JPH01110379A - Method for manufacturing bat of fiber-reinforced plastics - Google Patents
Method for manufacturing bat of fiber-reinforced plasticsInfo
- Publication number
- JPH01110379A JPH01110379A JP62269005A JP26900587A JPH01110379A JP H01110379 A JPH01110379 A JP H01110379A JP 62269005 A JP62269005 A JP 62269005A JP 26900587 A JP26900587 A JP 26900587A JP H01110379 A JPH01110379 A JP H01110379A
- Authority
- JP
- Japan
- Prior art keywords
- bat
- molding
- tube
- outer shell
- double
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 title abstract description 5
- 229920002430 Fibre-reinforced plastic Polymers 0.000 title 1
- 239000011151 fibre-reinforced plastic Substances 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012778 molding material Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract 2
- 238000000465 moulding Methods 0.000 abstract description 18
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 229920001971 elastomer Polymers 0.000 abstract description 2
- 239000005060 rubber Substances 0.000 abstract description 2
- 238000003475 lamination Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 7
- 239000003365 glass fiber Substances 0.000 description 7
- 239000002990 reinforced plastic Substances 0.000 description 5
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 241000288673 Chiroptera Species 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000010112 shell-mould casting Methods 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、野球やソフトボール等にしようするバットに
関し、設計の自由度が大きくしかも耐久性のあるバット
の製造方法に間するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bat used for baseball, softball, etc., and is directed to a method of manufacturing a bat that has a large degree of freedom in design and is durable. .
（従来の技術）
近年、強化プラスチックを用いた野球バットやソフトボ
ール用のバットの成形ではグリップ部、打球部等におい
て十分な強度を有し、品質的にもばらつきが少なくかつ
バランスのよいバットを得ることを目的として、様々な
構成のものが試みられている。(Prior art) In recent years, in the molding of baseball bats and softball bats using reinforced plastics, it has become possible to produce bats that have sufficient strength in the grip portion, ball hitting portion, etc., have little variation in quality, and are well-balanced. Various configurations have been tried to achieve this goal.
例えば第４図に示す特公昭４９−２８６１４に見られる
ように任意材の不均等な肉厚のチューブ１２を基体とし
て、強化プラスチック層６も打球による衝撃を受ける部
分は肉厚く、衝撃を直接受けない部分は肉薄く構成する
ように、内部を不均一の中空としたものや特開昭５３−
１９２３１に見られるように熱可塑性樹脂のバット形状
を有し、空気供給管設けた中空の芯材の外周に樹脂含浸
したガラス繊維を巻き付け、金型にて熱圧成型するとと
もに、圧縮空気を空気供給管より送入し、該芯材の外周
に巻き付けたガラス繊維を空気圧により金型に密着させ
、バットのＦＲＰ層を形成するものなどが公知となフて
いる。For example, as shown in the Japanese Patent Publication No. 49-28614 shown in Fig. 4, the reinforced plastic layer 6 is made of a tube 12 made of arbitrary material with uneven wall thickness as a base, and the part that receives the impact from the ball is thick, so that it directly receives the impact. In order to make the parts that are not there thinner, the inside is made unevenly hollow, and the JP-A-53-
As seen in 19231, it has a bat shape made of thermoplastic resin, and resin-impregnated glass fiber is wrapped around the outer periphery of a hollow core material provided with an air supply pipe, and the resin-impregnated glass fiber is molded using a mold under heat and pressure. It is known that the FRP layer of the bat is formed by introducing glass fibers from a supply pipe and wrapping them around the outer periphery of the core material, which is brought into close contact with a mold by air pressure.
（発明が解決しようとする問題点） これら従来の方法では、以下のような問題点があった。(Problem to be solved by the invention) These conventional methods have the following problems.
