Water sport device, in particular a foilboard

Abstract

The invention relates to a water sport device, in particular a foilboard, comprising a floating body (4), in particular in the form of a swimming board, and a foil device (6) which is secured to the floating body (4) by means of a retaining device (8), wherein the foil device (6) arranged on a link (110, 11) of the retaining device (8) has at least one, preferably at least two foils (16), and it can be transferred via the retaining device (8) from an idle and / or starting position into an operating position below the floating body (4), wherein, in the operating position and during a forward movement, due to an uplift force caused by the foil device (6), the floating body (4) can be transferred into a position in which is spaced apart from the surface of the water, wherein the retaining device (8) has a drive, which is preferably designed as an electromechanical or electro-pneumatic drive (12), via which the foil device can be transferred, in particular extended and retracted and / or folded, from an idle and / or starting position into the operating position and / or from the operating position into the idle and / or starting position.

Description

[0001] The present invention relates to a water sports device, in particular a foilboard, comprising a float, preferably in the form of a kickboard, and a foil device which is attached to the float by means of a holding device, wherein the foil device arranged on a handle of the holding device has at least one, preferably at least two foils and can be moved from a rest and / or starting position to an operating position below the float via the holding device, wherein the float in the operating position and during a forward movement can be moved into a position spaced away from a water surface due to buoyancy caused by the foil device.

[0002] Such a water sports device is specifically designed as a foilboard, and the buoyancy aid is specifically designed as a kickboard. The at least one hydrofoil device has, in particular, at least two hydrofoils. Such water sports devices are regularly used for the propulsion of persons across bodies of water, who are positioned on the side of the buoyancy aid facing away from the hydrofoil device. During propulsion, the hydrofoil device is typically located below the water's surface.

[0003] German patent DE 10 2015 103 553 A1 discloses a water sports device with a hydrofoil arrangement, also known as a foil, which can fold down against the direction of travel to prevent damage in the event of underwater contact. US patent 2018 / 0072383 A1 further discloses a hydrofoil arrangement that can be moved from a first operating position to another operating position by adjusting the angle of the connecting strut between the float and the propulsion device. Both prior art water sports devices require sufficiently deep water for operation, as the hydrofoil arrangement would otherwise touch the bottom and either be damaged or folded down. For transport, the hydrofoil arrangement is either disassembled or the water sports device must be transported with the hydrofoil arrangement, which typically extends up to one meter, protruding from the body.

[0004] CN 208 760 860 U discloses a floating board and a wing which can be transferred from a folded to an unfolded state by means of a folding mechanism.

[0005] US Patent 3,802,369 A discloses a water sports device on which the user stands and which is operated by means of a handlebar with hand grips. The water sports device has an inflatable, elongated body on which the user stands. A pair of pivoting wings is attached to the body. These wings can be pivoted from a first position, in which they extend elongated parallel to the body and lie close to it, to a second position, in which they extend laterally and downwards away from the body.

[0006] CN 208 715 431 U discloses a complete mechanism in which a lower wing is articulated to a vertical strut.

[0007] US patent 2005 / 109258 A1 discloses a method for controlling the hydrofoils of a boat, which incorporates a regenerative braking system for regulating surfing speed. An energy storage system is connected to the boat's propulsion system.

[0008] The object of the invention is to provide a water sports device that is easier to handle while offering high reliability.

[0009] The problem is solved by an object according to claim 1. Advantageous embodiments of the invention can be found in the dependent claims relating thereto and in the following description.

[0010] According to the invention, the holding device has a drive, preferably designed as an electromechanical or electro-pneumatic drive, by means of which the foil assembly can be moved from a rest and / or starting position to the operating position and / or from the operating position to the rest and / or starting position, in particular by being retractable and / or foldable. The actuation can be performed manually by a person operating the water sports equipment, with the advantage of easier transportability of the water sports equipment compared to conventional foilboards in the rest or starting position of the foil assembly close to, or at least partially within, the buoyancy chamber. In particular, the water sports equipment can be lowered into water close to the shore or beach, even at knee depth, and guided or driven towards deeper water.Once sufficiently deep water is reached, the hydrofoil assembly can be moved by means of the drive mechanism into the operating position, where it is further away from the float. This process can occur automatically upon reaching a predefined or set water depth, or by the user of the watercraft.

