JP3189146U

JP3189146U - Surfboard fin fixing

Info

Publication number: JP3189146U
Application number: JP2013007000U
Authority: JP
Inventors: 勇平元; 忠平元
Original assignee: TETSUYA INC.
Current assignee: TETSUYA INC.
Filing date: 2013-12-10
Publication date: 2014-02-27
Anticipated expiration: 2023-12-10

Abstract

【課題】フィンの固定及び解除操作が確実にでき、フィンを固定する押圧力の調整が可能でフィンの固定状態を安定に維持できるサーフボード用フィン固定具を提供する。
【解決手段】軸方向の一端に把持部１ａを有し、中間箇所に小径部１ｃを有するネジ軸１と、ネジ軸１の把持部１ａ側の雄ネジ部１ｂに螺合した締付ナット２と、小径部１ｃに抜け止め保持されたワッシャー４と、締付ナット２とワッシャー４との間に配置されたバネ３と、一方向の幅がフィンボックスのフィン挿入用溝の幅よりも短く、一方向に直交する方向の幅がフィン挿入用溝の幅よりも長い外形を有し、中央に雌ネジ部５ａが形成された板ナット５とで構成され、板ナット５は、フィン挿入用溝の両側の壁に係合可能な一対の係合凸部５ｃ１を雌ネジ部５ａに対して長手方向の両側に有し、板ナット５の雌ネジ部５ａはネジ軸１の雄ネジ部１ｄが貫通しないようにネジ形成されている。
【選択図】図２Provided is a fin fixing tool for a surfboard that can reliably fix and release a fin, can adjust a pressing force for fixing the fin, and can stably maintain the fixed state of the fin.
A screw shaft 1 having a grip portion 1a at one end in an axial direction and a small diameter portion 1c at an intermediate portion, and a tightening nut 2 screwed into a male screw portion 1b on the grip portion 1a side of the screw shaft 1 are provided. And a washer 4 that is retained by the small-diameter portion 1c, a spring 3 disposed between the tightening nut 2 and the washer 4, and a width in one direction is shorter than the width of the fin insertion groove of the fin box. The plate nut 5 has an outer shape whose width in the direction orthogonal to one direction is longer than the width of the fin insertion groove, and is formed with a female screw portion 5a at the center. A pair of engaging projections 5c1 that can be engaged with the walls on both sides of the groove are provided on both sides in the longitudinal direction with respect to the female screw portion 5a, and the female screw portion 5a of the plate nut 5 is a male screw portion 1d of the screw shaft 1. The screw is formed so as not to penetrate.
[Selection] Figure 2

Description

本考案は、サーフボードに装着したフィンを固定するためのフィン固定具に関する。 The present invention relates to a fin fixing tool for fixing a fin mounted on a surfboard.

フィンはサーフボードの後方側の底面に固定される。フィンの種類・形状や取り付け位置を変えることにより、サーフボードの回転性が変化し、天候に合わせた操作性を調整することができるため、フィンを簡単に脱着し固定できることが望まれる。 The fin is fixed to the bottom surface on the rear side of the surfboard. By changing the fin type, shape, and mounting position, the surfboard's rotational properties can be changed and the operability can be adjusted according to the weather, so it is desirable that the fins can be easily detached and fixed.

図８〜図９を用いてサーフボードとサーフボード用フィンの構造について説明する。サーフボード用フィン１２は、根元部分１２ｃの一端部に両側面から左右に突き出た一対の脱落防止ピン１２ａを有し、他端部に固定具を取り付ける貫通孔１２ｂを有している。図９中、１２ｄはフィン本体を示す。サーフボード１０にはサーフボード用フィン１２を装着するフィンボックス１１が埋め込まれている。フィンボックス１１には、フィン１２の根元部分１２ｃを挿入する細長い形状のフィン挿入用溝１１ａが設けてあり、フィン挿入用溝１１ａの内部の左右両壁に横向きの係合溝１１ｂが設けてある。フィン挿入用溝１１ａの長手方向中央箇所にはフィン１２の脱落防止ピン１２ａを係合溝１１ｂに導入するためのピン導入溝１１ｃがフィン挿入用溝１１ａと直交するように設けてある。図８（ｂ）中、ｗはフィン挿入用溝１２ａの幅、ｗ４は左右の係合溝１１ｂの奥壁部の間の幅を示す。 The structure of the surfboard and the surfboard fin will be described with reference to FIGS. The surfboard fin 12 has a pair of dropout prevention pins 12a protruding left and right from both side surfaces at one end of the root portion 12c, and a through hole 12b for attaching a fixture to the other end. In FIG. 9, 12d shows a fin main body. The surfboard 10 is embedded with a fin box 11 in which surfboard fins 12 are mounted. The fin box 11 is provided with an elongated fin insertion groove 11a into which the root portion 12c of the fin 12 is inserted. Lateral engagement grooves 11b are provided on the left and right walls inside the fin insertion groove 11a. . A pin introduction groove 11c for introducing the drop-off prevention pin 12a of the fin 12 into the engagement groove 11b is provided at a central position in the longitudinal direction of the fin insertion groove 11a so as to be orthogonal to the fin insertion groove 11a. In FIG. 8B, w indicates the width of the fin insertion groove 12a, and w4 indicates the width between the back wall portions of the left and right engagement grooves 11b.

特許文献１には、簡単で確実にサーフボード用フィンを固定できることを目的として、一対の対角部をＲ形状とした長方形の板体と、板体の中央箇所に軸方向の一端が固定されたネジ軸と、雌ネジ部を有する樹脂製の締付ナットとから成るサーフボード用フィンの固定用具が開示されている。 In Patent Document 1, for the purpose of easily and surely fixing the fin for the surfboard, a rectangular plate having a pair of diagonal portions having an R shape, and one end in the axial direction are fixed to the central portion of the plate. A surfboard fin fixing tool including a screw shaft and a resin fastening nut having a female screw portion is disclosed.

