EP1516851B1 - Extendable mastconstruction for a lifting truck - Google Patents

Extendable mastconstruction for a lifting truck Download PDF

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Publication number
EP1516851B1
EP1516851B1 EP04020710A EP04020710A EP1516851B1 EP 1516851 B1 EP1516851 B1 EP 1516851B1 EP 04020710 A EP04020710 A EP 04020710A EP 04020710 A EP04020710 A EP 04020710A EP 1516851 B1 EP1516851 B1 EP 1516851B1
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EP
European Patent Office
Prior art keywords
mast
sleeve
cross member
extendable
lift
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EP04020710A
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German (de)
French (fr)
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EP1516851A1 (en
Inventor
Alexander Hofmann
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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

Definitions

  • the invention relates to an extendable mast construction for a lift truck according to the preamble of patent claim 1 or 6.
  • Such mast constructions are about DE 197 10 556 C2 known. They have an outer mast, which is mounted on the truck, possibly tiltable.
  • the outer mast has two spaced columns, which are interconnected by a lower and an upper crossbar.
  • An inner mast has spaced columns, which are guided on the columns of the outer mast and which are connected to one another at the upper and lower ends via a cross member or a traverse.
  • At the bottom of a cross member is usually mounted on which the so-called free-lift cylinder is supported, which actuates the load supporting means, which is guided vertically movable on the inner mast.
  • On the outer mast are supported two mast lifting cylinders whose piston rods can be connected to the upper cross member.
  • the mast lifting cylinders move linearly. It must be ensured that the cross member is always arranged horizontally in this adjustment. In addition, there must be no slack in the attachment between the piston rods and the cross member. Tolerances can not be avoided when manufacturing the mast lifting cylinders and when mounting the lifting structure. It may happen that with respect to the stroke of the two mast lifting with respect to the cross member differences of several millimeters occur, which can not be accepted. It is therefore known to make a corresponding adjustment in the prefabrication of mast parts and in the final assembly. Previously, this was used washers, which were used in the attachment of the piston rods to the cross member. A disadvantage of the known construction, that further adjustments can be made only by loosening the piston rods from the cross member. This is time consuming, especially since a double adjustment is required, namely during assembly of the mast and during assembly of the mast on the vehicle.
  • the invention has for its object to provide an extendable mast construction for a mast of an industrial truck, in which the adjustment of mast lifting and inner mast is simplified.
  • an adjusting member having an external thread is fixed to the upper end of the piston rod of one of the two mast lifting cylinders, and a socket having an internal thread is screwed onto the external thread of the adjusting member.
  • the bush has support surfaces for the cross member.
  • the adjusting member may be formed by a sleeve which can be fixed by means of a bolt at the end of the piston rod.
  • the bushing has clamping means for locking the bushing on the bushing after adjustment has taken place.
  • the clamping means may be, for example, that the socket is split and a clamping screw is provided to tighten the separate sections against each other and thus fix the socket on the setting member.
  • the cross member on bearing portions, which are supported on the piston rod and the socket.
  • the one Bearing portion is hollow and approximately fitting on the upper portion of the socket attachable.
  • the bush has at the end of the upper portion radial shoulder surfaces on which the bearing portion is supported.
  • both mast lifting cylinders are extended to the stop.
  • One of the mast lifting cylinders serves as a reference, and by adjusting the bush by turning it on the sleeve, the stroke of the second mast lifting cylinder is set equal to that of the first cylinder. Then the socket is clamped. It is understood that this adjustment procedure can also be made up or repeated at any time, without this requiring a special effort. Rather, only the clamping of the socket is to lift and this to turn so far that the strokes of both mast lifting are the same size.
  • a number of advantages are associated with the invention. It can make an exact stroke adjustment of the mounted mast, both on the test bench and in the vehicle. The time required for this is very small. This reduces the time required for mast and vehicle assembly.
  • the invention also has the advantage that manufacturing tolerances, especially in lifting cylinders, can be made coarser. The funds that are used for this purpose are very simple and manufacture and assembly require little effort.
  • stroke adjustment is provided by a suitable connection between the piston rod of a mast lift cylinder and the cross member. It is understood that such a setting can also be installed between the cylinder housing and the lower cross member of the outer mast, as indicated in claim 6.
  • Fig. 1 shows in perspective a mast construction according to the invention.
  • FIG. 2 shows enlarged part of the mast construction after Fig. 1 ,
  • Fig. 3 shows a top view of the mast construction Fig. 1 ,
  • Fig. 4 shows a section through the illustration Fig. 3 along the line 4-4.
  • Fig. 5 shows a section through the illustration Fig. 3 along the line 5-5.
  • a mast construction is generally designated 10. It has an outer mast 12 having two spaced columns 14, 16 which are interconnected by a lower cross member 18 and an upper cross member 20.
  • An inner mast 30 guided on the outer mast 12 has an upper and a lower cross member 36, 35.
  • a free-lifting cylinder 22 is supported, which raises or lowers a fork 26 via a chain, not shown, and a chain roller 24 on the piston rod.
  • the fork 26 is guided in a manner not shown with the aid of a so-called fork back 28 on the inner mast 30, the spaced columns 32, 34 which are connected at the upper end by the cross member 36.
  • bearing portions 44, 46 are attached to the underside of the cross member.
  • the bearing portions 46 is fastened by means of a bolt 48 at the upper end of the associated piston rod 50.
  • the piston rod has an internally threaded bore, and the passage 52 through the bearing portion 46 has a constriction as an abutment for the head of the bolt.
  • the end of the piston rod 46 has a pin 54 which engages in the passage 52.
  • the lower surface of the bearing portion 46 is fully supported on the facing end surface of the piston rod 50.
  • the piston rod 56 of the other mast lifting cylinder 40 (see Fig. 1 ) has the same final shape as the piston rod 50.
  • a sleeve 58 is fastened by means of a screw bolt 60 on the end of the piston rod 46.
  • the sleeve has a constriction as an abutment for the head of the bolt 60.
  • the sleeve 58 has an external thread on which a socket 62 is screwed.
  • the sleeve 62 whose outer contour may be rectangular, for example, has an upper portion 64 and a lower portion 66. Between the sections 64, 66 shoulder surfaces 68 are formed.
  • the bearing portion 44 has a passage 70 which fits snugly onto the upper portion 64 of the bushing 62 with its end resting on the shoulder surfaces 68.
  • the socket 62 is also in Fig. 2 indicated. It can be seen that it is split and receives a clamping screw, as indicated at 72. As a result, it can be clamped firmly on the sleeve 58.

