Water bicycle

Abstract

The present invention relates to a water bicycle (1) comprising a floating board structure (2), a frame (3) comprising a framework joined to the floating board structure (2), which is located on the deck surface (21), and a wheel (4) connected by means of a hinged joint (9) to the frame (3) of the water bicycle (1). Like any bicycle, the water bicycle further comprises a pedalling system (5) connected to the wheel (4), said pedalling system (5) being designed to rotate the wheel (4) on the hinged joint (9) with the frame (3) when said pedalling system (5) is activated. The water bicycle (1) further comprises a steering system comprising a steering wheel means (7) and a rudder (8). The wheel (4) comprises a rotary structure joined to a plurality of blades (6), arranged in a circular array with respect to said rotary structure. The rotation of the wheel (4) with respect to the hinged joint (9) causes the blades (6) to rotate with respect to the frame (3), moving at least one section of said blades (6) below the hull surface (22).

Description

[0001] DESCRIPTION

[0002] WATER BIKE

[0003] TECHNICAL SECTOR

[0004] The present invention consists of a bicycle designed to operate on a liquid surface, such as water, allowing the rider to navigate, rather than roll, on a liquid surface when the pedaling system is activated.

[0005] The sector in which the invention is found is that of aquatic vehicles for displacement on water, manually propelled, through propellers and / or fins.

[0006] BACKGROUND OF THE INVENTION

[0007] Although the market for water bikes, that is, bicycles used to move on the surface of the water, is growing, and there is a variety of vehicles in the sector designed to move through this medium, propelled by the mechanical or manual propulsion of the user who drives it, these types of vehicles are still very scarce and not all of them are adapted to the different needs and tastes of the users.

[0008] Among the options for water bikes, one of the most common designs functions like a catamaran with two inflatable pontoons, the pedaling system and bicycle frame located between them. In this way, the vehicle resembles a catamaran, but with a bicycle frame instead of a sail.

[0009] On the other hand, there are models of water bikes that have an aluminum frame with two hydrofoils, which provide stability to the user when riding the bike, and others that work with the bicycle system installed on a paddle surf board.

[0010] However, in most of these designs, the bicycles are electrically powered due to the complexity of designing and operating a manual propulsion mechanism (i.e., powered by the user's movement on a pedal system) suitable for the conditions to which these types of vehicles are subjected. Therefore, these electric bicycles have a motor powered by batteries and may also have a pedaling system operated by the rider, which powers the batteries or the propulsion system.

[0011] On the other hand, kits are available on the market that allow you to transform a mountain or road bike for use on water. These kits include inflatable side panels that provide buoyancy and a system to transmit pedaling power to a propeller.

[0012] EXPLANATION OF THE INVENTION

[0013] The invention consists of a water bicycle, that is, for use on water or a similar fluid. Specifically, for moving across the surface of said fluid.

[0014] The water bike comprises a floating board structure, configured to float on a liquid medium, such as water. This floating board structure includes a covered surface and a hull surface, opposite the covered surface. The term "floating board structure" refers to a flat, elongated structure, similar to a surfboard, paddleboard, or windsurf board. The designation to float means that the floating board structure comprises one or more materials or compounds, as well as a shape suitable for floating on the surface of a fluid and remaining stable in a specific position and orientation—similar to a surfboard. The hull surface is the part that glides through the water, controlling the board's stability, maneuverability, and speed, while the covered surface is where the user stands for proper use of the bike.The term "floating board structure" doesn't imply that the board is made of wood, nor that it's completely rigid. In fact, there are products on the market similar to surfboards that are inflatable, not rigid, reducing the space they occupy when not in use by deflating them.

[0015] The bicycle also includes a frame comprising a structure attached to the floating board, with said frame situated on the covered surface. This frame has the same functions as a frame of a normal bicycle. That is, to provide support for all the components of the bicycle, as well as for the rider, transferring the forces generated between the means of propulsion and the rider. The aquatic bicycle comprises a wheel, connected to the frame by an articulated joint, i.e., by a pivot axle, and a pedaling system connected to the wheel. This pedaling system is configured to rotate the wheel relative to the articulated joint to the frame when the pedaling system is activated. A steering system comprising a steering wheel and a tiller is also included. Naturally, the pedaling system is also mounted on the frame, as on any normal bicycle.

[0016] When the pedals of the pedaling system are turned, the wheel also turns. The fact that the pedaling system and the wheel are connected means that they are mechanically linked, allowing the rotation of one to be transmitted to the other. Ideally, the direction of rotation of the pedaling system is the same as that of the wheel, so if the pedaling system rotates clockwise or counterclockwise, that direction of rotation is transmitted to the wheel.