上記サーフボード用フィンの固定用具の使用方法は以下の通りである。先ず、板体の長手方向をフィンの長手方向と平行にしてネジ軸をフィン本体の反対側からフィンの貫通孔に挿入し、貫通孔から突き出たネジ軸に締付ナットを締め込んで固定用具をフィンに仮止めする。次に、フィンの一端部の脱落防止ピンをフィンボックスのピン導入溝に挿入して係合溝に導入し、係合溝をスライドさせてフィンの前後方向の位置を決める。次に、固定用具をフィン挿入用溝に挿入した後、締付ナットを緩めてネジ軸を回転させて板体の長手方向をフィンの長手方向と交差させ、板体のＲ形状の対角部が係合溝の奥壁部に当接した状態で締付ナットを締め込む。これにより、板体が係合溝に係合されるとともに、板体に対してフィンが押し込まれ固定される。固定を解除する場合は、締付ナットを緩めて板体が係合溝に係合されない状態にする。 The method for using the surfboard fin fixing tool is as follows. First, with the longitudinal direction of the plate body parallel to the longitudinal direction of the fin, the screw shaft is inserted into the through hole of the fin from the opposite side of the fin body, and the fastening nut is tightened into the screw shaft protruding from the through hole. Temporarily fix to the fin. Next, a drop prevention pin at one end of the fin is inserted into the pin introduction groove of the fin box and introduced into the engagement groove, and the engagement groove is slid to determine the position of the fin in the front-rear direction. Next, after inserting the fixing tool into the fin insertion groove, loosen the tightening nut and rotate the screw shaft so that the longitudinal direction of the plate intersects the longitudinal direction of the fin, and the R-shaped diagonal portion of the plate Tighten the tightening nut in a state where the is in contact with the inner wall of the engaging groove. Accordingly, the plate body is engaged with the engagement groove, and the fins are pushed into the plate body and fixed. When releasing the fixation, the tightening nut is loosened so that the plate body is not engaged with the engaging groove.

特開２０１２−１２６３７２号公報JP 2012-126372 A

特許文献１に記載されたフィン固定具は、ネジ軸に螺合した締付ナットを回してネジ軸を回転させているためフィンの固定及び解除操作が確実にできない場合があり、また締付ナットがフィンを直接押圧して固定する構成であるため、フィンを固定する押圧力の調整が事実上不可能であるとともに、締付ナットが少しでも緩むと押圧力が低下し、フィンの固定が不安定になる可能性があった。 The fin fixing tool described in Patent Document 1 rotates the screw shaft by rotating the tightening nut screwed to the screw shaft, so that the fixing and releasing operation of the fin may not be surely performed. However, it is virtually impossible to adjust the pressing force to fix the fin, and if the tightening nut is loosened even a little, the pressing force will drop and the fin will not be fixed. There was a possibility of becoming stable.

本考案は、上述したような事情に鑑みてなされたものであり、フィンの固定及び解除操作が確実にでき、フィンを固定する押圧力の調整が可能であるとともに、フィンの固定状態を安定に維持することができるサーフボード用フィン固定具を提供することを目的とする。 The present invention has been made in view of the above-described circumstances. The fin can be fixed and released reliably, the pressing force for fixing the fin can be adjusted, and the fixed state of the fin can be stabilized. It is an object of the present invention to provide a surfboard fin fixture that can be maintained.

本考案に係るサーフボード用フィン固定具は、サーフボードの底面のフィンボックスに装着されたフィンを固定するためのサーフボード用フィン固定具であって、軸方向の一端に把持部を有し、軸方向の中間箇所に小径部を有するネジ軸と、前記ネジ軸の把持部側の雄ネジ部に螺合した締付ナットと、前記小径部に抜け止め状態に保持されたワッシャーと、前記締付ナットと前記ワッシャーとの間に配置されたバネと、平面視で一方向の幅が前記フィンボックスのフィン挿入用溝の幅よりも短く、一方向に直交する方向の幅が前記フィン挿入用溝の幅よりも長い外形を有し、中央箇所に前記ネジ軸の他端側の雄ネジ部が螺合可能な雌ネジ部が形成された板ナットとで構成され、前記板ナットは、長手方向が前記フィン挿入用溝と交差した配置で前記フィン挿入用溝に嵌り込んで溝の両側の壁に係合可能な一対の係合凸部を前記雌ネジ部に対して長手方向の両側に有し、前記板ナットの雌ネジ部又は前記ネジ軸の他端側の雄ネジ部は、前記ネジ軸の他端側の雄ネジ部が前記板ナットの雌ネジ部を貫通しないようにネジ形成されていることを特徴とする。 A surfboard fin fixing device according to the present invention is a surfboard fin fixing device for fixing a fin mounted on a fin box on a bottom surface of a surfboard, and has a grip portion at one end in an axial direction. A screw shaft having a small-diameter portion at an intermediate position, a tightening nut screwed into a male screw portion on the gripping portion side of the screw shaft, a washer held in a state of being prevented from coming off by the small-diameter portion, and the tightening nut; The spring disposed between the washer and the width in one direction in plan view is shorter than the width of the fin insertion groove of the fin box, and the width in the direction perpendicular to the one direction is the width of the fin insertion groove. A plate nut having a longer outer shape and having a female screw portion in which a male screw portion on the other end side of the screw shaft can be screwed at a central portion, and the plate nut has a longitudinal direction that is Placed across the fin insertion groove A pair of engaging projections that fit into the fin insertion groove and engage with the walls on both sides of the groove are provided on both sides in the longitudinal direction with respect to the female screw portion, and the female screw portion of the plate nut or the The male screw portion on the other end side of the screw shaft is formed so that the male screw portion on the other end side of the screw shaft does not penetrate the female screw portion of the plate nut.

本考案においては、軸方向の一端の把持部側の雄ネジ部に締付ナットが螺合し、軸方向の中間箇所の小径部にワッシャーが抜け止め状態に保持され、締付ナットとワッシャーとの間にバネが配置されたネジ軸の他端側の雄ネジ部をフィンの貫通孔に差し込み、貫通孔から突き出たネジ軸の雄ネジ部を板ナットの雌ネジ部に係合凸部が形成された側から螺合させる。板ナットの雌ネジ部に螺合したネジ軸の雄ネジ部は板ナットの雌ネジ部を貫通せず、ネジ軸の雄ネジ部が板ナットの雌ネジ部にネジ込まれた状態で板ナットがネジ軸に保持される。 In the present invention, a tightening nut is screwed into a male thread portion on the gripping portion side at one end in the axial direction, and a washer is retained in a small diameter portion at an intermediate position in the axial direction so that the tightening nut, washer, Insert the male threaded part on the other end of the screw shaft with the spring between them into the through hole of the fin, and insert the male threaded part of the screw shaft protruding from the through hole into the female threaded part of the plate nut. Screwed from the formed side. The male screw part of the screw shaft screwed into the female screw part of the plate nut does not penetrate the female screw part of the plate nut, and the male screw part of the screw shaft is screwed into the female screw part of the plate nut. Is held on the screw shaft.

