| 摘要 |
A caster of a collapsible crib includes a wheel and an outer cover fixed to the bottom of the crib. The wheel is rotatably housed within the outer cover. The outer cover has a supporting block, which is arranged such that the wheel is a distance from the ground when the crib is held upright on the ground, i.e. the supporting block touches the ground instead of the wheel. The crib is provided with two above described casters and two supporting base members so that it can be normally supported upright with four points; while the crib, when collapsed, can be leant on a user hand so that it is supported with only wheels of the casters to be capable of moving erasily.
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