FI68194B - FOER SURFINGBRAEDE AVSEDD KOEL - Google Patents

Description

681 94 Wedge for windsurfing

The invention relates to a keel for a windsurf board comprising a multi-part blade part articulated to the board, which can be pivoted into a position inside or against the board and lowered into positions projecting from the board.

Sailboats use keel for the same reason as sailboats, i.e. to prevent excessive lateral squeezing when sailing in a headwind or when sailing completely in crosswinds.

In order to be able to sail in high winds on a windsurf board, the keel must be small or it must be possible to lift or turn it so that the water level decreases. In strong winds, it must be possible to lift it completely off or turn it in completely inside the 15 windsurfers. If the keel is too large in high winds, the lateral force caused by the sail on the board will tip the board.

For these reasons, many windsurf manufacturers have opted for a small keel for "high wind" windsurfers, the 20 water surfaces of which can be adjusted by turning the keel inside the board. Since the thickness of the windsurf is only 10 ... 15 cm, it sets the limit to the size of the keel (the keel is deep and narrow). Due to the small keel, these windsurfers can only be sailed properly in crosswinds and downwinds, as the lateral deflection is very large when created.

In particular, it comes out harmful in moderate and quiet winds, with the majority of enthusiasts windsurfing.

Attempts have been made to solve the problems described above by means of adjustable pins with a pin-30, such as are known, for example, from DE patent publication 25,593 and DE application publications 2,824,804 and 2,938,194. From the first two publications, both fan-opening and bellows-like keel are known. In these structures, the positioning of the keel surface 35 during windsurfing by means of the legs is practically impossible. Thus, the most advantageous keel size should be able to estimate in advance 2 681 94, which is quite difficult. In addition, the shape of these keel is not flow-optimally optimal.

DE-A-2,938,194, on the other hand, discloses a keel consisting of a plurality of successively articulated sub-members 5 which can be turned to different angular positions with respect to each other. Although the shape and position of such a keel can also be changed quite extensively during windsurfing, for example by means of legs, it does not offer sufficient possibilities for changing the surface area of the keel.

It is therefore an object of the present invention to provide a keel which has advantageous flow resistance properties, can also be adjusted during windsurfing, e.g. by means of legs, and with which a sufficient surface setting range is achieved.

The above object is solved by a keel according to the invention, characterized in that the blade part consists of nested keel-shaped shells which can slide relative to each other to change the surface area of the keel.

In the following, the keel of the windsurf according to the invention will be described in more detail with reference to the accompanying drawings, in which Fig. 1 shows the windsurf from the side, Fig. 2 shows the keel according to the invention turned inside the board, Fig. 3 shows the keel according to the invention in a projecting position, Fig. 4 3 along the line IV-IV, Fig. 5 shows a section along the line VV of Fig. 7, Fig. 6 shows the keel of Fig. 3 in the spread position and Fig. 7 shows the keel of Fig. 6 in a cross-section.

Figure 1 shows a windsurf board 1 with a board articulated keel 2, which includes a lever-like part 6 extending through the board, by means of which the position of the keel can be changed.

3 68194

Figure 2 shows the keel 2 according to the invention in more detail. In the embodiment of Figure 2, the keel is a fully sinking pattern inside the board 1 and articulated with respect to point 10, but it can also be either only 5 partially sinking patterns or only a pattern against the lower surface of the board. As shown in Figure 2, the keel according to the invention can be fitted to existing boards with so-called as a keel package, in which case an opening is first sawn into the board, into which the keel structure with its surrounding board parts is fitted, e.g. by gluing.

Figure 3 shows the keel 2 in its position projecting from the board. The wedges can be adjusted to different inclination positions by means of a lever 6 and a conventional friction member 9 placed on the wedges. On opposite sides of the lever 6, levers 7 and 8 are arranged, with which the relative position of the parts of the keel can be changed in order to achieve the desired surface area.

Figure 4 shows the most preferred structure of the keel 2. It consists of nested shells 3, 4, 5, from which parts 4 and 5 can be pulled out to adjust the surface area 20 of the keel as shown in Figures 5 to 7 by means of levers 7 and 8.

Figure 6 shows the shape of the keel when applied. It is preferred that the levers 7 and 8 are dimensioned so that they press against the surface of the board 1 before the blade parts 4 and 5 hit the board and retract the blade parts, e.g. when landing or the keel hits e.g. the rock and swings to an oblique position. It should be mentioned that the keel includes a conventional friction member (shown only in Fig. 3), by means of which the keel can also be adjusted to oblique positions, as shown in Fig. 6 by the broken line.

Figure 7 shows in more detail the embodiment of the invention according to Figures 2 to 6. According to Fig. 7, the blade part 4 is arranged to slide inside the blade part 3 along the slide rails 11 and the blade part 5, respectively, with respect to the blade part 4 35 along the rails 12. Parts 4 and 5 are moved to the lever 6 and parts 4 and 5 by means of articulated corner levers 7 and 8.

4 68194

The invention has been described above on the basis of only one perhaps most preferred embodiment, and it is to be understood that the structure can be substantially altered within the scope of the appended claims. Thus, for example, the levers 5 7 and 8 can be replaced either by a wedge-like member extending through the board or, for example, by a pump for generating a liquid pressure, in which case a bladder-like bulging member is arranged inside the blade part 3. For example, a spring can be used to return parts 4 and 5.

Claims (5)

68194 A keel for a windsurf board comprising a multi-piece blade part (2) articulated to the board (1), which is pivotable to a position inside or against the board (1) and can be lowered into positions projecting from the board, characterized in that the blade part (2) ) consists of nested keel-shaped shells (3, 4, 5) that can slide relative to each other to change the surface area of the keel. Wedge according to Claim 1, characterized in that each part (3, 4, 5) of the blade part (2) is associated with a lever (6, 7, 8) extending on the cover of the board (1), by means of which it can be moved to the desired position. Wedge according to Claim 2, characterized in that the levers (7, 8) are dimensioned in such a way that, when the keel collides with, for example, a rock and tilts backwards against the cover of the board (1) and retracts the blade sections before they hit the board (1). A keel according to claim 1, characterized in that a wedge-shaped member is connected to the board (1) by pressing which the keel is opened. Wedge according to Claim 1, characterized in that a foot-operated pump element is connected to the board (1), the pressure generated by which opens the keel and that return springs are arranged between the blade parts (3, 4, 5).