[0011] The transition to the rest and / or start position can also occur via intermediate positions in which the wing arrangement is not as close to the buoyancy chamber as in the rest and / or start position. To trigger the actuation, the drive is equipped with a control unit that receives a signal from a user or automatically generates such a signal, e.g., based on sensor information, and sends a control signal to the drive.

[0012] The drive is preferably designed as an electromechanical or electropneumatic drive. The drive energy is preferably supplied by a motor, electromechanically, or electropneumatically. An electropneumatic drive has electrically powered components for adjusting pneumatic actuators. In particular, compressed air is controlled by electrical signals. Electromechanical drives are characterized by the generation of mechanical processes, such as the rotation of a shaft, by an electrically driven motor. These drive types ensure a low susceptibility to failure of the water sports equipment.

[0013] According to the invention, the drive is thus equipped with an electric motor, the drive energy of which is used to move the wing device.

[0014] The float is, in particular, a flat, elongated body whose density is significantly lower than that of water. The float is designed such that, during operation, it is preferably positioned at least partially above the water's surface, regardless of the speed of travel. During operation, the holding device extends from the float to the hydrofoil assembly located below the float. A buoyant force generated by the hydrofoil assembly is transferred to the float by the holding device.

[0015] In the rest and / or launch position, the hydrofoil assembly is positioned closer to the hull than in the operating position to improve the compactness of the watercraft. Specifically, the holding device for moving the hydrofoil assembly into the rest and / or launch position is folded and / or retracted. In particular, the at least one first linkage for moving the hydrofoil assembly relative to the hull is pivoted by at least 20°, preferably at least 40°, and most preferably at least 80°. Preferably, in the rest and / or launch position, the hydrofoils are no more than 50 cm apart from the hull in a side view.

[0016] The at least one linkage is designed, in particular, as a rigid strut. Specifically, the linkage is pivotally mounted relative to the float and / or relative to the wing assembly. Alternatively or additionally, the at least one, first linkage is translationally movable, in particular slidably mounted, relative to the float and / or relative to the wing assembly. The wing assembly is coupled, in particular indirectly, via other components such as linkages, or directly to the first linkage. A linkage is generally defined as a movable and, in particular, pivotally connected, but otherwise rigid, component, such as a solid or hollow rod, by means of which, optionally in combination with one or more other linkages, parts of the watercraft can be moved relative to each other. Preferably, the mounting device has components that are pivotable relative to each other and / or slidable within or against each other, and thus, for example,telescopic handlebars.

[0017] The hydrofoil device is preferably equipped, at least in its operating position, with at least one hydrofoil, which is flat and preferably at least partially wing- or fin-shaped. The width of the hydrofoil device, measured transversely to the direction of travel, is in particular at most twice the width of the floating body. The hydrofoil device serves to stabilize the movement of the watercraft and to generate lift. To enhance these effects, the hydrofoil device preferably has lateral hydrofoil tips that are angled relative to the essentially flat water surface. Preferably, to further enhance these effects, the watercraft has a plurality of hydrofoils spaced apart from one another in the direction of travel and / or spaced at varying distances from the floating body.The wing device thus comprises at least one wing and its mounting, as well as, if applicable, a propulsion device.

[0018] Preferably, the drive unit includes an energy storage device, particularly for storing mechanical energy, which provides the energy necessary for extending, retracting, or folding the handlebars when released. For example, the storage device comprises a battery for storing electrical energy, a tank for storing a pressurized fluid, or, in particular, a mechanical energy storage device such as a spring.

[0019] According to the invention, the energy storage device is designed to supply the electric motor, which initiates the transfer of the wing device.

