JP2004009750A - Surfboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surfboard with a simple structure capable of securing enough strength and having easy separating/joining operability. <P>SOLUTION: A first board 2 and a second board 3 which are filled with foamed urethane foam 7 within outer shells 6 and 22 made of FRP are joined attachably/detachably at first and second joining parts. Each of the joining parts is made to become connecting pieces 14 and 29 by extending and superimposing ends of upper and lower shells 4, 5, 20 and 21 composing the outer shells 6 and 22. Step parts 10 and 25 formed on the board are covered with the connecting pieces 14 and 29 and secured with a countersunk screw 32. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a surfboard used for surfing, and more particularly to a surfboard that can be transported in a divided manner.
[0002]
[Prior art]
A conventional surfboard is a single board in which an upper shell and a lower shell made of fiber reinforced plastic (hereinafter, referred to as FRP) are joined in a thickness direction to form an outer shell, and the outer shell is filled with urethane foam. . The conventional surfboard is manufactured with the length set to about 2 m in consideration of ease of transportation.
[0003]
[Problems to be solved by the invention]
By the way, since a surfboard travels along a wave while controlling the weight of the surfboard by shifting the weight, the longer the total length, the better the stability. However, if the total length is increased, the transport becomes difficult.
In order to solve the difficulties in transporting, it is conceivable to construct so as to be able to be separated from the middle of the entire length, and to join them at the joint when using.
[0004]
However, the strength, especially the bending strength, is insufficient simply by being able to separate or join at the joint. Therefore, in order to increase the bending strength, it is generally conceivable to form the joint portion with a pipe or sleeve made of metal or carbon fiber reinforced plastic, or to form an inlay or a dovetail groove. However, in practice, it is extremely difficult to fabricate inlays and dovetail grooves by FRP. In this case, metal must be used, and the use of metal parts increases the weight and significantly increases the manufacturing process. Will increase. Further, if the structure of the joint becomes complicated, the assembling work becomes troublesome and cannot be put to practical use.
[0005]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and a purpose thereof is to provide a surfboard having a simple structure, capable of securing sufficient strength, easily performing separation and joining operations, and having a high assembling accuracy. It is something to offer.
[0006]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and the invention according to claim 1 has a first outer shell in which a first upper shell and a first lower shell made of a synthetic resin are joined in a thickness direction. A first board in which a first joint portion is formed at one end of a first outer shell, and a second upper shell and a second lower shell made of a synthetic resin are joined in a thickness direction thereof. A second board in which an outer shell is filled with a synthetic resin foam material and a second joint is formed at one end of the second outer shell, and the first joint and the second joint are detachable from each other. A surfboard that joins and combines a first board and a second board into a series of boards,
The first joining portion forms a first step portion at an end of the first upper shell on the first joining portion side and bends a tip portion thereof downward to form a first fore portion, and further comprises a first fore portion. The lower end extends in the horizontal direction to form a first upper overlap portion, and the first joint side end of the first lower shell extends forward of the first small opening to form a first lower overlap portion. Forming a first connecting piece by polymerizing the first lower polymerization section and the first upper polymerization section;
The second joining portion forms a second step at the end of the second lower shell on the side of the second joining portion, and bends the tip of the second step upward to form a second fore edge. The upper end extends in the horizontal direction to form a second lower overlap portion, and the end of the second upper shell on the side of the second joint portion extends forward of the second small opening portion to form a second upper overlap portion. Forming a second connecting piece by polymerizing the second upper polymerization section and the second lower polymerization section,
The second connecting piece is placed on the first step and the first connecting piece is placed on the second step, and each connecting piece is fastened to each step by detachable fastening means. Is a surfboard characterized by combining the surfboards in a series.
Here, the surfboard in the present application is a concept including a windsurfing board.
[0007]
According to the second aspect of the present invention, the fastening means includes a female screw member embedded in the step portion and a male screw member screwable to the female screw member, and is inserted into a hole formed in the connecting piece. The surfboard according to claim 1, wherein the first joint portion and the second joint portion are detachably joined by screwing the male screw member to the female screw member.
