| 摘要 |
A composite racket frame includes a shaft constituted by a shell and a foamed core and having a portion of smallest cross-section substantially at an intermediate portion thereof relative to any other portion, the dimension of the cross-section of the portion being restricted only in a direction substantially perpendicular to the plane of the string web. The shaft further having two stepped width-increasing portions respectively extending from the smallest portion toward the throat section and the end of the shaft. The grip member of the shaft extends at least partly over the smallest cross-section portion, and the stepped width-increasing portions are stepped both on the outside and on the inside of the shell of the shaft.
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