JP2007118691A - Fin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fin capable of eliminating a roving process, for example, in fin mounting work of a surf board, extremely simplified and facilitated at low cost, capable of providing high strength of the mounted fin, high in its mounting strength and capable of eliminating unnecessary resistance of water by smoothing a flow of the water by the fin when it is in use. <P>SOLUTION: This fin 1 for the surf board made of a fin base part and a fin body has the fin base part 10 constituted in a thick shape and gradually thinner toward a fin head end and a bottom surface part 12 made of a flat surface in correspondence with the thick part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fin structure of a surfboard.

Conventionally, as for surfboards, a fixed fin type and a detachable fin type have been used.
In other words, most of the surfboard manufacturing processes are basically the shape process, the glassing process, the hot coat process, the process of attaching the fin box and attaching the fins, the process of attaching the fins, the sanding process, the glossing process, the sanding process, the polishing process. It is manufactured through a process.
In this case, in order to facilitate the attachment of the fin, when the fin box is used as described above, the fin box is attached and the fin is screwed thereon.

With regard to such a structure, the fin is firmly fixed by screwing or the like.
Furthermore, in order to fix the fin to the board more, there is one that increases the strength by fixing the string-like glass fibers around the fin and hardening with a resin.
In addition, a fin is attached by fixing a fin-like glass fiber around a fin in advance at a predetermined position without using a fin box and solidifying with a resin.
In addition to these, there are various methods for attaching fins detachably using a fin box.

That is, as a structure in which the fins are detachably fixed by being fitted into the locking member, Japanese Patent Laid-Open No. 2003-528003 (Patent Document 1), Japanese Patent Application Laid-Open No. 2005-74026 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2005-112206 (Patent Document). Reference 3) exists.
In addition, as a structure in which the fin is detachably attached by a special locking member, there are JP 2005-508798 (Patent Document 4) and JP 2005-526664 (Patent Document 5).
Furthermore, although it is screwed, the structure for detachably holding the fins is disclosed in Japanese Patent Laid-Open No. 6-255575 (Patent Document 6), Special Table 2001-520961 (Patent Document 7) and Special Table 2002-530242 (Patent Document 8). Exists.
Special table 2003-528003 JP-A-2005-74026 JP-A-2005-112206 Special table 2005-508798 Special table 2005-526664 JP-A-6-255575 Special table 2001-520961 Special table 2002-530242

As described above, there are various types of fins that can be attached to surfboards, bodyboards, etc., especially those that are tightly attached to ensure attachment reliability, while the protruding part of the fin part is carried and operated There are things that can be removed because it interferes with the process.
In these cases, fins to which a fin box is first attached and screwed in the various processes are often used from the viewpoint of workability, but workability is generally reduced because it takes time to embed the box. It is difficult to say that it is expensive, and the cost is high.
Furthermore, a force is applied to the screw portion and there is a risk of breakage at the screw-fastened portion. To prevent this, roving and fixing with resin will take too much work.

In addition, the fins are attached by fixing the fins by placing the glass fiber glass around the fins in advance at a fixed position without using the fin box, and fixing the fins by so-called roving. It is necessary to attach the base to the bottom and then laminate or roving with a glass cloth around it, which inevitably weakens the mounting strength and requires time and effort. In the first place, the fin box is used to eliminate this problem. Is used.
In addition, there is a fin that has a screw-fastening part at any location such as the base of the fin without using the fin box and is screwed to the board, but this requires a screw-fastening process and the screw-fastening part The screw head portion or the hole for this purpose is exposed to the outside as it is, and has the disadvantages of water resistance and contact with the sole of the foot.

Therefore, it is inevitably desired to perform a roving or glass cloth laminating process exactly and neatly.
Furthermore, fin boxes are inevitably disposed in the fins related to JP-T-2003-528003 (Patent Document 1), JP-A-2005-74026 (Patent Document 2), and JP-A-2005-112206 (Patent Document 3). This is necessary and time-consuming, and further increases the cost.
Moreover, while it is easy to attach and detach, it cannot be said that the fins are not inadvertently removed, and some solution is desired.