[0008]
According to a third aspect of the present invention, the shell is made of a fiber-reinforced synthetic resin in which fibers are buried and reinforced inside, and the fibers are continuous from a step portion to a polymerization portion through a small opening portion. A surfboard according to claim 1 or claim 2.
[0009]
According to a fourth aspect of the present invention, the second fore part has a convex shape in which a central part in the left-right direction protrudes to the front side, and the first fore part has a concave part in which a central part in the left-right direction is depressed to the front side,
2. The fixing means according to claim 1, wherein the position of the fastening means is shifted rearward in order from the central part in the left-right direction of the board so as to correspond to the direction of the irregularities, and another fastening means is arranged. A surfboard according to any one of claims 1 to 3.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a surfboard 1 according to the present invention in a joined state, and FIG. 2 is a perspective view of a joined portion in a state of being separated into a first board 2 and a second board 3.
[0011]
As shown in FIG. 1, the surfboard 1 is a substantially willow-leaf-shaped plate material, and the first board 2 in the first half shown on the left side of the figure and the second board 3 in the second half shown on the right side are detachably joined to each other. Have been.
[0012]
As shown in FIGS. 1 to 3, the first board 2 is made of a first upper shell 4 made of a fiber-reinforced synthetic resin (FRP in which fibers 8 such as glass and carbon are arranged at substantially the center of the inside of the plate thickness in this embodiment). And the first lower shell 5 are joined in the thickness direction to form a first outer shell 6, and the first outer shell 6 is filled with a synthetic resin foam material (a hard urethane foam 7 in the present embodiment). A first joint 9 is formed at one end (rear end) of the outer shell 6. As shown in FIG. 1, the first upper shell 4 gently widens from the narrow tip (front side) to the rear, and the cross-sectional shape in the width direction is such that the left and right sides are, as shown in FIG. It is curved in a substantially arc shape downward. The first lower shell 5 joined from below to the first upper shell 4 gradually widens from the narrow front end to the rear corresponding to the first upper shell 4, and has a cross-sectional shape in the width direction. As shown in FIG. 4, the right and left sides are curved upward in a substantially arc shape. Therefore, when the first upper shell 4 and the second lower shell are vertically bonded and adhered with an adhesive, the first outer shell 6 having a void inside can be formed. Then, when the rigid urethane foam 7 is foamed and filled in the first outer shell 6, the first board 2 is obtained.
[0013]
The first joint portion 9 provided at the rear end of the first board 2 is provided at a first joint portion 9 side end (rear end) of the first upper shell 4 with a first step portion 10 in which a second connecting piece described later is just fitted. Is formed into a U-shape with a horizontal cross section, and the front end portion (the rear end in the front-rear direction of the board 2) of the first step portion 10 is bent obliquely downward to form an oval first small opening portion 11. In addition, the lower end of the first fore edge portion 11 is extended rearward in the horizontal direction to form a first upper overlap portion 12 having a U-shaped cross section, and the first lower shell 5 on the first joint portion 9 side. The end (rear end) is extended forward (the rear end in the front-rear direction of the board) beyond the first fore edge 11 to form a first lower overlap portion 13 having a U-shaped cross section, and The first lower piece 13 and the first upper part 12 are bonded together in a superposed state to form the first connection piece 14. Therefore, the first connecting piece 14 is formed by integrating the two FRPs of the first upper shell 4 and the first lower shell 5, and the fiber 8 of the FRP constituting the first upper shell 4 is formed by the step portion 10. Through the first fore edge portion 11 to the first upper polymerization portion 12, and the FRP fibers constituting the first lower shell 5 are continuous to the first lower polymerization portion 13, and these fibers are continuous. It is a tough piece because the plates are doubled and integrated. A plurality of countersunk holes 15 for countersunk screws are formed in the first connecting piece 14 in the width direction. The opening position of the hole 15 is a position corresponding to a female screw member provided in a second step portion of the second board 3 described later.
[0014]
Further, in the first step portion 10, a nut 16 with a retaining as a female screw member is embedded and fixed at a plurality of positions in the width direction. The nut 16 is buried at a position corresponding to a hole of a second connecting piece, which will be described later, at the time of manufacturing the FRP.
