WO2024008504A1

WO2024008504A1 - Skateboard suspension and skateboard axle

Info

Publication number: WO2024008504A1
Application number: PCT/EP2023/067343
Authority: WO
Inventors: Henning Wagner
Original assignee: Henning Wagner
Priority date: 2022-07-05
Filing date: 2023-06-26
Publication date: 2024-01-11
Also published as: DE102022116787B4; DE102022116787A1

Abstract

The invention relates to a skateboard suspension (10), in particular for use in a front axle of a surf skateboard (1). The skateboard suspension (10) according to the invention is intended for attachment to a rotating element (50) of a skateboard (1) having a board (40), wherein the rotating element (50) is designed to enable rotation of the skateboard suspension (10) on the board (40) about an axis of rotation. The skateboard suspension (10) according to the invention firstly has a connecting element (11) which is designed to attach the skateboard suspension (10) to the rotating element (50). Further, the skateboard axle (20) according to the invention has a rotatably mounted roller (30). The roller (30) is positioned behind the axis of rotation of the rotating element (50). Further, the skateboard suspension (10) according to the invention has a rocker arm (14), to which the at least one roller (30) is attached and which is attached to the connecting element (11) by means of a first bearing (12). The first bearing (12) is provided in such a way that it enables a vertical movement of the roller (30). The vertical movement is cushioned by a first elastic element (15).

Description

Skateboard suspension and skateboard axle

The invention relates to a skateboard suspension, a skateboard axle, in particular a skateboard front axle, and a skateboard, in particular a surf skateboard, which has the skateboard axle according to the invention.

Surf skating is a young trend sport that combines elements of surfing (wave riding) and skating. Motivated by the idea of transferring the movement sequences typical of surfing to the skateboard sport of skating, so-called surf skateboards were created, which more or less effectively enable movement on a skateboard by imitating the swinging and rhythmic movements of surfing.

In contrast to conventional (street) skating with conventional skateboards, the acceleration in the direction of travel is not generated by pedaling (known in technical language as “pushing”), but by driving in curves with a targeted variation of the moment of inertia around the axis of rotation of the curve. By stretching and compressing the body along the axis on which there is a stable balance of gravity and centrifugal force, the moment of inertia can be varied and thus a rotational acceleration can be generated. If the body's center of gravity is kept low when entering the curve and thus outside of the orbit around the center of the curve, the center of gravity can be brought closer to the axis of rotation (through the center of the curve) by stretching the body, thereby reducing the moment of inertia. By preserving the angular momentum, cornering is accelerated. This increase in speed in the tangential direction can be translated into straight travel during the transition, so that speed can be built up with a sequential repetition of cornering in alternating directions using this technique.

Various forms of skateboards are known in the prior art, which are optimized for the movement sequence described above in order to transfer the most authentic surfing feeling possible to the skateboard. Figs. 1a and 1b shows a surf skateboard 1 according to an embodiment of the prior art, which has a rear and a front skateboard axle 20. Two rollers 30 are arranged on each of the two skateboard axles 20. The two skateboard axles 20 are mounted on the surfskateboard board 40 (hereinafter referred to as board 40). The view shown from Fig. 1a shows the surfskateboard 1 from below, while the view from Fig. 1b shows the surfskateboard 1 from the front. The surf skateboard 1 has a longitudinal axis y and a transverse axis x, which also runs horizontally perpendicular to it. The vertical axis, which on is perpendicular to the two axes mentioned above and points in the vertical direction, is simply referred to as the vertical axis z.