次に、板ナットの長手方向をフィンボックスのフィン挿入用溝の長手方向と平行にしてフィン固定具をフィンと共にフィン挿入用溝に挿入した後、把持部を押してバネを圧縮させながらネジ軸を溝内部に押し込み、板ナットの係合凸部をフィン挿入用溝の内部の壁側の係合溝に対応する位置に下げる。そして板ナットの長手方向がフィンボックスのフィン挿入用溝の長手方向と交差するように把持部をネジ軸の雄ネジ部が板ナットの雌ネジ部にネジ込まれる方向と同じ方向に回してネジ軸を回転させた後、把持部を押していた力を緩める。すると、圧縮されていたバネの復元力でネジ軸が引き戻され、板ナットの一対の係合凸部がフィン挿入用溝に嵌まり込んで溝の両側の内壁に係合可能になるとともに、係合溝内に位置する板ナットの部分が係合溝の上壁に当接し、フィンがワッシャーを介してバネで板ナット側に押し付けられてフィンボックスに固定される。ここで、締付ナットを締めることによりバネが圧縮され、フィンを固定する押圧力が調整できる。また、板ナットが回転しようとしても、係合凸部がフィン挿入用溝の両側の壁に係合して回転が制限されるので、板ナットの長手方向がフィンボックスのフィン挿入用溝の長手方向と交差する状態が維持され、フィンの固定状態が安定に維持される。 Next, with the longitudinal direction of the plate nut parallel to the longitudinal direction of the fin insertion groove of the fin box, the fin fixing tool is inserted into the fin insertion groove together with the fin, and then the screw shaft is pressed while pressing the gripping portion to compress the spring. The groove is pushed into the groove, and the engagement protrusion of the plate nut is lowered to a position corresponding to the engagement groove on the wall side inside the fin insertion groove. Then, rotate the gripping part in the same direction as the direction in which the male screw part of the screw shaft is screwed into the female screw part of the plate nut so that the longitudinal direction of the plate nut intersects the longitudinal direction of the fin insertion groove of the fin box. After rotating the shaft, release the force that was pushing the grip. Then, the screw shaft is pulled back by the restoring force of the compressed spring, and the pair of engaging projections of the plate nut is fitted into the fin insertion groove so that it can be engaged with the inner walls on both sides of the groove. A portion of the plate nut positioned in the mating groove abuts on the upper wall of the engagement groove, and the fin is pressed against the plate nut side by a spring through a washer and fixed to the fin box. Here, the spring is compressed by tightening the tightening nut, and the pressing force for fixing the fin can be adjusted. Also, even if the plate nut tries to rotate, the engagement protrusions engage with the walls on both sides of the fin insertion groove so that the rotation is restricted, so the longitudinal direction of the plate nut is the length of the fin insertion groove of the fin box. The state intersecting with the direction is maintained, and the fixed state of the fin is stably maintained.

フィンの固定状態を解除する場合は、把持部を押してバネを圧縮させながらネジ軸を溝内部に押し込み、板ナットの係合凸部をフィン挿入用溝の内部の係合溝に対応する位置に下げ、板ナットの長手方向がフィンボックスのフィン挿入用溝の長手方向と平行になるまで把持部を固定操作の場合と同じ方向に回してネジ軸を回転させた後、把持部を押していた力を緩めると、圧縮されていたバネの復元力でネジ軸が引き戻され、板ナットの全体がフィン挿入用溝内に位置し、フィンの固定が解除される。従って、把持部を押しながら一方向に回した後、把持部の押し操作を停止することを繰り返すことにより、フィンの固定状態と解除状態に切り替わるので、フィンの固定及び解除操作が確実にできる。 To release the fixed state of the fin, push the gripping part to compress the spring, push the screw shaft into the groove, and move the engagement protrusion of the plate nut to the position corresponding to the engagement groove inside the fin insertion groove. The force that pushed the gripping part after rotating the screw shaft by rotating the gripping part in the same direction as in the fixing operation until the longitudinal direction of the plate nut is parallel to the longitudinal direction of the fin insertion groove of the fin box When the screw is loosened, the screw shaft is pulled back by the restoring force of the compressed spring, the entire plate nut is positioned in the fin insertion groove, and the fixing of the fin is released. Accordingly, by repeatedly turning the gripping portion while pressing the gripping portion and then stopping the pressing operation of the gripping portion, the fin is fixed and released, so that the fin can be fixed and released reliably.

さらに本考案に係るサーフボード用フィン固定具は、前記把持部と前記締付ナットとが前記ネジ軸の軸方向に対して同心の円柱状に形成してあることを特徴とする。
本考案においては、把持部と締付ナットとが円柱状であって回転操作がし易いとともに、指の位置をネジ軸の軸方向に少しずらすだけで把持部の操作と締付ナットの操作とを素早く切り替えることができるので、操作性が向上する。 Furthermore, the fin fixing tool for a surfboard according to the present invention is characterized in that the grip portion and the tightening nut are formed in a cylindrical shape concentric with the axial direction of the screw shaft.
In the present invention, the gripping portion and the tightening nut are columnar and easy to rotate, and the gripping portion and the tightening nut can be operated only by slightly shifting the finger position in the axial direction of the screw shaft. Can be switched quickly, improving operability.

さらに本考案に係るサーフボード用フィン固定具は、前記バネは、前記ネジ軸の把持部側の雄ネジ部を内部に位置させたコイルバネであり、前記ネジ軸の把持部側の雄ネジ部のネジ径が他端側の雄ネジ部のネジ径よりも大であることを特徴とする。 Furthermore, in the fin fixing tool for a surfboard according to the present invention, the spring is a coil spring in which a male screw portion on the gripping portion side of the screw shaft is located inside, and the screw of the male screw portion on the gripping portion side of the screw shaft. The diameter is larger than the screw diameter of the male screw portion on the other end side.

本考案においては、バネ力を強くするためにコイルバネの径を大きくした場合、コイルバネの内部に位置したネジ軸の把持部側の雄ネジ部のネジ径を大きくして、コイルバネの倒れを防止して安定に保持できるようにしながら、他端側の雄ネジ部のネジ径を大きくできないフィン側の貫通孔などの状況に適切に対応することができる。 In the present invention, when the diameter of the coil spring is increased in order to increase the spring force, the screw diameter of the male screw portion on the gripping portion side of the screw shaft located inside the coil spring is increased to prevent the coil spring from falling down. Thus, it is possible to appropriately cope with a situation such as a through hole on the fin side in which the screw diameter of the male screw portion on the other end side cannot be increased.

