JP4209401B2 - Surfboard fin mounting structure - Google Patents

Description

   The present invention relates to a fin mounting structure for a surfboard, and more particularly to a fin mounting structure capable of detachably fixing a fin to a board body without using a screw or the like.

Fins are attached to the bottom surface of the board body to ensure the directionality and stability of the surfboard. At this time, in order to make it possible to use an optimum fin for the convenience of transportation or according to the wave condition or the like, there are some which can remove the fin from the board body. In this case, for example, in Patent Document 1, instead of detaching the fin with a screw, a pin is provided at the base of the fin, and the fin is arbitrarily attached or detached by fitting the pin into a groove formed in the board body. I can do it.
Utility model registration No. 102517

  However, in the conventional fin mounting structure, since the pin and the groove are fitted in a complicated path, even if the surfer falls and touches the fin of the board body, the fin does not come off from the board body and touches the fin. There was a problem that Surfer's body was hurt.

  Therefore, the present invention solves such a problem, and the fin can be detachably fixed to the board body without using a screw or the like, and when the surfer falls and touches the fin, the fin is quickly It is an object of the present invention to provide a fin mounting structure for a surfboard that can be removed from the board body and avoid injury to the surfer body.

In order to achieve the above object, in the first invention, a recess (11) for fitting the base (3) of the fin (F) is formed in the board body (B) of the surfboard, and the fin base (3) A first shaft body (34) is provided through the front end portion (31) of the fin, and only the front end portion (31) of the fin base portion ( 3) is provided in the recess (11). The first locking part (41) for locking the first shaft body (34) so as to be detachable and rotatable in a state of being fitted in the front end part (31) of the fin base part (3) is locked. The second locking portion (11c, 35, 42) for locking the rear end portion (32) of the fin base portion (3) in the state is provided, and the second locking portion (11c, 35, 42) The locking state is canceled only with a predetermined turning operation force around the first shaft body (34), and the rear end of the fin base (3) is placed in the recess (11). Is set to be able to escape, the second engaging portion, a second shaft which is provided by penetrating it to a rear end portion of the fin base (3) (35), the recess (11 ) Are formed on the opposite side surfaces of the second shaft body (35) and both ends of the second shaft body (35) are fitted, and the second groove (42) is formed by the first shaft body (34). ) Along the movement trajectory of the second shaft body (35) except for a part thereof and reaching the opening of the recess (11) .

  In the first invention, when the fin base is fitted into the recess of the board body, the first shaft provided on the fin base is detachably locked by the first locking portion, and the rear end of the fin is Locked by the second locking portion, the fin is fixed to the board body without using a screw or the like. When removing the fin from the board body, if the rotation operation force more than a predetermined centering on the first shaft body is applied to the fin, the locking state of the second locking portion is canceled and the fin base portion is moved to the first shaft. The body is pivoted away from the board main body, and then the locking state of the first locking portion is canceled and the fins can be easily removed from the board main body. When the board is in use, the surfer falls over and touches the fin, and when a rotational operation force of a predetermined level or more about the first shaft is applied, the locked state of the second locking portion is canceled and the fin Since the base is pivoted away from the board body around the first shaft body, damage to the surfer body can be avoided.

In the second aspect of the present invention, the second locking portion is further provided in the recess (11) partly entered into the rotational trajectory of the rear end of the fin base (3) with the first shaft body (34) as the center. The rear end face (11c) is used.

  In the third aspect of the present invention, the first shaft (34) is formed on the front end (31) of the fin base (3) by forming the first locking portion on the opposite side surfaces of the recess (11). The front end surface (41a) of the first groove (41) is the first groove (41) with the fin base (3) inserted into the recess (11). It is in contact with the uniaxial body (34).

In this 4th invention, the said 1st groove | channel (41) and the 2nd groove | channel (42) are connected by the 3rd groove | channel (43) extended in a front-back direction at a recess (11) side surface. According to the fourth aspect of the present invention, the first shaft body can escape from the recess through the second groove through the third groove, and even if the surfer falls and touches the fin, Since it is not easily detached, the loss of the fins can be prevented.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the fin mounting structure of the surfboard of the present invention, the fin can be detachably fixed to the board body without using a screw or the like, and when the surfer falls and touches the fin, The fins can be removed from the board body to avoid injury to the surfer body.

