JP2004065862A - Badminton racket - Google Patents

Badminton racket Download PDF

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Publication number
JP2004065862A
JP2004065862A JP2002233275A JP2002233275A JP2004065862A JP 2004065862 A JP2004065862 A JP 2004065862A JP 2002233275 A JP2002233275 A JP 2002233275A JP 2002233275 A JP2002233275 A JP 2002233275A JP 2004065862 A JP2004065862 A JP 2004065862A
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JP
Japan
Prior art keywords
shaft
joint
vertical shaft
shaped joint
badminton racket
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JP2002233275A
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Japanese (ja)
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Minoru Yoneyama
米山　稔
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Yonex KK
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Yonex KK
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Priority to JP2002233275A priority Critical patent/JP2004065862A/en
Priority to EP03254340A priority patent/EP1388354B1/en
Priority to AT03254340T priority patent/ATE294620T1/en
Priority to DE60300605T priority patent/DE60300605T2/en
Priority to DK03254340T priority patent/DK1388354T3/en
Priority to CNB031274102A priority patent/CN1329095C/en
Publication of JP2004065862A publication Critical patent/JP2004065862A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
    • A63B49/032—T-shaped connection elements
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
    • A63B2102/04—Badminton

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Steroid Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Saccharide Compounds (AREA)
  • Laminated Bodies (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a generation rate of a defective product; and to strengthen adhesive strength of a T-shaped joint and a shaft by reducing the possibility of causing positional dislocation between these members after fitting the T-shaped joint and the shaft. <P>SOLUTION: This badminton racket is formed by joining a frame and the shaft via an adhesive by inserting an upper end part of a hollow shaft 2 into a vertical shaft part 6 of the T-shaped joint by inserting horizontal both shoulder parts 5 of the T-shaped joint 4 into hollow both end parts of the frame 1 formed in an elliptic shape. A plurality of ribs 9 are formed in the shaft direction on an outside surface of the vertical shaft part of the T-shaped joint. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、楕円形に形成したフレームの中空両端部にＴ型ジョイントの水平両肩部を挿入し、該Ｔ型ジョイントの垂直軸部に中空シャフトの上端部を挿入することによりフレームとシャフトとを接着剤を介して結合してなるバドミントンラケットに関するものである。
【０００２】
【従来の技術】