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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)
  • Forklifts And Lifting Vehicles (AREA)

Description

Die Erfindung bezieht sich auf eine ausfahrbare Mastkonstruktion für einen Hubwagen nach dem Oberbegriff des Patentanspruchs 1 oder 6.The invention relates to an extendable mast construction for a lift truck according to the preamble of patent claim 1 or 6.

Derartige Mastkonstruktionen sind etwa aus DE 197 10 556 C2 bekannt geworden. Sie weisen einen Außenmast auf, der am Flurförderzeug angebracht ist, gegebenenfalls kippbar. Der Außenmast weist zwei beabstandete Säulen auf, welche durch eine untere und eine obere Traverse miteinander verbunden sind. Ein Innenmast weist beabstandete Säulen auf, die an den Säulen des Außenmastes geführt sind und die am oberen und unteren Ende über einen Querträger oder eine Traverse miteinander verbunden sind. Am unteren Ende ist zumeist auch ein Querträger angebracht, auf dem sich der sogenannte Freihubzylinder abstützt, der das Lasttragmittel betätigt, das höhenbeweglich am Innenmast geführt ist. Am Außenmast stützen sich zwei Masthubzylinder ab, deren Kolbenstangen mit dem oberen Querträger verbindbar sind.Such mast constructions are about DE 197 10 556 C2 known. They have an outer mast, which is mounted on the truck, possibly tiltable. The outer mast has two spaced columns, which are interconnected by a lower and an upper crossbar. An inner mast has spaced columns, which are guided on the columns of the outer mast and which are connected to one another at the upper and lower ends via a cross member or a traverse. At the bottom of a cross member is usually mounted on which the so-called free-lift cylinder is supported, which actuates the load supporting means, which is guided vertically movable on the inner mast. On the outer mast are supported two mast lifting cylinders whose piston rods can be connected to the upper cross member.

