Patent ID: 8348207
Filing Date: 2013-01-08
Classification: A47C

Abstract:
1. A foldable supporting device comprising: a plurality of parallel supporting frames that are aligned with each other in a first direction, each of said supporting frames including upper and lower parts that are opposite to each other in a vertical direction transverse to the first direction; and at least one foldable unit disposed between and interconnecting an adjacent pair of said supporting frames, and foldable in the first direction from an extended position to a folded position so as to vary the distance between said adjacent pair of said supporting frames; wherein said foldable unit cooperates with said adjacent pair of said supporting frames to define a foldable assembly, said foldable unit including a pair of crossing members that cross each other so as to be rotatable relative to each other about a first axis, and a joint mechanism having a pair of first joints that are connected respectively to said adjacent pair of said supporting frames and that are aligned in the first direction, and a pair of second joints that are connected respectively to said adjacent pair of said supporting frames, that are aligned in the first direction, and that are respectively aligned with said first joints in a second direction transverse to the first direction, at least one of said pair of said first joints and said pair of said second joints being pivoted to said adjacent pair of said supporting frames so as to be respectively rotatable relative to said adjacent pair of said supporting frames about two second axes, each of said crossing members extending in a transverse direction relative to the vertical direction and interconnecting a respective one of two diagonally aligned pairs of said first and second joints; wherein said pair of said first joints are pivoted respectively to said adjacent pair of said supporting frames so as to be respectively rotatable relative to said adjacent pair of said supporting frames about said second axes, said pair of said second joints being slidable on said adjacent pair of said supporting frames; wherein each of said supporting frames has first and second sides that are opposite to each other in the second direction, and further includes first and second pillars that are disposed at said first and second sides, respectively, that extend in the vertical direction, and that have upper and lower ends, said upper and lower parts extending in the second direction and interconnecting said upper and lower ends of said first and second pillars; wherein said adjacent pair of said supporting frames define a pair of tracks, said pair of said second joints being slidable on said tracks, said upper and lower parts of each of said supporting frames cooperatively defining a respective one of said tracks, said first joints being respectively pivoted to said supporting frames, each of said second joints including a post extending in the vertical direction, interconnecting slidably said upper and lower parts, and slidable on a respective one of said tracks, each of said crossing members being connected to said post of a respective one of said second joints; and wherein the height of each of said pillars of said supporting frames is kept unchangeable during the folding or extending operation of said foldable supporting device.