EP3405386B1 - Mast and corresponding rig, in particular for a surfboard - Google Patents

Description

The invention relates to a mast and an associated rig.

Windsurfing continues to enjoy great popularity.

Decisive in addition to the design of the actual surfboard is especially the design of the rig, i. the design of the corresponding mast, the sail held above and the boom. Another important factor is the attachment of the boom to the mast and the way in which the sail surrounded by the boom can be trimmed at the end of the mast.

In such Riggs is important that the sail has the largest possible sail area. This sail area can be increased in width or upwards in principle. However, when you look up, the force needed to hold the sail increases (over the boom) too, especially in strong winds. In addition, changes over the height of the sail, the angle of attack, so that the wind flow breaks off differently and thereby the efficiency is reduced.

Therefore, it is known to make a widening of the sail to increase the sail area. The mast is stretched arcuately when separating the sail, so that the sail is under tension in the vertical direction. This, however, again the trim possibility, i. limited the adaptation of the sail tension to different wind speeds. In addition, a large number of battens is usually required to avoid fluttering of the sail.

Finally, the recent rig constructions are also relatively difficult, which in particular a start in the water is difficult.

A generic Rigg is from the DE 84 01 722 U1 known. It shows a mast with a mast core and a mast casing, the mast casing is made of an elastic lightweight foam, which is externally provided with a waterproof coating with high tensile strength.

The mast core itself has a circular cross-section. However, its mast casing results in a cross-sectional shape deviating from the cross-sectional shape, namely with a profile cross-section which is designed drop-shaped. At the tapered end of the drop profile is a groove for receiving a luff of a sail intended. In this case, the mast is articulated in the longitudinal direction in three parts, a central portion which serves to attach a boom head, and one above and one below section.

A similar rig is on the FR 2 470 725 A1 known. It shows a mast with a mast core and a mast jacket. The mast core has an oval-shaped cross-section.

From the US 4,593,638 is also to be taken as a known rig, which comprises a cross-sectionally round mast, which is surrounded by a so-called inner sleeve, which is open to the rear to receive a sail and hold.

An anchorage of a sail to a mast comparable in principle to the abovementioned prior publications or technically equivalent is also known from US Pat DE 85 01 047 U1 to be known as known.

A corresponding rig with comparatively complicated attachment of the boom head to a mast is for example from the DE 84 07 643 U1 known. The mast is typically formed as in most cases as a circular mast.

Also from DE 84 09 888 U1 If so far a similar rig with a circular cross-section mast as known to remove. Again, the sail is raised by means of a mast pocket on the mast. The mast is permanently bent, the bend should be stronger at the top of the mast than at the bottom of the mast. The boom itself is rotatably mounted with its boom head on the mast. The space between the mast and the inside of the mast pocket is lined with a buoyant insert, preferably made of soft foam. This should improve the buoyancy of the mast.

The most diverse designs of a mast are also from the EP 0 155 012 A1 known. So is in FIG. 1 in this Vorveröffentlichung schematically shown a cylindrical mast in cross section. Based on FIG. 2 is a profiled mast reproduced in cross section, which has a teardrop shape. At the tapered end of this drop profile is introduced a cross-sectionally T-shaped or T-like groove, about which a sail can be introduced and held by means of a bead formed on the sail. In both cases, these are straight masts that are not arcuate in nature.

The aforementioned prepublished EP 0 155 012 A1 In contrast to a previously known round mast cross-section or a previously known profiled mast cross-section deviating from the circular shape, a much more elaborate construction precedes this, assuming a round mast in which the entire area in front of and behind the mast is covered by a complex construction is. This design of the lining and surrounding the round mast structure recreates a sail bag in which then the slats can end to stiffen the sail.

In summary, it can be stated that, according to the prior art, the proposed masts are predominantly straight and of circular cross-section. The mast deflection, which is necessary for a sail profile, can then be achieved only by very great effort with the help of trim blocks. This also means that the material of the sail considerably more stable and must be reinforced in many places. This makes the sail but also heavier, stiffer and more expensive. In addition, especially at low wind results in a poor profile and thus less propulsion. In addition, the generally used slats to improve propulsion are also difficult and expensive to trim.

Against this background, it is an object of the present invention, an improved rig and / or improved parts of a rig such. to provide an improved mast, whereby i.a. preferably unwanted, the propulsion speed reducing turbulence can be avoided.

The object is achieved according to the invention with respect to a mast according to claim 1 and with respect to a mast Riggs according to the features specified in claim 16. Advantageous embodiments of the invention are specified in the subclaims.

The invention is based on a mast which has a profile deviating from a circular shape at least over its essential longitudinal extent.

The mast according to the invention is namely provided with a teardrop-shaped or similar cross-sectional profile, wherein at the tapered end of the drop profile, a groove is formed. In this provided with undercut groove, the sail can be introduced and held with a corresponding anchoring portion. For this, the sail can be a corresponding in the undercut having the groove engaging thickening or corresponding engaging and retaining element.

By this configuration, therefore, a conventional mast pocket on the sail, what a conventional sail is mounted on a mast, no longer provided. Above all, this mast pocket can not then run full of water, so that a water start is significantly simplified because the weights to be lifted when lifting the sail and thus the rig are overall lower.

Finally, the droplet-shaped profiling of the mast results in the desired cross-sectional shape over which the wind can strike optimally over the sail surface, without the handling deteriorating and the propulsion forces reducing turbulence or significant turbulence occurring.

In a fixing section for a boom head (ie a boom front arch) of the mast according to the invention is provided in a relatively small part length with a different from the drop-shaped profiling profiling. This profile is designed so that at this point a boom head can be attached. The mast attachment is designed so that the boom can be freely rotated in this area relative to the mast, so can be pivoted about the mast axis in the region of this attachment portion from left to right. For this purpose, the mast according to the invention preferably has a circular profile in cross-section. This facilitates the overall handling considerable compared to previously known solutions. So it is here, for example, different from the DE 84 09 888 U1 deliberately waived a non-rotatable connection between the boom and mast or avoided such a solid connection.

The mast is preferably made of plastic. In particular, a variant is preferred in which the mast is made of carbon fiber reinforced plastic or comprises or substantially comprises carbon fiber reinforced plastic. In addition, in a preferred variant of the invention, it is provided that the mast is not designed as a straight running, profiled in cross-section rod, but that the mast from home from sickle or whip-shaped bent is formed. As a result, the ultimately necessary trim forces for the sail can be significantly reduced, and this with a corresponding bow shape of the mast desired recoverable large sail area.

Finally, it is provided in a development of the invention that the boom head is attached by means of a hollow cylindrical connecting element to the straight portion of the mast. As a result, the preferred rotational or rotational movement of the boom is achieved in total compared to the mast in a simple manner.

