GB2449543A - Industrial truck lifting frame allowing viewing with cylinder and traction mechanism. - Google Patents

Industrial truck lifting frame allowing viewing with cylinder and traction mechanism. Download PDF

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Publication number
GB2449543A
GB2449543A GB0809095A GB0809095A GB2449543A GB 2449543 A GB2449543 A GB 2449543A GB 0809095 A GB0809095 A GB 0809095A GB 0809095 A GB0809095 A GB 0809095A GB 2449543 A GB2449543 A GB 2449543A
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GB
United Kingdom
Prior art keywords
lifting
mast
lifting cylinder
deflection roller
cylinder
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Granted
Application number
GB0809095A
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GB2449543B (en
GB0809095D0 (en
Inventor
Barry Michael Warner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Material Handling UK Ltd
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Linde Material Handling UK Ltd
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Publication date
Priority claimed from DE102008018032.7A external-priority patent/DE102008018032B4/en
Application filed by Linde Material Handling UK Ltd filed Critical Linde Material Handling UK Ltd
Publication of GB0809095D0 publication Critical patent/GB0809095D0/en
Publication of GB2449543A publication Critical patent/GB2449543A/en
Application granted granted Critical
Publication of GB2449543B publication Critical patent/GB2449543B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains

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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)

Abstract

A lifting frame (1) for an industrial truck has a fixed mast (2) that carries a travelling mast (3). A lifting carriage (4) is guided vertically on the travelling mast. A cylinder (5) is arranged on the fixed mast and connected to the carriage by a traction mechanism (7). The lifting cylinder can raise the travelling mast and at the end of the piston rod is a deflection roller (6) for the traction mechanism. The traction mechanism is connected to the fixed mast and guided, via the deflection roller, to a first deflection roller (9) arranged in a lower region of the travelling mast, being guided from the first deflection roller to a second deflection roller (10) arranged in an upper region of the travelling mast and guided from the second deflection roller to the lifting carriage and fixed thereto.

