JPH07155407A - Racket frame - Google Patents

Racket frame

Info

Publication number
JPH07155407A
JPH07155407A JP5341555A JP34155593A JPH07155407A JP H07155407 A JPH07155407 A JP H07155407A JP 5341555 A JP5341555 A JP 5341555A JP 34155593 A JP34155593 A JP 34155593A JP H07155407 A JPH07155407 A JP H07155407A
Authority
JP
Japan
Prior art keywords
frame
opening
shaft
ball striking
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5341555A
Other languages
Japanese (ja)
Inventor
Toshihiro Inubushi
敏博 犬伏
Yasuhiro Sakata
泰博 坂田
Ryoji Higuchi
良司 樋口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizuno Corp
Original Assignee
Mizuno Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mizuno Corp filed Critical Mizuno Corp
Priority to JP5341555A priority Critical patent/JPH07155407A/en
Publication of JPH07155407A publication Critical patent/JPH07155407A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To decrease air resistance a frame receives by making the shape of a shaft portion an oval shape of a convex lenslike section, forming an outer side groove, an inner side groove and an opening portion groove at widthwise center portion, and making the opening area of a triangular opening portion and the interior angle of a triangular shaft portion consisting of straight lines that circumscribe the opening portion, of specific values. CONSTITUTION:The opening area of the opening 5 of a shaft portion 3 is made to be 70 or 120cm<2>, and the interior angle (h) of a triangle consisting of straight lines E, F, G that circumscribe the opening portion 5, is made to be 50 or 70 degrees, and a frame consisting of a ball striking member 2a, a yoke member 15a and shaft members 3a, 3b is formed into an oval shape whose section is of a convex lens shape that makes a frame width a long axis and makes the frame thickness X of a center portion a short axis. In addition, an outer side groove is formed at the center portion of the frame width direction of the outside 6 of the shaft members 3a, 3b and the ball striking member 2a, and an inner side groove is formed at the center portion of the frame width direction of the inside 7 of the yoke member 15a and the ball striking member 2a, and an opening portion side groove is formed at the central portion of an opening portion side 8.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ラケットをスイングし
た時にフレームに受ける空気抵抗を少なくしたラケット
フレームに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a racket frame that reduces the air resistance received by the frame when the racket swings.

【0002】[0002]

【従来の技術】ラケットフレーム(以下フレームと称す
る)は、打球部とシャフト部とグリップ部より成るもの
が一般的である。成形素材としては、木材、竹材、金属
材、合成樹脂材やこれらの組み合わせ材から成り、近時
は、フレームの形状も「デカラケ」「ラージサイズ」と
称し、打球面部の面積が従来のものより20〜30パー
セント以上も拡大したものが提供されており、打球部の
面積を広くすることにより打球しやすくしたものであ
る。又、「厚ラケ」と称しガット面に直交するフレーム
の側面幅を全体もしくは部分的に広くしたものも提供さ
れており、このラケットは打球時のボールの振動数とフ
レームの固有振動数を近づけ打球したボールの反発性を
向上せしめることを目的としたものである。しかし、打
球面の面積を広くしたりフレームの側面幅を広くする
と、打球時にフレームにかかる空気抵抗が大きくなりス
イングしにくくなると言う問題が生じてきた。特に、地
面に対して角度を持ってスイングした場合の空気抵抗
は、地面に対して平行(フラット)にスイングした場合
に比較して大きくなる。
2. Description of the Related Art A racket frame (hereinafter referred to as a frame) generally comprises a hitting portion, a shaft portion and a grip portion. The molding material is made of wood, bamboo, metal, synthetic resin, or a combination of these materials. Recently, the shape of the frame is also called "decarake" or "large size", and the area of the ball striking face is larger than that of conventional materials. It is provided that the size is expanded by 20 to 30% or more, and the area of the hitting portion is widened to facilitate hitting. Also called "thick racket", the side width of the frame orthogonal to the gut surface is widened in whole or in part, and this racket brings the frequency of the ball at the time of hitting and the natural frequency of the frame close to each other. The purpose is to improve the resilience of the hit ball. However, when the area of the ball striking surface is widened or the side surface width of the frame is widened, there arises a problem that the air resistance applied to the frame at the time of hitting the ball becomes large and it becomes difficult to swing. In particular, the air resistance when swinging at an angle with respect to the ground is larger than that when swinging parallel (flat) to the ground.

