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A '''caster''' (or '''castor''') is an undriven [[wheel]] that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved.
Casters are used in numerous applications, including [[shopping cart]]s, [[office chair]]s, [[toy wagon]]s, hospital beds, and [[material handling]] equipment. High capacity, heavy duty casters are used in many industrial applications, such as platform trucks, carts, assemblies, and tow lines in plants
==Types==
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===Rigid casters===
A basic, rigid caster consists of a wheel mounted to a stationary fork. The orientation of the fork, which is fixed relative to the vehicle, is determined when the caster is mounted to the vehicle.<ref>{{Cite book |last=Wagner |first=Markus |url=https://books.google.com/books?id=HkoRC4_vR1IC&pg=PA557 |title=VERZEICHNIS MECHATRONIK: Grundlagen-BEGRIFFE werden erklaert - in German language: alphabetical index of technical terms mechatronics |date=2015-05-19 |publisher=LEHRMITTEL WAGNER / Autor |isbn=978-3-86479-138-3 |language=de}}</ref> An example of this is the wheels found at the rear of a shopping cart in North America. Rigid casters tend to restrict vehicle motion so that the vehicle travels along a straight line.
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