[0017] As is evident, a pedaling system can comprise as many pedals and cranks as may be necessary, depending on the number of users who can ride the bicycle, but preferably, the pedaling system of the water bike is similar to that of a normal bicycle, comprising two pedals and two cranks.

[0018] Both the frame and the pedaling system must be accessible to the user, so both parts are located above the covered surface, as is the handlebar. However, the handlebars are located, either entirely or at least partially, below the helmet surface.

[0019] The wheel comprises a rotating structure attached to a plurality of fins, arranged in a circular array with respect to said rotating structure. The rotation of the wheel about the articulated joint, due to the activation of the pedaling system, causes the fins to rotate with respect to the frame, displacing at least a section of said fins below the hull surface.

[0020] In other words, with the water bike in the riding position, the rotation of the wheel relative to the frame moves the fins, or at least part of them, through the fluid supporting the board structure. This creates thrust on the fluid, propelling the bike forward. Ideally, the fins should fully enter and exit the fluid to maximize the thrust generated.

[0021] The rotating structure of the bicycle can be circular, comprising spokes that provide stability to said structure, although it is not necessary for it to be so, as long as the arrangement of the fins does have said circular distribution.

[0022] The fact that the fins have a circular matrix arrangement means that all the fins are distributed regularly, with respect to a point, in the shape of a circle, and that they are all oriented in the same direction with respect to that point, which will be the pivot point of the wheel.

[0023] In one embodiment, the articulated connection of the wheel to the frame of the water bike defines a wheel rotation axis oriented parallel to a longitudinal plane defined by the floating board structure.

[0024] In other words, the floating board structure defines a longitudinal plane, due to its board-like shape, such that, in its operating position, the bicycle can move in any direction along that plane. Preferably, the wheel's axis of rotation, parallel to the longitudinal plane, is parallel to the ground on which it rests, just like the axis of rotation of the wheels of a standard bicycle designed for solid terrain.

[0025] This longitudinal plane is defined by two directions. A longitudinal direction, which is the direction of movement—forward or backward—of the water bike, and a transverse direction, perpendicular to the longitudinal one, which is the direction of the wheel's axis of rotation. To these two directions, we must add a direction perpendicular to the longitudinal plane, which defines the orientation and arrangement of the water bike's components.

[0026] In one embodiment, the floating board structure comprises two floating elements, joined via the frame, arranged symmetrically with respect to said frame. In this embodiment, the wheel is located between the two floating elements (with respect to a transverse plane defined by the bicycle frame, perpendicular to the longitudinal plane defined by the floating board structure), passing at least partially through the floating board structure as previously described. Preferably, the two floating elements are symmetrically identical or substantially similar and are arranged symmetrically opposite each other with respect to the frame, in order to obtain a regular, balanced structure for the user of the water bike. The fact that the floating board structure comprises two floating elements, one on each side of the frame, can provide greater stability by providing more than one contact surface with the water.

[0027] Preferably, the floating board structure of the above embodiment comprises at least one adjustable joining system between the two floating elements, comprising: at least one cross support, fixed to the frame of the water bike; and two or more detachable rigid joints between each end of the cross support and one of the floating elements.

[0028] In this way, by having more than one rigid, detachable joint at each end of the cross support, it is possible to attach the two floating elements at more than one point on said cross support. This allows the two floating elements to be positioned at different distances from the bicycle frame, within two extremes. One extreme, further away, where the two floating elements are as far apart as possible, and the other extreme where the two floating elements are as close together as possible. Obviously, it is advisable to always position the floating elements at the same distance from the frame so that the user can maintain the balance of the water bike.

[0029] In this same embodiment, it is possible to position each of the floating elements in an infinite number of positions limited by two ends. For example, it is possible to have a sliding connection between each floating element and each transverse support, and a clamping system that creates a rigid connection between them.

[0030] Even more preferably, the adjustable joining system between the two floating elements comprises: at least two transverse supports, each fixed to a different end part of the water bike frame; said two transverse supports being arranged parallel to each other; and two or more detachable rigid joints between each end of each transverse support and one of the floating elements; wherein the wheel is located between the two transverse supports, with respect to the longitudinal plane defined by the floating board structure.

[0031] This design doubles the number of fixings and improves the stability of the water bike by allowing the wheel to be placed between the two floating elements and between the two transverse supports.

[0032] Within these realizations, where the floating table structure comprises two floating elements, joined through the box, there are two different configurations when these two floating elements are at the second end, that is, when the two floating elements are as close together as possible.

[0033] One initial configuration involves the two floating elements being positioned in lateral contact, as if they formed a single body or a single floating element. The effect would be the same as having a single floating element beneath the bicycle frame. In this embodiment, the two floating elements would need a lateral through-opening on an inner side, which, upon contact, would form a through-cavity in the center, into which the wheel could be positioned. In this way, the wheel's fins could move beneath the hull surface as they pass through the through-cavity.

