EP2033932B1 - Forklift truck - Google Patents

Forklift truck Download PDF

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Publication number
EP2033932B1
EP2033932B1 EP08015253.1A EP08015253A EP2033932B1 EP 2033932 B1 EP2033932 B1 EP 2033932B1 EP 08015253 A EP08015253 A EP 08015253A EP 2033932 B1 EP2033932 B1 EP 2033932B1
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EP
European Patent Office
Prior art keywords
lifting
industrial truck
truck according
cylinders
frame
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Expired - Fee Related
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EP08015253.1A
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German (de)
French (fr)
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EP2033932A1 (en
Inventor
Paul Rickers
Michael Von Forstner
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Jungheinrich AG
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Jungheinrich AG
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    • 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
    • B66F9/08—Masts; Guides; Chains
    • 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

Definitions

  • the invention relates to a high-lift truck according to the preamble of patent claim 1.
  • High-lift trucks naturally require a high-lift device.
  • This is usually formed by height-adjustable masts.
  • the task of the masts is to take loads to be transported in different height positions or store and move the lifting load vertically.
  • Known masts consist in principle of an outer frame in which a load handling device moves directly, as in non-telescoping single mast. Such a construction is used only little. In most known cases, one or more masts move in the mast. Thus, triple or quadruple telescopic scaffolds have become known.
  • the individual mast frames usually consist of two lateral support profiles, which are connected at the top and bottom by transverse struts.
  • the transmission of the bending load resulting from the lifting load is carried out between the nested mast frames usually via rollers, which are arranged at the top and bottom of the mast frame profiles.
  • the drive for a height adjustment is usually by means of hydraulic lifting cylinder, which generate a relative movement between the individual mast frame.
  • the construction is such that the mast is rigid in its main loading direction. Excessive deformation leads to the longitudinal displacement of the center of gravity of the load and thus to an increase in the tilting torque acting on the industrial truck. As a result, the stability of the vehicle is negatively affected.
  • the necessary bending stiffness is achieved by the selection of lifting frame profiles with large area moments of inertia and by complex rear link constructions, which requires a considerable amount of material and thus a high weight and a great deal of effort.
  • a lateral bending which is caused by eccentric (asymmetrical) center of gravity of the lifting load or by dynamic lateral mass forces.
  • the lateral bending load can become dominant. Due to the resulting lateral bending of the mast, the lateral Hublasthebelarm is increased and thus also the increased lateral tilting moment.
  • the rigidity of the mast frame against lateral bending is usually achieved in that the two lateral support profiles of the mast frame by massive transverse reinforcements (ladder-shaped) are connected. The elaborate transverse stiffeners prevent visibility through the mast frame and increase its weight.
  • Out DE 101 33 585 A1 is a compensation device for a stationary mast of a mast known, which compensates for a caused by the load torque L Kunststoffsverbiegung.
  • DE 103 49 123 A1 is a hoist described, are applied to the two side-mounted lifting cylinder of a conventional mast with different hydraulic pressure to absorb lateral bending moments by a couple of forces.
  • JP 2003201095 A is a mast frame with solid support profiles known, which is adjustable by lifting cylinders in height.
  • WO 2006/063453 A discloses a platform which is height adjusted via a force transmitting scissors mechanism.
  • JP 7025597 A discloses a rigid frame supported by linear actuators. At one end of the frame hoists in the form of a pulley or the like are attached.
  • the invention has for its object to provide a high-lift truck, the lifting device suffers a minimal bending deformation in the longitudinal and transverse directions and yet characterized by a low cost of materials and good transparency properties.
  • At least three independently acting linear lifting drives are provided in the high-lift truck according to the invention, each of which has a lower, fixed in the linear direction and an upper, at least in the linear direction movable part.
  • the lower parts are connected to the frame so that their support points in the longitudinal and transverse directions the truck have a distance from each other, while their height-adjustable upper parts are connected to a rigid, preferably horizontal lifting platform.
  • a load fork of the load receiving device is attached by means of a lifting drive to the lifting platform, between the two front lifting cylinders, which are arranged symmetrically to the longitudinal axis of the truck.
  • the lifting device can be understood as Initialhub nails.
  • the basic idea of the invention is to counteract the load moments near their introduction region at the load-near end of the extended lifting device by force pairs. As a result, in the hoist on elongate rigid structures completely or partially be dispensed with.
  • the immovable lower parts of the lifting drives can have a guide for the load-receiving device.
  • the lifting drives are designed for receiving different axial forces. It is also provided according to a further embodiment of the invention that the lifting drives generate both tensile and compressive forces. In this way, it is also possible to pick up moments of loads whose point of application lies outside the area spanned by the lifting drives.
  • the stability of the lifting system is achieved by synchronous extension paths of the individual lifting drives.
  • a control or regulating device can be provided, which ensures that the extension paths of the individual linear actuators are the same.
  • the spatial angular position of the platform structure at the upper end of the linear actuators can serve instead of the extension paths.
  • a desired inclination of the lifting system can be adjusted.
  • the connection of the moving parts the lifting drives on the lifting platform is not rigid, but more or less articulated.
  • Lifting cylinders preferably hydraulic cylinders, are used as linear lifting devices for the lifting drives. To increase the achievable lifting height telescopic arrangements are preferably used.
  • the hydraulic cylinders may be hinged to the frame and platform as in a hexapod. They are then inclined to the vertical.
  • a further horizontal connecting structure is provided at the upper end of the stationary part of the lifting drives to effect a suitable stiffening.
  • This can also serve as a protective roof for a cab of the truck.
  • FIG. 1 a high-lift truck 10 can be seen with a vehicle frame 12, which is on a four-wheel drive 14 and on which a control and regulating device is arranged for a lifting drive.
  • a vehicle frame 12 On the front end of the vehicle frame 12, two lifting cylinders 16, 18 are supported.
  • Another lifting cylinder 20 is supported at the rear end of the vehicle frame 12.
  • the lifting cylinders 16, 18 are arranged symmetrically to the longitudinal axis of the vehicle 10, wherein the rear lifting cylinder 20 is arranged on the longitudinal axis.
  • the piston rods of the lifting cylinders 16 to 20 are connected to a lifting platform 22. The connection is more or less articulated.
  • the lifting cylinders 16 to 20 are double-acting, ie they can generate both tensile and compressive forces.
  • the actuation of the lifting cylinders 16, 18 and 20 is effected by a hydraulic supply system and a control or regulating device, not shown, which ensure that the lifting cylinders are extended synchronously.
  • a control variable for example, the path of the piston rods or the platform can be selected.
  • the spatial angular position of the platform 22 can serve.
  • a load-receiving means in the form of a forklift 24 is attached by an Initialhub issued 26 on the lifting platform 22 between the lifting cylinders 16, 18.
  • a further connection structure can be provided at the upper end, which at the same time forms a driver's protection roof.
  • a guide can be provided for the load-carrying means on the fixed parts of the lifting cylinders 16, 18.
  • FIG. 2 It can be seen how the load fork 24 between the cylinders 16, 18 can be performed, for example by rollers 34 or other guide means.