To drive straight ahead, i.e. in the direction of the longitudinal axis y, the athlete stands on the board 40 in such a way that his body axis runs in the direction of the vertical axis z and, if possible, so that his body's center of gravity lies on the longitudinal axis y in order not to make any curves. If the athlete shifts his weight by tilting the body axis, for example against the direction of the transverse axis x, a rolling movement of the board 40 about the longitudinal axis y is caused, as shown in Fig. 1b by the dashed line and in Fig. 1a by the arrow around the Longitudinal axis y is indicated. The rolling movement in turn causes the skateboard axles 20 of the surf skateboard 1 to rotate from their zero position, i.e. from the position when driving straight ahead, about the vertical axis z, as indicated by the dashed lines in Fig. 1a. However, all four rollers 30 remain on the floor and do not carry out any vertical movement (see Fig. 1b). This rotation of the axles forces the surf skateboard onto a curved path. By executing the sequence of movements described above, the surf skateboard 1 can then be accelerated.

In order to be able to implement the described rotation of the skateboard axles, skateboard axles have a corresponding bearing with elastic elements, which exert a force on the skateboard axles when cornering, which counteracts the rotational movement of the axles and acts in the direction of the zero position (neutral position) of the axles. The axles of surf skateboards, which are special compared to the axles of conventional skateboards, have significantly softer elastic elements, which enable tighter curve radii, but place greater demands on the athlete's sense of balance.

In many respects, state-of-the-art surf skateboards come quite close to the typical movements of surfing. One component of the complex movement sequences, which cannot be implemented with a surf skateboard according to the state of the art, is the pumping movement transmitted by people to the board, which, in conjunction with the buoyancy of the water, causes the surfboard to rock around the transverse axis. This movement can also be referred to as the pitching movement of the board and, on the one hand, helps to find a better rhythm when cornering and supports the change in the height of the body's center of gravity when cornering as described above. On the other hand, this effect can be used for better acceleration regardless of cornering. The pumping movement described is a very typical movement for surfing and as such is not included in any other related board sport such as snowboarding, wakeboarding or conventional skateboarding. It is therefore fundamental to the feeling of movement when surfing.

In addition, surf skateboards according to the state of the art are optimized for a certain speed and therefore a certain curve radius due to the corresponding suspensions and axles. This means that the movement sequence, which is similar to surfing, can only be fully achieved in these designed speed ranges. Concepts are also already known from the prior art, which are only equipped with a front wheel, as disclosed, for example, in patent application EP 2 186 553 A1. However, such concepts cannot compensate for the disadvantages presented above.

Given the prior art described, it is therefore the object of the present invention to provide an alternative skateboard suspension, an alternative skateboard axle and an alternative skateboard with which the disadvantages identified in the prior art can be eliminated.

This task is solved by the subject matter of the independent claims. Advantageous further developments of the invention are contained in the subclaims.

The skateboard suspension according to the invention is intended for attachment to a rotation element of a skateboard with a board, the rotation element being designed to enable rotation of the skateboard suspension on the board about an axis of rotation. A rotational movement on the board is understood to be a rotational movement essentially around the vertical axis of the skateboard, i.e. in the plane spanned by the longitudinal axis and transverse axis. “Essentially around the vertical axis” refers to deviations of up to a maximum of 45°. The skateboard suspension according to the invention initially has a connecting element which is designed to attach the skateboard suspension to the rotating element. Furthermore, the skateboard suspension according to the invention has a rotatably mounted roller. A roller axis, which rotatably supports the roller, lies in a plane which is spanned perpendicular to the axis of rotation of the rotating element. The roller is positioned downstream of the rotation axis of the rotation element, i.e. positioned behind the rotation axis in a longitudinal direction of the board in the direction of travel. This type of downstream positioning is also known as tracking or tracking principle and is known, for example, from shopping carts. Furthermore, the skateboard suspension according to the invention has a rocker arm to which the at least one roller is attached and which is attached to the connecting element by means of a first bearing. The first bearing is provided in such a way that it enables a vertical movement of the roller, i.e. a movement in the direction of the vertical axis of the skateboard. The vertical movement is cushioned by a first elastic element.

