A - Human Necessities – 63 – F
Patent
A - Human Necessities
63
F
A63F 9/08 (2006.01) A63H 33/10 (2006.01) E04B 1/32 (2006.01)
Patent
CA 2292161
Reversibly expandable structures are formed from loop assemblies comprising interconnected pairs of polygonal shaped links. Each loop assembly has polygon links with at least three pivot joints and at least some of the polygon links have more than three pivot joints. Additionally, these links lie essentially on the surface of the structure or parallel to the plane of the surface of the structure. Each polygon link has a center pivot joint for connecting to another link to form a link pair. Each link also has at least one internal pivot joint and one perimeter pivot joint. The internal pivot joints are used for connecting link pairs to adjacent link pairs to form a loop assembly. Loop assemblies can be joined together and/or to other link pairs through the perimeter pivot joints to form structures. In one preferred embodiment of the present invention link pairs may be connected to adjacent link pairs in a loop assembly through hub elements that are connected at the respective internal pivot joints of the two link pairs. Similarly hubs elements can be used to connect loop assemblies together or loop assemblies to other link pairs through the perimeter pivot joints. In yet another embodiment of the present invention the pivot joints can be designed as living hinges.
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