| 主权项 |
1. A foldable structure comprising:
an upper assembly forming an upper portion of the structure, the upper assembly comprising a plurality of arm assemblies; a base assembly forming a lower portion of the structure; a centrally-located hub assembly operatively connected to the base assembly; a post extending from each corner of the upper assembly to a corner of the base assembly, thereby forming the structure; an operating structure operatively connected to at least the base assembly; and a wheel assembly provided at each corner of the base assembly extending from the base assembly to engage a surface, each wheel assembly comprising:
a wheel body having a central axis about which the wheel assembly rotates;at least one support surface adapted for supporting and guiding the wheel body on a surface; andat least one groove provided on opposing sides of the support surface, the at least one groove engages the operating structure, wherein movement of the hub assembly towards a surface upon which the foldable structure is positioned causes the foldable enclosure to move from a folded position to an opened position, and movement of the hub assembly away from the surface causes the foldable structure to move from the open position to the folded position. |
