Bar for kite surfing with a system for trimming a kite

Abstract

A bar (10) for kitesurfing includes a system for trimming a kite (100), the kite being connectable to the bar via a left control line (1) which is controllable with a left end of the bar and via a right control line (4) which is controllable with a right end of the bar. A winding element (15), that is actuatable from the left or right end of the bar and synchronously winds-up and unwinds a respective trim section of the left control line and right control line, is arranged within the bar. The winding element is movably mounted in the bar such that on actuation it rotates within the bar and with this moves axially, so that the respective trim section of the left control line and of the right control line is wound on the winding element with a winding diameter which is constant over its length.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a United States National Phase Application of International Application PCT / DE2023 / 200196, filed Sep. 21, 2023, and claims the benefit of priority under 35 U.S.C. §119 of German Application 20 2022 002 106.2, filed Sep. 22, 2022, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to a bar for kite surfing, with a system for trimming a kite. Alternatively to kite surfing, the bar can also be used for steering kites on land, for snowboarding with a kite or for beach sailing with a kite.BACKGROUND

[0003] Typically, a kite surfer is connected to the kite by a harness via front lines. The front lines are fastened to a front side of the kite and run together for the fastening, in order to be hooked in on the harness of the kite surfer. The kite is controlled by a bar which extends transversely to the front lines in front of the chest of the kite surfer within gripping distance and in the middle comprises an opening, said opening running transversely to the longitudinal axis of the bar and through which the front lines are led. The left end of the bar is connected to the kite via a left control line, also known as the left back line. The right end of the bar is connected to the kite via a right control line, also called the right back line. The left rear end of the kite can be pulled with the left control line and the right rear end of the kite can be pulled with the right control line.

[0004] The force with which the kite pulls the kite surfer depends on the one hand on the wind strength and on the other hand on the angle at which the kite is positioned to the wind. The kite surfer has no influence on the wind strength. However, the kite surfer can change the angular position of the kite to the wind as is desired by way of the travel direction and by trimming the kite. Given a high-strength wind, the engagement surface of the kite for the wind can be reduced by way of trimming, which is also denoted as depowering. In the case of a weaker wind, a greater engagement surface for the wind can be set by way of trimming, which is also denoted as powering.

[0005] Typically, the front lines are shortened for depowering and lengthened for powering. On depowering, the kite surfer pulls the front side of the kite downwards, so that the kite provides less engagement surface for the wind. The trimming via the front lines has several disadvantages. On the one hand 80% to 90% of the tensile force acts via the front lines, so that a pulley system is required on the front lines. This pulley system is less precise and not easy to operate whilst kite surfing. Moreover, it is of a hindrance to the field of view of the kite surfer.

[0006] A system for trimming a kite which avoids the trimming via front lines is known from EP 2 766 256 B1. Instead of this, the kite is trimmed via the control lines. By way of this, one can make do without the pulley system on the front lines. The trimming system of EP 2 766 256 B1 however has several disadvantages. Due to the fact that the left as well as the right control line must be wound onto at least one spool at one end of the bar, one of the control lines must be led completely through the bar up to the other end of the bar. Moreover, the trim displacement and the trimming force is increased depending on how full the at least one reel is wound.SUMMARY

[0007] It is an object of the present invention therefore to provide a kitesurfing bar with a system for trimming a kite which on the one hand makes do without a pulley system for trimming via the front lines and on the other hand permits a constantly adjustable trim displacement.

[0008] This object is achieved by a bar and a system for trimming a kite, according to the invention. Preferred embodiments of the invention can be derived from the description, the dependent claims and the drawings.

[0009] According to the invention, a bar for kitesurfing is provided, wherein the bar comprises a system for trimming a kite, said kite being connectable to the bar via a left control line which is controllable with a left end of the bar and via a right control line which is controllable with a right end of the bar, wherein a winding element which can be actuated from the left or right end of the bar and is for the synchronous winding-up and unwinding of a respective trim section of the left control line and right control line is arranged within the bar, wherein the winding element is movably mounted in the bar in a manner such that on actuation it rotates within the bar and with this moves axially, so that the respective trim section of the left control line and of the right control line is wound on the winding element with a winding diameter which is constant over its length.

