JP2006082607A - Turbulence suppressing attachment generated in fin of surfboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress turbulence of a water flow at a fin by providing a water flow turbulence suppressing attachment on the fin of a surfboard. <P>SOLUTION: An exterior wall 13 for suppressing turbulence suppresses the turbulence in an attachment in which a surfboard tightly fitting part 11 and a fin fitting groove 12 are mounted on an upper end of a front portion of a fin F of a surfboard S. In the front view of the shape of the exterior wall 13, both upper ends are coupled with the surfboard tightly fitting part 11 at an acute angle or an angle close to an acute angle. The exterior wall 13 is thick-walled, and descended inwardly in a curved manner, and coupled with a lower end in a streamline manner. In the plan view, both side surfaces are thick-walled in a streamline shape from a tip part of an attachment body 10, and both rear ends are coupled with right and left inner walls 12a and 12b at an acute angle or an angle close to an acute angle. In the side view, the upper end of the front portion is coupled at an acute angle or an angle close to an acute angle from a front portion of the surfboard tightly fitting part, extends to a rear lower end so as to depict an inner circle, and extends from the lower end to a rear upper end so as to depict an outer circle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

      The present invention relates generally to surfboards, and more particularly to fins attached thereto. In particular, the present invention relates to an accessory that suppresses the turbulent flow of water generated in the fin.

    The surfboard is a playground equipment for riding waves, and the usage is to find a sea urchin from the sea off the sea and lie on the surfboard in the stomach, accelerate with your arms and get up when you are pushed by the sea urchin Glide along the direction of collapse. Occasionally, use the slope created by the wave undulation to move it up and down. Its shape varies and varies depending on the size and shape of the wave, or how the vertical motion is made (large movement, small movement) relative to the slope of the sea urchin. But all surfboards have fins for stability, acceleration and control. The fin is shaped like a fin of a fish, and is attached to the rear of the portion of the plate-shaped surfboard that contacts the sea surface.

    The number of fins varies, with one in the middle and three in addition to the left and right mainstream, but only two on the left and right, and five in addition to the three on the left and right is there. The purpose of attaching the fins is stability and control during the slope run. And you can enjoy changing the size and shape of the fins according to the shape of the surfboard and how you enjoy the waves.

    Previously, fins were attached to surfboards by roving (resembling the shape of a putty, reproducing the roots of fish fins), but recently, detachable ones have become mainstream. The reason for this is to use different fins for convenient surfing when traveling, etc., for surfing that suits you. However, with the current system, a corner is created in the bonding surface between the fin and the board by design, a swirl occurs in that part, a smooth water flow, a force that prevents movement, and during acceleration and turn control Causes stall, blurring, and skidding. In addition, if roving is applied to the removable fin, there is a problem in terms of cost. Currently there are no roving detachable fins.

    Therefore, the point that we focused on this time is to eliminate the negative factors caused by the surfboard and fins being mounted in an unnatural form and to maximize the characteristics of the original surfboard and fins. What I came up with was to attach it to the current detachable fin using the attachment method. By attaching this attachment, we are paying attention to whether it is possible to eliminate the elements that hinder water and maximize the speed and make it easier to control.

    Most surfers currently want to use a roving fin-on system (installed), but they are often used in situations where the surfboard is carried or replaced with a fin that matches the wave. So use a removable system (removable).

    As described above, a fin for controlling the direction of travel of the surfboard for enjoying surfing on the coast is mounted on the bottom of the rear part of the surfboard. The shape, size, and number of fins are selected in consideration of the surfer's preference and the viewpoint of sports science.

By the way, the fins of the surfboard are produced using a minimum area of a single flat plate from the viewpoint of simplicity of the manufacturing process and manufacturing cost.
Surf Style 2001 Co., Ltd.

