ES238929U - Construction system for prefabricated special structures. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Prefabricated spatial structure, being constituted by bars and knots, is essentially characterized in that its bars that are rectilinear tubes of preferably circular section, are closed at the ends by means of ferrules or plugs, which are preferably joined by an annular weld bead or any other system, conventional and that carries a hole concentric with the axis of the bar, the inner part of that bushing being housed in the special circular screw head in whose stem, which emerges to the outside there are two bodies, threads of different diameters and having opposite threads, the threaded body having a diameter smaller than the diameter of the hole of the bushing and the other threaded body located at the end of the head having a threaded pitch identical to that of the holes made in the body. The knot, determining the difference of diameters between both bodies a step that constitutes a support perpendicular away from the screw, said screw being provided with a left-hand thread nut which is coupled to the larger diameter threaded body, and each knot, preferably spherical, and which may be hollow or solid, having a series of geometrically arranged threaded holes, whose axes concur in the geometric center of the knot appearing in each hole a chamfer that surrounds it and that constitutes a seating plane for the step of the screw. (Machine-translation by Google Translate, not legally binding)