DE20020658U1 - Roller board - Google Patents

Description

Description: G OO 128

Wolfgang Wallau 53639 Koenigswinter

Skateboard

The invention relates to a skateboard with a footboard serving as a standing surface, at the front end of which a front wheel is arranged on each side of the longitudinal axis of the same and at the rear end of which at least one rear wheel is arranged, wherein the front wheels are mounted on separate wheel axles on steering knuckles and the steering knuckles are pivotably mounted at one of their ends about respective pivot axes and are connected to one another at their other end via a tie rod, so that the front wheels can be pivoted in parallel about its longitudinal axis when the footboard is tilted.

Such roller boards of the type mentioned above are known as sports and leisure equipment and are described, for example, in WO 00/03773 A1. Due to the combination of two front wheels and one rear wheel, these roller boards are characterized by good directional stability, whereby a steering knuckle with swivel axes running at an angle to the vertical and a connection of the steering knuckles via a tie rod is provided, which ensures that the known roller boards can be easily steered by means of weight shifting, in that the footboard is tilted about its longitudinal axis and the front wheels can be pivoted parallel to produce a steering deflection.

However, the directional stability and steering of the known designs leave much to be desired, particularly at the high speeds that can be achieved with the roller boards, since the steerable front wheels are pivoted around their longitudinal axis to generate a steering angle even with the slightest tilting movement of the running board, and the steering mechanism experiences undesirable elastic deformations, which is detrimental to steering precision. In addition, the compulsory arrangement of the pivot axes of the steering knuckle at an angle that runs obliquely to the vertical necessarily means that the front wheels are inclined to their lateral peripheral edges when a steering angle is applied, which causes high bearing loads and high abrasion and wear on the wheels.

The invention has set itself the task of further developing a skateboard of the type mentioned at the outset in such a way that its steering precision is increased in order to ensure, in particular, improved controllability and smoother running even at high speeds and, on the other hand, to reduce wear and tear despite a simple design of the steering mechanism.

on the bearings and wheels.
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This object is achieved according to the invention by designing a skateboard according to the features of claim 1.

Advantageous embodiments and further developments of the invention are the subject of the subclaims.

To achieve the above-described object, the invention proposes that a steering plate is provided which is mounted at the front end of the footboard so as to be pivotable relative to the footboard about a pivot axis running in the direction of travel of the roller board, and the steering knuckles of the front wheels are pivotably attached to the steering plate about their pivot axes, and the footboard has a control element which is operatively connected to the tie rod.

by means of which a relative pivoting movement between the running board and the steering plate as a result of tilting of the running board about its longitudinal axis can be transferred into a longitudinal displacement of the tie rod transverse to the longitudinal axis of the running board.
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Due to its ability to pivot relative to the steering plate, the running board can be easily tilted around its longitudinal axis by shifting weight, whereby tilting the running board via the control element produces a longitudinal displacement of the tie rod transverse to the longitudinal axis of the running board, as a result of which the front wheels are forced to receive the desired steering deflection, so that the roller board according to the invention can be easily controlled by shifting weight.

The control element can, for example, be a control pin attached to the running board and protruding beyond it in the direction of travel, which is guided in a vertically extending elongated hole on the tie rod.

By means of such a control pin, the tilting movements of the running board about its longitudinal axis can be easily converted into longitudinal displacement of the tie rod and corresponding steering deflections of the front wheels.

The elongated hole intended to accommodate the control pin can be formed directly in the tie rod if the tie rod has sufficient cross-sectional dimensions. However, it is also possible for the tie rod to have a control housing in which the elongated hole is formed to accommodate the control pin. Such a control housing can be attached to the tie rod at a suitable location.

The steering plate is advantageously pivotally mounted around a pivot pin attached to the footboard, whereby the pivot pin defines the pivot axis. By appropriately dimensioning such a pivot pin, an extremely stable pivoting linkage of the steering plate to the footboard is achieved.

