CLICK
The click is a lever ending in a beak or a finger, held in contact against the teeth of a wheel by the action of a spring. Its function is to allow the wheel to rotate in only one direction and prevent it from turning back: when the wheel rotates in the permitted direction, the click slides and jumps from tooth to tooth; as soon as a reverse force is applied, it locks into the notch of a tooth and immobilizes the wheel. In watchmaking, the click is mainly found at the level of the Barrel, associated with the Ratchet wheel, where it retains the energy stored in the spring as winding progresses and prevents its Letting down from occurring abruptly. It is also found in certain Automatic winding and striking mechanisms. The design of the click, the shape of its beak and thestiffness (spring rate) of its spring must ensure reliable retention while limiting wear on the teeth.
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