| 摘要 |
A retractable caster assembly for permanent attachment to a framework. The caster assembly, when retracted, allows the framework to rest on a surface in a first stable position and when extended, the assembly raises the framework above the surface in a second stable position. The caster assembly comprises a caster, a caster carrying structure, a structure for pivotably mounting the caster carrying structure to the framework and a lever pivotably mounted to the framework for engagement with the caster carrying structure to lower the caster into engagement with the surface in one stable position and raise the center so the lower periphery of the caster is above the lower surface of the framework in another stable position of the assembly.
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