【0003】そこで、これらの問題を解決する一手段と
して、本出願人は、実開平4−22980号考案や、特
開平4−49985号発明を出願した。これらの考案や
発明は、フレームを水滴形形状、勾玉形形状、翼形形
状、なす形形状またはこれらと類型に形成すると共にフ
レームの表面を粗面にし、フレームの断面形状の長手方
向の軸線を打球面に対して5〜45度の傾きに形成する
ことによりスイング時の空気抵抗を減少させようとした
ものである。ところが、前記考案,発明こおいても未だ
不十分であった。
Therefore, as one means for solving these problems, the present applicant has filed the invention of Japanese Utility Model Laid-Open No. 4-22980 and the invention of Japanese Patent Laid-Open No. 4-49985. According to these inventions and inventions, the frame is formed into a water drop shape, a jewel shape, a wing shape, a knuckle shape or the like, and the surface of the frame is roughened so that the longitudinal axis of the cross sectional shape of the frame is It is intended to reduce the air resistance during a swing by forming it at an inclination of 5 to 45 degrees with respect to the hitting surface. However, the above inventions and inventions are still insufficient.

【0004】プレーヤーがラケットをスイングする早さ
(スイングスピード)は地面に対する角度によって異な
るが、上級者においては秒速33.3 mに達し時速に換
算すると略120kmである。これをもとにフレームに受
ける空気抵抗を風洞実験により観察すると、ラケットの
前面に受けた空気は、打球部のフレーム表面で空気流線
が早期に剥離してフレーム後方に空気の渦を発生させ、
フレーム前面とフレーム背面に圧力差が生じフレームに
空気抵抗が生じる。中でも、スロートと称されるフレー
ムのシャフト部に形成した三角形形状部において大きな
空気の渦が発生しスムーズなスイングを妨げていること
が判明した。従来のテニスラケットにおいては、空気抵
抗を減少させるためにこのスロート部について格別の対
策を講じたものは見られなかった。
The speed at which the player swings the racket (swing speed) varies depending on the angle with respect to the ground, but for advanced players, the speed reaches 33.3 m / s, which is approximately 120 km per hour. Based on this, when observing the air resistance received on the frame by a wind tunnel experiment, the air received on the front surface of the racket caused air streamlines to separate early on the frame surface of the hitting part, causing air vortices to be generated behind the frame. ,
A pressure difference occurs between the front surface of the frame and the back surface of the frame, and air resistance occurs in the frame. In particular, it has been found that a large air vortex is generated in the triangular portion formed on the shaft portion of the frame called a throat, which hinders a smooth swing. In the conventional tennis racket, no special measures were taken for this throat part in order to reduce the air resistance.

【0005】[0005]

【発明が解決しようとする課題】スイング時にフレーム
の表面に受ける空気抵抗を減少せしめてスムーズなスイ
ングを可能とするためには、打球部の改良だけではなく
スロート部を含めたラケット全体を対象に検討する必要
がある。スロート部の空気抵抗は、三角形形状の各頂点
部の角度や形状や開口部の面積が空気抵抗の大小に大き
く影響するため、打球部及びスロート部を空気抵抗の少
ない形状を有するフレームに形成する必要性が判明し
た。
In order to reduce the air resistance received on the surface of the frame at the time of swing to enable a smooth swing, not only improvement of the hitting portion but also the entire racket including the throat portion is targeted. Need to consider. Regarding the air resistance of the throat part, the angle and shape of each vertex of the triangular shape and the area of the opening greatly affect the size of the air resistance, so the striking part and the throat part are formed in a frame having a shape with low air resistance. The need turned out.

【0006】[0006]

【課題を解決するための手段】そこで、本出願人は前記
課題を解決するために、フレームの打球部とヨーク部と
三角形形状の開口部を有するシャフト部を、フレームの
幅方向を長軸としフレームの厚さ方向を短軸とする凸レ
ンズ状の断面を有する楕円形形状に形成すると共に、幅
方向の中央部に任意の外側溝,内側溝,開口部側溝を形
成し、三角形形状開口部の開口面積を70cm2 乃至12
0cm2 とし、開口部5に外接する直線から成る三角形の
シャフト部の内角hを50度乃至70度に形成すること
によりフレーム全体に受ける空気抵抗を減少せしめる手
段としたものである。
Therefore, in order to solve the above-mentioned problems, the applicant of the present invention uses a hitting portion of a frame, a yoke portion and a shaft portion having a triangular opening as a major axis in the width direction of the frame. The frame is formed into an elliptical shape having a convex lens-shaped cross section with the minor axis in the thickness direction, and an arbitrary outer groove, inner groove, or opening side groove is formed in the center in the width direction. Opening area 70 cm 2 to 12
And 0 cm 2, is obtained by a means allowed to reduce the air resistance applied to the entire frame by forming internal angle h of the shaft portion of the triangle comprising a straight line circumscribing the opening 5 to 50 degrees to 70 degrees.

