String for a racket
First Claim
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1. A racket, comprising:
- a racket frame; and
a cord netting stretched in said frame;
said cord netting consisting of a string that is composed of;
a base core formed as at least a first filament;
an intermediate layer formed from a plurality of second filaments and enclosing said base core; and
a first sheath layer enclosing said intermediate layer, at least one of said first filament and said second filaments having a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over said toothed core so as to be bonded to said toothed outer surface, said first plastic material having a hardness and a wear-resistance less than those of said second plastic material, wherein said first filament is in the form of said molded structure and each of said second filaments is made of a third plastic material that is selected from a group consisting of polyester, nylon, thermoplastic polyurethane, and polyaryletherketone, and wherein said base core is formed as a bundle of said first filaments, each of which is in the form of said molded structure, said intermediate layer including a first set of said second filaments which are twisted about said first filaments in a first direction, and a second set of said second filaments which are twisted about said first filaments in a second direction that is opposite to said first direction, said first and second sets of said second filaments being interlaced and being disposed in annular rows surrounding said first filaments.
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Abstract
A string for a sports racket includes a base core formed from at least a first filament, an intermediate layer formed from a plurality of second filaments and enclosing the base core, and a first sheath layer enclosing the intermediate layer. At least one of the first filament and the second filaments has a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over the toothed core. The first plastic material has a hardness and a wear-resistance less than those of the second plastic material.
14 Citations
12 Claims
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1. A racket, comprising:
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a racket frame; and
a cord netting stretched in said frame;
said cord netting consisting of a string that is composed of;
a base core formed as at least a first filament;
an intermediate layer formed from a plurality of second filaments and enclosing said base core; and
a first sheath layer enclosing said intermediate layer, at least one of said first filament and said second filaments having a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over said toothed core so as to be bonded to said toothed outer surface, said first plastic material having a hardness and a wear-resistance less than those of said second plastic material,wherein said first filament is in the form of said molded structure and each of said second filaments is made of a third plastic material that is selected from a group consisting of polyester, nylon, thermoplastic polyurethane, and polyaryletherketone, and wherein said base core is formed as a bundle of said first filaments, each of which is in the form of said molded structure, said intermediate layer including a first set of said second filaments which are twisted about said first filaments in a first direction, and a second set of said second filaments which are twisted about said first filaments in a second direction that is opposite to said first direction, said first and second sets of said second filaments being interlaced and being disposed in annular rows surrounding said first filaments. - View Dependent Claims (2, 3, 4)
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5. The racket comprising:
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a racket frame; and
a cord netting stretched in said frame;
said cord netting consisting of a string that is composed of;
a base core formed as at least a first filament;
an intermediate layer formed from a plurality of second filaments and enclosing said base core; and
a first sheath layer enclosing said intermediate layer, at least one of said first filament and said second filaments having a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over said toothed core so as to be bonded to said toothed outer surface, said first plastic material having a hardness and a wear-resistance less than those of said second plastic material, andwherein the toothed outer surface of the toothed core comprises teeth having a base width which is greater than a height of the teeth.
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6. A string for a racket, comprising:
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a base core formed from at least a first filament;
an intermediate layer formed from a plurality of second filaments and enclosing said base core; and
a first sheath layer enclosing said intermediate layer;
at least one of said first filament and said second filaments having a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over said toothed core so as to be bonded to said toothed outer surface, said first plastic material having a hardness and a wear-resistance less than those of said second plastic material, wherein said first filament is in the form of said molded structure and each of said second filaments is made of a third plastic material that is selected from a group consisting of polyester, nylon, thermoplastic polyurethane, and polyaryletherketone, and wherein said base core is formed as a bundle of said first filaments, each of which is in the form of said molded structure, said intermediate layer including a first set of said second filaments which are twisted about said first filaments in a first direction, and a second set of said second filaments which are twisted about said first filaments in a second direction that is opposite to said first direction, said first and second sets of said second filaments being interlaced and being disposed in annular rows surrounding said first filaments. - View Dependent Claims (7, 8, 9, 10)
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11. A string for a racket, comprising:
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a base core formed from at least a first filament;
an intermediate layer formed from a plurality of second filaments and enclosing said base core; and
a first sheath layer enclosing said intermediate layer;
at least one of said first filament and said second filaments having a molded structure which includes a toothed core that is made of a first plastic material and that has a toothed outer surface, and a second sheath layer that is made of a second plastic material and that is molded over said toothed core so as to be bonded to said toothed outer surface, said first plastic material having a hardness and a wear-resistance less than those of said second plastic material, and wherein the toothed outer surface of the toothed core comprises teeth having a base width which is greater than a height of the teeth.
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12. A string for a racket, comprising:
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a longitudinally extending core formed from at least a first filament;
an intermediate layer defined by a plurality of second filaments enclosing the longitudinally extending core; and
a first sheath layer enclosing the intermediate layer;
wherein at least one of the first filament and the second filaments has a toothed core made of a first plastic material and having an outer surface formed by teeth each having a base width which is greater than a height of the tooth, and a second sheath layer made of a second plastic material and molded over the toothed core.
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Specification