[0010] In contrast to EP 2 766 256 B1 therefore, none of the control lines need to be led completely through the bar up to the other end of the bar. Instead, the winding element, for example in the form of a hollow or solid winding rod extends into the cavity of the bar. By way of the axial movement of the winding element during its rotation, the control lines do not wind on one another as with a spool which is known from EP 2 766 256 B1, but next to one another in the axial direction in an orderly manner, so that the winding diameter remains constant. This results in the trim displacement also remaining constant for all windings about the winding element.

[0011] Furthermore, on trimming via the control lines, it is also to be noted that the engagement surface of the kite for the wind is enlarged (powering) when the control lines are shortened. A depowering is therefore achieved if the control lines are lengthened. This is precisely the other way around on trimming via the front lines. The tensile force upon the control lines can therefore become increasing larger with the trim displacement on powering, so that a favourable as possible torque transmission ratio is desired. On account of the constant winding diameter on the winding element, a worsening of the torque transmission ratio as with a winding-up of the spool of EP 2 766 256 B1 is likewise avoided.

[0012] Here, it is to be noted that the control lines can be configured in each case in a one-part manner or also as two or more pieces which can be linked to one another. The control lines each as a whole or each as a part therefore can be preinstalled as a constituent of the bar. Alternatively to this, the bar can be configured without pre-installed control lines. The control lines each as a whole or as a piece thereof can then be installed into the bar at a later stage as a product which is separate from the bar. Preferably, at least a short piece of the two control lines are each preinstalled in the bar, so that a long control line piece can be linked to the bar outside this. The control line piece which is preinstalled in each case is then has such a length that it reaches out of the axial ends of the bar given a complete winding-up of the maximal trim displacement.

[0013] Since preferably floats, so-called floaters are arranged on the control lines where they are led onto the respective end of the bar, it is advantageous if the respective control line piece which is preinstalled in the bar is linked to a long control line piece in or on the respective floater. The floaters serve for the buoyancy of the bar in the water and due to the different colouring indicate to the kite surfer as to which is the left or right end of the bar. The floaters can likewise be a preinstalled constituent of the bar and / or be installed at a later stage as a separate product.

[0014] Optionally, the winding element can comprise a cylindrical-surface-like first, preferably left winding surface with the winding diameter and a cylindrical-surface-like second, preferably right winding surface with the winding diameter, wherein each winding of the wound-up trim section of the left control line lies completely on the first winding surface and each winding of the wound-up trim section of the right control line lies completely on the second winding surface. Preferably, the winding element is a solid or hollow winding rod, wherein the first winding surface and the second winding surface are each sections of an outer lateral surface of the winding rod. The winding element preferably has a circular cross section, but in principle can have any shaped cross section.

[0015] Optionally, the winding element can be mounted in a threaded and / or slotted guide, wherein the threaded and / or slotted guide is arranged to the left of the first winding surface or to the right of the second winding surface or axially between the first and or second winding surface. If the winding element is actuatable from the right end of the bar, it can then be advantageous if the threaded and / or slotted guide is not arranged to the right of the right winding surface, since the right control line does not then need to be deflected. Accordingly, it is advantageous for the threaded and / or slotted guide not to be arranged to the left of the left winding surface if the winding element is actuatable from the left end of the bar. The control line which is led to the winding element from the opposite end of the bar only needs to be deflected twice.

[0016] Optionally, the bar can comprise a manually actuatable actuation element which is arranged at the end of the bar, from which end the winding element can be actuated, wherein the winding element comprises an actuation axle which extends from the actuation element axially into the bar, wherein the actuation axle is coupled to the actuation element in a rotationally fixed and axially movable manner. The actuation element for example can be axially stuck onto the actuation axle and in the circumferential direction can form a positive fit with the actuation axle, for example in the form of a square socket, hexagonal socket or with axial webs. Alternatively to this or additionally, the actuation element can be coupled to the actuation axle by pins. The axially movable coupling between the actuation element and the actuation axle provides the winding element with the axial movement degree freedom of axially moving on rotation of the actuation element without the actuation element having to axially move herewith.

[0017] Optionally, the winding element can extend along a rotation axis and the actuation element can comprise an outer gripping surface whose radial distance to the rotation axis of the winding element is at least as large as the winding diameter, preferably twice as large. The winding element can accordingly be rotated more easily in a winding-up direction due to the corresponding lever effect. A complicated transmission mechanism as in EP 2 766 256 B1 is not necessary.