Description

* LIFTING FRAME FOR AN INDUSTRIAL TRUCK The invention relates to a
lifting frame for an industrial truck having a stationary mast which cannot be raised and an extending mast, which can be raised in relation to the stationary mast, a lifting carriage being guided such that it can move in the vertical direction on the extending mast.
Lifting frames of the mentioned type are used in industrial trucks, such as fork-lift trucks, reach trucks or reach fork-lift trucks, for example. In this case the lifting carriage is used for picking up and raising loads. In order to raise the lifting carriage in the extending mast, a lifting cylinder, a so-called free-lift cylinder, is generally provided, which is arranged on the extending mast which can be raised and is connected to the lifting carriage by means of a lift chain and deflection rollers. In order to raise the extending mast in relation to the stationary mast, at least one lifting cylinder is generally provided which, in the case of a lifting frame in the form of a so-called duplex lifting frame in which the extending mast is guided in the stationary mast, is connected directly to the extending mast. In so-called triplex lifting frames, in which the extending mast (provided with the lifting carriage) is guided in an intermediate mast and the intermediate mast is guided in the stationary mast, in addition to the free-lift cylinder for raising the lifting carriage at least one lifting cylinder can be provided, by means of which the intermediate mast can be raised, the extending mast being capable of being raised by means of deflection rollers and lift chains, or at least one lifting cylinder can be provided for raising the intermediate mast and at least one further lifting cylinder can be provided for raising the extending mast. Owing to the large number of lifting cylinders or lift chains and deflection rollers, with lifting frames of the generic type there is a high degree of complexity in terms of design and the view onto the load or onto the roadway is often impeded. In the case of lifting cylinders arranged on the intermediate mast or the extending mast, there is also a high degree of complexity in design terms for * the pressure medium supply to the lifting cylinders since hydraulic lines for supplying the lifting cylinders need to be arranged in the extendable intermediate mast or in the extendable extending mast.
DE 4305 192 Al has disclosed a lifting frame of the generic type in the form of a triplex lifting frame. In order to raise the intermediate mast which can be extended in the stationary mast, a lifting cylinder is arranged on the right-hand vertical rail of the stationary mast, the piston rod of said lifting cylinder being operatively connected to the intermediate mast. When the lifting cylinder is extended and therefore when the intermediate mast is raised, at the same time the extending mast is capable of being raised by means of deflection rollers and lift chains on both sides of the lifting frame. In order to raise the lifting carriage arranged in the extending mast, a further lifting cylinder is arranged on the left-hand vertical rail of the intermediate mast and is connected to a further lift chain, which is guided to the lifting carriage via deflection rollers and fixed to it. Such a lifting frame, owing to the high number of deflection rollers and lift chains and the supply of pressure medium for the lifting cylinder arranged on the intermediate mast, has a high degree of complexity in design terms.
The present invention is based on the object of making available a lifting frame of the type mentioned at the outset which has a low degree of complexity in design terms and impedes the view of the load to a low extent.
The object is achieved according to the invention by virtue of the fact that a lifting cylinder is provided and is arranged on the stationary mast, the lifting cylinder being operatively connected to the lifting carnage by means of a traction mechanism, and the extending mast being capable of being raised by means of the lifting cylinder. In a lifting frame according to the invention, therefore only one lifting cylinder arranged on the stationary mast is provided which is used, by means of a traction mechanism, for raising the lifting carriage, the extending mast also being capable of being raised by said lifting cylinder. In order to raise the lifting carriage and the extending mast, therefore only one fraction mechanism and one lifting cylinder arranged on the stationary mast are required. In comparison with lifting frames from the prior art, with a lifting frame according to the invention having a lifting cylinder arranged on the stationary mast for raising the extending mast and the lifting carriage, a reduced complexity in design terms results from the reduced number of lifting cylinders and the omission of lift chains and deflection rollers. In addition, owing to the omission of lifting cylinders and lift chains with the corresponding deflection rollers, the operator is provided with an improved view of the load or the roadway.
Furthermore, owing to the arrangement of the lifting cylinder on the stationary mast, a supply of energy. for example of pressure medium, to the lifting cylinder is possible with little complexity.
In accordance with a preferred embodiment of the invention, the lifting cylinder has a cylinder tube, which is fixed to the stationary mast, and at least one piston rod, which can be extended upwards and at whose end a deflection roller for the traction mechanism is arranged, the traction mechanism being connected to the stationary mast, being guided, via the deflection roller, to a first deflection roller arranged in the lower region of the extending mast, being guided from the first deflection roller to a second deflection roller arranged in the upper region of the extending mast and guided from the second deflection roller to the lifting carriage and fixed to the lifting carriage. In this case, the traction mechanism is guided from the stationary mast, via the deflection roller of the lifting cylinder and the first and second deflection rollers, to the lifting carriage, the lifting carriage and the extending mast being capable of being raised in a simple manner when the lifting cylinder is extended.
In accordance with an advantageous development of the invention, the lifting cylinder, with the piston rod retracted, extends only partially over the length of the stationary mast. As a result, an at least partial free lift of the lifting carriage can be achieved in a simple manner when the lifting cylinder * and the piston rod, which is located within the longitudinal extent of the stationary mast, are extended.
In accordance with one configuration of the invention, the traction mechanism can be fixed at a fixing point arranged on the stationary mast.
It is likewise possible, in accordance with an advantageous development of the invention, to provide a further lifting cylinder which is fixed to the stationary mast, the further lifting cylinder being operatively connected to the traction mechanism. With such a further lifting cylinder, the lifting carriage can additionally be raised by means of the traction mechanism, as a result of which a complete free lift of the lifting carriage can be achieved in a simple manner. Owing to the fact that the further lifting cylinder is fixed to the stationary mast, in this case the operator's view of the load or the roadway is not additionally impeded any further. In addition, owing to the fact that the further lifting cylinder is fixed to the stationary mast, a supply of energy to the further lifting cylinder is possible in a simple manner and with little complexity in design terms.
In accordance with a preferred configuration, the further lifting cylinder has a cylinder tube, which is fixed to the stationary mast, and an upwardly extendable piston rod, to which the traction mechanism is fixed. As a result, the lifting carriage can be raised by the piston rod of the further lifting cylinder being retracted by means of the traction mechanism, as a result of which an additional free lift of the lifting carriage can be achieved in a simple manner.
In addition, in accordance with a further configuration of the invention it is possible for the further lifting cylinder to have a cylinder tube, which is fixed to the stationary mast, and a downwardly extendable piston rod, at whose end a deflection roller for the traction mechanism is arranged, the traction mechanism being fixed at the fixing point arranged on the stationary mast. A complete free lift of the lifting carriage can be achieved in a simple manner by the extension of the piston rod using such a lifting cylinder.
If, in accordance with an advantageous configuration of the invention, the lifting carriage is capable of being raised completely when the piston rod of the further lifting cylinder is completely retracted or extended and the stroke of the lifting cylinder is located within the longitudinal extent of * the stationary mast, a complete free lift of the lifting carriage can be achieved in a simple manner.
