| 摘要 |
A circular wooden platform (3) is mounted on a steel frame (5) with spokes (4) and struts (19). The steel frame is supported on a number of springs (8) which rest on a lower circular frame (11) with spokes (14) and a central boss (16). The boss has a socket for the ball end (15) of a central upright (1). The latter passes through the centre of the wooden platform and its upper end is fitted with a circular handgrip (2).
|
