# US 5,700,210 A · Racket frame and process for producing the same

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- Number: US 5,700,210 A
- Document ID: US5700210A
- Status: Granted
- Kind: A
- Application number: 08/629,498
- Filed: 1996-04-10
- Granted: 1997-12-23
- Earliest claimed: 1995-04-20
- Assignees: Yamaha Corporation
- Inventors: Kenjiro Takechi; Yasuhiro Ishigaki; Hitomi Kojo
- Web page: https://patentgrep.com/patent/US5700210A

## CPC

- A63B 49/10: made of non-metallic materials, other than wood
- B29C 70/086: {and with one or more layers of pure plastics material, e.g. foam layers (applying a non-preformed coating, e.g. a gel-coat, B29C37/0025; with foam blocks B29C70/86)}
- A63B 49/11: with inflatable tubes, e.g. inflatable during fabrication
- A63B 2209/023: Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
- B29L 2031/5245: {Rackets}
- Y10S 273/22: Ionomer
- Y10S 273/23: High modulus filaments
- Y10T 428/2933: Coated or with bond, impregnation or core
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A racket frame, which has a frame main body 12 made of a fiber reinforced plastic, an ionomer film 13 covering the frame main body 12, and a coating film 15 formed over the ionomer film 13, is provided with a gas permeable porous material film 14 interposed between the ionomer film 13 and the coating film 15 so as to reduce voids inside the frame main body 12 and between the frame main body 12 and the ionomer film 13. Since voids are reduced inside the frame main body 12 and between the frame main body 12 and the ionomer film 13, and since the ionomer film 13 is reinforced with the gas permeable porous material film 14, the racket frame has an excellent mechanical strength. Adhesion between the frame main body 12 and the ionomer film 13 is excellent. Adhesion between the gas permeable porous material film 14 and the coating film 15 is good.

## Claims

### Claim 1

A racket frame having a frame main body, an ionomer film covering the frame main body, and a coating film formed over the ionomer film; the frame main body containing a fiber reinforced plastic; the racket frame comprising a gas permeable porous material film interposed between the ionomer film and the coating film.