Expediently, in accordance with a preferred embodiment of the invention, a stop means for the lifting carriage is arranged in the upper region of the extending mast. The extending mast can therefore be raised by means of the traction mechanism when the piston rod of the lifting cylinder is extended once the stop means has been reached by the lifting carriage on continued extension of the piston rod of the lifting cylinder. As a result, in particular in the case of a lifting frame according to the invention in the form of a duplex lifting frame with a full free lift of the lifting carriage, the lifting carriage and the extending mast can be raised by the lifting cylinder.
In the case of a lifting frame according to the invention in the form of a triplex lifting frame, in which the extending mast is guided in an intermediate mast, and the intermediate mast is guided in the stationary mast, in accordance with a configuration of the invention, the extending mast and the intermediate mast can be raised when the piston rod of the lifting cylinder is extended once the stop means has been reached by the lifting carriage when the piston rod of the lifting cylinder is extended further by means of the traction mechanism. As a result, a lifting frame in the form of a triplex lifting frame, in particular a triplex lifting frame with a complete free lift of the lifting carriage, can be raised in a simple manner using the lifting * cylinder.
In the case of a lifting frame according to the invention in the form of a duplex lifting frame with an extending mast, which is guided in the stationary mast, in accordance with a further embodiment of the invention, a stop element is arranged in the upper region of the extending mast, the piston rod * of the lifting cylinder being capable of being operatively connected to the stop element for the purpose of raising the extending mast during the extension once the lifting carriage has been raised. When the piston rod of the lifting cylinder is extended, first the lifting carriage is therefore capable of being raised by means of the traction mechanism. When the stop element is reached, the extending mast is capable of being raised when the piston rod of the lifting cylinder is extended further. As a result, in particular in the case of a duplex lifting frame according to the invention with a partial free lift of the lifting carriage, the lifting carriage and the extending mast can be raised by means of the lifting cylinder.
In the case of a lifting frame according to the invention in the form of a triplex lifting frame, in which the extending mast is guided in an intermediate mast, and the intermediate mast is guided in the stationary mast, in accordance with an advantageous embodiment of the invention, a stop element is arranged in the upper region of the intermediate mast, the piston rod of the lifting cylinder being capable of being connected to the stop element for the purpose of raising the intermediate mast during the extension once the lifting carriage has been raised, the extending mast being capable of being raised by means of the traction mechanism. When the piston rod of the lifting cylinder is extended, first the lifting carriage is therefore capable of being raised by means of the traction mechanism. When the stop element is reached, the intermediate mast is capable of being raised by means of the stop element when the piston rod of the lifting cylinder is extended further, the extending mast being raised at the same time by means of the traction mechanism. In a triplex lifting frame according to the invention with a partial or complete free lift of the lifting carriage, both the lifting carriage and the intermediate mast as well as the extending mast can therefore be raised in a simple manner by means of the lifting cylinder.
Particular advantages result here if, substantially at the same time as the stop element is reached by the piston rod of the lifting cylinder, the lifting carriage can be operatively connected to the stop means. Owing to the fact that the lifting cylinder stops against the stop element and the lifting carriage stops against the stop means substantially at the same time, there is only one jerk in the motion when the lifting carriage is raised and the extending mast and the intermediate mast which may be provided are extended. The piston rod of the lifting cylinder reaching the stop element and the lifting carriage reaching the stop means substantially at the same time can also be understood within the context of the invention to mean when the stop element for the piston rod of the lifting cylinder and the stop means for the lifting carriage are spaced a short distance apart from one another in terms of the lifting range, for example a distance of 50 mm. At such a distance a gentle movement transition between the raising of the lifting carriage and the extension of the extending mast as well as of the intermediate mast which may be provided can be achieved in particular during a raising motion.
In terms of impeding the operator's view of the load or the roadway to a small extent, it is particularly advantageous if the lifting cylinder and/or the further lifting cylinder are arranged in the region of the vertical rails of the lifting frame. As a result, there is no lifting cylinder arranged in the field of vision of the operator between the vertical rails of the lifting frame in the case of a lifting frame according to the invention.
Since a lifting cylinder and/or a further lifting cylinder are hereby arranged only on one side of the lifting frame, a force distribution which is not compensated for results. In accordance with an embodiment of the invention, this force distribution can be compensated for by a symmetrical arrangement, in which in each case one lifting cylinder and/or a further lifting cylinder is arranged in the region of the vertical rails of the lifting frame.
Expediently, the effective piston area of the further lifting cylinder is smaller than the effective piston area of the lifting cylinder. In an embodiment in which the traction mechanism is fixed directly to the piston rod of the further lifting cylinder, there is a speed ratio of 2:1 when the lifting carriage is raised by the lifting cylinder and by the further lifting cylinder. As a result, a correspondingly small piston area can be provided for the further hydraulic cylinder, which acts as an additional free-lift cylinder for achieving a complete free lift of the lifting carriage, as a result of which the further lifting cylinder requires a correspondingly small amount of physical space on the vertical rails of the lifting frame and therefore causes the view of the load or the roadway to be impeded to a low extent and has a low production complexity.
In accordance with a preferred embodiment of the invention, the first deflection roller and/or the second deflection roller are arranged such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage, is arranged in the region of the longitudinal mid-axis of the lifting frame. In the field of vision between the vertical rails of the lifting frame, therefore only the traction mechanism is arranged in a lifting frame according to the invention.
In accordance with an advantageous development of the invention, the first deflection roller and/or the second deflection roller are arranged* such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage, is arranged in a viewing axis of the operator. As a result, the section of the traction mechanism which is guided from the first deflection roller to the second deflection roller and the section of the traction mechanism which is guided from the second deflection roller to the lifting carriage are arranged one behind the other and therefore aligned in a viewing axis of the operator. The extent to which the view of the load or the roadway is impeded can therefore be reduced further in the case of a lifting frame according to the invention.
In accordance with a further advantageous development of the 4nvention, the first deflection roller and/or the second deflection roller can likewise be arranged such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage, is arranged in the regi.on of the vertical rails of the lifting frame. In a lifting frame according to the invention, there are therefore no components arranged within the field of vision of the operator between the vertical rails of the lifting frame, as a result of which the view of the load or the roadway is not impeded by lilting cylinders or lift chains.
It is likewise possible, in accordance with a further embodiment of the invention, to arrange the first deflection roller and/or the second deflection roller in such a way that the section of the traction mechanism which is guided from the first deflection roller to the second deflection roller is arranged in the region of the vertical rails of the lifting frame and the section of the traction mechanism which is guided from the second deflection roller to the lifting carriage is arranged in the region of the longitudinal mid-axis of the lifting frame. As a result, the extent to which the view of the load or the roadway is impeded is low since only the section of the traction mechanism which is guided from the second deflection roller to the lifting carriage is
arranged in the operator's field of vision.
In a lifting frame according to the invention, the lifting cylinder can be in the form of a single-stage lifting cylinder with an exteridable piston rod.
