Static molds – Core
Patent
1989-09-18
1991-04-09
Housel, James C.
Static molds
Core
52DIG10, 249 60, 249176, 425192R, 425193, 425396, 425403, B29C 3342, B29C 4526
Patent
active
050058002
ABSTRACT:
A die having a plurality of walls for making a structure includes a die apex, a tetrahedron having tetrahedron edges and a tetrahedron apex that coincides with the die apex, and a hexagonal base located on the opposite end of the die from the die apex. The base is integrated with the tetrahedron such that three walls of the die are parallelograms having parallelogram edges, a first parallelogram vertex of each parallelogram wall intersects the tetrahedron apex, and the opposing second parallelogram vertex of each parallelogram intersects a base vertex. The parallelogram edges are milled down to allow plastic to flow between adjacent edges during a molding process and thereby form a truss structure comprising angled struts. A groove may formed in the parallelogram walls such that the groove joins a third parallelogram vertex with an opposing fourth parallelogram vertex in the parallelogram wall to form horizontal struts in a central portion of the structure.
REFERENCES:
patent: 2780946 (1957-02-01), McGuire
patent: 3290421 (1966-12-01), Miller, Jr.
patent: 3695573 (1972-10-01), Huffaker et al.
patent: 3842768 (1974-10-01), Maistre
patent: 4180232 (1979-12-01), Hardigg
patent: 4235410 (1980-11-01), Nelson
Borrego, John, Space Grid Structures, MIT, 1968, pp. 60, 70, 71.
Housel James C.
Tetrahex, Inc.
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