Ratchet irreversible lock04:33

Input: glass handle to which two pink pins are fixed.
Output: blue shaft.
Violet and orange tooth rings are stationary.
Green and brown pawls slide in radial guide ways of the blue shaft. Red spring forces the pawls toward the tooth rings.
The green pawl is in mesh with the orange tooth ring.
The brown pawl is in mesh with the violet tooth ring.
One pink pin moves in the green pawl groove.
The other pin moves in the brown pawl groove.
When the handle turns counterclockwise, one orange pin pulls the green pawl out of the mesh with orange tooth ring and makes the blue shaft turn counterclockwise by contact with the guide way wall. At that time the brown pawl slides on teeth of the violet tooth ring.
When the handle turns clockwise, the other orange pin pulls the brown pawl out of the mesh with violet tooth ring and makes the blue shaft turn counterclockwise by contact with the guide way wall. At that time the green pawl slides on teeth of the orange tooth ring.
When an unintended torque of any direction (counterclockwise or clockwise) is applied to the blue shaft, the shaft can not rotate because the pawls are in mesh with the tooth rings.
In brief, the rotation can be transmitted from the handle to the blue shaft.
The transmission in reverse direction (from the blue shaft to the handle) is impossible.
In other words, it is possible to adjust angular position of the blue shaft by turning the handle. The adjusted position is kept unchanged regardless of any torque applied to the blue shaft.
A worm drive has the similar function but its transmission ratio is very large, not 1 like in this lock.