[0020] In In a non-inventive embodiment, the energy storage device releases stored energy directly, without an intermediate motor, as mechanical or kinetic energy for transfer. In this case, the energy storage device is mechanically coupled to the holding device on the one hand and directly or indirectly coupled to a charging device such as a motor, which is designed to charge the energy storage device, particularly during the use of the water sports equipment.

[0021] In a non-inventive embodiment, the energy storage device comprising at least one spring can be pre-tensioned by means of a drive motor, whereby the energy stored by the spring can be stored without loss during the use of the water sports device. The amount of stored energy corresponds to at least a part, preferably at least all, of the energy required to move the wing assembly from a first to a second end position. At least when actuated, the spring is connected to the linkage of the holding device in such a way that its force can be used, at least partially, to align the linkage.

[0022] According to a non-inventive embodiment, the drive comprises a transmission, in particular designed as a reduction gear, through which a motor of the drive is connected to the energy storage device, in particular such that the quotient of the time required for folding (dividend) and the time required for the associated pre-tensioning (divisor) is less than 1. The combination of motor and transmission allows for better utilization of the available installation space, since the transmission and motor can be designed coaxially and thus better positioned within the limited installation height of a board-like float. Furthermore, the motor can be dimensioned smaller if the torque it delivers is multiplied by the transmission.In particular, this combination allows a mechanical energy storage device to be charged and, especially, pre-tensioned over a specific period of time, enabling it to release its stored energy more quickly to move the hydrofoil assembly. For example, during a journey in shallower water, the energy storage device can be charged over a period of, say, one or two minutes, while then, upon transitioning to deeper water, the energy stored in the energy storage device is used to move the hydrofoil assembly from its rest and / or starting position to its operating position within thirty seconds.

[0023] A particularly compact design is achieved when, according to a further embodiment not based on the invention, the motor, transmission, energy storage device, and / or brake device are arranged coaxially, particularly with a pivot axis of the linkage. Preferably, the motor, transmission, and / or energy storage device, especially in the form of a torsion spring, are arranged coaxially to one another and in a cavity of a pivotable rotating housing, which is directly or indirectly connected to a linkage of the holding device for the purpose of moving the latter. The torsion spring can, in turn, be arranged around the motor and transmission to utilize the available installation space.Its extent is significantly greater, particularly in the transverse direction of a floating body designed as a float board for a foilboard, than in the vertical direction, so that a sufficiently dimensioned torsion or spiral spring, whose length in the direction of a longitudinal central axis is particularly greater than its width, can encompass a comparatively slim motor.

[0024] For the purpose of transferring the energy storage device from a first position to another position and vice versa, according to a further, non-inventive embodiment, the energy storage device, which includes at least one spring, can be pre-tensioned in opposite directions by a motor or motor and gearbox. According to a specific embodiment of the invention, the energy storage device has two springs, which can be pre-tensioned in opposite directions and are preferably arranged on a motor or gearbox shaft with freewheels configured in opposite directions. This allows the motor to pre-tension the two springs, which are configured in particular as torsion or coil springs, one after the other.

[0025] Preferably, the holding device includes a braking device, in particular an electromagnetic or electromagnetically actuated one, which blocks, releases, and / or brakes the movement of the wing device, thus ensuring controlled movement of the wing device. In particular, the braking force can be regulated or adjustable by varying an attractive force depending on the speed of the float and / or the position of the wing or holding device. The control unit includes appropriate means for detecting the position of the wing device or the holding device, e.g., rotary encoders or limit switches, and means for controlling the braking device.an electrical, electromagnetic, hydraulic and / or pneumatic actuator and preferably electrical and / or electronic signal generators that process the information provided by the respective sensors, in particular the speed over ground or against water.

[0026] In the event of a power failure, the braking device is designed such that the movement of the holding device is blocked when power is cut off. This is achieved by pressing a brake disc, brake pad, or other locking component of the braking device against an otherwise movable part, such as the rotating housing, by means of a spring element or other force-generating element.