Such a lifting cylinder has little manufacturing complexity.
In addition, the lifting cylinder can be in the form of a multi-stage lifting cylinder with a plurality of extendable piston rods. With such a lifting cylinder in the form of a telescopic cylinder, a complete free lift of the lifting carriage can be achieved in a simple manner in the case of a lifting frame in the form of a duplex lifting frame or the intermediate mast can be raised by the lifting cylinder in the case of a lifting frame in the form of a triplex lifting frame in addition to a partial or complete free lift of the lifting carriage.
In accordance with an advantageous configuration of the invention, a supply line, which is arranged in the lower region of the stationary mast, is * provided for supplying the lifting cylinder and/or the further lifting cylinder. In a lifting frame according to the invention in which no supply lines are required in the extendable lifting frame parts, a supply. for example of pressure medium, to the lifting cylinder and the further lifting cylinder can be made possible hereby with little complexity in design terms.
The traction mechanism of a lifting frame according to the invention can be in the form of a lift chain. However, it is likewise possible to use a pulling strap as the traction mechanism.
Further advantages and details of the invention will be explained in more detail with reference to the exemplary embodiments illustrated in the schematic figures, in which: Figures 1 a to 1 c show a first embodiment of a lifting frame according to the invention in various operating states, Figures 2a to 2c show a second embodiment of a lifting frame according to the invention in various operating states, Figures 3a to 3c show a third embodiment of a lifting frame according to the invention in various operating states, Figures 4a to 4c show a fourth embodiment of a lifting frame according to the invention in various operating states, and Figures 5a to 5cs how a fifth embodiment of a lifting frame according to the invention in various operating states.
Figures 10 to 1 c show a first embodiment of a lifting frame 1 according to the invention in various extended positions. The lifting frame 1 is in the form of a so-called duplex lifting frame having a stationary mast 2, in the form of an external mast, and an extending mast 3, in the form of an internal mast.
The stationary mast 2 is connected to the chassis of an industrial truck in a manner which is not illustrated in any more detail and has laterally spaced-apart vertical rails 2a, 2b. The extending mast 3 has vertical rails 3a, 3b, which are mounted extendably in the rails 2a, 2b of the stationary mast 2 by means of supporting rollers (not illustrated in any more detail). A lifting carriage 4 is * guided movably in the vertical direction by means of supporting rollers (not illustrated in any more detail) on the rails 3a, 3b of the extending mast 3.
In the region of the left-hand vertical rails 2a, 3a of the lifting frame 1, a lifting cylinder 5 is arranged on the stationary mast 2. The lifting cylinder 5 has a cylinder tube 5a, which is fixed on the vertical rail 2a of the stationary mast 2 in a manner which is not illustrated in any more detail and in which an upwardly extendable piston rod 5b is arranged. The upper end of the piston rod 5b is operatively connected to a deflection roller 6, on which a fraction mechanism 7 in the form of a lift chain, for example, is guided. The traction mechanism 7 is in this case fixed to the left-hand vertical rail 2a of the stationary mast 2 by means of a fixing point 8. In this case, as can be seen in Figure 1 a, the fixing point 8 is arranged beneath the deflection roller 6 with the lifting cylinder 5 completely retracted.
The traction mechanism 7 is guided from the fixing point 8, via the deflection roller 6. to a first deflection roller 9, which is arranged in the lower region of the extending mast 3, for example on a lower transverse strut 3c of the extending mast 3. The fraction mechanism 7 is guided from the first deflection roller 9 to a second deflection roller 10, which is arranged in the upper region of the extending mast 3, for example on an upper transverse strut 3d of the extending mast 3. The traction mechanism 7 is guided from the second deflection roller 10 to the lifting carriage 4 and fixed to it.
In order to supply pressure medium to the lifting cylinder 5, a supply line 11 in the form of a pressure medium line is provided which is arranged in the lower region of the stationary mast 2.
Figure 1 a illustrates the lifting frame 1 in the lower end position, in which the lifting carriage 4 is completely lowered. The lifting cylinder 5 in this case extends not over the entire length of the stationary mast 2, but merely partially over this length when the piston rod 5b is retracted.
When pressure medium present in the supply line 11 is applied to the liffing cylinder 5, the piston rod 5b and therefore the deflection roller 6 extend * upwards. In this case, the lifting carriage 4 is raised into the position illustrated in Figure 1 b by means of the traction mechanism 7, which is guided via the deflection roller 6 arranged on the piston rod 5b and the first deflection roller 9 and the second deflection roller 10 and is fixed to the fixing point 8 and to the lifting carriage 4.
Figure 1 b illustrates the lifting frame 1 in the free-lift position. In the upper region of the extending mast 3, for example on the upper transverse strut 3d of the extending mast 3, a stop element 12 is furthermore arranged, to which the piston rod 5b can be operatively connected. For this purpose, a clip, which is not illustrated in any more detail and surrounds the deflection roller 6. can be arranged on the piston rod 5b. In the free-lift position illustrated in Figure 1 b, the partially extended piston rod 5b comes to bear against the stop element 12. In this position of the lifting frame 1, a partial free lift of the lifting carriage 4 is achieved, the lifting carriage 4 being raised partially in the extending mast 3 when the extended piston rod 5b of the lifting cylinder 5 is arranged within the longitudinal extent of the vertical rails 2a, 2b of the stationary mast 2.
When further pressure medium is applied to the lifting, cylinder 5. the extending mast 3 is raised by means of the piston rod 5b when if is extended further over the stop element 12 and, at the same time, the lifting carriage 4 is raised further by means of the traction mechanism 7 guided via the deflection roller 6.
With the piston rod 5b completely extended, the lifting frame 1 is located in the upper end position illustrated in Figure 1 c, in which the lifting carriage 4 is completely raised and the extending mast 3 is completely extended.
Figures 2a to 2c illustrate a lifting frame 1 according to the invention in the form of a duplex lifting frame, which is provided with a complete free lift of the lifting carriage 4. Identical components to those in Figures 1 a to 1 c are in this case provided with the same reference symbols.
* With the lifting frame 1 illustrated in Figures 2a to 2c, a further lifting cylinder 20 is provided in the region of the vertical rails 2a, 3a of the lifting frame 1, which further lifting cylinder 20 is operatively connected to the traction mechanism 7. The further lifting cylinder 20 has a cylinder tube 20a, which is fixed adjacent to the cylinder tube 5a of the lifting cylinder 5 on the vertical rail 2a of the stationary mast 2. The further lifting cylinder 20 has an upwardly extendable piston rod 20b, to which the traction mechanism 7, which is guided via the deflection roller 6, is fixed. In order to apply pressure medium to the further lifting cylinder 20, a supply line 110 in the form of a pressure medium line is provided which branches off from the supply line 11 in the form of a pressure medium line.
In the lower end position of the lifting frame 1 illustrated in Figure 2a, the piston rod 20b of the further lifting cylinder 20 is completely extended. The piston rod 5b of the lifting cylinder 5 is completely retracted.
When pressure medium present in the supply line 11 and the supply line 11 a is applied to the lifting cylinder 5 or the further lifting cylinder 20, in this case the piston rod 20b of the further lifting cylinder 20 enters the cylinder tube 20a downwards, as a result of which the lifting carriage 4 is raised by means of the traction mechanism 7, which is connected to the lifting carriage 4 via the deflection roller 6 arranged on the piston rod 5b of the lifting cylinder 5 and the first deflection roller 9 arranged in the lower region of the extending mast 3 and the second deflection roller 10 arranged in the upper region of the extending mast 3. When the pressure medium is present in the supply line 11 in the form of a pressure medium line, the piston rod 5b of the lifting cylinder 5 furthermore moves partially upwards, as a result of which the lifting carriage 4 is likewise raised by means of the traction mechanism 7.
