| 摘要 |
An apparatus comprising a platform and a plurality of trucks coupled to the platform. The trucks are longitudinally opposing each other. The apparatus further comprising a plurality of roller assemblies coupled to the platform. The assemblies are longitudinally opposing each other between the trucks. The assemblies are configured for omnidirectional rotation. The assemblies are elastically biased for longitudinal alignment. At least one of the assemblies comprises a motor. |