    Therefore, when the object such as the surfboard S advances after the water is cut off, not only the direct resistance of water but also turbulent flow such as vortex flow is generated in various places, and the vortex force of pulling back the object against its traveling direction works. Furthermore, vortexes are generated in the horizontal direction, and the smooth operation of the surfboard is hindered to give instability (see A and B in FIG. 1). In order to prevent this, it is necessary to produce fins having a shape that does not generate turbulence. However, it is difficult to process the fins in that way from the beginning, as mentioned above, to simplify the production or to reduce the cost. Therefore, a technique has been devised in which a conventional fin is used as it is and an attachment having a shape that suppresses the turbulent flow is attached to a location where the turbulent flow such as the vortex of the fin is generated (A in FIG. 2). See B).

    In order to solve the above problems, the turbulent flow suppression attachment generated in the fin of the surfboard according to the present invention is equipped with an attachment having a shape along the natural flow of the water flow so as to suppress the turbulent flow of the water flow. To do.

  Below, the concrete structure of the turbulent flow suppression attachment produced in the fin of the surfboard concerning this invention is described in detail. First, the configuration of the invention described in claim 1 of the present invention will be described. The present invention first has an attachment body. Next, there is a surfboard adhesion part. The surfboard contact portion has a shape in which the upper end of the attachment main body is in close contact with the bottom surface of the fin mounting portion of the surfboard. And there is a fin fitting groove. The fin fitting groove is provided inside the attachment main body, and the inner wall is closely fitted to the upper front portion of the fin.

    Finally, there is an outer wall for turbulent flow suppression. The outer wall of the turbulent flow suppression has a shape in which the shape of the outer surface of the attachment main body is represented by a front view with the advancing direction as the front, and both ends of the upper end thereof are acutely or acutely angled to the surfboard contact portion. They are connected at a close angle to form a thick shape, and both are curved downward toward the inside and connected in a streamline shape at the lower end.

    And the shape represented by the plan view with the traveling direction in front is a streamlined thick shape on both sides from the tip, and both rear ends are acute or acute at the rear end of the inner wall. Combined at close angles.

    Furthermore, the shape shown in the right side view with the traveling direction as the front is coupled with the upper end of the front portion forming an acute angle or an angle close to the acute angle from the front portion of the surfboard contact portion. It extends from the lower end to the rear upper end so as to draw an inner circle, and extends from the lower end to the rear upper end, and the shape shown in the left side view is the inverted shape of the right side view belongs to.

    Next, the structure of the invention described in claim 2 of the turbulent flow suppression attachment generated in the fin of the surfboard according to the present invention will be described. The present invention first has an attachment body. Next, there is a surfboard adhesion part. The surfboard contact portion has a shape in which the upper end of the attachment main body is in close contact with the bottom surface of the fin mounting portion of the surfboard. And there is a fin fitting groove. The fin fitting groove is provided inside the attachment main body, and its inner wall is closely fitted to the upper front portion of the fin.

    Finally, there is an outer wall for turbulent flow suppression. The outer wall of the turbulent flow restraint has the shape of one of the left and right side surfaces represented by the front view in which the shape of the outer surface of the attachment main body is the front of the direction of travel. It forms an acute angle or an angle close to an acute angle, forms a thick shape, descends while drawing a curve toward the inside, and is connected to the other side surface in a streamline shape at its lower end. On the other hand, the shape of the other side of the left and right sides of the surfboard is joined to the surfboard contact part with an acute angle or an angle close to the acute angle, and a thin shape is formed and a curve is drawn toward the inside to descend. At its lower end, it is connected to the other side surface in a streamline shape.

    And the shape of one of the left and right side surfaces represented in a plan view with the traveling direction as the front surface, the side surface has a streamlined thick shape from the front end, and the rear end is the rear end of the inner wall. Are combined at an acute angle or an angle close to the acute angle. On the other hand, the shape of the other side surface of the left and right side surfaces is combined with a streamlined thin shape from the front end portion, and the rear end thereof forming an acute angle or an angle close to the acute angle with the rear end of the inner wall. .