[0034] The second configuration would be one in which, with the two floating elements at the second end, being as close as possible, they do not touch, leaving enough space between them for the wheel fins to pass under the hull surface.

[0035] In a different embodiment from the previous ones, the floating table structure comprises a single fixed floating structure, instead of two, located under the frame.

[0036] Whether the floating board structure comprises two floating elements or a single floating element, it may include a cavity in its upper surface to allow the pedals to rotate without colliding with the structure. For example, it may include a curved recess precisely where the pedals travel.

[0037] In one embodiment, the pivot axis of the articulated wheel-to-frame joint is located on the covered surface. In this embodiment, when the floating board structure comprises a single floating element, or when it comprises two floating elements meeting at the second end, the floating board structure includes a through-cavity. In this way, the wheel is at least partially inserted into this through-cavity, passing through the floating board structure.

[0038] When it is stated that the pivot axis of the articulated joint, from the wheel to the frame, is located on the covered surface, it means that it is at a height above said surface, with the water bike in a position of use, not necessarily having to be attached to said surface, and is therefore accessible to the user riding the bike.

[0039] The fact that the wheel is at least partially inserted into the through-cavity implies that, during its rotational movement, part of the rotating structure or some part of the fins pass through the through-cavity of the floating board structure, reaching the fluid on which the hull surface of the floating board structure rests, in order to generate propulsion. Thus, part of the wheel is above the covered surface, another part is within the through-cavity, and another part is below the hull surface.

[0040] Preferably, during the use of the bicycle and, therefore, during the rotation of the wheel with respect to the articulated joint, the entire surface of each fin passes through the entire through cavity for each turn.

[0041] In one embodiment, the pedaling system is rigidly connected to the wheel, with the pedaling system comprising a pivot axis that coincides with the wheel's pivot axis. That is, the pedaling system comprises two pedals and two corresponding cranks to which the pedals are attached, as in traditional unicycles. These cranks are connected by the pivot axis of the pedaling system, which, in this embodiment, coincides with the wheel's pivot axis. Therefore, chains or belts are not required between the pedaling system and the wheel, as is the case in traditional bicycles. The rigid connection means that each rotation of the pedaling system produces a rotation of the wheel, regardless of the direction of pedaling. In other words, if the pedaling system rotates counterclockwise, the wheel also rotates counterclockwise, propelling the water bike forward.When the bicycle is moving forward, turning the pedals clockwise will produce a braking effect. If the bicycle is stationary and turning the pedals clockwise causes the wheel to rotate clockwise, moving the bicycle backward.

[0042] This design avoids intermediate elements that are susceptible to deterioration with use, such as the chain, especially if it is in a humid and saline environment.

[0043] In one embodiment, the frame comprises a plurality of bars rigidly joined together, where each bar is primarily subjected to axial stresses, thus comprising a simple structure for the stresses to be supported.

[0044] In one embodiment, the plurality of frame bars comprises a curved bar, with a semicircular shape, comprising ends connected to two different parts of the floating board structure.

[0045] In one embodiment, the water bike comprises a saddle attached to the frame. The user can lean on the saddle to activate the pedaling system with their feet, like a traditional bicycle. Preferably, the connection between the frame and the saddle is rigid and detachable, allowing it to be adjusted to the user's needs. Preferably, the saddle is attached to the curved bar of the frame.

[0046] In one embodiment, the steering system's steering element comprises a handlebar, located on the covered surface, articulated to the frame (i.e., with respect to an axis), and rigidly attached to the rudder, which is located below the hull surface. In this way, both the steering element and the rudder can pivot with respect to the frame of the water bike.

[0047] In one embodiment, the rudder is located on a portion of the bow of the floating structure, facilitating a simple connection between the handlebars and the rudder using only a straight bar. In another embodiment, the water bike includes a fin fixed to the floating structure, located below the hull surface, preferably below the stern. This fin provides stability to the craft, preventing it from easily capsizing.

[0048] In one embodiment, all the fins of the fin plurality are identical and comprise an open, curved shape, preferably a cylindrical cross-section. That is, they comprise a longitudinally straight profile, but with an open cross-section curved about an axis of curvature, as part of a cylinder, and may have a semi-cylindrical shape. This simplifies their manufacture and assembly, and the thrust generated by the fins on the water is the same.

[0049] In one embodiment, the open, curved, cylindrical cross-section of each fin defines a curvature axis oriented radially to the wheel to which the fin is attached. That is, in this embodiment, the fins are not straight but curved (like half or less of a cylinder), taking advantage of this shape so that the concave surface impacts the water, allowing for greater thrust than if the fins were straight, by displacing a greater volume of liquid with each movement of each fin.

