Patent ID: 6146291
Filing Date: 2000-11-14
Classification: A63B

Abstract:
A baseball bat, comprising:a barrel portion adapted for hitting a baseball;a handle portion adapted for holding the baseball bat; andan elongate, tunable shaft comprising a plurality of tunable sub-portions, said shaft connecting between said barrel portion and said handle portion, said tunable sub-portions having associated diameters that vary from the diameters of adjacent of said tunable sub-portions by discrete amounts, wherein said diameters generally increase with increasing proximity to said barrel portion, wherein said tunable sub portions are disposed in a series, the baseball bat further comprising one or more hollow, frustoconical transition portions connected between adjacent of said tunable sub-portions, a major diameter of said transition portions substantially equaling the diameter of said respective cylinder of one of said adjacent tunable sub-portions and a minor diameter of said transition portions substantially equaling the diameter of said respective cylinder of said other adjacent tunable sub-portion, wherein said transition portions have substantially continuously varying diameters between said major diameter and said minor diameter and associated wall thickness that vary in substantially linear, inverse relation to said associated diameters.