EP2128076B1 - Lifting assembly for an industrial truck - Google Patents

Lifting assembly for an industrial truck Download PDF

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Publication number
EP2128076B1
EP2128076B1 EP20090005663 EP09005663A EP2128076B1 EP 2128076 B1 EP2128076 B1 EP 2128076B1 EP 20090005663 EP20090005663 EP 20090005663 EP 09005663 A EP09005663 A EP 09005663A EP 2128076 B1 EP2128076 B1 EP 2128076B1
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EP
European Patent Office
Prior art keywords
eccentric
lifting
load
fork
lifting carriage
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EP20090005663
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German (de)
French (fr)
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EP2128076A1 (en
Inventor
Patrick Streiff
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Still SpA
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Om Carrelli Elevatori SpA
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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
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/16—Platforms; Forks; Other load supporting or gripping members inclinable relative to mast
    • 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

Definitions

  • the invention relates to a lifting arrangement for an industrial truck with a along a mast by means of guide rollers up and down movably guided lifting carriage on which a fork is attached, which is aligned in the unloaded state substantially parallel to a road surface and the elastic by the weight of a recorded load is deformable, wherein at least one guide roller is adjustably mounted on the lifting carriage, such that the position of the lifting relative to the mast is automatically changed due to the weight of a recorded load, so that an elastic deformation of the fork is at least partially compensated or overcompensated, wherein the at least an adjustable guide roller is mounted by means of an eccentric on the lifting and a spring element is provided which predetermines the position of the lifting relative to the mast with not loaded forklift.
  • Industrial trucks are vehicles for in-house transport of goods, which are usually used for transporting and stacking goods on pallets or in lattice boxes.
  • the fork is attached to a lifting carriage, which can be raised and lowered along a mast.
  • the lifting slide on guide rollers, which are guided in a profile of the mast.
  • an upper pair of guide rollers and a lower pair of guide rollers are provided.
  • the two roles of a pair of guide rollers are usually arranged coaxially to each other.
  • the load fork and the lifting carriage can be formed here by separate components or by a common component.
  • the inclination of the fork is usually not actively adjustable.
  • the fork in the unloaded state slightly inclined upwards.
  • this inclination of the forklift upward makes it difficult to retract the unloaded forklift into a pallet or lattice box.
  • the lifting arrangement comprises a liftable in a mast lifting, the lower guide rollers are mounted in each case an eccentric on the lifting.
  • the eccentrics are each provided with a forward-pointing lever arm.
  • the lever arms of the two eccentrics are articulated to a cross between the two eccentrics arranged crossbar.
  • On the crossbar lower ends are supported by compression springs which engage with the upper ends of a transverse plate of the lifting carriage.
  • the compression springs act on the eccentric by means of a lever arm against a stop of the lifting carriage. At the crossbar load chains are still articulated.
  • the present invention has for its object to provide a lifting arrangement for a truck available, with the undesirable inclination of the fork is avoided in a simple manner.
  • the spring element is supported on the one hand on the lifting carriage and on the other hand acts directly on the eccentric and a traction means of the mast acts on the eccentric and is secured to the eccentric.
  • the adjustable guide roller - or the adjustable guide roller pair - changes its position relative to the lifting depending on from the weight of a load on the fork. This is done by a mechanical force deflection. The greater the weight of a load on the forklift, the more the lift tilts backwards - the tips of the forks of the forks thereby move upward, counter to the direction of elastic deformation by the weight of the load.
  • at least one adjustable guide roller is mounted on the lifting carriage by means of an eccentric.
  • the spring element indicates the position of the lifting relative to the mast with unloaded fork.
  • the spring element biases the lifting carriage into a position in which the tines of the unloaded load fork are substantially horizontal.
  • the spring element acts between the lifting and the eccentric, wherein it holds the eccentric in an end position.
  • the spring element engages on the one hand on the lifting and on the other hand on the eccentric.
  • the spring element exerts a force on the eccentric and is supported on the lifting carriage.
  • the mast has two traction means, wherein a traction means acts on each of the two eccentrics and thus on both guide rollers of the pair of guide rollers.
  • the eccentric is rotatably mounted in this case according to an advantageous embodiment of the invention about a first eccentric axis on the lifting and the guide roller is rotatably mounted about a second eccentric axis on the eccentric, wherein the first eccentric axis and the second eccentric axis are spaced apart in parallel.
  • the spring element is arranged such that the weight force of a load located on the load fork causes an elastic deformation of the spring element.
  • the eccentric is moved by the weight against the force of the spring element out of its final position.
  • a part of the surface of the eccentric is designed as a rolling surface for the traction means.
  • a smaller or larger section of the traction means engages the rolling surface.
  • the rolling surface can be formed, for example, as a part-circular path, whose central axis is the first eccentric axis. This ensures that the lever arm, with the the force of the traction means acting on the eccentric, regardless of the rotational position of the eccentric is always the same.
  • the eccentric has a first, preferably adjustable stop, which determines the position of the eccentric with unloaded fork. This first stop comes with unloaded fork on a component of the lifting or on a component of the fork to the plant.
  • the eccentric on a second, preferably adjustable stop, which determines the position of the eccentric at maximum laden fork.
  • the second stop is at maximum laden fork on a component of the lifting or on a component of the fork to the plant.
  • FIG. 1 shows a generic, designed as a pedestrian-controlled stacker truck.
  • the truck has a drive part with a steerable drive wheel 11.
  • the drive wheel 11 can be steered by pivoting a steering arm 12 about a vertical axis.
  • the truck On the load side, the truck has two non or only slightly height adjustable wheel arms 13, each with a roller 14th
  • a hoist of the truck comprises an upwardly telescopically extendable mast 15.
  • a lifting 16 is guided with a pair of lower guide rollers 17 and a pair of upper guide rollers 18 in a profile of the mast 15.
  • On the lifting 16 a fork 19 is attached, which is moved together with the lifting 16 up and down.
  • In the illustrated lower end position of the forks 17 are a U-shaped profile having forks lowered the fork 17 on the wheel arms 13 and enclose the wheel arms 13 from above.
  • Dashed lines show the lifting carriage 16a, the lower guide rollers 17a, the upper guide rollers 18a and the load fork 19a in a raised position.
  • a storage rack 20 is shown with two pallets 21 parked therein. It can be seen how, by moving the truck according to the right in the drawing, the fork 19 can be moved into the lower or in the upper pallet.
  • the forks of the unloaded fork 19 are aligned parallel to the road surface and thus parallel to the entry openings of the pallets 21. Adjusting the height of the fork 19 and the retraction of the fork 19 in the pallet is particularly simple.
  • FIG. 2 shows the lifting arrangement according to the invention in the unloaded state.
  • the forks of the fork 19 parallel to the road.
  • the plane defined by the center axes of the guide rollers 17, 18 is perpendicular to the fork tines 19.
  • the lower guide rollers 17 are mounted directly on the lifting carriage 16.
  • the upper guide rollers 18, however, are mounted on an eccentric 1, which in turn is rotatably mounted on the lifting carriage 16.
  • a designed as a load chain traction means 2 which receives the weight of the fork 19, engages the eccentric 1 at.
  • the eccentric 1 is rotatably mounted on the lifting carriage 16 on a first eccentric axis 3.
  • the guide roller 18 is mounted on the eccentric 1.
  • the two eccentric axes 3, 4 are exactly above the other at a distance D.
  • This position of the eccentric 1 is defined by a first stop 5, which is fixed to the eccentric 1 and rests against a component of the lifting carriage 16. In this position, the eccentric 1 is held by a spring element 7, which is supported on the lifting carriage 16 and exerts on the eccentric 1 a torque in the counterclockwise direction.
  • the traction means 2 also acts on the eccentric 1, is deflected on a rolling surface of the eccentric 1 and is then guided in the mast 15 upwards.
  • the force acting on the traction means 2 tensile force, the size of which depends on the weight of a load located on the fork 19, exerts on the eccentric 1 a torque in a clockwise direction.
  • the torque applied by the traction means 2 is smaller than the torque applied by the spring element 7, so that the eccentric 1 is in the end position defined by the stop 5.
  • FIGS. 4 and 5 the same arrangement is shown with a load located on the fork 19 load 30.
  • the force exerted by the traction means 2 on the eccentric 1 torque is now so large that the eccentric 1 is rotated counter to the force of the spring element 7 in the clockwise direction until the second stopper 6 comes to rest on the lifting 16.
  • the first eccentric axis 3, which connects the eccentric 1 with the lifting slide 16, is now offset to the left in the drawing relative to the second eccentric axis 4.
  • the lifting 16 and the fork 19 are hereby pivoted in total counterclockwise, so that the tips of the forks are offset upwards.
  • the loaded fork 19 is therefore tilted backwards.
  • the elastic deformation of the lifting assembly is balanced due to the weight of the load 30 and even slightly overcompensated.
  • the deflection of the eccentric 1 is dependent on the weight of the load located on the fork 19 load. In the case of moderate load, the position of the eccentric 1 adjusts to a position between the end positions defined by the stops 5, 6.
  • the stops 5, 6 are adjustable, so that the horizontal position and the maximum inclination of the fork 19 can be adjusted during assembly of the lifting arrangement.