Die Masthubzylinder bewegen sich naturgemäß linear. Dabei ist sicherzustellen, daß bei dieser Verstellung der Querträger stets waagerecht angeordnet ist. Außerdem darf in der Anbringung zwischen den Kolbenstangen und dem Querträger keine Lose vorhanden sein. Bei der Herstellung der Masthubzylinder und bei der Montage der Hubkonstruktion lassen sich Toleranzen nicht vermeiden. So kann geschehen, daß bezüglich des Hubes der beiden Masthubzylinder in Hinblick auf den Querträger Differenzen von mehreren Millimetern auftreten, die jedoch nicht hingenommen werden können. Es ist daher bekannt, beim Vorfertigen von Mastteilen und bei der endgültigen Montage eine entsprechende Justierung vorzunehmen. Bisher wurden hierfür Unterlegscheiben verwendet, die bei der befestigung der Kolbenstangen an dem Querträger eingesetzt wurden. Nachteilig bei der bekannten Konstruktion ist, daß weitere Einstellarbeiten nur durch Lösen der Kolbenstangen vom Querträger erfolgen können. Dies ist zeitaufwendig, zumal eine doppelte Einstellung erforderlich ist, und zwar bei der Montage des Hubgerüstes und bei der Montage des Hubgerüstes am Fahrzeug.Naturally, the mast lifting cylinders move linearly. It must be ensured that the cross member is always arranged horizontally in this adjustment. In addition, there must be no slack in the attachment between the piston rods and the cross member. Tolerances can not be avoided when manufacturing the mast lifting cylinders and when mounting the lifting structure. It may happen that with respect to the stroke of the two mast lifting with respect to the cross member differences of several millimeters occur, which can not be accepted. It is therefore known to make a corresponding adjustment in the prefabrication of mast parts and in the final assembly. Previously, this was used washers, which were used in the attachment of the piston rods to the cross member. A disadvantage of the known construction, that further adjustments can be made only by loosening the piston rods from the cross member. This is time consuming, especially since a double adjustment is required, namely during assembly of the mast and during assembly of the mast on the vehicle.

Der Erfindung liegt die Aufgabe zugrunde, eine ausfahrbare Mastkonstruktion für ein Hubgerüst eines Flurförderzeuges zu schaffen, bei dem das Justieren von Masthubzylinder und Innenmast vereinfacht ist.The invention has for its object to provide an extendable mast construction for a mast of an industrial truck, in which the adjustment of mast lifting and inner mast is simplified.

Diese Aufgabe wird durch die Merkmale der Ansprüche 1 und 6 gelöst.This object is solved by the features of claims 1 and 6.

Bei der Lösung nach Patentanspruch 1 wird ein ein Außengewinde aufweisendes Einstellbauteil am oberen Ende der Kolbenstange eines der beiden Masthubzylinder befestigt, und eine ein Innengewinde aufweisende Buchse wird auf das Außengewinde des Einstellbauteils geschraubt. Die Buchse weist Abstützflächen für den Querträger auf. Nach einer Ausgestaltung der Erfindung kann das Einstellbauteil von einer Hülse gebildet werden, welche mit Hilfe eines Schraubenbolzens am Ende der Kolbenstange befestigt werden kann.In the solution according to claim 1, an adjusting member having an external thread is fixed to the upper end of the piston rod of one of the two mast lifting cylinders, and a socket having an internal thread is screwed onto the external thread of the adjusting member. The bush has support surfaces for the cross member. According to one embodiment of the invention, the adjusting member may be formed by a sleeve which can be fixed by means of a bolt at the end of the piston rod.

