Baseball bat structure and method for making the same

Abstract

A baseball bat structure includes a center portion in the form of a round bar, and at least one sheet-shaped wind wooden unit wound around the center portion. A direction of the grain of the grain portions of one layer of wind wood unit is different from that of the grain portions of a neighboring layer of wind wood unit, so that the grain portions of one layer of wind wood unit are arranged in a staggered manner with respect to the grain portions of the neighboring layer of wind wood unit, and therefore, the staggered grain portions can enhance the structure strength. Being laminated structures, the wind wood units can offer a better structure elasticity to the baseball bat structure, making the baseball bat structure less likely to crack while extending the service life.

What is claimed is: 
     
         1 . A baseball bat structure comprising:
 a center portion in the form of a round bar; and   at least one sheet-shaped wind wooden unit including plural spaced grain portions, the at least one sheet-shaped wind wooden unit being wound around the center portion to form plural layers of wind wooden unit in such a manner that a direction of the grain of the grain portions of one layer of wind wood unit is different from that of the grain portions of a neighboring layer of wind wood unit, after being wound around the center portion, the at least one wind wooden unit will be processed into a baseball bat shape.   
     
     
         2 . The baseball bat structure as claimed in  claim 1 , wherein the baseball bat structure is provided with plural wind wooden units, and the plural wind wooden units are wound around the center portion one upon another. 
     
     
         3 . The baseball bat structure as claimed in  claim 1 , wherein the center portion includes plural center portion forming units that are thin wood sheets laminated one upon another and then pressed and rolled into the round bar, the plural center portion forming units each include plural spaced grain portions, a direction of the grain of the grain portions of one center portion forming unit is different from that of the grain portions of a neighboring center portion forming units. 
     
     
         4 . A method for making a baseball bat structure as claimed in  claim 1 , comprising the steps of:
 winding wind wooden unit: at least one wind wooden unit is applied with adhesive thereon and then wound around a center portion;   pressing: after being wound around the center portion, the at least one wind wooden unit will be pressed to be more closely connected to the center portion; and   processing: after being pressed, the at least one wind wooden unit will be processed into a baseball bat shape.   
     
     
         5 . The method for making a baseball bat structure as claimed in  claim 4  further comprising the step of forming a center portion by pressing: the center portion includes plural center portion forming units that are thin wood sheets, the plural center portion forming units are laminated one upon another and then pressed and rolled to form the baseball bat structure in the form of a round bar, each of the center portion forming units includes plural spaced grain portions, a direction of the grain of the grain portions of one center portion forming unit is different from that of the grain portions of a neighboring center portion forming units.