By means of the vertical mobility of the roller, which is sprung according to the invention, a vertical pumping movement of the athlete is transferred to the board, whereby a driving experience of a surfskateboard can be created, which comes significantly closer to the movement sequence of surfing in its complexity than with conventional surfskateboards according to the state of the art. In addition, the skateboard suspension according to the invention makes it possible to carry out the accelerating movement sequence at different speeds and with different curve radii. Using the skateboard suspension according to the invention, the duration in which the angular momentum-conserving effect works can be influenced by the athlete and thus compared to embodiments of the prior art be extended. This allows rhythms with a lower frequency to be driven, which results in acceleration and thus higher speeds overall.

In an advantageous embodiment of the invention, the roller together with the suspension that attaches it to the rocker arm is rotatably mounted about a longitudinal axis of the rocker arm. In this way, the alignment of the roller can be improved, especially in narrow curve radii, which means that material wear on the roller can be reduced due to lower lateral acceleration. This embodiment is particularly advantageous in which a rotational movement of the suspension about a longitudinal axis of the rocker arm is possible if this rotational movement is sprung and/or damped by a correspondingly provided elastic element and this suspension or damping is in particular adjustable. The elastic element is therefore provided to counteract a force that counteracts the rotational movement.

Furthermore, an embodiment of the invention is advantageous in which the first bearing enables the rocker arm to rotate about a horizontal axis in the zero position of the skateboard suspension. The horizontal axis is any axis that lies in the plane spanned by the transverse and longitudinal axes. In a simple form of this embodiment, a horizontally arranged axis is provided on the connecting element, around which the rocker arm can rotate. Since the roller is connected to the rocker arm, a movement of the roller can be implemented at least partially in the vertical direction (i.e. a vertical movement). However, the invention is not limited to such an implementation of the vertical movement of the roller. For example, it is also conceivable to mount the rocker arm resiliently in a linear guide, with the linear guide being understood here as the first bearing. It is also conceivable to design the rocker arm directly as a linearly guided and spring-loaded (telescopic) rod.

The first elastic element is preferably designed in the form of a spring, in particular in the form of a torsion spring. Springs are widespread, inexpensive components that are available in various clearly definable strengths and sizes. They also have a long service life with little wear and are therefore ideal as an elastic element. Springs can be easily integrated into the structure of the bearings and thus contribute to a compact design of the skateboard suspension.

Embodiments with springs are particularly preferred if they are pretensioned and the pretension of the springs can in particular be adjusted. This means that the axle can be adjusted and adapted to the athlete's preferences or his constitution with regard to his weight and strength.

In an advantageous embodiment of the invention, the skateboard suspension has, in addition to the first elastic element, a damping element which is designed to dampen the vertical movement of the roller. Advantageously, the skateboard suspension only has a central role. This ensures that the board has a high inclination when cornering with small radii. However, embodiments with two or more roles are also conceivable.

Furthermore, the skateboard suspension preferably has two rollers, particularly preferably arranged in parallel, which are connected by a common axle. The axle is preferably rigidly connected to the rocker arm or formed as a part of it.

Preferably, a third bearing is also provided, which enables rotation of the bearing or the rocker arm or a part of the rocker arm about an axis which deviates less than 60 degrees from the longitudinal axis of the skateboard in each deflection position. This enables rotation about an axis that essentially corresponds to the longitudinal axis of the skateboard, which further optimizes the driving behavior with a view to imitating the feeling of riding a surfboard when riding waves. An elastic element is preferably provided, which generates a force that counteracts the rotation. Such an embodiment can ensure that when two rollers are used on the skateboard suspension, both rollers do not lose contact with the ground even when cornering sharply. The third bearing or the third bearing can be arranged at different points in the connecting element and in the rocker arm. It can also be provided between the board and the connecting element. In addition, in one embodiment of the invention, it is conceivable to combine the different bearings and, for example, to represent them using a ball joint.