Nach der Erfindung weist die Buchse Klemmmittel zum Festsetzen der Buchse auf der Hülse auf, nachdem eine Einstellung erfolgt ist. Die Klemmmittel können zum Beispiel darin bestehen, daß die Buchse geteilt ist und eine Klemmschraube vorgesehen ist, um die getrennten Abschnitte gegeneinander festzuziehen und somit die Buchse auf dem Einstellbauteil festzulegen.According to the invention, the bushing has clamping means for locking the bushing on the bushing after adjustment has taken place. The clamping means may be, for example, that the socket is split and a clamping screw is provided to tighten the separate sections against each other and thus fix the socket on the setting member.

Nach einer anderen Ausgestaltung der Erfindung weist der Querträger Lagerabschnitte auf, die sich an der Kolbenstange bzw. der Buchse abstützen. Der eine Lagerabschnitt ist hohl und annähernd passend auf den oberen Abschnitt der Buchse aufsteckbar. Die Buchse weist am Ende des oberen Abschnittes radiale Schulterflächen auf, auf denen sich der Lagerabschnitt abstützt.According to another embodiment of the invention, the cross member on bearing portions, which are supported on the piston rod and the socket. The one Bearing portion is hollow and approximately fitting on the upper portion of the socket attachable. The bush has at the end of the upper portion radial shoulder surfaces on which the bearing portion is supported.

Bei der Hubeinstellung werden zum Beispiel beide Masthubzylinder bis zum Anschlag ausgefahren. Der eine Masthubzylinder dient als Referenz, und durch Verstellen der Buchse, in dem diese auf der Hülse verdreht wird, wird der Hub des zweiten Masthubzylinders gleich dem des ersten Zylinders eingestellt. Anschließend wird die Buchse festgeklemmt. Es versteht sich, daß diese Einstellprozedur auch jederzeit nachgeholt oder wiederholt werden kann, ohne daß es hierzu eines besonderen Aufwandes bedarf. Vielmehr ist lediglich die Klemmung der Buchse aufzuheben und diese soweit zu verdrehen, daß die Hübe beider Masthubzylinder gleich groß sind.For stroke adjustment, for example, both mast lifting cylinders are extended to the stop. One of the mast lifting cylinders serves as a reference, and by adjusting the bush by turning it on the sleeve, the stroke of the second mast lifting cylinder is set equal to that of the first cylinder. Then the socket is clamped. It is understood that this adjustment procedure can also be made up or repeated at any time, without this requiring a special effort. Rather, only the clamping of the socket is to lift and this to turn so far that the strokes of both mast lifting are the same size.

Mit der Erfindung ist eine Reihe von Vorteilen verbunden. Es läßt sich eine exakte Hubeinstellung des montierten Hubgerüstes vornehmen, und zwar sowohl am Prüfstand als auch im Fahrzeug. Die hierfür erforderliche Zeit ist sehr gering. Dadurch wird der Zeitaufwand für die Hubgerüst- und Fahrzeugmontage reduziert. Die Erfindung hat auch den Vorteil, daß Fertigungstoleranzen, insbesondere bei Hubzylindern, gröber gestaltet werden können. Die Mittel, die hierfür eingesetzt werden, sind denkbar einfach und Herstellung und Montage erfordern nur einen geringen Aufwand.A number of advantages are associated with the invention. It can make an exact stroke adjustment of the mounted mast, both on the test bench and in the vehicle. The time required for this is very small. This reduces the time required for mast and vehicle assembly. The invention also has the advantage that manufacturing tolerances, especially in lifting cylinders, can be made coarser. The funds that are used for this purpose are very simple and manufacture and assembly require little effort.

In der obigen Beschreibung wird eine Hubeinstellung durch eine geeignete Verbindung zwischen der Kolbenstange eines Masthubzylinders und dem Querträger vorgesehen. Es versteht sich, daß eine derartige Einstellung auch zwischen dem Zylindergehäuse und der unteren Traverse des Außenmastes eingebaut werden kann, wie dies in Patentanspruch 6 angegeben ist.In the above description, stroke adjustment is provided by a suitable connection between the piston rod of a mast lift cylinder and the cross member. It is understood that such a setting can also be installed between the cylinder housing and the lower cross member of the outer mast, as indicated in claim 6.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.The invention will be explained in more detail with reference to drawings.