[0018] Optionally, the bar can comprise a detent system which in a blocking position latches on rotation of the winding element in an unwinding direction and prevents a further unwinding of the wound-up trim sections and in a release position does not latch on rotation of the winding element in the unwinding direction and herewith permits an unwinding of the wound-up trim sections.

[0019] Preferably, a manually actuatable actuation element is arranged at the end of the bar, from which end the winding element can be actuated, wherein the actuation element is coupled to the detent system such that the axial positioning of the actuation element determines whether the detent system is in the blocking position or release position. Preferably, the winding element is actuated by way of rotating the actuation element. If the actuation element is pulled out axially, the detent system is preferably set into a release position. If the actuation element is axially pressed in again, then the detent system is preferably set into the blocking position.

[0020] Optionally, the detent system can comprise n≥2, n∈ detents which are uniformly distributed in the circumferential direction and at least one detent lug which engages radially into the detents, wherein in the blocking position the at least one detent lug resiliently yields at each of the detents on rotation of the winding element in a winding-up direction which is opposite to the unwinding direction and thus permits the winding-up of the wound trim sections, and wherein the at least one detent lug resiliently springs back behind each yielded detent and by way of this generates an acoustic feedback. Since the actuation movement element can preferably be carried out with a supination movement which can be comfortably carried out up to approx. 150°, at least three detents which are uniformly distributed in the circumferential direction are advantageous, so that not more than 120° lies between the detents. The bar can be selectively configured for those who are left-handed or right-handed, so that the winding element is actuatable from the respective end of the bar. Moreover, the trimming system can be configured for supination or pronation for powering.

[0021] Optionally, the detent system can comprise n≥2, n∈ detents which are uniformly distributed in the circumferential direction and at least one detent lug which engages radially into the detents, wherein in the release position the at least one detent lug is led past a detent and the detent system is set into the blocking position again behind each led-past detent in front of the next detent. By way of this, a stepwise depowering can be achieved by way of the actuation element being pulled out manually several times and therebetween being automatically retracted into the blocking position in each case. An emergency position can also be provided, concerning which the detent system is not set back into the blocking position, so that the kite can be completely automatically depowered, thus the control lines unwind completely by themselves.

[0022] Likewise according to the invention, a system for trimming a kite is provided, wherein the system comprises a bar and a first pair of lines and a second pair of lines, wherein two lines are provided such that at they are each connected to one end of the kite, wherein the first pair of lines is provided such that it is connected with its first ends to the control lines (back lines) at the tip at the left and at the tip at the right on the kite; the front lines are configured such that they are fastened to the front side of the kite on the left and right and the other ends are connected to a harness; the control lines extend to the left and right at the opposite ends of the bar, wherein the bar comprises opposite ends and an inner cavity, wherein on kiting the bar is firmly held for controlling the kite. The invention is characterised in that the system further comprises the following: a winding rod which via its thread generates an axial movement and effects an orderly, helical winding-up of the back lines onto the winding rod, so that the trim displacement per revolution remains constant; and a winder at the end of the winding rod, so that by way of actuation (rotating) the winder, the back lines are synchronously wound up or unwound in an orderly manner, wherein the winding rod extends from one end of the bar to into the bar where the control lines are wound up or unwound, and wherein the first back line runs from the kite to the first end of the bar through the cavity of the bar or along the bar up to the winding rod and the second back line runs through the second end of the bar into the cavity of the bar to the winding rod.

[0023] Optionally, the system can furthermore comprise a first end-piece which is provided at the first end of the bar and a second end-piece which is provided at the second end of the bar, by which means the back line with one deflection runs through the inner cavity or along the bar up to the winding rod and the back line runs through the second end-piece of the bar into the cavity of the bar up to the winding rod.

[0024] Optionally, the winding rod can be provided such the ends of the control lines are fastened to the winding rod.

[0025] Optionally, the winding rod can be provided with a thread, and this ensures an axial advance for an orderly winding-up and unwinding of the two control lines in the cavity of the bar, said cavity having an inner thread which matches the winding rod.