従来この種のバドミントンラケットとしては実公平２−１９１６３号に係るものが公知となっている。この公知のバドミントンラケットを製造するには、先ずＴ型ジョイントに液状のエポキシ樹脂等の接着剤を付着させ、次いで、このＴ型ジョイントの垂直軸部を中空シャフトの上端開口部に挿入するとともに金型内においてＴ型ジョイントの水平両肩部を楕円形に形成したフレームの中空両端部に挿入し、その後、シャフトとフレームのジョイント部の外周にＦＲＰ樹脂テープを巻き付けて補強し、金型を閉じて加熱成形していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、Ｔ型ジョイントをシャフトの上端開口部に挿入する作業を容易にするため、および接着剤がＴ型ジョイントとシャフト間に充分ゆきわたるように、従来のジョイントの垂直軸部の外径（直径）はそれぞれ中空シャフトの内径（直径）より０．２ｍｍ〜０．３ｍｍ程度小さく形成されている。このため、Ｔ型ジョイントとシャフトとの嵌合は比較的緩く、一旦、Ｔ型ジョイントの垂直軸部をシャフトの上端開口部に挿入した後に、これを金型内に設置する際に僅かな引張方向の外力がかかってもシャフトがＴ型ジョイントから引き抜ける方向に若干（例えば数ｍｍ）位置ずれすることが発生した。このような位置ずれが生じたままバドミントンラケットを製造すると、その使用中にＴ型ジョイントの垂直軸部の上端でシャフトの上端から抜け出た部分に応力が集中し、当該部分のジョイントが破断することが生じていた。
【０００４】
また、Ｔ型ジョイントにエポキシ樹脂のような粘度の高い接着剤を付着させてこれをシャフトの上端開口部に挿入する際に、Ｔ型ジョイントの例えば垂直軸部をシャフトの開口部に正確に同心上に挿入することはほとんど不可能で、通常は偏心した状態で挿入されるから、Ｔ型ジョイントの外周に付着された接着剤が偏心側のシャフトの端部によって掻き取られて薄くなり、接着力が低下することがあり、このためシャフトのフレームに対するねじり抵抗が弱くなるといった問題があった。
【０００５】
本発明は上記のような問題点に鑑みてなされたもので、その目的はＴ型ジョイントとシャフトとの嵌合後にこれらの間に位置ずれが生じる可能性を減らすことによって不良製品の発生率を低減し、かつＴ型ジョイントとシャフトとの接着力を強化してなるバドミントンラケットを提供することにある。
【０００６】
【課題を解決するための手段】
上記の目的を達成するため、本発明では、楕円形に形成したフレームの中空両端部にＴ型ジョイントの水平両肩部を挿入し、該Ｔ型ジョイントの垂直軸部に中空シャフトの上端部を挿入することによりフレームとシャフトとを接着剤を介して結合してなるバドミントンラケットにおいて、該Ｔ型ジョイントの該垂直軸部の外側面に複数本のリブを軸方向に形成してなるのである。
【０００７】
上記のリブの存在により、Ｔ型ジョイントをシャフトの上端部に挿入する際にリブの上端がシャフトの中空開口部の内面に密着するようにリブの寸法を規定すれば、Ｔ型ジョイントを一旦シャフトの中空開口部の所定の位置まで挿入後は、僅かな外力ではシャフトはジョイントから引き抜く方向に位置ずれしないから、製造後にジョイントとシャフトととの位置ずれによる不良品の発生を極力低減することができる。
【０００８】
また、上記のリブが複数本存在することにより、ジョイントの垂直軸部がシャフトの上端開口部に対して正しく同心上に挿入されるから、ジョイントに付着した接着剤が部分的にシャフトの上端開口部によって掻き取られることがなく、ジョイントの垂直軸部の外周にほぼ均等に接着剤が付着した状態となるから、従来のように接着効果が低減されることがない。
【０００９】
また、リブの存在により、従来のリブがない場合に比べて、Ｔ型ジョイントのシャフトに対する接着面積は増大するから、両者の接着強度は従来の場合よりも大きくなる。
【００１０】
好ましくは、前記リブを前記垂直軸部の軸方向に２〜８本形成することで、これにより前記のＴ型ジョイントとシャフトとの位置ずれの可能性がさらに低減しまた垂直軸部の接着面積が大きくなり更なる接着効果を上げることができる。
【００１１】
また好ましくは、前記各リブの幅及び高さが該垂直軸部の上方から下方にかけて徐々に小さくなるように形成することで、これによりＴ型ジョイントの垂直軸部をシャフトの上端から挿入する作業が容易となる。
【００１２】
また好ましくは、前記Ｔ型ジョイントの水平両肩部の上面に長手方向のリブを形成することである。さらに好ましくは、前記長手方向のリブを複数本形成してなることである。これによって、上記の場合と同様な理由により、Ｔ型ジョイントの水平両肩部とフレームの中空な両端部との間の接着面積が増え、両者の接着強度を増大させることができる。
【００１３】
また好ましくは、前記リブの高さを０．１〜１．０ｍｍとすることである。リブの高さをある程度大きくしてＴ型ジョイントをシャフトの上端部に挿入するときに、そのリブがシャフトの中空開口部の内面に一部食い込むようにすると、上記接着効果に加えてこの食い込みによりＴ型ジョイントとシャフトとの接合強度が大幅に向上する。
【００１４】
また好ましくは、前記Ｔ型ジョイントの前記垂直軸部の上端部における前記肩部との境界部をテーパー面として形成し、前記中空シャフトの上端開口部を略同一のテーパー面に座ぐり形成することである。そして、好ましくは、前記境界部の前記テーパー面が曲率半径０．５〜５．０ｍｍの範囲内に形成されることである。
【００１５】
これにより、Ｔ型ジョイント自体が強化されると共にシャフトの上端開口部とＴ型ジョイントが密着し両者の結合強度が一段と向上される。
【００１６】
【発明の実施の形態】
以下に本発明の好適な実施例について、添付の図面を参照にして説明する。
図１は本発明に係るバドミントンラケット枠の正面図で、バドミントンラケット枠は外観上はフレーム部１とシャフト部２とグリップ部３とからなっている。
フレーム部１とシャフト部２は図２及び図３に示したように、これらに内蔵されたＴ型ジョイント４によって結合されている。
フレーム部１及びシャフト部２はカーボン繊維を主体としたＦＲＰ製の中空管状体でＴ型ジョイント４はアルミニウム合金のような金属製である。
【００１７】
Ｔ型ジョイント４は略水平な両肩部５−５とこれらの肩部の中央から下方に延出した垂直軸部６とからなり、各水平肩部５の断面形状はフレーム部１の断面形状と同じ小判型で、垂直軸部の断面形状はシャフト部２の断面形状と同じ円形となっている。
