Windsurfing board

Abstract

A windsurfing board formed by a base that slides over the water and having a folding joint, with a mast, a sail and a boom with two lateral branches, some facing compartments with cover for concealed wheels, and another compartment with a watertight cover for documentation. The base has a rudder and/or lower wing with a moveable part activated by turning grips located on the boom. There are also some rollers for the two cables holding the harness of the windsurfer and some floats. On the lower edge of the sail is attached an addition whose lower edge is fixed to a support that turns with the foot of the mast. The mast has some limiting stops in its downward movement and is formed in three removable parts. The sail has some cross-pieces for stretching its free edge.

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention refers to an improved windsurfing board, having improved handling and carrying as compared to present boards.

[0003] 2. The Prior Art

[0004] Currently existing windsurfing boards formed by a base with a mast, a sail and the rigging, offer a number of problems that make transport, storage and handling difficult.

[0005] First, due to their length, it is difficult to transport and/or store them in a conventional dwelling, nor do they fit into elevators, which means that the boards must be taken by the stairs in various trips (base, sail and mast).

[0006] Also, during transport, the base is usually carried by a single person under the arm, in a vertical position, offering a surface exposed to the wind which pushes it and makes transport difficult.

[0007] Once in the water, raising the sail is very difficult, particularly for beginners, due mainly to the ball joint between the mast and the base. These difficulties are accentuated in case of a fall, because the sail usually remains half submerged, holding water. In addition, the boom becomes hooked onto the prow or stern of the base, requiring the person to swim to unhook it.

[0008] Another additional inconvenience of present boards during navigation is that there is no directional control (the rudder is fixed), and it can be difficult to hold a specific course. Also, the joint between the base and the sail makes it complicated to maintain one's balance during movements to change direction.

[0009] Another additional inconvenience of this type of boards is that the harness from which the windsurfer hangs to rest his arms is of a specific length and has a single anchoring point to the boom, so that it can only be used under limited wind conditions and positions of the base and sail.

SUMMARY OF THE INVENTION

[0010] The board of the invention, because of its constitution and use,, allows for windsurfing under optimum conditions, especially in the case of beginners, and also facilitates its transport and/or storage.

[0011] According to the invention, the windsurfing board is formed by a base that slides over the water and a mast attached to the base. A sail is mounted on the mast, which is controlled by a boom with two lateral branches.

[0012] The base can be folded by a transverse joint, ideally formed by hinges that are hidden in the fold, ensuring this unfolded position by means of claw type or similar closures. The folded position of the base is also ensured by means of a wire that extends to the folded ends and is fixed and unmoveable in the lower part of the stem, ideally having an end bolt to hold a hook placed in the stern.

[0013] There are two facing seatings in the stem of the base for two swinging wheels that are fixed in two half covers hinged from the seatings, and which are held in the outside position by bolts on the other two half covers of each seating, with these half covers closed during navigation and covering the seatings.

[0014] The base has ideally at least one rear rudder with a moveable portion to facilitate maintenance of the trajectory of the board during navigation. This moveable portion is moved by an upper rocker arm activated by a control buckle formed by cables and a transmission that allows it to turn independently of the sail with respect to the base. The control buckle has a turning handle on each lateral branch of the boom, for turning the rudder. The upper rocker arm of the moveable part of the rudder has a compartment opened in the base, in which the cables of the control buckle are rolled to absorb stretches of the cables caused by the movements of the mast. From the inside of the compartment, access is gained to another compartment with a watertight cover to hold documents, distress rockets, etc.

[0015] The mast is joined to the base by a sliding mast foot, which operates by means of slides along guides. The guides ideally have a trapezoidal section based in the base, which can be accessed through the folding join of the same. The slide of the mast foot is blockable by a bolt inserted in holes made in the surface of the base. In this way, the mast can be fixed in a more or less forward position to better use the wind during sailing.

[0016] The foot of the mast has a double joint consisting of two perpendicular axes around which the foot of the mast turns. There are stops that limit of the scope of these movements and stop the mast from touching the surface of the board when it is laid over laterally and/or sideways. The stops also limit the swinging movement when the mast is almost vertical (ideally at a maximum of 15° forward) which aids in avoiding falls of the windsurfer when slowing down or when turning into wind. Also, these stops avoid the mast pressing the hands or feet of the windsurfer on the base board and also impede the submerging of the sail when there is a fall, with greater ease of later raising. All the stops have elastomer portions that absorb contacts between the materials and prolong their useful life.