[0015]
Similarly to the first board 2, the second board 3 is formed by joining a second upper shell 20 and a second lower shell 21 made of FRP in a thickness direction to form a second outer shell 22. The inside 22 is filled with urethane foam 7, and a second joint 23 is formed at one end (front end) of the second outer shell 22. As shown in FIG. 1, the second upper shell 20 gradually widens from the narrow rear end toward the front, and the cross-sectional shape in the width direction is such that both left and right sides are curved in a substantially arc shape downward. ing. The second lower shell 21 joined from below to the second upper shell 20 gradually widens from the narrow rear end toward the front corresponding to the second upper shell 20, and has a cross section in the width direction. The shape is such that both left and right sides are curved upward in a substantially arc shape. Therefore, when the second upper shell 20 and the second lower shell 21 are vertically aligned and adhered by an adhesive, the second outer shell 22 having an internal space can be formed. When the rigid urethane foam 7 is foamed and filled, the second board 3 is obtained.
[0016]
The second joint portion 23 provided at the front end of the second board 3 is a second step portion at which the first connection piece 14 just fits from below at the end (front end) of the second lower shell 21 on the side of the second joint portion 23. 25 is formed in an oblong U-shape in cross section, and the tip portion (the front end in the front-rear direction of the board 3) of the second step portion 25 is bent obliquely upward to form an oval second small opening 26, In addition, the upper end of the second fore-edge portion 26 extends forward in the horizontal direction to form a second lower overlap portion 27 having a U-shaped cross section, and the second upper shell 20 on the side of the second joint portion 23. The end portion (front end) is extended forward of the second fore edge portion 26 (forward in the front-rear direction of the board 3) to form a second upper overlap portion 28 having a U-shaped cross section. (2) The upper portion 28 and the second lower portion 27 are superposed on each other and bonded with an adhesive to form a second connection having a U-shaped cross section. 29 make up the. Therefore, the second connecting piece 29 is formed by integrating the two FRPs of the second upper shell 20 and the second lower shell 21, and furthermore, the fiber 8 of the FRP constituting the second lower shell 21 is formed by the step portion 25. Through the second fore edge portion 26 to the second lower polymerization portion 27, and the FRP fibers constituting the second upper shell 20 are continuous to the second upper polymerization portion 28, and these fibers are continuous. It is a tough piece because the plates are doubled and integrated. A plurality of countersunk holes 30 for countersunk screws are formed in the second connecting piece 29 in the width direction. The opening position of the hole 30 is a position corresponding to the female screw member (nut 16) provided in the first step portion 10 of the first board 2.
[0017]
Further, in the above-mentioned second downward stepped portion 25, a nut 31 with a retaining as a female screw member is embedded and fixed at a plurality of positions in the width direction. The position where the nut 31 is embedded is a position corresponding to the hole 15 of the first connecting piece 14 described above.
[0018]
Next, a procedure for joining the first board 2 and the second board 3 having the above-described configuration will be described.
When the vehicle arrives at a place of use such as a beach, as shown in FIG. 2, the first joint 9 located at the rear end of the first board 2 and the second joint 23 located at the front end of the second board 3 are separated. The first connecting piece 14 of the first board 2 is placed under the second step 25 of the second board 3, and the second connecting piece 29 of the second board 3 is placed on the first step 10 of the first board 2. The holes 15 and 30 are respectively put on the upper portions so that the holes 15 and 30 correspond to the female screw holes of the female screw members (nuts 16 and 31). In this state, countersunk screws 32 which are a kind of fastening means are inserted into the holes 15 and 30. Screw it into the female screw hole and fix it. When the flat head screw 32 has a hexagonal hole, it can be easily and securely tightened with a hexagonal wrench. In this embodiment, the countersunk screw 32 is used as the fastening means, so that the countersunk hole 15 and the countersunk head of the countersunk screw 32 exert a position function when tightening and fixing, so that the joint position can be accurately determined. It is possible to secure high assembling accuracy and to join in a state according to the above.