さらに本考案に係るサーフボード用フィン固定具は、前記板ナットは、長手方向の周縁部が雌ネジ部の軸心を中心とした円弧状に形成してあることを特徴とする。
本考案においては、板ナットが雌ネジ部の軸心回りに回転する場合に、長手方向の周縁部は雌ネジ部の軸心を中心とした円弧より外側に出ないので、板ナットの長手方向がフィン挿入用溝の長手方向と交差した状態で板ナットの周縁部を係合溝の奥壁部に接近させて板ナットの係合溝に対する当接面積を大きくして安定に係合させることができる。 Furthermore, the fin fixing tool for a surfboard according to the present invention is characterized in that the plate nut is formed in a circular arc shape with the peripheral edge portion in the longitudinal direction centering on the axis of the female screw portion.
In the present invention, when the plate nut rotates around the axis of the female screw portion, the peripheral edge in the longitudinal direction does not protrude outside the arc centered on the axis of the female screw portion. In the state where the longitudinal direction of the fin insertion groove crosses, the peripheral edge of the plate nut is brought close to the inner wall of the engagement groove to increase the contact area of the plate nut with the engagement groove and to stably engage the plate nut. Can do.

本考案によれば、フィンの固定及び解除操作が確実にでき、フィンを固定する押圧力の調整が可能であるとともに、フィンの固定状態を安定に維持することができるサーフボード用フィン固定具が提供される。 According to the present invention, there is provided a fin fixing device for a surfboard capable of reliably fixing and releasing the fin, adjusting the pressing force for fixing the fin, and maintaining the fixed state of the fin stably. Is done.

本考案に係るサーフボード用フィン固定具の正面図である。It is a front view of the fin fixing tool for surfboards concerning this invention. 本考案に係るサーフボード用フィン固定具の分解斜視図である。It is a disassembled perspective view of the fin fixing tool for surfboards concerning this invention. 本考案に係るサーフボード用フィン固定具の構成部品の正面図である。It is a front view of the component of the fin fixing tool for surfboards concerning this invention. 本考案に係るサーフボード用フィン固定具の構成部品の正面図、底面図、断面図である。It is the front view, bottom view, and sectional view of the component parts of the fin fixing tool for surfboards concerning this invention. 本考案に係るサーフボード用フィン固定具の構成部品の正面図、平面図である。It is the front view and top view of the component of the fin fixing tool for surfboards which concern on this invention. 本考案に係るサーフボード用フィン固定具の構成部品の正面図、平面図、断面図である。It is the front view of the component of the fin fixing tool for surfboards concerning this invention, a top view, and sectional drawing. 本考案に係るサーフボード用フィン固定具の構成部品の正面図、平面図、断面図である。It is the front view of the component of the fin fixing tool for surfboards concerning this invention, a top view, and sectional drawing. サーフボードの底面の斜視図とフィンボックスの断面図である。It is the perspective view of the bottom face of a surfboard, and sectional drawing of a fin box. サーフボード用フィンの斜視図である。It is a perspective view of the fin for surfboards. 本考案に係るサーフボード用フィン固定具をフィンに取り付けた状態を示す図である。It is a figure which shows the state which attached the fin fixing tool for surfboards which concerns on this invention to the fin. フィンをサーフボードに装着する状態を示す図である。It is a figure which shows the state which mounts | wears a surfboard with a fin. フィンをフィンボックスに固定及び固定解除する状態を示す断面図である。It is sectional drawing which shows the state which fixes and unfixes a fin to a fin box. フィンをフィンボックスに固定及び固定解除する状態を示す平面図である。It is a top view which shows the state which fixes and unfixes a fin to a fin box. 本考案に係るサーフボード用フィン固定具の別の実施形態を示す正面図である。It is a front view which shows another embodiment of the fin fixing tool for surfboards which concerns on this invention. 本考案に係るサーフボード用フィン固定具の別の実施形態を示す正面図である。It is a front view which shows another embodiment of the fin fixing tool for surfboards which concerns on this invention.

以下、本考案に係るサーフボード用フィン固定具の実施形態について説明する。図１〜図２は本考案に係るサーフボード用フィン固定具の全体を示す図、図３〜図７は本考案に係るサーフボード用フィン固定具の構成部品を示す図である。尚、図４（ｃ）は図４（ｂ）のＡ−Ａ位置での断面を示し、図６（ｃ）は図６（ｂ）のＢ−Ｂ位置での断面を示し、図７（ｃ）は図７（ｂ）のＣ−Ｃ位置での断面を示す。 Hereinafter, an embodiment of a fin fixing tool for a surfboard according to the present invention will be described. 1 to 2 are views showing the entire surfboard fin fixing device according to the present invention, and FIGS. 3 to 7 are views showing components of the surfboard fin fixing device according to the present invention. 4C shows a cross section at the position AA in FIG. 4B, FIG. 6C shows a cross section at the position BB in FIG. 6B, and FIG. ) Shows a cross section taken along the line CC in FIG.

本考案に係るサーフボード用フィン固定具は、軸方向の一端にボルト頭１ａ（把持部に相当する）を有し、軸方向の中間箇所に小径部１ｃを有し、ボルト頭１ａ側の雄ネジ部１ｂのネジ径が先端側の雄ネジ部１ｄのネジ径よりも大であるボルト１（ネジ軸に相当する）と、ボルト１のボルト頭１ａ側の雄ネジ部１ｂに螺合した締付ナット２と、ボルト１の小径部１ｃに遊嵌され、抜け止め状態に保持された円形のワッシャー４と、締付ナット２とワッシャー４との間に配置されたコイルバネ３と、中央箇所にボルト１の先端側の雄ネジ部１ｄが螺合可能な雌ネジ部５ａを有する板ナット５とで構成される。ボルト頭１ａ側の雄ネジ部１ｂのネジ径はＭ５であり、先端側の雄ネジ部１ｄのネジ径はＭ４である。ボルト１、締付ナット２、ワッシャー４及び板ナット５の材質はＳＵＳ３０４、コイルバネ３の材質はＳＵＳ３０４バネ鋼である。 The fin fixing tool for a surfboard according to the present invention has a bolt head 1a (corresponding to a grip portion) at one end in the axial direction, a small diameter portion 1c at an intermediate position in the axial direction, and a male screw on the bolt head 1a side. A bolt 1 (corresponding to a screw shaft) in which the screw diameter of the portion 1b is larger than the screw diameter of the male screw portion 1d on the distal end side, and a tightening screwed to the male screw portion 1b on the bolt head 1a side of the bolt 1 A nut 2, a circular washer 4 loosely fitted to the small diameter portion 1 c of the bolt 1 and held in a state of being prevented from being detached, a coil spring 3 disposed between the tightening nut 2 and the washer 4, and a bolt at the center And a plate nut 5 having a female screw portion 5a to which a male screw portion 1d on the front end side of 1 can be screwed. The screw diameter of the male screw portion 1b on the bolt head 1a side is M5, and the screw diameter of the male screw portion 1d on the tip side is M4. The material of the bolt 1, the tightening nut 2, the washer 4 and the plate nut 5 is SUS304, and the material of the coil spring 3 is SUS304 spring steel.

