Education and demonstration – Mathematics – Geometry – trigonometry – or physical mathematic model structure
Patent
1985-11-20
1987-10-20
Grieb, William H.
Education and demonstration
Mathematics
Geometry, trigonometry, or physical mathematic model structure
434278, 434403, 446126, G09B 2304
Patent
active
047011319
ABSTRACT:
A geometrical structural system is made up of a plurality of nodes and shape-coded connectors extending therebetween, each node having a plurality of outer polygonal elements. The outer edges of each element are bordered by end edges of other elements and each element has an opening therethrough corresponding to the outer side edges of each element. Each opening extends radially into a hollow space centrally of each node. The connectors are elongated and have opposed connecting ends with a cross-sectional configuration corresponding to a cross-sectional configuration of an opening in one of the element faces for insertion therein. The steps involved in making the nodes includes tooling a pair of mold halves with interior cavities; fastening the halves together with the interior cavities confronting one another to form a common cavity symmetrical about their center; positioning slides in the common cavity, each slide corresponding to the cross-sectional configuration of a polyhedral face to be formed in the outer shell but smaller in cross-sectional size than the polyhedral face; injecting a moldable material to fill the common cavity and remaining voids between the slides; followed by withdrawing the slides from the mold cavity and disconnecting the mold halves for removal of a one-piece node.
REFERENCES:
patent: 2861388 (1958-11-01), Favaretto
patent: 3341989 (1967-09-01), Emmerich
patent: 3367063 (1968-02-01), Bondesen
patent: 3510962 (1970-05-01), Sato
patent: 3600825 (1971-08-01), Pearce
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patent: 4348830 (1982-09-01), Hagberg
Cundy and Rollett, "Mathematical Models", Oct. 1958, p. 105, Only to Rhombicosidodecahedron.
Hildebrandt Paul R.
Pelletier Marc G.
Grieb William H.
Reilly John E.
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