  FIG. 1 shows a perspective view of the fin mounting portion of the surfboard, and FIG. 2 shows a cross-sectional view with the fins attached. In each figure, the resin mounting member 1 is embedded in the bottom surface of the board body B of the surfboard. The resin-made fin F is composed of a fin body 2 that is curved while being tapered, and a fin base portion 3 that is fitted into a mounting member 1 on the board body B side described later. The fin base 3 has a substantially rectangular plate shape and is integrally formed with the fin main body 2 so as to be displaced in the front-rear direction. The fin base 3 is formed with a through hole 33 that penetrates the plate surface in the thickness direction at the front end portion 31 and the rear end portion 32, respectively, and a first shaft body 34 and a second shaft body 35 are formed at the center of each through hole 33. It is inserted. A rubber layer 36 is provided between the outer periphery of the first shaft body 34 and the second shaft body 35 and the inner periphery of the through-hole 33, and the first and second shaft bodies 34, 35 can be moved eccentrically by a certain amount in the through-hole 33. The front end surface of the fin base 3 is formed in a circular arc shape in the upper half of the figure (the lower half when the board is used), and the lower half is a regulation surface 34a that is chamfered in a flat shape. Further, the rear end surface 32a of the fin base 3 is formed such that the lower half of the figure is a convex curved surface.

  The attachment member 1 is an elongated container body having a fixed length that opens upward in the drawing (ie, below the bottom surface of the board body B), and is embedded in the bottom surface of the board body B, and is an elongated recess surrounded by the side wall of the container body. The portion 11 has a shape substantially equal to the outer shape of the fin base 3. That is, the recess 11 has a front end surface 11 a formed into an arcuate surface along the upper half of the front end surface of the fin base 3, and the bottom surface 11 b is a plane along the lower surface of the fin base 3. The rear end surface 11c of the recess 11 has a shape substantially along the rear end surface 32a of the fin base 3, and the upper half of the rear end surface 11c is curved outward at the opening edge of the recess 11.

  Grooves 4 having a slightly larger width than the outer diameters of the first and second shaft bodies 34 and 35 are formed on the side surfaces of the recess 11 facing in the width direction. The groove 4 is formed at the front end of the side surface and curved upward (downward when the board is used) to close the tip, and the groove 4 is formed at the rear end of the side surface and reaches the opening of the upper recess 11. The second groove 42 is open, and the third groove 43 extends in the front-rear direction to allow the first groove 41 and the second groove 42 to communicate with each other. Here, a recess 44 having a shape along the outer periphery of the second shaft body 35 along the rear half of the second shaft body 35 and a convex portion 45 are formed directly above the corner portion of the boundary between the second groove 42 and the third groove 43. Yes.

  In such a fin mounting structure, when the board is used as shown in FIG. 3 (1) upside down with respect to FIG. 2, the first shaft body 34 provided at the front end portion 31 of the fin base 3 has the first groove strip. The fin base 3 and the fin main body 2 can be rotated around the first shaft body 34. At this time, the second shaft body 35 is located in the concave portion 44 of the second groove 42, and even if the second shaft body 35 tries to move downward along a rotation locus centering on the first shaft body 34, Part of the second groove 42 deviates from the movement locus of the second shaft body 35 due to the presence of the convex portion 45, and therefore the movement of the second shaft body 35 is restricted.

  Further, since the rear end surface 11c of the recess 11 is mostly shaped along the rear end surface 32a of the fin base portion 3, the rear end of the fin base portion 3 is downward along the rotation locus centering on the first shaft body 34. Even if it is going to move to, it will be in the state where a part of crevice rear end face 32a entered the rotation locus of the fin base 3 rear end, and movement of the fin base 3 rear end is controlled. In this manner, the fin F is fitted into the recess 11 without dropping from the board body B. In addition, by appropriately setting the distance between the front end surface 41a of the first groove 41 and the recess 44 of the second groove 42, the first shaft body 34 and the second shaft body are made to have a rubber layer 36 ( It is possible to press the front end surface 41a and the concave portion 44 with the deformation elastic force shown in FIG.

  When removing the fin F from the board main body B, if a rotational operation force of a certain level or more about the first shaft 34 is applied to the fin main body 2, the fin base 3 rear end and the recessed rear end surface 11c in contact with the fin base 3 are provided. Are pressed against each other and elastically deformed, and the second shaft body 35 moves eccentrically according to the pressing force from the convex portion 45 due to elastic deformation of the surrounding rubber layer 36, so that the second shaft body becomes the second groove. As shown in FIG. 3 (2), the fin base 3 is moved downward in the strip, and is rotated and detached downward from the inside of the recess 11 of the mounting member 1 with the first shaft body 34 as the center. As shown in FIG. 4 (1), this rotation is regulated by the regulation surface 31 a of the fin base 3 coming into contact with the bottom surface 11 b of the recess 11.

