| 摘要 |
A support frame assembly including at least one pair of generally vertical spaced uprights joined together by transversely extending structural members and having caster wheel support members for supporting a rotatably mounted caster wheel mounted axle and a pedal actuatable lever engaging the axle to allow selective movement of the caster wheel mounted axle between "mobile" and "use" mode conditions-the invention further including a joined second pair of generally vertical spaced uprights each having a caster wheel support member for yieldably supporting a caster wheel arrangement for selective movement between "mobile" and "use" modes.
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