US20010000507A1 - Ball for baseball - Google Patents

Ball for baseball Download PDF

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Publication number
US20010000507A1
US20010000507A1 US09/729,977 US72997700A US2001000507A1 US 20010000507 A1 US20010000507 A1 US 20010000507A1 US 72997700 A US72997700 A US 72997700A US 2001000507 A1 US2001000507 A1 US 2001000507A1
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United States
Prior art keywords
ball
balls
layer
baseball
resin
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.)
Abandoned
Application number
US09/729,977
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English (en)
Inventor
Haruo Uchida
Koji Uchida
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Individual
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Individual
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Publication date
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Publication of US20010000507A1 publication Critical patent/US20010000507A1/en
Abandoned 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
    • 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
    • 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
    • A63B37/12—Special coverings, i.e. outer layer material
    • 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

Definitions

  • This invention relates to a ball used in baseball.
  • Balls used in pro baseball, high school baseball, etc. are formed, as shown in FIG. 2, by providing a layer 3 of woolen yarn around a rubber core 2 having a baked cork 1 inside and, around the layer 3 an outermost layer 5 of cowhide through a layer 4 comprising cotton yarn.
  • the cowhide of the outermost layer is liable to be damaged and deformed due to shocks upon batting. Since the cowhide is not uniform in density, strength and restoring force, every time batting is repeated, protrusions or recesses tend to be formed and restoring such protrusions and recesses is difficult. Therefore the life of balls is not so long. Further, the stitched portion of the cowhide is the weakest part in strength. Thus, if a shock upon batting is repeatedly given to this portion, the string may be cut or cowhide therearound may break, thus making the ball unusable.
  • top balls and practice balls having their outermost layers covered with resin are known.
  • a top ball has, as shown in FIG. 3, a baked cork layer 7 provided around a foamed polyurethane core 6 , and a resin elastomer layer 8 provided around the layer 7 .
  • a practice ball is a ball for baseball for practice in the rain, and is provided, as shown in FIG. 4, with a resin elastomer layer 10 on the outer periphery of a core layer 9 of a baked cork.
  • top balls are not accepted for ordinary baseball.
  • weights of top balls and practice balls are heavy compared with ordinary balls.
  • these balls give wired feelings to players who use them, so that they are rarely used as an alternative for ordinary balls for baseball.
  • the ratio of the density of the outer peripheral portion of such top balls and practice balls to that of the core is larger than that of ordinary balls.
  • top balls and practice balls are large in the resilience and repulsion of the resin elastomer layer of the outermost layer compared with ordinary balls, flying distance by batting tends to be prolonged and the bound tends to be large.
  • the thickness of the outermost layer decreases, so that the strength of the outermost layer decreases correspondingly.
  • the resin elastomer of the outermost layer may be heat-deformed, seize or break. Thus, waterproofness will be lost.
  • An object of this invention is to provide a ball for baseball having properties similar to those of ordinary balls and superior in waterproofness.
  • a ball for baseball comprising a baked cork, a rubber core around the baked cork, a layer of woolen yarn around the rubber core, a layer of cotton yarn around the layer of woolen yarn, and an outermost layer provided around the layer of cotton yarn, the outermost layer being formed from a water-impermeable resin and the total weight of the ball being 142 to 148 g.
  • the total weight of the ball and the density ratio between the core portion and the outer peripheral portion are equal to conventional balls, and also there will be no difference in change due to spinning of balls. Further, since the outermost layer of the ball is formed from a water-impermeable resin, it has waterproofness and it is possible to suppress deterioration of the ball due to infiltration of water and variation in the weight of the ball.
  • this ball can be repeatedly used at least 2500 times in a machine test in which using a two-wheel type pitching machine having two urethane wheels, the ball is thrown at an initial velocity of 130 km/h.
  • FIG. 1 is a sectional view showing an embodiment of the ball according to this invention.
  • FIG. 2 is a sectional view showing a conventional ball
  • FIG. 3 is a sectional view of a top ball
  • FIG. 4 is a sectional view of a practice ball.
  • the ball for baseball according to this invention (hereinafter referred to as a “new ball”) has, as shown in FIG. 1, a layer 13 of woolen yarn provided around a rubber core 12 having a baked cork 11 inside, and a layer 15 as the outermost layer formed of a water-impermeable resin through a layer 14 of cotton yarn.
  • the total weight of this new ball is 142 to 148 g.
  • This is the same as the standard for balls normally used in pro baseball and having the outermost layer formed from cowhide (hereinafter referred to as “conventional balls”) as shown in FIG. 2.