Description

Die Erfindung betrifft eine Hubanordnung für ein Flurförderzeug mit einem entlang eines Hubgerüsts mittels Führungsrollen auf- und abbewegbar geführten Hubschlitten, an dem eine Lastgabel befestigt ist, welche in unbeladenem Zustand im Wesentlichen parallel zu einer Fahrbahnoberfläche ausgerichtet ist und die durch die Gewichtskraft einer aufgenommenen Last elastisch verformbar ist, wobei mindestens eine Führungsrolle verstellbar an dem Hubschlitten gelagert ist, derart, dass die Position des Hubschlittens relativ zum Hubgerüst aufgrund der Gewichtskraft einer aufgenommenen Last selbsttätig veränderbar ist, sodass eine elastische Verformung der Lastgabel zumindest teilweise kompensierbar oder überkompensierbar ist, wobei die mindestens eine verstellbare Führungsrolle mittels eines Exzenters an dem Hubschlitten gelagert ist und ein Federelement vorgesehen ist, das bei nicht beladener Lastgabel die Position des Hubschlittens relativ zum Hubgerüst vorgibt.The invention relates to a lifting arrangement for an industrial truck with a along a mast by means of guide rollers up and down movably guided lifting carriage on which a fork is attached, which is aligned in the unloaded state substantially parallel to a road surface and the elastic by the weight of a recorded load is deformable, wherein at least one guide roller is adjustably mounted on the lifting carriage, such that the position of the lifting relative to the mast is automatically changed due to the weight of a recorded load, so that an elastic deformation of the fork is at least partially compensated or overcompensated, wherein the at least an adjustable guide roller is mounted by means of an eccentric on the lifting and a spring element is provided which predetermines the position of the lifting relative to the mast with not loaded forklift.