ボルト頭１ａと締付ナット２とがボルト１の軸方向に対して同心の円柱状に形成されている。ボルト頭１ａの側から伸ばした指で摘み易いように、締付ナット２の外径がボルト頭１ａの外径よりも大きく形成されている。ボルト頭１ａ及び締付ナット２の外周面には、指で摘んで回転操作するときに滑り難くするために細かい縦溝が刻まれている。また、ボルト頭１ａの表面にはネジ込み方向を示す矢印が彫りこまれ（図２）、注意を引くために矢印には赤ペイントが塗装されている。 The bolt head 1 a and the tightening nut 2 are formed in a cylindrical shape concentric with the axial direction of the bolt 1. The outer diameter of the tightening nut 2 is formed larger than the outer diameter of the bolt head 1a so that it can be easily picked with a finger extended from the bolt head 1a side. On the outer peripheral surfaces of the bolt head 1a and the tightening nut 2, fine vertical grooves are engraved to make it difficult to slip when being picked with a finger and rotated. Further, an arrow indicating the screwing direction is engraved on the surface of the bolt head 1a (FIG. 2), and red paint is painted on the arrow to draw attention.

ワッシャー４をボルト１の小径部１ｃに抜け止め状態に保持させ、締付ナット２とワッシャー４との間にコイルバネ３を配置する構成について説明する。ワッシャー４の内側の孔４ａの孔径は小径部１ｃの外径よりも僅かに大きい寸法にしてある。ボルト１はボルト頭１ａ側の雄ネジ部１ｂだけをネジ加工し、残りは小径部１ｃの径と同径にしてある。この状態でボルト１の先端側から締付ナット２を通してボルト頭１ａ側の雄ネジ部１ｂに螺合させ、次にコイルバネ３を通し、最後にワッシャー４を通す。その後、ボルト１の先端側から雄ネジ部１ｄを鍛造により形成すると、鍛造で盛り上がった雄ネジ部１ｄの外径がワッシャー４の内側の孔４ａの孔径よりも大きくなるので、ワッシャー４は小径部１ｃに抜け止め状態に保持される。また、ボルト１のボルト頭１ａ側の雄ネジ部１ｂがコイルバネ３の内部に位置している。 A configuration in which the washer 4 is held in the small diameter portion 1c of the bolt 1 in a retaining state and the coil spring 3 is disposed between the tightening nut 2 and the washer 4 will be described. The hole diameter of the inner hole 4a of the washer 4 is slightly larger than the outer diameter of the small diameter portion 1c. The bolt 1 is formed by screwing only the male screw portion 1b on the bolt head 1a side, and the rest has the same diameter as that of the small diameter portion 1c. In this state, the bolt 1 is screwed into the male screw portion 1b on the bolt head 1a side through the tightening nut 2 from the tip side, then the coil spring 3 is passed, and the washer 4 is finally passed. Thereafter, when the male screw portion 1d is formed by forging from the front end side of the bolt 1, the outer diameter of the male screw portion 1d raised by forging becomes larger than the hole diameter of the inner hole 4a of the washer 4, so that the washer 4 has a smaller diameter portion. 1c is held in a retaining state. Further, the male screw portion 1 b on the bolt head 1 a side of the bolt 1 is located inside the coil spring 3.

コイルバネ３の軸方向の両端部３ａは軸方向に直交する平面上に位置している。締付ナット２のコイルバネ３に面する側には、コイルバネ３のコイル外径よりも僅かに大きい内径と所定の深さを有する凹状のコイル受け部２ｂが設けられ、ワッシャー４のコイルバネ３に面する側には、コイルバネ３のコイル外径よりも僅かに大きい内径と所定の深さを有する凹状のコイル受け部４ｂが設けてある。締付ナット２とワッシャー４との間に位置したコイルバネ３の両端部３ａは夫々締付ナット２のコイル受け部２ｂとワッシャー４のコイル受け部４ｂとによって安定に受け止め保持される。 Both end portions 3a in the axial direction of the coil spring 3 are located on a plane orthogonal to the axial direction. On the side of the tightening nut 2 facing the coil spring 3, a concave coil receiving portion 2 b having an inner diameter slightly larger than the coil outer diameter of the coil spring 3 and a predetermined depth is provided, and the coil spring 3 of the washer 4 faces the coil spring 3. A concave coil receiving portion 4b having an inner diameter slightly larger than the outer diameter of the coil spring 3 and a predetermined depth is provided on the side to be coiled. Both end portions 3 a of the coil spring 3 positioned between the tightening nut 2 and the washer 4 are stably received and held by the coil receiving portion 2 b of the tightening nut 2 and the coil receiving portion 4 b of the washer 4.

板ナット５は、平面視で一方向の幅ｗ１がフィンボックス１１のフィン挿入用溝１１ａの幅ｗ（図８参照）よりも短く、一方向に直交する方向の幅ｗ２がフィン挿入用溝１１ａの幅ｗよりも長い外形を有している。板ナット５の中央には、一方の幅が板ナット５の短い方の外形幅ｗ１と同幅であり、他方の幅がｗ１より長いがフィンボックス１１のフィン挿入用溝１１ａの幅ｗより少し短い幅ｗ３の矩形で面状に突出した面状突出部５ｃが形成されている。板ナット５の長手方向で面状突出部５ｃの両側に面状突出部５ｃより低い高さのナット平面部５ｅが形成されている。図７において、５ｃ１は面状突出部５ｃの長手方向の両側面部を示す。 The plate nut 5 has a width w1 in one direction shorter than a width w (see FIG. 8) of the fin insertion groove 11a of the fin box 11 in plan view, and a width w2 in a direction orthogonal to the one direction is a fin insertion groove 11a. The outer shape is longer than the width w. At the center of the plate nut 5, one width is the same as the shorter outer width w1 of the plate nut 5, and the other width is longer than w1, but slightly smaller than the width w of the fin insertion groove 11a of the fin box 11. A planar projecting portion 5c that is a rectangular shape having a short width w3 and that projects in a planar shape is formed. A nut flat surface portion 5e having a height lower than that of the planar protrusion 5c is formed on both sides of the planar protrusion 5c in the longitudinal direction of the plate nut 5. In FIG. 7, 5c1 shows the both side surface parts of the longitudinal direction of the planar protrusion part 5c.

