Connector for variable-curvature spaceframe structural system

Abstract

An improved, economical spaceframe structural system capable of varying curvature is provided, wherein the ends of elongated frame members have fixedly attached headed ends which, in turn, fit into matching recesses in the connector joint. The connector comprises three, disk-like parts which nestle one on top of another on a common axis and which are held together with a single bolt. Each of the three connector parts share interior faces with another part and have matching recesses for joining the frame member ends. Other matching recessed formations on the interior faces of these parts permit the frame members to assume variable angles with respect to the common axis and, by this means, facilitate the property of variable curvature of the spaceframe structure. A minimum of two frame member ends have an improved T-shape which strengthens the connector under tensile forces, enhances the alignment of the framework during assembly, and helps the spaceframe resist racking after erection. An intermediate assembly nut and a location for its placement is provided in the interior of the connector, the use of which, significantly simplifies the assembly process into fewer, more manageable stages. The connector parts and frame member ends have simple forms and are economical to cast or forge. Differently designed frame member ends are provided which adapt and attach to a wide range of frame member materials.