EP1627846B1 - Lift truck with an enlarged visual range - Google Patents

Description

The present invention relates to industrial trucks with the features of the preamble of claim 1 or of claim 2 in general and in particular relates to industrial trucks with a displaceable together with the load-receiving means driver's seat carrier.

Such trucks are well known in the art.

In such trucks located in the field of view of the driver in the Vorwärtsverfahrrichtung the truck, in which the truck is moved the vast majority of its travel time, a number of components of the truck, which hinder the view of the truck driver. These components include structural elements of load transfer means, moving drives for load transfer means, power transmission and power transmission means between movement drives and associated moving components of the truck, electrical lines, hydraulic and possibly pneumatic lines, etc.

From the GB 2 046 705 A is an industrial truck with a load-carrying means displaceably carrying mast known, the mast comprises a truck frame fixed lifting stand and a guided on Hubständer and adjustable relative to this in the longitudinal direction of the first lifting frame.

At least one piston-cylinder unit is provided as a drive for the displacement of the load-receiving means, wherein the piston is connected to two deflection rollers for deflecting the force applied by the piston-cylinder unit and wherein the deflection rollers are in the longitudinal extension region of the piston-cylinder unit.

Likewise is from the GB 2 046 705 A a corresponding truck, in which the mast comprises a second lifting frame, which is guided on the first lifting frame relative to this for movement substantially in Hubstanderlängsrichtung.

The driver's seat is at the industrial trucks GB 2 046 705 A stationary with respect to the lifting stand.

It is an object of the present invention to provide an industrial truck in which the driver has a field of view as limited as possible in the forward travel direction.

This object is achieved by an industrial truck with the features of claim 1 or with the features of claim 2.

The solution of the problem underlying the invention relates to the management of cables on the truck, in particular of a cable with which control commands from a control panel, such as a driver station carrier, can be transmitted to a control unit on the truck frame. It should not be ruled out that more signals or drive energy can be transmitted in both directions via such a cable. The leadership of such cables is particularly important for industrial trucks with movable, in particular lift and lowerable driver station carrier of great importance, since in this case changes in operation, the distance between the control panel or the driver's seat carrier and the frame-fixed control unit.

More particularly, the present invention relates to an industrial truck with a load-carrying means displaceably supporting mast, which comprises a truck frame fixed lifting stand and at least one guided on Hubständer and adjustable relative to this in the longitudinal direction lifting frame, wherein a cable for transmitting control signals between a truck frame fixed control unit and a control unit runs, which is provided on a on the lifting frame relative to this movably guided driver's seat carrier.

In such trucks, the control cable is so far the last time at an upper end cross bar of a driver's seat carrier adjustable stored Hubständers down, d. H. towards the footprint of the truck, led to the driver's seat carrier. Therefore, the cable penetrates part of the field of vision of the driver.

The driver's field of vision, on the other hand, can be largely kept free of this cable, if the power transmission means deflection is provided so that the cable starting from its end frame fixed end up to a first cable deflection on the Hubständer, from there down to a second Kabelumlenkstelle on the lifting frame and from there up to the driver's seat carrier runs.

The same inventive idea is also applicable to an industrial truck with a mast from a lifting stand and two movably guided lifting frame, more precisely to an industrial truck with a lifting device carrying a lifting mast, which is a truck frame fixed lifting stand, a first guided on Hubständer and relative to this in the longitudinal direction comprises adjustable lifting frame and a second lifting frame, which is guided on the first lifting frame relative to this for movement substantially in Hubstanderlängsrichtung, wherein a cable for transmitting control signals between a truck frame fixed control unit and an operating unit, which at one of the second lifting frame relative to this is provided in the Hubständerlängsrichtung movably guided driver's seat carrier.

In such a truck, the cable can be arranged in an advantageous manner without significant field of view impairment of the driver when the cable, starting from its end of the truck frame solid up to a first cable deflection on the lift stand, from there down to a second Kabelumlenkstelle on the first lifting frame and from there upwards to a third deflection point on a motion in a fixed movement relative to the driver space carrier moving movement part and from there to the driver place carrier runs.

"Upwards" in the sense of the present application should be understood to mean that the course direction of the cable section has a component pointing away from the footprint of the industrial truck. Accordingly, the course direction of a "downward" extending cable section on a component of the footprint on.

Usually, trucks with lift stand, a lifting frame and a movable frame on the lifting frame driver carrier are designed such that the movement of the driver station carrier has a fixed movement relationship to the movement of the lifting frame. This is often 2: 1, so that the cable can be deflected at each deflection by 180 °, which allows a meandering placement of the cable in a very small space.