[0027] Preferably, the wing assembly is oriented in the rest and / or starting position at least approximately identically to the operating position. Relative movement of the wing assembly then results in the most consistent possible influence on the movement of the float. Alternatively, however, the buoyancy and / or water resistance exerted by the wings in the rest and / or operating position is reduced, for example, by a slightly different angular position of the wings. This minimizes the influence of the wing assembly on the float's movement in the rest and / or starting position.

[0028] Preferably, the drive mechanism of the holding device is arranged at least partially, and in particular completely, within a recess of the float. Specifically, the drive has a surface or cover that fits into the surface of the float. This surface is, in particular, located on the underside of the float. This arrangement of the drive makes the water sports device more streamlined and compact, resulting in less resistance and allowing it to be operated in shallower water.

[0029] The holding device preferably has at least one further link. In particular, the first link and the further link are arranged one behind the other in the direction of travel, at least in the operating position of the wing assembly. Alternatively or additionally, the first link and / or the second link are pivotably arranged, in particular, on the float and / or on the wing assembly or on a unit or receptacle rigidly connected thereto. In particular, at least one of the links is pivotably arranged on a receptacle for the at least one wing assembly or on a receptacle of the wing assembly. The pivot axes are oriented, in particular, transversely to the direction of travel and parallel to the water surface during operation.This allows the holding device to be designed as a parallelogram guide, which is particularly reliable and ensures that the support device remains below the float, especially in the rest and / or starting position.

[0030] Alternatively or additionally, the holding device preferably comprises further linkages, each coupled to one of the two linkages and, at least in the operating position, connected to each other between the float and the wing assembly, transmitting force to one another. In particular, the first and subsequent linkages are pivotally movable relative to each other, thus enabling the creation of a toggle or folding mechanism as a holding device. For example, two linkages forming a toggle joint are arranged one behind the other in the direction of travel.

[0031] Alternatively or additionally, at least one of the two linkages is movable at least at one end relative to the float or the wing assembly. This allows a scissor mechanism for transferring the wing assembly. Alternatively or additionally, at least one of the linkages is pivotally mounted relative to the float and / or the wing assembly about a pivot axis parallel to the direction of travel. In particular, the holding device comprises at least four linkages in total, which are coupled to each other in the manner of a scissor jack (the opposing linkages are arranged in parallel). The aforementioned mechanical features of the holding device and / or the linkages allow for the provision of particularly reliable transfer mechanisms and thus water sports equipment.

[0032] Alternatively or additionally, the wing device has telescopically movable linkages mounted within or adjacent to each other, by means of which the distance of the wing device to the floating body can be varied.

[0033] In an advantageous embodiment of the invention, the water sports device has at least one depth and / or proximity sensor connected to a control unit designed to control the drive. The sensor is designed, in particular, to measure the immersion depth of the water sports device or a component thereof and / or to measure the distance of the water sports device to the (water) bottom. Alternatively or additionally, the sensor or one of the sensors is designed to measure the distance of the water sports device to an obstacle, in particular to any other water sports devices, preferably in the direction of travel. The drive is designed, in particular, such that, depending on the sensor data, especially during the movement of the water sports device, the distance of the hydrofoil assembly from the float is varied, preferably while the device is in motion, and in particular the hydrofoil assembly is at least partially moved into the operating position.The device is moved to the resting and / or starting position. This prevents damage to the watercraft from grounding, especially near the beach or shore, as well as unintended operating situations such as a float being too far from the water's surface, and assists the user in operating the watercraft. Preferably, the hydrofoil is automatically deployed after a launch near the shore or beach, provided there is sufficient water depth, and then retracted upon return.

[0034] The sensor is arranged, in particular, on the wing assembly, the mount, or the float. Preferably, the sensor includes at least one ultrasonic transducer. This allows for particularly reliable underwater measurement of distances.

