JPH0335350Y2 - - Google Patents
Info
- Publication number
- JPH0335350Y2 JPH0335350Y2 JP1985099664U JP9966485U JPH0335350Y2 JP H0335350 Y2 JPH0335350 Y2 JP H0335350Y2 JP 1985099664 U JP1985099664 U JP 1985099664U JP 9966485 U JP9966485 U JP 9966485U JP H0335350 Y2 JPH0335350 Y2 JP H0335350Y2
- Authority
- JP
- Japan
- Prior art keywords
- frp
- frame
- racket frame
- racket
- outer shell
- 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.)
- Expired
Links
- 239000011162 core material Substances 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 17
- 239000012783 reinforcing fiber Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Description
【考案の詳細な説明】
[考案の技術分野]
この考案は、繊維強化プラスチツクス(以下、
FRPと略記する)を外殻としたテニスラケツト
等のラケツトフレームに関する。[Detailed description of the invention] [Technical field of the invention] This invention is based on fiber-reinforced plastics (hereinafter referred to as
This invention relates to a racket frame such as a tennis racket whose outer shell is FRP (abbreviated as FRP).
[従来技術とその問題点]
従来、この種のFRP外殻構造を有するラケツ
トフレームにおいては、第4図及び第5図に例示
するように、ラケツトフレーム本体1のフレーム
張弦部2の断面形状が、ポリウレタン樹脂、ポリ
エチレン樹脂等からなる発泡体またはハニカム材
といつたコア層3の周囲に、ガラス繊維、カーボ
ン繊維、ケブラーあるいはボロン繊維などを補強
繊維としたFRP層4を等厚に添設した閉断面構
造となつている。[Prior art and its problems] Conventionally, in a racket frame having this type of FRP outer shell structure, the cross-sectional shape of the frame stringing part 2 of the racket frame body 1 is However, around the core layer 3 made of foam or honeycomb material made of polyurethane resin, polyethylene resin, etc., an FRP layer 4 made of reinforcing fibers such as glass fiber, carbon fiber, Kevlar, or boron fiber is attached with equal thickness. It has a closed cross-sectional structure.
しかしながら、このような従来構造のラケツト
フレームにあつては、閉断面方向の全周が、厚さ
1.6mm程度の一枚の薄いFRP単独層になつている
ことから、特にガツトがUターン状に折返し張設
されるフレーム張弦部2の外周面部2a側の一辺
のFRP層4に働く実線矢印方向のガツトの張力
に対して剛性が不足し、充分な座屈強度が得られ
ず、抗張力及び弾性不足を招くといつた問題があ
つた。 However, in the case of a racket frame with such a conventional structure, the entire circumference in the closed cross-sectional direction is
Since it is made of a single thin FRP layer of about 1.6 mm, the direction of the solid line arrow that acts on the FRP layer 4 on one side of the outer peripheral surface 2a of the frame stringing section 2, where the strings are folded in a U-turn shape, is particularly strong. There was a problem that the rigidity was insufficient for the tension of the gut, and sufficient buckling strength could not be obtained, resulting in insufficient tensile strength and elasticity.
[考案の目的]
この考案は、上記の事情のもとになされたもの
で、その目的とするところは、軽量で、ガツト張
力に対する剛性を高め、かつ振動減衰特性の向上
を期待することができるラケツトフレームを提供
することにある。[Purpose of the invention] This invention was made under the above circumstances, and its purpose is to be lightweight, increase rigidity against gut tension, and improve vibration damping characteristics. Our goal is to provide racket frames.
[考案の概要]
上記した目的を達成させるために、この考案
は、外殻がFRPの閉断面からなるラケツトフレ
ームにおいて、該FRPは、閉断面方向の全周ま
たは一部に発泡芯材をFRP層間に介在させたサ
ンドイツチ構造にしてなる構成としたものであ
る。[Summary of the invention] In order to achieve the above-mentioned object, this invention is a racket frame whose outer shell is made of FRP with a closed cross section, in which the FRP has a foam core material on the entire circumference or part of the closed cross section. The structure consists of a sandwich structure interposed between FRP layers.
この場合、前記FRPは、フレーム周長方向の
全長または一部の長さをサンドイツチ構造にする
ことが好ましい。 In this case, it is preferable that the FRP has a sandwich structure over the entire length or part of the length in the circumferential direction of the frame.
[考案の実施例]
以下、この考案を第1図から第3図に示示す実
施例に基づいて説明する。なお、この考案に係る
図示の実施例において、第4図及び第5図に示す
従来構造と構成が重複する部分は同一符号を用
い、その説明は省略する。[Embodiments of the invention] This invention will be described below based on the embodiments shown in FIGS. 1 to 3. In the illustrated embodiment of this invention, the same reference numerals are used for the parts having the same structure as the conventional structure shown in FIGS. 4 and 5, and the explanation thereof will be omitted.