【００１８】
水平な肩部５−５の平坦な上面中央部には１本のリブ（小突起）７が長手方向全長に亘って形成され、このリブは両端側に向けて徐々に高さ低くして、後述するフレーム両端開口部への挿入を容易にすることが好ましい。また両肩部の端部はフレームの中空な両端部への挿入を容易にするためにテーパー付の小径端部８−８となっている。
【００１９】
垂直軸部６の外周側面には４本のリブ（小突起）９が等間隔で軸方向に沿って形成され、垂直軸部６の下端はテーパー付の小径端部１０となっている。上記の肩部のリブ７及び垂直軸部６の各リブ９の高さは０．１〜１．０ｍｍに形成されている。この寸法はシャフト部２の内径との関係で決まるものであるが、何れの場合にもＴ型ジョイントの垂直軸部６を中空シャフト２の上端からシャフト内に挿入したときに、上記４つのリブ９によって垂直軸部６が中空シャフト内に密着嵌合することが必要である。従って、中空シャフトの内径が一定の場合、リブの高さを増すとＴ型ジョイントの垂直軸部の径が小さくなり、リブの高さが１．０ｍｍを越えるとＴ型ジョイントの垂直軸部の径が小さくなりすぎて必要な強度を保てなくなるので、リブの高さは１．０ｍｍが限度である。逆にリブの高さが０．１ｍｍ未満では後述するリブを設けた効果を奏することができなくなる。
【００２０】
Ｔ型ジョイントの垂直軸部における各リブ９の幅と高さは垂直軸部６の上方から下方にかけて徐々に小さくすることが好ましい。これにより、Ｔ型ジョイントの垂直軸部６をシャフト２の上端開口部に挿入する作業が容易となる。
【００２１】
また、上記のＴ型ジョイント４の水平肩部５と垂直軸部の境界部１１はテーパー面として形成されている。これに対応して、垂直軸部６が挿入される中空シャフト２の上端開口部の内周面１２は境界部１１のテーパー面と同じテーパー面となるように座ぐり形成されている。これにより、Ｔ型ジョイント４の垂直軸部６が中空シャフト２の上端開口部から挿入されたときに、境界部１１のテーパー面と中空シャフトの上端座ぐり部１２のテーパー面とが密着するようになっている。また、上記の境界部１１のテーパー面によって、Ｔ型ジョイント４自体の強度も増している。
【００２２】
上記Ｔ型ジョイント４の境界部１１のテーパー面の曲率半径は０．５〜５．０ｍｍの範囲内とすることで、この曲率半径よりも大きくなるとこの曲率半径に合致させるために形成したシャフトの先端の座ぐり部が大きくなり、シャフトの先端の強度が低下しすぎる。また、曲率半径を０．５ｍｍ未満にすると、シャフトの先端部とＴ型ジョイント４の境界部１１との密着による強度向上が期待できなくなる。
【００２３】
次に、上記のＴ型ジョイントを用いてバドミントンラケットを形成する工程について述べると、図３に示したように予め形成したアルミニウム合金製Ｔ型ジョイントを接着剤として準備した溶融したエポキシ樹脂中に浸して、Ｔ型ジョイントの外面にエポキシ樹脂を付着させる。次いで、このジョイント４の垂直軸部６をＦＲＰ製の中空シャフトの上端開口部から、ジョイントの境界部１１がシャフトの上端座ぐり部１２に当接するまで挿入する。
【００２４】
この時、垂直軸部６の外表面に形成された４本のリブ９が中空シャフト２の内周面に密着した状態で圧入されるように寸法設定されている。これにより、ジョイント４がシャフト２から僅かな外力によって位置ずれするようなことがないようになる。
【００２５】
次いで、予め楕円中空状に成形したカーボン繊維からなるＦＲＰ製のフレーム１の両端開口部内にＴ型ジョイント４の両水平肩部５，５を挿入する。この時、肩部の上面中央部に形成したリブ７がフレームの開口部内壁面に密着するので、ジョイント４とフレームとの係合が確実になりまた接着剤の偏りを防いで、所望の接着強度を確実に得ることができる。次いで、Ｔ型ジョイント部の外周にあたるフレーム１とシャフト２の連結部に帯状のＦＲＰプリプレグを巻き付け、この状態でＴ型ジョイント部を金型内に挿入し、金型を閉じて加熱成形する。
【００２６】
このようにして製造されたバドミントンラケットでは、図２に示すように、フレーム１とシャフトとはＴ型ジョイント６を介して強固に連結されまたその連結部はＦＲＰ樹脂層１３によって被覆されている。
【００２７】
本発明は上記の実施態様に限定されるものではなく、垂直軸部に形成されるリブ９の本数は複数本であればよく、好ましくは８本以下とすることである。また、水平肩部のリブ７も１本である必要はなく、複数本設けてもよい。
【００２８】
【発明の効果】
以上のように本発明のバドミントンラケットでは、Ｔ型ジョイント４の垂直軸部６の外側面に複数本のリブ９を軸方向に形成し、この垂直部を中空シャフト２の上端部に挿入するようにしたので、Ｔ型ジョイントをシャフトの上端部に挿入する際にリブの上端がシャフトの中空開口部の内面に密着するようにリブの寸法を規定すれば、Ｔ型ジョイントを一旦シャフトの中空開口部の所定の位置まで挿入後は、僅かな外力ではシャフトはジョイントから引き抜く方向に位置ずれしないから、製造後にジョイントとシャフトととの位置ずれによる不良品の発生を極力低減することができる。
【００２９】
また、上記のリブが複数本存在することにより、ジョイントの垂直軸部がシャフトの上端開口部に対して正しく同心上に挿入されるから、ジョイントに付着した接着剤が部分的にシャフトの上端開口部によって掻き取られることがなく、ジョイントの垂直軸部の外周にほぼ均等に接着剤が付着した状態となるから、従来のように接着効果が低減されることがない。
【００３０】
更にまた、リブの存在により、従来のリブがない場合に比べて、Ｔ型ジョイントのシャフトに対する接着面積は増大するから、両者の接着強度は従来の場合よりも大きくなる。
【図面の簡単な説明】
【図１】本発明を適用したバドミントンラケットの正面図。
【図２】本発明の要部であるバドミントンラケットのフレーム部とシャフト部の結合部分を示す要部断面図。
【図３】本発明に適用するＴ型ジョイントの正面図。
【図４】図３に示したＴ型ジョイントの底面図
【符号の説明】
１　　フレーム部
２　　シャフト部
４　　Ｔ型ジョイント
５　　肩部
６　　垂直軸部
７　　長手方向のリブ
９　　軸方向のリブ
１１　境界部