Furthermore, regarding the special table 2005-508798 (patent document 4) and the special table 2005-526664 (patent document 5), it is necessary to dispose the fin box in the same manner, and it takes time and cost. It will become.
These are particularly complicated in structure and increase in weight accordingly, and some solution is desired in a balanced manner.
Japanese Patent Laid-Open No. 6-255575 (Patent Document 6), Special Table 2001-520961 (Patent Document 7) and Special Table 2002-530242 (Patent Document 8) can be screwed tightly. It is necessary to dispose a fin box in the same manner as described above, and it takes time and effort, and further increases the cost.

As described above, these configurations are time-consuming and costly, and further, a force is applied to the connecting portion between the fin and the board, so that further strengthening is desired in terms of strength. It is rare.
Furthermore, the fins described above are basically flat fins, and the base portions of the fin body and the connecting portion have substantially the same thickness. For further strengthening, it is necessary to increase the thickness from a flat plate shape by laminating or roving a glass cloth, and it takes too much time, time or cost to do this.
Further, in the state where the flat fins are attached as they are, the flow of water does not flow smoothly, and water resistance is received on the side surfaces of the fins.
In particular, in the configuration having the fin box together, the water resistance is further received.

Therefore, in order to eliminate the resistance of these waters and improve the flow of water, it is desired to configure the base portion of the fin in an arc shape so as to be a so-called water droplet type. It is extremely time consuming to form a glass by laminating or roving glass cloth.
Furthermore, if the fins are attached by laminating and then sanded to adjust the shape, the fins will inevitably be scraped off and the fin mounting strength will decrease. In particular, the rovings arranged around the fins are fins. Since the fibers are arranged and laminated in a direction parallel to the attachment direction, the fins are likely to wobble in both directions with the attachment base as a fulcrum.
Therefore, the fin mounting workability is easy, the cost can be reduced and the strength of the fin can be increased, and the strength of the mounting is also high. There is a demand for fins that can smoothly flow and eliminate unnecessary water resistance.

  In order to solve the above problems, an invention relating to the structure of a fin of a surfboard is provided. First, the invention of claim 1 is a fin used in a surfboard, the fin comprising a fin base and a fin body, The base is formed of a thick shape and is gradually thinned toward the tip of the fin and has a fin having a bottom surface composed of a flat surface corresponding to the thick portion, and the invention can solve the problem.

Further, the invention described in claim 2 is a fin used for a surfboard, the fin comprising a fin base and a flat fin body, and a fin having a flange that is flush with the bottom surface of the fin base. Even if it is invention, this subject can be solved similarly.
Further, the invention described in claim 3 is composed of a fin having a flat bottom surface portion that matches the bottom surface of the surfboard, and the invention according to claim 4 has a fin base portion substantially extending from the front direction toward the rear direction. The fin according to the present invention is a fin having a water droplet shape, and the invention according to claim 5 is a fin in which the fin main body is inclined with respect to the plane of the bottom surface of the fin base. This problem can be solved in the same way.

According to the first aspect of the present invention, the fin can be bonded to the board without using the fin box, and the operation can be easily performed.
Therefore, the workability can be improved and the manufacturing cost can be reduced.
Furthermore, since the base is integrally formed with a thick wall, high strength can be exhibited.
At the same time, the bottom part of the thick base is in contact with the bottom surface in a wide area to increase the bonding strength, and it is possible to laminate the glass cloth in a wide range of the thick base and increase its bonding strength. it can.
In particular, roving is not necessary, and the labor of the roving work for this can be eliminated, and the labor of the molding work by the sanding work at that portion can be omitted even in the work process.
In addition, since the angle of the fin main body can be arbitrarily taken because of the integral molding, it is possible to provide a fin having an arbitrary angle in advance for the fins and the like disposed on the side.

Next, according to the second aspect of the present invention, a wide bottom surface portion can be obtained in the same manner, so that the same effect as in the first aspect can be exhibited, and the adhesive strength can be increased between the flange portion and the bottom surface.
Furthermore, as described above, the roving work can be omitted.
Next, according to the third aspect of the present invention, since the contact surface with the bottom surface coincides, the fin can be securely placed on the bottom surface, the workability can be improved, and the adhesion can be further strengthened. It will be.
According to the fourth aspect of the present invention, it is possible to reduce the water resistance when the water is cut by the fins at the stage of riding on the waves, and to improve the straightness and stability.
Furthermore, according to the invention described in claim 5, it is possible to easily bond the fin in an inclined state to the bottom portion in advance. For example, a bottom surface portion that uses a plane that matches the bottom portion in a side fin or the like as the bottom surface portion. The fin itself having a base portion can be easily and reliably disposed in a state having an arbitrary angle set in advance, and can be bonded in a state having strength.