【0007】[0007]

【作用】フレーム表面に当たる空気流は、フレームの打
球部の外側と内側とシャフト部の開口部に流れ、外側
溝,内側溝,開口部側溝内に流入して渦を発生させ意図
的に乱流域を生成するから、該乱流域がフレームの表面
から剥離しようとする空気の流れを引き止め、剥離点を
後方に遷移しフレームの後方に生じる乱流域を減少せし
めるから、フレーム前面とフレーム背面の圧力差を小さ
くして空気抵抗を減少せしめる作用を奏する。
[Operation] The air flow hitting the surface of the frame flows to the outside and inside of the hitting portion of the frame and the opening of the shaft, and flows into the outer groove, the inner groove, and the opening side groove to intentionally generate a turbulent flow region. Therefore, the turbulent flow region stops the flow of air that tends to separate from the surface of the frame, transitions the separation point backward and reduces the turbulent flow region generated behind the frame, so that the pressure difference between the front surface of the frame and the rear surface of the frame is reduced. To reduce the air resistance.

【0008】[0008]

【実施例】図1は本発明フレームの正面図、図2は本発
明フレームの側面図、図3は本発明フレームのシャフト
部の構成を示す要部拡大図、図4〜図6は本発明フレー
ムの構成を示す要部切断拡大端面図、、図7は本発明ラ
ケットフレームと従来のラケットフレームの空気抵抗を
風洞実験により比較した図面である。以下図面に基づき
説明する。
1 is a front view of the frame of the present invention, FIG. 2 is a side view of the frame of the present invention, FIG. 3 is an enlarged view of a main portion showing the structure of a shaft portion of the frame of the present invention, and FIGS. FIG. 7 is an enlarged end view showing the structure of the frame, and FIG. 7 is a drawing comparing the air resistances of the racket frame of the present invention and the conventional racket frame by a wind tunnel experiment. A description will be given below with reference to the drawings.

【0009】任意繊維強化樹脂で、打球部材2aとヨー
ク部材15aからなる打球部2と、シャフト部材3a,
3bとヨーク部材15aで形成した略三角形形状開口部
5を有するシャフト部3と、グリップ部材4aからなる
グリップ部4を一体に形成し、前記シャフト部3の略三
角形形状開口部5は、開口面積を70cm2 乃至120cm
2 とし、開口部5に外接する直線E,F,Gから成る三
角形の内角hを50度乃至70度に形成し、前記打球部
材2aとヨーク部材15aとシャフト部材3a,3bか
らなるフレームを、フレーム幅Yを長軸とし中央部のフ
レーム厚Xを短軸とした断面凸レンズ状の楕円形形状に
形成する。楕円形形状のフレーム前面13,フレーム背
面13aの形状は必ずしも同形でなくてもよく、両面を
略同様に使用する硬式ラケットの場合と、片面を主に使
用する軟式ラケットの場合のようにプレースタイルによ
り変化させることも所望により任意に対応可能である。
前記打球部材2aとシャフト部材3a,3bの外側6の
フレーム幅Y方向の中央部に外側溝9を形成し、打球部
材2aとヨーク部材15aの内側7のフレーム幅Y方向
の中央部に内側溝10を形成し、前記略三角形形状開口
部5を形成するシャフト部材3a,3bとヨーク部材1
5aの開口部側8の中央部に開口部側溝11を形成し、
ラケットフレーム1を形成するとフレーム側面13bに
は打球部2からシャフト部3にかけて連続した外側溝9
が形成される。
A ball striking member 2a and a yoke member 15a made of an arbitrary fiber reinforced resin, a shaft member 3a,
3b and a shaft portion 3 having a substantially triangular opening 5 formed by a yoke member 15a and a grip portion 4 composed of a grip member 4a are integrally formed, and the substantially triangular opening 5 of the shaft portion 3 has an opening area 70 cm 2 to 120 cm
2 , the inner angle h of the triangle consisting of the straight lines E, F and G circumscribing the opening 5 is formed to be 50 to 70 degrees, and the frame composed of the hitting member 2a, the yoke member 15a, and the shaft members 3a and 3b is It is formed in an elliptical shape having a convex lens shape in cross section with the frame width Y as the major axis and the frame thickness X at the center as the minor axis. The shapes of the elliptical frame front surface 13 and the frame back surface 13a do not necessarily have to be the same, and the play style is the same as in the case of a hard racket where both sides are used in the same manner and the case of a soft racket where one side is mainly used. If desired, it can be arbitrarily changed.
An outer groove 9 is formed in the center portion of the outer side 6 of the ball striking member 2a and the shaft members 3a and 3b in the frame width Y direction, and an inner groove is formed in the center portion of the inner side 7 of the ball striking member 2a and the yoke member 15a in the frame width Y direction. Shaft members 3a and 3b forming the substantially triangular shaped opening 5 and the yoke member 1
An opening side groove 11 is formed in the center of the opening side 8 of 5a,
When the racket frame 1 is formed, an outer groove 9 continuous from the hitting portion 2 to the shaft portion 3 is formed on the frame side surface 13b.
Is formed.