[0017] The foot of the mast has a bolt with an outer groove for receiving the base of the sail, which is set in its position by a blocker that is inserted into the groove in the bolt. In the front part of each of the lateral branches of the boom are mounted the turning handles of the rudder control buckle, while in the rear part are mounted two floats that help to stop the sail submerging after a fall. In the intermediate area of each lateral arm of the boom is set a roller for a cable that is fixed to the harness of the windsurfer, with each roller having a recovery spring, ideally a flex and a block that can be freed using a slide. Each roller has two cylindrical casings superimposed, with the outer one turning. The interior casing has a longitudinal straight groove and the exterior has a peripheral helicoidal groove. Both grooves are superimposed and the harness cable runs through them so that by turning the outer casing, the outlet position of the cable varies longitudinally, which serves to balance and extend to both arms equally the holding of the boom at all times during sailing.

[0018] Inside the foot of the mast is a transmission that forms part of the rudder control buckle, and allows turning independently of the mast with respect to the base board, which could not be done if there was a continuity in the cables of the control buckle at that point. This transmission is formed by two concentric bushings that turn independently of each other, and which slide together and concentrically vertically along the bolt in the foot of the mast. The movement of the bushings is caused by a forked piece that is attached to an axis in an external rocker where the ends of the cables of the rudder control buckle are attached, coming from the turning grips of the boom, while the other busing moves another fork attached to an axis that moves another external rocker to which are attached the ends of the cables from the control buckle of the rudder that moves the upper rocker of the turnable part of the latter. Thus, the movements of the turning grips of the boom are transmitted by the cables and by the transmission to the rudder, allowing independent turn of the sail in relation to the base.

[0019] The lower edge of the sail is very high with respect to the base due to the height of the mast foot. Therefore, a sail supplement is placed on that edge is placed and fixed. The sail supplement is held in the lower part to a turning support that forms part of the mast foot itself. In this way, turbulences are avoided in the lower part of the sail that cause wind to pass through this area.

[0020] The mast has a raising halyard that is extended to pass under the base and attach to an anchoring point located in the upper part of the stem of the base, immobilizing the lowered sail against its stops, which facilitates towing and handling the board in the water when not sailing.

[0021] During sailing, this halyard is held in a buckle formed between its holding point to the boom, a lug placed in the base of the mast and a tackle located also on the boom. The free end hooks by a hook to one of the branches of the buckle in which is placed a stop so that the hook will not slide. On one of the branches of the buckle, the windsurfer's harness can be hooked during raising of the sail to facilitate this, ideally by a tackle in the harness itself. The extreme end of the halyard is elastic to facilitate the raising of the sail and hooking on the hook.

[0022] The mast is also formed by three removable pieces instead of two pieces, which is normal in most present boards. In this way transport is facilitated and the lower part of the mast can be left permanently joined to the mast foot.

[0023] In another embodiment, a flap and/or cover can be included with the sail blocking hook on the stem in the lowered position to avoid injury to the feet of the windsurfer. In addition, the restraining end of the folded position of the base can be changed in order to avoid forcing the hinges, with a removable extension with an end fixing with coupling closure to another hook placed on the lower part of the stern of the base.

[0024] To avoid injury to the feet of the windsurfer, the bolts that ensure the closure of the covers on the seatings of the wheels in the base may be substituted with elastic rubbers that ensure the closure of the respective seatings and/or the opening of the wheels by their corresponding holding to both end protections or widenings of prolongations to the axis of each wheel.

[0025] The invention includes a lower wing on the base, centered longitudinally to form a luff in front of the mast foot. This configuration improves the lateral support on the water in conjunction with the rudder, thus requiring a wing and rudder of smaller size than a conventional luff and rudder, avoiding them touching the ground under water and also giving a strong pull against overturning when sailing rapidly. This configuration is similar to the canard configuration in aeronautics. So that the wing maintains its stability, it has a pivoting movement limited to 3° on each side of a central position, making this movement around a pivotal support for the wing located behind the center of pressure of water against the same. The limitation of turning movement is made by means of a groove in the board. A projecting peg above the wing that forms a stop at the ends of the groove. The pivoting movement includes a spring that tends to maintain the central position of the wing and smooth the transitions of the turn of the wing from one side to another. This lower wing can also be mounted in positions behind the foot of the mast for very rapid sailing conditions.

