Patent ID: 8231484

Claim:
A variable inertia bat training aid for a bat having a barrel of substantially uniform diameter, a narrower handle portion and a tapered transition from the handle portion to the barrel, said training aid comprising: a double layered sleeve having a diameter sufficient to receive said bat barrel and having a length to extend along at least a portion of said bat barrel, said sleeve having closed ends with a proximal end having a diameter less than said barrel diameter; a plurality of partitioning elements running lengthwise of said sleeve to establish a plurality of closed, elongate radial pockets substantially the length of said sleeve; a plurality of weights corresponding in number to the number of radial pockets with one said weight being captured within each said radial pocket and each said weight being substantially shorter in length than the length of said radial pocket in order to be selectively moveable along the length thereof; and a plurality of restraining members adapted to encircle said sleeve to restrict movement of said weights captured within said radial pockets along the length of said sleeve; whereby said sleeve may be inserted over said bat handle and slid along said bat until limited in further travel by said proximal end of said sleeve and then said weights may be individually positioned along the length of said sleeve and held in place by said restraining members to achieve a preselected moment of inertia for bat training exercises.