Flurförderzeuge sind Fahrzeuge zum innerbetrieblichen Warentransport, die in der Regel zum Transportieren und Stapeln von auf Paletten oder in Gitterboxen befindlichen Waren eingesetzt werden. Mit zwei im Wesentlichen horizontal ausgerichteten Gabelzinken der Lastgabel kann die Palette oder die Gitterbox unterfahren und anschließend angehoben werden. Die Lastgabel ist an einem Hubschlitten befestigt, welcher entlang eines Hubgerüsts anhebbar und absenkbar ist. Hierzu weist der Hubschlitten Führungsrollen auf, die in einem Profil des Hubgerüsts geführt sind. In der Regel sind ein oberes Führungsrollenpaar und ein unteres Führungsrollenpaar vorgesehen. Die beiden Rollen eines Führungsrollenpaares sind in der Regel koaxial zueinander angeordnet. Die Lastgabel und der Hubschlitten können hierbei von getrennten Bauteilen oder von einem gemeinsamen Bauteil gebildet sein.Industrial trucks are vehicles for in-house transport of goods, which are usually used for transporting and stacking goods on pallets or in lattice boxes. With two substantially horizontally oriented forks of the fork, the pallet or the grid box can be driven under and then raised. The fork is attached to a lifting carriage, which can be raised and lowered along a mast. For this purpose, the lifting slide on guide rollers, which are guided in a profile of the mast. As a rule, an upper pair of guide rollers and a lower pair of guide rollers are provided. The two roles of a pair of guide rollers are usually arranged coaxially to each other. The load fork and the lifting carriage can be formed here by separate components or by a common component.

Größere Flurförderzeuge, wie beispielsweise Gegengewichtsgabelstapler weisen eine von einer Bedienperson des Flurförderzeugs betätigbare Neigevorrichtung auf, mit der die Gabelzinken der Lastgabel aktiv nach unten oder nach oben geneigt werden können.Larger trucks, such as counterbalanced forklifts, have a tilting device operable by an operator of the truck with which the forks of the forks can be actively tilted downwardly or upwardly.

Bei kleineren Flurförderzeugen, beispielsweise bei mitgängergeführten Hochhubwagen oder bei Fahrerstandhubwagen, ist die Neigung der Lastgabel hingegen meist nicht aktiv einstellbar. Hier tritt, wenn schwere Lasten angehoben werden, der unerwünschte Effekt auf, dass sich die Lastgabel aufgrund einer elastischen Verformung der Lastgabel, des Hubschlittens und des Hubgerüsts nach unten neigt. Um dies zumindest teilweise zu kompensieren, ist es bekannt, die Lastgabel in unbeladenem Zustand leicht nach oben geneigt anzuordnen. Diese Neigung der Lastgabel nach oben erschwert jedoch das Einfahren der unbeladenen Lastgabel in eine Palette oder Gitterbox.In smaller industrial trucks, for example, in pedestrian-controlled stackers or driver's pallet trucks, however, the inclination of the fork is usually not actively adjustable. Here, when heavy loads are lifted, there is an undesirable effect of the load fork tilting down due to elastic deformation of the forklift, the lifting carriage and the mast. To compensate for this at least partially, it is known to arrange the fork in the unloaded state slightly inclined upwards. However, this inclination of the forklift upward makes it difficult to retract the unloaded forklift into a pallet or lattice box.

