ratchet wheel

English Thesaurus

1. toothed wheel held in place by a pawl or detent and turned by a lever (noun.artifact)

hypernym	:	wheel,
definition	:	a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines) (noun.artifact)

part meronym	:	rachet, ratch, ratchet,
definition	:	mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction (noun.artifact)