板ナット５の中央箇所には、面状突出部５ｃの側からボルト１の先端側の雄ネジ部１ｄが螺合可能な雌ネジ部５ａが形成されている。ただし、雌ネジ部５ａは板ナット５を貫通せず、面状突出部５ｃの反対側にはネジが形成されていない内周部５ｂが残っている。そのため、ボルト１の雄ネジ部１ｄが板ナット５の雌ネジ部５ａにネジ込まれたとき雄ネジ部１ｄの先端が内周部５ｂに当たった位置でネジ込みが停止する。従って、板ナット５の雌ネジ部５ａは、ボルト１の先端側の雄ネジ部１ｄが板ナット５の雌ネジ部５ａを貫通しないようにネジ形成されている。板ナット５の長手方向の周縁部５ｄは雌ネジ部５ａの軸心を中心とした半径Ｒの円弧状に形成されている。 A female screw portion 5a is formed at the center of the plate nut 5 so that the male screw portion 1d on the tip side of the bolt 1 can be screwed from the planar protruding portion 5c side. However, the female screw portion 5a does not penetrate the plate nut 5, and the inner peripheral portion 5b where no screw is formed remains on the opposite side of the planar protrusion 5c. Therefore, when the male screw part 1d of the bolt 1 is screwed into the female screw part 5a of the plate nut 5, the screwing stops at a position where the tip of the male screw part 1d hits the inner peripheral part 5b. Accordingly, the female screw portion 5 a of the plate nut 5 is formed so that the male screw portion 1 d on the tip side of the bolt 1 does not penetrate the female screw portion 5 a of the plate nut 5. A peripheral edge portion 5d in the longitudinal direction of the plate nut 5 is formed in an arc shape having a radius R with the axial center of the female screw portion 5a as the center.

次に、本考案に係るサーフボード用フィン固定具の使用方法について説明する。図１０は本考案に係るサーフボード用フィン固定具をフィンに取り付けた状態を示す図、図１１はフィンをサーフボードに装着する状態を示す図、図１２及び図１３はフィンをフィンボックスに固定及び固定解除する状態を示す図である。 Next, a method for using the surfboard fin fixture according to the present invention will be described. 10 is a view showing a state where the fin fixing tool for a surfboard according to the present invention is attached to the fin, FIG. 11 is a view showing a state where the fin is attached to the surfboard, and FIGS. 12 and 13 are fixed and fixed to the fin box. It is a figure which shows the state to cancel | release.

先ず、本考案に係るサーフボード用フィン固定具をフィン１２に取り付ける操作を説明する。ボルト１から板ナット５を外し、締付ナット２を緩めた状態でボルト１の先端側の雄ネジ部１ｄをフィン１２の根元部分１２ｃの貫通孔１２ｂにフィン本体１２ｄの方から差し込む。そして、貫通孔１２ｂの反対側に突き出た雄ネジ部１ｄが板ナット５の雌ネジ部５ａにネジ込まれるようにボルト頭１ａを矢印方向（右向き）に回す。雄ネジ部１ｄが板ナット５の内周部５ｂに当たった位置でネジ込みは停止するので、その位置でボルト頭１ａを軽く締めることにより、ボルト１に板ナット５が保持される（このとき、図１に示すようにボルト１の先端部は板ナット５の底面と略面一に位置している）。 First, an operation of attaching the surfboard fin fixing device according to the present invention to the fins 12 will be described. With the plate nut 5 removed from the bolt 1 and the tightening nut 2 loosened, the male screw portion 1d on the tip side of the bolt 1 is inserted into the through hole 12b of the root portion 12c of the fin 12 from the fin body 12d. Then, the bolt head 1a is turned in the arrow direction (rightward) so that the male screw portion 1d protruding to the opposite side of the through hole 12b is screwed into the female screw portion 5a of the plate nut 5. Since the screwing stops at the position where the male screw portion 1d hits the inner peripheral portion 5b of the plate nut 5, the plate nut 5 is held on the bolt 1 by lightly tightening the bolt head 1a at that position (at this time) As shown in FIG. 1, the tip of the bolt 1 is positioned substantially flush with the bottom surface of the plate nut 5).

次に本考案に係るサーフボード用フィン固定具が取り付けられたフィン１２をサーフボード１０に装着する操作を説明する。基本的には図１１に示すように従来と同様である。フィン１２側の脱落防止ピン１２ａをフィンボックス１１のピン導入溝１１ｃに挿入して係合溝１１ｂに導入し、係合溝１１ｂ内をスライドさせてフィン１２の前後方向の位置を決めた後、板ナット５の長手方向をフィン１２の長手方向と平行にした状態でフィン１２の根元部分１２ｃの全体をフィン挿入用溝１１ａに挿入する。このとき、板ナット５の面状突出部５ｃは係合溝１１ｂより上側に位置している（図１２（ａ）の実線部参照）。 Next, an operation of attaching the fin 12 to which the surfboard fin fixing device according to the present invention is attached to the surfboard 10 will be described. Basically, it is the same as the conventional one as shown in FIG. After the fin 12 side drop prevention pin 12a is inserted into the pin introduction groove 11c of the fin box 11 and introduced into the engagement groove 11b, the inside of the engagement groove 11b is slid to determine the position of the fin 12 in the front-rear direction. The entire root portion 12c of the fin 12 is inserted into the fin insertion groove 11a in a state where the longitudinal direction of the plate nut 5 is parallel to the longitudinal direction of the fin 12. At this time, the planar protrusion 5c of the plate nut 5 is positioned above the engagement groove 11b (see the solid line portion in FIG. 12A).

