| 摘要 |
A ball bat comprises an impact portion 12, a grip portion 14, and a flexible bending portion 16 between the impact portion and the grip portion. The bat has a fibre-reinforced plastic casing 20 of a predetermined thickness. Slits 32 of a predetermined number are provided in the casing located at the junction area of flexible bending portion and grip portion. The number of fibers incised to form the slits is in a predetermined proportion to the total number of fibers contained in the casing located at the junction area, with the ratio being in the range of 5%-95%. The slits serve to obstruct the transmission of shock from the impact portion to the grip portion of the bat. Rigidity and elasticity of the impact portion are different from those of grip and flexible bending portions by virtue of an existence of slits disposed in the latter. Rigidity and elasticity of the junction area of flexible bending portion and grip portion can be adjusted by means of slits to an extent that the optimum effect of swinging is attained. A covering layer 34 of a polymeric material can be used to encase the area, where the slits are provided, for the dual purposes of protecting the area and of absorbing the residue of shock. <IMAGE> |