第1図はこの考案に係るラケツトフレームの第
1実施例を示すもので、ラケツトフレーム本体1
のフレーム張弦部2の外殻FRP層4を第1及び
第2のFRP層41,42で形成し、この両FRP
層41,42間に発泡芯材31を介在して閉断面
方向の全周がサンドイツチ構造を呈するようにし
て、フレーム周長方向の全長または一部長さに亘
つて形成したものである。 FIG. 1 shows a first embodiment of the racket frame according to this invention.
The outer shell FRP layer 4 of the frame stringing part 2 is formed of first and second FRP layers 41 and 42, and both FRP
A foamed core material 31 is interposed between the layers 41 and 42 so that the entire circumference in the closed cross-sectional direction exhibits a sandwich structure, and is formed over the entire length or a part of the length in the frame circumferential direction.
ところで、上記の構成からなるラケツトフレー
ムは、例えばフレーム張弦部2の外周面部2aに
おけるガツト張力に対する抗張力を考えた場合、
第1及び第2のFRP層41,42の厚さを0.8mm、
発泡芯材31の厚さを1.0mmとすると、第5図に
示す従来の1枚の厚さ1.6mmのFRP層によるもの
と比較して座屈強度は向上し、重量を増大させる
ことなく約2倍の剛性の向上が期待できるもので
あり、また、両FRP層41,42間に介在した
発泡芯材31によつて打球時の振動・衝撃の伝播
を著しく減衰させることが可能になる。 By the way, the racket frame having the above structure has, for example, when considering the tensile strength with respect to the string tension at the outer circumferential surface portion 2a of the frame stringing portion 2.
The thickness of the first and second FRP layers 41 and 42 is 0.8 mm,
If the thickness of the foam core material 31 is 1.0 mm, the buckling strength will be improved compared to the conventional one made of a single 1.6 mm thick FRP layer shown in Fig. 5, and the buckling strength will be approximately 1.0 mm without increasing the weight. It is expected that the rigidity will be doubled, and the foam core material 31 interposed between the FRP layers 41 and 42 can significantly attenuate the propagation of vibrations and shocks when the ball is hit.
さらに、第2図はこの考案に係る第2実施例を
示し、フレーム張弦部2の外周面部2a側の
FRP層4のみをサンドイツチ構造としてなる構
成を有するものである。 Furthermore, FIG. 2 shows a second embodiment according to this invention, in which the outer circumferential surface portion 2a side of the frame stringing portion 2 is
It has a structure in which only the FRP layer 4 has a sandwich structure.
さらにまた、第3図はこの考案に係る第3実施
例を示し、フレーム張弦部2の打球面側に面する
表裏両FRP層4をサンドイツチ構造としてなる
構成を有するものである。 Furthermore, FIG. 3 shows a third embodiment of this invention, in which both the front and back FRP layers 4 facing the ball-hitting surface side of the frame stringing section 2 have a sandwich structure.
なお、この考案の実施例においては、外殻
FRPをフレーム張弦部についてサンドイツチ構
造としたが、フレーム張弦部からシヤフト部及び
グリツプ部までの全長分に適用することも可能で
あることは勿論である。 In addition, in the embodiment of this invention, the outer shell
Although the FRP has a sandwich structure for the frame stringing part, it is of course possible to apply it to the entire length from the frame stringing part to the shaft part and grip part.
なお、上記例において、ラケツトフレームの外
殻構造を形成するFRPの強化用繊維の織編形態
としてはロービング、平織クロス、綾織クロス、
バイアスクロス等のいずれか1種又は2種以上併
合して使用可能であり、いずれの形態の種類の強
化用繊維を単独もしくは2種以上を複合し積層し
て使用した場合でも、この構造による効果を得る
ことが可能であり、更にその各種形態を採る強化
用繊維の材料の種類が、好ましくはカーボン又は
ガラス、高弾性率有機繊維をいずれか1種単独も
しくは2種以上を複合して使用した場合も同様に
有効である。また上記強化用繊維に含浸されるマ
トリツクス用合成樹脂は好ましくはエポキシ樹脂
又は不飽和ポリエステル樹脂又はエポキシアクリ
レート樹脂が好適に使用される。 In the above example, the weaving and knitting forms of the FRP reinforcing fibers forming the outer shell structure of the racket frame include roving, plain weave cloth, twill cloth,
Bias cloth etc. can be used alone or in combination of two or more types, and even if any type of reinforcing fiber is used alone or in a composite layered form of two or more types, the effect of this structure is Furthermore, the reinforcing fibers in various forms are preferably made of carbon, glass, or high modulus organic fibers, either alone or in combination of two or more. It is also valid in case. The matrix synthetic resin impregnated into the reinforcing fibers is preferably an epoxy resin, an unsaturated polyester resin, or an epoxy acrylate resin.