Aus der US 3 083 853 A ist eine gattungsgemäße Hubanordnung bekannt. Die Hubanordnung umfasst einen in einem Hubgerüst anhebbaren Hubschlitten, dessen unteren Führungsrollen in jeweils einem Exzenter an dem Hubschlitten gelagert sind. Die Exzenter sind jeweils mit einem nach vorne weisenden Hebelarm versehen. Mittels Zapfen sind die Hebelarme der beiden Exzenter an einem zwischen den beiden Exzentern angeordneten Querbügel gelenkig angelenkt. An dem Querbügel sind untere Enden von Druckfedern abgestützt, die mit den oberen Enden an einer Querplatte des Hubschlittens angreifen. Die Druckfedern beaufschlagen den Exzenter mittels eines Hebelarms an einen Anschlag des Hubschlittens. An dem Querbügel sind weiterhin Lastketten angelenkt. Bei einer auf den Lastgabeln befindliche Last wird beim Anhaben des Hubschlittens über die Lastketten der Querbügel entgegen der Kraft der Druckfedern nach oben bewegt, so dass die Exzenter mit den unteren Führungsrollen gedreht und entsprechend die Spitzen der Lastgabeln nach oben abgewinkelt werden.From the US Pat. No. 3,083,853 A is a generic lifting arrangement known. The lifting arrangement comprises a liftable in a mast lifting, the lower guide rollers are mounted in each case an eccentric on the lifting. The eccentrics are each provided with a forward-pointing lever arm. By means of pins, the lever arms of the two eccentrics are articulated to a cross between the two eccentrics arranged crossbar. On the crossbar lower ends are supported by compression springs which engage with the upper ends of a transverse plate of the lifting carriage. The compression springs act on the eccentric by means of a lever arm against a stop of the lifting carriage. At the crossbar load chains are still articulated. In a load on the load forks when lifting the lifting carriage on the load chains of the crossbar is moved against the force of the compression springs up, so that the eccentric rotated with the lower guide rollers and correspondingly the tips of the load forks are angled upwards.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Hubanordnung für ein Flurförderzeug zur Verfügung zu stellen, mit der in einfacher Weise eine unerwünschte Neigung der Lastgabel vermieden wird.The present invention has for its object to provide a lifting arrangement for a truck available, with the undesirable inclination of the fork is avoided in a simple manner.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Federelement einerseits an dem Hubschlitten abgestützt ist und andererseits direkt an dem Exzenter angreift sowie ein Zugmittel des Hubgerüsts an dem Exzenter angreift und an dem Exzenter befestigt ist. Die verstellbare Führungsrolle - oder das verstellbare Führungsrollenpaar - verändert seine Position relativ zum Hubschlitten in Abhängigkeit von dem Gewicht einer auf der Lastgabel befindlichen Last. Dies erfolgt durch eine mechanische Kraftumlenkung. Je größter die Gewichtskraft einer auf der Lastgabel befindlichen Last ist, umso weiter neigt sich der Hubschlitten nach hinten - die Spitzen der Gabelzinken der Lastgabel bewegen sich dadurch nach oben, entgegen der Richtung der elastischen Verformung durch das Lastgewicht. Hierzu ist mindestens eine verstellbare Führungsrolle mittels eines Exzenters an dem Hubschlitten gelagert. Durch Drehen des Exzenters verändert sich die Position der Führungsrolle relativ zum Hubschlitten. Da die Führungsrolle in dem Profil des Hubgerüsts festgelegt ist, wird durch Drehen des Exzenters der Hubschlitten geneigt. Die anderen, nicht verstellbaren Führungsrollen sind in herkömmlicher Weise in dem Profil des Hubgerüsts geführt. Das Federelement gibt bei nicht beladener Lastgabel die Position des Hubschlittens relativ zum Hubgerüst vor. Das Federelement spannt den Hubschlitten in eine Position vor, in der die Zinken der unbeladenen Lastgabel im Wesentlichen waagrecht sind. Das Federelement wirkt dabei zwischen dem Hubschlitten und dem Exzenter, wobei es den Exzenter in einer Endposition hält. Das Federelement greift einerseits an dem Hubschlitten und andererseits an dem Exzenter an. Damit übt das Federelement auf den Exzenter eine Kraft aus und stützt sich dabei an dem Hubschlitten ab. Wenn die Kraft des Federelements versetzt zu einer ersten Exzenterachse in den Exzenter eingeleitet wird, übt das Federelement gleichzeitig ein Drehmoment auf den Exzenter aus. Ein Zugmittel des Hubgerüsts, beispielsweise eine Lastkette, greift an dem Exzenter an. Das Zugmittel nimmt die gesamte Gewichtskraft des Hubschlittens, der Lastgabel und der darauf befindlichen Last auf. Diese Gewichtskräfte werden über den Exzenter an dem Zugmittel abgestützt. Dadurch, dass das Zugmittel nicht direkt an dem Hubschlitten, sondern an dem Exzenter befestigt ist, kann das Zugmittel ein Drehmoment auf den Exzenter ausüben. Dies setzt voraus, dass die Zugkraft des Zugmittels versetzt zur ersten Exzenterachse in den Exzenter eingeleitet wird. Die von dem Zugmittel und von dem Federelement auf den Exzenter ausgeübten Drehmomente wirken einander entgegen. Bevorzugt weist das Hubgerüst zwei Zugmittel auf, wobei an jedem der beiden Exzenter und somit an beiden Führungsrollen des Führungsrollenpaars ein Zugmittel angreift.This object is achieved in that the spring element is supported on the one hand on the lifting carriage and on the other hand acts directly on the eccentric and a traction means of the mast acts on the eccentric and is secured to the eccentric. The adjustable guide roller - or the adjustable guide roller pair - changes its position relative to the lifting depending on from the weight of a load on the fork. This is done by a mechanical force deflection. The greater the weight of a load on the forklift, the more the lift tilts backwards - the tips of the forks of the forks thereby move upward, counter to the direction of elastic deformation by the weight of the load. For this purpose, at least one adjustable guide roller is mounted on the lifting carriage by means of an eccentric. By turning the eccentric, the position of the guide roller changes relative to the lifting carriage. Since the guide roller is fixed in the profile of the mast, the lifting carriage is tilted by turning the eccentric. The other, non-adjustable guide rollers are guided in a conventional manner in the profile of the mast. The spring element indicates the position of the lifting relative to the mast with unloaded fork. The spring element biases the lifting carriage into a position in which the tines of the unloaded load fork are substantially horizontal. The spring element acts between the lifting and the eccentric, wherein it holds the eccentric in an end position. The spring element engages on the one hand on the lifting and on the other hand on the eccentric. Thus, the spring element exerts a force on the eccentric and is supported on the lifting carriage. When the force of the spring element is introduced offset to a first eccentric axis in the eccentric, the spring element simultaneously exerts a torque on the eccentric. A traction means of the mast, for example a load chain, engages the eccentric. The traction means absorbs the entire weight of the lifting carriage, the fork and the load thereon. These weight forces are supported on the traction means via the eccentric. Because the traction means is not fastened directly to the lifting carriage but to the eccentric, the traction means can exert a torque on the eccentric. This requires that the tensile force of the traction means is introduced offset to the first eccentric axis in the eccentric. The torque exerted by the traction means and by the spring element on the eccentric counteract each other. Preferably, the mast has two traction means, wherein a traction means acts on each of the two eccentrics and thus on both guide rollers of the pair of guide rollers.