  In this state, the fin F is pushed upward along the first groove 41, and further, as shown in FIG. 4 (2), the regulation surface 31a is not brought into contact with the recess bottom surface 11b. The fin F is moved forward while guiding the first shaft body 34 to the third groove 43 so as to be parallel to the bottom surface 11b of the recess. Then, the first shaft body 34 is moved downward along the second groove 42 and extracted from the groove 42 (FIGS. 5A and 5B), and the fin F is separated from the board body B.

  When attaching the fin F to the board body B, the above process is reversed, and the first shaft body 34 is brought into contact with the front end surface 41a in the first groove 41, and the fin F is rotated upward about this. The rear end of the fin base 3 is pushed into the recess 11 so that the rear end of the fin base 3 is brought into contact with the rear end surface 11c of the recess, and at the same time, the second shaft body 35 is moved into the recess 44 of the second groove 42. To be located. Thereby, the fin base 3 is fitted into the recess 11 and the fin F is fixed to the board body B.

  When the board is in use, the surfer falls and touches the rear part of the fin F of the board body B, and when a rotation operation force of a certain level or more about the first shaft body 34 is applied to the fin body F, the fin F As shown in FIG. 4 (1), the board body B is quickly turned off. This avoids damage to the surfer body. In this case, since the restricting surface 31a contacts the bottom surface 11b of the recess 11, the fin F is prevented from moving forward, and the fin F is not separated from the board body B and lost.

  In the above embodiment, instead of embedding the mounting member 1 having the recess 11 in the board body B, the recess 11 may be directly formed in the board body B. Further, the structure for locking the first shaft body 34 and the second shaft body 35 is not necessarily limited to the groove. As the locking structure for the rear end of the fin base 3, only one of the contact with the recess rear end surface 11c and the second groove 42 can be employed. Further, it is not always necessary to adopt a structure in which the first groove 41 and the second groove 42 are communicated with each other by the third groove 43. The first shaft body is formed by extending the first groove 41 to the opening of the recess 11. It is good also as a structure which escapes 34 directly. Further, instead of the convex portion 45 of the second groove 42, a part of the second groove 42 may be deviated from the movement locus of the second shaft body 35 around the first shaft body 34. An effect is obtained.

It is the perspective view which looked at the fin attaching part in the state which made the fin remove | separate which shows one Embodiment of this invention from the bottom face side of the board main body. It is sectional drawing of the fin attaching part in the board main body bottom surface in the state which made the fin fit. It is sectional drawing of the fin attaching part which shows the process of removing a fin from a board main body. It is sectional drawing of the fin attaching part which shows the process of removing a fin from a board main body. It is sectional drawing of the fin attaching part which shows the process of removing a fin from a board main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mounting member, 11 ... Recess, 11c ... Rear end surface, 2 ... Fin main body, 3 ... Fin base part, 31 ... Front end part, 32 ... Rear end part, 34 ... 1st shaft body, 35 ... 2nd shaft body, 41 ... 1st groove, 41a ... Front end surface, 42 ... 2nd groove, 43 ... 3rd groove, B ... Board body, F ... Fin.

Claims (4)

A recess for inserting a fin base portion is formed in the board body of the surfboard, and a first shaft body is provided through the front end portion of the fin base portion so as to penetrate the fin base portion, and the front end of the fin base portion is provided in the recess portion In a state where the first shaft body is detachably and pivotably locked with only the portion fitted in the recess, the front end portion of the fin base portion is locked. A second locking portion that locks the rear end portion of the fin base, and the second locking portion is locked only by a rotational operation force that is greater than or equal to a predetermined value about the first shaft body. The fin base is set so that the rear end of the fin base can be removed from the recess, and a second shaft is provided through the rear end of the fin base, and the second shaft is provided. A locking portion is formed on both opposite side surfaces of the recess, and both ends of the second shaft body are fitted. Composed of groove line, the second groove provides that the first along with some exceptions in the movement locus of the second shaft around the shaft body, and the fin mounting surfboard that led to the opening of the recess Construction. 2. The surfboard according to claim 1, wherein the second locking portion is further configured by a rear end surface of the recess part of which has entered a rotation trajectory of a fin base rear end centered on the first shaft body. Fin mounting structure. The first locking portion is formed by a first groove that is formed on both opposing side surfaces of the recess and is fitted to both ends of the first shaft body provided at the front end portion of the fin base, The surfboard fin mounting structure according to claim 1 or 2, wherein a front end surface of the first groove is in contact with the first shaft body in a state in which the fin base portion is fitted in the recess. The surfboard fin mounting structure according to claim 3 , wherein the first groove and the second groove are communicated with each other by a third groove extending in the front-rear direction on the side surface of the recess.

Images