| 摘要 |
<p>A repetitive jumping device for sport and recreation is basically composed of two plates (1, 2) with springs (3) arranged between them and of two ropes (4) arranged on or at the opposite edges (5) of the plate (2) and having optionally shaped handles (6) at their free ends. Both plates (1, 2) are shaped approximately as a rectangle or an oval while an abutting surface (7) of the plate (1) is provided with an elastic marginal section (8) having discontinuities (9) in several places and with a central elastic element (10), whose height is preferably greater than the height of the section (8). The plate (2) is bent along the edges (5) in a direction opposite to the one of the spring (3).</p> |