It is already with reference to the above EP 0 155 012 A1 has been explained that in addition mast shapes are known which have a deviating from the circular shape, for example in the form of a drop profile, which also comprise at the tapered end of the drop profile a corresponding groove for anchoring a sail. It is in the prior art only provided that the mast is invariably provided over its entire length with a corresponding groove, so in deviation from the present invention has no section which preferably has a rotational profile, that here an anchorable pivoting body can be attached to maintain a boom head, the opposite Mast is freely pivotable. In the conventional solution, the boom should be rotatably connected to the mast.

Moreover, in this known prior art, as also already mentioned, always a straight running mast, which is designed in contrast to a preferred embodiment of the invention is not arcuate from home.

In addition, the above leads EP 0 155 012 A1 away from the present invention. For in the aforementioned prior publication, not only known solutions with a circular mast cross-section, but also with a profiled mast cross section (to form a drop profile) are described as previously known, but it is deviating proposed as contrast improved solution a mast with a round cross-section, the is laminated and clad with an additional device. This panel comprises a so-called leading edge arranged on the mast front part, which runs laterally on the cross-sectionally cylindrical mast and merges on the rear side of the mast in a drop-shaped cross-sectional taper, in the interior of the batten pockets with the slats used in the batten of the sail end up.

In contrast, the invention has a number of advantages.

One of the advantages is the use of a mast profiled in cross-section, wherein at the tapered end of the drop profile having a mast on the groove provided there ultimately the sail can be hung, which is basically known. Based on this, the advantage is achieved that can be dispensed with a mast pocket, so that the rig can be easily pulled out of the water, as can accumulate in the mast pocket no water, which must be raised with.

In the context of the invention, however, it is further provided that the profiled cross section of the mast is not realized over the entire length. At least in the height range or section in which the boom, ie in particular a boom head, is attached, the mast is preferably cylindrical. Here, a sleeve, a sleeve and / or eg holding jaws are preferably provided, so that at this point a boom, in particular a boom head (ie a so-called boom front arch) by means of a boom-mast fastening device on the mast around this rotatable anchored. In other words, here no rotatable connection between a boom and a mast is realized, however, allows a relative rotation or -verschwenkung at least in a partial area around the mast around.

The boom is thus preferably fixed by means of said boom-mast holding device to said sleeve or the like, which is penetrated by the mast in the attachment region of the boom head. This boom-mast holding device is thus preferably rotatably mounted on a rotation or rotational movement permitting, preferably cylindrical cross-section portion of the mast, which has the advantage that by slight wind pressure folding the sail is achieved, so always in every situation an aerodynamically perfect transition from the mast to the sail is realized.

This is rotatably mounted on a cylindrical recess on the mast and allows slight wind pressure folding the sail, which in any situation always an aerodynamically perfect transition from the mast to the sail is achieved.

Preferably, the mast itself is not straight running, but also in side view sickle-shaped or sickle-like.

In addition to the use of the cross-sectional profiled mast, such a pre-bent or permanently bent mast offers the possibility of passing through the luff by light draft (unlike conventional sails where the mast has to be bent by extremely pushing the luff). In addition, profile-supporting battens can be supported directly on the mast.

Overall, it requires only low clamping forces to allow a corresponding belly on the sail.

Finally, the mast according to the invention can also be designed to be divisible, preferably in the area or section in which the boom or the boom head is attached to the mast.

The aforementioned preferably sleeve-shaped or sleeve-like connecting element has a channel-shaped receptacle with a preferably circular inner cross-section, about which the illustrated connecting element is rotatably arranged on the corresponding cylindrical mast section, i. is preferably arranged freely rotatable at least in a partial angle range.

At this rotatable connection element, the boom, i. the boom head, attach with appropriate measures. This ensures that the boom head at least indirectly rotatable relative to the mast via the preferably sleeve-shaped connecting element, i. is pivotally supported relative to the mast.

The aforementioned preferably sleeve-shaped or sleeve-like connecting element, which is rotatably or pivotally mounted around the mast in the mentioned attachment portion for a boom attachable or may be formed as a separate connection element, on which, for example, the mentioned boom mast holding device can be mounted again. But it is also possible that the said boom-mast holding device is a corresponding sleeve-like or sleeve-shaped connecting element itself includes and is provided as a common component available, which around the mast, as explained, is pivotally mounted and ultimately serves to anchor a boom head. Here, in a further and insofar alternative embodiment, the aforementioned preferably sleeve-shaped or sleeve-like connecting element is also provided with an external thread. The aforementioned inner bore in the boom-mast holding device is further provided with an internal thread, so that the introduced in the mast receiving opening sleeve is rotatably arranged by means of the threaded engagement in this mast receiving opening. This allows a smooth and easy height adjustment for the attachment point of a boom head relative to the mast height make complementary.

Even if the connecting element is not made of a threaded sleeve, but of a simple sleeve which is rotatable on the mast or relative to the mast in the circumferential direction, this also offers the possibility that the boom head in different height adjustment of this sleeve, so ultimately can be attached to the mast in different height settings. Because the boom head can be fastened over the entire axial length of the sleeve away in a simple manner, so that in this way a different height adjustment or height fixation of the boom head relative to the mast can be achieved.

In other words, this ultimately allows an optimal, aerodynamic transition from the mast to the sail. Even at the lowest sail pressure, the sail belly can be reached as desired.

• weniger Segeltuch vorzusehen,
• ein dünneres Segel einzusetzen
• leichtere Segellatten zu verwenden,
• auf Trimmblöcke zu verzichten,
• die Wasseraufnahme vor einem Wasserstart deutlich zu verringern (Wegfall der Masttasche),

wodurch letztlich das erfindungsgemäße Rigg auch mit deutlich geringeren Kosten herstellbar ist.Finally, the low trim forces achieved in the context of the invention also contribute to a considerable weight saving. Because this makes it possible:

• to provide less canvas,
• to use a thinner sail
• to use lighter battens,
• to dispense with trim blocks,
• significantly reduce the water absorption before a water start (omission of the mast pocket),

whereby ultimately the inventive rig can be produced at significantly lower cost.

Figur 1:

eine schematische Seitenansicht auf ein Rigg eines Surfbrettes;

Figur 2a:

eine schematische Seitenansicht eines erfindungsgemäßen ausgestalteten teilbaren Mastes;

Figur 2b:

eine ähnliche Darstellung zu Figur 2a in zerlegter Form des Mastes;

Figur 2c:

ein vergrößerter Ausschnitt eines Teilbereichs des Mastes unter Darstellung einer Hülse;

Figur 3a bis 3d:

verschiedene Querschnitte durch den Mast in unterschiedlicher Höhe des Mastes;

Figur 3e:

eine abgewandelte Querschnittsdarstellung durch den Mast in Höhe des Gabelbaumkopf-Befestigungsabschnittes;

Figur 4:

eine schematische Draufsicht auf eine Gabelbaum-Mast-Halteeinrichtung 35, worüber ein Gabelbaum gegenüber dem Mast drehbar befestigbar ist, und zwar in der Fixierstellung;

Figur 5:

eine zu Figur 4 vergleichbare Darstellung, bei der der Gabelbaum von seiner Funktionsstellung unter dem Mastende hindurch nach vorne in seine gelöste Stellung verschwenkt ist;

Figur 6:

eine schematische Seitendarstellung, in der der Gabelbaum in seine Außereingriffsstellung (gelöste Stellung) vor den Mast verschwenkt ist;

Figur 7a:

eine schematische auszugsweise Querschnittsdarstellung (parallel zum Mast) zur Darstellung der Ausbildung der seitlichen Anlageabschnitte der Masthalterung zur Anlage des Gabelbaumkopfes;

Figur 7b:

eine entsprechende Darstellung zu Figur 7a bezüglich des mittleren Anlageabschnittes der Masthalterung zur Anlage des Gabelbaumkopfes;

Figur 8:

eine schematische rückwärtige Ansicht eines abgewandelten Ausführungsbeispieles mit einer Höhenverstelleinrichtung für den Gabelbaumkopf.