【0010】前記外側溝9や内側溝10や開口部側溝1
1は、連続した溝に形成することも、部分的に欠断部を
有する溝に形成することも所望により任意に実施可能で
ある。又、溝の形状は、打球部材2aやシャフト部材3
a,3b部に設ける外側溝9のように断面を「U」字形
に形成したり、シャフト部材3a,3b部の開口部側溝
11のように断面を「コ」字形に形成したり、図示を省
略したが「v」字形に形成したりその他所望により任意
な形状に形成することも実施可能である。前記外側溝
9,内側溝10の形成は、予め金型に溝形を形成しフレ
ーム形成と同時に外側溝9,内側溝10を形成したり、
断面凸レンズ状の楕円形形状に形成したフレームに後か
ら外側溝9,内側溝10を掘削する等任意に実施可能で
ある。
The outer groove 9, the inner groove 10 and the opening side groove 1
1 can be formed in a continuous groove or a groove partially having a cutout portion, as desired. The shape of the groove is the ball hitting member 2a and the shaft member
The cross-section is formed in a "U" shape like the outer groove 9 provided in the portions a and 3b, or the cross-section is formed in a "U" shape like the opening side groove 11 of the shaft members 3a and 3b. Although omitted, it may be formed in a “v” shape or any other desired shape. The outer groove 9 and the inner groove 10 are formed by forming a groove shape in the mold in advance and forming the outer groove 9 and the inner groove 10 at the same time when the frame is formed.
The outer groove 9 and the inner groove 10 may be excavated later in a frame formed in an elliptical shape having a convex lens shape in cross section.

【0011】前記打球部材2aとシャフト部材3a,3
bとヨーク部材15aの所望部にはガット穴12を既知
手段にて形成する。又、図示を省略するが、フレーム1
の先端部に既知のフレーム保護体やガット保護体等を設
けたり、フレーム1の両側にバランス調節体を設けたり
する等は所望により任意に実施可能である。前記ラケッ
トフレーム1の打球部材2aと、シャフト部材3a,3
bと、ヨーク部材15aは、フレーム厚Xとフレーム幅
Yの比率を、1:2.5乃至1:3.5に設定して形成
する。
The ball striking member 2a and the shaft members 3a, 3
The gut hole 12 is formed by a known means at a desired portion of b and the yoke member 15a. Although not shown, the frame 1
A known frame protector, gut protector, or the like may be provided at the tip of the frame, or balance adjusting bodies may be provided on both sides of the frame 1, if desired. The hitting member 2a of the racket frame 1 and the shaft members 3a, 3
b and the yoke member 15a are formed by setting the ratio of the frame thickness X and the frame width Y to 1: 2.5 to 1: 3.5.

【0012】任意繊維強化樹脂とは、ウレタン樹脂やナ
イロン樹脂やその他これらと同効質の任意合成樹脂に、
ガラス繊維やカーボン繊維やケブラー繊維やウイスカー
その他これらと同効質の任意繊維を強化繊維として用い
たものである。なお、グリップ部には既知のグリップテ
ープ,グリップキャップ等を所望により任意に取着可能
である。
The optional fiber reinforced resin is a urethane resin, a nylon resin or any other synthetic resin having the same effect as those,
Glass fibers, carbon fibers, Kevlar fibers, whiskers and other optional fibers having the same effect as these are used as reinforcing fibers. A known grip tape, grip cap, or the like can be arbitrarily attached to the grip portion if desired.

