A pawl is a small mechanical catch that lets a part move in one direction but stops it from moving backward.

Basic meaning

  • A pawl is usually a short, pivoted bar or tongue that drops into the teeth or notches of another part, such as a ratchet wheel or toothed bar.
  • By engaging those teeth, it allows rotation or motion in one direction while blocking motion in the opposite direction.

Where you see pawls

  • Common examples include ratchet wrenches, winches, windlasses, hoists, some clock mechanisms, and bicycle freehubs, where the pawl lets the wheel turn forward but prevents reverse motion when engaged.
  • In many designs the pawl is spring‑loaded so it automatically snaps into place as the ratchet moves, giving the familiar clicking sound.

How it works (simple view)

  • The pawl is mounted on a pivot and shaped so its tip falls into the gaps between teeth at an angle that resists backward force.
  • When the mechanism moves forward, the pawl rides over the teeth; when it tries to move back, the pawl jams against a tooth and holds it.

Word notes

  • As a noun, “pawl” is the mechanical part; as a verb, “to pawl” can mean to stop or lock something using a pawl.
  • Related terms you may see are “ratchet and pawl” (the full one‑way mechanism) and synonyms like “detent,” “click,” or “dog” in some technical contexts.

Information gathered from public forums or data available on the internet and portrayed here.