A ball (1) for practicing a sport or game comprises a shell (3) containing inertia means, for example a fluid (9) and a core (7) freely rotatable within the shell. The inertia means exagerates or amplifies the effect of an impact or stroke. Preferably, the core is in the form of an inner ball with a central spindle (11) with a weighted portion (15) at one end. One or more smaller solids loose within the shell can also be used instead of the core.
申请公布号
WO9409863(A1)
申请公布日期
1994.05.11
申请号
WO1993GB02228
申请日期
1993.10.29
申请人
WALDREN, ROBIN, MICHAEL;NUTEK PTE. LTD.;YONG, CHOON;CHAN, VEN, LIN