ratchet mechanism

A ratchet mechanism is a device that allows rotational movement in one direction while preventing it in the opposite direction. It typically consists of a gear with teeth and a pawl—a lever that engages these teeth. When rotating in the allowed direction, the pawl slides over the teeth smoothly; when trying to turn back, the pawl catches on the teeth, stopping movement. This setup ensures controlled advancement or tightening, commonly used in tools like clocks, socket wrenches, and vehicle jacks to maintain tension or position without slipping backward.