Preferably, the pivot axis, the longitudinal axis of the footboard and the axis of the control pin are brought together on a common line in the vertical projection and the pivot axis is at a certain distance from the axis of the control pin. This distance has a significant influence on the controllability of the skateboard designed according to the invention.

The greater the vertical distance between the control pin and the pivot pin, the greater the longitudinal displacement of the tie rod and thus the steering deflections achieved when the footboard is tilted by a certain angle along its longitudinal axis. The expert can optimize the roller board according to the invention for the desired purpose by achieving a very spontaneous steering movement with a very large distance between the pivot pin and the control pin, but as the distance becomes smaller, larger tilting movements of the footboard are necessary to achieve a certain steering deflection, which overall leads to a more stable straight-ahead travel of the roller board according to the invention, particularly on uneven ground and/or at high driving speeds.

A compact design of the skateboard according to the invention can be ensured by the fact that the steering knuckles are pivotably mounted about their pivot axes on bearing pins that extend out from the underside of the steering plate.

Furthermore, the pivot axes of the steering knuckles are advantageously arranged in front of the wheel axles of the front wheels when viewed in the direction of travel of the skateboard and the tie rod engages the steering knuckles behind the wheel axles when viewed in the direction of travel of the skateboard.

In particular, it is possible with the roller board according to the invention for the pivot axes of the steering plate to be arranged horizontally and the pivot axes of the steering knuckles to be arranged vertically, preferably at right angles to the pivot axis. Due to this configuration, it is possible.

To generate steering deflections of the front wheels without these having to be tilted over one of their outer edges when turned, but they always rest with the full tread on the ground, which leads to a particularly good steering result and low wear of the bearings and wheels of the skateboard according to the invention.

To assist in controlling the roller board according to the invention by shifting weight and tilting the footboard around its longitudinal axis, a joint is advantageously provided on the footboard in the area of the front end, which joint comprises a fixed bearing part and a pivoting part. The fixed bearing part is firmly connected to the footboard and the pivoting part is connected to a handlebar, which can be folded and locked by means of the joint from a position running essentially parallel to the footboard, which is very space-saving, into an upright position and vice versa. In the upright position, the handlebar enables the footboard to be tilted around its longitudinal axis with little effort, as is necessary to achieve the steering deflections.

Furthermore, the pivot pin for the steering plate is advantageously held in the fixed bearing part of the joint and inserted into the steering plate with a free end protruding in the direction of travel.

According to an advantageous embodiment of the skateboard according to the invention, it is provided that it has an unsteered rear wheel, ie one that follows the front wheels. This rear wheel is preferably arranged in a substantially U-shaped rear wheel holder, which is attached to the rear end of the footboard and is additionally equipped with a braking device.
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This braking device can, for example, comprise a brake shoe which can be pressed against the circumference of the rear wheel and which, with the interposition of an elastic

compressible return element, for example made of a suitable elastomeric plastic, is attached to the rear wheel mount.

According to another advantageous embodiment of the skateboard according to the invention, it can also be provided that it has two steerable front wheels and two rear wheels. These rear wheels can either be unsteered, i.e. they follow the front wheels, or they can also be provided with a steering option and are preferably arranged mirror-symmetrically to the longitudinal axis of the running board.

In particular, according to the invention, the rear wheels are attached to the running board of the skateboard via a mechanism which essentially corresponds to that of the steerable front wheels, so that the rear wheels can also be pivoted in parallel when the running board is tilted to produce corresponding steering angles. By aligning the elements in a way that is exactly opposite to the arrangement on the front wheels, an opposite steering angle can be achieved, so that when the running board is tilted, the front wheels and the rear wheels are each pivoted parallel and by the same amount, but in the opposite direction, which means that very tight curve radii can be negotiated with the skateboard according to the invention. The structure of the steering mechanism for the rear wheels essentially corresponds to that of the front wheels and is the subject of claims 14 to 24.