[0035] Preferably, the at least one airfoil assembly has at least two wing-like wings. These extend, particularly when viewed in the direction of travel, to the left and right of a central vertical axis or a vertical median plane running in the direction of travel. In particular, the two wings are mirror images of each other with respect to the vertical plane. Particularly preferably, one or at least one of the wings, when viewed from above, is at least approximately delta-shaped. A delta-shaped configuration means a substantially triangular form, with one of the three vertices pointing in the direction of travel. The lateral flanks are particularly convex. This configuration of the airfoil assembly results in particularly low drag and enables maximum lift.

[0036] Preferably, the water sports equipment includes a fastening device, such as an eyelet, attached to the float. In particular, a sensor designed to detect tensile forces is associated with the fastening device. This allows the water sports equipment to be coupled to other watercraft and the application of force to be monitored.

[0037] In an advantageous embodiment of the invention, the water sports device has a propulsion device for its propulsion. The propulsion device is at least partially designed as part of the hydrofoil assembly or at least partially arranged between the mounting device and the hydrofoil assembly, or on parts of the mounting device intended only to remain in the water. The propulsion device's proximity to the hydrofoils results in a particularly stable position for the water sports device. In particular, the arrangement of the propulsion device prevents a loss of propulsion when the float lifts off the water's surface. The propulsion device comprises at least one propulsion element designed as an impeller or propeller, which enables high thrust with low flow resistance and low susceptibility to failure.The propulsion element is driven by a propulsion motor, which is typically an internal rotor motor with a flow channel through it. This design results in a compact propulsion system.

[0038] To control the drive and / or propulsion system, the water sports device has a control unit, which is connected in particular to the depth and / or proximity sensor. The control unit includes standard means for carrying out the control function, such as computer components, interfaces to the drive and / or propulsion system, the energy storage system, etc. In particular, communication between the individual components takes place via a bus system, which connects the motor controller of the drive and / or propulsion system, the energy storage management system, and / or a human-machine interface. The control unit, including its computer components, is located within the hull; however, its communication components are also distributed throughout the water sports device.

[0039] In particular, the impeller or propeller is arranged in a flow channel of a propulsion body. The flow channel is connected to the environment via at least two openings, preferably an inlet and an outlet. Preferably, one of the openings is formed by a laterally projecting housing wall of the propulsion body. In particular, the propulsion device is essentially elongated in the direction of travel with a substantially circular cross-section. The inlet opening is preferably arranged in an annular shape between two adjacent propulsion body sections of different diameters.

[0040] The impeller is preferably designed as a shaftless or hubless impeller. This increases the flow cross-section in the propulsion unit compared to similarly sized impellers with a shaft or hub. Furthermore, the flow within the propulsion unit is not obstructed by a shaft or hub. In combination with an inrunner motor through which the flow channel passes, a particularly compact and safe design for the water sports equipment is achieved.

[0041] Preferably, the water sports equipment, in particular the propulsion device, comprises at least one sensor, preferably a plurality of sensors from a group including gyroscopes, speed sensors, position sensors (GPS, GLONASS, BeiDou or the like), distance sensors, i.e., sensors for detecting the distance to objects or structures (in particular ultrasound, echo sounder, sonar), infrared sensors, and tilt sensors. This group of sensors also includes the aforementioned proximity and depth sensors. Equipping the water sports equipment with one or more such sensors enables the development of an "intelligent" water sports device, which makes its use not only more traceable through the storage of sensor data in a corresponding memory, but also, in particular, more comfortable, simpler, and safer.For example, a position sensor can be used to track the path, a speed sensor to adjust the stabilizing device and / or at least parts of the wing assembly, tilt sensors to balance the watercraft in an operating position, and infrared sensors to detect people in the vicinity. Depending on the sensor data, the watercraft can automatically adjust settings such as speed, height above the water surface, or the position of the stabilizing device. The control unit is designed to process the sensor signals, particularly control signals, for one or more of these processes.It is understood that the control unit for this purpose has appropriate data processing means, propulsion energy storage (in particular one or more batteries or liquid energy storage devices) and communication means including a human-machine interface.