前者の、肉厚が不均一なチューブ１２を基体として、そ
の外周を強化プラスチック層でバット形状に形成し、内
部を不均等内径の中空として強化プラスチック層６も不
均等な肉厚としたものでは、該バットを成形するについ
てバット内部の中空部に、圧縮空気等を注入して内圧を
かける際、内部の形状が不均一であり、しかもチューブ
の肉厚も不均一であるため、チューブの厚い部分は内圧
によって広がりにくく、薄い部分に圧力が集中して破れ
ることなどもあ、り内圧が全体に均等に掛かりにくく、
該チューブの外周に繊維を配設する工程についても、形
状が複雑で配設するのに手間がかかり、コストが高くな
ることなどの欠点があった。また後者の熱可塑性合成樹
脂でバット形状の中空芯材を形成し、該芯材の外周にガ
ラス繊維を巻き付けて成形するものにあっては、中空芯
材を予め成形しておかなければならないことによりコス
トアップとなること、中空芯材は加熱されることにより
軟化し内圧がかかる程度の厚みにしなければならないこ
とから、おのずと厚みを薄くシなければならずそのため
、該芯材の外周にガラス繊維を巻き付ける際、十分な剛
性が得られないため、十分張力をかけて被覆できず、内
部でガラス繊維が皺になったりすることがある。また薄
い場合は破れやすく、したがフて内圧が均等にかかりに
＜＜ＦＲＰＮが均一な厚みにならなかったり、厚くした
場合にはガラス繊維層を構成する熱硬化性合成樹脂と中
空芯材を構成する熱可塑性合成樹脂は混合しにくく衝撃
による応力の集中を招き、そのためバットとしての強度
が低下するなどの欠点があった。In the former case, the tube 12 with uneven wall thickness is used as a base, the outer periphery is formed into a bat shape with a reinforced plastic layer, the inside is hollow with an uneven inner diameter, and the reinforced plastic layer 6 is also made with uneven wall thickness. When molding the bat, when applying internal pressure by injecting compressed air etc. into the hollow part inside the bat, the internal shape is uneven and the wall thickness of the tube is also uneven, so the tube is thick. Parts are difficult to spread due to internal pressure, and the pressure may concentrate on thin parts and cause them to tear, making it difficult for the internal pressure to be applied evenly to the entire part.
The process of arranging the fibers around the outer periphery of the tube also had drawbacks such as the complicated shape, time consuming and high cost. In addition, in the case of the latter, which is formed by forming a bat-shaped hollow core material from thermoplastic synthetic resin and wrapping glass fiber around the outer periphery of the core material, the hollow core material must be molded in advance. This increases the cost, and the hollow core material must be thick enough to soften when heated and apply internal pressure, so the thickness naturally has to be made thinner. When wrapping the glass fibers, sufficient rigidity may not be obtained, so sufficient tension may not be applied and the glass fibers may become wrinkled internally. Also, if it is thin, it will break easily, but if the internal pressure is applied evenly, the thickness of the FRPN will not be uniform, or if it is thick, the thermosetting synthetic resin and hollow core material that make up the glass fiber layer will break. The constituent thermoplastic synthetic resin is difficult to mix and causes concentration of stress due to impact, which has the disadvantage of reducing the strength of the bat.
（問題点を解決するための手段）
本発明はこれら従来の欠点に鑑み、設計の自°由度が大
きく、作業性に優°れ、しかも耐久性のあるバットを製
造する方法に関するものである。(Means for Solving the Problems) In view of these conventional drawbacks, the present invention relates to a method of manufacturing a bat that has a large degree of freedom in design, is excellent in workability, and is durable. .
本発明の特徴を図面に基づいて説明すれば、第１図に示
すように本発明のバット１は、予め略バット形状のマン
ドレルの外周にバット外殻成形用材料３を配設して、所
望のバット外形を有する成形型内４に配置し、該マンド
レルを抜き取った後、ゴム製または弾力性、可撓性に富
むプラスチックス製のチューブ２をバットの中空部に挿
入し、該チューブを基体として該チューブ内に圧縮空気
等５を注入し、該チューブを膨張させバット外殻成形用
材料を成形型に沿わせて防圧成形するバットの成形方法
において、該チューブ２は二枚に重ね合わせた二重チュ
ーブであることを特徴とするものである。To explain the characteristics of the present invention based on the drawings, as shown in FIG. After removing the mandrel, a tube 2 made of rubber or highly elastic and flexible plastic is inserted into the hollow part of the bat, and the tube is inserted into the base. In a bat molding method in which compressed air or the like 5 is injected into the tube to expand the tube and pressure-proof mold the bat outer shell molding material along the mold, the tube 2 is stacked in two pieces. It is characterized by being a double tube.
