| 摘要 |
<p>A compound ball (A) simulates the performance of a regulation size baseball, softball, and golf ball. It is formed of spherical outer (10) and inner shells (11) dimensioned to abut one another or to provide a spacing between them. The outer shell (10) is formed of molded polymeric material with circular apertures (13) spaced over its surface. The inner shell (11) is gas filled and resiliently rebounds in response to being compressed by the outer shell (10) upon deformation of the outer shell in response to being hit, as by a bat or club. The apertures (13) in the outer shell (10) permit air to pass through the apertures (13) when the compound ball (A) is in flight. The inner shell (11) provides mass and impact rebound within the outer shell (10) for simulating the action of a regulation ball when thrown, caught, hit or impacts an object. The outer shell (10) may also contain raised dimpling to impart greater aerodynamic drag on the compound ball (A), further limiting its flight and range, or altering its performance.</p> |