FIG. 1 is a view showing an example of fins of a surfboard according to the present invention. The fin 1 shown in this figure is composed of a base 10 and a fin body 11.
The main body shape 11 of the fin is curved in an arc shape and shows one example that is generally used.
The fin base 10 having such a shape has a bulge and is formed in a thick shape, and the width gradually decreases toward the tip of the fin 1. It has a width.
Therefore, the bottom portion of the fin has the largest width, and has a substantially water-drop-shaped bottom shape from the front to the rear of the fin.

In this case, this bulge is preferably at least about three times the thickness of the fin of the flat plate portion, and preferably at least about twice the widest portion of the bottom portion.
This means that, when the fin is mounted on the board, the bottom surface portion 12 has a large area because of its thickness compared to a general fin, and a wide contact surface with the board 2 can be taken. In addition to being able to be positioned precisely, it is in contact with the bottom portion of the board 2 in a wide area of the bottom surface portion 12, and can be firmly bonded by, for example, a laminate such as a glass cloth, so that the adhesive strength can be kept high. Is.
In this case, since the thick base portion 10 is connected to the board 2, roving for increasing the thickness is not required, the work process can be greatly simplified, not only the workability of the board manufacturing is improved, but also the cost is reduced. It will also lead to.

Further, since the thick base 10 is made of an integrally formed fin, the strength of the fin itself is increased, and the sanding work step normally performed for obtaining this shape is not required, and the conventional sanding laminate is used. The thickness that has been cut is also eliminated.
In other words, the conventional method uses sanding to smooth the surface after bonding fins with glass cloth or the like using roving, and this causes the laminated glass cloth part to be scraped off, resulting in a thin plate of fins. Since the rovings arranged in the same direction as the main remains mainly, the wobbling of the fins is likely to occur. On the other hand, the work procedure itself is simplified and the strength can be further increased. .

  Since the base 10 of the fin itself has a thick shape in advance, when the board 2 is disposed on the bottom, this joint is particularly thickened by laminating roving, etc. to eliminate water resistance. Without creating a rounded shape, fins can be arranged neatly and with a good appearance, for example, by laminating the surface with a glass cloth or the like.

In addition, this thickness shape may consist of a structure which has a collar part which becomes the same plane as the bottom face part of a flat fin.
That is, in the case where the fin base 10 and the flat fin body 11 are provided, a flat bottom surface is provided by having a flange that is flush with the bottom surface portion 12 at the peripheral portion of the bottom surface portion 12 of the fin base 10. As a result, the portion 12 and the surface of the flange portion constitute the bottom surface portion 12, and a wide flat surface portion can be secured thereby.

Therefore, this also functions in the same manner.
Although various descriptions are given above, these are examples of the present invention, and the present invention is not limited to this embodiment.
Furthermore, although it is clearly indicated as a flat surface, it does not indicate only a horizontal surface, and a flat surface having a slight round shape or unevenness is naturally included in the flat surface specified in this specification.
Next, the fin base 10 may have a shape having a thick base in advance by using the same material as the fin itself, and the same material as the fin such as a resin material or the like, which is thickened by laminating with a glass cloth, for example. It may be a fin manufactured by any method using a thick shape using various other various materials.

7 to 13 show a conventional fin shape, which is a flat fin 3.
Therefore, when such a conventional flat fin 3 is bonded to the board 5 without a fin box, the bottom surface 32 of the very long fin 3 is bonded by roving and laminating glass cloth in contact with the board 5. As a result, the film could not be adhered firmly unless it was applied to several layers.
For these reasons, screw fixing or the like is often used for the fin 3 at present, and there is a screw fixing portion 33 in the forward direction of the base portion of the fin as shown in FIG. The fin box 4 is mounted on the board 5 in advance and the fin 3 is screwed.
Even in this case, the fins 3 are flat.