チューブの素材としては、天然ゴムやナイロン、ポリエ
ステル、ポリエチレン、ポリプロピレン、ポリ塩化ビニ
ール等の熱可塑性合成樹脂製のチューブの他、これらを
組み合わせてラミネートしたものなどでもよい。The material for the tube may be a tube made of thermoplastic synthetic resin such as natural rubber, nylon, polyester, polyethylene, polypropylene, or polyvinyl chloride, or a laminated combination of these materials.
（作用）
本発明の方法によれば、弾力性を有するチューブを基体
として中空のバットを成形するにあたり、該チューブを
二重としたことによりバット外殻成形用材料の粘着性等
により該成形材料に接する外側のチューブが破れる事が
あっても、圧縮空気が漏れるといった心配がない、また
、２枚重ねた厚みは、圧縮空気の圧力が十分効果的に利
用できる厚みであるのでバット外殻が不均一になるとい
った心配もない。(Function) According to the method of the present invention, when molding a hollow bat using an elastic tube as a base, by making the tube double, the adhesiveness of the bat outer shell molding material can be There is no need to worry about compressed air leaking even if the outer tube in contact with the bat is torn, and the thickness of the two layers is sufficient to effectively utilize the pressure of the compressed air. There is no need to worry about unevenness.
（発明の効果）
バットの形状は、打球部とグリップ部で太さが大きく異
なり（最大径部は、最小径部の約４倍はどになる）、チ
ューブをあまり厚くするとバット形状に広がりにくくな
り、余りに薄いと破れてしまうものであるが、本発明は
、内部圧力によフてバット外殻層を成型するにあたり、
バット成型の基体となるチューブを二重としたことから
、内部圧力が効果的に作用する厚みでありしかも、バッ
ト成形用材料に直接接する外側のチューブが該チューブ
の外周に配設する該成形用材料の樹脂などの粘着性によ
り破れたり、皺がよったりしても、金型に配置後圧縮空
気を送入し、熱圧成形時に圧縮空気圧が漏れて成形がう
まくいかなかったり、皺の為、金型で成形時にバット内
部の全体に均等に内圧がかからないといったことを防ぐ
ことができ、均一な厚みの耐久性の高いバットかえられ
るものである。基体となるチューブは硬化成形後除去す
るので、性質の違う樹脂を使用して樹脂の層ができ強度
の低下を招くといった心配もない。(Effect of the invention) The shape of the bat has a large difference in thickness between the ball hitting part and the grip part (the maximum diameter part is about 4 times as wide as the minimum diameter part), and if the tube is too thick, it will be difficult to spread out into the bat shape. However, in the present invention, when molding the bat outer shell layer using internal pressure,
Since the tube that serves as the base for bat molding is double-layered, it has a thickness that allows internal pressure to work effectively, and the outer tube that comes into direct contact with the bat molding material is placed around the outer periphery of the tube. Even if the material is torn or wrinkled due to the adhesiveness of the resin, compressed air can be supplied after placing it in the mold, and the compressed air pressure may leak during hot press molding, resulting in poor molding or wrinkles. It is possible to prevent internal pressure from being applied evenly to the entire inside of the bat during molding with a mold, and it is possible to replace a highly durable bat with a uniform thickness. Since the tube that serves as the base is removed after curing and molding, there is no need to worry about the use of resins with different properties, resulting in the formation of a resin layer and a decrease in strength.
