Gut for racket

• US 4,084,399 A
• Filed: 08/23/1976
• Issued: 04/18/1978
• Est. Priority Date: 03/31/1976
• Status: Expired due to Term

• Current Assignee: Nippon Carbon Kabushiki Kaisha
• Original Assignee: Nippon Carbon Kabushiki Kaisha
• Inventors: Nishimoto, Takafumi, Kanemaru, Toyonosuke, Hisatomi, Yukuo
• Primary Examiner(s): Queisser, Richard C.
• Assistant Examiner(s): Gorenstein, Charles
• Application Number:
  US05/716,685
• Time in Patent Office: 603 Days
• Field of Search: 57/139, 57/149, 57/140 R, 57/140 C, 57/140 BY, 57/153, 428/367, 428/368, 428/375, 428/378, 428/388, 428/389, 428/392, 428/394
• US Class Current: 57/232
• CPC Class Codes: A63B 51/02 Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear
• CPC Class Codes: D02G 3/02 Yarns or threads characterised by the material or by the materials from which they are made
• CPC Class Codes: D02G 3/404 Yarns or threads coated with polymeric solutions
• CPC Class Codes: D02G 3/444 Yarns or threads for use in sports applications strings for tennis rackets A63B51/02
• CPC Class Codes: Y10S 273/23 High modulus filaments
• CPC Class Codes: Y10T 428/2918 including free carbon or carbide or therewith [not as steel]
• CPC Class Codes: Y10T 428/2958 Metal or metal compound in coating

Abstract

A gut is provided for a sports racket such as a tennis racket. The gut is made with carbon fibers. The gut may be made solely of carbon fibers or there may be a combination of carbon fibers and organic and/or inorganic fibers. A coating may be provided for the resultant product which may be a synthetic resin or metallic. The carbon fiber is above 150 kg/mm² in tensile strength.

Claims

1. A gut for a racket comprising a combination of carbon fibers and organic fibers, and synthetic resin mixed with said carbon fibers which are in the form of chopped carbon fiber filaments.

2. A gut for a racket as claimed in claim 1, wherein the gut is composed of a combination of said carbon fibers, organic fibers and inorganic fibers.

3. A gut for a racket as claimed in claim 1, comprising aluminum, copper, tin or an alloy thereof as a coating.

4. A gut for a racket as claimed in claim 1, comprising a synthetic resin as a coating material.

5. A gut for a racket as claimed in claim 1, wherein said organic fibers and said synthetic resin are made of nylon.

6. A gut for a racket comprising a combination of carbon fibers and synthetic fibers and at least one of the two kinds of fibers is twisted to produce a combined fiber gut having a substantially linear relation between tensile modulus and elongation and wherein the modulus value ranges from about 260 Kg./gut to about 290 Kg./gut.

7. A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of multifilaments and the synthetic fibers are in the form of mono or multifilaments, the two kinds of filaments being twisted together.

8. A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of untwisted or twisted multifilaments and the synthetic fibers are in the form of a monofilament or untwisted or twisted multifilaments, and at least one of the synthetic fiber monofilament or multifilaments being used as a core and at least one of the carbon multifilaments is twisted around the core.

9. A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of untwisted or twisted multifilaments and the synthetic fibers are in the form of a monofilament or untwisted or twisted multifilaments, and at least one of the synthetic fiber monofilament or multifilaments is used as a core and at least one of the carbon multifilaments are twisted around the core.

10. A gut for a racket as claimed in claim 6 wherein the carbon fibers comprise a multifilament of string or tape form.

11. A gut for a racket as claimed in claim 6 comprising the combination of said carbon fibers, said synthetic fibers and inorganic fibers, at least one of the three kinds of fibers being twisted so that a combined fiber gut has a nearly linear relation between tensile modulus and elongation and has a modulus value ranging from about 260 Kg./gut to about 290 Kg./gut.

12. A gut for a racket as claimed in claim 7 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.

13. A gut for a racket as claimed in claim 8 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.

14. A gut for a racket as claimed in claim 9 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.

15. A gut for a racket as claimed in claim 10 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.

16. A gut for a racket as claimed in claim 7 wherein the combined and twisted fibers also comprises a metal as a coating.

17. A gut for a racket as claimed in claim 8 wherein the combined and twisted fibers also comprises a metal as a coating.

18. A gut for a racket as claimed in claim 9 wherein the combined and twisted fibers also comprises a metal as a coating.

19. A gut for a racket as claimed in claim 10 wherein the combined and twisted fibers also comprises a metal as a coating.

20. A gut for a racket as claimed in claim 6, wherein said synthetic fibers are made of nylon.