Furthermore, the roller board according to the invention is provided with the front and rear wheels having a cylindrical running surface and in particular having widths of at least 35 mm, preferably 40 mm, which ensures good load-bearing capacity, good straight-line running and insensitivity to uneven ground even at high speeds, so that the roller board according to the invention can also be driven well on less paved terrain.

Of course, other wheel dimensions - larger or smaller - can also be provided for the skateboard according to the invention.

Further details of the invention are explained in more detail below using exemplary embodiments in the drawings. They show:

Figure 1 shows the view of the underside of a first embodiment of a

inventive roller board,

Figures 2a and 2b side views of the roller board according to the invention

according to Figure 1,

Figures 3a and 3b schematically show the generation of a steering deflection at the

inventive roller board according to Figure 1,
15

Figure 4 shows the side view of another embodiment of the inventive

appropriate skateboard,

Figure 5 shows the view of the underside of the roller board according to the invention

according to Figure 4.

Figures 1, 2a and 2b show a skateboard whose main direction of travel is shown by arrow F. It comprises a footboard 1 serving as a standing surface, to whose front end 10, as seen in the direction of travel F, a wheel set 2 with two steerable front wheels 25a, 25b is attached and to whose rear end 11 a non-steerable and merely trailing rear wheel 3 is attached.

In the area of the front end 10 of the running board 1, a joint 6 is arranged on the upper side, which has a fixed bearing part 60 and a pivoting part 61.

A connecting piece 62 is formed on the swivel part 61, which is used to attach a

Handlebar 5 is formed from two tubes 50, 51 which can be pushed into one another and secured against one another and has a hand knob 52 forming the upper end.

The fixed bearing part 60 has two recesses 603, 604 arranged at an angle of approximately 90° to one another, into which a locking bolt 610 protruding beyond the pivoting part 61 can be inserted. Furthermore, both the fixed bearing part 60 and the pivoting part 61 are penetrated by a bolt 601 which is guided within an elongated hole 612 in the pivoting part 61.

It is therefore possible to lock the handlebar 5 in the position shown in Figures 2a and 2b by engaging the bolt 610 in the recess 603 in a space-saving position extending substantially parallel to the footboard 1 or to raise the handlebar 5 in the direction of arrow P by disengaging the bolt 610 from the recess 603 and then to lock the bolt 610 in the recess 604, which corresponds to a driving position.

As already mentioned, the front wheels 25a, 25b of the skateboard are designed to be steerable. This is made possible by a construction explained in more detail below.

The common support and fastening element for the two front wheels 25a, 25b is a steering plate 23, which is arranged in front of the footboard 1 when viewed in the direction of travel F. For this purpose, a pivot pin 605 is provided through the fixed bearing part 60 of the joint, which defines a pivot axis L and is inserted with its free end pointing in the direction of travel F into a corresponding hole in the steering plate 23. Due to this design, the steering plate 23 is attached to the footboard 1 so as to be pivotable relative to the footboard about the pivot axis L, which is defined by the pivot pin 605 and points in the direction of travel F of the skateboard.

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From the illustration in Figure 1 it can also be seen that the pivot axis L in the vertical projection coincides with the longitudinal axis M of the running board 1 and that the entire skateboard is constructed mirror-symmetrically to the longitudinal axis M.
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At the front end of the steering plate 23, as seen in the direction of travel F, bearing bolts 201 are arranged by means of nuts 202, which extend in the vertical direction and are led out of the underside of the steering plate 23. These bearing bolts 201 define pivot axes S1, S2 for a respective steering knuckle 21a or 21b assigned to a front wheel 25a, 25b, which is pivotably mounted about the bearing bolt 201 with its front end lying in the direction of travel F.

The two steering knuckles 21a, 21b extend approximately parallel to the direction of travel F and to the longitudinal axis M of the skateboard. At their two rear ends, i.e. those facing away from the bearing bolts 201, the steering knuckles 21a, 21b are connected to one another via a tie rod 22 extending transversely to the longitudinal axis M in the manner of a parallelogram steering.