Description

Die Erfindung bezieht sich auf ein Hochhubflurförderzeug nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a high-lift truck according to the preamble of patent claim 1.

Hochhubflurförderzeuge benötigen naturgemäß eine Hochhubeinrichtung. Diese wird üblicherweise von höhenverstellbaren Hubgerüsten gebildet. Aufgabe der Hubgerüste ist, zu transportierende Lasten in unterschiedlichen Höhenpositionen aufzunehmen oder abzulegen und die Hublast vertikal zu bewegen.High-lift trucks naturally require a high-lift device. This is usually formed by height-adjustable masts. The task of the masts is to take loads to be transported in different height positions or store and move the lifting load vertically.

Bekannte Hubgerüste bestehen im Prinzip aus einem äußeren Standrahmen, in dem sich unmittelbar ein Lastaufnahmemittel bewegt, wie beim nicht teleskopierenden Einfachmast. Eine derartige Konstruktion wird nur noch wenig angewendet. In den meisten bekannten Fällen bewegen sich im Standmast ein oder mehrere Masten. So sind Dreifach- oder auch Vierfach-Teleskopgerüste bekannt geworden.Known masts consist in principle of an outer frame in which a load handling device moves directly, as in non-telescoping single mast. Such a construction is used only little. In most known cases, one or more masts move in the mast. Thus, triple or quadruple telescopic scaffolds have become known.

