| 摘要 |
<p>Device comprising, in addition to the roller (3) and the foot support (5), a plate (8) which is substantially longer than the foot support (5) and is capable of forming a rolling track. The plate comprises a longitudinal groove (9) formed in the underside and a pulley (13) at each of its ends. A longitudinally tensile resilient belt (12) fastened to the ends of the foot support (5), and carried and guided by two pulleys (13) travels by sliding through said groove (9). Because of its length, the belt (12) is tensioned when the roller (3) is placed on the baseplate (8) at right angles to the longitdudinal axis of the latter, and the foot support (5) rests on the roller (3). Said belt is capable of resiliently damping the movements of the foot support.</p> |