次に図１２及び図１３に基づいてフィン１２をフィンボックス１１に固定する操作を説明する。先ず、ボルト頭１ａを押して（このときコイルバネ３は圧縮される）、板ナット５の面状突出部５ｃを係合溝１１ｂの位置まで下げた状態で（図１２（ａ）の点線部、図１３（ａ）の実線部）、ボルト頭１ａを矢印方向（右向き）に回す（図１２（ｂ）、図１３（ａ）の点線部）。ボルト頭１ａを約９０度回転させると、板ナット５の長手方向がフィン挿入用溝１１ａに直交する状態になり（図１２（ｃ）の点線部）、この位置でボルト頭１ａを押していた力を緩めると、コイルバネ３の戻り力で板ナット５が引き上げられ、面状突出部５ｃがフィン挿入用溝１１ａに嵌まり込むとともに面状突出部５ｃの両側のナット平面部５ｅが係合溝１１ｂの上壁に当接し、フィン１２がフィンボックス１１に固定される（図１２（ｃ）の実線部、図１３（ｂ）の実線部）。最後に締付ナット２を締めてコイルバネ３を圧縮させ、フィン１２を押圧する固定力を調整する。 Next, an operation of fixing the fin 12 to the fin box 11 will be described with reference to FIGS. First, the bolt head 1a is pushed (at this time, the coil spring 3 is compressed), and the planar protrusion 5c of the plate nut 5 is lowered to the position of the engagement groove 11b (the dotted line portion in FIG. 13 (a), the solid line portion), and the bolt head 1a is turned in the direction of the arrow (rightward) (FIG. 12 (b), dotted line portion in FIG. 13 (a)). When the bolt head 1a is rotated about 90 degrees, the longitudinal direction of the plate nut 5 is perpendicular to the fin insertion groove 11a (dotted line portion in FIG. 12C), and the force that has pushed the bolt head 1a at this position. Is loosened, the plate nut 5 is pulled up by the return force of the coil spring 3, the planar protrusion 5c is fitted into the fin insertion groove 11a, and the nut flat portions 5e on both sides of the planar protrusion 5c are engaged grooves 11b. The fin 12 is fixed to the fin box 11 (solid line part in FIG. 12C, solid line part in FIG. 13B). Finally, the tightening nut 2 is tightened to compress the coil spring 3, and the fixing force for pressing the fin 12 is adjusted.

上記の面状突出部５ｃがフィン挿入用溝１１ａに嵌まり込んでいる状態では、面状突出部５ｃの両側面部５ｃ１は幅ｗのフィン挿入用溝１１ａの両側の壁に短い距離で対向しているため、板ナット５がフィン挿入用溝１１ａ内で回転しようとしても、両側面部５ｃ１がフィン挿入用溝１１ａの壁に係合して回転が阻止される。従って、面状突出部５ｃの両側面部５ｃ１が、雌ネジ部５ａに対して長手方向の両側に位置し、板ナット５の長手方向がフィン挿入用溝１１ａと交差した配置でフィン挿入用溝１１ａに嵌り込んで溝の両側の壁に係合可能な一対の係合凸部に対応する。 In a state in which the planar protrusion 5c is fitted in the fin insertion groove 11a, both side surfaces 5c1 of the planar protrusion 5c face the walls on both sides of the fin insertion groove 11a having a width w at a short distance. Therefore, even if the plate nut 5 tries to rotate in the fin insertion groove 11a, the both side surface portions 5c1 engage with the wall of the fin insertion groove 11a to prevent the rotation. Accordingly, the side surface portions 5c1 of the planar protrusion 5c are located on both sides in the longitudinal direction with respect to the female screw portion 5a, and the fin insertion groove 11a is arranged so that the longitudinal direction of the plate nut 5 intersects the fin insertion groove 11a. It corresponds to a pair of engaging projections that can be engaged with the walls on both sides of the groove.

次にフィンボックス１１に固定したフィン１２の固定を解除する操作を説明する。先ず、ボルト頭１ａを押して（このときコイルバネ３は圧縮される）、板ナット５の面状突出部５ｃを係合溝１１ｂの位置まで下げ（図１２（ｃ）の点線部）、ボルト頭１ａを矢印方向（右向き）に回す（図１２（ｄ）、図１３（ｂ）の点線部）。ボルト頭１ａを約９０度回転させると、板ナット５の長手方向がフィン挿入用溝１１ａと平行な状態になり（図１２（ａ）の点線部）、この位置でボルト頭１ａを押していた力を緩めると、コイルバネ３の戻り力で板ナット５が引き上げられ、板ナット５の全体がフィン挿入用溝１１ａ内に位置し、フィン１２の固定が解除される（図１２（ａ）の実線部、図１３（ａ）の実線部）。従って、ボルト頭１ａを押しながら右方向に約９０度回した後、ボルト頭１ａの押し操作を停止することを繰り返すことにより、フィン１２の固定状態と解除状態とが切り替えられる。 Next, an operation for releasing the fixation of the fin 12 fixed to the fin box 11 will be described. First, the bolt head 1a is pushed (at this time, the coil spring 3 is compressed), and the planar protrusion 5c of the plate nut 5 is lowered to the position of the engaging groove 11b (dotted line portion in FIG. 12C), and the bolt head 1a. Is turned in the direction of the arrow (rightward) (dotted line portion in FIGS. 12D and 13B). When the bolt head 1a is rotated about 90 degrees, the longitudinal direction of the plate nut 5 is in parallel with the fin insertion groove 11a (dotted line portion in FIG. 12A), and the force that has pushed the bolt head 1a at this position. Is loosened, the plate nut 5 is pulled up by the return force of the coil spring 3, the entire plate nut 5 is located in the fin insertion groove 11a, and the fixing of the fin 12 is released (the solid line portion in FIG. 12A). , Solid line portion in FIG. Therefore, after the bolt head 1a is pressed and turned about 90 degrees to the right, the pushing operation of the bolt head 1a is repeatedly stopped, so that the fixed state and the released state of the fin 12 are switched.

また図１３に示すように、板ナット５が雌ネジ部５ａの軸心回りに回転する場合に、板ナット５の長手方向の周縁部５ｄは雌ネジ部５ａの軸心を中心とした円弧より外側に出ない。そこで、板ナット５の長手方向がフィン挿入用溝１１ａの長手方向と交差した状態で板ナット５の周縁部５ｄが左右の係合溝１１ｂの奥壁部に接近するように、板ナット５の長手方向の幅ｗ２を左右の係合溝１１ｂの奥壁部の間の幅ｗ４より少し短い程度の寸法にしておく。これにより、板ナット５の長手方向両側のナット平面部５ｅが係合溝１１ｂに当接するときの当接面積が大きくなり、安定に係合される。 Further, as shown in FIG. 13, when the plate nut 5 rotates around the axis of the female screw portion 5a, the peripheral edge portion 5d of the plate nut 5 is formed by an arc centered on the axis of the female screw portion 5a. Do not go outside. Therefore, in the state where the longitudinal direction of the plate nut 5 intersects the longitudinal direction of the fin insertion groove 11a, the peripheral portion 5d of the plate nut 5 approaches the back wall portions of the left and right engaging grooves 11b. The width w2 in the longitudinal direction is set to a dimension slightly shorter than the width w4 between the back wall portions of the left and right engaging grooves 11b. As a result, the contact area when the nut flat portions 5e on both sides in the longitudinal direction of the plate nut 5 are in contact with the engagement groove 11b is increased, and the plate nut 5 is stably engaged.

