Two bars are hinged together at their midpoints to form scissors. You can bend the bars at the hinge to produce a cross similar to the Hoberman linkage. Such scissors are arranged in a circle and similar circles are stacked to make an extendable tower. If the bars connecting the base nodes are shortened, then the tower is extended.
N. De Temmerman, "Design and Analysis of Deployable Bar Structures for Mobile Architectural Applications", PhD thesis, Vrije Universiteit Brussel, 2007.
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