Der Exzenter ist hierbei gemäß einer vorteilhaften Ausgestaltungsform der Erfindung drehbar um eine erste Exzenterachse an dem Hubschlitten gelagert und die Führungsrolle ist drehbar um eine zweite Exzenterachse an dem Exzenter gelagert, wobei die erste Exzenterachse und die zweite Exzenterachse parallel voneinander beabstandet sind.The eccentric is rotatably mounted in this case according to an advantageous embodiment of the invention about a first eccentric axis on the lifting and the guide roller is rotatably mounted about a second eccentric axis on the eccentric, wherein the first eccentric axis and the second eccentric axis are spaced apart in parallel.

Das Federelement ist derart angeordnet, dass die Gewichtskraft einer auf der Lastgabel befindlichen Last eine elastische Verformung des Federelements bewirkt. Hierbei wird der Exzenter durch die Gewichtskraft entgegen der Kraft des Federelements aus seiner Endposition heraus bewegt.The spring element is arranged such that the weight force of a load located on the load fork causes an elastic deformation of the spring element. Here, the eccentric is moved by the weight against the force of the spring element out of its final position.

Mit besonderem Vorteil ist ein Teil der Oberfläche des Exzenters als Abrollfläche für das Zugmittel ausgebildet. In Abhängigkeit von der Rotationsposition des Exzenters legt sich ein kleinerer oder größerer Abschnitt des Zugmittels an der Abrollfläche an. Die Abrollfläche kann beispielsweise als teilkreisförmige Bahn gebildet sein, deren Mittelachse die erste Exzenterachse ist. Dies stellt sicher, dass der Hebelarm, mit dem die Kraft des Zugmittels auf den Exzenter wirkt, unabhängig von der Rotationsposition des Exzenters stets gleich ist.With particular advantage, a part of the surface of the eccentric is designed as a rolling surface for the traction means. Depending on the rotational position of the eccentric, a smaller or larger section of the traction means engages the rolling surface. The rolling surface can be formed, for example, as a part-circular path, whose central axis is the first eccentric axis. This ensures that the lever arm, with the the force of the traction means acting on the eccentric, regardless of the rotational position of the eccentric is always the same.

Der Exzenter weist einen ersten, vorzugsweise verstellbaren Anschlag auf, der die Position des Exzenters bei unbeladener Lastgabel festlegt. Dieser erste Anschlag kommt bei unbeladener Lastgabel an einem Bauteil des Hubschlittens oder an einem Bauteil der Lastgabel zur Anlage.The eccentric has a first, preferably adjustable stop, which determines the position of the eccentric with unloaded fork. This first stop comes with unloaded fork on a component of the lifting or on a component of the fork to the plant.

Weiter weist der Exzenter einen zweiten, vorzugsweise verstellbaren Anschlag auf, der die Position des Exzenters bei maximal beladener Lastgabel festlegt. Der zweite Anschlag kommt bei maximal beladener Lastgabel an einem Bauteil des Hubschlittens oder an einem Bauteil der Lastgabel zur Anlage.Next, the eccentric on a second, preferably adjustable stop, which determines the position of the eccentric at maximum laden fork. The second stop is at maximum laden fork on a component of the lifting or on a component of the fork to the plant.

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

Figur 1
ein gattungsgemäßes, als Hochhubwagen ausgeführtes Flurförderzeug,
Figur 2
eine erfindungsgemäße Hubanordnung in unbeladenem Zustand,
Figur 3
die obere Führungsrolle im Detail,
Figur 4
die Hubanordnung in beladenem Zustand,
Figur 5
die obere Führungsrolle im Detail.
Further advantages and details of the invention will be explained in more detail with reference to the embodiment shown in the schematic figures. It shows
FIG. 1
a generic, designed as a stacker truck,
FIG. 2
a lifting arrangement according to the invention in the unloaded state,
FIG. 3
the top leadership role in detail,
FIG. 4
the lifting arrangement in loaded condition,
FIG. 5
the top leadership in detail.