Fig. 1 zeigt perspektivisch eine Mastkonstruktion nach der Erfindung. Fig. 1 shows in perspective a mast construction according to the invention.

Fig. 2 zeigt vergrößert einen Teil der Mastkonstruktion nach Fig. 1. Fig. 2 shows enlarged part of the mast construction after Fig. 1 ,

Fig. 3 zeigt eine Draufsicht auf die Mastkonstruktion nach Fig. 1. Fig. 3 shows a top view of the mast construction Fig. 1 ,

Fig. 4 zeigt einen Schnitt durch die Darstellung nach Fig. 3 entlang der Linie 4-4. Fig. 4 shows a section through the illustration Fig. 3 along the line 4-4.

Fig. 5 zeigt einen Schnitt durch die Darstellung nach Fig. 3 entlang der Linie 5-5. Fig. 5 shows a section through the illustration Fig. 3 along the line 5-5.

In Fig. 1 ist eine Mastkonstruktion insgesamt mit 10 bezeichnet. Sie weist einen Außenmast 12 auf, der zwei beabstandete Säulen 14, 16 aufweist, die durch eine untere Traverse 18 und eine obere Traverse 20 miteinander verbunden sind. Ein am Außenmast 12 innen geführter Innenmast 30 weist einen oberen und einen unteren Querträger 36, 35 auf. Auf dem unteren Querträger 35 stützt sich ein Freihubzylinder 22 ab, der über eine nicht gezeigte Kette und eine Kettenrolle 24 an der Kolbenstange eine Gabel 26 anhebt oder absenkt. Die Gabel 26 ist auf nicht weiter dargestellte Art und Weise mit Hilfe eines sogenannten Gabelrückens 28 am Innenmast 30 geführt, der beabstandete Säulen 32, 34 aufweist, die am oberen Ende durch den Querträger 36 verbunden sind.In Fig. 1 a mast construction is generally designated 10. It has an outer mast 12 having two spaced columns 14, 16 which are interconnected by a lower cross member 18 and an upper cross member 20. An inner mast 30 guided on the outer mast 12 has an upper and a lower cross member 36, 35. On the lower cross member 35, a free-lifting cylinder 22 is supported, which raises or lowers a fork 26 via a chain, not shown, and a chain roller 24 on the piston rod. The fork 26 is guided in a manner not shown with the aid of a so-called fork back 28 on the inner mast 30, the spaced columns 32, 34 which are connected at the upper end by the cross member 36.

Auf der unteren Traverse 18 stützen sich Masthubzylinder 40, 41 ab. Ihre Kolbenstangen sind mit dem oberen Querträger 36 verbunden, wie das anhand weiterer Figuren noch näher erläutert werden soll.On the lower cross member 18 mast cylinders 40, 41 are based. Your piston rods are connected to the upper cross member 36, as will be explained in more detail with reference to other figures.

Wie aus Fig. 1 und 2 zu erkennen, sind an der Unterseite des Querträgers 36 Lagerabschnitte 44, 46 angebracht. In den Fig. 4 und 5 sind die Lagerabschnitte 44, 46 deutlicher zu erkennen. Der Lagerabschnitte 46 wird mit Hilfe eines Schraubenbolzens 48 am oberen Ende der zugehörigen Kolbenstange 50 befestigt. Zu diesem Zweck hat die Kolbenstange eine Innengewindebohrung, und der Durchgang 52 durch den Lagerabschnitt 46 weist eine Verengung auf als Widerlager für den Kopf des Schraubenbolzens. Das Ende der Kolbenstange 46 weist einen Zapfen 54 auf, der in den Durchgang 52 eingreift. Die untere Fläche des Lagerabschnitts 46 stützt sich satt an der zugekehrten Endfläche der Kolbenstange 50 ab.How out Fig. 1 and 2 can be seen, 36 bearing portions 44, 46 are attached to the underside of the cross member. In the 4 and 5 the bearing sections 44, 46 can be seen more clearly. The bearing portions 46 is fastened by means of a bolt 48 at the upper end of the associated piston rod 50. For this purpose, the piston rod has an internally threaded bore, and the passage 52 through the bearing portion 46 has a constriction as an abutment for the head of the bolt. The end of the piston rod 46 has a pin 54 which engages in the passage 52. The lower surface of the bearing portion 46 is fully supported on the facing end surface of the piston rod 50.

