Patent ID: 7644721

Claim:
A mechanism for supporting a temporary building structure comprising: a first, a second, a third and a fourth linkage, each said linkages being four-bar linkages consisting of two opposed short links and two opposed long links, said short and long links being pivotably interconnected, each linkage being adjacent to at least one other linkage, all adjacent linkages having a common short link, each linkage including a gear intermeshed with the gear of the adjacent linkage; wherein said linkages are arranged to define a folded condition wherein all the opposed long links of the linkages are substantially in parallel and in close proximity to each other; and wherein said linkages are pivoted from said folded condition to a fully opened condition in which said first and said second linkages have a sloped orientation in one direction and said third and fourth linkages have a sloped orientation in the opposite direction to form a peaked roof shape for the mechanism.