Patent ID: 6402646
Filing Date: 2002-06-11
Classification: A63B

Abstract:
A stand alone pre-woven string surface unit intended for a sports racket, under tension, and held firm by a metal or synthetic composite ring structure,said stand alone string surface unit consists of pre-woven strings, under preselected tension, between two annular sheets of metal or composite (anticipating the size and shape of a conventional tennis or sports racket frame), forming a layered, and optionally a crimped or corrugated structure around the perimeter and in the plane of the string surface, said pre-woven string surface, with a string spacing of at least twice the thickness of the strings, selected from the group consisting of gut, synthetic plastic yarn, metal or a suitable combination of them, said layered structure with a spiral cross section, perpendicular to the plane of the string surface, and concentric with the string surface, running continuously along its perimeter, alternatively, said layered structure with a zig-zag (â€œZâ€ -fold) cross section, perpendicular to the plane of the string surface, and concentric with the string surface, running continuously along its perimeter, alternatively, said stand-alone string surface unit consists of the woven strings, under preselected tension, between two or more concentric rings, such that in a plane perpendicular to the string surface, the strings are in an â€œSâ€ -like configuration between the concentric rings, said rings selected from the group consisting of metal, plastic, synthetic carbon fibre or a suitable combination of them.