[0026] In addition, the wing can incorporate a directional part instead of having it on the rudder. In this case, it has a horizontal support turning with the wing to hold the covered cables that govern the movement of its directional part, in order to make the turns of the wing independent of the turn of the directional part.

[0027] In an alternative embodiment, to simplify the mounting and/or dismounting of the sail, the upper stretch of the control buckle can include some gears attached to the turn of the turning grips, that connect in a crown with an axle that is removable and placed inside the mast, directly or through a gimbal, seating in one of various tackles placed at different heights. This allows the mounting of the boom at different heights. The axle of the crown has a cotter hole through which is passed an internal extended part from the tackles that connects the turn of the tackles with the axle of the crown.

[0028] The tackles are fixed by clamps to a cable that interconnects them when turning, and also is fixed by clamps to a lower tackle that has an eccentric lever with an end bolt that couples to a pair of transmission bushings, and the cable has a tightening mechanism that allows it to extend and contract by variations in the external temperature.

[0029] In addition, the compartment made with a cover to place the activation balance weight of the moveable part of the rubber and access to another watertight compartment has a finger-activated slide with a retraction spring.

[0030] To avoid possible tears in the sail or its supplement in case of a lateral overturn of the sail with misalignment with respect to the axis of the base, the skirt can incorporate upper and lower end ribs. The upper swinging rib is attached by its front end to the axle of a ring in the foot of the mast, and the lower by its end or front part, to the joint of the mast foot. Both ribs are joined at their rear ends by a bar joined in a hinge to the upper rib and by a gimbal joint to the lower rib, with the lower rib having underneath a piece of foam rubber or similar that adapts to the curvature of the base so that air cannot escape. The ribs have some grooves along which pass the lower part, extended in this case, of the sail. This lower extension is intended to keep the sail within the groove at all times. Also, the lower rib can be held by an upper lip to the foot of the mast.

[0031] In another embodiment, a brace and stretching is made on the free end of the sail using cross-heads that are held in shrouds and that hold the ends of the sail points. The shrouds can be rigid or flexible cables and are held at the upper end by a point on the sail and at the lower end to the boom, incorporating some intermediate tensors. With this configuration, the bend of the profile of the sail can be smoothed when the wind strikes it. The sail behaves like a floating wing placed vertically and a slight curvature of the same, about 8°, on the part nearest to the halyard is necessary so that it will be stable. However, sails on present boards can bend up to 20° which lowers output. By stretching the free edge of the sail, this torsion is smoothed and output improved.

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other objects and features of the present invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.

[0033] In the drawings, wherein similar reference characters denote similar elements throughout the several views:

[0034] FIG. 1 shows a view of the board of the invention;

[0035] FIG. 2 shows a sectioned lateral view of the base of the board of the invention;

[0036] FIG. 3 shows the underside of the base of the board of the invention;

[0037] FIG. 4 shows a view of the folding of the base of the board of the invention;

[0038] FIG. 5 shows a transversal section of the base of the board of the invention;

[0039] FIG. 6 shows a detail of the compartment in the stem of the base of the board of the invention;

[0040] FIG. 7 shows a front view of the foot of the mast of the board of the invention;

[0041] FIG. 8 shows a side view of the foot of the mast of the board of the invention;

[0042] FIG. 9 shows a view in perspective of the board of the invention;

[0043] FIG. 10 shows a sectional detail of a grip of the control buckle of the rudder of the board of the invention;

[0044] FIG. 11 shows schematically the upper part of the control buckle of the rudder of the board of the invention;

[0045] FIG. 12 shows a detail in section of a roller on the harness cable of the board of the invention;

[0046] FIG. 13 shows a section of XIII-XIII of FIG. 12;

[0047] FIG. 14 shows a view of the internal casing of a roller for the harness cable of the board of the invention;

[0048] FIG. 15 shows a view of the external casing of a roller for the harness cable of the board of the invention;

[0049] FIG. 16 shows a front view with the sail lowered on the board of the invention;

[0050] FIG. 17 shows a view of the lower addition to the sail on the board of the invention;

