String for a racket

• US 6,450,904 B1
• Filed: 09/29/2000
• Issued: 09/17/2002
• Est. Priority Date: 09/29/2000
• Status: Expired due to Fees

• Current Assignee: Peter Yeh
• Original Assignee: Peter Yeh
• Inventors: Yeh, Peter
• Primary Examiner(s): Chiu, Raleigh W.
• Application Number:
  US09/676,404
• Time in Patent Office: 718 Days
• Field of Search: 473/543, 473/537, 473/524, 428/373, 428/374
• US Class Current: 473/543
• CPC Class Codes: A63B 2209/023 Long, oriented fibres, e.g. wound filaments, woven fabrics, mats
• CPC Class Codes: A63B 51/02 Strings; String substitutes; Products applied on strings, e.g. for protection against humidity or wear

Abstract

A string for a sports racket includes a toothed core made of a first plastic material and having a toothed outer surface, and a sheath layer made of a second plastic material and molded over the core so as to be bonded to the toothed outer surface. The first plastic material has a hardness and a wear-resistance less than those of the second plastic material.

Claims

1. A racket, comprising:

a racket frame; and

a cord netting stretched in said frame;

said cord netting comprising a string that is composed of a core made of a first plastic material and having a toothed outer surface formed by adjoining teeth on a periphery of the core, each tooth having a base width which is greater than a height of the tooth, and a sheath layer made of a second plastic material and molded over said core so as to be bonded to said teeth, said first plastic material having a hardness and a wear-resistance less than a hardness and wear-resistance of said second plastic material.

2. The racket of claim 1, wherein said first and second plastic materials are co-extruded via an extruder to form said core and said sheath layer.

3. The racket of claim 1, wherein said first plastic material is polyurethane.

4. The racket of claim 1, wherein said first plastic material is nylon.

5. The racket of claim 3,wherein said second plastic material is polyester.

6. The racket of claim 3, wherein said second plastic material is polyester.

7. The racket of claim 1, wherein said teeth have a rounded teeth outer surface.

8. The racket of claim 1, wherein said teeth have a sharp teeth outer surface.