| 摘要 |
A multi-wall bat of the type used for playing baseball or softball. The bat includes a hollow metallic inner wall having a spiral textured surface and a hollow metallic outer wall surrounding the inner wall. The outer wall lies against the spiral textured surface of the inner wall, whereby the area of contact between the inner and outer walls of the bat is minimized. By virtue of the precise and constant contact between the outer wall and the raised peaks of the textured surface of the inner wall, the inner and outer walls are adapted to flex both independently of and simultaneously with each other in response to a ball striking the bat. One of the inner or outer walls is capable of being slidably displaced relative to the other wall in response to a ball striking the bat.
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