| 摘要 |
<p>The expander consists of a compact frame (1) with a load rod (3) interlocked with a swing arm (2). The free end of the swing arm (2) is equipped with an action backrest (6) being actuated upon by a trainee. The expander is equipped with a seat place (43) on a sliding seat (4) that is transferable in either direction and imbedded on a pilot (42). The swing arm (2) is, between the action backrest (6) and the axis of rotation, equipped with a reaction backrest (7).</p> |