This movement relationship is realized by selecting appropriate dimensioning of the piston surfaces of the respective components for movement driving piston-cylinder units. The different piston-cylinder units are fluidly connected in parallel, so that the same fluid pressure in the different piston-cylinder units leads to different forces.

In the second alternative, namely a truck with Hubständer, first and second lifting frame, the driver's seat carrier can be guided by the second lifting frame in a very advantageous manner independent of movement, d. H. the vehicle carrier is displaceable independently of the movement of the lifting frame. The movements of the lifting frame relative to the lifting stand, however, generally have a fixed movement relationship. This is often 2: 1, so that the first and second lifting frame are always adjusted simultaneously, the second lifting frame compared with the first travels the double displacement path. This also makes 180 ° deflections of the cable at the respective deflection points possible, so that the retained cable length can be provided in a meandering manner in a very small volume of construction.

In order to prevent the cable from being detached from the first or / and the second deflection point, these deflection points should be arranged in such a way that the first deflection point is located above the second deflection point relative to the lifting support footprint when the lifting frame is fully extended relative to the lifting stand.

Otherwise, the concrete arrangement of the deflection is freely selectable. In order to be able to utilize the largest possible adjustment, it is advantageous to arrange the first deflection on the lift stand as far as possible, preferably above the longitudinal center of the Hubständers, more preferably above the lower 75% of the total length of the Hubständers or even better above the lower 85% of Total length of the lifting stand. It should not be ruled out that the deflection point is placed on the Hubständer, d. H. the first deflection point is provided outside and above the actual overall length of the lifting stand.

Likewise, it is advantageous to arrange the second deflection point as far as possible at the (first) lifting frame, preferably below the longitudinal center of the (first) lifting frame, more preferably below the upper 75% of the total length of the (first) lifting frame or even better below the upper 85%. the total length of the (first) lifting frame. It should also not be ruled out that the second deflection point is placed at the bottom of the (first) lifting frame, d. H. that it is located outside and below the actual longitudinal extent of the (first) lifting frame.

Furthermore, should be associated with the name of the respective component of the mast for attaching the deflection no restriction. The deflection point can therefore be arranged on any element of the designated component or on a rigidly connected to the designated component element, such as a carrier.

In order to likewise prevent the cable from lifting off or coming loose from the second and / or third deflection point, it is advantageous if the third deflection point is always located above the second deflection point.

Preferably, the movement part carrying the third deflection point is part of a piston-cylinder unit driving the driver's seat carrier relative to the second lifting frame for movement, more preferably the piston movable relative to a cylinder fixed on the second lifting frame. By means of the deflection determined by the movement relationship of the movement of a moving part, preferably a piston, the driver's seat carrier driving piston-cylinder unit for moving the driver's seat carrier can easily be calculated in advance, the required cable requirements and the cable is always kept taut during operation.

A compact, the field of view of a truck driver little impairing construction is obtained when the moving part of the fixed relative to a cylinder on the second lifting frame cylinder movable piston of the piston-cylinder unit, to which a power transmission deflection with at least one of the below in connection with a feature described power transmission means deflection means is provided. In this case, it is particularly advantageous if the cable deflection axis of the third cable deflection point to the deflection axis of the power transmission means deflection means is substantially parallel, preferably collinear. Due to the parallelism, it can be ensured that the cable is only subjected to tension during a movement of the piston, d. H. no shear forces occur. In a collinear arrangement, the cable deflection means and the power transmission means deflection means may for example be rotatably mounted on a common axis of rotation, which keeps the required number of components low.

Preferably, in order to limit the tension acting on the cable, strain relief is provided on at least one longitudinal end, preferably on both longitudinal ends of the cable. Furthermore, a further strain relief of the cable can be provided between two successive Kabelumlenkstellen to prevent excessive acting on the cable tensile stresses. This strain relief between two deflection is especially useful when using a flat cable, as this may need to be rotated between two deflection points around its longitudinal axis. An increase in the load imposed by the twisting of the cable due to tensile stress with simultaneous twist-fixing of the cable can be prevented or at least mitigated by this strain relief. Such a rotation of a flat cable may be necessary in particular between the second and the third deflection point.

The strain relief, for example, be designed constructively such that the cable is held ruffled between two connected by at least one tension spring clamping points. If a tensile stress then occurs on the cable, the cable section gathered between the clamping points is stretched against the force of the at least one spring, so that to a certain extent a stretching reserve for the cable is provided and a cable break can thus be prevented.

Particularly simple and gentle for the cable is provided at least one Kabelumlenkstelle, preferably at all Kabelumlenkstellen, a Kabelumlenkrolle. At this, the cable can roll off almost without slippage, so that during the deflection hardly any wear occurs.