This is done by means of screws 212 which are screwed through the tie rod 22 into the steering knuckles 21a, 21b.

Between the point of application of the tie rod and the front end of the steering knuckles 21a, 21b, which receives the bearing bolts 201, each of these steering knuckles 21a, 21b carries a wheel axle 24a, 24b, on which the front wheels 25a, 25b are ultimately rotatably mounted.

It is therefore obvious that, via the forced coupling of the steering knuckles 21a, 21b by means of the tie rod 22, the two front wheels 25a, 25b can be pivoted parallel and by the same amount about the pivot axes S1, S2 in order to achieve a steering deflection.

In order to achieve this pivoting of the front wheels 25a, 25b as a result of the weight shift of a person standing on the footboard 1.

a base plate 20 is provided on the underside of the running board 1 in the area of the front end 10, from which a control element in the form of a control bolt 221 protruding in the direction of travel F is led out. This control bolt 221 is operatively connected to the tie rod 22 in that it is guided in a control housing 222 arranged centrally on the tie rod 22 in a vertical slot 220 formed therein; see the view opposite arrow F in Figure 3a. The axis ST of the control bolt also lies in the vertical projection on a common line with the pivot axis L and the longitudinal axis M of the running board 1. If, as shown schematically in Figure 3b, a weight shift is carried out on the running board 1 in such a way that it is tilted about its longitudinal axis M, the steering plate 23 which can be pivoted about the pivot bolt 605 relative to the running board 1 remains in its unchanged position, whereas the pivoting of the running board 1 by an angle marked with reference number α in Figure 3b causes a longitudinal displacement of the tie rod 22 in the direction of the arrow PS transverse to the longitudinal axis M of the running board 1, since the control bolt 221 is rigidly attached to the running board 1 and is operatively connected to the control housing 222 of the tie rod 22.

By this displacement of the tie rod 22 in the direction of the arrow PS, the steering knuckles 21a, 21b are pivoted parallel about their pivot axes S1, S2, whereby the steering deflection of the front wheels 25a, 25b shown schematically in Figure 3b is established as a result of the tilting of the running board 1.

It is therefore possible to control the skateboard according to the invention by means of weight shifting, which causes the footboard 1 to tilt about its longitudinal axis M, since this causes corresponding steering deflections of the front wheels 25a, 25b.

The distance A between the pivot axis L and the axis ST of the control pin 221 has a significant influence on the steering response of the front wheels 25a, 25b as a result of the tilting movement of the running board 1. The larger the

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The greater the distance A between these two axes L, ST, the greater the steering deflections become by moving the tie rod 22 in the direction of the arrow PS at a given tilt angle α, i.e. even small tilting movements are sufficient to generate steering deflections, which leads to spontaneous steering behavior.

Conversely, a small distance A between the axes L, ST means that larger tilt angles α of the running board 1 are required in order to produce a certain steering deflection of the front wheels 25a, 25b, so that a roller board designed in this way is better suited for higher speeds and/or uneven surfaces, since it reacts much more slowly with regard to steering movements to a tilting of the running board 1.

It can also be seen from the illustrations according to Figures 1, 3a and 3b that the pivot axis L of the steering plate 23 runs horizontally in the direction of travel F, while the pivot axes S1, S2 run vertically at a right angle to the pivot axis L. Due to this axle arrangement, both when the skateboard travels straight ahead according to Figure 3a and when cornering with pivoted front wheels 25a, 25b according to Figure 3b, the front wheels 25a, 25b always roll on the ground with their entire circumferential surface, which minimizes wheel and bearing wear and also serves to ensure running precision.

