| 摘要 |
<p>An article of manufacture comprising a shaft having a handle end (41) and a head end (42), the shaft including a first tubular element (75) which is torsionally rigid, rotationally anisotropic along at least a portion of its length and is maintained in a twisted condition in the direction of greater torsional rigidity, thereby defining a first twisted segment, and the shaft further including a second tubular element (76), adjacent and generally coaxial to said first tubular element, which is torsionally rigid, rotationally anisotropic along at least a portion of its length and is maintained in a twisted condition, thereby defining a second twisted segment, wherein the twist of the second twisted segment is along its direction of greater torsional rigidity which is the direction opposite to the twist of said first twisted segment. <IMAGE></p> |