The above with respect to electrical cables said essentially applies to hoses for fluid transport. Of particular interest in industrial trucks while hydraulic fluid conveying hoses.

For this reason, an advantageous development of the present invention, an inventive truck in which further on the second lifting frame a cylinder of a piston-cylinder unit is set and the movable relative to this movable piston movement transmitting with a second lifting frame relative to this substantially in Hubständerlängsrichtung guided driver station carrier is coupled, wherein a working fluid conveying flexible working fluid line between a truck frame fixed fluid delivery unit and the cylinder extends.

In such trucks, the field of view of the truck driver can be kept substantially free from the interference of the flexible working fluid line, if the working fluid line starting from its end of the truck frame solid up to a first line deflection on the Hubständer, from there down to a second line deflection point on the first Lifting frame and from there to the cylinder runs.

For a more detailed explanation of advantageous developments of the arrangement of the working fluid line is made to the above to the arrangement of the cable said, since the problems of hoses and cables, such as with respect to a prevention of detachment of deflection, a prevention of excessive tension, an array of deflection points, etc. , in essence, correspond. The above-described advantageous developments with respect to the cable can therefore be read by replacing the term "cable" by "working fluid line" as a further development for the arrangement of the working fluid line.

A particularly favorable in terms of the field of view, because the field of view hardly interfering arrangement of cable and working fluid line is obtained when the mast at least two mutually parallel substantially extending in mast longitudinal direction column assemblies, the cable in the region of a column assembly and the working fluid line in the range of another Column arrangement, preferably viewed from the truck driver from at least partially covered by the respective column arrangements, are arranged.

Of course, in a less preferred embodiment, only the cable or only the working fluid line viewed at least in sections from the truck driver, be arranged concealed by at least one column assembly of the mast.

An advantageous development of the present invention relates to an inventive truck with a load receiving means displaceably carrying load transfer means, wherein the truck as a drive for a displacement of the load receiving means comprises a piston-cylinder unit which comprises as components a retractable from a cylinder and retractable into these pistons , Wherein for the force transmission of a force from the piston-cylinder unit to a movable member of the load transfer means or on the load receiving means itself a flexible Provided power transmission means and the deflection of which at least one of the power transmission means about a deflection deflecting force transmission means deflection means with one of the components: piston and cylinder, is connected.

In general, a longitudinal end of the flexible power transmission means is fixed to the piston-cylinder unit supporting component of the truck, while the respective other longitudinal end of the flexible power transmission means is fixed to a relative to the piston-cylinder unit supporting member movable further component. Then, a relative movement of the piston and cylinder of the piston-cylinder unit leads to a depending on the type of deflection, about the amount of deflection, translated movement of the other component relative to the movement of the deflecting means supporting member of the piston-cylinder unit.

In the prior art here z. Example, a piston-cylinder unit, in which at the free longitudinal end of the piston rod, a so-called head piece is mounted, arranged by which deflection rollers for deflecting lamella chains in the longitudinal direction of the piston-cylinder unit of the piston-cylinder unit with distance are, wherein the known Kettenumlenkrollen are rotatable about an orthogonal to the piston-cylinder unit deflection axis. Such known assemblies of piston-cylinder unit and head piece therefore have a length extended by the diameter of the deflection rollers and a portion of their bearing means overall length, so that the piston-cylinder unit projects with the deflection rollers with greater probability in the field of view of a truck driver.

The development of the present invention described below aims to remove as far as possible flexible power transmission means and their deflection means from the driver's field of vision.

According to this development, the deflection means for a force transmission means for transmitting a force from the piston-cylinder unit to a movable component of the load displacement means is provided such that at least a portion of the deflection means is in the longitudinal extension region of the piston-cylinder unit to increase the driver's field of view. As a result, the total length of an assembly of piston-cylinder unit and deflection over the prior art is shortened so that it occupies less space and thus protrudes less deep into the driver's field of view with the same arrangement on the truck.

In the context of the present application, a section of the deflection means should be considered as lying in the longitudinal extension region when an imaginary radial beam orthogonal to the longitudinal axis of the piston-cylinder unit starts from the longitudinal axis both the piston or the cylinder of the piston-cylinder unit and the cylinder Passed through section of the deflection or at least touched. In other words, the piston-cylinder unit may be intended as a radially infinitely extended geometric cylinder, wherein according to the basic idea of the first aspect of the present invention, at least a portion of the deflection means projects into the imaginary cylinder.