Die Kolbenstange 56 des anderen Masthubzylinders 40 (siehe Fig. 1) weist die gleiche Endform wie die Kolbenstange 50 auf. In Fig. 4 ist jedoch zu erkennen, daß eine Hülse 58 mit Hilfe eines Schraubenbolzens 60 auf dem Ende der Kolbenstange 46 befestigt ist. Die Hülse weist eine Verengung auf als Widerlager für den Kopf des Schraubenbolzens 60. Die Hülse 58 weist ein Außengewinde auf, auf das eine Buchse 62 geschraubt ist. Die Buchse 62, deren Außenkontur zum Beispiel rechteckig sein kann, weist einen oberen Abschnitt 64 und einen unteren Abschnitt 66 auf. Zwischen den Abschnitten 64, 66 sind Schulterflächen 68 geformt. Der Lagerabschnitt 44 weist einen Durchgang 70 auf, der passend auf den oberen Abschnitt 64 der Buchse 62 aufgesteckt werden kann, wobei sein Ende sich auf den Schulterflächen 68 abstützt.The piston rod 56 of the other mast lifting cylinder 40 (see Fig. 1 ) has the same final shape as the piston rod 50. In Fig. 4 However, it can be seen that a sleeve 58 is fastened by means of a screw bolt 60 on the end of the piston rod 46. The sleeve has a constriction as an abutment for the head of the bolt 60. The sleeve 58 has an external thread on which a socket 62 is screwed. The sleeve 62, whose outer contour may be rectangular, for example, has an upper portion 64 and a lower portion 66. Between the sections 64, 66 shoulder surfaces 68 are formed. The bearing portion 44 has a passage 70 which fits snugly onto the upper portion 64 of the bushing 62 with its end resting on the shoulder surfaces 68.

Die Buchse 62 ist auch in Fig. 2 angedeutet. Man erkennt, daß sie geteilt ist und eine Klemmschraube aufnimmt, wie bei 72 angedeutet. Dadurch kann sie fest auf die Hülse 58 geklemmt werden.The socket 62 is also in Fig. 2 indicated. It can be seen that it is split and receives a clamping screw, as indicated at 72. As a result, it can be clamped firmly on the sleeve 58.

Bei der Montage wird die Verbindung des Querträgers 36 mit der Kolbenstange 50 des Masthubzylinders 52 in der in Fig. 5 gezeigten und oben beschriebenen Art und Weise vorgenommen. Da aufgrund von Fertigungstoleranzen der Masthubzylinder 40, 42 und anderer Mastteile der Hub beider Masthubzylinder 40, 42 nicht völlig gleich sein wird, muß eine entsprechende Justierung vorgenommen werden. Dies geschieht mit Hilfe der Buchse 62, die soweit in der einen oder anderen Richtung auf der Hülse 58 verdreht wird, bis die gewünschte Hubeinstellung erreicht ist. Zum Beispiel werden die Masthubzylinder 40, 42 in die Endstellung gefahren, wonach dann die beschriebene Hubeinstellung stattfindet. Ist diese erfolgt, wird durch Festziehen der Klemmschraube 72 die Buchse 62 festgeklemmt. Eine erneute Justierung ist auf einfache Weise möglich, indem die Klemmschraube 72 gelöst und die Buchse 62 um das gewünschte Maß verdreht wird.During assembly, the connection of the cross member 36 with the piston rod 50 of the Masthubzylinders 52 in the in Fig. 5 shown and described above and Made way. Since, due to manufacturing tolerances of the mast stroke cylinder 40, 42 and other mast parts of the stroke of both mast lifting 40, 42 will not be completely the same, a corresponding adjustment must be made. This is done with the help of the sleeve 62, which is rotated so far in one or the other direction on the sleeve 58 until the desired stroke adjustment is reached. For example, the mast lifting cylinders 40, 42 are moved into the end position, after which the stroke adjustment described takes place. If this is done, the sleeve 62 is clamped by tightening the clamping screw 72. Re-adjustment is easily possible by the clamping screw 72 is released and the sleeve 62 is rotated by the desired amount.