Figur 1 zeigt ein gattungsgemäßes, als deichselgeführter Hochhubwagen ausgebildetes Flurförderzeug. Das Flurförderzeug besitzt einen Antriebsteil mit einem lenkbaren Antriebsrad 11. Das Antriebsrad 11 kann durch Schwenken einer Lenkdeichsel 12 um eine vertikale Achse gelenkt werden. Lastseitig besitzt das Flurförderzeug zwei nicht oder nur geringfügig höhenverstellbare Radarme 13 mit jeweils einer Laufrolle 14. FIG. 1 shows a generic, designed as a pedestrian-controlled stacker truck. The truck has a drive part with a steerable drive wheel 11. The drive wheel 11 can be steered by pivoting a steering arm 12 about a vertical axis. On the load side, the truck has two non or only slightly height adjustable wheel arms 13, each with a roller 14th

Ein Hubwerk des Flurförderzeugs umfasst ein nach oben teleskopisch ausfahrbares Hubgerüst 15. Ein Hubschlitten 16 ist mit einem Paar unterer Führungsrollen 17 und einem Paar oberer Führungsrollen 18 in einem Profil des Hubgerüsts 15 geführt. An dem Hubschlitten 16 ist eine Lastgabel 19 befestigt, die gemeinsam mit dem Hubschlitten 16 nach oben und unten bewegt wird. In der dargestellten unteren Endposition der Lastgabel 17 sind die ein U-förmiges Profil aufweisenden Gabelzinken der Lastgabel 17 auf die Radarme 13 abgesenkt und umschließen die Radarme 13 von oben.A hoist of the truck comprises an upwardly telescopically extendable mast 15. A lifting 16 is guided with a pair of lower guide rollers 17 and a pair of upper guide rollers 18 in a profile of the mast 15. On the lifting 16 a fork 19 is attached, which is moved together with the lifting 16 up and down. In the illustrated lower end position of the forks 17 are a U-shaped profile having forks lowered the fork 17 on the wheel arms 13 and enclose the wheel arms 13 from above.

Mit gestrichelten Linien sind der Hubschlitten 16a, die unteren Führungsrollen 17a, die oberen Führungsrollen 18a und die Lastgabel 19a in einer angehobenen Position dargestellt. Rechts neben dem Flurförderzeug ist ein Lagerregal 20 mit zwei darin abgestellten Paletten 21 abgebildet. Zu erkennen ist, wie durch Bewegen des Flurförderzeugs nach in der Zeichnung rechts die Lastgabel 19 in die untere bzw. in die obere Palette eingefahren werden kann. Die Gabelzinken der unbeladenen Lastgabel 19 sind parallel zu der Fahrbahnoberfläche und damit auch parallel zu den Einfahröffnungen der Paletten 21 ausgerichtet. Das Einstellen der Höhe der Lastgabel 19 und das Einfahren der Lastgabel 19 in die Palette ist dadurch besonders einfach.Dashed lines show the lifting carriage 16a, the lower guide rollers 17a, the upper guide rollers 18a and the load fork 19a in a raised position. To the right of the truck, a storage rack 20 is shown with two pallets 21 parked therein. It can be seen how, by moving the truck according to the right in the drawing, the fork 19 can be moved into the lower or in the upper pallet. The forks of the unloaded fork 19 are aligned parallel to the road surface and thus parallel to the entry openings of the pallets 21. Adjusting the height of the fork 19 and the retraction of the fork 19 in the pallet is particularly simple.

Wenn sich auf der Lastgabel 19 eine Last befindet, bewirkt die Gewichtskraft der Last eine elastische Verformung der Bauteile der Hubanordnung, sodass die Lastgabel 19 schräg nach unten geneigt wäre. Eine solche Neigung der beladenen Lastgabel 19 ist unerwünscht und wird mit der in den Figuren 2 bis 5 im Detail dargestellten erfindungsgemäßen Anordnung vermieden.When there is a load on the forklift 19, the weight of the load causes elastic deformation of the components of the lift assembly, such that the forklift 19 would be inclined downwardly. Such a tendency of the loaded fork 19 is undesirable and is in the FIGS. 2 to 5 avoided in detail shown arrangement according to the invention.

Figur 2 zeigt die erfindungsgemäße Hubanordnung in unbeladenem Zustand. Hierbei sind - wie oben erläutert - die Gabelzinken der Lastgabel 19 parallel zur Fahrbahn. Die von den Mittelsachsen der Führungsrollen 17, 18 definierte Ebene ist senkrecht zu den Gabelzinken 19. Hierbei sind die unteren Führungsrollen 17 direkt an dem Hubschlitten 16 gelagert. Die oberen Führungsrollen 18 sind hingegen an einem Exzenter 1 gelagert, welcher wiederum drehbar am Hubschlitten 16 gelagert ist. Ein als Lastkette ausgeführtes Zugmittel 2, das die Gewichtskraft der Lastgabel 19 aufnimmt, greift an dem Exzenter 1 an. FIG. 2 shows the lifting arrangement according to the invention in the unloaded state. Here are - as explained above - the forks of the fork 19 parallel to the road. The plane defined by the center axes of the guide rollers 17, 18 is perpendicular to the fork tines 19. Here, the lower guide rollers 17 are mounted directly on the lifting carriage 16. The upper guide rollers 18, however, are mounted on an eccentric 1, which in turn is rotatably mounted on the lifting carriage 16. A designed as a load chain traction means 2, which receives the weight of the fork 19, engages the eccentric 1 at.