It is to achieve the shortest possible overall length for an assembly of piston-cylinder unit and deflection advantageous if the largest possible portion of the deflection means in the longitudinal extension region of the piston-cylinder unit. Preferably, the entire deflection means is arranged in the longitudinal extension region of the piston-cylinder unit.

According to a preferred embodiment of the invention, the deflection can be arranged to achieve the shortest possible overall length of the assembly of piston-cylinder unit and the deflection such that in the direction of the piston-cylinder unit out extended imaginary deflection axis of the power transmission means deflection means the piston-cylinder unit crosses or cuts.

By "cutting" is meant that the piston-cylinder unit extended towards imaginary deflection axis penetrates a component of the piston-cylinder unit, such as the piston and / or the cylinder, or at least touched. By "crossing" it is meant that the deflecting axis, which has been extended to the piston-cylinder unit, passes the piston-cylinder unit at a distance orthogonal to the longitudinal axis of the piston-cylinder unit without penetrating the latter, a projection of which extends imaginary deflection axis in a projection direction orthogonal to the deflection axis and orthogonal to the longitudinal axis of the piston-cylinder unit, a projection of the piston-cylinder unit in the same projection direction intersects.

It is preferred that the at least one deflection means is provided such that the deflection axis is substantially orthogonal to the longitudinal axis of the piston-cylinder unit. Since the piston is movable relative to the cylinder along said longitudinal axis, it can be ensured by a deflection axis orthogonal to the longitudinal axis of the piston-cylinder unit that the flexible force transmission means can run parallel to the longitudinal axis of the piston-cylinder unit, so that one possible a large proportion of the force supplied by the piston-cylinder unit is transferable by the power transmission means as a pulling force on the associated with this movable component of the truck.

An easily assembled assembly of piston-cylinder unit and power transmission deflection means can be obtained by providing a head piece with holding means for supporting the power transmission means deflection means at the free longitudinal end of the piston protruding from the cylinder. It is ensured in orthogonal course of the deflection axis with respect to the longitudinal axis of the piston-cylinder unit that the deflection only slightly over the length of Piston-cylinder unit protrudes. If, for example, a chain deflection roller is used as the deflection means, in this arrangement the chain deflection roller protrudes at most with its half diameter in the longitudinal direction of the piston-cylinder unit over its entire length.

Particularly preferably, the deflection means is arranged such that the deflection axis is offset in the longitudinal direction of the piston-cylinder unit to the cylinder, so that only a very small part of the deflection extends beyond the free piston end or even more preferably the deflection completely within the longitudinal extent of Piston-cylinder unit is located. The latter provides a very short assembly of piston-cylinder unit and deflection or head piece ready.

For this purpose, in a constructive realization of this feature on the head piece, which may comprise a substantially planar mounting plate, deflecting means holders project parallel to the longitudinal axis of the piston-cylinder unit towards the side of the cylinder. Such Umlenkmittelhalterung can clamp the deflection axially on one side. For reasons of deformation rigidity and to avoid excessive bending moments in the holder, however, the deflection means is preferably held in the direction of the deflection axis at both axial ends, so that essentially tensile forces but no bending moments act on the holder of the deflection means.

In order to reduce the mechanical load of the flexible power transmission means and also the piston-cylinder unit, at least two power transmission means deflection means are provided on two opposite sides of the piston-cylinder unit. Preferably, the at least two deflection means are arranged symmetrically with respect to the longitudinal axis of the piston-cylinder unit, so that the bearing forces to be absorbed by the holders of the respective deflection means are substantially equal and equidistant from the longitudinal axis, so that the piston-cylinder unit is not or hardly subjected to bending by the bearing forces.

As already mentioned above, the power transmission means may be a chain, such as a lamella chain. Such chains can be almost slip-free lead in complementary gears trained. In such a case, the power transmission means deflection means may be a Kettenumlenkrolle, possibly with teeth, in which case the axis of rotation of the Kettenumlenkrolle represents the deflection axis of the chain. In principle, however, a use of ropes as a flexible power transmission means for transmitting a force from a drive to a driven component of the load transfer means is conceivable.

Fig. 1

eine konstruktive Ausgestaltung einer Kolben-Zylinder-Einheit mit Kopfstück und daran gelagerten Kettenumlenkrollen gemäß dem ersten Gesichtspunkt der vorliegenden Erfindung und

Fig. 2

ein erfindungsgemäßes Flurförderzeug, an welchem alle drei Gesichtspunkte der vorliegenden Erfindung verwirklicht sind.

The present invention will be explained in more detail below. It shows:

Fig. 1

a structural design of a piston-cylinder unit with head piece and mounted thereon Kettenumlenkrollen according to the first aspect of the present invention and

Fig. 2

an inventive truck, on which all three aspects of the present invention are realized.