[0026] Optionally, the winding rod can be connected to a winder and synchronously wind up and unwind the first and the second control line.

[0027] Optionally, the winding rod can be aligned parallel to the bar in the cavity and a winder fastened to its end, said winder winding up or unwinding the back lines by way of rotation.

[0028] Optionally, the winder can compensate the axial advance of the thread of the winding rod by way of a guide in the winding rod and a guide in the winder, said guides matching.

[0029] Optionally, a locking mechanism can be provided on the end-piece, said locking mechanism permitting the winding-up with the winder in steps, but preventing the unwinding by way of a block.

[0030] Optionally, an added plane in the winder can a permit the release of the winding rod from the locking of the end piece in a step-wise manner by way of pulling the winder outwards and by way of this releasing the control lines again for unwinding. Alternatively to this, the winder can be pressed axially into the bar for depowering.

[0031] The present invention is now explained in more detail by way of figures. The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the drawings:

[0033] FIG. 1 is a schematic view showing a kite with front lines, control lines, an embodiment of the bar according to the invention and a harness;

[0034] FIG. 2a and FIG. 2b are schematic views of a first embodiment of the bar according to the invention, once with unwound control lines and once with wound-up control lines;

[0035] FIG. 3a and FIG. 3b are schematic views showing a second embodiment of the bar according to the invention, once with unwound control lines and once with wound-up control lines;

[0036] FIG. 4a and FIG. 4b are schematic views showing a third embodiment of the bar according to the invention, once with unwound control lines and once with wound-up control lines;

[0037] FIG. 5 is a longitudinal sectional view through an embodiment of the trimming system according to the invention;

[0038] FIG. 6 is a perspective view of the winding element, actuation element and detent system of the trimming system according to FIG. 5; and

[0039] FIG. 7 is a cross sectional view through the detent system of the trimming system according to FIGS. 5 and 6.DESCRIPTION OF PREFERRED EMBODIMENTS

[0040] Referring to the drawings, FIG. 1 shows a kite 100 which is fastened to a left control line 1, a left front line 2, a right front line 3 and a right control line 4. The front lines 2, 3 are fastened to a front side of the kite 100 and the control lines 1, 4 to a rear side of the kite, which is why the control lines are also called back lines. The left control line 1 leads onto a left end of a bar 10, with which bar a kite surfer can control the kite 100. The right control line 4 is accordingly led to a right end of the bar 10. The front lines 2 and 3 are led together and through an opening which runs transversely to the longitudinal direction of the bar 10 run transversely through the bar 10 to a harness 22 which the kite surfer carries on his / her hips. As soon as wind engages into the kite 100, the kite 100 via the front lines 2 and 3 pulls on the harness 22 so that a movement of the kite surfer is possible.

[0041] For simplifying the orientation in the drawings, a right-handed Cartesian coordinate system is specified, wherein the z-axis runs in a direct connection line between the bar 10 and the kite 100. The x-axis runs in the longitudinal direction of the bar 10. The y-axis runs in the body longitudinal axis of the kite surfer. The front lines 2, 3 and control lines 1, 4 thus mainly extend in the Z-direction. The movement direction of the kite 100 in the xy plane is controlled by rotating the bar 10 about the y-axis. The desired pressure point of the kite 100 is set by the distance of the bar 10 from the harness 22 in the z-direction, regarding which pressure point the kite 100 assumes a desired angular position about the x-axis and herewith provides a desired engagement surface for the wind.

[0042] The size of the engagement surface of the kite 100 at a certain z-position of the bar 10 can be set by way of trimming the kite 100. The bar 10 comprises a trimming system which is described in more detail hereinafter and concerning which the trimming is effected via a synchronous winding-up and unwinding of the control lines 1, 4.

[0043] FIGS. 2a,b schematically show the bar 10 which extends in the x-direction from a left end-piece 13 to a right end-piece 14. The bar 10 comprises a trimming system, concerning which a winding element 15 which can be actuated from the left or right end of the bar 10 for synchronously winding up and unwinding a respective trim section of the left control line 1 and the right control line 2 is arranged within the bar 10. The figures each show embodiment examples, concerning which the winding element 15 can be actuated from the right end of the bar 10. Alternatively to this, the bar 10 could be configured for a left-handed person such that the winding element 15 can be actuated from the left end of the bar 10.