Die einzelnen Mastrahmen bestehen zumeist aus zwei seitlichen Tragprofilen, die am oberen und unteren Ende durch Querstreben verbunden sind. Die Übertragung des aus der Hublast sich ergebenden Biegemoments erfolgt zwischen den ineinander verschachtelten Mastrahmen üblicherweise über Laufrollen, die am oberen und unteren Ende der Mastrahmenprofile angeordnet sind. Der Antrieb für eine Höhenverstellung erfolgt normalerweise mittels hydraulischer Hubzylinder, die eine Relativbewegung zwischen den einzelnen Hubmastrahmen erzeugen.The individual mast frames usually consist of two lateral support profiles, which are connected at the top and bottom by transverse struts. The transmission of the bending load resulting from the lifting load is carried out between the nested mast frames usually via rollers, which are arranged at the top and bottom of the mast frame profiles. The drive for a height adjustment is usually by means of hydraulic lifting cylinder, which generate a relative movement between the individual mast frame.

Damit sich durch das Biegemoment einer sich in mehr oder weniger großer Höhe befindlichen Last das Hubgerüst möglichst wenig verformt, ist die Konstruktion so beschaffen, dass das Hubgerüst in seiner Hauptbelastungsrichtung biegesteif ist. Eine zu große Verformung führt zur Längsverschiebung des Lastschwerpunkts und damit zur Vergrößerung des auf das Flurförderzeug wirkenden Kippmoments. Hierdurch wird die Standsicherheit des Fahrzeugs negativ beeinflusst. Die notwendige Biegesteifigkeit wird durch die Auswahl von Hubrahmenprofilen mit großen Flächenträgheitsmomenten und durch aufwendige Hinterzugkonstruktionen erreicht, was einen erheblichen Materialeinsatz und damit ein hohes Gewicht und einen großen Aufwand bedingt.So that the mast deforms as little as possible by the bending moment of a load which is more or less high, the construction is such that the mast is rigid in its main loading direction. Excessive deformation leads to the longitudinal displacement of the center of gravity of the load and thus to an increase in the tilting torque acting on the industrial truck. As a result, the stability of the vehicle is negatively affected. The necessary bending stiffness is achieved by the selection of lifting frame profiles with large area moments of inertia and by complex rear link constructions, which requires a considerable amount of material and thus a high weight and a great deal of effort.

Neben der Hauptbiegebelastung kann außerdem eine seitliche Biegung auftreten, die durch exzentrische (unsymmetrische) Schwerpunktlage der Hublast oder durch dynamische seitliche Massenkräfte hervorgerufen wird. Speziell bei sogenannten Schmalgang-Gabelstaplern, die für die Aufnahme seitlich zur Fahrzeugachse versetzten Lasten eingerichtet sind, kann die seitliche Biegebelastung dominant werden. Durch die resultierende seitliche Verbiegung des Hubmastes wird der seitliche Hublasthebelarm vergrößert und damit auch das seitliche Kippmoment erhöht. Die Steifigkeit der Hubmastrahmen gegen seitliche Verbiegung wird üblicherweise dadurch erreicht, dass die beiden seitlichen Tragprofile des Hubmastrahmens durch massive Querversteifungen (leiterförmig) verbunden werden. Die aufwendigen Querversteifungen verhindern die Sicht durch den Hubmastrahmen und vergrößern dessen Gewicht.In addition to the main bending load may also occur a lateral bending, which is caused by eccentric (asymmetrical) center of gravity of the lifting load or by dynamic lateral mass forces. Especially in so-called narrow-aisle forklifts, which are set up for receiving laterally offset to the vehicle axle loads, the lateral bending load can become dominant. Due to the resulting lateral bending of the mast, the lateral Hublasthebelarm is increased and thus also the increased lateral tilting moment. The rigidity of the mast frame against lateral bending is usually achieved in that the two lateral support profiles of the mast frame by massive transverse reinforcements (ladder-shaped) are connected. The elaborate transverse stiffeners prevent visibility through the mast frame and increase its weight.

Aus DE 40 38 730 A1 ist eine Vorrichtung bekannt geworden, welche die aus der Verformung des Hubgerüstes durch das Lastmoment resultierende Verlagerung des Lastschwerpunktes durch Neigung des Gerüstes kompensiert. Die seitliche Verbiegung des Hubgerüstes kann durch diese Vorrichtung nicht beeinflusst werden.Out DE 40 38 730 A1 a device has become known which compensates for the resulting from the deformation of the mast by the load torque displacement of the load center by tilting the framework. The lateral bending of the mast can not be influenced by this device.

