| 摘要 |
A framework structure comprises three or more primary constituent units each including two rigid diagonal members constituting the diagonals of a quadrangular lateral face of a solid and coupled together for relative rotation about a first rotation axis passing through the intersection of the diagonals. The primary constituent units are coupled to one another via second and third rotation axes into a ring-like form. A more complicated framework structure can be obtained by using a plurality of these framework structures as secondary constituent units which are coupled to one another with a coupler or a primary constituent unit used in common between adjacent ones of the secondary constituent units. The framework structure can provide one which is capable of being expanded and contracted in threedimensional directions and which has rigidity in any directions.
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