[0044] The winding element 15 in the shown embodiment examples is a solid or hollow winding rod which extends from one end (here the right end) of the bar 10 into the cavity of the bar 10. The winding element 15 comprises a cylindrical-surface-like first winding surface 15a with a certain winding diameter and a cylindrical-surface-like second winding surface 15b with the same winding diameter. The first winding surface 15a, as is shown in the figures, can form a left winding surface 15a or a right winding surface. Accordingly, the second winding surface 15b can form a right winding surface or a left winding surface. The left control line 1 leads in the z-direction into the left end-piece 13, is led via a first deflection 16a in the x-direction into the cavity of the bar 10 to the winding element 15 and is led to the first winding surface 15a in the z-direction via a second deflection 16b. The end of the left control line 1 is connected to the winding element 15 in a tensionally rigid manner so that on rotation of the winding element 15 about the x-axis the left control line 1 is wound on the first winding surface 15a. The right control line 4 which leads into the right end-piece 14 of the bar 10 is analogously led via deflections 20 to the second winding surface 15b and connected to the winding rod 15 in a tensionally rigid manner, such that the right control line 4 is synchronously wound up on the second winding surface 15b on rotation of the winding element 15 about the x-axis. The winding element comprises a thread 11 which engages into a corresponding counter-thread 21 which is arranged in the bar 10 in a stationary manner. By way of this, the winding element 15 moves axially within the bar 10 on rotation about the x-axis. This in turn has the effect that the left control line 1 and the right control line 4 are wound on the winding element 15 with a constant winding diameter which corresponds to the outer diameter of the first and second winding surfaces 15a,b. Herewith, one prevents the windings of the control lines 1,4 from lying on one another and thus the winding diameter increasing in the course of the winding-up. The trim displacement per revolution of the winding element 15 is accordingly constant over the whole trim displacement.

[0045] The winding element 15 furthermore comprises an actuation axle 15c which extends in the x-direction and to the right out of the right end-piece 14 out of the bar 10. An actuation element 12 in the form of a winder or rotary grip is stuck in the negative x-direction onto a part of the actuation axle 15c which projects out of the bar 10. The actuation element 12 comprises a outer grip surface 12a whose radial distance to the rotation axis x of the winding element 15 is at least as large as the winding diameter of the first and second winding surfaces 15a,b, preferably at least twice as large. By way of this, the winding element 15 can be easily rotated about the x-axis by way of the actuation element 12. For this purpose, the actuation axle 15c of the winding element 15 is coupled to the actuation element 12 in a rotationally fixed manner. In the embodiment which is shown in FIGS. 2a, 2b, for this the actuation axle 15c comprises a groove 18 which extends in the x-direction and into which a corresponding guide element 19 of the actuation element 12 engages. By way of this, the coupling between the actuation axis 15c and the actuation element 12 although being rotationally fixed about the x-axis, is however axially movable in the x-direction. By way of this, the winding element 15 can axially move whilst the actuation element 12 is rotated about the x-axis.

[0046] The trimming system further comprises a detent system 23 which in a blocking position latches in the unwinding direction on rotation of the winding element 15 and prevents a further unwinding of the wound-up trim sections. In a release position of the detent system 23, it does not latch in the unwinding direction on rotation of the winding element 15 and herewith permits an unwinding of the wound-up trim sections. The actuation element 12 is coupled to the detent system 23 such that the axial positioning of the actuation element 12 determines whether the detent system 23 is in the blocking position or in the release position. The actuation element 12 therefore has at least two manually adjustable axial positionings. In the shown embodiments, the actuation element 12 can be pulled out axially, in order to bring the detent system 23 into the release position. If the actuation element 12 is pressed axially to the bar 10 or is automatically pulled / pressed thereto, then the detent system 23 goes into the blocking position.

