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A caster (or castor) is an undriven, single, double, or compound wheel mounted on an object to make movement easier. Found on shopping carts, office chairs and material handling equipment, casters may be fixed to roll in one direction, or mounted on a pivot, such that the wheel will automatically swivel, aligning itself to the direction in which it is moving. Swiveling casters are sometimes themselves attached to handles, so users can turn the caster into the desired direction. Casters are used in many industrial applications. Heavy duty and high capacity casters are used on platform trucks, carts, assemblies, and tow lines in plants. A caster is defined as a wheel mounted to a fork, but has an additional offset steering joint. The steering joint allows the wheel to rotate freely in 360°. This allows for easy turning of objects without changing the direction of the chassis that the casters are mounted to. The angle and distance of the wheel axles and steering joint can be adjusted for different types of caster performance.[1] Casters are typically used on carts and furniture and are mounted underneath these platforms. Casters are advantageous for moving vehicles or platforms in both straight and turning motions. Casters are commonly used on supermarket shopping carts.
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