| 发明名称 |
RACKET FOR PLAYING A GAME WITH A BALL |
| 摘要 |
<p>The stiffness of a tennis racket is adjusted so that the first mode of bending of the racket under free-free constraint conditions is between 170 Hz and 250 Hz preferably between 200 Hz and 210 Hz. The second mode of bending under clamped-free constraint conditions is between 215 Hz and 315 Hz and preferably between 230 Hz and 265 Hz.</p> |
| 申请公布号 |
EP0317711(B1) |
申请公布日期 |
1992.12.09 |
| 申请号 |
EP19880112740 |
申请日期 |
1988.08.04 |
| 申请人 |
WILSON SPORTING GOODS COMPANY |
发明人 |
KARASEK, MARK L |
| 分类号 |
A63B49/02;A63B49/10;A63B59/00 |
主分类号 |
A63B49/02 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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