In this case, the lifting frame 1 enters the free-lift position illustrated in Figure 2b, the lifting carriage 4 coming to bear against a stop means (which is not illustrated in any more detail) arranged in the upper region of the extending mast 3. In the free-lift positionillustrated in Figure 2b, in this case a * complete free lift of the lifting carriage 4 is achieved by means of the completely retracted piston rod 20b of the further lifting cylinder 20 and the partially extended piston rod 5b of the lifting cylinder 5. the lifting carriage 4 in the extending mast 3 being completely extended, and the partially extended piston rod 5b of the lifting cylinder 5 being arranged within the longitudinal extent of the stationary mast 2.
When further pressure medium present in the supply line 1 1 in the form of a pressure medium line is applied to the lifting cylinder 5, the piston rod 5b of the lifting cylinder 5 extends further, the extending mast 3 being raised by means of the lifting cylinder 5 and the traction mechanism 7, which is guided via the deflection roller 6 arranged on the piston rod 5b and the first deflection roller 9 and is fixed to the lifting carriage 4 located on the upper stop means and to the completely retracted further lifting cylinder 20. In this case, the lifting frame 1 enters the upper end position illustrated in Figure 2c, in which the extending mast 3 is completely extended and the lifting carriage 4 is completely raised.
Figures 3a to 3b illustrate a lifting frame 1 according to the invention in the form of a triplex lifting frame which is provided with a complete free lift for the lifting carriage 4. Identical components to those in Figures 1 a to 1 c and Figures 2a to 2c are in this case provided with the same reference symbols.
In the lifting frame 1 illustrated in Figures 3a to 3c, an intermediate mast is arranged between the stationary mast 2 in the form of an external mast and the extending mast 3 in the form of an internal mast. The intermediate mast 25 in this case has vertical rails 25a, 25b, which are guided in the vertical rails 2a, 2b of the stationary mast 2 by means of supporting rollers (not illustrated in any more detail). In this case, the vertical rails 3a, 3b of the extending mast 3 are guided by means of supporting rollers (not illustrated in any more detail) in the vertical rails 25a, 25b of the intermediate mast 25.
The lifting cylinder 5 and the further lifting cylinder 20 are arranged in the region of the left-hand vertical rails 2a, 3a, 25a of the lifting frame 1. The * cylinder tube 5a of the lifting cylinder 5 and the cylinder tube 20a of the lifting cylinder 20 are in this case fixed to the left-hand vertical rail 2a of the stationary mast 2 in a similar way to in Figures 2a to 2c.
In a further development of the lifting cylinder 5 illustrated in Figures 1 a to 1 c and Figures 2a to 2c, which lifting cylinder 5 is in the form of a single-stage lifting cylinder with an extendable piston rod 5b, the lifting cylinder 5 shown in Figures 3a to 3c is in the form of a multi-stage lifting cylinder, a so-called telescopic cylinder, having a plurality of piston rods 5b, 5c which are arranged such that they can extend one inside the other.
The piston rod 20b of the further lifting cylinder 20 is connected to the traction mechanism 7, in a similar manner to Figures 2a to 2c. The traction mechanism 7 is guided via the deflection roller 6, which is fixed to the piston rod 5b of the lifting cylinder 5, the first deflection roller 9, which is fixed to the lower region of the extending mast 3, and the second deflection roller 10, which is fixed to the upper region of the extending mast 3, to the lifting carriage 4 and fixed to it. In the upper region of the intermediate mast 25, for example on an upper transverse strut 25c of the intermediate mast 25, a stop element 26 is arranged to which the piston rod 5b of the lifting cylinder 5 can be operatively connected, for example by means of a clip which is not illustrated in any more detail on the piston rod 5b and surrounds the deflection roller 6.
Starting from the lower end position of the lifting frame 1 illustrated in Figure 3a with the lifting carriage 4 completely lowered, when pressure medium present in the supply lines 11 and 11 a in the form of pressure medium lines is applied to the lifting cylinders and the further lifting cylinder 20, in a similar manner to in Figures 2a and 2b. the lifting carriage 4 is raised by the piston rod 20b of the further lifting cylinder 20 being completely retracted and the piston rods 5b, 5c of the lifting cylinder 5 being partially extended by means of the traction mechanism 7, and this lifting carriage 4 enters the free-ift position illustrated in Figure 3b.
* In the free-lift position illustrated in Figure 3b, the lifting carriage 4 comes to bear against a stop means (which is not illustrated in any more detail) arranged in the upper region of the extending mast 3. Substantially at the same time, the piston rod 5b of the lifting cylinder 5 comes to bear against the stop element 26 arranged in the upper region of the intermediate mast 25. Owing to the fact that the stop means is reached by the lifting carriage 4 and the stop element 26 is reached by the piston rods 5b, 5c of the lifting cylinder 5 substantially at the same time, in this case only one jerk in the motion is achieved when extending the lifting frame 1.
In the free-lift position illustrated in Figure 3b, in this case a full free lift of the lifting carriage 4 is achieved, the lifting carriage 4 in the extending mast 3 being raised completely, and the partially extended piston rods 5b, 5c of the lifting cylinder 5 being arranged within the longitudinal extent of the stationary mast 2. The piston rod 20b of the further lifting cylinder 20 is in this case completely retracted.
When further pressure medium is applied to the lifting cylinder 5, the intermediate mast 25 is raised by means of the stop element 26 by the piston rods 5b, 5c of the lifting cylinder 5 being extended further. At the same time, the extending mast 3 is raised by means of the traction mechanism 7, which is guided via the deflection roller 6 arranged on the piston rod 5b and the first deflection roller 9 and is fixed to the lifting carriage 4 located on the upper stop means and to the completely retracted, further lifting cylinder 20. In this case, the lifting frame 1 enters the upper end position illustrated in Figure 3c, in which the intermediate mast 25 and the extending mast 3 are completely extended and the lifting carriage 4 is completely raised.
Figures 4a to 4c illustrate a further embodiment of a triplex lifting frame 1 according to the invention which is provided with a complete free lift for the lifting carriage 4. Identical components to those in Figures 1 a to 1 c and Figures 2a to 2c and 3a to 3c are in this case again provided with the same reference symbols.
* In this case the further lifting cylinder 20 has a piston rod 20b which can be extended downwards out of the cylinder tube 20a, which is fixed to the vertical rail 2a of the stationary mast 2. A deflection roller 40 for the traction mechanism 7, which is fixed at the fixing point 8 on the stationary mast 2, is fixed to the piston rod 20b.
In order to apply pressure medium to the further lifting cylinder 20, a supply line 11 a in the form of a pressure medium line is provided which is guided from the lifting cylinder 5 to the further lifting cylinder 20.
The traction mechanism 7 is in this case guided from the fixing point 8, via the deflection roller 40 of the further lifting cylinder 20, the deflection roller 6 of the lifting cylinder 5, the first deflection roller 9, which is arranged on the lower region of the extending mast 3, and the second deflection roller 10, which is arranged on the upper region of the extending mast 3, to the lifting carriage 4 and fixed thereto. The lifting cylinder 5 is in this case in the form of a single-stage lifting cylinder with an extendable piston rod 5b, the cylinder tube 5a being arranged on and fixed to the stationary mast 2.
In the lower end position of the lifting frame 1 illustrated in Figure 4a, the piston rod 20b of the further lifting cylinder 20 and the piston rod 5b of the lifting cylinder 5 are completely retracted.
When pressure medium present in the supply line 11 and the supply line 11 a is applied to the lilting cylinder 5 and the further lifting cylinder 20, in this case the piston rod 20b of the further lifting cylinder 20 moves downwards out of the cylinder tube 20a, as a result of which the lifting carriage 4 is raised by means of the traction mechanism 7, which is guided via the deflection roller and is fixed at the fixing point 8 and is connected to the lifting carriage 4 via the deflection roller 6, which is arranged on the piston rod Sb of the lifting cylinder 5, and the first deflection roller 9, which is arranged in the lower region of the extending mast 3, and the second deflection roller 10, which is arranged in the upper region of the extending mast 3.
* In this case, the lifting frame 1 moves into the free-lift position illustrated in Figure 4b, the lifting carriage 4 coming to bear against a stop means which is arranged on the upper region of the extending mast 2 and is no longer illustrated. In the free-lift position illustrated in Figure 4b, in this case a complete free lift of the lifting carriage 4 is achieved by means of the completely extended piston rod 20b of the further lifting cylinder 20. The lifting cylinder 5 is in this case not extended.