[0042] According to an advantageous embodiment of the invention, the control unit is configured for geofencing to generate control signals based on signals from at least one sensor. Geofencing means limiting the area navigable by the watercraft based on navigation data. If the control unit detects, based on data from, for example, a position sensor, that a predefined area has been left or is about to be left, the drive power of a propulsion device can be reduced, or the wing device can be moved to a rest and / or start position.

[0043] The safety and comfort of a water sports device according to the invention are further increased if it has a propulsion energy storage device for the propulsion device and a storage sensor for monitoring the propulsion energy storage device, wherein the water sports device is designed to reduce the power or switch off the propulsion device based on the signal from the storage sensor by means of the control unit.

[0044] Preferably, the propulsion device and the control unit are designed for, in particular, automatic thrust control, and furthermore, for automatic thrust vector control. This provides the user with an additional control option, enabling, for example, particularly tight turns or even jumps. In an automated version, in conjunction with, in particular, position sensors such as gyrometers, active self-stabilization of the watercraft is provided, especially in the operating position. With active self-stabilization, the control unit thus compensates for instabilities by sending control commands to at least one actuator of the watercraft, where actuators are active control devices. These can be a motor of the propulsion device, adjustable flaps or nozzles, or adjustable fins, rudders, wings, or individual adjustable sections thereof.The control unit evaluates input variables such as data on the position of the watercraft, the power of the propulsion system, speed, acceleration, and / or user input, and generates control commands for one or more actuators. This allows beginners, in particular, to achieve a better driving experience more quickly. Specifically, the control unit is designed for active self-stabilization of the watercraft using thrust vector control during the transition to the operating position and / or when the buoyancy chamber lifts off the water's surface, as these phases are highly sensitive to the user.

[0045] Preferably, the water sports device comprises a propulsion device for its propulsion, the propulsion motor of which, arranged on the float side, is connected to a propulsion element via an angularly movable drive train. The arrangement of the propulsion motor within the float allows the wing device to be built more slender and, in particular, more streamlined.

[0046] Preferably, the propulsion device comprises a swiveling propeller, at least one swiveling guide vane and / or a plurality of nozzles that can be swivelled in different directions, so that the airfoil and / or mounting device and thus the water sports equipment can be aligned by means of the propulsion device.

[0047] Furthermore, increased comfort is achieved, especially when multiple users of the same water sports equipment are involved, if the control unit has multiple selectable driving profiles stored within it. For example, a driving profile can include a predefined maximum speed, a height above the water, or a maximum distance from a launch point or base.

[0048] Further advantages and details of the invention can be found in the following description of the figures, which are shown schematically: Fig. 1 shows an object according to the invention in a side view, Fig. 2 shows the object after Fig. 1 in a perspective view from below as well as in another operating position, Fig. 3 the object according to Fig. 1 In a rest and / or starting position, Fig. 4a shows a schematic representation of the structure of an object according to the invention in a top view, Fig. 4b shows the object according to 4a in a side view and in another position, Fig. 5 shows a schematic, partially broken structure of a drive not according to the invention.

[0049] Individual technical features of the embodiments described below can also lead to further developments according to the invention in combination with the features of the independent claim. Where appropriate, functionally equivalent parts are provided with identical reference numerals.

[0050] A water sports device 2 has a float 4 shaped like a surfboard. The water sports device can be pulled along a front fastening device 24 in the form of an eyelet. A wing device 6 is attached to the float by means of a retaining device 8. The retaining device 8 has a front link 10 and a rear link 11, by means of which the wing device 6 with its two wings 16 is attached to the float 4. The wing device can be attached by means of a Fig. 2 schematically represented drive 12 from the in the Fig. 1 The depicted operating position, in which the wing device 6 is spaced apart from the float 4, is moved into a reverse position ( Fig. 2 ) in which the wing assembly is closer to the float 4. This is an intermediate position towards the one in the Fig. 3 The depicted rest and operating position shows the wing device 6 being arranged close to the float.