    Furthermore, the shape represented by the side view with the traveling direction as the front is coupled with the front upper end portion forming an acute angle or an angle close to the acute angle from the front portion of the surfboard contact portion, and below It extends to the rear lower end to draw an inner circle. And the shape of one side surface of the left and right side surfaces extends so as to draw a long outer circle from the lower end to the rear upper end. And the shape of the other side surface of the left and right side surfaces extends so as to draw a short outer circle from the lower end toward the rear upper end.

  The turbulent flow suppression attachment generated in the fins of the surfboard according to the present invention has been made as described above. Therefore, the above problems have been solved and the following great effects have been produced. That is, by providing a turbulent flow suppression attachment to the fin of the surfboard, the turbulent flow of the fin can be suppressed.

    In order to suppress the turbulent flow generated in the fins of the surfboard, a technique has been devised in which an attachment having a shape that suppresses the turbulent flow is attached to a location where the turbulent flow such as the vortex of the conventional fin is generated.

    Hereinafter, a turbulent flow suppression attachment generated in a fin of a surfboard according to the present invention will be described in detail with reference to the accompanying drawings by using a specific embodiment thereof. First, a first embodiment which is an embodiment of claim 1 will be described. First, there is a symmetrical attachment main body 10. As shown in FIG. 3, the attachment body 10 is attached to the upper end of the front portion of the fin F of the surfboard S. The attachment main body 10 according to the embodiment of the first aspect is for mounting on the fin F at the center of the surfboard S.

    The attachment body 10 has a surfboard contact portion 11. The surfboard contact portion 11 has a shape in which the upper end of the attachment body 10 is in close contact with the bottom surface of the fin mounting portion of the surfboard S. And there is a fin fitting groove 12. The fin fitting groove 12 is provided in the attachment main body 10. The right inner wall 12a and the left inner wall 12b are tightly fitted to the upper part of the front portion of the fin F. Therefore, in the present embodiment, the shapes of the left and right inner walls 12a and 12b of the fin fitting groove 12 are symmetrical.

    Finally, there is an outer wall 13 for turbulent flow suppression. The shape of the outer wall 13 for suppressing the turbulent flow will be described below with an easy-to-understand front view, plan view, and left and right side views with the traveling direction as the front. Therefore, in the present embodiment, the shapes of the right outer wall 13a and the left outer wall 13b of the outer wall 13 are bilaterally symmetric.

    First, it is the shape represented by the front view (FIG. 4) of the shape of the outer side surface of the attachment main body 10, which is an acute angle or an angle close to the acute angle at both ends of the upper end of the surfboard contact portion 11. Both the outer walls 13 have a thick shape and are curved downward toward the inside, and are joined in a streamline shape at the lower end.

    And it is the shape represented by the plan view (FIG. 5) (see also the bottom view of FIG. 6) (these are drawn 45 degrees to the right for convenience of the drawing area), Both sides of the attachment body 10 have a streamlined thick shape, and both rear ends thereof are connected to the rear ends of the left and right inner walls 12a and 12b at an acute angle or an angle close to an acute angle. Yes.

    Further, the shape shown in the right side view (FIG. 7) with the traveling direction as the front is such that the front upper end portion forms an acute angle or an angle close to the acute angle from the front portion of the surfboard contact portion 11. It extends to the rear lower end so as to draw an inner circle below it and extends from the lower end to the rear upper end so as to draw an outer circle.

    Finally, the shape shown in the left side view is that of the right side view (see also FIGS. 8 and 9). As shown in FIG. 1, the attachment body 10 can be extended to an arbitrary length as shown by a wavy line 10a in FIG. 1 with a gentle curve from the lower end to the rear.

    Next, the configuration of the embodiment of the invention described in claim 2 of the turbulent flow suppression attachment generated in the fin of the surfboard according to the present invention, embodiment 2 will be described. The present invention first has a left-right asymmetric attachment body 20 (FIG. 10). The attachment main body 20 according to the embodiment of the second aspect is for mounting on the fins F on the left and right side surfaces of the surfboard S. 10 to 16, the left fins are drawn, but in the case of the right fins, it is only necessary to make these figures symmetrical. Needless to say.

