Baseball or softball bat

Abstract

A sweet spot 3 of an impact portion 2 has a smaller diameter than the other portions of the impact portion 2, whereby the impact portion 2 has an intermediate tapering shape in the longitudinal direction. Thus, even if hit with a portion at some distance from the sweet spot, rebound performance is not significantly reduced. Therefore, a bat having a large sweet area and capable of reducing the occurrence of foul balls is obtained.

What is claimed is:  
     
         1 . A baseball or softball bat, wherein a sweet spot of an impact portion has a smaller diameter than other portions of said impact portion, and said impact portion has a recessed outer shape in a longitudinal direction.  
     
     
         2 . The baseball or softball bat according to  claim 1 , wherein an outline of a recessed part of said impact portion includes a curve.  
     
     
         3 . The baseball or softball bat according to  claim 2 , wherein the outline of the recessed part of said impact portion is part of an arc or ellipse.  
     
     
         4 . The baseball or softball bat according to  claim 3 , wherein the outline of the recessed part has a curvature radius of 200-1000 cm.  
     
     
         5 . The baseball or softball bat according to  claim 1 , wherein the diameter of said impact portion increases from said sweet spot toward a leading edge and grip end of said bat.  
     
     
         6 . The baseball or softball bat according to  claim 1 , wherein the outline of the recessed part of said impact portion includes a straight line.