In a preferred embodiment of the invention, the first bearing of the rocker arm and/or the third bearing is arranged offset in the longitudinal direction of the skateboard relative to the rotation element, which enables the skateboard suspension to rotate substantially about the vertical axis of the skateboard (vertical axis). Consequently, the first bearing and/or the third bearing is arranged in front of or behind the rotation element in the longitudinal direction.

A skateboard axle according to the invention of a skateboard with a board has at least one skateboard suspension according to the invention and at least one rotation element which is designed to enable rotation of the skateboard suspension on the board. As described above, by using such a skateboard axle, the movement of surfing on a skateboard can be imitated as best as possible with a corresponding axle.

In an advantageous embodiment of the skateboard axle according to the invention, the rotation element has a second elastic element which is designed to provide a force counteracting this rotation in the event of a rotation of the skateboard suspension on the board. This ensures that the skateboard suspension is always returned to a neutral position when no external forces are applied. The neutral position (zero position) is preferably defined so that the roller moves in the direction of The transverse axis of the skateboard is at the level of the longitudinal axis. The second elastic element can also provide a force when cornering, which helps the athlete to turn cornering into straight-ahead driving and then into cornering in the opposite direction.

The second elastic element is preferably designed as a spring, in particular as a torsion spring. As already stated, springs are widespread, inexpensive components that are available in various clearly definable strengths and sizes. They also have a long service life with little wear and are therefore ideal as an elastic element. Springs can be easily integrated into the structure of the bearings and thus contribute to a compact design of the skateboard axle. It is particularly preferred if the spring is pretensioned and the pretension can be adjusted.

Also preferred is an embodiment of the skateboard axle in which the rotation element has, in addition to the second elastic element, a second damping element, which is designed to dampen the rotational movement of the rocker arm on the board.

In an advantageous embodiment of the invention, the axis of rotation of the rotation element and thus the skateboard suspension on the board is set at a certain angle to the vertical axis of the board. Thus, the axis of rotation does not coincide with the vertical axis. By adjusting the rotation axis to the vertical axis, the driving characteristics of the skateboard can be adjusted and adapted to personal preferences. In addition, by adjusting the rotation axis to the vertical axis, a restoring moment is generated, which moves the skateboard axle back towards the zero position, i.e. the neutral position without cornering, while driving. The best driving characteristics were found in an angle of attack to the vertical axis between 15 and 40 degrees.

In a further advantageous embodiment of the skateboard axle according to the invention, the rotation element has a fastening section and a rotation section, the fastening section being firmly, i.e. immovably, connected to the board and the skateboard suspension being fastened to the rotation section by means of the connecting element. Furthermore, in this embodiment, the rotation bearing for realizing the rotation between the skateboard suspension and the board is provided between the fastening section and the rotation section. Such an embodiment has the advantage of a simple geometry, whereby the position of the roller in relation to the attachment point can be determined by the dimensions of the rotation section. It is possible to mount rotation sections of different dimensions in order to be able to adjust the position of the roller and thus the geometry of the caster. In addition, the described embodiment has advantages with regard to the interchangeability of different components in the event of damage.

The skateboard according to the invention has at least one skateboard axle according to the invention. The skateboard axle is intended in particular as the front axle of the skateboard. Aspects and advantageous embodiments of the invention are explained in more detail below with reference to the accompanying drawings. These show:

Fig. 1a Surfskateboard 1 according to the prior art in a view from below

Fig. 1b Surfskateboard 1 according to Fig. 1a in a view from the front

Fig. 2a shows a schematic representation of a first embodiment of a surf skateboard 1 according to the invention in a perspective view from below

Fig. 2b schematic representation of the surf skateboard 1 according to the invention according to Fig. 2a in a side view

Fig. 3 representation of a surf skateboard 1 according to the invention in a second embodiment in a perspective detailed view

4 shows a schematic representation of a further embodiment of the skateboard 1 according to the invention with the skateboard suspension 10 according to the invention.

The Figs. 1a and 1b have already been described in more detail when explaining the prior art. A further description is therefore omitted here.

