JP5757702B2 - 野球ボール - Google Patents
野球ボール Download PDFInfo
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- JP5757702B2 JP5757702B2 JP2010176297A JP2010176297A JP5757702B2 JP 5757702 B2 JP5757702 B2 JP 5757702B2 JP 2010176297 A JP2010176297 A JP 2010176297A JP 2010176297 A JP2010176297 A JP 2010176297A JP 5757702 B2 JP5757702 B2 JP 5757702B2
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- baseball
- core
- coefficient
- inner core
- restitution
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- 238000006243 chemical reaction Methods 0.000 claims description 51
- 230000002093 peripheral effect Effects 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000006260 foam Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 241000226585 Antennaria plantaginifolia Species 0.000 claims 1
- 239000011162 core material Substances 0.000 description 199
- 239000010410 layer Substances 0.000 description 31
- 230000000052 comparative effect Effects 0.000 description 26
- 230000006835 compression Effects 0.000 description 18
- 238000007906 compression Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 13
- 238000005259 measurement Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- 239000010985 leather Substances 0.000 description 7
- 238000010998 test method Methods 0.000 description 5
- 230000002596 correlated effect Effects 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 239000002649 leather substitute Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000003190 viscoelastic substance Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/02—Special cores
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
-
- 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
- A63B2102/18—Baseball, rounders or similar games
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
- A63B37/004—Physical properties
- A63B37/0045—Thickness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0038—Intermediate layers, e.g. inner cover, outer core, mantle
- A63B37/004—Physical properties
- A63B37/0049—Flexural modulus; Bending stiffness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0061—Coefficient of restitution
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0064—Diameter
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0069—Flexural modulus; Bending stiffness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0074—Two piece balls, i.e. cover and core
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0075—Three piece balls, i.e. cover, intermediate layer and core
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0076—Multi-piece balls, i.e. having two or more intermediate layers
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Laminated Bodies (AREA)
Description
図1を参照して、本発明の一実施の形態の野球ボール1は、内芯2と、外芯3と、外層4とを主に有している。野球ボール1の中心部には内芯2が配置されている。内芯2の外周面が外芯3で覆われている。外芯3の外周面が外層4で覆われている。内芯2および外芯3の材料は、たとえば発泡ウレタンである。
なお、上記の変形例1と同様に糸巻層5が設けられていてもよい。この場合、糸巻層5では外芯3の外周面を覆うように糸が巻かれている。
発明者等は動的粘弾性の損失係数(tanδ)が反発係数と相関があることを見出し、弾性率が衝撃力と相関があることを見出した。また、発明者等は内芯2および外芯3の割合によって衝撃力および反力と反発係数とが変化することを見出した。
まず、芯に使用する材料の特性を求めるために、落下衝撃によるSS曲線と粘弾性試験による粘弾性値を用いてCAE(Computer Aided Engineering)解析を行った。
ESI株式会社製の解析ソフトウェアPAM CRASHで解析した反発係数の値である。
表4に示す試料1〜7について、図11〜図16を参照して、反発係数、衝撃力、弾性率、複素弾性率、tanδ(損失係数)の関係について検討した。tanδは、上記複素弾性率E*の貯蔵弾性率E’と損失弾性率E"との比である。
Claims (5)
- 内芯と、前記内芯の外周面を覆う外芯とを有する野球ボールであって、