[0047] The detent system 23 comprises a detent lug 23a which engages into detents (see FIG. 7) which are distributed in the circumferential side. The detent system 23 herewith represents a locking mechanism which permits the winding-up of the control lines 1, 4 and prevents the unwinding by way of a block. The embodiment examples which are shown in FIGS. 3a,b and 4a,b differ from the embodiment example which is shown in FIGS. 2a,b by way of the fixed position of the threaded guide 21 in the bar 10. In the embodiment example which is shown in FIGS. 3a,b, the threaded guide 21 is arranged between the first winding surface 15a and the second winding surface 15b of the winding element 15. Accordingly, the thread 11 is also located on the winding element 15 between the first winding surface 15a and the second winding surface 15b. This has the advantage that the lateral tensile forces which act upon the winding element 15 and with which the control lines 1, 4 engage on the winding element 15 can be easily accommodated by the threaded guide 21. Furthermore, the control line 1,4 which can be controlled with the end of the bar, from which end the winding element 15 can be actuated (here the right control line 4), can be wound up on the winding element 15 without deflections.

[0048] Alternatively to this, as is shown in FIGS. 4a,b, the threaded guide 21 can be arranged to the right of the second winding surface 15b. Analogously to the left control line 1, concerning the embodiment example which is shown in FIGS. 4a,b, the right control line is also led to the second winding surface 15b via two deflections 20 (similarly as in FIGS. 2a,b). This has the advantage that both control lines 1, 4 are led such that the respective friction force for both control lines 1, 4 is roughly the same.

[0049] FIG. 5 shows a longitudinal section in the xz-plane through the trimming system as can preferably be implemented. Here, a right end-piece 14 which projects into the cavity of the bar 10 and there forms a threaded guide 21 in the form of an inner thread is arranged the right end of the bar 10. The winding element 15 here is a solid winding rod which comprises an outer thread 11 which corresponds to the threaded guide 21. The winding element 15 with its inner axial end projects over the threaded guide 21 into the cavity of the bar 10 and there comprises a first control line receiver 25a. The first control line receiver 25a here is a transverse bore through the winding element 15, said bore being chamfered such that the left control line 1 can be led through the control line receiver 25a and an end-thickening, for example a knot, of the left control line 1 is at least partly sunk, but cannot slip through. The first winding surface 15a on which the respective trim section of the left control line 1 is would on the winding element 15 with a winding diameter which is constant over the length of the trim section and which corresponds to the outer diameter of the first winding surface 15a extends axially to the right from the first control line receiver 25a. For winding up the right control line 4, the winding element 15 comprises a second control line receiver 25b. The second control line receiver 25b is a transverse bore through the winding element 15, said bore running parallel to the first control line receiver 25a, wherein the inner thread 11 of the winding rod 15 is arranged axially between the first winding surface 15a and the second control line receiver 25b. Furthermore, the second control line receiver 25b in contrast to the first control line receiver 25a is chamfered on the other side such that the right control line 4 can be threaded through the second control line receiver 25b oppositely to the left control line 1 and an end-thickening, for example a knot of the right control line 4 is partly sunk in the second control line receiver 25b, but cannot slip through. The left control line 1 and the right control line 4 are therefore threaded into the winding element 15 from different sides, so that they are wound on the winding element 15 from opposite sides thereof. The second winding surface 15b, on which the trim section of the right control line 4 is wound on the winding element 15 with a winding diameter which is constant over the length of said trim section and which corresponds to the outer diameter of the second winding surface 15b extends axially to the right from the second control line receiver 25b.

[0050] FIG. 6 perspectively shows the trimming system which is shown in FIG. 5, without the bar 10 and the end-piece 14. In particular, a possible embodiment of the detent system 23 is clarified in FIG. 6. The kite 100 is trimmed to more power by way of the kite surfer by hand embracing the gripping surfaces 12a of the actuation element 12 with the right hand and rotating it to the front by way of supination of the lower arm. Since the thread 11 of the winding element 15 is a right-handed thread, herein the winding element 15 moves axially into the bar 10. FIG. 6 shows the detent system 23 in a blocking position in which the back-rotation in the unwinding direction is prevented. For this, the detent system 23 here comprises three detents 23b which are uniformly distributed in the circumferential direction and a detent lug 23a, wherein the detent lug 23a in the blocking position which is shown in FIG. 6 resiliently yields at each of the detents 23b on rotating the winding element 15 in the winding-up direction and thus permits a winding-up of the wound-up trim sections of the control lines 1,4. The detent lug 23a springs resiliently back behind each yielded detent 23b and by way of this generates an acoustic feedback. By way of this, the trim displacement can be set to precisely one third of the circumference of the winding surfaces 15a,b. In order to bring the detent system 23 out of the blocking position into the release position, the kite surfer can pull the actuation element 12 axially outwards so that in the release position the detent lug 23a is led past a detent 23b. A restoring element 23c forces the detent system 23 back into the blocking position again behind each led-past detent 23b in front of the next detent 23b. If in the release position the winding element 15 rotates in the unwinding direction, then the detent system 23 is automatically set back into the blocking position in order to prevent a further unwinding. By way of this, a stepwise depowering by a defined trim displacement is possible. Here it should be noted that the restoring element 23c is optional and a complete depowering can be desired by way of a complete unwinding in the release position. It can also be advantageous to not provide the restoring element 23c at each detent 23b, so that the depowering can be effected in coarser steps than the powering.

