| 摘要 |
A tube-shaped element that can be inserted within the hollow barrel portion of an aluminum softball bat will provide damping and spring characteristics to the softball bat with improved life. This tube-shaped element is made from heat-treated metals and formed with a top and bottom diameter substantially equivalent to the internal diameter of the softball bat and with a central portion somewhat larger in diameter. A series of holes is drilled along the periphery of the top and bottom ends and then a series of slits is cut longitudinally along the length of the middle portion, each slit travelling from a hole in the top end to a similar hole in the bottom end. These slits permit the element to be compressed so as to fit within the hollow-hitting portion of the softball bat. A plastic coating may be placed on the tube-shaped element or a foam may be foamed within the hollow portion in order to deaden the sounds.
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