[0050] In a different embodiment, each fin defines an axis of curvature inclined at an angle with respect to a radial direction of the wheel to which the fin is attached. That is to say, it is a similar embodiment to the previous one in terms of the shape of the fins, but their orientation is no longer radial; instead, it is inclined at an angle that allows the insertion of the fins into the water to be more gradual than with radially oriented fins.

[0051] In a different embodiment, the cylindrical axis of each fin is oriented in a direction other than radial. That is, each curved fin is inclined with respect to the radial direction, so that when the fin enters the water due to the rotation of the wheel in the forward direction, the fin is inserted gradually rather than the entire curved surface being thrust in at once. This ensures that with each stroke of the pedals, the bow of the boat tends to rise instead of the stern, thus achieving better navigation.

[0052] In another different embodiment, all the fins of the plurality of fins are equal and each comprises a straight profile comprising a V-shaped section. Similarly to curved fins, V-shaped fins can be oriented in a radial direction, or in a direction other than radial, suitable for making their insertion into the water more gradual.

[0053] The V-shape of the fins makes them more aerodynamic, allowing them to generate propulsion in the same way as other curved fins, but enabling greater speed due to their reduced surface area and reduced drag in the water. Furthermore, their flat shape allows the fin to act as a keel, providing greater stability to the system.

[0054] The wheel may comprise an indeterminate number of fins for its proper functioning. In fact, if it comprised only one fin, the bicycle could function (with low performance), but preferably it comprises between 5 and 30 fins, and more preferably 9 or 10 fins.

[0055] In one embodiment, the water bike comprises at least one stabilizing element comprising at least one arm having a first end attached to the floating board structure and a second end attached to a floating secondary structure. The floating secondary structure, which is configured to float on a liquid medium, may comprise a deck and a flotation hull.

[0056] Preferably, the floating secondary structure comprises a shape, orientation, and position similar to the floating board structure, comprising a structure that provides stability similar to the pontoon on a catamaran.

[0057] This stabilizing element allows the user to get on and off the bicycle more easily than if they did not understand it, especially considering that the bicycle is used on water, which is an unstable medium.

[0058] Furthermore, this embodiment is compatible whether the floating table structure comprises one or two floating elements, and in the embodiment comprising two floating elements that can be positioned at different transverse separations. In one embodiment, the first end of the arm is articulated to the floating table structure, i.e., about an axis. Thus, the secondary floating structure is configured to pivot about the floating table structure between:

[0059] - a first extreme, stabilizing position, with the floating hull of said secondary floating structure located at the same height as the hull surface of the floating plank structure, with respect to the frame; and

[0060] - a second extreme position, retracted, with the floating hull located at a higher height than the covered surface of the floating board structure.

[0061] That is, the stabilizing element can be articulated to favor the stability of the vessel, by placing the floating secondary structure supported on the fluid on which the hull surface rests, thereby obtaining a larger support surface, and to increase the speed of displacement, by reducing the contact between the bicycle and the fluid, by raising the floating secondary structure to a higher height, to avoid it coming into continuous contact with the fluid on which the hull surface of the floating board structure rests.

[0062] In one embodiment, the second end of the arm is articulated to the floating secondary structure, allowing the floating secondary structure to be collected when it is not in the first extreme position, resting on the water.

[0063] In one embodiment, the arm comprises an extendable structure. For example, the arm may comprise two or more bars joined by a telescopic connection. This allows the distance between the floating secondary structure and the floating board structure to be increased and decreased, thereby increasing stability when the floating secondary structure is in its first extreme, stabilizing position, and retracting, occupying less space, when it is in its second extreme position.

[0064] Preferably, the bicycle comprises two stabilizing elements, where a first stabilizing element is located to port and a second stabilizing element is located to starboard of the floating board structure. This configuration provides stability on both sides of the floating board structure. Preferably, the two stabilizing elements are positioned symmetrically with respect to the floating board structure. In one embodiment, the stabilizing element comprises two arms connected at one end to the floating board structure and at the other end to the secondary floating structure. This provides a stronger connection between the floating board structure and the second stabilizing element than with only one arm.

[0065] BRIEF DESCRIPTION OF THE DRAWINGS

[0066] To complete the description and to aid in a better understanding of the characteristics of the invention, this descriptive document is accompanied, as an integral part thereof, by figures which, for illustrative and non-limiting purposes, depict the following:

[0067] Figure 1: Shows a schematic elevation view of the water bike, where you can see the partially sectioned floating board structure, the bike frame, and the components connected to these elements, such as the saddle, the steering system, or the pedaling system.