Aus DE 101 33 585 A1 ist eine Kompensationsvorrichtung für einen Standmast eines Hubgerüstes bekannt geworden, welche eine durch das Lastmoment verursachte Längsverbiegung ausgleicht.Out DE 101 33 585 A1 is a compensation device for a stationary mast of a mast known, which compensates for a caused by the load torque Längsverbiegung.

In DE 103 49 123 A1 ist ein Hubwerk beschrieben, mit dem zwei seitlich angeordnete Hubzylinder eines konventionellen Hubmastes mit unterschiedlichem Hydraulikdruck beaufschlagt werden, um seitliche Biegemomente durch ein Kräftepaar aufzunehmen.In DE 103 49 123 A1 is a hoist described, are applied to the two side-mounted lifting cylinder of a conventional mast with different hydraulic pressure to absorb lateral bending moments by a couple of forces.

Aus DE 10 2005 050 733 A1 ist bekannt geworden, durch Regelung zweier unabhängiger Hubantriebe eine seitliche Verformung eines Hubmastes zu kompensieren.Out DE 10 2005 050 733 A1 It has become known to compensate for lateral deformation of a lifting mast by controlling two independent hoist drives.

Aus DE 30 16 156 oder DE 31 01 953 sind Hubgerüste bekannt geworden, bei denen Längs- und Seitenverformungen durch Gegenmomente kompensiert werden, die über Zugmittel auf das Hubgerüst wirken. Die Hubgerüste müssen hierfür mit sehr aufwendigen Zusatzmechanismen ausgerüstet werden.Out DE 30 16 156 or DE 31 01 953 masts have become known in which longitudinal and lateral deformations are compensated by counter-moments acting on traction means on the mast. The masts have to be equipped for this with very expensive additional mechanisms.

Aus JP 2003201095 A ist ein Hubmastrahmen mit massiven Tragprofilen bekannt, der von Hubzylindern in der Höhe verstellbar ist. WO 2006/063453 A offenbart eine Plattform, die über einen Kraft übertragenden Scherenmechanismus in der Höhe verstellt wird. JP 7025597 A offenbart einen steifen Rahmen, der von linearen Stellantrieben abgestützt ist. Am einen Ende des Rahmens sind Hebezeuge in Form eines Flaschenzugs oder dergleichen angehängt.Out JP 2003201095 A is a mast frame with solid support profiles known, which is adjustable by lifting cylinders in height. WO 2006/063453 A discloses a platform which is height adjusted via a force transmitting scissors mechanism. JP 7025597 A discloses a rigid frame supported by linear actuators. At one end of the frame hoists in the form of a pulley or the like are attached.

Der Erfindung liegt die Aufgabe zugrunde, ein Hochhubflurförderzeug zu schaffen, dessen Hubvorrichtung eine minimale Biegeverformung in Längs- und Querrichtung erleidet und sich gleichwohl durch einen geringen Materialaufwand und durch gute Durchsichteigenschaften auszeichnet.The invention has for its object to provide a high-lift truck, the lifting device suffers a minimal bending deformation in the longitudinal and transverse directions and yet characterized by a low cost of materials and good transparency properties.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Wie im Stand der Technik sind bei dem erfindungsgemäßen Hochhubflurförderzeug mindestens drei unabhängig wirkende lineare Hubantriebe vorgesehen, von denen jeder einen unteren, in linearer Richtung feststehenden und einen oberen, zumindest in linearer Richtung beweglichen Teil aufweist. Die unteren Teile sind mit dem Rahmen so verbunden, dass ihre Abstützpunkte in Längs- und Querrichtung des Flurförderzeuges einen Abstand voneinander haben, während ihre höhenverstellbaren oberen Teile mit einer steifen, vorzugsweise horizontalen Hubplattform verbunden sind. Eine Lastgabel der Lastaufnahmevorrichtung ist mittels eines Hubantriebs an der Hubplattform angehängt, und zwar zwischen den beiden vorderen Hubzylindern, die symmetrisch zur Längsachse des Flurförderzeugs angeordnet sind. Die Hubeinrichtung kann als Initialhubeinrichtung verstanden werden.As in the prior art, at least three independently acting linear lifting drives are provided in the high-lift truck according to the invention, each of which has a lower, fixed in the linear direction and an upper, at least in the linear direction movable part. The lower parts are connected to the frame so that their support points in the longitudinal and transverse directions the truck have a distance from each other, while their height-adjustable upper parts are connected to a rigid, preferably horizontal lifting platform. A load fork of the load receiving device is attached by means of a lifting drive to the lifting platform, between the two front lifting cylinders, which are arranged symmetrically to the longitudinal axis of the truck. The lifting device can be understood as Initialhubeinrichtung.