The Figs. 2a and 2b show schematic representations of a first embodiment of a surfskateboard 1 according to the invention. Fig. 2a shows the surfskateboard 1 in a perspective view from below, while Fig. 2b shows a side view of the surfskateboard 1. Also for the figs. 2a, 2b and 3 already apply with regard to Figs. 1a and 1b defined axes (longitudinal axis y, transverse axis x, vertical axis z) of a surf skateboard 1.

The surf skateboard 1 according to the invention according to Figs. 2a and 2b have a conventional skateboard axle 20 according to the prior art with two rollers 30 attached to it as the rear axle, a board 40 and a skateboard axle 20 according to the invention as the front axle. The skateboard axle 20 according to the invention consists of a skateboard suspension 10 according to the invention and a rotation element 50. A rocker lever 14 is connected to the connecting element 11 via a first bearing 12, a roller 30 being arranged on the rocker lever 14, which is located on the rocker lever 14 by a corresponding roller suspension can rotate about a horizontal axis. The position of the roller 30 is arranged in the direction of travel (positive direction of the longitudinal axis y) along the longitudinal axis y behind the fastening position of the skateboard axle 10 on the board 40. The roller 30 is therefore downstream of the fastening position. The skateboard suspension 10 further has a connecting element 11 which is connected to the rotation element 50. The rotation element 50 is connected to the board 40 and has a second bearing 53.

The first bearing 12 enables the rocker arm 14 to rotate about a horizontal axis and thus a vertical movement of the roller 30 on the skateboard suspension 10, i.e. a movement in the direction of the vertical axis z. Even if the roller 30 in the embodiment shown moves, strictly speaking, on a circular path around the first bearing 12 of the rocker arm 14, it also carries out a vertical movement in the sense of the application. A first elastic element 15 is provided between the board 40 and the rocker arm 14, which cushions the vertical movement of the roller 30 or the rotation of the rocker lever 14. If the roller 30 is deflected from the zero position shown in the vertical direction, the first elastic element 15 applies a force or moment opposite to this deflection to the rocker arm 14, which tries to bring the rocker lever 14 and the roller 30 back into the zero position bring to.

The second bearing 53, on the other hand, enables a horizontal rotation of the skateboard suspension 10 including the rocker arm 14, i.e. a rotation about the vertical axis z. This movement is also sprung by a second elastic element 54, which, when the skateboard suspension 10 moves horizontally from the zero position shown, applies a force or moment that counteracts this movement.

The sequence of movements for controlling the surf skateboard 1 corresponds to the sequence of movements for using conventional surf skateboards already explained above with regard to the prior art. If the athlete shifts his center of gravity from the longitudinal axis y along the transverse axis x, a rolling movement of the board 40 around the longitudinal axis y is also generated here. This rolling movement is accompanied by a horizontal rotation of the rocker arm 14 around the second bearing 53 and thus with a deflection of the roller 30 of the skateboard axle 10 from the longitudinal axis y. The surf skateboard 1 is thus forced into curves. The surf skateboard 1 experiences a restoring moment against the rolling movement through the conventionally designed rear axle and partly through the second elastic element 54. Due to the only one roller 30 on the front axle, the surf skateboard 1 can tip over easily. The athlete must therefore maintain balance when cornering under the influence of centrifugal force and weight, similar to when surfing.

Unlike conventional concepts of surf skateboards 1, the athlete is able to perform a pumping movement by shifting the body's center of gravity along the vertical axis z using a movement that is similar to a squat, which is cushioned by the first elastic element 15. The pumping movement is a movement of the athlete on the board, using which he moves his center of gravity up and down along the vertical axis. This movement causes a relative vertical movement between the board 40 and the roller 30 on the skateboard axle 20 according to the invention. The athlete can thus compress the first elastic element 15 when entering the curve by lowering the center of gravity of the body and, while cornering, use the energy stored in the first elastic element 15 by raising the center of gravity again. The lowering and raising of the body's center of gravity describes the pumping movement. This results in a supporting effect when stretching the body to vary the moment of inertia and a beneficial and easily adaptable rhythm setting. Another advantageous aspect is that cornering for acceleration with the surf skateboard 1 according to the invention described here works effectively with different frequencies or curve radii. This ensures an authentic surfing feeling at different speeds and curve radii.