[0051] FIG. 7 shows a cross-sectional view of the trimming system which is shown in the FIGS. 5 and 6. Herein, it is evident that the detent lug 23a engages into the detents 23b in the negative z-direction and a rotation in the unwinding direction is prevented in the blocking position of the detent system 23. The right end-piece 14 of the bar 10 however leaves the detent lug 23a with space in order to resiliently yield to the latches 23b in the positive y-direction when the winding element 15 is rotated in the winding-up direction. In order to simplify this, the detent lug 23a as well as the detents 23b comprises corresponding oblique surfaces which can slide on one another with low friction.

[0052] While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.LIST OF REFERENCE NUMERALS100 kite

[0054] 1 control line left

[0055] 2 front line left

[0056] 3 front line right

[0057] 4 control line right

[0058] 10 bar / steering rod

[0059] 11 threaded winding rod

[0060] 12 actuation element / winder

[0061] 12a grip surfaces

[0062] 13 left end-piece / left end of the bar

[0063] 14 right end-piece / right end of the bar

[0064] 15 winding element / winding rod

[0065] 15a first winding surface

[0066] 15b second winding surface

[0067] 15c actuation axle

[0068] 16a first deflection

[0069] 16b second deflection

[0070] 17 axial blocking position / extra plane winder

[0071] 18 rotationally fixed and axially movable coupling / guide in the winding rod

[0072] 19 rotationally fixed and axially movable coupling / guide in the actuation element / winder

[0073] 20 deflections

[0074] 21 threaded guide / inner thread

[0075] 22 harness

[0076] 23 detent system

[0077] 23a detent lug

[0078] 23b detents

[0079] 23c restoring element

[0080] 25a first control line receiver

[0081] 25b second control line receiver

Claims

1. A bar for kitesurfing, wherein the bar comprises a system for trimming a kite, said kite being connectable to the bar via a left control line which is controllable with a left end of the bar and via a right control line which is controllable with a right end of the bar, wherein the system comprises a winding element, which can be actuated from the left or right end of the bar and is for a synchronous winding-up and unwinding of a respective trim section of the left control line and of the right control line, and is arranged within the bar, wherein the winding element is movably mounted in the bar such that on actuation the winding element rotates within the bar and with this rotation moves axially, so that the respective trim section of the left control line and of the right control line is wound on the winding element with a winding diameter which is constant over a length of the winding element.

2. A bar according to claim 1, wherein the winding element comprises a cylindrical-surface-like first winding surface with the winding diameter and a cylindrical-surface-like second winding surface with the winding diameter, wherein each winding of a wound-up trim section of the left control line lies completely on the first winding surface and each winding of a wound-up trim section of the right control line lies completely on the second winding surface.

3. A bar according to claim 2, wherein the winding element is mounted in a threaded and / or slotted guide, wherein the threaded and / or slotted guide is arranged to the left of the first winding surface or to the right of the second winding surface or axially between the first and second winding surface.

4. A bar according to claim 1, further comprising a manually actuatable actuation element which is arranged at the end of the bar, from which end the winding element can be actuated, wherein the winding element comprises an actuation axle which extends from the actuation element axially into the bar, wherein the actuation axle is coupled to the actuation element in a rotationally fixed and axially movable manner.

5. A bar according to claim 4, wherein the winding element extends along a rotation axis and the actuation element comprises an outer grip surface whose radial distance to the rotation axis of the winding element is at least as large as the winding diameter.

