| 摘要 |
<p>An inflatable generally toroidal suspension tube (36) for resiliently suspending and retaining a stringed inner frame insert (26) within an outer frame (14) of a racket head (12). Different parts of the suspension tube (36) are able to expand at different rates in response to increased inflation pressure, so as to control distortion of the outer frame (14) of the racket head (12). The suspension tube (36) may be of a thermoplastic material and tubular restrictors (48, 50) surround the portions of the suspension tube (36) which are intended in use to be located where the radius of curvature of the frame (14) is greatest, in order to prevent distortion of those parts of the racket head frame (14).</p> |