Fig. 3 shows a representation of a surf skateboard 1 according to the invention in a second embodiment in a perspective detailed view. Shown is a board 40 with a skateboard axle 20, which is composed of a skateboard suspension 10 and a rotation element 50. The skateboard suspension 10 has a connecting element 11, which is provided for attaching the skateboard suspension 10 to the rotating element 50. Skateboard suspension 10 and rotation element 50 together form a skateboard axle 20. In the configuration shown, the skateboard axle 20 is in the zero position.

Furthermore, the skateboard suspension 10 has a rocker arm 14 with a fork 141, which is connected to a slide ring 142 on the side of the fork 141 and to the connecting element 11 on the opposite side. Furthermore, a roller suspension 31 is provided on the rocker arm 14. In the roller suspension 31 there is a roller axis 311 which is arranged horizontally in the zero position of the skateboard axis and which rotatably supports a roller 30. In other words, the roller axis 311 lies in a plane which is spanned perpendicular to the rotation axis of the rotation element 50. A rigid connecting rod is provided between the roller suspension 31 and the connecting element 11, on whose longitudinal axis the sliding ring 142 is movably arranged. Between the sliding ring 142 and the connecting element 11, a first elastic element 15 is provided in the form of a spring, which winds around the connecting rod. A lower limit 16 of the spring is adjustable along the longitudinal axis of the rigid connecting rod, for example by means of a thread on the rigid connecting rod. By changing the position of the lower limit 16, the preload of the spring can be adjusted.

The rocker arm 14 in the embodiment shown is designed as a one-piece connection, but can also deviate from this in other embodiments and, for example, be designed as a multi-part and composite component. In addition, other possibilities are also conceivable to provide an elastic element, for example in which a torsion spring is provided in the attachment point between the rocker arm 14 and the connecting element 11. In addition, the rigid connecting rod can be dispensed with if the fork 141 of the rocker arm 14 is connected directly to the roller suspension 31.

3, the rotation element 50 has a fastening section 51 and a rotation section 52, the fastening section 51 fastening the skateboard axle 20 as a whole to the board 40 and the rotation section 52 being fastened to the connecting element 11. The attachments of the fastening section 51 to the board 40 and the connecting element 11 to the rotation section 52 are carried out as shown However, embodiments using screw connections are also conceivable in other forms. A second bearing 53 is provided between the rotation section 52 and the fastening section 51, which enables horizontal rotation of the rotation section 52 and thus of the skateboard suspension 10. A second elastic element 54 is provided (not shown in FIG. 3), which exerts a force on the skateboard suspension 10 in the direction of the zero position shown when it rotates.

If the surf skateboard 1 is loaded by the athlete's weight, the roller 30 moves vertically, which is made possible by the rotation of the rocker lever 14 around the first bearing 12. For this purpose, the rocker arm 14 rotates about its attachment to the connecting element 11 and thereby presses in the spring (the elastic element 15) using the sliding ring 142. The rigid connecting rod between the roller suspension 31 and the connecting element 11 also rotates about its attachment to the connecting element 11, whereby the roller 30 experiences a vertical movement, which is sprung by the spring. Using the adjustable lower limit 16, the pretension of the spring and thus the force required for a specific deflection of the roller can be adjusted.