The invention will be explained in more detail with reference to drawings. In detail:

FIG. 1:

a schematic side view of a rig of a surfboard;

FIG. 2a:

a schematic side view of an inventive designed divisible mast;

FIG. 2b:

a similar representation too FIG. 2a in disassembled form of the mast;

FIG. 2c:

an enlarged section of a portion of the mast, showing a sleeve;

FIGS. 3a to 3d:

different cross sections through the mast at different heights of the mast;

FIG. 3e:

a modified cross-sectional view through the mast at the level of the boom head mounting portion;

FIG. 4:

a schematic plan view of a boom-mast holding device 35, about which a boom relative to the mast is rotatably fastened, in the fixing position;

FIG. 5:

one too FIG. 4 comparable representation in which the boom is pivoted from its functional position under the mast end forward in its released position;

FIG. 6:

a schematic side view in which the boom is pivoted in its disengaged position (released position) in front of the mast;

FIG. 7a:

a schematic excerpts cross-sectional view (parallel to the mast) to illustrate the formation of the lateral abutment portions of the mast holder for conditioning of the boom head;

FIG. 7b:

a corresponding representation too Figure 7a with respect to the middle abutment portion of the mast holder for the installation of the boom head;

FIG. 8:

a schematic rear view of a modified embodiment with a height adjustment device for the boom head.

In FIG. 1 is shown in schematic side view a rig with a sail 1. In this case, the sail is attached to his luff 3 to a mast 5, which in turn is freely rotatably and pivotally arranged on a mast foot joint 7 (universal joint 7) on a only partially indicated sailboard 8 on all sides.

Such a sail 1 is usually at its rear end 9, so at its so-called clew 9, on a sail 1 surrounding the boom 11, i. at the end of the boom 11a, trimmed.

From the schematic page representation according to FIG. 1 It can also be seen that the sail in the longitudinal direction of the mast offset from the luff 3 to the leech 4 (or partially to the lower berth 2b) extending and sewn into the sail 1 batten pockets 2a, are usually used in the corresponding slats 2b for stiffening the sail ,

The aforementioned mast 5 can basically consist of a straight mast. In the context of the invention, however, a permanently bent mast 5 is preferably used. The bend at the upper end of the mast 5 is usually even stronger than in the lower portion of the mast 5. In other words, the mast is thus at least partially, and preferably curved at least towards its upper end or more curved. The curvature can be referred to simply as crescent-shaped or sickle-like, although conventional sickles usually have a much greater curvature than that in FIG FIG. 1 Mast 5 shown in side view. This ultimately allows a larger sail area, without the need to increase the height of the sail. This can also be ensured that the holding force against the wind pressure does not increase significantly.

Due to the aforementioned trim at the rear end of the sail of the aforementioned mast - regardless of whether he is basically straight or even from home slightly arcuate, so permanently arched designed - slightly further bent by the introduced trim forces at least in the upper area.

Usually, in a partial length region of the mast 5, to which the leading end of the boom 33 is attached to the mast 5, a corresponding recess 1a of a sail 1 is provided, so that the leading end of the boom here preferably (as explained below is at least indirectly) attached to the exposed mast can be.

It is already mentioned at this point that the mast 5 in the mentioned attachment area, in which the boom head preferably indirectly attached to the mast 5 is, has a straight section. However, this straight running attachment portion 105 on the mast is not only provided when the mast as a whole is straight, but also when (as preferred and executed in FIG. 1 represented) of the mast in its essential longitudinal extent of home, so it is permanently curved.

In FIG. 2a is shown in a schematic side view of the mast 5 in side view without associated sail and without a boom schematically in a preferred variant. From this variant it can be seen that the mast 5 is ultimately divided into three sections, namely in a so-called mast lower part 5a with a length 5'a, in a so-called mast upper part 5b with a length 5'b and in a mast base 5a and the Mast upper part 5b connecting mast connection portion 5c with a length 5'c. This mast connection section 5c can also be firmly connected to either the master base 5a or the mast top 5b and / or formed, preferably formed in one piece. In the illustrated embodiment, the mast connection part 5c is an integral part of the mast lower part 5a, as shown in the schematic side view FIG. 2b can be seen. Because in FIG. 2b the mast 5 is reproduced in its decomposed form.

The aforementioned mast connection part 5c at the same time forms the so-called. Fork-head fastening portion 105 to which a later-explained boom head of a boom can be attached and held.

The mast upper part 5b has for this purpose a channel-shaped receiving opening 5d, which may be formed in the illustrated embodiment as a round bore or blind hole. Here, preferably in cross-section cylindrical mast connecting portion 5c is inserted into the lower end of the mast upper part 5b, preferably plugged limit stop, until both parts are connected together. At this point, shortly beforehand Figure 2c referenced in which the lower end of Mastoberteiles 5 b, the underlying lower end of the mast lower part 5 a and the intervening mast connection part 5 c are shown, in which a rotary body 25 relative to the mast rotatably or pivotally mounted and held, which will be discussed in more detail below.

The thus formed and thereby dismantled mast 5 is ultimately held firmly bound together by the wound-up and trimmed sail 1 with its components.

Based on Figure 3a, Figure 3b, Figure 3c such as 3d figure are different cross sections along the lines IIa-IIa, IIb-IIb, IIc-IIc and IId-IId in FIG. 2a played.

It can be seen that the actual mast 5 has a deviating from the circular shape profiling, with an at least approximately drop-shaped or drop-like cross-section. By this resulting in cross-section drop shape of the mast 5 is on its leading side 15 partially circular generally convex with a semi-circular in cross-section or semicircle-like, ie preferably semi-cylindrical portion 19 a designed, which then merges to its trailing end 17 in an increasingly tapered in section portion 19 b, in the trailing end of which is designed with an undercut 21 groove 22 is introduced. However, the arched shape 19a in the leading portion 15 of the drop-shaped mast profile can be configured in wide ranges with any radius or with any radius changing. Aerodynamic shapes are preferably realized.