[0068] Figure 2: Shows a schematic plan view of the water bike, where the floating board structure connected to two stabilizing elements can be seen.

[0069] Figure 3: shows a schematic profile view, sectioned in half, of the water bike, as shown in Figure 2, where the floating board structure connected to two stabilizing elements can be seen.

[0070] Figure 4: detailed view of three wheel fins, where their semi-cylindrical shape can be seen.

[0071] Figure 5A shows a wheel with a plurality of fins, these fins being inclined with respect to the radial direction, indicated by the dashed line, so that their insertion into the water or fluid on which the water bike rests is more gradual than if they were in a radial direction.

[0072] Figure 5B shows a wheel with a plurality of fins, these fins being oriented in a radial direction of said wheel.

[0073] Figure 6A shows an elevation and a plan view of an open curved fin with a cylindrical section.

[0074] Figure 6B shows an elevation and a plan view of an open fin, with a “V” shaped section.

[0075] Figure 7A shows a schematic elevation view of the water bike, illustrating the arrangement of some of its components, and especially the curved recess that allows the pedaling system to rotate. Figures 7B-7D show schematic top views of the water bike, which comprises two floating elements joined by two transverse supports. The two floating elements are positioned at varying distances, from in contact in Figure 7B to as far apart as possible at one end in Figure 7D. These floating elements each have a through-hole lateral opening, which in Figure 7B forms the through-hole cavity. Figure 8A shows a schematic rear elevation view of the water bike, illustrating the arrangement of some of its components, and especially the curved recess that allows the pedaling system to rotate.

[0076] Figures 8B and 8D show two schematic views of the upper floors of the water bike, in which the two floating elements that make up the floating board structure cannot come together, with the closest point being the one shown in Figure 8B and the furthest being the one shown in Figure 8D, without requiring the through-lateral openings that form the through-cavity.

[0077] Figures 8C and 8E show two schematic views of the floating board structures, along with the pedaling system, from Figures 8B and 8D, where the separation between the floating elements can be seen.

[0078] List of elements shown in the figures:

[0079] 1. - Water bike

[0080] 2. Floating table structure

[0081] 21. Covered area

[0082] 22.- Hull surface

[0083] 23. Floating elements

[0084] 24.- Cross support

[0085] 25.- Side through opening

[0086] 26.- Curved casting

[0087] 3.- Table

[0088] 4.- Wheel

[0089] 5.- Pedaling system

[0090] 6.- Fins

[0091] 7. Steering wheel 8. Steering wheel

[0092] 9. Articulated joint

[0093] 10.- Through cavity

[0094] 11.- Saddle

[0095] 12.- Spoiler

[0096] 13. Floating secondary structure

[0097] 14.- Arm

[0098] PREFERRED EMBODIMENT OF THE INVENTION

[0099] As can be seen in the attached drawings, the invention consists of a bicycle for moving on the surface of a liquid, hence its name as "Water Bicycle".

[0100] In its simplest embodiment, said water bike (1) is composed, practically, of a floating board structure (2), comprising a floating element, similar to surfboards or windsurf boards, a frame (3) attached to said floating board structure (2), a wheel (4), to generate the propulsion of the water bike (1) on the liquid, articulated to the frame (3), and a pedaling system (5), connected to both the frame (3) and the wheel (4).

[0101] The floating board structure (2) comprises two clearly differentiated surfaces. A covered surface (21), on which the user driving the water bike (1) is located, and therefore the frame (3) and the pedaling system (5), and a hull surface (22), opposite the covered surface (21), which will rest on the surface of the liquid, through which the water bike (1) moves.

[0102] To enable the user to operate the water bike (1), the frame (3) is rigidly attached to the floating board structure (2) and is also connected to a saddle (11) so the user can lean on it while pedaling, like a traditional bicycle. In addition to the saddle (11), the water bike (1) also includes a steering system comprising a steering half (7), accessible to the user as it is located on the covered surface (21) and articulated to the frame (3). This steering half (7), shaped like a handlebar, is connected to a rudder (8), which is located under the hull surface (22), as shown in Figure 1. The operation of the water bike (1) is very simple.The rider can lean back on the saddle (11), holding the handlebars (7) with their hands, while using their legs to activate the pedaling system (5) by placing their feet on the pedals—essentially the same as a traditional bicycle. The difference lies in the vehicle's propulsion system and its position on the riding surface.

[0103] The pedaling system (5) is rigidly attached to the wheel (4), mounted on the frame (3) at the articulated joint (9) connecting the wheel (4) to the frame (3). Therefore, when the pedaling system (5) is activated—that is, when the pedals are turned at the articulated joint (9)—the wheel (4) rotates the same number of degrees and in the same direction as the pedals. In other words, there is primarily no energy transfer between the two parts, and all the movement the user makes on the pedaling system (5) is transferred to the wheel (4).