If the athlete carries out the pumping movement described above, this results in the distance between board 40 and roller 30 constantly varying in accordance with the pumping movement. This movement is supported by the first elastic element 15. By shifting the weight from the longitudinal axis y in the direction of the transverse axis x, a rotation of the rotation element 50 and thus the skateboard suspension 10 on the board 40 is caused and the skateboard 1 is forced onto a curved path. As a result of this cornering, the roller axis 311 is no longer in a horizontal arrangement, as is the case in the zero position of the axis shown. The second elastic element 54 causes a force that counteracts the rotation of the skateboard suspension 10 and thus helps the driver to convert cornering into straight-ahead travel and finally into opposite cornering and thus accelerate the skateboard 1.

4 shows a further embodiment of the skateboard 1 according to the invention with the skateboard suspension 10 according to the invention. The embodiment largely corresponds to the embodiment shown in FIGS. 2a and 2b, which is why only the differences between the embodiments will be discussed at this point. Furthermore, reference is made to the comments on FIGS. 2a and 2b.

First, the embodiment of the skateboard suspension 10 and thus the skateboard 1 provides two rollers 30 on the front axle. These are arranged parallel to each other, i.e. concentrically, in the x direction and connected to a common axis. The axle is firmly connected to the swing arm 14 and can, for example, be designed as a component, i.e. in one piece, with the swing arm 14. For reasons of clarity, the front roller 30 in the drawing plane is shown by dashed lines. As in the embodiment according to FIG. 2a, a first bearing 12 is also provided here between the connecting element 11 and the rocker arm 14, which allows the rocker lever 14 and This allows the rollers 30 to move around the first bearing 12 in the x direction, i.e. the transverse direction of the skateboard. A first elastic element 15 is also provided here, which forms a force on the rocker arm 14 which is directed in such a way as to bring it into a starting position. The force acting from the elastic element 15 when deflected from the starting position thus counteracts the movement. The first elastic element 15 can be supported against the board 40, as in the embodiment according to FIG. 2a, or against the connecting element 11, as shown in FIG. 4.

In general, in addition to elastic elements, damper elements can also be provided, which dampen a corresponding movement on the bearings and thus take energy from the movement.

Furthermore, in contrast to the embodiment according to FIG. 2a, the connecting element 11 is designed to be angled, the angle being designed such that part of the connecting element 11 is oriented backwards in the direction of the longitudinal axis y in the starting position. This ensures that the rollers 30 are positioned in the direction of the longitudinal axis y behind the second bearing 53, which represents the connection between the board 40 and the connecting element 11. The wording “angled” is to be understood in such a way that the connection to the rocker arm 14 is displaced in the direction of the longitudinal axis y in the undeflected state compared to the connection point between the connecting element and the board. This can be achieved in a structurally simple case using a connecting element 11 designed as an angle.

Furthermore, a third bearing 13 is provided within the connecting element 11, which enables rotation of the two parts of the connecting element 11 connected by the third bearing 13 essentially about the longitudinal axis y of the surf skateboard 1 in the undeflected state. “Essentially about the longitudinal axis y of the surf skateboard 1” is understood to be a rotation whose axis of rotation deviates by a maximum of 60 degrees from the longitudinal axis y of the surf skateboard 1 when the surf skateboard 1 is in the undeflected state. The rotation at the third bearing 13 is preferably braked, as shown, by a further elastic element, which applies a force opposite to the rotation to the rotating part and brings it back into a starting position as soon as the deflecting force disappears. The angled connecting element provides an offset in the longitudinal direction y of the surf skateboard 1 between the rotation element 50 and the third bearing 13 in the undeflected state. The angled connecting element 11 is just one way to produce this offset and the invention is not limited to this.

Other embodiments of the invention are also conceivable, in which the third bearing 13 is formed at a different location on the connecting element 11 or as part of the rocker arm 14, with the third bearing 13 then allowing rotation essentially about the longitudinal axis of the rocker lever 14. In addition, in a further embodiment, the third bearing 13 can be provided between the board 40 and the connecting element 11. The first storage 12 and the third storage 13 are also conceivable as a storage with each appropriate degrees of rotational freedom to be provided. Furthermore, embodiments are conceivable in which the first bearing 12, the second bearing 53 and the third bearing 13 are formed in a bearing, such as in a ball joint.

