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Casters) Jump to: navigation, search For other uses, see Caster
(disambiguation). Two wheeled Casters on a desk chair (no fork)
Rigid casters[edit]   Swivel casters[edit]  A swivel caster.
Additionally, a swivel caster typically must include a small
amount of offset distance between the center axis of the
vertical shaft and the center axis of the caster wheel. When the
caster is moved and the wheel is not facing the correct
direction, the offset will cause the wheel assembly to rotate
around the axis of the vertical shaft to follow behind the
direction of movement. If there is no offset, the wheel will not
rotate if not facing the correct direction, either preventing
motion or dragging across the ground.  When in motion along a
straight line, a swivel caster will tend to automatically align
to, and rotate parallel to the direction of travel. This can be
seen on a shopping cart when the front casters align parallel to
the rear casters when traveli