| 摘要 |
<p>Swap assembly, i.e. mechanism adaptable to any bicycle frame. Consists of rear wheel mounted on special hub fitted axially with two levers 14, 15 that move alternately on two free wheels 20, 21, a special transmission carrying the drive to the same wheel. The levers can oscillate, being suspended by a steel cable 32 over a suitably positioned idle pulley 31. <IMAGE></p> |