[0051] FIG. 18 shows a view of the turning support of the lower addition to the sail on the board of the invention;

[0052] FIG. 19 shows an upper view of the foot of the mast on the board of the invention;

[0053] FIG. 20 shows a view of the sail on the board of the invention in its configuration with three removable pieces and the stretching of its free side by cross-heads fixed to halyards;

[0054] FIG. 21 shows a view of the folding of the base of the board of the invention and a variation in making the shape to ensure its folding;

[0055] FIG. 22 shows a detail of the removable hook and bar to hold the folded position of the base;

[0056] FIGS. 23 and 24 show from below and in section some details of the fixing in the unfolded and removed position of the wheels on the base of the board of the invention in the variation of holding them by rubber bands;

[0057] FIG. 25 shows a detail of the advanced wing on the board of the invention;

[0058] FIG. 26 shows a view of the versatile placement of the advanced wing on the board of the invention;

[0059] FIGS. 27 and 28 show details of the advanced wing that include a directional portion;

[0060] FIG. 29 shows a detail of the control of the directional portion of the advanced wing on the board of the invention;

[0061] FIGS. 30 and 31 show details of the control buckle on the board of the invention in the variation of construction with tackles inside the mast;

[0062] FIG. 32 shows a detail of the access cover to the compartment with the rudder controls and which is watertight on the board of the invention, which incorporates the seating slide;

[0063] FIG. 33 shows a view of the upper and lower ribs on the sail addition; and

[0064] FIG. 34 shows a section of a variation in forming the support holding the mast foot to the base, where the cover that holds the lower rib of the lower addition to the sail can be seen.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0065] Referring now in detail to the drawings, windsurfing board 1 of the invention is formed by a base 2 and a sail 3 mounted on a mast 4, with a steering boom 5.

[0066] Base 2 can be folded by means of an almost centered joint 6 that is formed by two hidden hinges 7 and two crab claws 8 that hold its unfolded opposition.

[0067] In the front part of base 2 are two compartments 9 for two wheels 10 that can be hidden, mounted in two moveable half covers 11 that cover the compartments during sailing. Wheels 10 are held in their external position by other moveable half covers 12 on compartments 9, that are held by bolts 13 that pass through the axis. The folded position of the base is ensured by a cable 14 fixed to the stem, and which is hooked by a ring 15 to a point 16 made in the stern part of the base. During sailing, this cable is held fixed in ring 15 to an anchoring point 17 placed in the upper part of the stem of the base.

[0068] Under base 2 is a rudder 18 held by a rear turning portion 19 to control board 1. The movement of part 19 is carried out by an upper end lever placed in a compartment 21 with a hinged cover 22 and this lever is controlled by a control buckle activated from boom 5. Control buckle 23 has some cables 24, some turning grips 25 placed on branches 5a and 5b of the boom and a transmission 26 located at the foot 27 of the mast, that allows the free turn of mast 4 on base 2. Cables 24 have rollers 24a on the inside of compartment 21 that absorb extensions caused by the movement of the mast. From compartment 21, another compartment 28 is reached with a watertight cover 29.

[0069] The foot of mast 27 is fixed sliding with a block along guides 30 having a trapezoidal section in base 2, with sliders 31. Guides 30 are accessible through joint 6 when the base is folded. The blocking of the sliding position of the mast is carried out by a bolt 32 that is placed in holes 33 made in the surface of base 2.

[0070] Foot 27 of the mast is formed by a cup 34 formed by two perpendicular turn axes 35, 36. The movements of this cup are limited by stops 37, 38 that impede mast 4 from touching the surface of board 1 during lateral and rear lowering movements, which improves the handling of board 1 in the water when not sailing and avoids the hands and feet of the windsurfer from being held, and also makes it easier to raise the sail since it will not submerge. The forward movements of mast 4 are limited by another stop 39 in a slightly advanced position, which avoids falls forward by the windsurfer when turning into wind or when there is a slowing down. All the stops have portions of elastomer 40 that cushion shocks and preserve the material.

[0071] The coupling of mast 4 to its foot 27 are by means of a bolt 41 emerging from the foot. Bolt 41 is inserted in a hole 42 in the base of mast 4 and has a groove 43 where a lock 44 is passed to unblock the holding.