From the cross-sectional view according to FIG. 3b It can be seen that this cross-sectional representation preferably has the greatest transverse and longitudinal extent, that is, in the amount of the end face areas of the upper part of the mast and the lower part of the mast which are to be superimposed on one another. In other words, the upper end of the mast lower part 5a and the lower end of the mast upper part 5b each adjacent to the mast connecting portion 5c on the usually largest longitudinal and transverse extent, ie once in the direction of the sail 1 and in the transverse direction thereto. At the top end of the mast, that is to say at the so-called mast top 5e, this mast cross-section is again markedly smaller. Similarly, the mast lower part 5a may be formed from its mast connecting portion 5c to the mast foot at least by a small amount with a slowly or partially tapered mast cross section, as based on 3d figure is indicated. However, this can also be dispensed with, so that the mast lower part over its entire length has a more or less constant cross-section, to his mast but also with an increasingly larger cross-section can be provided. Here are any modifications possible.

The cross-sectional view according to Figure 3c shows that the mast connection portion 5c again has or may have a cylindrical or hollow cylindrical shape. Generally, a cross-sectional shape is preferred here, which allows a body allowing a rotation or pivoting to be placed here, which can then be rotated or pivoted about this fastening section 105.

Based on the schematic cross-sectional view according to FIG. 3e is alternative to the circular cross-sectional view according to FIG Figure 3c shown that also different from the circular shape other cross sections for the boom mounting portion 105 are possible. Axially symmetrical cross-sectional shapes are preferably realized. Based on Figure 4e It is shown that, for example, a more square cross-sectional shape can be used with corresponding rounded corners, so that a patch here sleeve or corresponding cuff or holding jaw-shaped abutment portions 39 are supported on this example, rounded edges or corners of the provided with such a cross-section boom attachment portion 105 can. This also allows a possible backlash-free rotation of the sleeve 25 can be realized about the boom mounting portion 105. Further, insofar as desired, any modifications are possible.

In the mentioned, the mast in its entire length (except for the length of the mast connection section 5c) trained groove 22, the luff 3 of the sail 1 can be inserted by means of a thickened approach in the longitudinal direction of the groove 22 and thereby anchored securely on the mast 5. In this case, the mentioned recess 1a comes to lie on the luff 3 of the sail 1 on the trailing side 17 of the mast in height of the mast connecting portion 5c.

Such a mast is preferably made of plastic, which is sufficiently stable and at least still slightly elastically deformable in order to trim a corresponding sail can. Preferably, the mast consists of a CFRP material, ie carbon fiber plastic or carbon fiber reinforced plastic. Just this embodiment also allows the mast according to the invention from home in an at least slightly curved, i. Crescent-shaped or sickle-like configuration can be configured with permanent curvature, whereby significant advantages of the invention can be realized.

As from the page presentation according to FIGS. 2a and 2b can be seen, the explained mast 5 is preferably wide curved, that is at least partially formed slightly curved over its length, so that there is a sickle-shaped or sickle-like shape. In other words, the mast from its foot to its upper mast head at least over its essential longitudinal extension sections arcuate or at least slightly arcuate designed, preferably continuously arcuate, in particular to its foot end out still a straight section can be provided. But even in the case in which the mast of home (that is permanent) arcuately curved or arc-shaped curved portions, the so-called mast connection portion 5c, which ultimately forms a fixing portion 105, straight, ie formed without bending. This opens up the possibility that here a pivoting body in the form of the so-called boom-mast holding device 35 with a receiving bore 37 or a receiving channel 37 (FIG. FIGS. 4 and 5 ) can be placed on the mounting portion 105, so that the boom-mast support means 35 can be rotated or pivoted about this mast connecting portion 105 due to the straight mast connecting portion 105. The resulting benefits will be discussed later.

Based on Figure 2c is, as already mentioned, an enlarged section of the mast connecting portion 5c and the adjoining mast lower part 5a and the mast upper part 5b shown in a perspective view.

From this it can already be seen that on the mast base 5a connecting the mast top 5b mast connecting portion 5c mounted on this portion rotatable, in particular at least in an angular range around the mast 5 freely rotatable rotating body 25 attached, in particular plugged.

The length of this rotating or pivoting body 25 preferably has a dimension which is at least slightly shorter than the distance D between the upper end or boundary side 5 "a of the mast lower part 5a and the downwardly facing end or boundary side 5" b of the mast upper part 5b. This distance D results, when the mast with its two parts 5a and 5b as shown in FIG FIG. 2a is plugged together. As a result, the rotating body 25 is rotatable about the axis of the mast connecting part 5c and / or pivotable or at least freely rotatable and / or pivotable by a certain angular extent. At the same time, the pivoting body 25 is held in the axial direction more or less immovable limit stop (apart from a possibly provided small game).

In the preferred embodiment according to the Figures 1 to 3d extends through the mast 5, ie at least the mast connecting portion 5c, the rotary body 25 passing through the receiving bore 5d, said rotary body 25 preferably in the manner of a sleeve 25a or as will be shown later, may be formed in the manner of a threaded sleeve 25b. The aforementioned sleeve-shaped rotary body 25 is designed with its receiving bore 5d as well as the mast connecting portion 5c passing through it straight, so not arcuate, so that here the mentioned desired rotation or rotation or pivoting movement of the pivot body 25 relative to the mast or the Mast axis is possible. In other words, the inner diameter of the receiving bore 5b of the swivel body 25 is preferably at least slightly larger than the outer diameter of the mast in this attachment region, ie at least slightly larger than the outer diameter of the mast connection section 5c. However, the seat should be as free of play as possible.

Below will be discussed with reference to other figures on an inventive attachment of the boom on the mast.

In FIG. 4 is a partial cross-sectional view through the mast 5 at the level of the mast connection portion 5c shown, directly above the front end of the boom, which is also referred to below as the boom head 33 or boom front arch 33. The variant according to FIGS. 4 and 5 a first embodiment of a possible boom-mast attachment. According to this embodiment, the boom-mast fixing and / or holding device comprises a boom-mast holding device 35, which is preferably made of plastic. In particular, this boom-mast holding device 35 is made in the form of a one-piece plastic part 35a. This boom-mast holding device 35 is hereinafter also referred to in part as a boom-mast holding device 35.

This boom-mast holding device 35 with a holding body 35b has a mast receiving opening 37. In other words, the in FIG. 1 shown mast 5 at least in the region of the cross-sectional view according to FIG. 4 perpendicular to the drawing plane E. In unloaded starting position, ie in particular without wind, the mast 5 runs in the in FIG. 4 dot-dashed symmetry or median plane S and is bent from its lower mast foot joint 7 to its overhead mast top 8 usually backwards, ie to its rearward or trailing end 17.