At the rear end 11 of the footboard 1, the rear wheel 3 is held in a U-shaped rear wheel holder 30, which is attached to the underside of the footboard 1 by means of fastening screws 34. In this U-shaped rear wheel holder 30, a receiving space 300 for the rear wheel 3 is provided and the wheel axle 32 for the rear wheel 3 is held in the rear wheel holder 30.

It can also be seen from the illustrations according to Figures 2a and 2b that the rear wheel 3 can also be designed with a braking device in the form of a brake shoe 40 which can be elastically applied to the circumference of the rear wheel 3,

which is also fastened to the rear wheel mount 30 by means of a fastening screw 42 with the interposition of an elastic return element 41, for example made of an elastomeric plastic.

Figures 4 and 5 show a modified embodiment of the skateboard compared to the previously explained embodiment, wherein the entire suspension of the front wheels 25a, 25b together with the already explained steering mechanism and the fastening of the handlebar 5 are identical to the previously designed embodiment.

However, as can be seen in particular from the illustration in Figure 5, this skateboard, in contrast to the previously explained skateboard in Figures 1 and 2a, 2b, has two rear wheels, which are identified by reference numerals 75a, 75b and are also designed to be steerable. This is achieved by a suspension of the rear wheels 75a, 75b which is designed essentially the same as the suspension of the front wheels 25a, 25b.

A pivot pin 606, which defines a pivot axis H, is fastened in a housing 64 on the top of the running board 1 in the area of its rear end 11. The pivot pin 606 protrudes against the direction of travel F and is inserted into a steering plate 73, which is pivotably mounted about the pivot axis H relative to the running board 1. Two bearing pins 701 protrude from the underside of the steering plate 73, which serve to pivotally mount a steering knuckle 71a, 71b about pivot axes S3, S4. The steering knuckles 71a, 71b each carry a wheel axle 74a, 74b for the rear wheels 75a, 75b in front of the bearing pins 701 as seen in the direction of travel F.

Viewed in the direction of travel F in front of the wheel axles 74a, 74b, the steering knuckles 71a, 71b are in turn connected to one another by a tie rod 72 which extends transversely to the longitudinal axis μ of the running board 1, for which purpose screws 712 are provided. Furthermore, a control bolt 721 is provided in a

base plate 70 attached to the underside of the running board 1 and is operatively connected to the tie rod 72 via a corresponding control housing 722 with an elongated hole not shown in detail.

Overall, this results in a substantially identical structure for the steering of the rear wheels 75a, 75b compared to the suspension of the front wheels, which is designed symmetrically to an imaginary central axis C of the skateboard, i.e. it is exactly the opposite in relation to the direction of travel F. In particular, the pivot axes H and L lie on a common line and the distance between the pivot pin 606 and the control pin 721 also corresponds to the distance A on the front wheel suspension 2.

This design makes it possible, according to the same operating principle already explained with reference to Figures 3a and 3b, to ensure that not only the front wheels 25a, 25b are pivoted when the running board 1 is tilted to produce a steering angle, but also the rear wheels 75a, 75b are pivoted in the same way, but in the opposite direction to the front wheels 25a, 25b, so that an opposite steering angle is produced, which is, however, of the same size, so that very tight curve radii can be driven with such a roller board with stability even at high speeds.

It is essential for the steering mechanisms on the front wheels 25a, 25b and possibly also on the rear wheels 75a, 75b that these wheels always roll on the ground with their full circumferential surface both in the straight-ahead driving position according to Figures 1 and 5 and when the steering is turned as a result of the running board 1 tipping over, which considerably minimizes the wear of the running surfaces and at the same time benefits increased steering precision.

Furthermore, by designing all wheels 25a, 25b, 3 and 75a, 75b with cylindrical treads and a width of 35 to 40 mm or more, a

High driving stability is achieved even on uneven surfaces such as cobblestones, asphalt, gravel or unpaved terrain and sinking into soft ground is largely eliminated.