Der Grundgedanke der Erfindung ist, den Lastmomenten nahe ihres Einleitungsbereichs am lastnahen Ende der ausgefahrenen Hubeinrichtung durch Kräftepaare zu begegnen. Dadurch kann im Hubwerk auf langgestreckte biegesteife Strukturen ganz oder teilweise verzichtet werden.The basic idea of the invention is to counteract the load moments near their introduction region at the load-near end of the extended lifting device by force pairs. As a result, in the hoist on elongate rigid structures completely or partially be dispensed with.

Nach einer weiteren Ausgestaltung der Erfindung können die unbeweglichen unteren Teile der Hubantriebe eine Führung für die Lastaufnahmevorrichtung aufweisen.According to a further embodiment of the invention, the immovable lower parts of the lifting drives can have a guide for the load-receiving device.

Nach einer weiteren Ausgestaltung der Erfindung sind die Hubantriebe für die Aufnahme unterschiedlicher Axialkräfte ausgelegt. Außerdem ist nach einer weiteren Ausgestaltung der Erfindung vorgesehen, dass die Hubantriebe sowohl Zug- als auch Druckkräfte erzeugen. Damit können auch Momente von Lasten aufgenommen werden, deren Angriffspunkt außerhalb der von den Hubantrieben aufgespannten Fläche liegen.According to a further embodiment of the invention, the lifting drives are designed for receiving different axial forces. It is also provided according to a further embodiment of the invention that the lifting drives generate both tensile and compressive forces. In this way, it is also possible to pick up moments of loads whose point of application lies outside the area spanned by the lifting drives.

Nach einer weiteren Ausgestaltung der Erfindung wird die Stabilität des Hubsystems durch synchrone Ausfahrwege der einzelnen Hubantriebe erreicht. Hierzu kann eine Steuer- oder Regeleinrichtung vorgesehen werden, wobei diese dafür sorgt, dass die Ausfahrwege der einzelnen Hubantriebe gleich sind. Als Regelgröße kann statt der Ausfahrwege auch die räumliche Winkellage der Plattformstruktur am oberen Ende der Hubantriebe dienen. In diesem Fall kann auch eine gewollte Neigung des Hubsystems eingestellt werden. Für die Einstellung einer Neigung ist jedoch obligatorisch, daß die Anbindung der beweglichen Teile die Hubantriebe an der Hubplattform nicht starr ist, sondern mehr oder weniger gelenkig.According to a further embodiment of the invention, the stability of the lifting system is achieved by synchronous extension paths of the individual lifting drives. For this purpose, a control or regulating device can be provided, which ensures that the extension paths of the individual linear actuators are the same. As a controlled variable, the spatial angular position of the platform structure at the upper end of the linear actuators can serve instead of the extension paths. In this case, a desired inclination of the lifting system can be adjusted. However, for the adjustment of an inclination is mandatory that the connection of the moving parts, the lifting drives on the lifting platform is not rigid, but more or less articulated.

Für die Hubantriebe werden Hubzylinder, vorzugsweise Hydraulikzylinder, als lineare Hubvorrichtungen verwendet. Zur Vergrößerung der erzielbaren Hubhöhe werden vorzugsweise Teleskopanordnungen eingesetzt. Die Hydraulikzylinder können wie bei einem Hexapoden an dem Rahmen und der Plattform angelenkt sein. Sie sind dann zur Vertikalen geneigt.Lifting cylinders, preferably hydraulic cylinders, are used as linear lifting devices for the lifting drives. To increase the achievable lifting height telescopic arrangements are preferably used. The hydraulic cylinders may be hinged to the frame and platform as in a hexapod. They are then inclined to the vertical.

Nach einer anderen Ausgestaltung der Erfindung ist am oberen Ende des unbeweglichen Teils der Hubantriebe eine weitere horizontale Verbindungsstruktur vorgesehen, um eine geeignete Versteifung zu bewirken. Diese kann auch als Schutzdach für eine Fahrerkabine des Flurförderzeugs dienen.According to another embodiment of the invention, a further horizontal connecting structure is provided at the upper end of the stationary part of the lifting drives to effect a suitable stiffening. This can also serve as a protective roof for a cab of the truck.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand von Zeichnungen erläutert.