In Fig. 1 is an assembly of a piston-cylinder unit and a deflection means for power transmission means generally designated 10. The assembly 10 is preferably provided on an industrial truck as a drive unit for a displacement of a movable component of a load transfer device. The assembly 10 comprises a piston-cylinder unit 12 with one at a in Fig. 2 illustrated lifting frame 62 fixed cylinder 14 and a longitudinal axis L of the piston-cylinder unit 12 relative to the cylinder 14 movable piston 16. The movability of the piston 16 is indicated by the extending in the longitudinal direction L double arrow V. At the free protruding from the cylinder 14 longitudinal end 16a of the piston, a generally designated 18 head piece is attached.

The headpiece 18 comprises a planar mounting plate 20 extending essentially orthogonal to the longitudinal axis L of the piston-cylinder unit 12, on which two holders 22 and 24 for chain deflection rollers 26 and 28 are arranged. The brackets 22 and 24 are symmetrical to a longitudinal axis L containing and orthogonal to the plane of Fig. 1 oriented plane of symmetry arranged on opposite sides of the piston-cylinder unit 12. Since the holders 22 and 24 do not differ, only the holder 22 will be described below, this description also being applicable to the holder 24.

The chain guide pulley mount bracket 26 includes two substantially parallel discs 30 and 32 spaced apart a distance slightly greater than the axial dimension of the chain guide roller 26 to be positioned between the discs 30 and 32. The substantially planar discs 30 and 32 are attached by welding, screwing, riveting and the like on a side facing toward the piston-cylinder unit 12 side 20 a of the mounting plate 20 and stand from this in each case substantially parallel to the longitudinal direction L of the piston-cylinder Unit 12 in the direction of the cylinder 14 down from.

Between the discs 30 and 32 extends a bolt 34, which rotatably supports the Kettenumlenkrolle 26. Likewise extends between the discs 36 and 38 of the holder 24, a bolt 40 which rotatably supports the Kettenumlenkrolle 28. Bolts 34 and 40 are substantially collinear, i. H. the longitudinal center axis M34 of the bolt 34 and the longitudinal center axis M40 of the bolt 40 lie substantially on a common straight line. The longitudinal center axes M34 and M40 of the bolts 34 and 40 also form the deflection axes for the chains (not shown), which are deflected about the respective chain rollers 26 and 28, and the axes of rotation of the respective chain deflection rollers 26 and 28.

Reference is also made to a likewise on the bolt 34 about its longitudinal central axis M34 rotatably mounted Kabelumlenkrolle 42, which is provided for deflecting a running between a control panel of a driver station carrier and a fixed to the frame of the truck control device extending cable. However, the Kabelumlenkrolle 42 may also be omitted.

In the cylinder 14 different seals, guides and ventilation grooves are shown in dashed lines, which are not of interest for the present invention and will therefore not be further described.

The piston 16 ends at its free longitudinal end 16 a flush with the surface 20 b of the mounting plate 20, so that in Fig. 1 It can easily be seen that the Kettenumlenkrollen 26 and 28 are arranged completely within the longitudinal extension region E of the piston-cylinder unit 12.

With G is in Fig. 1 an imaginary extension of the deflection axis M34 to the piston-cylinder unit 12 out. Since the deflection axes M34 and M40 are substantially collinear, the straight section G also denotes an extension of the deflection axis M40 of the deflection roller 28 Piston-cylinder unit 12 out. At the in Fig. 1 the embodiment shown cuts, ie interspersed, the extension G of the deflection axes M34 and M40, the piston-cylinder unit 12. Are the pulleys in an alternative, in Fig. 1 not shown embodiment orthogonal to the plane of the Fig. 1 offset such that the extension G of the deflection axes, although the piston-cylinder unit 12 no longer intersects, but a projection of the extension G both orthogonal to the longitudinal axis L of the piston-cylinder unit 12 and orthogonal to the respective deflection axis M34 and / or M40 intersects a projection of the piston-cylinder unit 12 in the same projection direction, this is understood in the sense of the present application as crossing the piston / cylinder unit 12. An arrangement with such a crossing deflection axis is in terms of achievable shortening of an assembly of piston-cylinder unit 12 and pulleys 26 and 28 in the same way advantageous as an arrangement with cutting deflection.

In Fig. 2 is an inventive material handling vehicle, which realizes all three aspects of the present invention, generally designated 50. In the Fig. 1 designated components are in Fig. 2 denoted by the same reference numerals.