8 is a view showing the conventional fin shape of FIG. 7, and FIG. 9 is an end view of the fin 3 viewed from the front direction.
As shown in these figures, when the fin 3 is attached by using the fin box 4, it is not necessary to fix the fin by roving or the like, and it is used in a flat plate shape.
Therefore, this is inevitably subjected to water resistance when the water is cut in the flat portion of the flat plate.
FIG. 10 is a diagram showing a conventional example in which another fin box 4 is similarly used, and the fin 3 has two tongue-shaped protrusions 34 at the base portion, and each protrusion After the portion 34 is inserted into the fin box 4, the screw member 6 is fastened from the lateral direction of the fin box 4.

FIG. 11 is a cross-sectional view taken along line B-B in FIG. 10, and shows an example of a fixed state in which the fin 3 is screwed by the fin box 4.
12 is a perspective view of the fin 3 shown in FIGS. 10 and 11, and FIG. 13 is a cross-sectional view taken along the line CC of FIG.
In addition, although the board of one fin is shown as a prior art example, it is only clarified as an example, and even if it is a board which has two fins, three fins, or a board which has four or more fins, Is the same.
As described above, the plate-like fins 3 are difficult to attach to the board when the fins are securely attached, and this is laminated with glass cloth or roving as it is and arranged in place and has strength. Installation is very labor intensive and requires skill.

Therefore, as shown in FIG. 7 and the following figures, the fin box 4 is used to arrange the fin 3 from the viewpoint of workability and cost. In this case, the fin box 4 itself is now used as described above. Must be disposed, and the cost of the fin box 4 is additionally charged.
Further, in order to facilitate the insertion into the fin box 4, the fin 3 is inevitably maintained in a flat shape, and an unnecessary vortex is generated in the flat portion when water is drained, resulting in resistance. It is what
Further, it has a flat plate shape, and its strength is not so high, and a very large force is applied to the screwing portion and the like.
As a result, breakage at the screwing portion or the like is likely to occur.

From the above, there is provided a fin 1 that has a fin base 10 shown in FIG. 1 having a thick shape and gradually decreases its thickness toward the tip of the fin, and further has a wide bottom portion. By this, it becomes integral molding which has a thick base part, and it can keep high intensity | strength, and can take a wide contact surface with a board, and can keep adhesive strength high.
Moreover, the flow of water can be controlled by configuring this thick portion in a substantially water droplet shape in cross section, and the resistance of water applied to the side surface can be reduced.
Furthermore, even with a configuration in which the thickness is gradually reduced toward the top of the fin, water resistance at this portion can be kept small.
In addition, by configuring the fin base 10 so as to be a so-called water droplet type in a plan view, water flowing along the side surface flows along the arc-shaped side surface, so that the resistance of the water can be reduced.

FIG. 2 is a cross-sectional view of the fin 1 of FIG.
As shown in this figure, the fin body 11 from the fin central portion to the tip portion is formed in a substantially flat plate shape, but the bottom portion of the fin base 10 is the thickest and gradually toward the tip of the fin. Further, the thickness is reduced.
The structure of this figure shows an example in which the thickness of the fin and the thickness of the base have a width of about 3 times, but it is not limited to this. For example, it may be about 4 times or 5 times. Of course, it may be more than 6 times.
Of course, it may be about 1.5 to 2 times or more.
Further, the bottom surface portion 12 of the fin base portion 10 constitutes a substantially planar bottom surface.

This is a surface in contact with the bottom surface of the board 2 and may be a flat surface or a surface having a substantially arc shape. Of course, the surface may be uneven as described above.
That is, it is desirable that it matches the planar shape of the bottom surface so that it can be placed exactly on the bottom surface.
Therefore, it is not necessarily limited to match, and may be anything that matches with a slight deviation or width, and can be bonded to the bottom surface with a curved or uneven shape as well as a horizontal plane. Anything that matches the degree is acceptable.
As will be described later, the plane is not limited to a plane perpendicular to the fins, but may be a plane based on an inclined plane.

3 and 4 are diagrams showing examples of side fins.
As for the side fins, for example, fins located on both sides of a board using three fins are clearly shown, and the same fins are used.
The fins installed at this position are installed on both sides of the bottom of the board 2 and are arranged in a slightly inclined state in order to further improve straightness and stability.
In this case, the fin main body 11 that is inclined with respect to the bottom surface portion 12 is shown in FIG. 3 and FIG.

