| 摘要 |
A bumper for the racket frame consists of two identical half members, in which each half member comprises a flat strip having inner and outer surfaces in parallel, with one lateral side in substantial straight-cross-section while another lateral side in corrugated cross-section having alternative peak and valley portions, and a plurality of tubes integrally formed an distributed on the inner surface of the flat strip at respective peak portion and extended at an angle with respect to the inner surface of the flat strip along a direction either toward or opposite to the rising of the peak portion to a certain extent. When two half members are respectively installed onto the racket frame to complete an unitary bumper structure, the tubes are so arranged that obliquely extended in opposite directions alterately.
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