  • the rubber core 12 having the baked cork 11 , woolen yarn layer 13 and cotton yarn layer 14 are the same as those of the conventional balls. That is, the rubber core having baked cork, woolen yarn and cotton yarn used in pro baseball are used in the new ball, too.
  • the new ball is similar to conventional balls.
  • the water-impermeable resin layer 15 of the new ball and the cowhide of the conventional ball have the same weights.
  • the thickness of the water-impermeable resin layer 15 used is limited.
  • the total weight of the new ball is equal to that of the conventional ball, so that it can be a substitute for the conventional ball.
  • the density ratio between the core portion and the outer peripheral portion of the new ball is equal to that of the conventional ball, so that there will be no difference in change due to spinning of the balls.
  • the outermost layer of the new ball comprises the water-impermeable resin layer 15 .
  • the new ball has waterproofness and can withstand use in the rain. Also, since the density, strength and restoring force are uniform at any part of the water-impermeable resin layer 15 , even after batting is repeated, protrusions and recesses are less likely to be formed.
  • this new ball has durability in a machine test.
  • the machine test is a test for measuring how many times the ball can be used repeatedly, by use of a two-wheel type pitching machine having two urethane wheels. It is preferable that the ball can be repeatedly used at least 2500 times when the ball is thrown at an initial velocity of 130 km/h. It is more preferable that it can be repeatedly used at least 3000 times. It is still more preferable that it can be repeatedly used at least 4000 times. The reason why it can be used so many times is because in spite of a limited thickness of the water-impermeable resin layer 15 used in the new ball, it is a material that is less likely to develop damage, breakage, heat deformation, seizure, etc. Thus, the life of the new ball is prolonged dramatically compared with the conventional ball.
  • Hardness is, in the type A measurement under JIS K 7311, preferably 60 to 100, and more preferably 80 to 100. Under 60, it tends to be deformed by shocks. Over 100, it is too hard and players cannot obtain a feeling similar to the conventional ball.
  • Breaking strength is, in the measurement under JIS K 7311, preferably 40 to 100 MPa, and more preferably 50 to 100 MPa. Under 40 MPa, damage may develop or breakage occur in the outermost layer. Although it may exceed 100 MPa, there is no particular need for such high-performance.
  • Taper wear is, in the measurement under JIS K 7311, preferably over 0 mg and 15 mg or under, and more preferably 0.1 mg or over and 10 mg or under, and still more preferably 0.1 mg or over and 1 mg or under. Over 15 mg, damage may develop or breakage may occur in the outermost layer.
  • Softening temperature is, in the measurement under JIS K 7206, preferably 80 to 300°C., more preferably 90 to 300°C., and still more preferably 105 to 300° C. Under 80° C., seizure tends to occur during the use of a pitching machine. Although it may exceed 300°C., there is no particular need for such high performance.
  • thermoplastic resins and thermosetting resins such as polyethylene, polypropylene, polystyrene, polyamide resin, epoxy resin, thermoplastic polyurethane resin, polyester resin, vinyl acetate resin, ABS resin and acrylic resin, and elastomers of thermoplastic resins can be cited.
  • polyamide resin, epoxy resin, thermoplastic polyurethane resin, polyamide elastomers, thermoplastic polyurethane vulcanized elastomers, etc. are more preferable, and thermoplastic polyurethane resin and thermoplastic polyurethane vulcanized elastomers are particularly preferable.
  • water-impermeable resin layer 15 a resin itself may be used or it may be used in the form of synthetic leather or artificial leather.
  • the method of providing the water-impermeable resin layer 15 as the outermost layer injection molding using a mold, or bonding synthetic leather or artificial leather portions together to cover as the outermost layer and fusing its boundary with the same resin can be adopted. Since the new ball of this invention has no seam, no portion that is weak in strength is formed. Thus there will be no cutting of stitch yarn due to batting or breakage of the outermost layer therearound. Thus, the life as the ball is prolonged.
  • the average weight of 10 balls obtained was 146 grams and all the balls were within the range of 142 to 148 grams.
  • the hardness (JIS K 7311 Type A) of the thermoplastic polyurethane resin used was 90, breaking hardness (JIS K 7311) was 57 MPa, taper wear (JIS K 7311) was 1 mg, and the softening temperature (JIS K 7206) was 116° C.
  • thermoplastic polyurethane resin (Clarino made by KURARAY Co.,Ltd.) was used as the resin for the outermost layer, balls were manufactured in the same manner as in Manufacturing Example 1.
  • the average weight of 10 balls obtained was 146 grams and all the balls were within the range of 142 to 148 grams.
  • the hardness (JIS K 7311 Type A) of the thermoplastic polyurethane resin used was 90, breaking hardness (JIS K 7311) was 57 MPa, taper wear (JIS K 7311) was 35 mg, and softening temperature (JIS K 7206) was 93° C.
  • the balls obtained are less likely to develop damage or breakage on the surface, and heat deformation or seizure in the balls themselves, so that it is possible to prolong the life of the balls.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Paints Or Removers (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
US09/729,977 1998-07-21 2000-12-06 Ball for baseball Abandoned US20010000507A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10-205322 1998-07-21
JP10205322A JP2000037479A (ja) 1998-07-21 1998-07-21 硬式野球用ボール

