Bat with groove

Abstract

A bat extending along an imaginary axis includes a top end, a front segment configured to hit a ball, an intermediate segment, and a rear segment configured to be hold. An annular groove that encircles the axis is disposed between the top end and the front segment or between the front segment and the intermediate segment on a surface of the bat. The groove has an empty space communicating with an exterior.

What is claimed is: 
     
         1 . A bat extending along an imaginary axis comprising a top end, the top end integrally connected with a front segment configured to hit a ball, the front segment integrally connected with an intermediate segment, the intermediate segment integrally connected with a rear segment configured to be held, wherein an annular groove that encircles the axis is disposed between the top end and the front segment or between the front segment and the intermediate segment on a surface of the bat, and an empty space communicating with an exterior is provided in the groove. 
     
     
         2 . The bat of  claim 1 , wherein an imaginary plane defined to be parallel to the groove is orthogonal to the axis. 
     
     
         3 . The bat of  claim 1 , wherein the groove is provided with two side walls connected with the surface of the bat, at least one side wall being connected with the surface at an angle less than 90 degrees. 
     
     
         4 . The bat of  claim 3 , wherein a bottom wall formed a concave tapered surface, a concave arc surface or a flat surface is connected with the two side walls. 
     
     
         5 . The bat of  claim 1 , wherein the groove is provided with two side walls connected with the surface of the bat, at least one side wall being connected with the surface at an angle equal to 90 degrees. 
     
     
         6 . The bat of  claim 5 , wherein a bottom wall formed a concave tapered surface, a concave arc surface or a flat surface is connected with the two side walls. 
     
     
         7 . The bat of  claim 1 , wherein the groove is provided with two side walls connected with the surface of the bat, at least one side wall being connected with the surface at an angle greater than 90 degrees. 
     
     
         8 . The bat of  claim 7 , wherein a bottom wall formed a concave tapered surface, a concave arc surface or a flat surface is connected with the two side walls. 
     
     
         9 . The bat of  claim 1 , wherein the surface of the bat is provided with one said groove between the top end and the front segment, and is provided with another one said groove between the front segment and the intermediate segment. 
     
     
         10 . The bat of  claim 1 , wherein the surface of the bat is covered with a protective layer that also enters the space of the groove instead of filling the groove up.