[0104] For the displacement of the water bike (1) to occur, the wheel (4) comprises a rotating structure attached to a plurality of fins (6), said fins (6) arranged in a circular array form with respect to said rotating structure.

[0105] One preferred embodiment, shown in Figures 1 and 3, comprises a single, board-shaped floating element with a through-cavity (10) through which part of the wheel (4) passes. The hinged joint (9) between the wheel (4) and the frame (3) is positioned on the deck (21), while part of the wheel (4) protrudes through the hull surface (22). As the wheel (4) rotates, the fins (6) move (rotating about the hinged joint (9)) through the through-cavity (10) and under the hull surface (22). Thus, when the water bike (1) is in its operating position on a liquid surface, it is propelled by the force exerted by the fins (6) on the liquid.If the user turns the pedaling system (5) in one direction, the water bike (1) will move in that direction, along a longitudinal plane defined by the floating board structure (2). This direction can be selected by turning the steering wheel (7) (and the rudder). If the user turns the pedaling system (5) in the opposite direction, the movement along the same longitudinal plane will also occur, but in the opposite direction. The number of fins (6) is crucial in determining the effort required by the user and the speed achievable by the water bike (1), depending on their size and the rotating structure of the wheel (4). Preferably, the wheel (4) comprises between five and thirty fins (6), but even more preferably, the wheel (4) comprises ten fins (6).

[0106] Figure 4 shows that all the fins (6) of the plurality of fins (6) are identical and, in one embodiment, comprise a curved, preferably semicylindrical, shape. This shape facilitates the propulsion of the water bike (1) through the liquid in a specific direction, but hinders it if the water bike (1) is to be moved in the opposite direction. This is because the curved shape can displace a greater volume of liquid when the fin impacts the water, as it comprises a concave curved surface, than a flat surface.

[0107] The orientation of these curved cylindrical surfaces is very important to obtain the maximum possible propulsion for the defined water bike (1). Therefore, preferably the curved semicylindrical shape of each fin (6) defines an axis oriented in a radial direction of the wheel (4) to which the fin (6) is attached, as shown in Figure 5B.

[0108] In other embodiments, the axis of the semi-cylindrical curved shape of each fin (6) comprises a direction other than radial, as shown in figure 5A, seeking to make the insertion into the water more gradual in the forward direction.

[0109] In another different embodiment, the fins (6), instead of being curved, are flat, and even more preferably comprise a “V” shaped section.

[0110] As can be seen in Figure 1, the water bike (1) frame (4) comprises a structure consisting of a plurality of bars rigidly connected to each other. One of these bars is a curved bar, semicircular in shape, with ends connected to two different parts of the floating board structure (2). This is because the propulsion system of the water bike (1) differs from traditional ones, comprising a single wheel located under the saddle (11), and therefore this curved bar is well suited to the structural requirements of the water bike (1). To improve the stability of the water bike (1), the floating board structure (2) is attached, under the hull surface (22), to a fin (12), which is common on watercraft such as surfboards.

[0111] In addition to the fin (12), the water bike (1) preferably also comprises two stabilizing elements, one located on each side of the floating board structure (2). In nautical terms, this would be one to port and one to starboard of the floating board structure (2). Each of these stabilizing elements comprises two arms (14), each comprising a first end attached to the floating board structure (2) and a second end attached to a secondary floating structure (13); as well as the secondary floating structure (13), configured to float on a liquid medium.

[0112] These stabilizing elements are shown in figures 2 and 3, and as can be seen, they provide stability to the vessel, generating support surfaces for the water bike on the liquid, beyond that provided by the floating board structure (2).

[0113] These support surfaces make it easier for the user to get on and off the water bike (1), preventing it from easily rocking when the floating board structure (2) rests on a liquid. However, they can hinder movement when the user is pedaling, due to the larger surface area of ​​friction. Therefore, each arm (14) is articulated to the floating board structure (2).Thus, the secondary floating structure (13) is configured to pivot, with respect to the floating board structure (2), between a first extreme position, of stabilization, with the floating hull of said secondary floating structure (13) located at the same height as the hull surface (22) of the floating board structure (2), with respect to the frame (4), which allows increasing the stability of the vessel, and a second extreme position, retracted, with the floating hull located at a higher height than the covered surface (21) of the floating board structure (2), which allows reducing the contact between the vessel and the liquid on which it rests.

[0114] To increase the capacity of these stabilizing elements, each arm (14) is extendable by means of a telescopic connection, that is, it comprises two or more bars assembled one inside the other, which can be deployed axially. In this way, the length of the arms (14) can be increased to provide greater stability in the first extreme, stabilizing position, and can be reduced so that these stabilizing elements do not interfere with the user in the second extreme, retracted position.