Claims (26)

1. Roller board with a footboard serving as a standing surface, at the front end of which a front wheel is arranged on each side of the longitudinal axis of the same and at the rear end of which at least one rear wheel is arranged, wherein the front wheels are mounted on separate wheel axles on steering knuckles and the steering knuckles are pivotably mounted at one of their ends about respective pivot axes and are connected to one another at their other end via a tie rod, so that the front wheels can pivot in parallel about its longitudinal axis when the footboard is tilted, characterized in that a steering plate (23) is provided which is pivotably mounted at the front end of the footboard (1) about a pivot axis (L) running in the direction of travel (F) of the roller board relative to the footboard (1), and the steering knuckles (21a, 21b) of the front wheels (25a, 25b) are pivotably attached to the steering plate (23) about their pivot axes (S1, S2), and the footboard (1) has a Tie rod (22) has a control element which is operatively connected and by means of which a relative pivoting movement between the running board (1) and the steering plate (23) as a result of tilting of the running board about its longitudinal axis (M) can be transferred into a longitudinal displacement of the tie rod (22) transversely to the longitudinal axis (M) of the running board (1). 2. Skateboard according to claim 1, characterized in that the control element is a control pin (221) which is fastened to the footboard (1) and projects beyond it in the direction of travel (F) and is guided in a vertically extending elongated hole (220) in the tie rod (22). 3. Skateboard according to claim 2, characterized in that the tie rod (22) has a control housing (222) in which the elongated hole (220) is formed for receiving the control pin (221). 4. Roller board according to one of claims 1 to 3, characterized in that the steering plate (23) is pivotally mounted about a pivot pin (605) fastened to the footboard (1) which defines the pivot axis (L). 5. Skateboard according to one of claims 1 to 4, characterized in that the pivot axis (L), the longitudinal axis (M) of the footboard (1) and the axis (ST) of the control pin (221) coincide in the vertical position and the pivot axis (L) is at a distance (A) from the axis (ST). 6. Skateboard according to one of claims 1 to 5, characterized in that it is designed to be mirror-symmetrical to the longitudinal axis (M) of the footboard (1). 7. Skateboard according to one of claims 1 to 6, characterized in that the steering knuckles (21a, 21b) of the front wheels (25a, 25b) are mounted pivotably about their pivot axes (S1, S2) on bearing bolts (201) extending from the underside of the steering plate (23). 8. Skateboard according to one of claims 1 to 7, characterized in that the pivot axes (S1, S2) of the steering knuckles (21a, 21b) are arranged in front of the wheel axles (24a, 24b) of the front wheels (25a, 25b) as seen in the direction of travel (F) of the skateboard and the tie rod (22) engages the steering knuckles (21a, 21b) behind the wheel axles (24a, 24b) as seen in the direction of travel (F) of the skateboard. 9. Skateboard according to one of claims 1 to 8, characterized in that the pivot axis (L) of the steering plate (23) is arranged horizontally and the pivot axes (S1, S2) are arranged vertically, preferably at right angles to the pivot axis (L). 10. Roller board according to one of claims 1 to 9, characterized in that on the footboard (1) in the region of the front end (10) there is provided a joint (6) with a fixed bearing part (60) and a pivoting part (61) pivotably connected thereto, wherein the fixed bearing part (60) is firmly connected to the footboard (1) and a handlebar (5) is attached to the pivoting part (61), which can be folded and locked by means of the joint (6) from a position running essentially parallel to the footboard (1) into an upright position relative to it and vice versa. 11. Roller board according to claim 10, characterized in that the pivot pin (605) is held in the fixed bearing part (60) of the joint (6) and is inserted into the steering plate (23) with a free end projecting in the direction of travel (F). 12. Skateboard according to one of claims 1 to 11, characterized in that a substantially U-shaped rear wheel holder (3) is provided and is fastened to the rear end (11) of the footboard (1) and a rear wheel (3) with a braking device is fastened to the rear wheel holder (3). 