Abstract: Disclosed is a system of spherical joints and tubular beams that interconnect to make a spatial reticulate construction based on geometries composed of basic tetrahedral and semi-tetrahedral modules. The joint includes two equal semispherical caps symmetrically organized around a central plate with four or more square fissure sections, joined by a single central screw allowing simultaneous clamping of eight or more hammer terminals at the beam ends. These extremities have a prismatic hammer shape with hexadecagonal base and a multifaceted hemisphere. The frames have a prismatic square section, allowing rotation only in the plane of the board of the joint. The design has a prismatic shape with a square section of multifaceted pole hammer terminals present both on the hammer head and within the caps which eliminates the structural instability that arises in the reticular structure due to the rotation of the beams around the several crux after clamping.

Abstract: The ends of cylindrical girders are provided with spherical members mounted thereto. Sets of twelve, eight or four girders can be connected by a single joint, depending upon the configuration thereof. Each joint includes first and second parts which assemble, by means of a single bolt, to form a structure within which the spherical girder end members are received. The joint parts are provided with openings through which the girders extend. Some of the openings are elongated so that the position of the girders extending therethrough can be varied relative to the joint. The joint parts may be provided with external structural rigidity enhancement members.