【0013】[0013]

【発明の効果】本発明は以上の構成にしたから、フレー
ムに受ける空気抵抗は著減する。フレームに対する空気
抵抗は、ラケットを地面に対して角度を持ってスイング
した場合、その傾き角度により異なる。本発明フレーム
と従来フレームの空気抵抗の大小を、風洞実験により風
流に対して角度を変えて測定し比較すると、図7に示す
通りであり、本発明フレームの空気抵抗値が各角度にお
いて小さいことが分かる。
Since the present invention has the above construction, the air resistance received by the frame is significantly reduced. When the racket swings at an angle with respect to the ground, the air resistance to the frame varies depending on the tilt angle. The magnitude of the air resistance of the frame of the present invention and that of the conventional frame are measured by a wind tunnel experiment while changing the angle with respect to the wind flow, and are compared, as shown in FIG. 7, and the air resistance value of the frame of the present invention is small at each angle. I understand.

【0014】特に打球部材とヨーク部材の内側に設けた
内側溝と、開口部に設けた開口部側溝の効果は次の表1
に示すように大きい。
In particular, the effects of the inner groove provided inside the ball striking member and the yoke member and the opening side groove provided in the opening are shown in Table 1 below.
Large as shown in.

【0015】[0015]

【表1】 [Table 1]

【0016】このように、フレームの内側と開口部に流
入した空気流は内側溝と開口部側溝に流入して渦を発生
させ意図的に乱流域を生成するから、該乱流域がフレー
ムの表面から剥離しようとする空気の流れを引き止め、
剥離点を後方に遷移しフレームの後方に生じる乱流域を
減少せしめ、フレーム前面とフレーム背面の圧力差を小
さくしてスイング時にラケットが受ける空気抵抗を減少
せしめる効果を有する。
As described above, since the air flow that has flown into the inside of the frame and the opening flows into the inside groove and the opening side groove to generate a vortex and intentionally generate a turbulent flow region, the turbulent flow region is the surface of the frame. To stop the flow of air trying to separate from
This has the effect of reducing the turbulent flow region that occurs behind the frame by shifting the separation point to the rear, and reducing the pressure difference between the front surface of the frame and the rear surface of the frame to reduce the air resistance received by the racket during swing.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明ラケットフレームの正面図。FIG. 1 is a front view of a racket frame of the present invention.

【図2】本発明ラケットフレームの側面図。FIG. 2 is a side view of the racket frame of the present invention.

【図3】本発明ラケットフレームのシャフト部の構成を
示す要部拡大図。
FIG. 3 is an enlarged view of an essential part showing the configuration of a shaft part of the racket frame of the present invention.

【図4】本発明ラケットフレームの構成を示すA−A部
切断拡大端面図。
FIG. 4 is an enlarged end view of a section AA showing the configuration of the racket frame of the present invention.

【図5】本発明ラケットフレームの構成を示すB−B部
切断拡大端面図。
FIG. 5 is an enlarged end view of a BB section showing a configuration of a racket frame of the present invention.

【図6】本発明ラケットフレームの構成を示すC−C部
切断拡大端面図。
FIG. 6 is an enlarged end view taken along the line CC of the racket frame of the present invention.

【図7】本発明ラケットフレームと従来のラケットフレ
ームの空気抵抗を風洞実験により比較した図面。
FIG. 7 is a drawing comparing air resistances of the racket frame of the present invention and a conventional racket frame by a wind tunnel experiment.

【符号の説明】[Explanation of symbols]

1 ラケットフレーム 2 打球部 2a 打球部材 3 シャフト部 3a シャフト部材 3b シャフト部材 4 グリップ部 4a グリップ部材 5 開口部 6 外側 7 内側 8 開口部側 9 外側溝 10 内側溝 11 開口部側溝 12 ガット穴 13 フレーム前面 13a フレーム背面 13b フレーム側面 15a ヨーク部材 X フレーム厚 Y フレーム幅 h 内角 E 線 F 線 G 線 1 racket frame 2 ball hitting portion 2a ball hitting member 3 shaft portion 3a shaft member 3b shaft member 4 grip portion 4a grip member 5 opening 6 outer 7 inner 8 opening side 9 outer groove 10 inner groove 11 opening side groove 12 frame 13 Front surface 13a Frame rear surface 13b Frame side surface 15a Yoke member X frame thickness Y Frame width h Inner angle E line F line G line