１２　座ぐり部[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the horizontal shoulders of the T-shaped joint are inserted into the hollow ends of the oval frame, and the upper end of the hollow shaft is inserted into the vertical shaft of the T-shaped joint. The present invention relates to a badminton racket that is formed by bonding together through an adhesive.
[0002]
[Prior art]
Conventionally, as this type of badminton racket, those related to Japanese Utility Model No. 2-19163 have been publicly known. In order to manufacture this known badminton racket, an adhesive such as a liquid epoxy resin is first attached to the T-shaped joint, and then the vertical shaft portion of the T-shaped joint is inserted into the upper end opening of the hollow shaft and the gold Insert the horizontal shoulders of the T-joint into the hollow ends of the oval frame in the mold, and then reinforce the FRP resin tape around the outer periphery of the joint between the shaft and the frame to close the mold. It was thermoformed.
[0003]
[Problems to be solved by the invention]
However, the outer diameter (diameter) of the vertical shaft portion of the conventional joint in order to facilitate the work of inserting the T-joint into the upper end opening of the shaft and so that the adhesive is sufficiently distributed between the T-joint and the shaft. Are formed smaller than the inner diameter (diameter) of the hollow shaft by about 0.2 mm to 0.3 mm. For this reason, the fitting between the T-joint and the shaft is relatively loose, and once the vertical shaft portion of the T-joint is inserted into the upper end opening of the shaft, it is slightly pulled when installed in the mold. Even if an external force in the direction is applied, the shaft is slightly displaced (for example, several mm) in the direction in which the shaft is pulled out from the T-shaped joint. When a badminton racket is manufactured with such a displacement, stress concentrates on the portion of the T-joint vertical shaft that protrudes from the top end of the shaft during use, and the joint at that portion breaks. Has occurred.
[0004]
In addition, when a highly viscous adhesive such as epoxy resin is attached to the T-joint and inserted into the upper end opening of the shaft, the vertical shaft, for example, of the T-joint is precisely concentric with the opening of the shaft. It is almost impossible to insert it on top, and it is usually inserted in an eccentric state. Therefore, the adhesive attached to the outer periphery of the T-shaped joint is scraped off by the end of the shaft on the eccentric side, and becomes thin. There is a problem that the force may be reduced, and the torsional resistance of the shaft to the frame becomes weak.
