A rod has a spherical head and a joined rod has a hollow spherical receptor {ball and socket joint}|.
Two rods can hinge at obtuse angle {toggle joint}|, and rods have hinges at other end. Force at central hinge pushes far ends outward.
Two shafts can link at two axes {universal joint}|, perpendicular to each other and to shafts. Universal joint allows free movement in all directions.
Mechanical joints {caster, furniture}| {furniture caster} can allow swivel and roll.
structure
A shaft rotates around vertical axis. Shaft holds an axle around which wheel or sphere rotates. Wheel can swivel and roll freely, so furniture can move easily.
types
Bent tubes can hold both vertical shaft and wheel shaft {skew caster}. Balls can be set in vertical holders {ball caster}.
speed
Casters typically wobble at higher speeds.
brakes
Casters can have brakes. Pedals prevent roll but not swivel.
Objects {swivel}| can have a central sheath holding a post attached to a base, allowing horizontal object rotation.
7-Machine-Kinds-Mechanical-Rotation
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Date Modified: 2022.0225