WO2020228915A1

WO2020228915A1 - Fin-coupling device for fastening a fin to a surfboard

Info

Publication number: WO2020228915A1
Application number: PCT/DE2020/200036
Authority: WO
Inventors: Raoul GEBURZKY
Original assignee: Geburzky Raoul
Priority date: 2019-05-16
Filing date: 2020-05-14
Publication date: 2020-11-19
Also published as: DE112020002434A5; DE102019112970A1

Abstract

The invention relates to a fin-coupling device for fastening a fin to a surfboard base, comprising a surfboard-connecting element, a first fin-connecting element and a second fin-connecting element, the fin-coupling device being designed in the form of a fin deflection mechanism so that, when in use, the fin is deflected and the angle of incidence is changed when a force acts transversely upon the fin and the fin is returned to an initial position when there is no force acting transversely upon the fin.

Description

Fin coupling device for attaching a fin to a surfboard

The invention relates to a fin coupling device for attaching a fin to a surfboard body with a joint device, a repositioning device, a first surfboard connection element and a first fin connection element.

[02] Fin fastenings are known from the prior art, which connect a fin firmly and immovably to the surfboard body. This can be done, for example, by screwing. An immovable fin has the advantage that it enables the surfboard to move in a stabilized direction on the water. At the same time, immobile fins lead to impaired maneuverability, since they prevent lateral movement, making it difficult to drive around corners. Finns with a flexible angle in relation to the surfboard, on the other hand, would tilt themselves through a change of direction or random turbulence, so that if they continued to move forward, they would lead to a change of direction and to braking. Alternatively, changes in the angle of the fin are possible due to the flexibility of the material of the fin and the resulting torsion itself, but this reduces the control over an axis of rotation.

[03] WO 2012/009 753 A1 describes a fin assembly for controlling the movement of a floating body discloses comprising: a base for securing the assembly to the body; and a fin hinge attached to the base, wherein when the assembly is attached to the body, the fin is pivotable on the hinge from a first state to a second state for substantially free rotation of the body in FIG to enable a first direction of rotation. However, the hinge only allows rotation about a longitudinal axis of the surfboard.

US Pat. No. 5,070,804 A relates to an aligning fin with variable flow, in which two springs allow the fin to be returned to the center position and a symmetrical, flexible fitting interrupts the outward vibrations and facilitates the return of the fin to the center. The device is intended to facilitate maneuvers of a surfboard. However, the hinge only allows rotation about a transverse axis of the surfboard.

US 5 813 890 A describes a fin assembly for attachment to a lower surface of a watercraft hull comprising a base for attachment in a fixed position to the lower surface of a watercraft hull, the base having pivot pin receiving bores which have a hinge function Define a hinge axis, a fin with an inner end having second pin receiving bores for pivotal attachment to the base for pivoting about the hinge axis, and a hinge pin mounted in the first and second hinge receiving means and pivotally connecting the fin to the base, and a elastomeric element disposed between the base and the fin to resist pivotal movement of the fin relative to the base. However, the hinge only allows rotation about a transverse axis of the surfboard.

[06] The object of the invention is to improve the state of the art.

The object is achieved by a fin coupling device for attaching a fin to a surfboard body with a hinge device, a repositioning device, a first surfboard connecting element and a first fin connecting element, the hinge device having a first hinge element and a second hinge element and the first hinge element in the installed state is connected to the surfboard by means of the first surfboard connection element and the second joint element is connected to the fin by means of the first fin connection element, so that a flexible coupling is established between the surfboard and the fin and the joint device acts as an axis of rotation when the fin is deflected in relation to the surfboard body, with the repositioning device is connected directly or indirectly to the fin and is designed in such a way that in the operating state the fin is deflected by a transversely acting force in the absence of the qu he acting force is repositioned to a starting position, characterized in that the first joint element and the second joint element are spatially movable relative to one another to a limited extent. [08] Thus, in the installed state, the fin coupling device can provide a fin which can change its position when cornering. The changed position changes the angle of attack, which reduces the risk of a stall and improves the maneuverability of the surfboard. In the event of a subsequent rectilinear movement of the surfboard, there is an absence of the transversely acting force on the fin, so that the fin is repositioned in a starting position. By repositioning the fin when the surfboard moves in a straight line, a straight movement of the surfboard supported by the fin is made possible.