The illustrated boom-mast-holding device 35 is designed cuff, haltebacken- or sleeve-shaped and includes at least two opposite holding portions 39, which in the assembled state ultimately at least indirectly surround the mast 5 extending through the mast receiving opening 37 in the embodiment shown. The mast 5 is therefore indirectly encompassed, because on the mast 5 here in the region of the mast connecting portion 5c of the aforementioned rotary body 25 is attached in the form of a sleeve 25a and freely rotatable here. The sleeve 25a is in the side view according to Figure 2c shown. In this case, the arrangement according to FIG. 4 be such that the baking, cuff or sleeve-shaped holding portions 39 are not circumferentially closed, but spaced on their trailing side 17 end to each other, preferably on both sides of the plane of symmetry S, whereby here a trailing distance or slot 41 is formed.

On the leading side 15, the boom-mast-holding device 35 is in FIG. 4 shown cross-section transverse to the central axis 5 'of the mast 5 (at least in the mast receiving opening 37) T- or n-shaped or double-winged or double-wing-like design, wherein in addition to a central boom installation section 43 adjoining lateral boom installation sections 44a and 44b are formed.

The central boom installation section 43 may, for example, have a length (in the plane of the drawing E) transverse to the plane of symmetry S which is of the order of the diameter of the mast reception opening 37. For example, over 40%, in particular over 50%, 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130% or 140% of the diameter of the mast receiving opening 47 are preferably suitable. On the other hand, this width or length of the central boom installation section 43 should be shorter than 150% of the diameter of the mast receiving opening 17, thus in particular shorter than 140%, 130%, 120%, 110%, 100%, 90%, 80%. , 70%, 60% or less than 50% of the diameter of the mast-receiving opening 37.

In an appropriate order of magnitude, the respective length of the lateral boom-bearing portions 44a, 44b may be formed, which are aligned symmetrically to the plane of symmetry S relative to the central boom-section 43 slightly trailing, so strongly divergent to each other. The angle α between the sloping in the trailing direction abutment edge 44a, 44b of the corresponding boom section and a parallel to the mast axis 5 '(ie at least in the mounting region of the boom or the mast axis 5' of the mast connecting portion 5c) and perpendicular to the plane of symmetry S. extending plane E1 is at least approximately designed according to the course of the boom. Such an angle can vary in this range, usually between 10 ° to 60 °, in particular 20 ° to 40 °, etc. There are no restrictions in this respect.

In this case, the aforementioned two side armature abutment sections 44a, 44b may also be slightly convex to its leading end, according to the course and the shape of the boom front arch 33, which is often referred to as the boom head 33.

Finally, from the illustration according to FIG. 4 Also to see that still a clamping element 49 is provided, in the illustrated embodiment in the form of a closed circumferential webbing 49a. Here comes every possible embodiment for a continuous tensioning strap 49 in question, which is as inextensible as possible, that is not elastic and can absorb high tensile forces.

In the exemplary embodiment shown, the belt loop 49 with a predetermined defined length encloses the boom once on the left side of the plane of symmetry S and once on the right side of the plane of symmetry S, then in each case in an upper and a lower plane around the outer circumference of the baking, cuff or sleeve-shaped mast abutment portion 39 of the boom-mast-holding device 35 to encompass.

In FIG. 4 while the boom 11 is shown with his boom front sheet 33 in a stretched and fixed to the mounting portion 105 of the mast 5 position. In this position, the two side boom front side portions 33a and 33b are in the region of their trailing outer wall portion at least partially to the corresponding leading abutment portions in the region of the side armature abutment portions 44a and 44b. In this position - as will be discussed later - the leading boom front arch middle portion 33c is raised at its trailing side from a corresponding central boom engaging portion 43 of the bracket body 35a of the boom mast support 35 to form a distance A. Here, A1 is the length of the distance between the middle of the boom front bow center section 33c and the center of the mast receiving opening 37. The importance of the distance A or the length of the measure A1 will be discussed later.

In the illustration according to FIG. 4 For example, the relative position of the boom or boom head to the boom mast support 35 is shown, especially under wind load (in FIG. 4 Coming from the right), for example, the sail bulges to the left while the entire mast 5 and its central axis 5 'is rotated clockwise so that the in FIG. 4 indicated drop-shaped profiling of the mast lower part 5a (and also the mast top 5b) in the illustration according to FIG. 4 are turned clockwise to the left. At the end of the profile is also shown dotted, which assumes the position of the sail 1 running from there. Already from this it can be seen that there is an optimal contour between profiled mast and subsequent sail, about which optimal (turbulence or low turbulence) propulsive forces can be generated.

Based on FIG. 5 is referring to FIG. 4 the position of the boom or the boom front arch shown before the boom is firmly locked to a mast.

According to FIG. 6 is doing side view of the boom of his in FIG. 1 shown functional position (ie before disarming the clew, ie at the end of the boom) under the mast 5 of the mast 1 pivoted away in a leading position.

In this initial situation before trimming, therefore, the two boom front side portions 33a and 33b are lifted from the respective side boom engaging portions 44a, 44b of the boom mast holder 35 so that only the boom front arc center portion 33c is attached to a corresponding center boom engaging portion But can not be necessary. Because in this starting position of the boom front arch center portion 33c comes closer to the center 5 'of the mast receiving opening 37 and thus of the mast 5 to lie, so that the aforementioned strap 49, for example, the circumferentially closed webbing 49a is no longer under tension, but only rotates loosely , as in FIG. 5 is shown. In this position, therefore, the boom 11, which passes through the corresponding wrapping of the webbing 49 a, easily rotatable, ie easily to a transverse to the central axis 5 a of the mast 5 extending axis, which extends in or approximately in the drawing plane E.

The distance between the center of the boom front arch middle section 33c to the center 5 'of the mast receiving opening 17 (and thus to the center of the mast 5) is designated by the reference A2. This dimension A2 is significantly smaller, that is shorter than the longitudinal dimension A1 in FIG. 4 ,

For fixed fixation of the boom 11 on the mast 5 then ultimately the boom 11 of his in FIG. 6 shown position (in which the entire boom 11 is leading in front of the mast against its final functional position) when viewed from the side in accordance with FIG. 6 in the counterclockwise direction along the arrow 41st be pivoted within the tensioning element 49 (webbing 49a) until its end of the boom 11a in the in FIG. 1 shown and in FIG. 6 dashed lines indicated functional position is located. During this pivotal movement about its pivotal axis X passing through the boom front arc central portion 33a in the longitudinal direction thereof, the two boom front arc side portions 33a and 33b run on the side boom engaging portions 44a and 44b of the boom mast support 35, respectively, whereby the boom front arc center portion 33c is lifted off the corresponding central boom-abutting portion 43. As a result, the tensioning element 49 is preferably carried along and tensioned accordingly in the form of the webbing 49a. Since the length of the webbing 49a is defined exactly so that the final in FIGS. 1 and 4 reproduced clamping position can be achieved, but only under extreme introduction of clamping forces on the strap 49, the optimal fixation of the boom 11, ie the boom head 33 is realized on the aforementioned rotary body 25, here in the form of the sleeve 25a, on the corresponding section 5c the mast 5 as possible without play, but is held rotatable or pivotable. It is off FIG. 4 Also, it can be seen that now the distance A1 between the middle of the boom front arch center portion 33a and the center of the mast receiving opening 37 with respect to the length of the distance A2 according to FIG. 5 has significantly increased, whereby in cooperation with the clamping band 49, the desired high clamping forces are generated. The aforementioned tensioning element 49, preferably in the form of the tensioning element 49 or the strap 49a, fulfills the function of a boom-holding device 149.