[0005]
The present invention has been made in view of the above problems, and its purpose is to reduce the possibility of occurrence of defective products by reducing the possibility of misalignment between the T-joint and the shaft after fitting. An object of the present invention is to provide a badminton racket that is reduced and has an enhanced adhesive force between a T-shaped joint and a shaft.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, the horizontal shoulders of the T-shaped joint are inserted into the hollow ends of the oval frame, and the upper end of the hollow shaft is connected to the vertical shaft of the T-shaped joint. In the badminton racket in which the frame and the shaft are joined via an adhesive by insertion, a plurality of ribs are formed in the axial direction on the outer surface of the vertical shaft portion of the T-joint.
[0007]
Due to the presence of the rib, once the T-joint is inserted into the upper end of the shaft, if the rib dimensions are defined such that the upper end of the rib is in close contact with the inner surface of the hollow opening of the shaft, the T-joint is once attached to the shaft. After insertion to the predetermined position of the hollow opening of the shaft, the shaft does not shift in the direction of pulling out from the joint with a slight external force, so it is possible to reduce the occurrence of defective products due to positional shift between the joint and the shaft as much as possible after manufacturing. it can.
[0008]
In addition, since there are a plurality of the ribs, the vertical shaft portion of the joint is inserted correctly and concentrically with respect to the upper end opening of the shaft. The adhesive is not scraped off by the portion and the adhesive is almost uniformly attached to the outer periphery of the vertical shaft portion of the joint, so that the adhesive effect is not reduced as in the conventional case.
[0009]
In addition, the presence of the ribs increases the adhesion area of the T-joint to the shaft as compared to the case without the conventional ribs, so that the adhesive strength between the two is greater than in the conventional case.
[0010]
Preferably, 2 to 8 ribs are formed in the axial direction of the vertical shaft portion, thereby further reducing the possibility of positional deviation between the T-joint and the shaft, and the bonding area of the vertical shaft portion. Can be increased to further increase the bonding effect.
[0011]
Preferably, the ribs are formed such that the width and height of the ribs gradually decrease from the upper side to the lower side of the vertical shaft portion, whereby the vertical shaft portion of the T-joint is inserted from the upper end of the shaft. Becomes easy.
[0012]
Also preferably, ribs in the longitudinal direction are formed on the upper surfaces of the horizontal shoulders of the T-shaped joint. More preferably, a plurality of the longitudinal ribs are formed. As a result, for the same reason as described above, the adhesive area between the horizontal shoulders of the T-joint and the hollow ends of the frame increases, and the adhesive strength between the two can be increased.
[0013]
Preferably, the height of the rib is 0.1 to 1.0 mm. When the rib height is increased to some extent and the T-joint is inserted into the upper end of the shaft, if the rib partially bites into the inner surface of the hollow opening of the shaft, in addition to the adhesive effect described above, The joint strength between the T-shaped joint and the shaft is greatly improved.
[0014]
Preferably, a boundary portion between the upper end portion of the vertical shaft portion of the T-shaped joint and the shoulder portion is formed as a tapered surface, and an upper end opening portion of the hollow shaft is formed on the substantially same tapered surface. It is. And preferably, the said taper surface of the said boundary part is formed in the range of curvature radius 0.5-5.0 mm.
[0015]
As a result, the T-joint itself is strengthened, and the upper end opening of the shaft and the T-joint are brought into close contact with each other, thereby further improving the coupling strength between them.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of a badminton racket frame according to the present invention. The badminton racket frame is composed of a frame part 1, a shaft part 2, and a grip part 3 in appearance.
As shown in FIGS. 2 and 3, the frame portion 1 and the shaft portion 2 are coupled to each other by a T-type joint 4 incorporated therein.
The frame portion 1 and the shaft portion 2 are FRP hollow tubular bodies mainly composed of carbon fibers, and the T-joint 4 is made of a metal such as an aluminum alloy.
[0017]
The T-shaped joint 4 includes substantially horizontal shoulder portions 5-5 and a vertical shaft portion 6 extending downward from the center of these shoulder portions. The cross-sectional shape of each horizontal shoulder portion 5 is the cross-sectional shape of the frame portion 1. The cross-sectional shape of the vertical shaft portion is the same circle as the cross-sectional shape of the shaft portion 2.
[0018]
A single rib (small projection) 7 is formed over the entire length in the longitudinal direction at the center of the flat upper surface of the horizontal shoulder 5-5, and this rib is gradually lowered toward both ends. It is preferable to facilitate insertion into opening portions at both ends of the frame which will be described later. Further, the end portions of both shoulder portions are tapered small-diameter end portions 8-8 for easy insertion into both hollow end portions of the frame.