[0019]
In this manner, when the countersunk screws 32 are inserted from all the holes 15 and 30 and sufficiently tightened, as shown in FIG. 3, the first fore-edge 11 and the second fore-edge 26 are fitted from the front and back, and The second connecting piece 29 fits in the first step portion 10 and the first connecting piece 14 fits in the second step portion 25, so that the outer surface of the first board 2 and the outer surface of the second board 3 become the same surface. , The first board 2 and the second board 3 are united in a series.
[0020]
Therefore, the first board 2 and the second board 3 combined in this manner can be used as one surfboard 1. Even if a surfer rides on the surfboard 1 and the weight acts on the surfboard 1 as a bending stress, the surfer jumps down from a height of about 3 m onto the surfboard 1 due to a wave drop during surfing, and a large bending stress occurs. Does not damage the joints 9 and 23.
[0021]
That is, when a load is applied to the surfboard 1 from above, a bending moment is generated in a direction in which the lower portions of the first and second small opening portions 11 and 26 are opened, thereby screwing into the nut 31 of the second board 3. The countersunk screw 32 pulls the first connection piece 14 relatively to the right in FIG. The tensile force at this time acts on the first upper overlap portion 12 and the first lower overlap portion 13 constituting the first connection piece 14 and is dispersed to the first upper shell 4 and the first lower shell 5. You. Therefore, even if a large pulling force acts on the first connecting piece 14, the first connecting piece 14 can be sufficiently received by the dispersion of the force and is not damaged.
[0022]
In the present embodiment, the FRP fibers 8 constituting one shell are continuous from the step portions 10 and 25 to the one overlapping portion via the fore-edge portions 11 and 26 and constitute the other shell. The FRP fibers are continuous up to the other polymerized portion, and the portions where these fibers are continuous are overlapped and integrated to form the connecting pieces 14 and 29, so that sufficient strength can be secured. The FRP of the shell has a thickness of about 2 mm, and the thickness of the connecting pieces 14 and 29 including the adhesive layer is about 4.5 mm. Further, in the present embodiment, since the distance P between the front side countersunk screw 32 and the rear side countersunk screw 32 fixing the connecting pieces 14 and 29 is large, the pulling force generated by the bending moment is advantageously reduced. is there.
[0023]
Further, when a load is applied to the surfboard 1 from below and a bending moment is generated in a direction in which the upper portions of the first and second fore-edge portions 11 and 26 open, the second connecting piece is formed according to the same principle as described above. The tensile force acting on the second upper shell portion 29 and the second lower shell portion 21 can be dispersed in the second upper overlap portion 28 and the second lower overlap portion 27. Therefore, even if a large pulling force acts on the second connecting piece 29, the second connecting piece 29 can be sufficiently received and is not damaged.
[0024]
Then, when surfing is completed and the user arrives on the way home, the surfboard 1 can be easily separated into the first board 2 and the second board 3 by simply removing the countersunk screw 32, and the total length can be reduced by half. Therefore, even when transported on a car or transported by train, the overall length can be shortened and handling is easy.
[0025]
In addition, the surfboard 1 in the present invention is a concept including a windsurfing board that sails on water using a wind by stretching a sail.
Further, in the above-described embodiment, the flathead screw 32 and the nuts 16 and 31 are used as the fastening means. However, the present invention is not limited to this, and for example, a clamp, a fastener, or the like may be used. In short, it is only necessary that the fastening force is sufficient and the fastening can be detachably performed.
[0026]
In the above-described embodiment, the countersunk screw 32 and the nuts 16 and 31 as fastening means are arranged in a straight line in the width direction of the board, but the fastening means is not limited to this. For example, in another embodiment shown in FIG. 5, the central portion in the left-right direction of the second fore edge portion 26 has a convex shape protruding to the front side, and the first fore edge portion 11 has the central portion in the left-right direction to the front side. The shape of the first and second connecting pieces 14 and 29 is made concave and convex according to the shape of the surface of the first and second fore-edge portions 11 and 26. Then, the positions of the fastening means (holes 15, 30 for inserting the countersunk screw 32 and the nuts 16, 31) corresponding to the directions of the irregularities of the first and second small-portions 11, 26 are set at the center in the left-right direction of the board. Another fastening means may be arranged by shifting the position rearward sequentially from the one arranged in the part. In this way, when the position of the fastening means is slightly shifted in the front-rear direction, the bending moment can be received in a dispersed state, and higher strength can be expected.