Also in this case, the fin main body 11 is connected to the thick base portion 10, and can contact the bottom surface of the board 2 in a wide area range of the bottom surface portion 12, so that the fin body 11 can be firmly bonded.
In particular, when the fins 1 are bonded with a slight inclination, the conventional base is also a very skillful operation and laborious when the flat fins 3 are used. Thus, it is possible to perform the bonding in a state where it is firmly fixed at a fixed position, and further, a glass cloth is laminated and bonded to a board in a wide range of a thick base portion.

Therefore, it is possible to perform laminating and bonding with sufficient strength and strength without roving and without this effort.
This facilitates the attachment of the fins to be disposed in an inclined manner, improves the workability, and enables provision of fins with an arbitrary angle in advance, which can be easily attached. It will be.
Note that the fin base 10 is clearly configured as a so-called water droplet type in plan view, but in addition to its shape, for example, in the side fins, the side portion located in the center direction of the board is somewhat It may be a straight shape, and a substantially D-shaped shape based on a substantially water drop shape in which the side portion located outside is an arc shape.
Also by this, the water which flows through the side surface corresponding to this side will flow along the side surface.
Of course, the fin itself may be based on this shape.

FIG. 5 is a diagram showing the arrangement state of the fins 1 as seen from the tail portion. Since the bottom surface of the board 2 and the base portion 10 of the fins are bonded at the thick portion of the fins, they are bonded over a wide area. In addition, since the fin itself is integrally formed with the thick base 10, it can exhibit extremely high strength.
FIG. 6 is a diagram illustrating an example of the bottom surface of the board 2 on which the fins 1 are arranged.
As shown in the figure, the fins 1 are each attached to the bottom.
In particular, the fin located at the center is configured to be a so-called water droplet type with respect to the base portion 10, and the fin located at the side has a slightly straight side portion located in the center direction of the board with respect to the base portion 10. Thus, the side portion located outside is arc-shaped, and is configured to have a substantially D-shaped shape based on a substantially water drop shape.

7 and the subsequent figures show the conventional fin 3 shape.
As described above, for the fin according to the present invention, the base 10 is made thick, and the fin 1 having a bottom surface 12 corresponding to the thick portion is used while being gradually thinned toward the fin tip direction. Therefore, not only can the manufacturing workability be improved and the cost can be reduced, but also the strength of the fin itself can be increased, which is an extremely useful invention.

The figure which shows an example of the fin of the surfboard which concerns on this invention AA line sectional view of FIG. Sectional drawing which shows an example of the fin arrange | positioned at the bottom side of the surfboard which concerns on this invention Sectional drawing which shows an example of the fin arrange | positioned at the bottom side of the surfboard which concerns on this invention The figure which shows the arrangement | positioning state of the fin which concerns on this invention visually recognized from the tail part of the surfboard The figure which shows an example of the bottom face of the surfboard which arranged the fin which concerns on this invention The figure which shows an example of the arrangement | positioning state of the conventional fin The figure which shows the shape of the fin used for FIG. Front view for representing the thickness of the fin shown in FIG. The figure which shows another example of the arrangement | positioning state of the conventional fin BB sectional view of FIG. The perspective view of the fin shown in FIG.10 and FIG.11. CC sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fin 10 Fin base part 11 Fin main body 12 Bottom surface part 2 Surfboard 3 Conventional fin 32 Conventional fin bottom face 33 Conventional fin screwing part 34 Conventional fin protrusion part 4 Fin box 5 Conventional surfboard 6 Screw member

Claims (5)

Fins used for surfboards,
The fin 1 includes a fin base 10 and a fin body 11.
1. A fin characterized in that the fin base portion 10 has a thick shape and is gradually thinned toward the tip of the fin and has a bottom surface portion 12 having a flat surface corresponding to the thick portion. Fins used for surfboards,
The fin 1 includes a fin base 10 and a flat fin body 11.
A fin having a flange that is in the same plane as the bottom surface of the fin base 10. The fin according to claim 1, wherein the bottom surface portion 12 formed of a flat surface is formed of a flat surface that matches the bottom surface of the surfboard. The fin according to any one of claims 1 to 3, wherein the fin base portion 10 has a substantially water droplet shape from the front direction toward the rear direction. The fin according to any one of claims 1 to 4, wherein the fin main body (11) is configured to be inclined with respect to the plane of the bottom surface portion (12) of the fin base portion (10).

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