The truck 50 has a wheels 52 and 54 movable on a substrate U truck body 56, which is constructed on a truck frame, not shown. In the truck body 56 are, inter alia, the drive unit for driving the truck 50, a hydraulic fluid reservoir, a hydraulic pump, a control device for controlling the truck drive and the hydraulic drive, a steering drive, which can also be controlled by a control device, and the like.

On the truck 50, a mast 58 is mounted, which has a truck frame fixed lifting stand 60, one on the Hubständer 60 in Direction of the double arrow V relative to this movably guided first lifting frame 62 and on the first lifting frame 62 also in the direction of the double arrow V relative to this movable second lifting frame 64 includes. The first lifting frame 62 and the second lifting frame 64 are driven by not shown hydraulic piston-cylinder units for relative movement against each other. The hydraulic piston-cylinder units are designed such that the second lifting frame 64 always covers the double actuating travel as the first lifting frame 62 with respect to the truck frame fixed lifting stand 60 in a lifting operation.

The previously described piston-cylinder unit 12 is fixed to the cylinder 14 on the second lifting frame 64. On the second lifting frame 64 is in turn in the direction of the double arrow V in Fig. 2 not shown, in the direction of the Fig. 2 located in front of the mast 58 located driver seat carrier relative to this movable. The piston-cylinder unit 12 forms the drive of the driver's seat carrier. For this purpose, lamellae chains, not shown, are firmly connected with their one longitudinal end to the second lifting frame 64 and with their respective other longitudinal end to the driver's seat carrier, wherein the extending between the longitudinal ends of the guide section is guided around the pulleys 26 and 28. One pulley is used for each pulley. Due to the self-weight of the driver's seat carrier, the chain is always taut.

By extending the piston 16 out of the cylinder 14, the driver's station carrier can be raised and lowered accordingly by retracting the piston, the distance traveled by the driver's seat carrier being always twice the distance covered by the piston 16 due to the described chain ratio.

The main traversing direction of the industrial truck 50 is indicated by an arrow HV in FIG Fig. 2 characterized. It corresponds to the viewing direction of the viewer orthogonal to the plane of the drawing Fig. 2 , As in Fig. 2 it can be seen For example, the truck 50 has a particularly large field of view SB, which is limited to the right and left and up through the second lifting frame 64 and down substantially through the head piece 18. This viewing area SB is essentially free of power transmission means, deflecting means, cables and hoses, so that the driver can see in the main traversing direction HV as far as possible.

A flat cable 66, which extends between the truck body 56 and the driver's seat carrier, not shown, exits at a point 68 from the truck body 56, for example, from a connector plugged into a corresponding socket on the truck.

Near the exit point 68, the cable 66 is provided in a conventional manner with a strain relief 70. For this purpose, the cable is clamped with two terminals 72 and 74, wherein the two terminals 62 and 74 are connected to tension springs 76. The clamped between the terminals 72 and 74 cable length of the cable 66 is longer than the tension springs 76 in the relaxed state. As a result, the cable 76 can be stressed against the force of the springs 76 with tensile force without the risk of cable breakage.

From the outlet 68 from the truck body 56, the cable 66 extends up to a first Kabelumlenkrolle 78, which is arranged on the lifting frame 60. The arrangement can take place at a suitable location of the lifting frame. In the present case, the cable deflection roller 78 is arranged on a column arrangement 60 a of the lifting stand 60.

As indicated by dashed lines, the cable 66 is located behind the mast 58 by the driver on the driver's seat carrier, so that it is concealed by the latter and does not impair the driver's view.

From the first cable deflection roller 78, the cable 66 is deflected by almost 180 ° down to a second cable deflection roller 80 which is arranged rotatably about an axis 82 on the first lifting frame 62. The second cable deflection roller 80, like the first cable deflection roller 78, can be arranged on a column arrangement 62 a of the first lifting frame 62. In the example shown, however, the second deflection roller is connected to a transverse strut 62b of the first lifting frame.

From the second Kabelumlenkrolle 80 of the cable runs after a deflection by another approximately 180 ° again upwards, the ribbon cable to approach the third Kabelumlenkrolle 42, which already in connection with Fig. 1 has been described, is rotated about 90 ° about its longitudinal axis. This rotation is fixed by means of a further strain relief device 84, which essentially corresponds to the strain relief device 70. In doing so, the in Fig. 2 lower terminal of the strain relief 84 attached to a cross member 64b of the second lifting frame 64, so that the 90 ° rotation of the ribbon cable is ensured. Alternatively, one can use a cable with a round, in particular circular cross-section. Then the mechanical securing of the rotation by 90 ° would not be necessary, so that the second strain relief 84 does not need to be provided.

