Pignon cremaillere

A French term!

"Pignon cremaillère" is a French term that refers to a type of toothed wheel or gear that is used in mechanical systems, particularly in clocks, watches, and other precision mechanisms.

In French, "pignon" means "pinion" or "toothed wheel", and "cremaillère" means "ratchet" or "toothed wheel with a ratchet mechanism". So, a pignon cremaillère is essentially a toothed wheel with a ratchet mechanism that allows it to move in one direction only, while preventing it from moving in the opposite direction.

Pignons cremaillères are commonly used in mechanical watches, clocks, and other precision mechanisms to transmit power from one gear to another, while ensuring that the gears move in a specific direction. They are also used in other mechanical systems, such as gearboxes, transmissions, and other machinery.

In summary, a pignon cremaillère is a type of toothed wheel with a ratchet mechanism that is used to transmit power and control the direction of motion in mechanical systems.