Blue and green shafts rotate around a fixed axis.
Yellow nut of male cone has a helical joint (right hand thread) with the blue shaft.
Red torsion spring tends to turn the yellow nut clockwise thus
maintains contact for cone surfaces of the yellow nut and the green shaft.
The arrows show which link is the driving at different times.
When the blue shaft is driving and rotates anticlockwise, the green shaft tends to keep the nut immobile. The latter tends to move towards the green shaft, contact force at cone surfaces increases, the green shaft rotates together with the blue shaft.
When the blue shaft is driving and rotates clockwise, the green shaft tends to keep the nut immobile. The latter tends to move apart from the green shaft, contact force at cone surface decreases, the green shaft stays immobile.
In brief:
- When the blue shaft is driving, its two way rotation can be transmitted to the green shaft only in anticlockwise direction.
- When the green shaft is driving, its two way rotation can be transmitted to the blue shaft only in clockwise direction.
- If the green shaft is kept immobile, the blue shaft can rotate only anticlockwise. It is braked automatically when rotating clockwise(mechanism for preventing reverse rotation).
This mechanism is created purely on computer and needs to be verified in practice.