Important and interesting in this context is that with the illustrated fastening device of the boom head 33 at different locations, ie at different altitudes on the rotary body 25 can be fixed here in the form of the aforementioned sleeve 25a. Because the fastening device always acts between the boom head 33 and sleeve. Due to the different attachment point in different height of the rotary body 25 in particular in the form of the sleeve 25 a so that a different fixation in different altitude of the boom head relative to the mast 5 can be achieved. The longer the sleeve 25a, the larger the available fixing area or the available fixing point for the boom head 33.

As based on Figure 7a As can be seen, the side boom attachment portions 44a, 44b in vertical cross-sectional view (perpendicular to the plane of FIG FIG. 4 or 5 ) correspondingly slightly concave between an upper and a lower edge 53, whereby the corresponding spar-like boom side arc-side portions 33a, 33b in these concave side armature abutment portions 44a, 44b can be rotated well guided and applied. Accordingly, the middle boom-conditioning section could be designed. According to the sectional view according to FIG. 7b this section is formed only partially recessed with respect to an upper and lower edge 53 and does not have to be exactly concave in between, but may be designed only in the manner of a flat bottom 54 having recess 52.

In the illustrated embodiment, preferably using a slotted sleeve, the corresponding holding jaws 39 can enclose the preferably sleeve-shaped rotary body 25 at the corresponding abutment sections, wherein the high clamping forces generated by the boom front arch and thus the entire boom in the front area on this boom mast holding device 35 fixed or largely fixed to the rotary body 25 is fixed, which in turn can pivot or rotate about the mast connecting portion 5c. At least in a sufficiently large angular range. In this case, the mast holder is at least at their leading and partly in their lateral surface portions on the outer circumference of the preferably sleeve-shaped rotating or pivoting body 25 at. At the same time can be brought by the strap of the boom with its rear end of the boom in the corresponding optimum height where the end of the sail can be trimmed. For a pivoting of the boom in the webbing 49a is quite possible. Through the entire holder thus results in a free or largely free pivoting of the boom with the sleeve-shaped VerDrehkörper 25 around the mast 5 around, the sleeve-shaped VerDrehkörper 25 even in the longitudinal direction of the mast between the mast lower part 5a and the MastOberteil 5b held quasi axially immovable or centered.

It is based on FIG. 5 in deviation to FIG. 4 also shown that the boom-mast holding device 35 must have no jaw or sleeve-shaped holding or fixing sections 39, but that the Fork boom mast support means 35 and slot-free and thus may be formed closed to form a corresponding receiving opening 37 for the explained preferably sleeve-shaped rotary body 25, which in turn is then rotatably mounted on the mast.

According to the illustrated variant, the mast holder 15 thus sits with its jaw, sleeve or sleeve-shaped sections directly on the rotary body 25, preferably the mentioned sleeve 25a, thus embraces the rotary body 25. In this case, the rotary body 25 with an inner diameter with respect to the rotary body 25th provided, which, as mentioned, at least slightly larger than the outer diameter of the mast 5 in this mounting area (mast connection portion 5c), so that with fixed fixation between the boom and boom mast support means 35 of the boom with the associated boom Mast support means 35 and also fixed relative to the boom mast support means 35 sleeve 37 can then rotate freely on the corresponding portion of the mast, which offers a number of advantages with respect to the alignment of the sail with the rig.

As explained, the boom-mast holding device 35 is preferably designed as a separate component relative to the sleeve, sleeve or jaw-shaped or similar rotary body 25. This allows the possibility that 25 different fork-mast fastening devices can be attached to this rotary body. Therefore, it is noted at this point that this rotary body 25 of home can be part of the boom-mast holding device 35, so a Part of the rotary body 25 represents. In this case, the receiving or fixing sections 39 (which ultimately define the mast receiving opening 37 or the mast receiving channel 37 thus formed) would be placed directly on the outer circumference of the mast section 5c to receive corresponding tilting moments relative to the mast 5 (ie, for example, before the mast lower part 5a is assembled with the mast top 5b to a unitary structure). The length of the mast receiving channel 37 and thus the axial length of the holding or fixing sections 39 in this case will preferably have a greater longitudinal extent than that of FIG FIG. 1 is indicated or for an embodiment explained below based on FIG. 8 results.

Quite generally, this longitudinal extent of the sleeve, cuff or clamping jaw-like holding or fixing section 39 and the rotary body 25 formed thereby can be designed completely differently. The axial dimension (longitudinal dimension) with which the boom-mast holding device 35 attaches directly or with the interposition of a separate, preferably sleeve-shaped rotating body 25 to the mounting portion 105 of the mast 5, for example, greater than at least 2cm, in particular greater than 3cm, 4cm , 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm and 15cm. Similarly, it is usually sufficient if this longitudinal dimension is smaller than 30cm, especially smaller than 23cm, 22cm, 21cm, 20cm, 19cm, 18cm, 17cm, 16cm, 15cm, 14cm, 13cm, 12cm, 11cm, 10cm, 9cm, 8cm , 7cm, 6cm and 5cm.

In the variant discussed below according to the FIG. 8 is instead of in FIGS. 4 and 5 shown sleeve 25a, a threaded sleeve 25b is used and used, which is also straight and sits on a straight portion of the mast 5 sits (namely on the boom mounting portion 105, which is formed in the embodiment shown by the connecting portion 5c). These threaded sleeve 25b has an inner diameter which is at least slightly larger than the outer diameter of the mast 5 in this area, so that the threaded sleeve as easily as possible about its own longitudinal axis (ie central axis 5a) can be rotated.

The boom-mast holding device 35 itself has in this embodiment, a mast mounting portion with a mast receiving opening 37, which is designed for example as a slotted, but preferably non-slotted (ie closed), hollow cylindrical boom mast holding device 35, with a corresponding Internal thread 35c. Otherwise, the structure of this embodiment is basically identical to the previously described embodiments. In other words, the boom-mast holding device 35 otherwise as based on FIGS. 4 and 5 basically explained.

This construction now using a threaded sleeve 35, which interacts with a corresponding internal thread in the receiving bore 37 of the boom mast holding device 35, offers the possibility that the surfer if necessary by turning the seated on the mast threaded sleeve 25b about its own longitudinal axis not rotating Boom-mast fixture 35 can change the altitude of the boom-mast attachment 35. Again, an optimization of the overall alignment and the trim of the sail between the mast and boom and a preferred height adjustment of the boom can be carried out, and with the simplest means.

