rack and pinion

English Thesaurus

1. a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa) (noun.artifact)

hypernym	:	cogwheel, gear, gear wheel, geared wheel,
definition	:	a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion (noun.artifact)