Claims
- 1. A tennis racket comprising a circular frame member constituting a ball hitting area and a shaft member connecting with said circular frame member, said frame and shaft members having a plurality of layers structured such that at least one layer is formed from a composite prepreg, said composite prepreg comprising a thermosetting resin and reinforcing fibers embedded therein, wherein said reinforcing fibers are a combination of (a) aromatic polyamide fibers, polyester fibers, or a mixture of aromatic polyamide fibers and polyester fibers and (b) carbon fibers, said fibers (a) are formed into a plurality of first yarn strands and said fibers (b) are formed into a plurality of second yarn strands, a ratio between a diameter of said second yarn strands and a diameter of said first yarn strand is in the range of 2 to 2/3, and said first yarn strands and said second yarn strands are arranged substantially in a plurality of sequential units of said first and second yarn strands therein.
- 2. The tennis racket according to claim 1 wherein said frame and shaft includes a core and five prepregs wound on said core.
- 3. The tennis racket according to claim 2 being prepared by winding said five prepregs around said core and then heating in a mold.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-308231 |
Nov 1989 |
JPX |
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Parent Case Info
This application is a divisional of copending application Ser. No. 08/338,216, filed on Nov. 4, 1994, now pending, of which is a File Wrapper Continuation of Ser. No. 07/618,607, filed Nov. 27, 1990, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4429873 |
Van Raemdonck |
Feb 1984 |
|
4532275 |
Aito et al. |
Jul 1995 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
58-205755 |
Jan 1983 |
JPX |
62-059030 |
Jan 1987 |
JPX |
1174413 |
Jan 1989 |
JPX |
2217641 |
Jan 1989 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
338216 |
Nov 1994 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
618607 |
Nov 1990 |
|