[0072] Each of lateral branches 5a and 5b of the boom have two straight lengths 45, 46, and mounted on length 45 to the front are turning grips 25 on the rudder control buckle. Each of these grips has two throats 49 in which are set cables 24, on one of them a length of the same from the transmission on the foot of the mast 41 while the other has a length from the turning grip of the branch opposite the boom, so that the turn of one of the grips simultaneously causes the turn of the rudder and the other turning grip.

[0073] On the rear stretch 46 of each of the lateral branches of the boom is a roller 50 that can be blocked by a cable 51 that holds a harness, not shown, that holds the windsurfer. The roller has a drum 52, a recovery flap 53 and a toothed end 54 where a portion of the block 55 is inserted that forms part of a handle 56 which has a spring 57 that forces the seating. The drum is mounted inside a double casing formed by two pieces 58, 59 of concentric cylinders, one of which 58 has a longitudinal groove 60, and the other 59 a helicoidal groove 61. The windsurfer can turn part 59 by an indentation 59 a at its end, round the piece 58, superimposing both grooves that leave an orifice by which the cable 51 passes, longitudinally regulating its outlet position to seek a point of equilibrium that shares out the forces holding the boom to each arm.

[0074] Also on this length 46 of each branch of the boom are floats 62 that help to avoid the sinking of the sail in case of a fall, aiding in its raising.

[0075] To raise the sail, the boom has a halyard 63 that during sailing is held in a buckle that passes over a lug 64 placed in the base of mast 4 and a tackle 65 on the end of the boom, with an end loop 66 that closes the buckle before which is an elastic zone 67. on the hooking branch of the buckle is a stop 67 a that stops the ring from sliding. On the other branch 68 of the buckle is a hook 69 for the harness of the windsurfer on raising the sail, making this easier.

[0076] Freeing the buckle of halyard 63, the end of this can be fixed to anchoring point 17 on the stem of base 2, passing under it so that due to the stops of the cup 34 the sail is held in the lowered position, making it easier to manage the board in the water when not sailing.

[0077] The transmission 26 of the rudder control buckle is formed by a casing 70 sliding in a vertical direction along cup 41 of the coupling of the mast to the foot of the mast. Casing 70 holds another casing 71 concentric and also moving vertically in the cup but with independent turning movements in both casings. Casing 71 is moved by a connecting rod 72 and an axle 73 coupled to a balancing rod 74 where are fixed the ends of the upper part from the turning grips of the cable 24 of the rudder control buckle. Casing 70 laterally activates another connecting rod 77 to which are attached the ends of the lower stretch that moves the balancing rod 20 of the rudder with the cables 24 of the rudder control buckle. In this way, the turn between casings 70 and 71 allows the free turn of the mast with respect to the mast foot, and also allows the rudder to be controller.

[0078] Because the foot of mast 4 has a considerable height, the lower edge of the sail is very high. Therefore there is a lower addition 78, the top of which is fixed to the sail and the bottom to a turning support 79 that slides on a circular rail 80 placed at the foot of mast 4.

[0079] As shown in FIG. 20, mast 4 is formed by three pieces 2′ which facilitate its transport, and the lower piece 3′ of mast 4 can be permanently attached to the mast foot.

[0080] In another embodiment, the base can have a removable hook 4′ on the stem to avoid injury to the feet of the windsurfer and a removable length 5′ to hold the folded position of the base without forcing its hinges. The length 5′ has an end holding piece 6′ with a closure for coupling to a hook 7′ placed in the stern of the board.

[0081] Also as shown in FIGS. 23 and 24, axis 8′ of the retractable wheels 10 on the base can have end prolongations with widened ends 10′ to ensure their retracted and/or extended position by means of rubbers 11′ to avoid injury to the feet of the windsurfer.

[0082] The base incorporates, centered longitudinally, a lower front wing 12′, preferably in front or also behind the foot of the mast, that improves the lateral support against the water in combination with rudder 18, reducing the necessary dimensions of the rudder and as a conventional center board. The base has cuts 13′ through which the wing passes in the joint of the base, as shown in FIG. 21. The wing 12′ has a pivoting movement around a support 14′, caused by the forward position with respect to the support of the center of pressure 14a′, and the wing has a rod 15′ standing out that runs in a groove 16′ whose ends limit the pivoting movement to some 3° on each side, and a recovery spring 17′ that tends to hold the wing centered and also smooths its transitions or turns.