[0051] The one in Fig. 2 The partially depicted drive 12 can be used according to the Fig. 4a und 4b for example, have an external shaft onto which an electric motor engages, which is arranged in a cylindrical housing 20 and on which a [missing information] is mounted in a [missing information]. Fig. 2 The float recess 22, not shown further, can be inserted (see below). Fig. 2 The recess in the float, which may also be present in other embodiments of the invention, allows the wing device with its wings 16 to pivot close to the float 4. The links 10 and 11 of the holding device are coupled to each other by a transverse linkage 24, resulting in the positive guidance shown by the circular arcs 26 describing the pivot angles.

[0052] While the front linkage 10 is constructed as a single piece, the rear linkage 11, according to the illustrated embodiment, is branched and shaped like a tuning fork, so that the front linkage 10 can pivot during the pivoting process by means of the two parallel linkage sections 28. This enables the linkage 10 to be received in the float 4.

[0053] An exemplary construction of a drive 12 not according to the invention is provided without the associated control unit with an electric motor 30 supplied with current by an energy storage device (also not shown), the motor shaft of which goes to a gearbox 32 arranged directly on the motor ( Fig. 5The motor is supplied via a supply line. The transmission 32, designed as a reduction gear, serves to transmit a correspondingly large force to a mechanical energy storage device, which has a spring 34 designed as a torsion spring. The force is transmitted via a shaft 36, on which a mounting for the torsion spring 34 is fixedly arranged. The torsion spring 34 is tensioned against a rotary housing flange 40, which is releasably held in place by a brake disc 38 of an electromagnetically actuated brake device. This rotary housing flange 40 is in turn connected to the further hollow cylindrical rotary housing 42. This housing can pivot about an axis 54. A link 10 of the holding device 8, for example, can be directly attached to the rotary housing 42.In the locked position of the holding device 8, the brake disc 38, which is fixedly attached to a brake disc mount 48, is pressed against a rotary housing flange 40 by a spring element, preferably a disc spring 46, which is supported on the magnet mount 52. This prevents the rotary housing flange 40 and the attached rotary housing 42 from pivoting about the axis 54. Actuation of the at least one electromagnet 44 by applying current generates an attractive force and causes the brake disc 38 to be drawn away from the rotary housing flange 40. This releases the rotary housing 42, and the energy stored in the mechanical energy storage device causes the rotary housing to pivot about the axis 54. By precisely adjusting the braking force, which is variable via the electromagnet 44, the speed at which the rotary housing 42 rotates or pivots can be adjusted.When the attractive force is reduced and the electromagnet 44 is switched off, the brake disc 38 with the brake disc mount 48 is pushed back towards the rotary housing flange 40 due to the existing disc spring 46, thereby braking the rotary housing and thus the rotary housing 42 until it comes to a standstill.

[0054] The internal brake disc 38 and the area of ​​the electromagnet(s) 44 with the associated magnet holder 52 are sealed from the environment by seals 50. The entire device is particularly compact due to the integration of the electric motor into the energy storage unit, which incorporates a spring element. The drive 12 is designed to be safe such that when the power is cut and the electromagnet is switched off, movement of the linkages 10 attached to the rotating housing 42 is automatically blocked and thus prevented.

Claims

1. A water sport device, in particular a foilboard, having a floating body (4), preferably in the form of a floating board, and a foil device (6), which is fastened to the floating body (4) by means of a retaining device (8), wherein the foil device (6), which is arranged on a link (10, 11) of the retaining device (8), has at least one, preferably at least two, foils (16) and can be transitioned from a resting and / or starting position into an operating position below the floating body (4) via the retaining device (8), wherein, in the operating position and during a forward movement, the floating body (4) can be transitioned into a position in which it is separated from the water surface due to uplift generated by the foil device (6), characterized in that the retaining device (8) has a drive (12), provided with an electric motor (30), via which the foil device (6) can be transitioned from a resting and / or starting position into the operating position and / or from the operating position into the resting and / or starting position, wherein the drive (12) has an energy store configured to feed the electric motor which initiates the transfer of the foil device.

