Composite synthetic string for tennis racket

• US 20030145574A1
• Filed: 04/02/2003
• Published: 08/07/2003
• Est. Priority Date: 05/09/2000
• Status: Active Grant

• Current Assignee: Cousin Biotech
• Original Assignee: Cousin Biotech
• Inventors: Delvael, Yves
• Granted Patent: US 6,978,593 B2
• Time in Patent Office: Days
• 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: D07B 1/02 Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics

Abstract

The invention concerns a composite synthetic string in particular for a tennis racket. The invention is characterised in that the string consists of central monofilaments (3) surrounded by multifilament yarns (2), the assembly being impregnated and coated with polyurethane (1) and is subjected to tractive bending after it has been formed. The invention is useful for tennis strings with novel appearance, with long life span and quick reaction when hitting a ball.

Claims

1. A synthetic composite string, particularly for a tennis racket, having threads (2) of a first synthetic material and binder (1) made of a second synthetic material impregnating to the core, connecting and covering said threads which are spirally wound, the melting point of the binder being less than that of the threads and its elasticity much higher, said threads being made up of multifilaments, characterized by the fact that at least one monofilament (3) with two flat sides is arranged in the center of the string, this string undergoing a tensile bending which causes delamination.

2. A composite string according to claim 1, characterized by the fact that oblong monofilament (3) appears as a contrasted spiral through the transparent binder and multifilaments (2).

3. A composite string according to either claim 1 or claim 2, characterized by the fact that monofilaments (3) and multifilaments (2) are made of polyamide, the binder consisting of polyurethane.