Tennis racket and method of making same
OwnerWerner Fischerinventor
Life of this patent
Estimating the term…
Abstract
Tennis rackets and the like which are particularly adapted for transferring angular momentum to a ball, and methods for making such rackets. The rackets have a central strata of cross strings of particular arrangement and two outer strata of main strings which are laterally independent of the cross strings. The strings of the main string strata are provided with sheaths for engagement with the cross strings. The main string strata are further provided with position stabilized holding strings.
Claims17
A tennis racket or the like which is particularly adapted for angular momentum transfer comprising,
- a racket body comprising a racket handle and a racket head frame,
- a central stratum in said frame of paired, tensioned cross strings,
- a first stratum of regularly spaced main strings in said frame adjacent one side of said cross string stratum, and a second stratum of regularly spaced main strings in said frame adjacent the other side of said cross string stratum, the spacing of said main strings being not more than about half of the spacing of said cross strings,
- a plurality of sheaths positioned on strings of said main string strata at points of contact between said main strata strings and said cross stratum strings in at least the central zone of said racket head frame, said sheaths having a diameter of at least about one and one half times the diameter of the cross strings and a length at least about three fourths of the center-to-center spacing of the main strings, and
- a set of holding strings for each of said main string strata for unifying the respective lateral movement of said main string strata, and means positioned on said main strings for preventing the displacement of said holding strings on said main strings.
A method for manufacturing a tennis racket which is particularly adapted for angular momentum transfer, comprising the steps of
- providing a tennis racket frame, stringing a strata of paired cross strings having a predetermined pair-wise separation, stringing a stratum of main strings at each side of said central cross stratum to provide two independent main string strata having main strings which are regularly spaced apart with a separation distance not more than half the pair-wise separation of said cross string pairs while concommitantly applying cylindrical sheaths having a diameter of at least one and one half times the cross string diameter and a length at least three fourths of the main string separation distance for intended points of contact between said main and cross strings, applying holding strings to each of said main string strata for connecting strings of said respective strata together for lateral movement as a unit, such that displacement of said holding strings along said main strings is restrained.
A tennis racket or the like comprising,
- a racket body comprising a racket handle and a racket head frame,
- a central stratum of cross strings in said frame,
- a first stratum of main strings in said frame adjacent one side of said cross string stratum, and a second stratum of main strings in said frame adjacent the other side of said cross string stratum, and
- a first set of holding strings independent of tensile connection with said frame, and positioned on and connecting main strings of said first main string stratum for unifying lateral movement of said first main string stratum, a second set of holding strings independent of tensile connection with said frame and positioned on and connecting main strings of said second main string stratum for unifying lateral movement of said second main string stratum, means comprising a plurality of sheaths positioned on and fastened to main strings of said first main string stratum for preventing displacement of said first set of holding strings on said first main string stratum and means comprising a plurality of sheaths positioned on and fastened to main strings of said second main string stratum for preventing displacement of said second set of holding strings on said second main string stratum.
Dependencies are inferred from the claim text.