[09] The fin coupling device can thus enable an optimized angle of attack for the fin and thus an optimized maneuverability of the surfboard both when driving in a straight line and when cornering.

A core of the invention lies in the fact that the fin of a surfboard is in a rest position in the installed state during operation and is deflected from this rest position by forces acting on the fin. In the absence of deflecting forces, the fin is in the rest position or is returned to the rest position. In this way, in contrast to an immovably mounted fin, the angle of attack of the fin can be readjusted when the water is not flowing in frontally. The readjustment can influence the flow behavior of the water around the fin and counteract a stall. With a straight forward movement, however, the fin can continue to help stabilize the surfboard. For example, the maneuverability of the surfboard when cornering can be improved without reducing the speed when moving forward.

[12] The joint device for the limited mobility of the fin relative to the surfboard body can limit the direction in which the fin is deflected when a force is applied. While an elastically deflectable fin deflection device can be deflected translationally as well as around any axis of rotation by a force in relation to the original position, the deflection can be limited to a single axis of rotation by means of a joint device. Depending on the choice of the joint device, however, a restriction to two or three axes of rotation is also possible.

[13] With an axis of rotation arranged on the front of the fin in the direction of travel, the fin can rotate transversely to the acting force if the fin is not rotated completely. With an axis of rotation arranged on the front side in the direction of travel, the fin can rotate in a longitudinal direction in relation to the force applied when there is an acting force and an incomplete rotation. In order to reduce the risk of a stall, the hinge device is attached to the front of the fin in the direction of travel. In the alternative mentioned, the joint device is also attached to the front of the fin in the direction of travel in order to Prevent deflection of the fin during linear movement of the surfboard.

[14] The following terms should be explained:

[15] A “surfboard body” is in particular that part of the surfboard which gives the surfboard buoyancy when the surfboard is in operation and which is essentially horizontal to the surface of the water in operation.

[16] A "fin" can be a component of the surfboard that protrudes into the water and serves to maintain directional stability. For this purpose, a fin can protrude into the water along a direction of forward movement.

[17] A "surfboard" is, for example, a vehicle for locomotion on water, which overall has a lower density than water.

[18] The “surfboard connection elements” can each mechanically rigidly connect the fin coupling device to the surfboard. A surfboard connection element can be, for example, an adhesive point, a surface for a weld seam or an opening for a screw connection.

[19] The “fin connection elements” in particular each connect the fin mechanically rigidly to the fin coupling device. The fin connection element can be, for example, an adhesive point, a surface for a weld seam or an opening for a screw connection. The "fin deflection device" consists, for example, of various elements or areas that are elastically movable with respect to one another. This can allow the fin and the surfboard body to be moved elastically with respect to one another, although the fin is mechanically rigidly connected to the fin coupling device and the surfboard body is mechanically rigidly connected to the fin coupling device.

[21] "Elasticity" is understood here to mean in particular the property of a body to change its shape when the force is applied and to return to its original shape when the force is no longer present. Elastic objects are for example springs or objects made of rubber.

The deflecting components of the fin coupling device, in particular the joint device and the return device, can in principle be arranged both in the fin, in the surfboard body and / or between the fin and the surfboard body.

In a further embodiment, the joint device is designed as a ball joint. This enables the fin to move about three axes during operation. This makes it possible, in particular, for the fin to adapt to the movement even when the surfboard body is inclined at an angle and a stall is avoided.

In order to modify the maneuvering properties of the surfboard, the articulation device has such a device arranged attachment point on that the rotatability of the joint device is limited on two axes. Thus, the rotatability of the fin is advantageously restricted to two axes by a stop point from a desired angle of rotation.