Figur 1
zeigt perspektivisch ein Hochhubflurförderzeug nach der Erfindung in schematischer Darstellung.
Figur 2
zeigt schematisch die Führung der Lastgabel nach Figur 1.
An embodiment of the invention will be explained below with reference to drawings.
FIG. 1
shows in perspective a high-lift truck according to the invention in a schematic representation.
FIG. 2
schematically shows the leadership of the fork after FIG. 1 ,

In der Figur 1 ist ein Hochhubflurförderzeug 10 zu erkennen mit einem Fahrzeugrahmen 12, der auf einem Vierradfahrwerk 14 steht und an dem eine Regel- und Steuervorrichtung für einen Hubantrieb angeordnet ist. Auf dem vorderen Ende des Fahrzeugrahmens 12 sind zwei Hubzylinder 16, 18 abgestützt. Ein weiterer Hubzylinder 20 ist am hinteren Ende des Fahrzeugrahmens 12 abgestützt. Die Hubzylinder 16, 18 sind symmetrisch zur Längsachse des Fahrzeugs 10 angeordnet, wobei der hintere Hubzylinder 20 auf der Längsachse angeordnet ist. Die Kolbenstangen der Hubzylinder 16 bis 20 sind mit einer Hubplattform 22 verbunden. Die Verbindung ist dabei mehr oder weniger gelenkig. Die Hubzylinder 16 bis 20 sind doppelwirkend, d.h. sie können sowohl Zug- als auch Druckkräfte erzeugen. Die Betätigung der Hubzylinder 16, 18 und 20 erfolgt durch ein hydraulisches Versorgungssystem und eine nicht gezeigte Steuer- oder Regelvorrichtung, welche dafür sorgen, dass die Hubzylinder synchron ausgefahren werden. Als Regelgröße kann z.B. der Weg der Kolbenstangen bzw. der Plattform gewählt werden. Alternativ kann auch die räumliche Winkellage der Plattform 22 dienen.In the FIG. 1 is a high-lift truck 10 can be seen with a vehicle frame 12, which is on a four-wheel drive 14 and on which a control and regulating device is arranged for a lifting drive. On the front end of the vehicle frame 12, two lifting cylinders 16, 18 are supported. Another lifting cylinder 20 is supported at the rear end of the vehicle frame 12. The lifting cylinders 16, 18 are arranged symmetrically to the longitudinal axis of the vehicle 10, wherein the rear lifting cylinder 20 is arranged on the longitudinal axis. The piston rods of the lifting cylinders 16 to 20 are connected to a lifting platform 22. The connection is more or less articulated. The lifting cylinders 16 to 20 are double-acting, ie they can generate both tensile and compressive forces. The actuation of the lifting cylinders 16, 18 and 20 is effected by a hydraulic supply system and a control or regulating device, not shown, which ensure that the lifting cylinders are extended synchronously. As a control variable, for example, the path of the piston rods or the platform can be selected. Alternatively, the spatial angular position of the platform 22 can serve.

Ein Lastaufnahmemittel in Form einer Lastgabel 24 ist von einer Initialhubeinrichtung 26 an der Hubplattform 22 zwischen den Hubzylindern 16, 18 angehängt.A load-receiving means in the form of a forklift 24 is attached by an Initialhubeinrichtung 26 on the lifting platform 22 between the lifting cylinders 16, 18.

An den feststehenden Zylindern der Hubzylinder 16, 18 kann am oberen Ende eine weitere Verbindungsstruktur vorgesehen werden, welche zugleich ein Fahrerschutzdach bildet. Außerdem kann an den feststehenden Teilen der Hubzylinder 16, 18 eine Führung vorgesehen werden für das Lastaufnahmemittel.At the fixed cylinders of the lifting cylinders 16, 18, a further connection structure can be provided at the upper end, which at the same time forms a driver's protection roof. In addition, a guide can be provided for the load-carrying means on the fixed parts of the lifting cylinders 16, 18.