When further pressure medium present in the supp'y line 11 in the form of a pressure medium line is applied to the lifting cylinder 5, the piston rod 5b of the lifting cylinder 5 moves out, the extending mast 3 and the intermediate mast 25 being raised by means of the lifting cylinder 5 and the traction mechanism 7 and possibly the stop element 26 as shown in Figures 3a to 3c.
In this case, the lifting frame 1 moves into the upper end position illustrated in Figure 4c, in which position the extending mast 3 and the intermediate mast are completely extended and the lifting carriage 4 is completely raised.
In the case of the lifting frames 1 according to the invention illustrated in Figures 1 a to 1 c, 2a to 2c, 3a to 3c and 4a to 4c, in particular the lifting frame 1 according to the invention in the form of a duplex lifting frame with partial free lift of the lifting carriage 4, as shown in Figures la to 1 c, only one lifting cylinderS and only one traction mechanism 7, for example in the form of a lift chain, are therefore required for at least partially raising the lifting carriage 4 and for completely extending the extending mast 3 and the intermediate mast 25, only three deflection rollers 6, 9, 10 or four deflection rollers 6, 9, 10 and 10 being required for the traction element 7.
With a further lifting cylinder 20 having a low requirement in terms of physical space, in a lifting frame as shown in Figures 2a to 2c, 3a to 3c and 4a to 4c a complete free lift of the lifting carriage 4 can be achieved in a simple manner.
Owing to the arrangement of the lifting cylinder 5 and the further lifting cylinder 20 in the region of the vertical rail 2a of the stationary mast 2, in the lifting frames 1 according to the invention as shown in Figures 1 a to 1 C, Figures 2a to 2c, Figures 3a to 3c and Figures 4a to 4c, the view of the load or the roadway is impeded to a low extent in the position of the lifting carriage 4 in which it is lowered (illustrated in Figures 1 a, 2a, 3a and 4a), and in the partially or completely raised position of the lifting carriage 4 illustrated in Figures 1 b, 1 c, 2b, 2c, 3b, 3c and 4b, 4c. Only the traction mechanism 7, which is guided via only three deflection rollers 6, 9, 10, is arranged in the field of vision of the operator within the vertical rails 2a, 2b of the stationary mast and the vertical rails 3a, 3b of the extending mast 3 or the vertical rails 25a, 25b of the intermediate mast 25. Owing to an arrangement of the deflection roller 9 and/or 10 which is rotated with respect to the longitudinal mid-axis of the lifting frame 1 illustrated as in Figures 1 a to 1 c, 2a to 2c, 3a to 3c and 4a to 4c, a situation can also be achieved in which the section of the traction mechanism 7 which is guided from the deflection roller 9 to the deflection roller 10 and the section of the traction mechanism 7 which is guided from the deflection roller 10 to the lifting carriage 4 lie in a viewing axis of the operator, as a result of which the extent to which the view is impeded by the traction mechanism 7 can be reduced further.
In the case of the lifting frame 1 which is in the form of a triplex lifting frame and is illustrated in Figures 5a to 5c, in each case one lifting cylinder 5 and possibly a further lifting cylinder 20 with a corresponding traction mechanism 7 is arranged both on the left vertical rails 2a, 3a, 25a and on the right vertical rails 2b, 3b, 25b of the lifting frame 1. The formation of the lifting cylinder 5 and the further lifting cylinder 20 in this case corresponds to the embodiment illustrated in Figures 4a to 4c. However, it is likewise possible to arrange the formation of the lifting cylinder 5 or the further lifting cylinder 20 shown in Figures 1 a to 1 c, 2a to 2c or 3a to 3c in the case of a lifting frame 1 shown in Figures 5a to 5c. In addition, the lifting frame 1 shown in Figures 5a to 5c can also merely be in the form of a duplex lifting frame.
* The symmetrical arrangement of the lifting cylinder 5 and possibly of the further lifting cylinder 20 on the two vertical rails 2a, 30, 25a and 2b, 3b, 25b, respectively, of the lifting frame 1 results in a compensated force distribution. In this case, the deflection rollers 9 and 10 can furthermore be arranged in the region of the respective vertical rails 2a, 3a, 25a and 2b, 3b, 25b of the lifting frame 1, as a result of which the traction mechanism 7 is arranged in each case in the region of the vertical rails 2a, 3a, 25a and 2b, 3b, 25b. In the case of a lifting frame 1 shown in Figures 5a to 5c, there is therefore no traction mechanism 7 arranged between the vertical rails 2a, 2b, 30, 3b or 25a, 25b of the lifting frame 1 within the operator's field of vision, as a result of which the view of the load or the roadway is not impeded by the lifting cylinders 5, 20 or the traction mechanism 7.
With lifting frames 1 according to the invention, owing to the arrangement of the fraction mechanism 7 in the form of a lift chain, for example, the lift chain is effectively prevented from rattling and stopping against the vertical rails of the lifting frame, as a result of which a lifting frame according to the invention has little wear and low maintenance.
However, it is also possible, in the lifting frames 1 shown in Figures la to 4c, to arrange the traction mechanism 7, which is guided from the deflection roller 9 to the deflection roller 10, in the region of the vertical rails of the lifting frame, for example the right-hand vertical rails 2b, 3b, 25b, as a result of which the extent to which the operator's view of the load or the roadway is impeded is further reduced. For this purpose, the diameter of the deflection rollers 9, 10 can be increased or further deflection rollers can be arranged in the region of the right-hand vertical rails, about which further deflection rollers the traction mechanism 7 is guided.
Owing to the arrangement of the lifting cylinder 5 and fhe further lifting cylinder 20 on the stationary mast 2, a supply of energy is also possible with little complexity in design terms since, in the case of a lifting frame 1 according to the invention, no supply lines are required on the extending mast 3 and the intermediate mast 25.
Instead of the lifting cylinder 5 in the form of a telescopic cylinder and having a plurality of piston rods 5b. 5c, as is used in Figures 3a to 3c, likewise in the case of a lifting frame 1 as shown in Figures 3a to 3c a single-stage lifting cylinder 5 with a piston rod 5b can be used. In addition, it is possible to use a lifting cylinder 5 in the form of a telescopic cylinder having a plurality of extendable piston rods 5b, 5c in lifting frames 1 as shown in Figures la to ic, Figures 2a to 2c and Figures 4a to 4c or 5a to 5c instead of a single-stage lifting cylinder 5 having one piston rod 5b.
In addition, it is possible to provide only a partial free lift of the lifting carriage 4 as shown in the lifting frame 1 shown in Figures 1 a to 1 c instead of the full free lift of the lifting carriage 4. whilst dispensing with the further lifting cylinder 20, in the case of a lifting frame 1 in the form of a triplex lifting frame as shown in Figures 3a to 3c.
Furthermore, it is possible to design a lifting cylinder 5. in the form of a telescopic cylinder, as shown in Figures 3a to 3c in such a way that a complete free lift of the lifting carriage 4 in the free-lift position illustrated in Figure 3b can be achieved without a further lifting cylinder 20.
Instead of fixing the cylinder tubes 5a. 20a of the lifting cylinders 5. 20 to the stationary mast 2. it is naturally likewise possible to fix the piston rods 5b.
20b of the lifting cylinders 5. 20 to the stationary mast 2 and to arrange the cylinder tubes 5a, 20a of the lifting cylinders 5. 20 in extendable fashion.
Instead of hydraulic lifting cylinders 5 and 20, electrical lifting cylinders and 20 can likewise be provided, for example screw drives with extendable piston rods in the form of threaded spindles. The supply lines 11 and 11 a are in this case in the form of electrical supply lines, with a supply of electrical energy to the electrical lifting cylinders being made possible with little design complexity since, in the case of a lifting frame 1 according to the invention.
no electrical supply lines are required on the extending mast 3 and the intermediate mast 25.
The arrangement of the lifting cylinder 5 and the further lifting cylinder as shown in Figures 1 a to 1 c, 2a to 2c, 3a to 3c and 4a to 4c in the region of the left vertical rails of the lifting frame 1 results in the view of the load or the roadway being impeded to a small extent when an operator of the industrial truck, for example a reach fork-lift truck or a reach truck, is located, for example sitting or standing, in the region of the right vertical rails. If the operator should be sitting or standing in the region of the left vertical rails of the lifting frame, a situation can be achieved in which the view is impeded to a small extent by the lifting frame 1 if, in the embodiments shown in Figures 1 a to 1 c, 2a to 2c, 3a to 3c and 4a to 4c, the lifting cylinder 5 and the further lifting cylinder 20 are arranged correspondingly in the region of the right vertical rails of the lifting frame 1.