By restricting the rotatability of the fin to a desired range, the maneuvering properties of the surfboard can be modified in a desired manner.

[26] Furthermore, the attachment point or attachment points can prevent larger deflections which expose the fin to such great forces that the fin is damaged. The attachment points can thus serve as a safeguard, while at the same time no restriction is caused in an area of uncritical deflection angles.

[27] In order to introduce a lever effect, the joint device and the repositioning device are spaced apart along the fin in the installed state.

By the articulation device and the repositioning device being spaced apart longitudinally along the fin, a leverage effect can advantageously result. This enables the spring element in particular to apply increased forces to the fin so that repositioning is facilitated. In a further embodiment, the repositioning device is designed as a spring device, the spring device having a spring element, so that the repositioning takes place at least partially by means of the spring element. In particular, this enables a constant tensile force for repositioning.

In a further embodiment, the fin deflection device has a spring device, the spring device having a spring element and a spring holder and, in the installed state, the hinge device and the spring device being arranged lengthways along the fin and the spring element mechanically and elastically connecting the spring holder and the second fin connecting element so that the repositioning takes place by means of the spring element.

[31] The spring element can thus provide a second connection point between the surfboard body and the fin. In particular, this results in improved mechanical stability. Furthermore, the connection of surfboard and fin by means of the spring element, which has an elastic effect, can result in an elastic repositioning of the fin in an initial position. The joint device and the spring device are preferably connected to two opposite ends of the fin.

In particular, a tension spring or a compression spring can be used as the spring element. By using A spring as the spring element can advantageously result in a deflection of the fin which is proportional to the force acting on the fin. The size of the deflection can be influenced by choosing a spring strength of the spring element.

[33] Furthermore, repositioning about a further axis can take place by using a second spring element or further spring elements. As a result, the fin can be repositioned from an inclined position in relation to the surfboard body.

[34] In a further embodiment, the spring element is designed as a compression spring to allow tensile and compressive loads.

[35] Compression springs can enable a spring effect under both pressure and tensile loads. This advantageously results in a spring action in different spatial directions.

If a second compression spring is used in the opposite direction to a first compression spring, one compression spring is subjected to tensile loading when the fin is deflected, while the other compression spring is subject to compression. This results in an advantageous combination of a spring strength of both springs.

[37] In a further embodiment, the spring device has a spring holder, the spring holder being designed as a recess. Thus, the spring element is in particular in a space provided for it attached. This space can, for example, be a bore in the fin coupling device. The use of a recess as a spring holder has the advantage that longer springs can be used. This enables a longer spring travel.

To connect the fin coupling device to the fin, the first fin connection element is configured as a screw connection and / or the second fin connection element is configured as an eyelet.

[39] Thus, the fin can be connected to the second joint element by means of a screw connection and the spring element can be connected to the fin by means of the eyelet.

[40] A connection between the spring element and the eyelet can be made using a hook. The connection between the spring element and the eyelet can continue to take place on the basis of the topology of the elements, that is, for example, that the spring element is pulled through the eyelet and is attached to the fin coupling device at both ends. The screw connection realizes a particularly firm connection, with the eyelet advantageously enabling quick assembly.

In a further aspect, the object is achieved by a fin with a fin deflection device described above.

[42] This results in the advantages mentioned above when the fin deflection device is connected to a surfboard body. In a further embodiment, the fin deflection device has a second fin connecting element and / or a second

Surfboard connection element, wherein during operation the repositioning device is connected to the fin by means of the second fin connection element and / or the repositioning device is connected to the surfboard by means of the second surfboard connection element, so that a connection can be established at at least two points between repositioning device and fin and / or between repositioning device and surfboard is.

[44] This enables fastening at two points and thus greater stability.

[45] In a further aspect, the object is achieved by a surfboard body with a previously described fin deflection device. This results in the above-mentioned advantages when the fin deflection device is connected to a fin.

