Continuous spherical truss construction

• US 4,719,726 A
• Filed: 04/14/1986
• Issued: 01/19/1988
• Est. Priority Date: 04/14/1986
• Status: Expired due to Fees

• Current Assignee: Helmut Bergman
• Original Assignee: Helmut Bergman
• Inventors: Bergman, Helmut
• Primary Examiner(s): Pate, III, William F.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/851,934
• Time in Patent Office: 645 Days
• Field of Search: 52/81, 52/DIG. 10
• US Class Current: 52/81.4
• CPC Class Codes: E04B 1/3211 Structures with a vertical rotation axis or the like, e.g. semi-spherical structures
• CPC Class Codes: E04B 2001/3294 with a faceted surface
• CPC Class Codes: Y10S 52/10 Polyhedron

Abstract

My invention relates to a tetrahedral-octahedral truss construction system for shell framework of icosahedral-spherical, and/or part-spherical structures, which are based on the regular icosahedron. The system is represented by a central nucleus and by a sequentially ordered infinite set of ever-increasing, space-filling truss layer shells, which are constructed from triangular units of equal size, equal angular values and identical proportions. Icosahedral-spherical truss shells can be constructed of single, double and multiple layers.

Claims

1. A truss structure comprising at least one octahedral rosette formed from five octahedrons each having a face joined to a face of an adjacent octahedron, the octahedrons being disposed in a ring around a node at which an apex of each of the octahedrons is joined, the octahedral rosette defining a pentagonal recess in its outer side, and associated with each octahedral rosette, a tetrahedral rosette formed from five tetrahedrons each having a face joined to a face of an adjacent tetrahedron, the tetrahedrons being disposed in a pentagonally shaped cluster with an edge of each joined face being joined to a corresponding edge of each other joined face and with opposite ends of the joined edges forming an inner and an outer apex, the tetrahedral rosette being joined to the octahedral rosette with which it is associated and fitting in the pentagonal recess in close packing fashion therein.

2. A truss structure according to claim 1 formed from a plurality of said octahedral rosettes with the node of each octahedral rosette, and the inner and outer apices of the associated tetrahedral rosette, falling on a different radius, each radius passing through a different vertex of an icosahedron.

3. A truss structure according to claim 1 comprising a plurality of said octahedral rosettes joined to form contiguous concentric spheroidal layers with each layer of equal thickness and with the node of each octahedral rosette of a layer coincident with a complementary outer apex of the tetrahedral rosette of a layer disposed immediately inwardly thereof.

4. A truss structure according to claim 1 in which each tetrahedron has three congruent faces each in the shape of an isosceles triangle, two of which are each joined to an adjacent tetrahedron of the cluster, and a base in the form of an equilateral triangle, each base in the cluster being disposed toward the outer apex of the cluster.

5. A truss structure according to claim 1 in which each octahedron has six congruent faces, each in the shape of an isosceles triangle, two of which are each joined to an adjacent octahedron of the at least one octahedral rosette, and two faces each in the form of an equilateral triangle, with one face aligned toward the outer side of the at least one octahedral rosette and one face aligned toward the inner side of the at least one octahedral rosette.

6. A truss structure according to claim 4 in which the ratio of twice the length of the bisector between the two equal sides of each isosceles triangle to the length of the unequal side is the golden ratio.

7. A truss structure according to claim 5 in which the ratio of twice the length of the bisector between the two equal sides of each isosceles triangle to the length of the unequal side is the golden ratio.