, transparent roof panel (4) for protecting the driver (7), characterized in that the roof panel (4) is provided with a display device, configured as a transparent display (5), for displaying information for the driver, wherein the display (5) is connected to an electronic control device of the industrial truck and is configured for displaying vehicle and/or load and/or assistance and/or navigation information, including one or more of the following items of information:
    • load weight of a load picked up
    • overload indication
    • vehicle information, in particular momentary lifting height and/or momentary travelling speed and/or momentary tilting angle of the load pick-up means
    • restrictive vehicle responses
    • directional or turning indication of a warehouse navigation system
    • order information of a warehouse management system
    • product information of a consignment transported
    • Internet browser
    • symbols of an assistance system, in particular of a lifting-height assistance system and/or a tilting-angle assistance system of the load pick-up means.
  2. Industrial truck according to Claim 1, characterized in that the transparent display (5) is adhesively attached to the roof panel (4).
  3. Industrial truck according to Claim 1, in that, in the case of a multi-layered configuration of the roof panel (4), the transparent display (5) is arranged between two panels.
  4. Industrial truck according to one of Claims 1 to 3, characterized in that the roof panel (4) consists of glass, in particular laminated glass.
  5. Industrial truck according to one of Claims 1 to 3, characterized in that the roof panel (4) consists of a plastics material.
  6. Industrial truck according to one of Claims 1 to 5, characterized in that the display (5) is configured as a transparent electroluminescent display (LED).
  7. Industrial truck according to one of Claims 1 to 5, characterized in that the display (5) is configured as a transparent thin-film electroluminescent display (TFT).
  8. Industrial truck according to one of Claims 1 to 5, characterized in that the display (5) is configured as a transparent organic electroluminescent display (OLED).
  9. Industrial truck according to one of Claims 1 to 8, characterized in that the display (5) extends substantially over the entire width of the roof panel (4) .
  10. Industrial truck according to one of Claims 1 to 9, characterized in that, in the case where the industrial truck is configured with a height-adjustable load pick-up means, the display (5) is arranged on the roof panel (4) in the driver's field of view (6) on the load part side, covering the highest adjustment range of the load pick-up means.
EP18202771.4A 2017-11-20 2018-10-26 Industrial truck with transparent display within driver protection roof Active EP3486209B1 (en)

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