Claims (4)

  1. Extendable mast construction for a lift truck, with
    • an outer mast fixed to the wagon, whose spaced-apart pillars are connected by an upper and a lower crosshead,
    • an extendable inner mast, which is guided by the outer mast and on which a load support device is guided so as to be movable up and down, and whose pillars are connected by an upper and a lower cross member or crosshead,
    • one mast lift cylinder for each pillar of the inner mast, the cylinders staying on the outer mast and their piston rods being connectible to the cross member, and
    • adjustment means between the piston rods and the cross member for the lift compensation,
    characterised in that
    • an adjustment component having a male thread is fastened to the upper end of the piston rod (56) of one of the two mast lift cylinders (40, 42), and a sleeve (62) with a female thread is screwed onto the male thread of the adjustment component and it has support faces for the cross member (36);
    • the adjustment component is a bushing (58) and adapted to be fastened on the piston rod (56) with the aid of a screw bolt (60),
    • the sleeve (62) has clamping means for immobilisation of the sleeve on the bushing (58), and the sleeve (62) has an upper portion (64) and a lower portion (66), between which shoulder faces (68) are formed, wherein a support portion (44) provided with a passage of the cross member (36) stays on the shoulder faces (68).
  2. Extendable mast construction according to claim 1, characterised in that the sleeve (62) is divided and a clamping screw (72) is provided for tightening the sleeve (62) on the bushing (58).
  3. Extendable mast construction according to any one of claims 1 to 4, characterised in that the cross member (36) is supported on the piston rods or sleeves, respectively, via support portions (44, 46), and that one support portion (44) is hollow and can be put up onto the upper portion (64) of the sleeve (62) in an approximately matching manner, and the sleeve (62) has radial shoulder faces (68) at the end of its upper portion, on which the support portion (44) stays.
  4. Extendable mast construction for a lift truck, with
    • an outer mast fixed to the wagon, whose spaced-apart pillars are connected by an upper and a lower crosshead,
    • an extendable inner mast, which is guided by the outer mast and on which a load support device is guided so as to be movable up and down, and whose pillars are connected by an upper and a lower cross member or cross carrier
    • one mast lift cylinder for each pillar of the inner mast, the cylinders staying on the outer mast and their piston rods being connectible to the cross member,
    • adjustment means between the mast lift cylinders and the outer mast,
    characterised in that
    • an adjustment component having a male thread is attached to the lower end of one of the mast lift cylinders, and a sleeve with a female thread is screwed onto the male thread and stays on the lower crosshead of the outer mast.
EP04020710A 2003-09-19 2004-09-01 Extendable mastconstruction for a lifting truck Active EP1516851B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343312 2003-09-19
DE10343312A DE10343312B4 (en) 2003-09-19 2003-09-19 Retractable mast construction for a pallet truck

Publications (2)

Publication Number Publication Date
EP1516851A1 EP1516851A1 (en) 2005-03-23
EP1516851B1 true EP1516851B1 (en) 2012-07-18

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US (2) US7188709B2 (en)
EP (1) EP1516851B1 (en)
CN (1) CN100364878C (en)
DE (1) DE10343312B4 (en)

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DE10343312B4 (en) 2005-12-01
EP1516851A1 (en) 2005-03-23
US20070114097A1 (en) 2007-05-24
CN1597495A (en) 2005-03-23
US8646578B2 (en) 2014-02-11
DE10343312A1 (en) 2005-04-14
US20050087396A1 (en) 2005-04-28
US7188709B2 (en) 2007-03-13
CN100364878C (en) 2008-01-30

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