非驱动旋转轮单元。它由轮架，轮，安装和旋转元件组成。车轮安装座和车轮的结构与脚架或脚轮辊相同。
Non-driven, revolving wheel unit. It consists of wheel mount, wheel, mounting and revolving elements. Wheel mount and wheel have the identical construction as the trestle or castor roller.
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