发明名称 |
Device for increasing striking force of tennis rackets |
摘要 |
<p>The device consists of at least one moving weight (1) inside the body of a racket. Each weight is made from a solid material, and has a rigid connection to a spring (2).The return motion of the weight may be controlled by a compression spring (3). When in its rest state, the weight may lie within the handgrip section of the shaft (4) of the racket.</p> |
申请公布号 |
DE4440329(A1) |
申请公布日期 |
1996.05.15 |
申请号 |
DE19944440329 |
申请日期 |
1994.11.11 |
申请人 |
ROGGENKAMP, KARL-HEINZ, 53881 EUSKIRCHEN, DE;TRIMBORN, LUDWIG, 53881 EUSKIRCHEN, DE |
发明人 |
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分类号 |
A63B49/00;(IPC1-7):A63B49/02 |
主分类号 |
A63B49/00 |
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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