[0115] A preferred embodiment, alternative to that shown in Figures 1, 2, and 3, is one in which the floating board structure (2) comprises two floating elements (23) joined via the frame (3), instead of a single floating element, with the remaining elements of the water bike (1) being identical, or virtually identical. This is because the two floating elements (23) of the floating board structure (2) are rigidly attached to the frame (3) as if it were a single element. Therefore, the frame (3), the wheel (4), the pedaling system (5), and the remaining elements are as described for this embodiment. The different configurations of this embodiment are shown in Figures 7B-7D and 8B-8E.

[0116] As can be seen, these two floating elements (23) are symmetrically identical and arranged symmetrically with respect to the frame (3), or more precisely, with respect to a plane normal to the longitudinal plane defined by the floating board structure (2). They could obviously not be, but this arrangement is necessary for the water bike (1) to be as stable as possible. The wheel (4) is located between the two floating elements (23), passing at least partially through the floating board structure (2).

[0117] Given this configuration, with two floating elements (23), the floating table structure (2) can include an adjustable joining system between the two floating elements (23), allowing them to be separated or positioned at different distances, depending on the user's balance requirements. That is, they can be positioned between a first, distant end, as shown in Figures 7D and 8D, and a second, closer end, as shown in Figure 8B, such that they can come into contact, if required, as shown in Figure 7B.

[0118] These figures also show that the adjustable connection system comprises two transverse supports (24), fixed to the frame (3) of the water bike (1); and two or more detachable rigid connections between each end of the transverse supports (24) and each of the floating elements (23). Each of the transverse supports (24) is attached to a different end portion of the frame (3) of the water bike (1), with the two transverse supports (24) arranged parallel to each other.

[0119] The configuration of the adjustable joining system between the two floating elements (23) is such that it allows them to be placed at any distance between two ends, which provides infinite separation positions between floating elements (23).

[0120] Within this realization there are two different configurations, shown in figures 7 and 8.

[0121] A first configuration would be that shown in Figures 7A-7D, where the two floating elements (23) can be placed in lateral contact, as shown in Figure 7B, as if they were forming a single body or a single floating element. The effect would be the same as having a single board under the bicycle frame. In this embodiment, it would be necessary for these two boards to have a lateral through-opening (25) on an inner side, which, when in contact, would form a through-cavity (10) located in a central part, in which the wheel (3) could be positioned. In this way, the fins (6) of the wheel (3) could move under the hull surface (22).

[0122] The second configuration would be one in which, with the two floating elements (23) at the second end, being as close as possible, as shown in figure 8B, they do not come into contact, leaving a space between them sufficient for the wheel (3) and for the fins (6) to pass under the hull surface (22).

[0123] In all the described embodiments, the floating board structure (2) may include a curved recess (26) in the covered surface, which can be seen in Figures 7A and 8A. This curved recess (26) allows the pedaling system (5) to avoid colliding with the floating elements (23) when rotating, providing an ergonomic position for the user of the water bike (1).

[0124] Regarding the floating board structure (2), it is not limited to a single body or a series of rigid bodies, such as floating elements (23), for movement, like traditional surfboards. Surfboards, as well as boards for other water sports, are now known to be flexible and inflatable, meaning they can be filled with air, forming a rigid body when inflated, but flexible when deflated. This allows for easier storage by reducing the space they occupy when not in use.

Claims

CLAIMS 1. A water bicycle (1) characterized in that it comprises: a floating board structure (2), configured to float on a liquid medium, wherein said floating board structure (2) comprises a covered surface (21) and a hull surface (22), opposite the covered surface (21); a frame (3), comprising a frame attached to the floating board structure (2), wherein said frame (3) is situated on the covered surface (21); a wheel (4) connected by means of an articulated joint (9) to the frame (3) of the water bicycle (1); a pedaling system (5) connected to the wheel (4), said pedaling system (5) being configured to rotate the wheel (4), about the articulated joint (9) with the frame (3), when said pedaling system (5) is activated; a steering system comprising a steering wheel half (7) and a tiller (8);where the wheel (4) comprises a rotating structure attached to a plurality of fins (6), arranged in a circular array with respect to said rotating structure; where the rotation of the wheel (4) with respect to the articulated joint (9), due to the activation of the pedaling system, rotates the fins (6) with respect to the frame (3), displacing at least one section of said fins (6) below the hull surface (22).; 2. Water bike (1), according to claim 1, wherein the articulated joint (9) of the wheel (4) to the frame (3) of the water bike (1) defines a wheel (4) pivot axis oriented parallel to a longitudinal plane defined by the floating board structure (2).

