초록 ▼

A plurality of beams or triangular plates members and beam members form a tetrahedral unit. These units are coupled at their common planes to adjacent facing units to form a foldable, extendible truss beam. Some of the beams are extendible or bendable. By extending or bending, each beam or plate mem

A plurality of beams or triangular plates members and beam members form a tetrahedral unit. These units are coupled at their common planes to adjacent facing units to form a foldable, extendible truss beam. Some of the beams are extendible or bendable. By extending or bending, each beam or plate member folds into a flat or bar shape.

대표청구항 ▼

A jointed extendible truss beam comprising a plurality of tetrahedrons each having six bars and four joints rotatably coupled with the bars to form one unit, only one triangular plane of each of the tetrahedrons being common between adjacent tetrahedrons to form said truss beam; each of said tetrahe

A jointed extendible truss beam comprising a plurality of tetrahedrons each having six bars and four joints rotatably coupled with the bars to form one unit, only one triangular plane of each of the tetrahedrons being common between adjacent tetrahedrons to form said truss beam; each of said tetrahedrons has in a lengthwise direction of said truss beam at least one helical bar forming part of a smallest helical pitch, at least one angle bar forming part of a medium helical pitch, and at least one longitudinal bar forming part of a large helical pitch; at least one of the angle bars in each tetrahedron having an expansion/contraction means for varying its length and locking it into a designated length.