[考案の効果]
以上説明したように、この考案によれば、閉断
面方向の全周または一部の外殻FRPを、発泡芯
材がFRP層間に介在するサンドイツチ構造にし
てなることから、同一全厚の外殻FRPであつて
も、FRP層間のサンドイツチ効果により、剛性
及び座屈強度の向上を図ることができる。[Effects of the invention] As explained above, according to this invention, the entire circumference or part of the outer shell FRP in the closed cross-sectional direction is made into a sandwich structure in which the foam core material is interposed between the FRP layers. Even with a full-thickness outer shell FRP, the rigidity and buckling strength can be improved due to the sandwich effect between the FRP layers.
また、FRP層間の芯部が非強度部材で、かつ
FRP素材に比べて重量増加を無視できる発泡芯
材からなるために、重量を増大させることなく、
軽量化を期待することができるとともに、打球時
の振動減衰特性を向上させることができるという
すぐれた効果を有するものである。 In addition, if the core between the FRP layers is a non-strength material and
Since it is made of a foam core material that has a negligible weight increase compared to FRP materials, it can be used without increasing weight.
This has excellent effects in that it can be expected to be lighter in weight and can improve vibration damping characteristics when hitting a ball.
第1図はこの考案に係るラケツトフレームの第
1実施例を示すフレーム張弦部における断面図、
第2図はこの考案に係る第2実施例を示す断面
図、第3図はこの考案に係る第3実施例を示す断
面図、第4図は従来のラケツトフレームの一例を
示す説明図、第5図は第4図A−A線におけるフ
レーム張弦部の拡大断面図である。
1……ラケツトフレーム本体、2……フレーム
張弦部、2a……外周面部、4……FRP層、4
1,42……FRP層、31……発泡芯材。
FIG. 1 is a sectional view of a frame stringing part showing a first embodiment of a racket frame according to this invention;
FIG. 2 is a sectional view showing a second embodiment of this invention, FIG. 3 is a sectional view of a third embodiment of this invention, and FIG. 4 is an explanatory diagram showing an example of a conventional racket frame. FIG. 5 is an enlarged sectional view of the frame stringing section taken along the line A-A in FIG. 4. 1... Racket frame body, 2... Frame stringing part, 2a... Outer peripheral surface part, 4... FRP layer, 4
1, 42...FRP layer, 31...foam core material.
Claims (1)
ームにおいて、 該FRPは、閉断面方向の全周または一部に
発泡芯材をFRP層間に介在させたサンドイツ
チ構造にしたことを特徴とするラケツトフレー
ム。 (2) 前記FRPは、フレーム周長方向の全長をサ
ンドイツチ構造にしたことを特徴とする実用新
案登録請求の範囲第1項に記載のラケツトフレ
ーム。 (3) 前記FRPは、フレーム周長方向の一部の長
さをサンドイツチ構造にしたことを特徴とする
実用新案登録請求の範囲第1項に記載のラケツ
トフレーム。[Claims for Utility Model Registration] (1) In a racket frame whose outer shell is made of FRP with a closed section, the FRP is a sandwich frame with a foam core material interposed between the FRP layers all or part of the circumference in the direction of the closed section. A racket frame characterized by its structure. (2) The racket frame according to claim 1, wherein the FRP has a sandwich structure over the entire length in the circumferential direction of the frame. (3) The racket frame according to claim 1, wherein the FRP has a sandwich structure for a part of the length in the circumferential direction of the frame.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1985099664U JPH0335350Y2 (en) | 1985-06-28 | 1985-06-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1985099664U JPH0335350Y2 (en) | 1985-06-28 | 1985-06-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS626861U JPS626861U (en) | 1987-01-16 |
JPH0335350Y2 true JPH0335350Y2 (en) | 1991-07-26 |
Family
ID=30968752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1985099664U Expired JPH0335350Y2 (en) | 1985-06-28 | 1985-06-28 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0335350Y2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6020260B2 (en) * | 1977-01-17 | 1985-05-21 | ミノルタ株式会社 | Anti-fog device for transparent windows in waterproof cases |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5824774Y2 (en) * | 1977-09-14 | 1983-05-27 | 松下電器産業株式会社 | Microtorque meter for rotating bodies |
JPS5666361U (en) * | 1979-10-27 | 1981-06-03 | ||
JPS6020260U (en) * | 1983-07-18 | 1985-02-12 | ヨネツクス株式会社 | racket frame |
-
1985
- 1985-06-28 JP JP1985099664U patent/JPH0335350Y2/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6020260B2 (en) * | 1977-01-17 | 1985-05-21 | ミノルタ株式会社 | Anti-fog device for transparent windows in waterproof cases |
Also Published As
Publication number | Publication date |
---|---|
JPS626861U (en) | 1987-01-16 |
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