[46] The connection between the surfboard body and the fin deflection device can be implemented by means of an adhesive connection. For this purpose, the surfboard body and the fin deflection device can each have an adhesive surface. The connection between the surfboard body and the fin deflection can also be implemented by means of a screw connection. For this purpose, the fin deflection device can have an external thread which is screwed into an internal thread of a sleeve. This sleeve can be glued to the surfboard body by means of adhesive surfaces. This type of connection has the advantage that the fin deflection device can be easily dismantled and separated from the surfboard.

[47] The Finnenauslenkeinrichtung can be composed of a mechanically coherent unit, as well as a plurality of units exist, which do not directly mechanically usammenhängen _Z. For example, the joint device and the spring device can be connected directly to the surfboard, but not directly to one another. In this case, in the installed state, there is an indirect connection between the spring device and the joint device through the surfboard body. In this case, material can advantageously be dispensed with and the fin deflection device can be implemented in a weight-saving manner.

In a further aspect, the object is achieved by a surfboard which has a previously described fin, a previously described surfboard body and a previously described fin deflection device.

[49] Through the connection of surfboard, fin, surfboard body and a fin deflection device, the fin can be deflected by the force of a lateral flow when the surfboard is in operation when the surfboard moves at an angle, for example when driving a curve, whereby the angle of attack is changed, and in the absence of the force, the fin can be repositioned in the starting position, whereby at straight forward movement the fin helps stabilize the surfboard.

In a further aspect, the object is achieved by a surfboard with two fin deflection devices in accordance with the description above. In one embodiment, the fin deflection devices are arranged along or parallel to the longitudinal axis of the surfboard.

[51] By regularly pivoting the surfboard along the fin deflection devices, propulsion can in particular be generated. The pivoting is expressed, for example, as a sinusoidal movement at each fin deflection device which is generated by a user. The fins, which are partially pivoted about the axis of rotation, resist the movement, as a result of which the fin generates propulsion analogously to a submerged paddle. The fin placed at an angle to the direction of movement can therefore be used to generate propulsion, while the other one, on the other hand, is oriented parallel to the direction of movement and, for example, is pulled. The sinusoidal movement of the two fin deflection devices is offset to one another; a fin deflection device is thus given away, for example, when the other fin deflection device is currently in the starting position.

[52] Due to the fin deflection devices, the surfboard has a function similar to a wave board and can be used for locomotion. By swinging the surfboard back and forth (pivoting), propulsion can thus be generated.

[53] In one embodiment, the surfboard has a division along a transverse axis, the two surfboard halves thus created being connected by a joint, creating a greater resemblance to a wave board.

[54] The invention is explained in more detail below using an exemplary embodiment. Show it

Figure 1 is a schematic representation of a

Surfboard, which contains two rigid fins, a movable fin, a surfboard body and a fin deflection device in a plan view from above and

Figure 2 is a schematic, two-dimensional

Exploded view of the fin deflection device with fin and a section of the surfboard in a side view.

[55] On a surfboard 100, two rigid fins 101 and, further on, a movable fin 102 are attached parallel to the underside of a surfboard body 103 in the direction of travel. The rigid fins 101 are connected to the surfboard body 103 by means of substantially immobile fasteners. The movable fin 102 is with connected to the surfboard body 103 by means of a movable fin deflection device 111.

The fin deflection device 111 is mechanically rigidly connected to the surfboard body 103 by means of an adhesive surface 105. The fin deflection device 111 for changing an angle of attack has a ball joint 113, which serves as an axis of rotation, and a spring device 119.

The ball joint 113 consists of a joint socket 115, a joint head 117 and a joint screw 129. The joint head 117 sits in the joint socket 115, so that the movable fin 102 can be rotated about three axes. The joint screw 129 is screwed into the joint screw hole 107, so that there is a mechanically rigid connection between the joint head 117 and the movable fin 102.

The spring device 119 consists of a compression spring 121 with a hook 127 and a spring screw 123. The spring screw 123 is screwed into the spring screw hole 125 so that there is a mechanical connection between the surfboard body 103 and the spring device 119. The hook 127 is hooked into the eye 109. The spring element results in an elastically movable connection between the surfboard body 103 and the eyelet 109.

