Skateboard suspension and skateboard axle

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

[0001] Skateboard suspension and skateboard axle

[0002] The invention relates to a skateboard suspension, a skateboard axle, in particular a skateboard front axle, and a skateboard, in particular a surfskateboard, which has the skateboard axle according to the invention.

[0003] Surf skating is a new trend sport that combines elements of surfing (wave riding) and skateboarding. Motivated by the idea of ​​transferring the movements typical of surfing to the skateboard sport of skateboarding, so-called surf skateboards emerged, which more or less effectively enable skateboarding by imitating the energetic and rhythmic movements of surfing.

[0004] In contrast to conventional (street) skating with conventional skateboards, acceleration in the direction of travel is not generated by pedaling (known in technical terms as "pushing"), but by cornering 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 a stable equilibrium between gravity and centrifugal force exists, 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 on the outside of the orbit around the center of the curve, the body's center of gravity can be moved closer to the axis of rotation (through the center of the curve) by stretching the body, thereby reducing the moment of inertia. The conservation of angular momentum accelerates cornering.This increase in speed in the tangential direction can be translated into a straight line during the transition, so that with a sequential repetition of cornering in alternating directions, speed can be built up using this technique.

[0005] Various forms of skateboards are known in the prior art which are optimized for the movement sequence described above in order to convey the most authentic surfing feeling possible to the skateboard. Figs. 1a and 1b show a surfskateboard 1 according to an embodiment of the prior art, which has a rear and a front skateboard axle 20. Two wheels 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 in Fig. 1a shows the surfskateboard 1 from below, while the view in Fig. 1b shows the surfskateboard 1 from the front. The surfskateboard 1 has a longitudinal axis y and a transverse axis x which runs horizontally and perpendicular to the longitudinal axis. The vertical axis, which is perpendicular to the two aforementioned axes and points in the vertical direction, is simply referred to as the vertical axis z.

[0006] For straight-ahead travel, i.e., in the direction of the longitudinal axis y, the athlete positions themselves on the board 40 such that their body axis runs in the direction of the vertical axis z and, if possible, such that their center of gravity lies on the longitudinal axis y to avoid cornering. If the athlete shifts their weight by tilting their body axis, for example, against the direction of the transverse axis x, this causes the board 40 to roll around the longitudinal axis y, as indicated by the dashed line in Fig. 1b and by the arrow around the longitudinal axis y in Fig. 1a. This rolling movement, in turn, causes the skateboard axles 20 of the surfskateboard 1 to rotate from their zero position, i.e., from the position when traveling straight ahead, around the vertical axis z, as indicated by the dashed lines in Fig. 1a. However, all four wheels 30 remain on the ground and do not perform any vertical movement (see Fig. 1b).This rotation of the axles forces the surfskateboard into a curved path. By executing the movement sequence described above, the surfskateboard 1 can then be accelerated.

[0007] To enable the described rotation of the skateboard axles, skateboard axles feature a corresponding bearing with elastic elements. These exert a force on the skateboard axles when cornering. This force counteracts the rotational movement of the axles and acts toward the zero (neutral) position of the axles. Compared to the axles of conventional skateboards, the special axles of surfskateboards, in particular, feature significantly softer elastic elements. While these allow for tighter turning radii, they place greater demands on the rider's sense of balance.

[0008] State-of-the-art surfskateboards are in many ways quite similar to the typical surfing movements. One component of the complex movement sequences that cannot be implemented with a state-of-the-art surfskateboard is the pumping motion transferred from the rider to the board, which, in conjunction with the buoyancy of the water, causes the surfboard to rock around its transverse axis. This motion can also be referred to as the pitching motion 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 independent of the cornering.The pumping motion described is a very typical movement for surfing and is not found in any other related board sports, such as snowboarding, wakeboarding, or traditional skateboarding. It is therefore fundamental to the feel of the surfing movement.