[0019]
Four ribs (small protrusions) 9 are formed along the axial direction at equal intervals on the outer peripheral side surface of the vertical shaft portion 6, and the lower end of the vertical shaft portion 6 is a tapered small-diameter end portion 10. The height of the rib 7 of the shoulder portion and each rib 9 of the vertical shaft portion 6 is 0.1 to 1.0 mm. This dimension is determined by the relationship with the inner diameter of the shaft portion 2. In any case, when the vertical shaft portion 6 of the T-joint is inserted into the shaft from the upper end of the hollow shaft 2, the four ribs described above are used. 9, the vertical shaft portion 6 needs to be closely fitted into the hollow shaft. Therefore, when the inner diameter of the hollow shaft is constant, increasing the height of the rib reduces the diameter of the vertical shaft portion of the T-shaped joint, and when the height of the rib exceeds 1.0 mm, Since the diameter becomes too small to maintain the required strength, the height of the rib is limited to 1.0 mm. On the other hand, if the height of the rib is less than 0.1 mm, the effect of providing the rib described later cannot be achieved.
[0020]
It is preferable that the width and height of each rib 9 in the vertical shaft portion of the T-shaped joint be gradually reduced from the top to the bottom of the vertical shaft portion 6. This facilitates the operation of inserting the vertical shaft portion 6 of the T-joint into the upper end opening of the shaft 2.
[0021]
Further, the boundary portion 11 between the horizontal shoulder portion 5 and the vertical shaft portion of the T-shaped joint 4 is formed as a tapered surface. Correspondingly, the inner peripheral surface 12 of the upper end opening of the hollow shaft 2 into which the vertical shaft portion 6 is inserted is countersunk so as to have the same tapered surface as the tapered surface of the boundary portion 11. Thus, when the vertical shaft portion 6 of the T-shaped joint 4 is inserted from the upper end opening of the hollow shaft 2, the tapered surface of the boundary portion 11 and the tapered surface of the upper counterbore portion 12 of the hollow shaft are in close contact with each other. It has become. Further, the strength of the T-shaped joint 4 itself is increased by the tapered surface of the boundary portion 11.
[0022]
The radius of curvature of the tapered surface of the boundary portion 11 of the T-shaped joint 4 is in the range of 0.5 to 5.0 mm, and if the radius of curvature becomes larger than this radius of curvature, the shaft formed to match this radius of curvature. The counterbore of the tip becomes large, and the strength of the tip of the shaft is too low. On the other hand, if the radius of curvature is less than 0.5 mm, an improvement in strength due to the close contact between the tip of the shaft and the boundary 11 of the T-shaped joint 4 cannot be expected.
[0023]
Next, a process for forming a badminton racket using the above-described T-shaped joint will be described. As shown in FIG. 3, a preformed aluminum alloy T-shaped joint is immersed in a molten epoxy resin prepared as an adhesive. Then, an epoxy resin is adhered to the outer surface of the T-shaped joint. Next, the vertical shaft portion 6 of the joint 4 is inserted from the upper end opening portion of the FRP hollow shaft until the boundary portion 11 of the joint comes into contact with the upper end counterbore portion 12 of the shaft.
[0024]
At this time, the dimensions are set so that the four ribs 9 formed on the outer surface of the vertical shaft portion 6 are press-fitted in close contact with the inner peripheral surface of the hollow shaft 2. This prevents the joint 4 from being displaced from the shaft 2 by a slight external force.
[0025]
Next, both horizontal shoulder portions 5 and 5 of the T-shaped joint 4 are inserted into the opening portions at both ends of the FRP frame 1 made of carbon fiber previously formed into an oval hollow shape. At this time, since the rib 7 formed at the center of the upper surface of the shoulder is in close contact with the inner wall surface of the opening of the frame, the engagement between the joint 4 and the frame is ensured and the bias of the adhesive is prevented, and the desired adhesive strength is achieved. Can be definitely obtained. Next, a belt-like FRP prepreg is wound around the connecting portion between the frame 1 and the shaft 2 that is the outer periphery of the T-shaped joint portion. In this state, the T-shaped joint portion is inserted into the mold, and the mold is closed and heat-molded.
[0026]
In the badminton racket manufactured as described above, as shown in FIG. 2, the frame 1 and the shaft are firmly connected via the T-shaped joint 6, and the connecting portion is covered with the FRP resin layer 13.