Optionally, a snap-like end lock may be provided so that the threaded sleeve 137 does not turn automatically or undesirably during surfing and thus can cause an undesirable height adjustment.

The dimensioning of the longitudinal extension of the threaded sleeve and / or the cuff and jaw-like or provided with a corresponding internal threaded bore portion of the boom-mast support means 35 may be similar to the previous embodiment, which inter alia also with reference to FIGS. 4 and 5 been explained.

Finally, it is mentioned that in order to increase the absorption forces, the boom-mast holding device 35 can still be configured with two opposite ribs 53, in particular plastic ribs 53, which are arranged between the baking, sleeve or sleeve-shaped holding sections 39 to the respective adjacent boom. Bearing sections 44a and 44b extend.

• dass der Mastaufnahme-Kanal (37) geschlossen und damit hülsenförmig oder manschetten- oder haltebackenförmig mit einem auf der nachlaufenden Seite (17) des Mastaufnahmekanals (37) parallel zu dessen Längsrichtung verlaufenden Schlitz (41) gebildet ist,
• dass der Gabelbaumkopf (33) um eine quer zur Axialerstreckung des Mastaufnahmekanals (37) verlaufende Verschwenkachse (X) drehbar gehalten ist,
• dass der Haltekörper (35b) einen mittleren Gabelbaum-Anlageabschnitt (43) umfasst, an den sich jeweils gegenüberliegend ein Gabelbaumfrontbogen-Seitenabschnitt (33a, 33b) anschließt, wobei beide Gabelbaumfrontbogen-Seitenabschnitte (33a, 33b) stark divergierend zueinander verlaufen,
• dass der Gabelbaumkopf (33) in seiner am Haltekörper (35b) fixierten Stellung so positioniert ist, dass der Gabelbaumfrontbogen-Mittenabschnitt (33c) von einem mittleren Gabelbaum-Anlageabschnitt (43) des Haltekörpers (35b) abgehoben ist, derart, dass sich die beiden an den Gabelbaumfrontbogen-Mittenabschnitt (33c) anschließenden Gabelbaumfrontbogen-Seitenabschnitte (33a, 33b) an den beiden Gabelbaum-Anlageabschnitten (44a, 44b) abstützen, die sich gegenüberliegend an den mittig dazu vorgesehenen Gabelbaum-Anlageabschnitt (43) des Haltekörpers (35b) anschließen,
• dass die Gabelbaumkopf-Halteeinrichtung (149) ein Spannelement (49) vorzugsweise in Form eines Gurtbandes (49a) umfasst, worüber ein Gabelbaumkopf (33) an dem Haltekörper (35b) gehalten ist,
• dass das Spannelement (49) unelastisch und dabei flexibel ist, insbesondere verformbar oder biegbar ist,
• dass das Spannelement (49) aus einem umlaufend geschlossenen Spannelement (49) besteht, welches in zwei übereinander liegenden Ebenen in zwei parallelen Schlaufen auf der rückwärtigen Seite (17) um die manschetten-, haltebacken- oder hülsenförmigen Mastaufnahmekanal-Wandungen (137) zum einen und von dort jeweils um den Gabelbaumkopf (33) in zwei seitlich versetzt liegenden Ebenen am Gabelbaumkopf (33) herum verläuft,
• dass der Mastaufnahmekanal (37) als Teil des Haltekörpers (35b) ausgebildet ist oder dass im Mastaufnahmekanal (37) eine Hülse (25a) vorgesehen ist, die im montierten Zustand vom Mast (5), insbesondere von einem am Mast (5) befindlichen Gabelbaumkopf-Befestigungsabschnitt (105) durchsetzt ist, der zwischen einem Mastunterteil (5a) und einem sich in Verlängerung dazu vorgesehenen Mastoberteil (5b) ausgebildet ist,
• dass im montierten Zustand des Gabelbaums (11) der Haltekörper (35b) der Gabelbaum-Mast-Befestigungseinrichtung (35) an der Hülse (25a, 25b) so fixiert ist, dass der Gabelbaum (11) mit der Hülse (25a, 25b) gemeinsam um den Mast-Verbindungsabschnitt (5c) verschwenkbar ist,
• dass der Gabelbaumfrontbogen-Seitenabschnitt (33a, 33b) in unterschiedlicher Höhenlage, d.h. an unterschiedlicher Stelle in Längsrichtung des hülsenförmigen Drehkörpers (25) und damit in unterschiedlicher Höhenlage bezogen auf den Mast (5) befestigbar ist,
• dass eine Höhenverstelleinrichtung für die Befestigungsstelle des Gabelbaumkopfes (33) bezogen auf den Mast (5) vorgesehen ist,
• dass die Hülse (25a, 25b) als Gewindehülse (25b) ausgebildet ist, wobei der Mastaufnahmekanal (37) mit einem Innengewinde versehen ist, derart, dass die Gewindehülse (25b) mit ihrem Außengewinde in dem Innengewinde des Mastaufnahmekanals (37) verdrehbar angeordnet ist, wodurch die Höhenlage der Befestigungsstelle des Gabelbaums (33) bezogen auf den Mast (5) veränderbar und/oder unterschiedlich einstellbar ist.

Hereinafter, even more preferred variants with respect to a rig with a mast according to the invention will be explained. These preferred variants are characterized, inter alia, by the following features:

• that the mast-receiving channel (37) is closed and thus sleeve-shaped or cuff-shaped or holding-jaw-shaped with a slot (41) running parallel to its longitudinal direction on the trailing side (17) of the mast-receiving channel (37),
• in that the boom head (33) is held rotatably about a pivoting axis (X) extending transversely to the axial extent of the mast receiving passage (37),
• in that the holding body (35b) comprises a central boom attachment section (43), which is adjoined in each case by a boom front side section (33a, 33b), wherein both boom front side sections (33a, 33b) are highly divergent,
• in that the boom head (33) is positioned in its position fixed to the support body (35b) such that the boom front arc center portion (33c) is raised from a central boom engaging portion (43) of the support body (35b), such that the two abutting on the boom front arc center portion (33c), boom side arc side portions (33a, 33b) on the two boom abutment portions (44a, 44b), which adjoin the centrally provided for this purpose boom support portion (43) of the holding body (35b) .
• in that the boom head holding device (149) has a tensioning element (49), preferably in the form of a strap (49a), via which a boom head (33) is held on the holding body (35b),
• that the tensioning element (49) is inelastic and at the same time flexible, in particular deformable or bendable,
• in that the clamping element (49) consists of a circumferentially closed clamping element (49), which in two superimposed planes in two parallel loops on the rear side (17) around the sleeve, holding jaw or sleeve-shaped Mastaufnahmekanal-walls (137) on the one hand and from there in each case around the boom head (33) in two laterally offset planes on the boom head (33) around,
• in that the mast receiving channel (37) is formed as part of the holding body (35b) or that a sleeve (25a) is provided in the mast receiving channel (37) which, in the assembled state, is from the mast (5), in particular from a boom head located on the mast (5) -Fixing portion (105) is interspersed, which is formed between a mast lower part (5a) and a mast top part (5b) provided in extension thereto,
• that in the assembled state of the boom (11) of the holding body (35 b) of the boom-mast fastening means (35) on the sleeve (25 a, 25 b) is fixed so that the boom (11) with the sleeve (25 a, 25 b) in common about the mast connecting portion (5c) is pivotable,
• in that the boom front arc side section (33a, 33b) can be fastened at different altitudes, ie at different points in the longitudinal direction of the sleeve-shaped rotary body (25) and thus at different altitudes relative to the mast (5),
• a height adjustment device is provided for the attachment point of the boom head (33) relative to the mast (5),
• in that the sleeve (25a, 25b) is designed as a threaded sleeve (25b), wherein the mast receiving channel (37) is provided with an internal thread, such that the threaded sleeve (25b) with its external thread is rotatably arranged in the internal thread of the mast receiving channel (37) whereby the altitude of the attachment point of the boom (33) relative to the mast (5) is variable and / or different adjustable.

