Rack and Pinion : A rack is a straight bar with gear teeth cut into it. A pinion is a small gear wheel. When meshed together, rotary movement of the pinion causes a linear movement of the rack or vice-versa
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}