[0027]
The present invention is not limited to the above-described embodiment, and the number of ribs 9 formed on the vertical shaft portion may be a plurality, preferably 8 or less. Moreover, the rib 7 of a horizontal shoulder part does not need to be one, and you may provide multiple pieces.
[0028]
【The invention's effect】
As described above, in the badminton racket of the present invention, a plurality of ribs 9 are formed on the outer surface of the vertical shaft portion 6 of the T-shaped joint 4 in the axial direction, and the vertical portion is inserted into the upper end portion of the hollow shaft 2. Therefore, when the T-joint is inserted into the upper end of the shaft, if the rib dimensions are defined so that the upper end of the rib is in close contact with the inner surface of the hollow opening of the shaft, the T-joint is once opened in the hollow of the shaft. After insertion to a predetermined position of the part, the shaft does not shift in the direction of pulling out from the joint with a slight external force, so that the generation of defective products due to the positional shift between the joint and the shaft can be reduced as much as possible.
[0029]
In addition, since there are a plurality of the ribs described above, the vertical shaft portion of the joint is inserted correctly and concentrically with respect to the upper end opening of the shaft. The adhesive is not scraped off by the portion and the adhesive is almost uniformly attached to the outer periphery of the vertical shaft portion of the joint, so that the adhesive effect is not reduced as in the conventional case.
[0030]
Furthermore, since the area of adhesion of the T-joint to the shaft increases due to the presence of the ribs compared to the case without the conventional ribs, the adhesive strength between the two becomes larger than in the conventional case.
[Brief description of the drawings]
FIG. 1 is a front view of a badminton racket to which the present invention is applied.
FIG. 2 is a cross-sectional view of a main part showing a connecting portion between a frame part and a shaft part of a badminton racket that is a main part of the present invention.
FIG. 3 is a front view of a T-shaped joint applied to the present invention.
FIG. 4 is a bottom view of the T-shaped joint shown in FIG.
DESCRIPTION OF SYMBOLS 1 Frame part 2 Shaft part 4 T-shaped joint 5 Shoulder part 6 Vertical shaft part 7 Longitudinal rib 9 Axial rib 11 Boundary part 12 Counterbore part

Claims (8)

楕円形に形成したフレームの中空両端部にＴ型ジョイントの水平両肩部を挿入し、該Ｔ型ジョイントの垂直軸部に中空シャフトの上端部を挿入することによりフレームとシャフトとを接着剤を介して結合してなるバドミントンラケットにおいて、該Ｔ型ジョイントの該垂直軸部の外側面に複数本のリブを軸方向に形成してなることを特徴とするバドミントンラケット。Insert the horizontal shoulders of the T-joint into the hollow ends of the oval frame, and insert the upper end of the hollow shaft into the vertical shaft of the T-joint. A badminton racket, wherein a plurality of ribs are formed in an axial direction on an outer surface of the vertical shaft portion of the T-joint. 前記リブを前記垂直軸部の軸方向に２〜８本形成してなることを特徴とする請求項１に記載のバドミントンラケット。The badminton racket according to claim 1, wherein 2 to 8 ribs are formed in an axial direction of the vertical shaft portion. 前記各リブの幅及び高さが該垂直軸部の上方から下方にかけて徐々に小さくなるように形成されてなることを特徴とする請求項１または２に記載のバドミントンラケット。3. The badminton racket according to claim 1, wherein the ribs are formed so that the width and height of each rib gradually decrease from above to below the vertical shaft portion. 前記Ｔ型ジョイントの水平両肩部の上面に長手方向のリブを形成してなることを特徴とする請求項１乃至３の何れか１項に記載のバドミントンラケット。The badminton racket according to any one of claims 1 to 3, wherein ribs in the longitudinal direction are formed on the upper surfaces of the horizontal shoulder portions of the T-shaped joint. 前記長手方向のリブを複数本形成してなることを特徴とする請求項４載のバドミントンラケット。The badminton racket according to claim 4, wherein a plurality of the ribs in the longitudinal direction are formed. 前記リブの高さが０．１〜１．０ｍｍであることを特徴とする請求項１乃至５の何れか１項に記載のバドミントンラケット。The badminton racket according to any one of claims 1 to 5, wherein a height of the rib is 0.1 to 1.0 mm. 前記Ｔ型ジョイントの前記垂直軸部の上端部における前記肩部との境界部がテーパー面として形成され、前記中空シャフトの上端開口部が略同一のテーパー面に座ぐり形成されてなることを特徴とする請求項１乃至６の何れか１項に記載のバドミントンラケット。A boundary portion between the upper end portion of the vertical shaft portion of the T-shaped joint and the shoulder portion is formed as a tapered surface, and an upper end opening portion of the hollow shaft is formed in a substantially identical tapered surface. The badminton racket according to any one of claims 1 to 6. 前記境界部の前記テーパー面が曲率半径０．５〜５．０ｍｍの範囲内に形成されてなることを特徴とする請求項７記載のバドミントンラケット。The badminton racket according to claim 7, wherein the tapered surface of the boundary portion is formed within a radius of curvature of 0.5 to 5.0 mm.