3. Water bicycle (1), according to claim 2, wherein the floating board structure (2) comprises two floating elements (23), joined through the frame (3), arranged symmetrically with respect to the frame (3); and wherein the wheel (4) is located between the two floating elements (23), passing, at least partially, through the floating board structure (2).

4. Water bike (1), according to the preceding claim, wherein the floating board structure (2) comprises at least one adjustable joining system between the two floating elements (23), comprising: a transverse support (24), fixed to the frame (3) of the water bike (1); and two or more detachable rigid joints between each end of the support transverse (24) with one of the floating elements (23).

5. Water bike (1), according to the preceding claim, the adjustable joining system between the two floating elements (23) comprises: at least two transverse supports (24), each fixed to a different end part of the frame (3) of the water bike (1); said two transverse supports (24) being arranged parallel to each other; and two or more detachable rigid joints between each end of each transverse support (24) with one of the floating elements (23); wherein the wheel (4) is located between the two transverse supports (24), with respect to the longitudinal plane defined by the floating board structure (2).

6. Water bicycle (1), according to any of the preceding claims, wherein the pivot axis of the articulated joint (9) of the wheel (4) to the frame (3) is located on the covered surface (21); wherein the floating board structure (2) comprises a through cavity (10); and wherein the wheel (4) is, at least partially, inserted into the through cavity (10) passing through the floating board structure (2).

7. Water bicycle (1), according to any of the preceding claims, wherein the pedaling system (5) is connected to the wheel (4) in a fixed manner, the pedaling system (5) comprising a pivot axis coinciding with the pivot axis of the wheel (4).

8. Water bicycle (1), according to any of the preceding claims, wherein the frame (4) comprises a plurality of bars rigidly joined together.

9. Water bicycle (1), according to the previous claim, wherein the plurality of bars of the frame (4) comprises a curved bar, with a semi-circle shape, comprising ends connected to two different parts of the floating board structure (2).

10. Water bicycle (1), according to any of the preceding claims, comprising a saddle (11) attached to the frame (4).

11. Water bicycle (1), according to any of the preceding claims, wherein the steering half (7) of the steering system comprises a handlebar, located on the covered surface (21), articulated to the frame (4), and attached to the rudder (8), in a fixed manner, which is located under the hull surface (22).

12. Water bicycle (1), according to any of the preceding claims, wherein the rudder (8) is located in a part of the bow of the floating board structure (2).

13. Water bicycle (1), according to any of the preceding claims, comprising a wing (12) fixed to the floating board structure (2), located under the hull surface (22).

14. Water bicycle (1), according to any of the preceding claims, wherein all the fins (6) of the plurality of fins (6) are equal and comprise an open curved shape and, preferably, a curved shape of cylindrical section.

15. Water bicycle (1), according to the previous claim, wherein the open curved shape, of cylindrical section, of each fin (6) defines an axis of curvature oriented in a radial direction of the wheel (4) to which the fin (6) is attached.

16. Water bicycle (1), according to claim 14, wherein the open curved shape, of cylindrical section, of each fin (6) defines an axis of curvature inclined at an angle with respect to a radial direction of the wheel (4) to which the fin (6) is attached.

17. Water bicycle (1), according to any of the preceding claims 1 to 13, wherein all the fins (6) of the plurality of fins (6) are equal and each of them comprises a straight profile comprising a “V” shaped section.

18. Water bicycle (1), according to any of the preceding claims, comprising at least one stabilizing element comprising: - at least one arm (14) comprising a first end attached to the floating board structure (2) and a second end attached to a secondary floating structure (13); and - the floating secondary structure (13) configured to float on a liquid medium.

19. Water bicycle (1), according to the preceding claim, wherein the first end of the arm (14) is articulated to the floating board structure (2), wherein the secondary floating structure (13) is configured to pivot with respect to the structure floating table (2) between: - a first extreme, stabilizing position, with the floating hull of said secondary floating structure (13) situated at the same height as the hull surface (22) of the floating plank structure (2), with respect to the frame (4); and - a second extreme position, retracted, with the floating hull located at a higher height than the covered surface (21) of the floating board structure (2).

20. Water bicycle (1), according to claim 16 or 17, wherein the second end of the arm (14) is attached to the floating secondary structure (13) in an articulated manner.

21. Water bicycle (1), according to any of claims 16 to 18, wherein the arm (14) comprises an extendable structure.

22. Water bicycle (1), according to any of claims 16 to 19, comprising two stabilizing elements, wherein a first stabilizing element is located to port and a second stabilizing element is located to starboard of the floating board structure (2).

23. Water bicycle (1), according to any of claims 16 to 20, wherein the stabilizing element comprises two arms (14) joined at a first end to the floating board structure (2) and at the second end to the floating secondary structure

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