Ball for ball game and method for manufacturing the same
First Claim
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1. A ball for ball game comprising:
- a leather skin layer formed by sewing a plurality of leather panels by a thread, said leather skin layer having a spherical shape; and
a bladder made of an elastomer having a hollow spherical shape, said bladder being accommodated in said leather skin layer, said bladder being provided with a valve for feeding air into said rubber bladder, said bladder being charged with air through said valve;
wherein said thread is made of a self-shrink thread which is subjected to a shrinking treatment after sewing such that after shrinking, a high strength holding rate is provided binding said sewn leather panels of the leather skin layer of said ball to one another.
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Abstract
A ball for ball game comprising: a leather skin layer formed by sewing a plurality of leather panels by a thread, the leather skin layer having a spherical shape; and a bladder made of an elastomer having a hollow spherical shape, the bladder being accomodated in the leather skin layer, the bladder being provided with a valve for feeding air into the rubber bladder, the bladder being charged with air through the valve; wherein the thread is made of a self-shrink thread which is subjected to a shrinking treatment after sewing.
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Citations
14 Claims
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1. A ball for ball game comprising:
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a leather skin layer formed by sewing a plurality of leather panels by a thread, said leather skin layer having a spherical shape; and a bladder made of an elastomer having a hollow spherical shape, said bladder being accommodated in said leather skin layer, said bladder being provided with a valve for feeding air into said rubber bladder, said bladder being charged with air through said valve; wherein said thread is made of a self-shrink thread which is subjected to a shrinking treatment after sewing such that after shrinking, a high strength holding rate is provided binding said sewn leather panels of the leather skin layer of said ball to one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A ball for ball game comprising:
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a leather skin layer formed by sewing a plurality of leather panels by a thread, said leather skin layer having a spherical shape; and a bladder made of an elastomer having a hollow spherical shape, said bladder being accommodated in said leather skin layer, said bladder being provided with a valve for feeding air into said rubber bladder, said bladder being charged with air through said valve; wherein said thread is made of a self-shrink thread which shrinks by heating and which is subjected to a shrinking treatment after sewing such that after shrinking, a high strength holding rate is provided binding said sewn leather panels of the leather skin of said ball to one another with a tightening force which is greater than that with a sewn ball fabricated using a conventional non-shrink thread.
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14. A ball for ball game comprising:
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a leather skin layer formed by sewing a plurality of leather panels by a thread, said leather skin layer having a spherical shape; and a bladder made of an elastomer having a hollow spherical shape, said bladder being accommodated in said leather skin layer, said bladder being provided with a valve for feeding air into said rubber bladder, said bladder being charged with air through said valve; wherein said thread is made of a self-shrink thread which shrinks by absorbing water and which is subjected to a shrinking treatment after sewing such that after shrinking, a high strength holding rate is provided binding said sewn leather panels of the leather skins of said ball to one another with a uniform and powerful tightening force.
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Specification