In Figur 3 ist diese Anordnung im Detail dargestellt. Der Exzenter 1 ist an einer ersten Exzenterachse 3 drehbar an dem Hubschlitten 16 gelagert. An einer zweiten Exzenterachse 4 ist die Führungsrolle 18 an dem Exzenter 1 gelagert. Bei unbeladener Lastgabel 19 befinden sich die beiden Exzenterachsen 3, 4 genau übereinander im Abstand D. Diese Lage des Exzenters 1 ist durch einen ersten Anschlag 5 definiert, der an dem Exzenter 1 befestigt ist und an einem Bauteil des Hubschlittens 16 anliegt. In dieser Position wird der Exzenter 1 durch ein Federelement 7 gehalten, welches sich an dem Hubschlitten 16 abstützt und auf den Exzenter 1 ein Drehmoment im Gegenuhrzeigersinn ausübt.In FIG. 3 this arrangement is shown in detail. The eccentric 1 is rotatably mounted on the lifting carriage 16 on a first eccentric axis 3. At a second eccentric axis 4, the guide roller 18 is mounted on the eccentric 1. When unloaded fork 19, the two eccentric axes 3, 4 are exactly above the other at a distance D. This position of the eccentric 1 is defined by a first stop 5, which is fixed to the eccentric 1 and rests against a component of the lifting carriage 16. In this position, the eccentric 1 is held by a spring element 7, which is supported on the lifting carriage 16 and exerts on the eccentric 1 a torque in the counterclockwise direction.

Das Zugmittel 2 greift ebenfalls an dem Exzenter 1 an, ist an einer Abrollfläche des Exzenters 1 umgelenkt und ist dann im Hubgerüst 15 nach oben geführt. Die auf das Zugmittel 2 wirkende Zugkraft, deren Größe vom Gewicht einer auf der Lastgabel 19 befindlichen Last abhängt, übt auf den Exzenter 1 ein Drehmoment im Uhrzeigersinn aus. Bei unbeladener Lastgabel 19 ist das durch das Zugmittel 2 aufgebrachte Drehmoment kleiner als das durch das Federelement 7 aufgebrachte Drehmoment, sodass sich der Exzenter 1 in der durch den Anschlag 5 definierten Endposition befindet.The traction means 2 also acts on the eccentric 1, is deflected on a rolling surface of the eccentric 1 and is then guided in the mast 15 upwards. The force acting on the traction means 2 tensile force, the size of which depends on the weight of a load located on the fork 19, exerts on the eccentric 1 a torque in a clockwise direction. When unloaded fork 19, the torque applied by the traction means 2 is smaller than the torque applied by the spring element 7, so that the eccentric 1 is in the end position defined by the stop 5.

In den Figuren 4 und 5 ist dieselbe Anordnung mit einer auf der Lastgabel 19 befindlichen Last 30 dargestellt. Das von dem Zugmittel 2 auf den Exzenter 1 ausgeübte Drehmoment ist nun so groß, dass der Exzenter 1 entgegen der Kraft des Federelements 7 im Uhrzeigesinn gedreht ist, bis der zweite Anschlag 6 an dem Hubschlitten 16 zur Anlage kommt. Die erste Exzenterachse 3, die den Exzenter 1 mit dem Hubschlitten 16 verbindet, ist nun relativ zur zweiten Exzenterachse 4 nach in der Zeichnung links versetzt. Der Hubschlitten 16 und die Lastgabel 19 werden hierdurch insgesamt im Gegenuhrzeigersinn geschwenkt, sodass die Spitzen der Gabelzinken nach oben versetzt sind. Die beladene Lastgabel 19 wird also nach hinten geneigt. Damit wird die elastische Verformung der Hubanordnung aufgrund der Gewichtskraft der Last 30 ausgeglichen und sogar geringfügig überkompensiert.In the FIGS. 4 and 5 the same arrangement is shown with a load located on the fork 19 load 30. The force exerted by the traction means 2 on the eccentric 1 torque is now so large that the eccentric 1 is rotated counter to the force of the spring element 7 in the clockwise direction until the second stopper 6 comes to rest on the lifting 16. The first eccentric axis 3, which connects the eccentric 1 with the lifting slide 16, is now offset to the left in the drawing relative to the second eccentric axis 4. The lifting 16 and the fork 19 are hereby pivoted in total counterclockwise, so that the tips of the forks are offset upwards. The loaded fork 19 is therefore tilted backwards. Thus, the elastic deformation of the lifting assembly is balanced due to the weight of the load 30 and even slightly overcompensated.