From the second strain relief 84 from the cable 66 continues upwards, and is again deflected at the third Kabelumlenkrolle 42 by approximately 180 °. The cable feed to the roller 42 is in Fig. 2 behind the roller rotation axis M34, the cable run from the roller 42 in front of it.

The axes of rotation of the first two Kabelumlenkrollen 78 and 80 are in Fig. 2 essentially parallel to one another and parallel to the plane of the drawing Fig. 2 shown. Although this is not absolutely necessary, in the use of ribbon cables to avoid unnecessary twisting of the cable about its longitudinal axis, a use of angular not to very divergent deflection axes advisable.

The said in connection with the cable 66 also applies to a hydraulic hose 86, which exits on the other side of the truck body 56 relative to a longitudinal center plane of the truck 50. After its exit from the truck body 56 of the hydraulic hose 86 extends up to a first Schlauchumlenkrolle 88. At this Schlauchumlenkrolle 88 of the hydraulic hose 86 is deflected by about 180 ° and then runs down to a second Schlauchumlenkrolle 90, from where he after another redirection 180 ° upward to a hydraulic oil port 92 of the hydraulic cylinder 14 of the piston-cylinder unit 12 extends.

In the dashed line of the hydraulic hose 86, this is hidden by the column arrangements 60c, 62c and 64c of the mast 58 as viewed by the driver on the driver's seat carrier, so that he does not disturb his view.

Again, the axes of rotation of the hose pulleys 88 and 90 are shown substantially in parallel. This is to avoid an unnecessary load on the hydraulic hose 86 advantageous, but less necessary than a flat cable 66, since hydraulic hoses usually have circular cross-sections.

Since the driver's seat carrier can only be moved along the second lifting frame 64, it is easy to see that a deflection of cables and hoses carried out in a lower region of the first lifting frame 62 always lies below the driver's seat carrier and thus always outside the field of vision of the driver. The driver thus has a comparatively clear view in the main travel direction HV.

Claims (16)

