ratchet; toothed wheel
A mechanical wheel with teeth that allows motion in one direction only, often used with a pawl. Technical term.
See also: ラチェット
This tool uses a ratchet.
If the ratchet fails, it will rotate backwards.
Standard kanji spelling for this mechanical term.
Mixed kanji-kana spelling, also common in technical contexts.
Compound of 爪 (つめ, 'claw, pawl') and 車 (くるま, 'wheel'), describing a wheel with claw-like teeth.