[0083] As shown in FIG. 27, wing 12′ may have a directional portion 18′, and rudder 18 does not have one. Also in this case, cables 19′ encased to activate portion 18′ are mounted on a support 20′ moving with the pivoting turn of the wing in order to make the pivoting of wing 12′ independent of directional part 18′.

[0084] The upper part of the control buckle of the directional part of the rudder, or the wing, can also be implemented by gears 21′ connected to the turn of the turning grips 25 of both branches 5a and 5b of the boom, that connect with a crown 24′ whose axis 25′ is removable inside the mast 4, seating in one of various tackles 26′ placed at different heights, so that the boom can be mounted at different heights by inserting the axis 25′ in one or another of the tackles 26′. The insertion makes the turn of the axis 25′ and the tackle by a cotter pin hole 27′ in which is placed an extended portion 28′ of each of the tackles.

[0085] The tackles are held by clamps 29′ and a cable 30′ that interconnect them mechanically to each other and to a lower tackle 31′ that has an eccentric lever 32′ with a bolt 33′ at the end that attaches to the casings 70, 71 of the control buckle transmission, including a tensor 35′ that ensures the tightness of the cable and also allows it to be stretched and/or shortened by variations in the external temperature.

[0086] The cover 22 of compartment 21 giving access to the rudder gear on the base may have a seating in its closed position via a slider 38′ activated by the finger through a hole 39′, with a recovery spring 39 a that is held in a hole 40′ to this effect.

[0087] The lower skirt or addition 78 to the sail can also be mounted by two ribs, upper rib 42′ and lower rib 43′, with the upper rib held to the axis of a ring at the foot of the mast, not shown, by means of holes 44′ and the lower rib to the joint of the mast foot. Both ribs are held in the rear part by a rod 45′ joined by a hinge 46′ to the upper rib and by a cup 47′ to the lower one, and the ribs have channels 48′ where the lower part of the sail passes. On the lower part of the rib 43′ there is a portion of foam rubber 49′ that adapts to the curvature of the base and avoids the escape of air.

[0088] Lower rib 43′ is held in a turning direction to the support 49a′ of the mast foot as shown in FIG. 34, by means of an upper bolt 49b′ that holds it in position.

[0089] Also as shown in FIG. 20, the sail on the board has shrouds 50′ that hold cross-bars 51′ to stretch the free edge of the sail, held at the end of some points 51′ on the same. Shrouds 50′ are held at the upper end to one of the upper points and below to both branches 5a, 5b of the boom, and have intermediate tensors 53′. In this way, the output of the sail is optimized because twisting is decreased.

[0090] Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.

Claims

1. A windsurfing board, comprising: a base that slides on the surface of water, said base having a folding joint and a stem; a mast having a foot, a sail and a boom with two lateral branches, said mast being connected to the base; a plurality of facing compartments in the base with a cover for concealed wheels and another compartment with a watertight cover to hold documents; at least one rudder with a moveable part activated by means of a control buckle formed by cables connected to the base; turning activation grips located on both lateral branches of the boom and a transmission that allows a turning movement of the mast with respect to the base without cables entwining; guides, accessible from the folding joint of the base, for sliding and blockable coupling of the mast foot, said guides having sliders and at least one blocking bolt that seats in some holes made in a surface of the base; a control buckle for the rudder located inside the foot of the mast, the foot of the mast having a cup joint formed by two perpendicular axes with stops to limit movement and elastomer shock absorbing portions; two rollers on both branches of the boom for two cables to hold a windsurfer's harness, said rollers having a recovery spring and means for blocking the rolling of the cable; a float located in an end rear part of each branch of the boom; a halyard to raise the sail looped between a lug at the base of the mast and a pulley at an end of the boom, said halyard having an external elastic piece, a retaining hook at an end of the halyard, and a stop for the sliding movement of the hook along branches of an edge, wherein on at least one branch of the loop of the halyard is fixed at least one pulley for a harness for a windsurfer during the raising of the sail; an anchoring point on the stem of the base for the hook at the end of the halyard for handling the board in water when not sailing; an addition on a lower edge of the sail, wherein a lower edge of said addition is fixed to a turning support attached to the foot of the mast.