14.14mm以上56.56mm以下の外径を有し、かつ弾性率が1.0MPa以上1.3MPa以下であり、動的粘弾性の損失係数(tanδ)が0.10以上0.20以下であり、反発係数が0.5以上の発泡ウレタンからなる前記内芯と、
7.07mm以上28.28mm以下の厚みに形成されており、かつ弾性率が0.6MPa以上1.0MPa以下であり、動的粘弾性の損失係数(tanδ)が0.26以上0.30以下であり、発泡ウレタンからなる前記外芯とを備えた、野球ボール。 - 前記野球ボールの前記内芯および前記外芯が26.82m/sの速度で衝突した際の反力が4300N以下である、請求項1に記載の野球ボール。
- 前記野球ボールが26.82m/sの速度で鉄板に衝突した際の反発係数が0.50以上である、請求項1または2に記載の野球ボール。
- 前記反発係数が0.55以下であり、かつ前記野球ボールの外径を6.35mm圧縮した際の荷重が45lbf未満である、請求項3に記載の野球ボール。
- 内芯と、前記内芯の外周面を覆う外芯とを有する野球ボールであって、
前記内芯の弾性率が1.0MPa以上1.3MPa以下であり、かつ前記内芯の動的粘弾性の損失係数(tanδ)が0.10以上0.20以下であり、かつ前記内芯の直径が34mmであり、発泡ウレタンからなる前記内芯と、
前記外芯の弾性率が0.6MPa以上1.0MPa以下であり、かつ前記外芯の動的粘弾性の損失係数(tanδ)が0.26以上0.30以下であり、発泡ウレタンからなる前記外芯と、
前記外芯の外周面を覆うように糸が巻かれた糸巻層と、
前記糸巻層の外周面を覆う外層とを備え、
前記野球ボールの前記内芯および前記外芯の外径が70.7mmである、野球ボール。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010176297A JP5757702B2 (ja) | 2010-08-05 | 2010-08-05 | 野球ボール |
US13/198,205 US8882617B2 (en) | 2010-08-05 | 2011-08-04 | Baseball |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010176297A JP5757702B2 (ja) | 2010-08-05 | 2010-08-05 | 野球ボール |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2012034773A JP2012034773A (ja) | 2012-02-23 |
JP2012034773A5 JP2012034773A5 (ja) | 2013-08-08 |
JP5757702B2 true JP5757702B2 (ja) | 2015-07-29 |
Family
ID=45556548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2010176297A Expired - Fee Related JP5757702B2 (ja) | 2010-08-05 | 2010-08-05 | 野球ボール |
Country Status (2)
Country | Link |
---|---|
US (1) | US8882617B2 (ja) |
JP (1) | JP5757702B2 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012200270A (ja) * | 2011-03-23 | 2012-10-22 | Mizuno Corp | 野球ボール |
JP5843845B2 (ja) * | 2013-12-28 | 2016-01-13 | 美津濃株式会社 | 硬式野球用ボール |
US20180333613A1 (en) * | 2017-05-16 | 2018-11-22 | Michael Butcher | Youth baseball |
JP6641433B2 (ja) * | 2017-08-24 | 2020-02-05 | 一般社団法人レッシュ・プロジェクト | トレーニングボール |
US10159874B1 (en) * | 2018-01-12 | 2018-12-25 | Blackstar Corp. | Luminous ball |
JP7269598B2 (ja) * | 2019-02-28 | 2023-05-09 | 努 神事 | 硬式野球用ボール |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2278649A (en) * | 1940-08-03 | 1942-04-07 | Spalding A G & Bros Inc | Ball |
US4454253A (en) * | 1983-09-19 | 1984-06-12 | Atlantic Richfield Co. | Polyurethane foam game ball, composition and process |
US4660830A (en) * | 1985-01-24 | 1987-04-28 | Home Of Champions, S.A. | Baseball or softball |
US5647590A (en) * | 1994-11-21 | 1997-07-15 | Lisco, Inc. | Game ball for urban use |
US5951420A (en) * | 1997-05-09 | 1999-09-14 | Jas. D. Easton, Inc. | Safety ball |
US6369125B1 (en) * | 1999-12-23 | 2002-04-09 | Spalding Sports Worldwide, Inc. | Game balls with cover containing post crosslinkable thermoplastic polyurethane and method of making same |
JP2002210043A (ja) * | 2001-01-24 | 2002-07-30 | Mizuno Corp | 硬式野球用ボール |
AU2003258028A1 (en) * | 2002-08-05 | 2004-02-23 | Sgg Patents Llc | Multi-layer softball |
US6653363B1 (en) * | 2002-12-04 | 2003-11-25 | Foamex, L.P. | Low energy-loss, high firmness, temperature sensitive polyurethane foams |
-
2010
- 2010-08-05 JP JP2010176297A patent/JP5757702B2/ja not_active Expired - Fee Related
-
2011
- 2011-08-04 US US13/198,205 patent/US8882617B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US20120035008A1 (en) | 2012-02-09 |
US8882617B2 (en) | 2014-11-11 |
JP2012034773A (ja) | 2012-02-23 |
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