[0009] In addition, surfskateboards according to the state of the art are optimized for a specific speed and, consequently, a specific turning radius due to the corresponding suspension and axles. As a result, the motion sequence, which is similar to surfing, can only be fully achieved in these designed speed ranges. Prior art concepts are also already known that are equipped with only one front wheel, as disclosed, for example, in patent application EP 2 186 553 A1. However, such concepts cannot compensate for the disadvantages outlined above.

[0010] In view of the described prior art, it is therefore an 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 remedied.

[0011] This object is achieved by the subject matter of the independent claims. Advantageous further developments of the invention are contained in the subclaims.

[0012] The skateboard suspension according to the invention is intended for attachment to a rotating element of a skateboard with a board, wherein the rotating element is designed to enable rotation of the skateboard suspension on the board about a rotation axis. A rotational movement on the board is understood to mean a rotational movement essentially about the vertical axis of the skateboard, i.e. in the plane spanned by the longitudinal axis and transverse axis. Deviations of up to a maximum of 45° are understood to be "essentially about the vertical axis". The skateboard suspension according to the invention initially has a connecting element 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 mounts the roller, lies in a plane spanned perpendicular to the rotation axis of the rotating element.The roller is positioned downstream of the rotational axis of the rotating element, i.e., behind the rotational axis in a longitudinal direction of the board in the direction of travel. This type of downstream positioning is also referred to as caster or caster principle and is known, for example, from shopping carts. Furthermore, the skateboard suspension according to the invention comprises a rocker arm, to which the at least one roller is attached and which is fastened 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.

[0013] By means of the inventive, spring-loaded vertical mobility of the roller, a vertical pumping movement of the athlete is transferred to the board, creating a surfskateboard riding experience that is significantly closer in complexity to the motion sequence of surfing than with conventional surfskateboards according to the prior art. Furthermore, the skateboard suspension according to the invention makes it possible to perform the accelerating motion sequence at different speeds and with different curve radii. Using the skateboard suspension according to the invention, the duration for which the angular momentum conserving effect is effective can be influenced by the athlete and thus extended compared to prior art embodiments. This allows rhythms to be ridden at a lower frequency, at which acceleration is achieved and thus higher speeds overall.

[0014] In an advantageous embodiment of the invention, the roller, including the suspension that fastens it to the rocker arm, is mounted so as to be rotatable about a longitudinal axis of the rocker arm. In this way, the alignment of the roller can be improved, particularly in tight curve radii, whereby material wear on the roller can be reduced due to lower lateral acceleration. This embodiment is particularly advantageous in that a rotary movement of the suspension about a longitudinal axis of the rocker arm is possible if this rotary movement is spring-loaded and / or damped by a correspondingly provided elastic element, and this springing or damping is, in particular, adjustable. The elastic element is therefore provided to counteract a force that counteracts the rotary movement.

[0015] Another advantageous embodiment of the invention is one in which the first bearing enables rotation of the rocker arm about an axis that is horizontal in the neutral position of the skateboard suspension. A horizontal axis is understood to be 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 resiliently mount the rocker arm in a linear guide, wherein the linear guide is 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.

[0016] Preferably, the first elastic element is in the form of a spring, especially a torsion spring. Springs are widely available, inexpensive components that are available in various, clearly defined strengths and sizes. They also offer a long service life with low wear, making them ideal as an elastic element. Springs can be easily integrated into the bearing structure, thus contributing to a compact design of the skateboard suspension.

[0017] Embodiments with springs are particularly preferred if they are preloaded and the preload of the springs can be adjusted. Thus, the axle can be adjusted and adapted to the athlete's preferences or their constitution with regard to their weight and strength.

[0018] In an advantageous embodiment of the invention, the skateboard suspension comprises, in addition to the first elastic element, a damping element designed to dampen the vertical movement of the roller. Advantageously, the skateboard suspension comprises only one central roller. This ensures a high inclination of the board when cornering with small radii. However, embodiments with two or more rollers are also conceivable.

[0019] 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 single part thereof.