Die in den Figuren 3 und 5 dargestellte Anordnung mit Exzenter 1, Federelement 7 und Zugmittel 2 ist bei jeder der beiden oberen Führungsrollen 18 vorhanden.The in the FIGS. 3 and 5 shown arrangement with eccentric 1, spring element 7 and traction means 2 is present in each of the two upper guide rollers 18.

Die Auslenkung des Exzenters 1 ist abhängig von der Gewichtskraft der auf der Lastgabel 19 befindlichen Last. Bei mittelschwerer Last stellt sich die Lage des Exzenters 1 auf eine Position zwischen den durch die Anschläge 5, 6 definierten Endpositionen ein. Die Anschläge 5, 6 sind einstellbar, sodass die Horizontalposition und die maximale Neigung der Lastgabel 19 bei der Montage der Hubanordnung justiert werden können.The deflection of the eccentric 1 is dependent on the weight of the load located on the fork 19 load. In the case of moderate load, the position of the eccentric 1 adjusts to a position between the end positions defined by the stops 5, 6. The stops 5, 6 are adjustable, so that the horizontal position and the maximum inclination of the fork 19 can be adjusted during assembly of the lifting arrangement.

Claims (8)

  1. Lifting arrangement for an industrial truck having a lifting carriage (16) which is guided such that it can be moved up and down along a lifting frame (15) by means of guide rollers (17, 18), to which lifting carriage (16) a load fork (19) is fastened which is oriented substantially parallel to a roadway surface in the unloaded state and which can be deformed elastically by the weight of a received load (30), at least one guide roller (18) being mounted adjustably on the lifting carriage (16) in such a way that the position of the lifting carriage (16) can be changed automatically relative to the lifting frame (15) on account of the weight of a received load (30), with the result that an elastic deformation of the load fork (19) can be compensated at least partially or can be over-compensated, the at least one adjustable guide roller (18) being mounted on the lifting carriage (16) by means of an eccentric (1), and a spring element (7) being provided which defines the position of the lifting carriage (16) relative to the lifting frame (15) in the case of a non-loaded load fork (19), characterized in that the spring element (7) is supported on one side on the lifting carriage (16) and acts directly on the eccentric (1) on the other side, and a drive means (2) of the lifting frame (15) acts on the eccentric (1) and is fastened to the eccentric (1).
  2. Lifting arrangement according to Claim 1, characterized in that the eccentric (1) is mounted on the lifting carriage (16) such that it can be rotated about a first eccentric axis (3), and the guide roller (18) is mounted on the eccentric (1) such that it can be rotated about a second eccentric axis (4), the first eccentric axis (3) and the second eccentric axis (4) being spaced apart from one another in parallel.
  3. Lifting arrangement according to Claim 1 or 2, characterized in that the spring element (7) is arranged in such a way that the weight of a load (30) which is situated on the load fork (19) brings about an elastic deformation of the spring element (7).
  4. Lifting arrangement according to one of Claims 1 to 3, characterized in that a part of the surface of the eccentric (1) is configured as a rolling face for the drive means (2).
  5. Lifting arrangement according to one of Claims 1 to 4, characterized in that the eccentric (1) has a first, preferably adjustable stop (5) which fixes the position of the eccentric (1) in the case of a non-loaded load fork (19).
  6. Lifting arrangement according to Claim 5, characterized in that the first stop (5) comes into contact with a component of the lifting carriage (16) or with a component of the load fork (19) in the case of a non-loaded load fork (19).
  7. Lifting arrangement according to one of Claims 1 to 6, characterized in that the eccentric (1) has a second, preferably adjustable stop (6) which fixes the position of the eccentric (1) in a case of a load fork (19) with a maximum loading.
  8. Lifting arrangement according to Claim 7, characterized in that the second stop (6) comes into contact with a component of the lifting carriage (16) or with a component of the load fork (19) in the case of a load fork (19) with a maximum loading.
EP20090005663 2008-05-30 2009-04-22 Lifting assembly for an industrial truck Not-in-force EP2128076B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810026130 DE102008026130A1 (en) 2008-05-30 2008-05-30 Lifting arrangement for an industrial truck

Publications (2)

Publication Number Publication Date
EP2128076A1 EP2128076A1 (en) 2009-12-02
EP2128076B1 true EP2128076B1 (en) 2014-05-07

Family

ID=41020850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090005663 Not-in-force EP2128076B1 (en) 2008-05-30 2009-04-22 Lifting assembly for an industrial truck

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EP (1) EP2128076B1 (en)
DE (1) DE102008026130A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083853A (en) 1960-06-06 1963-04-02 Clark Equipment Co Load engaging apparatus for lift trucks
DE3840748A1 (en) * 1988-12-03 1990-06-07 Dickertmann Ag DEVICE FOR ADJUSTING LOAD-TAKING FORK Tines IN A SLOPE UPWARD POSITION
DE19525723A1 (en) * 1995-07-14 1997-01-16 Linde Ag Industrial truck with a mast

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Publication number Publication date
EP2128076A1 (en) 2009-12-02
DE102008026130A1 (en) 2009-12-03

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