上記実施形態では、板ナット５の雌ネジ部５ａをボルト１の先端側の雄ネジ部１ｄが貫通しないようにネジ形成したが、これに限るものではない。図１４に示すように、ボルト１の先端側の雄ネジ部１ｄを板ナット５の雌ネジ部５ａに貫通しないようにネジ形成してもよい。具体的には、ボルト１の先端側の雄ネジ部１ｄの軸方向の長さを板ナット５の厚さ程度に短く形成し、残りは円柱部１ｅのままにしておく（この場合、板ナット５は、内周部５ｂを設けず、雌ネジ部５ａを貫通形成しておく）。この構成で、ボルト１の雄ネジ部１ｄを板ナット５の雌ネジ部５ａにネジ込んだときボルト１の円柱部１ｅが雌ネジ部５ａに達した位置でネジ込みが停止する。尚、図１４では、ワッシャー４を小径部１ｃに抜け止め状態に保持するために雄ネジ部１ｆを鍛造形成している。 In the above-described embodiment, the female screw portion 5a of the plate nut 5 is threaded so that the male screw portion 1d on the tip end side of the bolt 1 does not penetrate, but the present invention is not limited to this. As shown in FIG. 14, a screw may be formed so that the male screw portion 1 d on the tip side of the bolt 1 does not penetrate the female screw portion 5 a of the plate nut 5. Specifically, the axial length of the male screw portion 1d on the tip end side of the bolt 1 is formed to be as short as the thickness of the plate nut 5, and the rest is left as the column portion 1e (in this case, the plate nut) 5 does not provide the inner peripheral portion 5b, and penetrates the female screw portion 5a). With this configuration, when the male screw portion 1d of the bolt 1 is screwed into the female screw portion 5a of the plate nut 5, the screwing stops at the position where the cylindrical portion 1e of the bolt 1 reaches the female screw portion 5a. In FIG. 14, the male screw portion 1f is formed by forging in order to hold the washer 4 in the small diameter portion 1c so as not to come off.

上記実施形態では、一対の係合凸部を面状突出部５ｃの両側面部５ｃ１で構成したが、これに限るものではない。図１５に示すように、面状突出部５ｃの代わりに、面状突出部５ｃの両端部分に相当する一対の突起部５ｆを設け、その両突起部５ｆの雌ネジ部５ａの側とは反対の両側面部５ｆ１で一対の係合凸部を構成してもよい。 In the above embodiment, the pair of engaging convex portions is configured by the both side surface portions 5c1 of the planar protrusion 5c, but the present invention is not limited to this. As shown in FIG. 15, instead of the planar protrusion 5c, a pair of protrusions 5f corresponding to both end portions of the planar protrusion 5c are provided, and both protrusions 5f are opposite to the female screw 5a side. A pair of engaging convex portions may be formed by the both side surface portions 5f1.

上述した実施形態は本考案の一態様であり、該記載により本考案が限定されるものではなく、本考案の作用効果が奏される範囲で適宜変更可能であることはいうまでもない。 The above-described embodiment is an aspect of the present invention, and the present invention is not limited to the description. Needless to say, the embodiment can be appropriately changed within a range where the effects of the present invention are exhibited.

１ボルト（ネジ軸）
１ａボルト頭（把持部）
１ｂ雄ネジ部
１ｃ小径部
１ｄ雄ネジ部
２締付ナット
２ａ雌ネジ部
３コイルバネ（バネ）
４ワッシャー
５板ナット
５ａ雌ネジ部
５ｃ１側面部（係合凸部）
５ｄ周縁部
５ｆ１側面部（係合凸部）
１０サーフボード
１１フィンボックス
１１ａフィン挿入用溝
１２フィン 1 bolt (screw shaft)
1a Bolt head (gripping part)
1b Male thread part 1c Small diameter part 1d Male thread part 2 Tightening nut 2a Female thread part 3 Coil spring (spring)
4 Washer 5 Plate nut 5a Female thread 5c1 Side (engagement convex)
5d peripheral edge part 5f1 side part (engagement convex part)
10 Surfboard 11 Fin box 11a Fin insertion groove 12 Fin

Claims

A surfboard fin fixing tool for fixing a fin mounted on the fin box on the bottom surface of the surfboard,
A screw shaft having a grip portion at one end in the axial direction and having a small diameter portion at an intermediate position in the axial direction;
A tightening nut screwed into a male screw portion on the grip portion side of the screw shaft;
A washer held in a retaining state in the small diameter portion;
A spring disposed between the clamping nut and the washer;
In plan view, the width in one direction is shorter than the width of the fin insertion groove of the fin box, the width in the direction orthogonal to one direction is longer than the width of the fin insertion groove, It is composed of a plate nut formed with a female screw portion that can be screwed with a male screw portion on the other end side of the screw shaft,
The plate nut has a pair of engaging projections that are fitted in the fin insertion groove and engage with the walls on both sides of the groove with respect to the female screw portion, with the longitudinal direction intersecting the fin insertion groove. On both sides in the longitudinal direction,
The female screw portion of the plate nut or the male screw portion on the other end side of the screw shaft is threaded so that the male screw portion on the other end side of the screw shaft does not penetrate the female screw portion of the plate nut. A fin fixing tool for surfboards.

The surfboard fin fixing tool according to claim 1, wherein the grip portion and the tightening nut are formed in a cylindrical shape concentric with the axial direction of the screw shaft.

The spring is a coil spring in which a male screw portion on the grip portion side of the screw shaft is positioned inside,
The fin fixing tool for a surfboard according to claim 1 or 2, wherein a screw diameter of the male screw portion on the gripping portion side of the screw shaft is larger than a screw diameter of the male screw portion on the other end side.

The fin fixing for a surfboard according to any one of claims 1 to 3, wherein the plate nut is formed in an arc shape with a peripheral edge portion in a longitudinal direction centering on an axis of a female screw portion. Ingredients.