Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 10, 2015
Patent Application Number
13794949
Date Filed
March 12, 2013
Patent Citations Received
Patent Primary Examiner
Patent abstract
A foldable structure includes: an upper assembly forming an upper portion of the structure; a base assembly forming a lower portion of the structure; a centrally-located hub assembly operatively connected to the base assembly; and a post extending from each corner of the upper assembly to a corner of the base assembly. At least one rotatable wheel assembly is provided at each corner of the lower portion of the structure extending from the structure to engage a surface. Each wheel assembly includes at least one support surface adapted for supporting and guiding the wheel on a surface and at least one groove provided on opposing sides of the support surface.
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