In Figur 2 ist zu erkennen, wie die Lastgabel 24 zwischen den Zylindern 16, 18 geführt werden kann, beispielsweise durch Rollen 34 oder auch andere Führungsmittel.In FIG. 2 It can be seen how the load fork 24 between the cylinders 16, 18 can be performed, for example by rollers 34 or other guide means.

Claims (10)

  1. A high-lift industrial truck, wherein a load pick-up device (24, 26) can be brought to desired positions of height by means of a linearly working lifting device (26), the lifting device being supported on a frame (12) of the industrial truck, and wherein linearly working lifting drives (16, 18, 20) acting independently are provided with a lower part, fixed in the linear direction, and an upper part, movable in the linear direction, and wherein the lower parts are attached to the frame (12) such that their support points have a distance from each other in the longitudinal and the transversal direction of the industrial truck (10), whereas their height-adjustable upper parts are connected to a stiff lifting platform (22), wherein the stiff lifting platform (22) is supported via three linear lifting drives, working independently form each other and constructed as lifting cylinders (16, 18, 20), and two lifting cylinders (16, 18) are supported on the front end of the frame (12) and arranged symmetrically to the longitudinal axis of the industrial truck, characterised in that the load pick-up device (24, 26) comprises a load fork (24), which is attached to the lifting platform (22) by means of a lifting drive (26) between the two lifting cylinders (16, 18) that are supported on the front end of the frame (12) and arranged symmetrically to the longitudinal axis of the industrial truck.
  2. The industrial truck according to claim 1, characterised in that one lifting cylinder (20) is arranged in the rear area of the frame (12).
  3. An industrial truck according to claim 1 or 2, characterised in that the linearly immobile lower vertical parts of the lifting cylinders (16, 18, 20) comprise a guiding for the load pick-up device.
  4. An industrial truck according to any one of claims 1 to 3, characterised in that the lifting cylinders (16, 18, 20) are dimensioned for taking up different axial forces.
  5. An industrial truck according to any one of claims 1 to 4, characterised in that the lifting cylinders (16, 18, 20) are dimensioned for generating pressure forces and tensile forces.
  6. An industrial truck according to any one of claims 1 to 5, characterised in that a command- and regulating device for the lifting cylinders (16, 18, 20) is provided in order to generate synchronous extension paths of the lifting drives.
  7. The industrial truck according to claim 6, characterised in that the extension path or the spatial angular position of the platform (22) serves as controlled variable.
  8. An industrial truck according to any one of claims 1 to 7, characterised in that the upper ends of the fixed part of the lifting cylinders (16, 18, 20) are connected by a horizontal connecting structure.
  9. The industrial truck according to claim 8, characterised in that the connecting structure forms a protection roof for a driver cabin.
  10. An industrial truck according to any one of claims 1 to 9, characterised in that hydraulic cylinders are provided as linear lifting cylinders (16, 18, 20).
EP08015253.1A 2007-09-08 2008-08-29 Forklift truck Expired - Fee Related EP2033932B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710042878 DE102007042878A1 (en) 2007-09-08 2007-09-08 Hochhubflurförderzeug

Publications (2)

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EP2033932A1 EP2033932A1 (en) 2009-03-11
EP2033932B1 true EP2033932B1 (en) 2015-07-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08015253.1A Expired - Fee Related EP2033932B1 (en) 2007-09-08 2008-08-29 Forklift truck

Country Status (3)

Country Link
EP (1) EP2033932B1 (en)
CN (1) CN101417777B (en)
DE (1) DE102007042878A1 (en)

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CN102745623A (en) * 2012-06-29 2012-10-24 安徽德摩新能源叉车股份有限公司 Hydraulic carrier
DE202014004566U1 (en) 2014-05-30 2014-07-16 Friedrich Ganzmann Lifting device for coupling to the changing devices of Hofladern, front loaders and three-point linkage to increase the lifting height of the implements
CN108454674A (en) * 2018-05-18 2018-08-28 陈芳 A kind of transport carriage of high-pressure vacuum breaker
CN112661060B (en) * 2020-12-14 2022-03-22 湖南工程学院 Novel work of fine arts hangs show device
CN115417044A (en) * 2020-12-31 2022-12-02 深圳市海柔创新科技有限公司 Lifting device and transfer robot

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Also Published As

Publication number Publication date
EP2033932A1 (en) 2009-03-11
CN101417777A (en) 2009-04-29
CN101417777B (en) 2014-10-01
DE102007042878A1 (en) 2009-03-12

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