String construction produced by subjecting a fibrous strand composed of fibrous materials having differing melting points to heating conditions sufficient to melt some but not all of the fibrous materials
AssigneeAshaway Line & Twine Mfg. Co.
InventorSteven J. Crandall
Life of this patent
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Abstract
An integrated string primarily for use in connection with athletic rackets, such as tennis, badminton, squash and the like, but also usable for fishing line, musical strings, etc., said string in one embodiment comprising a thermoplastic core having a thermoplastic sheath covering same and integrated thereto, said core material and said sheath comprising strands therein having substantially different melting points, and in a second embodiment said string consisting of a braided sheath, with no inner core, said sheath comprising thermoplastic strands having substantially different melting points.
Claims28
An integrated string construction resulting from the integration under heating conditions of a combination of elongated strands of first and second thermoplastic material, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said string having been integrated by the application of heat sufficient to melt said second material, but not said first material, said string, prior to integration, having compressed a core consisting at least in part of said second material, and a braided sheath over said core comprising strands of both said first and second materials.
An integrated string construction resulting from the integration under heating conditions of a combination of elongated strands of first and second thermoplastic material, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said string having been integrated by the application of heat sufficient to melt said second material, but not said first material, said string, prior to integration, having comprised a core consisting solely of said first material, and a braided sheath over said core comprising strands of both said first and second materials.
An integrated string construction resulting from the integration under heating conditions of a combination of elongated strands of first and second thermoplastic material, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said string having been integrated by the application of heat sufficient to melt said second material, but not said first material, said string, prior to integration, having consisted solely of a braid comprising strands of both said first and second materials.
An integrated string construction resulting from the integration under heating conditions of a combination of elongated strands of first and second thermoplastic material, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said string having been integrated by the application of heat sufficient to melt said second material, but not said first material, said string, prior to integration, having comprised a core consisting entirely of said second material, and a sheath consisting entirely of said first material surrounding said core.
An integrated string construction resulting from the integration under heating conditions of a combination of elongated strands of first and second thermoplastic material, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said string having been integrated by the application of heat sufficient to melt said second material, but not said first material, said string, prior to integration, having comprised a core consisting of a plurality of filamentous strands of said first material twisted together with one or more filamentous strands of said second material, and a sheath comprising at least in part said second thermoplastic material surrounding said core.
In an integrated string construction, a core comprising at least in part a first thermoplastic material, a sheath comprising at least in part a second thermoplastic material enveloping said core, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said sheath having been bonded to said core by the application of heat sufficient to melt the said second material but not said first material, said sheath, prior to integration, having consisted of a braided cover.
In an integrated string construction, a core comprising at least in part a first thermoplastic material, a sheath comprising at least in part a second thermoplastic material enveloping said core, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said sheath having been bonded to said core by the application of heat sufficient to melt the said second material but not said first material, said sheath, prior to integration, having consisted of a spirally wound cover.
In an integrated string construction, a core comprising at least in part a first thermoplastic material, a sheath comprising at least in part a second thermoplastic material enveloping said core, said first thermoplastic material having a substantially higher melting point than said second thermoplastic material, said sheath having been bonded to said core by the application of heat sufficient to melt the said second material but not said first material said string further comprising a cover (I) of said first material over said sheath, and a cover (II) of said second material thereover, said covers (I) and (II) having been bonded by the application of heat sufficient to melt said second material but not said first material.
The method of making an integrated racket string comprising the steps of forming an elongated braided sheath from strands of first and second thermoplastic material;
- said first material having a melting point substantially higher than that of said second material and then applying heat thereto sufficient to melt said second material but not said first material.
The method of making an integrated tennis string comprising the following steps:
- (a) forming a core by twisting together a plurality of filamentous strands of a first thermoplastic material with a plurality of filamentous strands of a second thermoplastic material characterized in that said first material has a substantially higher melting point than said second material;
- (b) integrating said strands by the application of heat sufficient to melt said second material, but not said first material;
- (c) applying a sheath comprising at least in part said second thermoplastic material over said core;
- (d) applying sufficient heat to said string to melt said second material, but not said first material.
The method of making an integrated string comprising the following steps:
- (a) forming a core of a first thermoplastic material;
- (b) applying a sheath comprising at least in part a second thermoplastic material over said core characterized in that said first material has a substantially higher melting point than said second material;
- (c) integrating said sheath and core by applying heat to said string sufficient to melt said second material, but not said first material.
Dependencies are inferred from the claim text.