[0020] Preferably, a third bearing is also provided, which enables rotation of the bearing or the rocker arm or part of the rocker arm about an axis that deviates from the longitudinal axis of the skateboard by less than 60 degrees in any deflection position. This enables rotation about an axis that essentially corresponds to the longitudinal axis of the skateboard, which further optimizes the handling with regard to imitating the feel of a surfboard when surfing. Preferably, an elastic element is provided, which generates a force counteracting the rotation. Such an embodiment can ensure that when two wheels are used on the skateboard suspension, both wheels do not lose contact with the ground, even during sharp cornering. 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. Furthermore, in one embodiment of the invention, it is conceivable to combine the different bearings and, for example, to create a ball joint.

[0021] In a preferred embodiment of the invention, the first bearing of the rocker arm and / or the third bearing are arranged offset in the longitudinal direction of the skateboard relative to the rotation element, which enables rotation of the skateboard suspension substantially around the vertical axis of the skateboard. Consequently, the first bearing and / or the third bearing are arranged in front of or behind the rotation element in the longitudinal direction.

[0022] A skateboard axle according to the invention for a skateboard with a board comprises at least one skateboard suspension according to the invention and at least one rotation element designed to enable rotation of the skateboard suspension on the board. As described above, the use of such a skateboard axle can optimally imitate the motion sequence of surfing on a skateboard with a corresponding axle.

[0023] 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 such that the wheel is at the same height as the longitudinal axis in the direction of the skateboard's transverse axis. The second elastic element can also provide a force when cornering, which helps the athlete transform a cornering motion into a straight-line motion and then into a curve in the opposite direction.

[0024] The second elastic element is preferably designed as a spring, particularly a torsion spring. As already mentioned, springs are widely used, inexpensive components available in various, clearly defined strengths and sizes. They also offer a long service life with low wear, making them ideal as an elastic element. Springs can be easily integrated into the bearing structure, thus contributing to a compact design of the skateboard axle. It is particularly preferred if the spring is preloaded and the preload can be adjusted.

[0025] Furthermore, an embodiment of the skateboard axle is preferred 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.

[0026] In an advantageous embodiment of the invention, the axis of rotation of the rotating element, and thus of the skateboard's suspension on the board, is set at a specific angle to the board's vertical axis. Thus, the axis of rotation does not coincide with the vertical axis. By setting the axis of rotation relative to the vertical axis, the skateboard's riding characteristics can be adjusted and adapted to personal preferences. Furthermore, setting the axis of rotation relative to the vertical axis creates a restoring moment, which moves the skateboard's axis back toward the zero position, i.e., the neutral position without cornering, during riding. The best riding characteristics have been achieved with an angle of setting relative to the vertical axis between 15 and 40 degrees.

[0027] In a further advantageous embodiment of the skateboard axle according to the invention, the rotation element has a fastening section and a rotation section, wherein the fastening section is fixedly, i.e. immovably, connected to the board and the skateboard suspension is attached to the rotation section by means of the connecting element. Furthermore, in this embodiment, the rotation bearing for implementing the rotation between the skateboard suspension and the board is provided between the fastening section and the rotation section. Such a design has the advantage of a simple geometry, wherein the position of the wheel 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 adjust the position of the wheel 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.

[0028] The skateboard according to the invention has at least one skateboard axle according to the invention. The skateboard axle is provided 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:

[0029] Fig. 1a Surfskateboard 1 according to the prior art in a view from below

[0030] Fig. 1b Surfskateboard 1 according to Fig. 1a in a front view

[0031] Fig. 2a schematic representation of a first embodiment of a surfskateboard 1 according to the invention in a perspective view from below

[0032] Fig. 2b schematic representation of the surfskateboard 1 according to the invention according to Fig. 2a in a side view

[0033] Fig. 3 Representation of a surfskateboard 1 according to the invention in a second embodiment in a perspective detailed view

[0034] Fig. 4 schematic representation of another embodiment of the skateboard 1 according to the invention with the skateboard suspension 10 according to the invention.