JP2002233275A 2002-08-09 2002-08-09 Badminton racket Pending JP2004065862A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2002233275A JP2004065862A (en) 2002-08-09 2002-08-09 Badminton racket
EP03254340A EP1388354B1 (en) 2002-08-09 2003-07-09 Badminton racket
AT03254340T ATE294620T1 (en) 2002-08-09 2003-07-09 BARRACKER RACKET
DE60300605T DE60300605T2 (en) 2002-08-09 2003-07-09 Badminton rackets
DK03254340T DK1388354T3 (en) 2002-08-09 2003-07-09 badminton Racket
CNB031274102A CN1329095C (en) 2002-08-09 2003-08-06 Badminton racket

Applications Claiming Priority (1)

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CN (1) CN1329095C (en)
AT (1) ATE294620T1 (en)
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Publication number Priority date Publication date Assignee Title
JP2007068971A (en) * 2005-09-03 2007-03-22 Wilson Sporting Goods Co Reinforcing member for badminton racket
WO2009017112A1 (en) 2007-08-01 2009-02-05 Yonex Kabushiki Kaisha Badminton racket and manufacturing method of badminton racket
US7727094B2 (en) * 2008-02-22 2010-06-01 Pick-A-Paddle, Inc. Institutional badminton racket
JP2010131319A (en) * 2008-12-08 2010-06-17 Yonex Co Ltd Badminton racket and manufacturing method of badminton racket

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GB2440509B (en) * 2006-08-01 2011-07-06 Dunlop Slazenger Group Ltd Badminton racquet and method of manufacturing it
CN105214289B (en) * 2015-11-06 2018-08-21 厦门富帏复合材料有限公司 Netted racket connector and attaching method thereof
CN107281718A (en) * 2017-05-03 2017-10-24 深圳大学 A kind of non-crystaline amorphous metal T connector modified fish oil racket and preparation method thereof
CN107261436B (en) * 2017-06-16 2019-11-22 徐建昇 Stabilized structure type racket

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GB1209277A (en) * 1968-07-08 1970-10-21 Yoneyama Racket Kk Metal game racket
JPS614374Y2 (en) * 1978-12-07 1986-02-10
GB2076295A (en) * 1980-05-16 1981-12-02 Sondico International Ltd Games racket
JPS6099965U (en) * 1983-12-16 1985-07-08 ヨネックス株式会社 badminton racket frame
CN2164869Y (en) * 1993-07-22 1994-05-18 尤景三 Improved badminton racket
CN2178546Y (en) * 1993-10-20 1994-10-05 尤景三 Badminton racket
US5326098A (en) * 1993-12-10 1994-07-05 Ou Li Min Badminton racket

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007068971A (en) * 2005-09-03 2007-03-22 Wilson Sporting Goods Co Reinforcing member for badminton racket
US7211010B2 (en) * 2005-09-03 2007-05-01 Wilson Sporting Goods Co. Reinforcing member for a badminton racquet
WO2009017112A1 (en) 2007-08-01 2009-02-05 Yonex Kabushiki Kaisha Badminton racket and manufacturing method of badminton racket
JP2009034333A (en) * 2007-08-01 2009-02-19 Yonex Co Ltd Badminton racket and manufacturing method of badminton racket
US8211266B2 (en) 2007-08-01 2012-07-03 Yonex Kabushiki Kaisha Badminton racket and manufacturing method of badminton racket
US7727094B2 (en) * 2008-02-22 2010-06-01 Pick-A-Paddle, Inc. Institutional badminton racket
JP2010131319A (en) * 2008-12-08 2010-06-17 Yonex Co Ltd Badminton racket and manufacturing method of badminton racket

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Publication number Publication date
CN1329095C (en) 2007-08-01
CN1488415A (en) 2004-04-14
EP1388354A1 (en) 2004-02-11
DE60300605D1 (en) 2005-06-09
DE60300605T2 (en) 2005-10-20
ATE294620T1 (en) 2005-05-15
EP1388354B1 (en) 2005-05-04
DK1388354T3 (en) 2005-05-30

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