2. A board according to claim 1, wherein the folding joint on the base has hidden hinges and holding claws for an unfolded position, and further comprising a cable with a hook fixed to a prow of the base, said hook hooking onto a point on a stern of the base to maintain a folded position.

3. A board according to claim 1, wherein each of the seating compartments for the wheels has two swinging half covers, wherein the wheel is set on one half-cover and wherein the other half cover holds a removed position of the wheel by an end bolt.

4. A board according to claim 1, wherein a moveable part of the rudder is activated by cables of the control buckle by means of an end balance, said cables being located in an access compartment that can be opened, and further comprising a watertight cover through which access is also given to the compartment, wherein the cables inside the access compartment are rolled in a manner to absorb their extension.

5. A board according to claim 1, wherein transmission of the control buckle has two concentric casings inside each other that slide together and vertically along a coupling bolt in the foot of the mast, with both casings being independent in their turning movement, wherein ends of the cables having turning grips are attached to one of the casings by an external balance, an articulated rod and an axle, and coupled to the other casing by an axle, an articulated rod and another end balance are the ends of the cables of the control buckle that acts on a moveable portion of the rudder.

6. A board according to claim 4, wherein the cables have rollers holding the harness of the windsurfer, said rollers having a roller drum activated by a strip, said drum having an end widening with radial grooves, wherein an outer blocking part of a handle with return spring is inserted in said radial grooves, wherein the drum is mounted on an inside of a casing formed by two concentric cylindrical pieces; one of the cylindrical pieces having a longitudinal groove and the other a helicoidal groove for outlet of a harness holding cable, wherein the external one of the two pieces has a turning movement on the inside one of the two pieces, regulating a longitudinal position of the outlet of the harness holding cable.

7. A board according to claim 1, wherein the halyard passes under an area of the stem of the base and has an external hook fixed in an anchoring point on an upper part of the stem, to immobilize the sail in a lowered position.

8. A board according to claim 1, wherein the mast of the sail is formed in three removable pieces.

9. A board according to claim 1, wherein the base has a concealed hook on the stem and a concealed extender to hold a folded position of the base, said extender having an end fixing with a coupling closure to a hook on a lower part of the stem of the base.

10. A board according to claim 1, wherein an axis of the concealed wheels have end prolongations with widened ends to hook on rubbers to ensure a concealed and/or open position.

11. A board according to claim 1, wherein the base has a front wing centered in a longitudinal direction, said front wing adapted to be installed in various positions, and being fixed to the base by a pivot and incorporating a recovery spring for its centered position and stops for a pivoting movement to each side.

12. A board according to claim 11, wherein the stops are formed by ends of a groove in the base along which runs an upper projecting rod on the wing.

13. A board according to claim 12, wherein the wing has a directional part and activation cables which are mounted on a support attached to the pivoting movement of the wing.

14. A board according to claim 13, wherein an upper part of the control buckle has gears attached to the boom that mesh with a crown with a coupling axis at various heights, direct through a joint, to one of various pulleys placed inside the mast at various heights, with the coupling of the axle and the pulleys turning together; wherein the axle and pulleys are joined together mechanically and with another lower pulley by a cable with clamps, wherein said lower pulley has an eccentric lever with an end bolt for coupling to the transmission casings of the mast foot of the control buckle.

15. A board according to claim 4, wherein the cover of the access compartment has a mechanically inset closure by a finger-activated slider and a recovery spring.

16. A board according to claim 1, wherein the lower addition to the sail is mounted by two upper and lower holding ribs, wherein the upper rib is fixed swinging by its forward part to an axle of a ring at the mast foot, while the lower rib is fixed by its front part and turning to a joint of the mast foot, both ribs having rear parts that are joined by a rod or extension that is fixed-by hinges to the upper rib and by a cup to the lower rib, both ribs having channels through which pass the lower part extended below of the sail, with the lower rib having a lower elastic portion to adapt to a curvature of the base and seal off passage of air.

17. A board according to claim 1, wherein the sail has holding shrouds connected to stretching cross pieces on a free side of the sail, said holding shrouds being fixed to ends of the cross pieces, wherein the shrouds are held at an upper end to an upper point of the sail and at a lower end to both lateral branches of the boom, and wherein the shrouds have intermediate tensors.

18. A board according to claim 16, wherein the foot of the mast has an upper lug to hold the lower rib.