[0035] Figs. 1a and 1b were already described in detail in the explanation of the prior art. Therefore, a repeated description is omitted here.

[0036] 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. The axes (longitudinal axis y, transverse axis x, vertical axis z) of a surfskateboard 1 already defined with regard to Figs. 1a and 1b also apply to Figs. 2a, 2b, and 3.

[0037] The surfskateboard 1 according to the invention, as shown in Figs. 2a and 2b, has a conventional skateboard axle 20 according to the prior art with two wheels 30 attached thereto 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 arm 14 is connected to the connecting element 11 via a first bearing 12, with a roller 30 arranged on the rocker arm 14, which roller can rotate about a horizontal axis via a corresponding roller suspension on the rocker arm 14. 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 attachment position of the skateboard axle 10 on the board 40. The roller 30 is therefore arranged downstream of the attachment position.The skateboard suspension 10 further includes a connecting element 11, which is connected to the rotating element 50. The rotating element 50 is connected to the board 40 and includes a second bearing 53.

[0038] The first bearing 12 enables rotation of the rocker arm 14 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, strictly speaking moves on a circular path around the first bearing 12 of the rocker arm 14, it also performs a vertical movement within the meaning 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 arm 14. If the roller 30 is therefore deflected from the zero position shown in the vertical direction, the first elastic element 15 applies a force or a moment opposite to this deflection to the rocker arm 14, which attempts to bring the rocker arm 14 and the roller 30 back to the zero position.

[0039] 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 cushioned by a second elastic element 54, which, during a horizontal rotational movement of the skateboard suspension 10 from the illustrated zero position, applies a force or moment that counteracts this movement.

[0040] The movement sequence for steering the surfskateboard 1 corresponds to the movement sequence for using conventional surfskateboards already explained above with regard to the state of the art. If the athlete shifts their center of gravity from the longitudinal axis y along the transverse axis x, a rolling movement of the board 40 about the longitudinal axis y is also generated. This rolling movement is accompanied by a horizontal rotation of the rocker arm 14 about the second bearing 53 and thus by a deflection of the roller 30 of the skateboard axle 10 from the longitudinal axis y. The surfskateboard 1 is thus forced into cornering. The surfskateboard 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 surfskateboard 1 can tip slightly.The athlete must therefore maintain balance when cornering under the influence of centrifugal and weight forces, similar to surfing.

[0041] Unlike conventional surfskateboard designs 1, the athlete is able to perform a pumping motion by shifting their center of gravity along the vertical axis z using a movement similar to a squat, which is cushioned by the first elastic element 15. The pumping motion is therefore a movement of the athlete on the board by which they move their 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. Thus, by lowering their center of gravity, the athlete can compress the first elastic element 15 when entering the curve and, while cornering, use the energy stored in the first elastic element 15 by raising their center of gravity again. The lowering and raising of the center of gravity thus describes the pumping motion.This provides a supportive effect when stretching the body to vary the moment of inertia, as well as a beneficial and easily adaptable rhythm. Another advantageous aspect is that cornering for acceleration with the surfskateboard 1 described here works effectively with different frequencies and curve radii. This ensures an authentic surfing experience at different speeds and curve radii.

[0042] Fig. 3 shows a perspective detailed view of a surfskateboard 1 according to the invention in a second embodiment. Shown is a board 40 with a skateboard axle 20, which is composed of a skateboard suspension 10 and a rotating 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. The skateboard suspension 10 and the rotating element 50 together form a skateboard axle 20. In the illustrated configuration, the skateboard axle 20 is in the neutral position.