第１図〜第３図は本発明の詳細な説明する図であり、第
４図は従来の１方法を示す図である。
ｌ・１１：バット、２串１２：チューブ、３：バリ
ット成隼用材料、４・１４二金型、５：圧縮空気、６：
強化プラスチック層1 to 3 are diagrams explaining the present invention in detail, and FIG. 4 is a diagram showing one conventional method. l・11: Bat, 2 skewers 12: Tube, 3: Material for barit maturation, 4・14 2 molds, 5: Compressed air, 6:
reinforced plastic layer
Claims (1)
外周にバット成形用材料を配設してバット形状の金型に
配置してのち、該チューブ内に、気体または液体を注入
し、内圧によりバット成形用材料を金型に密着し熱圧成
形するバットの製造方法において、該チューブは二重と
したことを特徴とするバットの製造方法。1 A tube made of any material having elasticity is used as a base, a bat molding material is arranged around its outer periphery, and it is placed in a bat-shaped mold, and then gas or liquid is injected into the tube and it is molded by internal pressure. 1. A bat manufacturing method in which a bat molding material is brought into close contact with a mold and hot-press molded, characterized in that the tube is double-layered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62269005A JPH0634845B2 (en) | 1987-10-24 | 1987-10-24 | Method for manufacturing fiber-reinforced plastic bat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62269005A JPH0634845B2 (en) | 1987-10-24 | 1987-10-24 | Method for manufacturing fiber-reinforced plastic bat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01110379A true JPH01110379A (en) | 1989-04-27 |
| JPH0634845B2 JPH0634845B2 (en) | 1994-05-11 |
Family
ID=17466340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62269005A Expired - Lifetime JPH0634845B2 (en) | 1987-10-24 | 1987-10-24 | Method for manufacturing fiber-reinforced plastic bat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0634845B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311845A (en) * | 2002-04-26 | 2003-11-06 | Honda Motor Co Ltd | Method for molding fiber-reinforced plastic component |
| US6949038B2 (en) * | 1999-09-15 | 2005-09-27 | Wilson Sporting Goods Co. | Ball bat having an insert with variable wall thickness |
| US7361106B1 (en) | 2005-05-23 | 2008-04-22 | Rawlings Sporting Goods Company, Inc. | Bat having a sleeve with slots |
| US7377867B1 (en) | 2005-05-23 | 2008-05-27 | Rawlings Sporting Goods Company, Inc. | Bat having a sleeve with holes |
| US7534179B1 (en) | 2005-05-23 | 2009-05-19 | Miken Sports, Llc | Bat having a sleeve with holes |
| US7749115B1 (en) | 2008-04-02 | 2010-07-06 | Rawlings Sporting Goods Company, Inc. | Bat with circumferentially aligned and axially segmented barrel section |
-
1987
- 1987-10-24 JP JP62269005A patent/JPH0634845B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6949038B2 (en) * | 1999-09-15 | 2005-09-27 | Wilson Sporting Goods Co. | Ball bat having an insert with variable wall thickness |
| JP2003311845A (en) * | 2002-04-26 | 2003-11-06 | Honda Motor Co Ltd | Method for molding fiber-reinforced plastic component |
| US7361106B1 (en) | 2005-05-23 | 2008-04-22 | Rawlings Sporting Goods Company, Inc. | Bat having a sleeve with slots |
| US7377867B1 (en) | 2005-05-23 | 2008-05-27 | Rawlings Sporting Goods Company, Inc. | Bat having a sleeve with holes |
| US7534179B1 (en) | 2005-05-23 | 2009-05-19 | Miken Sports, Llc | Bat having a sleeve with holes |
| US7534180B1 (en) | 2005-05-23 | 2009-05-19 | Miken Sports, Llc | Bat having a sleeve with slots |
| US7749115B1 (en) | 2008-04-02 | 2010-07-06 | Rawlings Sporting Goods Company, Inc. | Bat with circumferentially aligned and axially segmented barrel section |
| US7955200B1 (en) | 2008-04-02 | 2011-06-07 | Rawlings Sporting Goods Company, Inc. | Bat with circumferentially aligned and axially segmented barrel section |
| US8206250B1 (en) | 2008-04-02 | 2012-06-26 | Rawlings Sporting Goods Company, Inc. | Bat with circumferentially aligned and axially segmented barrel section |
| US8317640B1 (en) | 2008-04-02 | 2012-11-27 | Rawlings Sporting Goods Company, Inc. | Bat with circumferentially aligned and axially segmented barrel section |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0634845B2 (en) | 1994-05-11 |
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