Blue and green shafts rotate around a fixed axis.
Copper springs maintain contact between yellow sprags, pink pins and the two shafts.
The arrows show which link is the driving at different times.
When the blue shaft is driving, its two way rotation can be transmitted to the green shaft only in clockwise direction.
When the green shaft is driving, its two way rotation can be transmitted to the blue shaft only in anticlockwise direction.
![](https://s2.save4k.ru/pic/6R8t0pnh7sk/mqdefault.jpg)