2. The water sport device as claimed in any one of the preceding claims, characterized in that the water sport device, in particular the retaining device (8), has a braking device which can preferably be actuated electromagnetically or is designed electromagnetically and which releases and / or brakes the displacement of the foil device (6).

3. The water sport device as claimed in any one of the preceding claims, characterized in that the braking force is settable depending on the speed of the floating body (4).

4. The water sport device as claimed in any one of the preceding claims, characterized in that the drive (12) of the retaining device (8) is preferably arranged completely in a cutout in the floating body (4).

5. The water sport device as claimed in any one of the preceding claims, characterized in that the retaining device (8) has a further link (11) which is pivotably mounted on or in the floating body (4) at one end and pivotably arranged on the foil device (6) at the other end.

6. The water sport device as claimed in any one of the preceding claims, characterized in that one of at least three links (11) is forcibly guided and in particular articulated to one of the further links.

7. The water sport device as claimed in any one of the preceding claims, characterized in that the motor (30), gearing (32), energy store, and / or braking device are designed coaxially in particular with a pivot axis (54) of the link.

8. The water sport device as claimed in any one of the preceding claims, characterized by a propulsion device provided for the propulsion of the water sport device and preferably at least partially designed as part of the foil device and / or the retaining device.

9. The water sport device as claimed in claim 8, characterized in that the propulsion device comprises at least one propulsion element designed as an impeller or propeller.

10. The water sport device as claimed in any one of the preceding claims, characterized by at least one control unit designed to control the drive (12) and / or the propulsion device.

11. The water sport device as claimed in claim 10, characterized in that the water sport device (2) has at least one sensor, preferably a plurality of sensors, from a group comprising gyro sensors, speed sensors, position sensors, distance sensors, infrared sensors, proximity sensors, depth sensors, and inclination sensors.

12. The water sport device as claimed in claim 11, characterized in that, for the purpose of geofencing, the control unit is designed to process the signals from the sensors, in particular to form control signals, in particular wherein the control unit is designed to generate control signals for the water sport device and in particular for the propulsion device on the basis of signals from the at least one sensor.

13. The water sport device as claimed in any one of the preceding claims, including claim 8, characterized by a propulsion energy store for the propulsion device and by a storage sensor for monitoring the propulsion energy store, wherein the water sport device is designed to reduce the power or to switch off the propulsion device on the basis of the signal from the storage sensor by means of the control unit.

14. The water sport device as claimed in any one of the preceding claims, including claim 10, characterized in that the control unit is designed for communication with a control unit of a further propulsion device of the same or of a further water sport device and in particular for generating control signals for one or both propulsion devices on the basis of the position, control and / or travel signals / data transmitted by the further water sport device.

15. The water sport device as claimed in any one of the preceding claims, including claim 10, characterized in that the propulsion device and the control unit are designed for in particular automatic thrust control, further in particular for automatic thrust vector control.

16. The water sport device as claimed in any one of the preceding claims, including claim 9, characterized by a propulsion device which is provided for propelling the water sport device and whose propulsion motor, which is arranged on the floating body side, is connected in terms of drive to the propulsion element via an angularly movable propulsion train.

17. The water sport device as claimed in any one of the preceding claims, including claim 10, characterized in that the control unit is designed to self-stabilize the water sport device by means of thrust vector control during the transition into the operating position and / or in the operating position.

18. The water sport device as claimed in any one of the preceding claims, including claim 10, characterized in that the propulsion device has a pivotable propeller, at least one pivotable guide vane, and / or a plurality of nozzles pivotable in different directions.

19. The water sport device as claimed in any one of the preceding claims, including claim 10, characterized in that a plurality of selectable travel profiles are stored in the control unit.

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