13. Skateboard according to claim 12, characterized in that the braking device comprises a brake shoe (40) which can be pressed circumferentially onto the rear wheel (3) and which is fastened to the rear wheel holder (30) with the interposition of an elastically compressible return element (41). 14. Skateboard according to one of claims 1 to 11, characterized in that two rear wheels (75a, 75b) arranged mirror-symmetrically to the longitudinal axis (M) of the footboard (1) are provided. 15. Roller board according to claim (14), characterized in that the rear wheels (75a, 75b) are mounted on separate wheel axles (74a, 74b) on steering knuckles (71a, 71b) and the steering knuckles are pivotably mounted at one of their ends about respective pivot axes (S3, S4) and are connected to one another at their other end via a tie rod (72), so that the rear wheels (75a, 75b) can be pivoted in parallel about its longitudinal axis (M) when the running board (1) is tilted and a steering plate (73) is provided which is pivotably mounted at the rear end of the running board (1) about a pivot axis (H) running counter to the direction of travel (F) of the roller board relative to the running board (1) and the steering knuckles (71a, 71b) can be pivoted about their pivot axes (S3, S4) on the steering plate (73) and the running board (1) has a control element which is operatively connected to the tie rod (72), by means of which a relative pivoting movement between the running board (1) and the steering plate (73) as a result of tilting of the running board can be transferred into a longitudinal displacement of the tie rod (72) transversely to the longitudinal axis (M) of the running board (1). 16. Skateboard according to one of claims 14 or 15, characterized in that a control pin (721) is provided as the control element, which is fastened to the footboard (1) and projects beyond it in the opposite direction to the direction of travel (F), and which is guided in a slot in the tie rod (72) extending in the vertical direction. 17. Skateboard according to one of claims 14 to 16, characterized in that the tie rod (72) has a control housing (722) in which the elongated hole for receiving the control pin (721) is formed. 18. A roller board according to one of claims 14 to 17, characterized in that the steering plate (73) is pivotally mounted about a pivot pin (606) fastened to the footboard (1) which defines the pivot axis (H). 19. Skateboard according to one of claims 14 to 18, characterized in that the pivot axis (H) is arranged on a line with the pivot axis (L) of the steering plate (23) arranged at the front end (10) of the footboard (1). 20. Skateboard according to one of claims 14 to 19, characterized in that the steering knuckles (71a, 71b) of the rear wheels (75a, 75b) are pivotably mounted about their pivot axes (S3, S4) on bearing bolts (701) extending from the underside of the steering plate (73). 21. Skateboard according to one of claims 14 to 20, characterized in that the pivot axes (S3, S4) of the steering knuckles (71a, 71b) are arranged behind the wheel axles (74a, 74b) of the rear wheels (75a, 75b) as seen in the direction of travel (F) of the skateboard and the tie rod (72) engages the steering knuckles (71a, 71b) in front of the wheel axles (74a, 74b) as seen in the direction of travel (F) of the skateboard. 22. Roller board according to one of claims 14 to 21, characterized in that the pivot pin (606) is held in a housing (64) fastened in the region of the rear end (11) of the footboard (1) and is inserted into the steering plate (72) with a free end projecting against the direction of travel (F). 23. Skateboard according to one of claims 14 to 22, characterized in that the pivot axes (S1, S2, S3, S4) are arranged parallel to one another. 24. Skateboard according to one of claims 14 to 23, characterized in that the front wheels (25a, 25b) are pivoted in the opposite direction to the rear wheels (75a, 75b) when the footboard (1) is tilted about its longitudinal axis (M). 25. Skateboard according to one of claims 1 to 24, characterized in that the front and rear wheels (25a, 25b, 3 and 75a, 75b respectively) have a cylindrical running surface. 26. Skateboard according to one of claims 1 to 25, characterized in that the front and rear wheels (25a, 25b, 3 and 75a, 75b respectively) are at least 35 mm, preferably 40 mm wide.