6. A bar according to claim 1, further comprising a detent system which in a blocking position latches on rotation of the winding element in an unwinding direction and prevents a further unwinding of the wound-up trim sections and in a release position does not latch on rotation of the winding element in the unwinding direction and herewith permits an unwinding of the wound-up trim sections.

7. A bar according to claim 6, further comprising a manually actuatable actuation element which is arranged at the end of the bar, from which end the winding element can be actuated, wherein the actuation element is coupled to the detent system so that the axial positioning of the actuation element determines whether the detent system is in the blocking position or release position.

8. A bar according to claim 6, wherein the detent system comprises n≥2 detents which are uniformly distributed in a circumferential direction and at least one detent lug which engages radially into the detents, wherein in the blocking position the at least one detent lug resiliently yields at each of the detents on rotation of the winding element in a winding-up direction which is opposite to the unwinding direction and thus permits the winding-up of the wound trim sections, and wherein the at least one detent lug resiliently springs back behind each yielded detent and by way of this generates an acoustic feedback.

9. A bar according to claim 6, wherein the detent system comprises n≥2 detents which are uniformly distributed in a circumferential direction and at least one detent lug which engages radially into the detents, wherein in the release position the at least one detent lug is led past a detent and the detent system is set into the blocking position again behind each led-past detent in front of the next detent.

10. A bar according to claim 1, wherein the trim sections of the left control line and of the right control line are wound upon the winding element from opposite sides thereof.

11. A system for trimming a kite wherein the system comprises:a bar;a first pair of lines and a second pair of lines wherein, two lines are provided such that respective lines are each connected to one end of the kite, wherein the first pair of lines is provided such that the first pair is connected with first ends to control lines as back lines onto a tip at the left and onto a tip at the right, on the kite; the second pair of lines, as front lines, are configured such that the front lines are fastened to the front side of the kite on the left and right and other ends of are connected to a harness; the control lines extend to the left and right at the opposite ends of the bar, wherein the bar comprises opposite ends and an inner cavity, wherein on kiting the bar is firmly held for controlling the kite;a winding rod which via winding rod thread generates an axial movement and effects a controlled, helical winding-up of the back lines onto the winding rod, so that a trim displacement per revolution remains constant; anda winder at the end of the winding rod, so that by way of an actuation by rotating of the winder, the first pair of lines are synchronously wound up or unwound in a controlled manner,wherein the winding rod extends from one end of the bar to into the bar where the first pair of lines are wound up or unwound, andwherein the first back line runs from the kite to a first end of the bar through the cavity of the bar or along the bar up to the winding rod and the second back line runs through a second end of the bar into the cavity of the bar to the winding rod.

12. A system for trimming a kite according to claim 11, wherein the system further comprises a first end-piece which is provided at the first end of the bar and a second end-piece which is provided at the second end of the bar, by which means the first back line with one deflection runs through the inner cavity or along the bar up to the winding rod and the second back line runs through the second end-piece of the bar into the cavity of the bar up to the winding rod.

13. A system for trimming a kite according to claim 11, wherein the winding rod is provided such the ends of the control lines and are fastened to the winding rod.

14. A system for trimming a kite according to claim 11, wherein the winding rod is provided with a thread configured to ensure an axial advance for an orderly winding-up and unwinding of the two control lines in the cavity of the bar, said cavity having an inner thread which matches the winding rod.

15. A system for trimming a kite according to claim 11, wherein the winding rod is connected to the winder and synchronously winds up and unwinds the first and the second control line16. A system for trimming a kite according to claim 11, wherein the winding rod is aligned parallel to the bar in the cavity and the winder is fastened to winding rod end, said winder winding up or unwinding the back lines by way of rotation.

17. A system for trimming a kite according to claim 16, wherein the winder compensates the axial advance of the thread of the winding rod by way of a guide in the winding rod and a matching guide in the winder.

18. A system for trimming a kite according to claim 17, wherein a locking mechanism is provided on the end-piece (14), said locking mechanism permitting the winding-up with the winder in stages, but preventing the unwinding by way of a block.

19. A system for trimming a kite according to claim 18, wherein an added plane portion in the winder permits a release of the winding rod from locking of the end piece in a step-wise manner by way of pulling the winder outwards, and by way of this the release of control lines again for unwinding.

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