    The attachment body 20 has a surfboard contact portion 21. The surfboard contact portion 21 has a shape in which the upper end of the attachment body 20 is in close contact with the bottom surface of the fin mounting portion of the surfboard S. There is a fin fitting groove 22. The fin fitting groove 22 is provided in the attachment main body 20, and the right inner wall 22a and the left inner wall 22b are closely fitted to the upper portion of the front portion of the fin F. Therefore, in this embodiment, the shapes of the left and right inner walls 22a and 22b of the fin fitting groove 12 are asymmetrical.

    Finally, there is an outer wall 23 for turbulent flow suppression. The shape of the outer wall 23 for suppressing turbulent flow will be described below with an easy-to-understand front view, plan view, and left and right side views. Therefore, in the second embodiment, the shapes of the right outer wall 23a and the left outer wall 23b of the outer wall 23 are asymmetrical. The outer wall 23 for preventing turbulent flow has the shape of one of the left and right side surfaces shown in the front view (FIG. 10) in which the shape of the outer side surface of the attachment body 20 is the front in the traveling direction. Is connected to the surfboard contact portion 21 at an acute angle or an angle close to an acute angle, and is formed into a thick shape, descends while drawing a curve toward the inside thereof, and forms a streamlined shape at the lower end on the other side surface. Are connected. On the other hand, the shape of the other side of the left and right sides of the surfboard is joined to the surfboard contact part with an acute angle or an angle close to the acute angle, and a thin shape is formed and a curve is drawn toward the inside to descend. At its lower end, it is connected to the other side surface in a streamline shape.

    And the plan view (FIG. 11) (refer also to the bottom view of FIG. 12) with the traveling direction as the front (they are drawn to the right and rotated to the right by 45 degrees for the convenience of the drawing area) The shape of one of the side surfaces is such that the side surface forms a streamlined thick shape from the distal end of the attachment body 20, and the rear end has an acute angle or an angle close to the acute angle to the rear end of the left inner wall 22a. It is combined. On the other hand, the shape of the other side surface of the left and right side surfaces is a streamlined thin shape from the distal end portion of the attachment body 20, and the rear end thereof has an acute angle or an angle close to the acute angle to the rear end of the right inner wall 12b. It is combined.

    Further, the shape shown in the right side view (FIG. 13) and the left side view (FIG. 14) with the traveling direction as the front is such that the front upper end is an acute angle from the front part of the surfboard contact part 21 or It joins at an angle close to an acute angle and extends to the lower rear end so as to draw an inner circle below it. And the shape of one side surface of the left and right side surfaces extends so as to draw a long outer circle from the lower end to the rear upper end. And the shape of the other side surface of the left and right side surfaces extends so as to draw a short outer circle from the lower end to the rear upper end (see also FIGS. 15 and 16). As in the attachment main body 10 of the embodiment, the attachment main body 20 also has an arbitrary length as shown by the wavy line 10a in FIG. It can also be extended longer.

    In addition to one or three surfboard fins, it can be applied to two or five fins. Furthermore, it can respond to fins of various shapes.