[0043] Furthermore, the skateboard suspension 10 has a rocker arm 14 with a fork 141, which is connected on the fork 141 side to a sliding ring 142 and on the opposite side to the connecting element 11. Furthermore, a roller suspension 31 is provided on the rocker arm 14. In the roller suspension 31, a roller axis 311 is provided, which is arranged horizontally in the neutral position of the skateboard axis and rotatably supports a roller 30. In other words, the roller axis 311 lies in a plane spanned perpendicular to the rotation axis of the rotating element 50. Between the roller suspension 31 and the connecting element 11, a rigid connecting rod is provided, on the longitudinal axis of which the sliding ring 142 is movably arranged. Between the sliding ring 142 and the connecting element 11, a first elastic element 15 in the form of a spring is provided, which winds around the connecting rod.A lower limit stop 16 of the spring is arranged along the longitudinal axis of the rigid connecting rod and is adjustable, for example, by means of a thread on the rigid connecting rod. By changing the position of the lower limit stop 16, the preload of the spring can be adjusted.

[0044] The rocker arm 14 in the illustrated embodiment 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 assembled component. Furthermore, other possibilities for providing an elastic element are also conceivable, for example, by providing a torsion spring at the attachment point between the rocker arm 14 and the connecting element 11. Furthermore, the rigid connecting rod can be omitted if the fork 141 of the rocker arm 14 is connected directly to the roller suspension 31.

[0045] In the embodiment of Fig. 3, the rotation element 50 has a fastening section 51 and a rotation section 52, wherein the fastening section 51 fastens the skateboard axle 20 as a whole to the board 40 and the rotation section 52 is fastened to the connecting element 11. The fastenings of the fastening section 51 to the board 40 and of the connecting element 11 to the rotation section 52 are effected by screw connections in the embodiment shown, but other forms are also conceivable. Between the rotation section 52 and the fastening section 51, a second bearing 53 is provided, 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 when it rotates in the direction of the zero position shown.

[0046] When the surfskateboard 1 is loaded by the weight of the athlete, a vertical movement of the roller 30 occurs, which is made possible by the rotation of the rocker arm 14 about the first bearing 12. To do this, the rocker arm 14 rotates about its attachment to the connecting element 11 and, in doing so, compresses 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, causing the roller 30 to experience a vertical movement that is cushioned by the spring. Using the adjustable lower limit 16, the preload of the spring and thus the force required for a specific deflection of the roller can be adjusted.

[0047] If the athlete performs the pumping movement described above, this results in the distance between board 40 and roller 30 constantly varying according to the pumping movement. This movement is supported by the first elastic element 15. A weight shift from the longitudinal axis y towards the transverse axis x causes a rotation of the rotation element 50 and thus of the skateboard suspension 10 on the board 40, forcing the skateboard 1 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 thereby causes a force counteracting the rotation of the skateboard suspension 10 and thus helps the rider to transform the cornering into a straight-line movement and finally into an opposite cornering movement, thus accelerating the skateboard 1.

[0048] Fig. 4 shows a further embodiment of the skateboard 1 according to the invention with the skateboard suspension 10 according to the invention. This embodiment largely corresponds to the embodiment shown in Figs. 2a and 2b, which is why only the differences between the embodiments will be discussed here. For further details, please refer to the explanations regarding Figs. 2a and 2b.

[0049] Firstly, 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 one another in the x-direction, i.e. concentrically, and connected to a common axis. The axis is firmly connected to the swing arm 14 and can, for example, be formed with the swing arm 14 as a single component, i.e., in one piece. For reasons of clarity, the front roller 30 in the plane of the drawing is represented by dashed lines. As in the embodiment according to Fig. 2a, a first bearing 12 is provided between the connecting element 11 and the rocker arm 14, which enables rotation of the rocker arm 14 and thus of the rollers 30 about 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 exerts a force on the rocker arm 14 that is directed to bring it into an initial position.The force exerted by the elastic element 15 upon deflection from the initial position thus counteracts the movement. The first elastic element 15 can be supported against the board 40, as in the embodiment shown in Fig. 2a, or against the connecting element 11, as shown in Fig. 4.

[0050] In general, in addition to elastic elements, damping elements can also be provided, which dampen a corresponding movement on the bearings and thus remove energy from the movement.