Publications (1)

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US20010000507A1 true US20010000507A1 (en) 2001-04-26

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US09/729,977 Abandoned US20010000507A1 (en) 1998-07-21 2000-12-06 Ball for baseball

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JP (1) JP2000037479A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8771114B2 (en) 2011-07-06 2014-07-08 Wilson Sporting Goods Co. Baseball with improved core and enhanced durability
US9101800B2 (en) 2011-07-08 2015-08-11 Rawlings Sporting Goods Company, Inc. Molded game ball
US20170291074A1 (en) * 2014-12-26 2017-10-12 Xiamen Zaifeng Sporting Equipment Co., Ltd. Baseball/softball, method of processing thereof and material formula of baseball/softball cover
KR20190079967A (ko) * 2017-12-28 2019-07-08 강수연 연습용 야구공

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5202466B2 (ja) * 2009-07-27 2013-06-05 帝人コードレ株式会社 野球ボール用表皮材
KR101254093B1 (ko) 2010-09-09 2013-04-12 친-첸 호 야구공

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8771114B2 (en) 2011-07-06 2014-07-08 Wilson Sporting Goods Co. Baseball with improved core and enhanced durability
US9101800B2 (en) 2011-07-08 2015-08-11 Rawlings Sporting Goods Company, Inc. Molded game ball
US10058743B2 (en) 2011-07-08 2018-08-28 Rawlings Sporting Goods Company, Inc. Molded game ball
US20170291074A1 (en) * 2014-12-26 2017-10-12 Xiamen Zaifeng Sporting Equipment Co., Ltd. Baseball/softball, method of processing thereof and material formula of baseball/softball cover
US9999810B2 (en) * 2014-12-26 2018-06-19 Xiamen Zaifeng Sporting Equipment Co., Ltd. Baseball/softball and method of processing thereof
KR20190079967A (ko) * 2017-12-28 2019-07-08 강수연 연습용 야구공
KR102024441B1 (ko) * 2017-12-28 2019-09-23 강수연 연습용 야구공

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