1. Industrial truck having a lifting mast (58) which bears a load-accommodating means such that it can be displaced and comprises a lifting stand (60) fixed to the industrial truck frame and at least one lifting frame (62, 64) which is guided on the lifting stand (60) and can be displaced in relation to said lifting stand in the longitudinal direction (V) thereof, a cable (66) for the purpose of transmitting control signals running between a control unit fixed to the industrial truck frame and an operating unit which is provided on a driver's platform which is guided on the lifting frame (62, 64) such that it can move in relation to said lifting frame (62, 64), characterized in that the cable (66), starting from its end (68) fixed to the industrial truck frame, runs upwards to a first cable deflection point (78) on the lifting stand (60), from there downwards to a second cable deflection point (80) on the lifting frame (62) and from there upwards to the driver's platform.
2. Industrial truck having a lifting mast (58) which bears a load-accommodating means such that it can be displaced and comprises a lifting stand (60) fixed to the industrial truck frame, a first lifting frame (62) which is guided on the lifting stand (60) and can be displaced in relation to said lifting stand (60) in the longitudinal direction (V) thereof, and a second lifting frame (64) which is guided on the first lifting frame (62) in relation to said first lifting frame (62) so as to move substantially in the longitudinal direction (V) of the lifting stand, a cable (66) for the purpose of transmitting control signals running between a control unit fixed to the industrial truck frame and an operating unit which is provided on a driver's platform which is guided on the second lifting frame (64) such that it can move in relation to said second lifting frame (64) substantially in the longitudinal direction (V) of the lifting stand, characterized in that the cable (66), starting from its end (at 68) fixed to the industrial truck frame, runs upwards to a first cable deflection point (78) on the lifting stand (60), from there downwards to a second cable deflection point (80) on the first lifting frame (62) and from there upwards to a third deflection point (42) on a movement part (16) which moves in a fixed movement relationship with respect to the driver's platform and from there to the driver's platform.
3. Industrial truck according to Claim 1 or 2, characterized in that the first deflection point (78) and the second deflection point (80) are provided such that the first deflection point (78) is positioned above the second deflection point (80) when the lifting frame (62, 64) has been extended completely in relation to the lifting stand (60).
4. Industrial truck according to Claim 2, possibly incorporating Claim 3, characterized in that the third deflection point (42) is always positioned above the second deflection point (80).
5. Industrial truck according to Claim 2, possibly incorporating Claim 3 or 4, characterized in that the movement part (16) is part of a piston/cylinder unit (12), which drives the driver's platform to move in relation to the second lifting frame (64), preferably the piston (16), which can move in relation to a cylinder (14) fixed on the second lifting frame (64), of the piston/cylinder unit (12).
6. Industrial truck according to one of Claims 1 to 5, characterized in that a tensile strain-relief device (84) for the cable (66) is provided between two successive cable deflection points (80, 42), preferably between the second cable deflection point (80) and the third cable deflection point (42), in particular when the cable (66) is a flat cable.
7. Industrial truck according to one of Claims 1 to 6, characterized in that a cable deflection roller (78, 80, 42) is provided at at least one, preferably at all, of the cable deflection points (78, 80, 42).
8. Industrial truck according to one of Claims 1 to 7, characterized in that it comprises a load displacement means (58) bearing the load-accommodating means such that it can be displaced, the industrial truck having, as the drive for displacing the load-accommodating means, a piston/cylinder unit (12) which comprises as components a piston (16) which can be extended out of a cylinder (14) and withdrawn into this cylinder, a flexible force transmission means being provided for the purpose of transmitting a force from the piston/cylinder unit (12) to a moveable component (62, 64) of the load displacement means (58) or to the load-accommodating means itself and, for the purpose of deflecting said force transmission means, at least one deflection means (26, 28) for the force transmission means which deflects the force transmission means about a deflection axis (M34, M40) being connected to one of the components: piston and cylinder, at least one section of the deflection means (26, 28), preferably the entire deflection means (26, 28), lying in the region of longitudinal extent (E) of the piston/cylinder unit (12).
9. Industrial truck according to Claim 8, characterized in that the deflection means (26, 28) for the force transmission means is provided such that the imaginary deflection axis (M34, M40), extended in the direction towards the piston/cylinder unit (12), of the deflection means (26, 28) for the force transmission means crosses or intersects the piston/cylinder unit (12).
10. Industrial truck according to Claim 8 or 9, characterized in that the deflection axis (M34, M40) of the deflection means (26, 28) for the force transmission means runs substantially orthogonally with respect to the longitudinal axis (L) of the piston/cylinder unit (12).
11. Industrial truck according to one of Claims 8 to 10, characterized in that a head piece (18) having a holding means (22, 24) for the purpose of holding the deflection means (26, 28) for the force transmission means is provided at that free longitudinal end (16a) of the piston (16) which protrudes from the cylinder (14), said holding means (22, 24) preferably protruding substantially parallel to the longitudinal axis (L) of the piston/cylinder unit (12) towards the cylinder (14).
12. Industrial truck according to one of Claims 8 to 11, characterized in that at least two deflection means (26, 28) for the force transmission means are provided on two opposing sides of the piston/cylinder unit (12).
13. Industrial truck according to one of Claims 8 to 12, characterized in that the force transmission means is a chain, for example a slat chain, and the deflection means (26, 28) for the force transmission means is a chain deflection roller (26, 28), in this case the axis of rotation of the chain deflection roller being the deflection axis (M34, M40).
14. Industrial truck according to one of Claims 5 to 7, incorporating one of Claims 8 to 13, characterized in that the movement part (16) is the piston (16), which can move in relation to a cylinder (14) fixed on the second lifting frame (64), of the piston/cylinder unit (12), the deflection means (26, 28) for the force transmission means being provided on said movement part (16), and a cable deflection axis (M34) of the third cable deflection point (42) being substantially parallel to, preferably substantially colinear with respect to, the deflection axis (M34, M40) of the deflection means (26, 28) for the force transmission means.
15. Industrial truck according to Claim 2, possibly incorporating one of Claims 3 to 14, characterized in that a cylinder (14) of a piston/cylinder unit (12) is further fixed on the second lifting frame (64), and the piston (16) which can move in relation to said cylinder (14) is coupled so as to provide motion transfer to the driver's platform which is guided on the second lifting frame (64) such that it can move in relation to said second lifting frame (64) substantially in the longitudinal direction (V) of the lifting stand, a flexible working fluid line (86) conveying working fluid running between a fluid conveying unit fixed to the industrial truck frame and the cylinder (14), and the working fluid line (86), starting from its end fixed to the industrial truck frame, running upwards to a first line deflection point (88) on the lifting stand (60), from there downwards to a second line deflection point (90) on the first lifting frame (62) and from there to the cylinder (14).
16. Industrial truck according to Claim 15, characterized in that the lifting mast (58) comprises in each case at least two column arrangements (60a, 62a, 64a; 60c, 62c, 64c) running parallel to one another substantially in the longitudinal direction (V) of the lifting mast, the cable (66) being arranged in the region of a column arrangement (60a, 62a, 64a) and the working fluid line (86) in the region of another column arrangement (60c, 62c, 64c), preferably hidden at least in sections by the respective column arrangements (60a, 62a, 64a; 60c, 62c, 64c), when viewed by the industrial truck driver.

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