[0051] Furthermore, in contrast to the embodiment according to Fig. 2a, the connecting element 11 is angled, wherein the angle is designed such that a part of the connecting element 11 is oriented rearward 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 term "angled" is to be understood such that the connection to the rocker arm 14 is shifted in the direction of the longitudinal axis y in the undeflected state compared to the connection point between the connecting element and the board. In a structurally simple case, this can be achieved by a connecting element 11 designed as an angle.

[0052] Furthermore, a third bearing 13 is provided within the connecting element 11, which enables a rotation of the two parts of the connecting element 11 connected by the third bearing 13 essentially about the longitudinal axis y of the surfskateboard 1 in the undeflected state. "Essentially about the longitudinal axis y of the surfskateboard 1" is understood to mean a rotation whose axis of rotation deviates from the longitudinal axis y of the surfskateboard 1 by a maximum of 60 degrees in the undeflected state of the surfskateboard 1. 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 returns it to its original position as soon as the deflecting force ceases.The angled connecting element provides an offset in the longitudinal direction y of the surfskateboard 1 between the rotation element 50 and the third bearing 13 in the undeflected state. The angled connecting element 11 is merely one possibility for creating this offset, and the invention is not limited thereto.

[0053] 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, wherein the third bearing 13 then enables rotation substantially about the longitudinal axis of the rocker arm 14. Furthermore, in a further embodiment, the third bearing 13 can be provided between the board 40 and the connecting element 11. It is also conceivable to provide the first bearing 12 and the third bearing 13 as a bearing with the respective corresponding degrees of rotational freedom. 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.

[0054] A third bearing 13 can be understood as any bearing that enables rotation of the rocker arm 14 or a part of the rocker arm 14 or of the connecting element 11 (in the case of positioning between the board and the connecting element) about an axis that deviates from the longitudinal y-axis of the skateboard by less than 60 degrees in any possible deflection position. It thus provides a rotational degree of freedom in every possible position during cruising, which vectorially contains a y-component (longitudinal direction of the skateboard) in the global coordinate system. By providing three bearings, their rotation axes thus span a 3-dimensional space and are vectorially linearly independent of each other.

[0055] 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.

[0056] LIST OF REFERENCE SYMBOLS

[0057] 1 surfskateboard

[0058] 10 Skateboard suspension

[0059] 11 Connecting element

[0060] 12 first storage

[0061] 13 third storage

[0062] 14 rocker arms

[0063] 141 Fork

[0064] 142 sliding ring

[0065] 15 first elastic element

[0066] 16 lower limit

[0067] 20 skateboard axles

[0068] 30 rolls

[0069] 31 Roller suspension

[0070] 311 Axis

[0071] 40 boards

[0072] 50 rotation element

[0073] 51 fastening section

[0074] 52 rotation section

[0075] 53 second storage

[0076] 54 second elastic element x transverse axis y longitudinal axis

[0077] vertical axis

Claims

PATENT CLAIMS 1 .Skateboard suspension (10) for attachment to a rotation element (50) of a skateboard (1) with a board (40), wherein the rotation element (50) is designed to enable rotation of the skateboard suspension (10) on the board (40) about a rotation axis, comprising the skateboard suspension (10), a connecting element (11) designed to attach the skateboard suspension (10) to the rotation element (50) at a fastening position, at least one rotatably mounted roller (30), wherein the roller (30) is mounted downstream of the rotation axis of the rotation element (50) on the board (40), a rocker arm (14) to which the roller (30) is attached and which is attached to the connecting element (11) by means of a first bearing (12), wherein the first bearing (12) of the rocker arm (14) is provided in such a way that it enables vertical movement of the at least one roller (30), wherein the vertical movement is first elastic element (15) is sprung.

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, wherein the preload of the spring is 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), comprising 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 a rotation axis. Skateboard axle (20) according to the preceding claim, wherein the rotation element (50) has a second elastic element (54) designed to provide a force counteracting said rotation in the event of 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 rotation axis of the skateboard suspension (10) on the board (40) is set at a specific angle, in particular an angle between 15 and 40 degrees, to a vertical axis (z) of the board (40). Skateboard (1) comprising 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.

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