23a.avi Uploaded on 06/03/2014
Blue and green shafts rotate around a fixed axis.
Red spring maintains contact between yellow sprag, pink pin 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.