| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a ball bat capable of improving entire hitting performance while satisfying existing performance regulations. <P>SOLUTION: The bat comprises a substantially tubular frame and a substantially tubular body part. The frame extends along a longitudinal axial line and has a handle part and a main hitting part. The body part coaxially aligns with the hitting part of the frame. The body part comprises a near end and a far end, and a first and a second tubular wall transition regions. The first tubular wall transition region is nearer to the near end than the second tubular wall transition region. In general, wall thickness of the first tubular wall transition region approximately increases from a first position near the near end toward the far end along the longitudinal axial line. In general, wall thickness of the second tubular wall transition region approximately increases from a second position near the far end toward the near end along the longitudinal axial line. The body part moves independently from the hitting part of the frame upon impact with a ball. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