The third bearing 13 can be understood as any bearing which enables rotation of the rocker arm 14 or a part of the rocker lever 14 or the connecting element 11 (in the case of positioning between the board and the connecting element) about an axis which is less than 60 in every possible deflection position Degrees deviates from the longitudinal axis y of the skateboard. It therefore provides a degree of rotational freedom in every possible position during ferry operation, which vectorially contains a y component (longitudinal direction of the skateboard) in the global coordinate system. By providing three bearings, their axes of rotation span a 3-dimensional space and are linearly independent of each other from a vectorial perspective.

Deviating from the embodiments of the invention shown in the figures, embodiments of the invention are also conceivable in which the connecting element 11 is already connected to the board 40 of the skateboard 1 at an angle other than 90 degrees.

REFERENCE SYMBOL LIST

1 surf skateboard

10 skateboard suspension

11 connecting element

12 first storage

13 third storage

14 rocker arms

141 fork

142 slide ring

15 first elastic element

16 lower limit

20 skateboard axle

30 roll

31 roller suspension

311 axis

40 board

50 rotation element

51 fastening section

52 rotation section

53 second storage

54 second elastic element x transverse axis y longitudinal axis

Vertical axis

Claims

PATENT CLAIMS

1 . Skateboard suspension (10) for attachment to a rotation element (50) of a skateboard (1) with a board (40), the rotation element (50) being designed to rotate the skateboard suspension (10) on the board (40) about an axis of rotation to make it possible to have the skateboard suspension (10), a connecting element (11), designed to fasten the skateboard suspension (10) on the rotating element (50) at a fastening position, at least one rotatably mounted roller (30), the roller (30) downstream of the axis of rotation of the rotation element (50) on the board (40), a rocking lever (14) to which the roller (30) is attached and which is attached to the connecting element (11) by means of a first bearing (12), whereby the first bearing (12) of the rocker arm (14) is provided in such a way that it enables a vertical movement of the at least one roller (30), the vertical movement being cushioned by a first elastic element (15).

2. Skateboard suspension (10) according to the preceding claim, wherein the roller (30) is rotatably mounted about a longitudinal axis of the rocker arm (14).

3. Skateboard suspension (10) according to one of the preceding claims, wherein the first bearing (12) enables rotation of the rocker arm (14) about a horizontal axis.

4. Skateboard suspension (10) according to one of the preceding claims, wherein the first elastic element (15) is designed in the form of a spring, in particular in the form of a torsion spring, the preload of the spring being in particular adjustable.

5. Skateboard suspension (10) according to one of the preceding claims, wherein in addition to the first elastic element (15), a first damping element is provided, which is designed to dampen the vertical movement of the roller (30).

6. Skateboard axle (20) of a skateboard (1) with a board (40), having at least one skateboard suspension (10) according to one of the preceding claims, at least one rotation element (50) designed to enable rotation of the skateboard suspension (10) on the board (40) about an axis of rotation. Skateboard axle (20) according to the preceding claim, wherein the rotation element (50) has a second elastic element (54) which is designed to provide a force counteracting this rotation in the event of a rotation of the skateboard suspension (10) on the board (40). , wherein the second elastic element (54) is preferably designed in the form of a spring, particularly preferably in the form of a torsion spring. Skateboard axle (20) according to the preceding claim, wherein a second damping element is provided which is designed to dampen the rotational movement of the skateboard suspension (10) on the board (40). Skateboard axle (20) according to one of the preceding claims 6 to 8, wherein the axis of rotation of the skateboard suspension (10) on the board (40) is relative to a vertical axis (z) of the board (40) by a certain angle, in particular an angle between 15 and 40 degree is employed. Skateboard (1) having at least one skateboard axle (20) according to one of the preceding claims 6 to 9, wherein the skateboard axle (20) is provided in particular as a front axle.