It is explanatory drawing of the turbulent flow which arises in the fin of a normal surfboard, Comprising: The A shows the right view, The B shows the front view. FIG. 1 is an explanatory diagram of a turbulent flow suppression effect generated in a fin of an embodiment in which a turbulent flow suppression attachment generated in the fin of the surfboard according to the present invention is provided, and A is a right side view thereof, B shows the front view. It is a right view of the Example which provided the turbulent flow suppression attachment produced in the fin of the surfboard concerning this invention in the fin. The front view of one Example of the turbulent flow suppression attachment produced in the fin of the surfboard concerning this invention is shown. FIG. 5 is a plan view of the thing of FIG. 4. It is a bottom view of the thing of FIG. FIG. 5 is a right side view of the thing of FIG. 4. FIG. 6 is a cross-sectional view taken along line AA of FIG. 5. FIG. 6 is a sectional view taken along line B-B of FIG. 5. The top view of another Example of the turbulent flow suppression attachment produced in the fin of the surfboard concerning this invention is shown. FIG. 11 is a bottom view of FIG. 10. It is a front view of the thing of FIG. FIG. 11 is a right side view of FIG. 10. It is a left view of the thing of FIG. FIG. 11 is a cross-sectional view taken along line AA of FIG. 10. FIG. 11 is a sectional view taken along line BB of FIG. 10.

Explanation of symbols

10, 20 Attachment body 11, 21 Surfboard contact part 12, 22 Fin fitting groove
12a, 22a right inner wall
12b, 22b Left inner wall 13, 23 Outer wall
13a / 23a Right outer wall
13b, 23b Left outer wall F Fin S Surfboard

Claims (2)

    An attachment body, a surfboard contact portion having a shape in which the upper end of the attachment body is in close contact with the bottom surface of the fin mounting portion of the surfboard, and is provided inside the attachment body, and an inner wall of the front portion of the fin has an inner wall The fin fitting groove for tight fitting, the shape of the outer surface of the attachment main body shown in the front view with the traveling direction as the front, the both ends of the upper end at an acute angle or an acute angle at the surfboard close contact portion The shape is shown in a plan view with a close angle and joined to form a thick wall shape, both curved down toward the inside, joined in a streamline shape at the lower end, and the direction of travel in front However, both side surfaces of the tip end form a streamlined thick shape, and both rear ends thereof are connected to the rear end of the inner wall at an acute angle or an angle close to the acute angle, and the traveling direction is further determined. The shape shown in the right side view as a plane is such that the upper end of the front part is joined at an acute angle or an angle close to the acute angle from the front part of the surfboard contact part, and an inner circle is drawn below it The outer wall of the turbulent flow suppression that extends to the lower end of the rear and extends from the lower end to the upper end of the rear and that is depicted in the left side view is the inverted shape of the right side view. A turbulent flow suppression attachment that occurs on the surfboard fins.   An attachment body, a surfboard contact portion having a shape in which the upper end of the attachment body is in close contact with the bottom surface of the fin mounting portion of the surfboard, and is provided inside the attachment body, and an inner wall of the front portion of the fin has an inner wall The fin fitting groove for tight fitting, the shape of the outer surface of the attachment main body shown in the front view with the traveling direction as the front, the shape of one of the left and right side faces the upper end of the surfboard contact portion Connected to the other side of the streamlined shape at the lower end, and connected to the other side of the left and right sides of the other side The upper end of the shape is connected to the above-mentioned surfboard contact portion with an acute angle or an angle close to the acute angle to form a thin shape. The shape of one side of the left and right side surfaces, which is connected to the other side surface in a streamline shape at the lower end and represented in the plan view with the traveling direction as the front surface, has a streamlined thick shape from the tip portion to the side surface. The rear end forms an acute angle or near an acute angle with the rear end of the inner wall, and the other side surface of the left and right side surfaces has a streamlined thin shape from the front end portion, and the rear end has the above-mentioned shape. The shape shown by the side view which made the acute angle or the angle close | similar to an acute angle at the rear end of the inner wall of this inner wall, and the front direction was the front direction is the acute angle from the front part of said surfboard contact part. Or it is connected at an angle close to an acute angle and extends to the lower end of the rear so as to draw an inner circle below it, and the shape of one of the left and right side surfaces is long outside from the lower end toward the upper end of the rear. It stretches like drawing a circle and its left and right sides The other shapes of the side outer wall of the turbulence suppression extending so as to draw a short outer circle toward the rear of the upper end from the lower end, turbulence suppression attachment occurring surfboard fins characterized in that it is more configurations.

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