[59] When the surfboard 100 is in operation, there is no deflection of the movable fin 102 when the surfboard moves forward in a straight line Movement of the surfboard, that is to say when driving a curve, flows against the movable fin 102 at a lateral angle. This results in a force acting transversely on the movable fin 102. The movable fin 102 is deflected by the force acting on the ball joint 113. The spring element allows this movement, but at the same time offers resistance.

[60] The deflection of the movable fin 102 changes an angle of attack of the movable fin 102, so that the probability of a stall is reduced.

[61] Part of a deformation work done by the compression spring 121 is stored as a distortion energy in the compression spring 121. As soon as the surfboard 100 moves in a straight line again, the transversely acting force on the movable fin 102 disappears. The distortion energy stored in the compression spring 121 now brings the movable fin 102 back into the starting position by contracting the compression spring 121. As a result, the movable fin 102 again assumes the angle of attack which is optimal for linear operation.

List of reference symbols

101 rigid fin

102 movable fin

103 surfboard body

105 adhesive surface

107 pivot screw hole 109 eyelet

111 Fin deflection device 113 Ball joint

115 socket

117 rod end

119 spring device

121 compression spring

123 spring screw

125 spring screw hole

127 hooks

129 joint screw

Claims

Patent claims:

1. Fin coupling device for attaching a fin to a surfboard body with a hinge device, a repositioning device, a first

Surfboard connector and a first

Fin connecting element, the joint device having a first joint element and a second joint element and, in the installed state, the first joint element by means of the first

Surfboard connection element with the surfboard and the second joint element by means of the first

Fin connecting element is connected to the fin, so that a flexible coupling is established between the surfboard and the fin and the joint device acts as an axis of rotation when the fin is deflected in relation to the surfboard body, the repositioning device being connected directly or indirectly to the fin and configured in such a way that in the operating state the fin is repositioned to a starting position after a deflection of the fin by a transversely acting force in the absence of the transversely acting force, characterized in that the first joint element and the second joint element are spatially movable relative to one another to a limited extent.

2. Fin deflection device according to claim 1, characterized in that the joint device is designed as a ball joint.

3. Fin deflection device according to one of the previous ones

Claims, characterized in that the

Joint device has a stop point arranged in such a way that the rotatability of the joint device is restricted on two axes.

4. Fin deflection device according to one of the previous ones

Claims characterized in that in the installed state the joint device and the

Repositioning means are spaced longitudinally along the fin.

5. Fin deflection device according to one of the previous ones

Claims characterized in that the

The repositioning device is designed as a spring device, the spring device having a spring element, so that the repositioning takes place at least partially by means of the spring element.

6. Fin deflection device according to claim 5, characterized in that the spring element is designed as a compression spring, as a leaf spring, or as an elastomer.

7. Fin deflection device according to one of claims 5 or

6 characterized in that the spring device has a spring holder, the spring holder as

Recess is designed.

8. Fin deflection device according to one of the previous ones

Claims, characterized by a second

Fin connecting element and / or a second

Surfboard connecting element, wherein the repositioning device by means of the second

Fin connecting element is connected to the fin and / or the repositioning device is connected to the surfboard by means of the second surfboard connecting element, so that a connection at at least two points between repositioning device and fin and / or between repositioning device and

Surfboard can be produced.

9. Fin deflection device according to claim 8, characterized in that the first fin connecting element as a screw connection and / or the second

Fin connecting element is or are designed as an eyelet, in particular as a form-fitting and force-fitting connection.

10. Fin having a fin deflection device according to one of the preceding claims.

11. Surfboard body, which has a fin deflection device according to one of claims 1 to 9.

12. Surfboard, which has a fin, a surfboard body and a fin deflection device according to one of claims 1 to 9.

13. Surfboard with two fin deflection devices according to one of claims 1 to 9.