[0027]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
That is, since the surfboard can be divided into the first board and the second board, the surfboard can be separated at the time of transportation even if the overall length is increased and the stability in use is increased. Therefore, handling such as transportation is easy.
And since the connecting piece of the joining part which joins a 1st board and a 2nd board is comprised by superposing the upper and lower superposed pieces which extended the upper and lower shells, the pulling force which acts on a connecting piece is kept as it is. Can be distributed between upper and lower shells. Therefore, a sufficiently strong joining structure can be obtained with a simple structure, the joining and separating operations are easy, and the handling is simple.
[Brief description of the drawings]
FIG. 1 is a perspective view of a surfboard.
FIG. 2 is a perspective view showing a state where a first joint portion of the first board and a joint portion of the second board are removed.
FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 in a state in which a first joint of the first board and a joint of the second board are joined.
FIG. 4 is a sectional view of a first board and a second connecting piece.
FIG. 5 is a plan view of a main part of another embodiment in which the position of the fastening means is gradually changed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Surfboard 2 1st board 3 2nd board 4 1st upper shell 5 1st lower shell 6 1st shell 7 Urethane foam 8 FRP fiber 9 1st junction 10 1st step 11 1st edge 12 1st Upper overlapping section 13 First lower overlapping section 14 First connecting piece 15 Hole 16 Nut 20 as a female screw member Second upper shell 21 Second lower shell 22 Second outer shell 23 Second joining section 25 Second step section 26 Second Small edge 27 Second lower overlapping portion 28 Second upper overlapping portion 29 Second connecting piece 30 Hole 31 Nut 32 Countersunk screw F as male screw member Front R Rear

Claims (4)

A first outer shell in which a first upper shell and a first lower shell made of synthetic resin are joined in the thickness direction is filled with a synthetic resin foam material, and a first joint portion is formed at one end of the first outer shell. A board, a second upper shell made of a synthetic resin, and a second lower shell joined in a thickness direction are filled with a synthetic resin foam material in a second outer shell, and a second joint is formed at one end of the second outer shell. A surfboard comprising a first board and a second board, the first board and the second board being joined together in a detachable manner, and
The first joining portion forms a first step portion at an end of the first upper shell on the first joining portion side and bends a tip portion thereof downward to form a first fore portion, and further comprises a first fore portion. The lower end extends in the horizontal direction to form a first upper overlap portion, and the first joint side end of the first lower shell extends forward of the first small opening to form a first lower overlap portion. Forming a first connecting piece by polymerizing the first lower polymerization section and the first upper polymerization section;
The second joining portion forms a second step at the end of the second lower shell on the side of the second joining portion, and bends the tip of the second step upward to form a second fore edge. The upper end extends in the horizontal direction to form a second lower overlap portion, and the end of the second upper shell on the side of the second joint portion extends forward of the second small opening portion to form a second upper overlap portion. Forming a second connecting piece by polymerizing the second upper polymerization section and the second lower polymerization section,
The second connecting piece is placed on the first step and the first connecting piece is placed on the second step, and each connecting piece is fastened to each step by detachable fastening means. A surfboard characterized by combining a series of. The fastening means includes a female screw member embedded in the step portion and a male screw member that can be screwed into the female screw member. The male screw member inserted into a hole formed in the connecting piece is screwed into the female screw member. The surfboard according to claim 1, wherein the first joint and the second joint are joined in a detachable state. The shell according to claim 1 or 2, wherein the shell is made of a fiber-reinforced synthetic resin reinforced by burying fibers therein, and the fibers are continuous from a step portion to a polymerization portion through a small opening portion. The surfboard described. The second fore edge has a convex shape in which a central portion in the left-right direction protrudes to the front side, and the first fore edge has a concave shape in which a central portion in the left-right direction is depressed to the front side,
2. The fixing means according to claim 1, wherein the position of the fastening means is shifted rearward from the one arranged at the central portion in the left-right direction of the board in order to correspond to the direction of the unevenness, and another fastening means is arranged. The surfboard according to any one of claims 1 to 3.

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