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 打球部材2aとヨーク部材15aからな
る打球部2と、シャフト部材3a,3bとヨーク部材1
5aで形成した略三角形形状開口部5を有するシャフト
部3と、グリップ部材4aからなるグリップ部4を一体
に形成して成る繊維強化樹脂製ラケットフレーム1にお
いて、 前記シャフト部3の略三角形形状開口部5は、開口面積
を70cm2 乃至120cm2 とし、開口部5に外接する直
線E,F,Gから成る三角形の内角hを50度乃至70
度に形成し、 前記打球部材2aとヨーク部材15aとシャフト部材3
a,3bからなるフレームを、フレーム幅Yを長軸とし
中央部のフレーム厚Xを短軸とした断面凸レンズ状の楕
円形形状に形成し、 前記打球部材2aとシャフト部材3a,3bの外側6の
フレーム幅Y方向の中央部に外側溝9を形成し、打球部
材2aとヨーク部材15aの内側7のフレーム幅Y方向
の中央部に内側溝10を形成し、 前記略三角形形状開口部5を形成するシャフト部材3
a,3bとヨーク部材15aの開口部側8の中央部に開
口部側溝11を形成したことを特徴とするラケットフレ
ーム。
1. A ball striking portion 2 including a ball striking member 2a and a yoke member 15a, shaft members 3a and 3b, and a yoke member 1.
In a fiber reinforced resin racket frame 1 formed by integrally forming a shaft portion 3 having a substantially triangular opening 5 formed by 5a and a grip portion 4 composed of a grip member 4a, the substantially triangular opening of the shaft portion 3 is provided. The portion 5 has an opening area of 70 cm 2 to 120 cm 2, and the internal angle h of the triangle formed by the straight lines E, F, and G circumscribing the opening 5 is 50 degrees to 70 degrees.
The ball striking member 2a, the yoke member 15a, and the shaft member 3
A frame composed of a and 3b is formed into an elliptical shape having a convex lens shape in cross section with a frame width Y as a major axis and a frame thickness X at a central portion as a minor axis, and the outer side 6 of the ball striking member 2a and the shaft members 3a, 3b. An outer groove 9 is formed in the center of the frame width Y direction, and an inner groove 10 is formed in the center of the inner side 7 of the ball striking member 2a and the yoke member 15a in the frame width Y direction. Shaft member 3 to be formed
A racket frame, characterized in that an opening-side groove 11 is formed in the center of the opening side 8 of the yoke members 15a and 3a.
【請求項2】 前記ラケットフレーム1の打球部材2a
と、シャフト部材3a,3bと、ヨーク部材15aのフ
レーム厚Xとフレーム幅Yの比率を、1:2.5乃至
1:3.5に設定形成したことを特徴とする請求項1記
載のラケットフレーム。
2. A ball striking member 2a of the racket frame 1.
The racket according to claim 1, wherein the ratio of the frame thickness X and the frame width Y of the shaft members 3a and 3b and the yoke member 15a is set to 1: 2.5 to 1: 3.5. flame.
JP5341555A 1993-12-09 1993-12-09 Racket frame Pending JPH07155407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5341555A JPH07155407A (en) 1993-12-09 1993-12-09 Racket frame

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5341555A JPH07155407A (en) 1993-12-09 1993-12-09 Racket frame

Publications (1)

Publication Number Publication Date
JPH07155407A true JPH07155407A (en) 1995-06-20

Family

ID=18346979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5341555A Pending JPH07155407A (en) 1993-12-09 1993-12-09 Racket frame

Country Status (1)

Country Link
JP (1) JPH07155407A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821756A1 (en) * 2001-03-12 2002-09-13 Rossignol Sa Tennis racket comprises frame, receiving stringing, and handle connected to frame by two branches with different mechanical properties
WO2018221267A1 (en) * 2017-05-31 2018-12-06 ヨネックス株式会社 Racket
AU2021266200B2 (en) * 2019-07-19 2023-05-11 Aerotec Power Pty Ltd Improved sporting articles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821756A1 (en) * 2001-03-12 2002-09-13 Rossignol Sa Tennis racket comprises frame, receiving stringing, and handle connected to frame by two branches with different mechanical properties
WO2018221267A1 (en) * 2017-05-31 2018-12-06 ヨネックス株式会社 Racket
AU2021266200B2 (en) * 2019-07-19 2023-05-11 Aerotec Power Pty Ltd Improved sporting articles

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