| 摘要 |
<p>A spherical ball, for projection through the air to deviate from an expected trajectory, has a first hemisphere (12) and a second hemisphere (14). The surfaces (52, 54) of the first hemisphere (12) and the second hemisphere (14 ) are generally smooth, except for the provision of a simulated seam (53) whic h gives the ball the appearance of a baseball. An insert (40) of felt-like material is provided in the second hemisphere (14), with the surface of the insert (40) flush with the surface (54) of the hemisphere (14). When the bal l is projected along the plane of the line (16) between the hemispheres (12, 14), it will deviate from that plane in the direction of the first hemispher e (12). The ball is manufactured by locating the insert (40) in a mould (60) a nd injecting polyurethane foam (64) into the mould (60) with the insert (40) bonding with the foam (64).</p> |