Claims (15)

1. Mast for a rig for a surfboard, comprising the following features:

   - comprising a mast (5),

   - the mast (5) is provided, in the longitudinal direction thereof, with a profile cross section that is transverse to the mast longitudinal direction and differs from a circular shape,

   - the profile cross section is drop-shaped or drop-like in the form of a drop profile,

   - a groove (21), provided with an undercut (22), is provided on the mast (5) at the tapering end of the drop profile in order to receive a luff (3) of a sail (1),

   - the mast (5), in the longitudinal direction thereof, is divided into at least three parts, specifically into a bottom mast part (5a), into a top mast part (5b) and into a boom-head fastening portion (105) formed between the bottom mast part (5a) and the top mast part (5b),

   - the boom-head fastening portion (105) is provided with a cross section that differs from the drop profile,

   - the cross section in the boom-head fastening portion (105) is designed such that a rotary body (25) placed on the boom-head fastening portion (105) of the mast (5) by means of the hole in said body can be rotated or pivoted about the boom-head fastening portion (105), and

   - the bottom mast part (5a) and the top mast part (5b) of the mast (5) consist of plastics material or include plastics material, optionally with the addition of a reinforcement consisting of metal, glass fibres and/or carbon fibres.
2. Mast according to claim 1, characterised in that the boom-head fastening portion (105) also consists of plastics material or includes plastics material, optionally with the addition of a reinforcement consisting of metal, glass fibres and/or carbon fibres.
3. Mast according to either claim 1 or claim 2, characterised in that the boom-head fastening portion (105) is axially symmetrical, and in particular rotationally symmetrical with respect to the longitudinal extension thereof.
4. Mast according to any of claims 1 to 3, characterised in that the boom-head fastening portion (105) is designed as a mast connection portion (5c) that interconnects the bottom mast part (5a) and the top mast part (5b), the boom-head fastening portion (105) preferably being designed as a mast connection portion (5c) by means of which the bottom mast part (5a) and the top mast part (5b) are or can be interconnected in the form of a plug-in connection.
5. Mast according to any of claims 1 to 4, characterised in that the length of the boom-head fastening portion (105) is greater than 2 cm, in particular greater than 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, 10 cm, 11 cm, 12 cm, 13 cm, 14 cm, 15 cm, 16 cm, 17 cm and 18 cm and/or in that the length of the fastening portion (105) is shorter than 20 cm, in particular shorter than 19 cm, 18 cm, 17 cm, 16 cm, 15 cm, 14 cm, 13 cm, 12 cm, 11 cm, 10 cm, 9 cm, 8 cm, 7 cm, 6 cm and 5 cm.
6. Mast according to any of claims 1 to 5, characterised in that the mast (5) can be dismantled at least

   a) into two parts, specifically into the bottom mast part (5a) and into the top mast part (5b), the boom-head fastening portion (105) being rigidly connected to the bottom mast part (5a) or to the top mast part (5b), and it therefore being possible for the free end of the boom-head fastening portion (105) to be inserted into a receiving hole (5d) in the end face of the top mast part (5b) or in the end face of the bottom mast part (5a), or

   b) into three parts, specifically into a bottom mast part (5a), into a top mast part (5b) and into a mast connection portion (5c), the bottom mast part (5a), the top mast part (5b) and the boom-head fastening portion (105) located therebetween being detachably interconnected in the form of a plug-in and/or rotary connection.
7. Mast according to any of claims 1 to 6, characterised in that the mast (5) has a cross-sectional area that changes, at least in part, over the total length thereof, preferably decreasing towards the mast top (8).
8. Mast according to any of claims 1 to 7, characterised in that the mast (5) is curved or runs straight when untrimmed.
9. Mast according to any of claims 1 to 8, characterised in that a rotary body (25) is or can be placed on the boom-head fastening portion (105) and can be rotated or pivoted, at least completely freely or in a predefined angular range, about the boom-head fastening portion (105), the rotary body (25) preferably consisting of a bush (25a, 25b) or including a bush (25a, 25b).
10. Mast according to claim 9, characterised in that the rotary body (25), in particular in the form of a bush (25a, 25b), has a length in the longitudinal direction of the mast (5) and in particular of the boom-head fastening portion (105), that corresponds to or is marginally smaller than the free space between the end face at the top of the bottom mast part (5a) and the end face at the bottom of the top mast part (5b).
11. Mast according to any of claims 1 to 10, characterised in that the rotary body (25) has zero clearance or approximately zero clearance in the axial direction of the mast (5) and in particular in the axial direction of the mast connection portion (5c), and is therefore axially immovable.
12. Mast according to any of claims 1 to 11, characterised in that a boom-mast holding means (35) is further provided for fixing a boom front arch (33) or boom head (33) to the mast (5), which means includes the preferably bush-shaped rotary body (25) as part of the mast holder or can be placed on or is fastened to a rotary body (25).
13. Rig for a surfboard (8) comprising a sail (1), a boom (11) and a mast (5) according to at least one of claims 1 to 12.
14. Rig according to claim 13, characterised in that the boom-mast holding means (35) and/or the rotary body (25), preferably in the form of a bush (25a), is detachably anchorable to the mast (5) and in particular to the mast connection portion (5c) and forms a boom-head fastening portion (105).
15. Rig according to either claim 13 or claim 14, characterised by the following additional features,

    - the boom-mast holding means (35) includes a holding body (35b),

    - the holding body (35b) comprises a mast-receiving channel (37),

    - the holding body (35b) further includes a boom-head abutment portion (43, 44a, 44b) which is positioned in the leading direction (15) and extends transversely or perpendicularly to the central longitudinal axis (5') of the mast-receiving channel (37),

    - the boom-head abutment portion (43, 44a, 44b) on the holding body (35b) is designed so as to be offset from the mast-receiving channel (37) in the leading direction (15), and

    - a boom-head holding means (149) is provided which is part of the holding body (35b) or is fastened thereto and/or supported thereon.

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