Claims (26)

  1. * Claims 1. A lifting frame for an industrial truck having a stationary
    mast which cannot be raised and an extending mast, which can be raised in relation to the stationary mast, a lifting carriage being guided such that it can move in the vertical direction on the extending mast, characterised in that a lifting cylinder is provided and is arranged on the stationary mast, the lifting cylinder being operatively connected to the lifting carriage by means of a traction mechanism, and the extending mast being capable of being raised by means of the lifting cylinder.
  2. 2. A lifting frame according to Claim 1, characferised in that the lifting cylinder has a cylinder tube, which is fixed to the stationary mast, and at least one piston rod, which can be extended upwards and at whose end a deflection roller for the traction mechanism is arranged, the traction mechanism being connected to the stationary mast, being guided, via the deflection roller, to a first deflection roller arranged in the lower region of the extending mast, being guided from the first deflection roller to a second deflection roller arranged in the upper region of the extending mast and guided from the second deflection roller to the lifting carriage and fixed to the lifting carriage.
  3. 3. A lifting frame according to Claim 1 or 2, characterised in that the lifting cylinder, with the piston rod retracted, extends only partially over the length of the stationary mast.
  4. 4. A lifting frame according to one of Claims 1 to 3, characterised in that the traction mechanism is fixed at a fixing point arranged on the stationary mast.
    *
  5. 5. A lifting frame according to one of Claims 1 to 4, characterised in that a further lifting cylinder is provided which is fixed to the stationary mast, the further lifting cylinder being operatively connected to the traction mechanism.
  6. 6. A lifting frame according to Claim 5, characterised in that the further lifting cylinder has a cylinder tube, which is fixed to the stationary mast, and an upwardly extendable piston rod, to which the traction mechanism is fixed.
  7. 7. A lifting frame according to Claim 5, characterised in that the further lifting cylinder has a cylinder tube, which is fixed to the stationary mast, and a downwardly extendable piston rod, at whose end a deflection roller for the traction mechanism is arranged, the traction mechanism being fixed at the fixing point arranged on the stationary mast.
  8. 8. A lifting frame according to Claim 6 or 7, characterised in that the lifting carriage is capable of being raised by the piston rod of the further lifting cylinder being retracted or extended.
  9. 9. A lifting frame according to one of Claims 5 to 8, characterised in that the lifting carriage is capable of being raised completely when the piston rod of the further lifting cylinder is completely retracted or extended and the stroke of the lifting cylinder is located within the longitudinal extent of the stationary mast.
  10. 10. A lifting frame according to one of Claims 1 to 9, characterised in that a stop means for the lifting carriage is arranged in the upper region of the extending mast.
  11. * 1 L A lifting frame according to Claim 10, characterised in that the extending mast is capable of being raised by means of the traction mechanism when the piston rod of the lifting cylinder is extended once the stop means has been reached by the lifting carriage on continued extension of the piston rod of the lifting cylinder.
  12. 12. A lifting frame according to either of Claims 10 and 11, the extending mast being guided in an intermediate mast, which is guided in the stationary mast, characterised in that the extending mast and the intermediate mast can be raised when the piston rod of the lifting cylinder is extended once the stop means has been reached by the lifting carriage when the piston rod of the lifting cylinder is extended further by means of the traction mechanism.
  13. 13. A lifting frame according to one of Claims 2 to 10, the extending mast being guided in the stationary mast, characterised in that a stop element is arranged in the upper region of the extending mast, the piston rod of the lifting cylinder being capable of being operatively connected to the stop element for the purpose of raising the extending mast during the extension once the lifting carriage has been raised.
  14. 14. A lifting frame according to one of Claims 2 to 11, the extending mast being guided in an intermediate mast, which is guided in the stationary mast, characterised in that a stop element is arranged in the upper region of the intermediate mast, the piston rod of the lifting cylinder being capable of being connected to the stop element for the purpose of raising the intermediate mast during the extension once the lifting carriage has been raised, the extending mast being capable of being raised by means of the traction mechanism.
    *
  15. 15. A lifting frame according to Claim 14, characterised in that, substantially at the same time as the stop element is reached by the piston rod of the lifting cylinder, the lifting carriage can be operatively connected to the stop means.
  16. 16. A lifting frame according to one of Claims 1 to 15, characterised in that the lifting cylinder and/or the further lifting cylinder are arranged in the region of the vertical rails of the lifting frame.
  17. 17. A lifting frame according to one of Claims 1 to 15, characterised in that in each case one lifting cylinder and/or a further lifting cylinder are arranged in the region of the vertical rails.
  18. 18. A lifting frame according to one of Claims 5 to 17, characterised in that the effective piston area of the further lifting cylinder is smaller than the effective piston area of the lifting cylinder.
  19. 19. A lifting frame according to one of Claims 2 to 18, characterised in that the first deflection roller and/or the second deflection roller are arranged such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage, is arranged in the region of the longitudinal mid-axis of the lifting frame.
  20. 20. A lifting frame according to one of Claims 2 to 19, óharacterised in that the first deflection roller and/or the second deflection roller are arranged such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage, is arranged in a viewing axis of the operator.
    *
  21. 21. A lifting frame according to one of Claims 2 to 18, characterised in that the first deflection roller and/or the second deflection roller are arranged such that the traction mechanism, which is guided from the first deflection roller, via the second deflection roller, to the lifting carriage (4). is arranged in the region of the vertical rails of the lifting frame.
  22. 22. A lifting frame according to one of Claims 2 to 18, characterised in that the first deflection roller and/or the second deflection roller are arranged such that the section of the traction mechanism which is guided from the first deflection roller to the second deflection roller is arranged in the region of the vertical rails of the lifting frame and the section of the traction mechanism which is guided from the second deflection roller to the lifting carriage is arranged in the region of the longitudinal mid-axis of the lifting frame.
  23. 23. A lifting frame according to one of Claims 1 to 22, characterised in that the lifting cylinder is in the form of a single-stage lifting cylinder.
  24. 24. A lifting frame according to one of Claims 1 to 22, characterised in that the lifting cylinder is in the form of a multi- stage lifting cylinder.
  25. 25. A lifting frame according to one of Claims 1 to 24, characterised in that a supply line, which is arranged in the lower region of the stationary mast, is provided for supplying the lifting cylinder and/or the further lifting cylinder.
  26. 26. A lifting frame according to one of Claims 1 to 25, characterised in that the traction mechanism is in the form of a lift chain.
GB0809095.3A 2007-05-21 2008-05-20 Lifting frame for an industrial truck Expired - Fee Related GB2449543B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023594 2007-05-21
DE102008018032.7A DE102008018032B4 (en) 2007-05-21 2008-04-09 Lifting frame for an industrial truck

Publications (3)

Publication Number Publication Date
GB0809095D0 GB0809095D0 (en) 2008-06-25
GB2449543A true GB2449543A (en) 2008-11-26
GB2449543B GB2449543B (en) 2012-05-23

Family

ID=39596153

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
GB (1) GB2449543B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803066A (en) * 1954-02-08 1958-10-15 Emmanuel Kaye Improvements in or relating to mast lift trucks
US3221840A (en) * 1963-03-18 1965-12-07 Cascade Corp Load-lifting structure with latch mechanism
DE2020276A1 (en) * 1970-04-25 1971-11-11 Ind Saar Gmbh A lift truck with a three-part telescopic mast
GB2053153A (en) * 1979-07-02 1981-02-04 Jungheinrich Kg Lift truck
US4421208A (en) * 1981-02-09 1983-12-20 Clark Equipment Company Upright fork lift truck
EP0881191B1 (en) * 1997-05-29 2003-05-02 The Raymond Corporation Carriage suspension for lift truck
US20050133311A1 (en) * 2003-11-10 2005-06-23 Linde Aktiengesellschaft Lifting framework for an industrial truck

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803066A (en) * 1954-02-08 1958-10-15 Emmanuel Kaye Improvements in or relating to mast lift trucks
US3221840A (en) * 1963-03-18 1965-12-07 Cascade Corp Load-lifting structure with latch mechanism
DE2020276A1 (en) * 1970-04-25 1971-11-11 Ind Saar Gmbh A lift truck with a three-part telescopic mast
GB2053153A (en) * 1979-07-02 1981-02-04 Jungheinrich Kg Lift truck
US4421208A (en) * 1981-02-09 1983-12-20 Clark Equipment Company Upright fork lift truck
EP0881191B1 (en) * 1997-05-29 2003-05-02 The Raymond Corporation Carriage suspension for lift truck
US20050133311A1 (en) * 2003-11-10 2005-06-23 Linde Aktiengesellschaft Lifting framework for an industrial truck

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Publication number Publication date
GB2449543B (en) 2012-05-23
GB0809095D0 (en) 2008-06-25

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140520