Rotary joint, framework construction kit and method for manufacturing a rotary joint

A framework construction kit comprising:

• at least one rotary joint comprising:
• a socket rod having a socket rod flange with an at least partly spheroid concave bearing surface at a first end;
• a housing nut encircling the socket rod and having a threaded wrenching head;
• and
• a ball rod integrally formed to have an at least partly spheroid convex bearing surface with threaded side walls formed around the convex bearing surface,
• wherein a diameter of the threaded side walls of the ball rod corresponds to a diameter of the threaded wrenching head of the housing nut;
• and
• at least one interconnection strut connected to a second end of the socket rod of the at least one rotary joint or connected to the ball rod.

A framework, comprising:

• a plurality of rotary joints attached to a plurality of bearing structures, each of the plurality of rotary joints comprising:
• a socket rod having a socket rod flange with an at least partly spheroid concave bearing surface at a first end;
• a housing nut encircling the socket rod and having a threaded wrenching head;
• and
• a ball rod integrally formed to have an at least partly spheroid convex bearing surface with threaded side walls formed around the convex bearing surface,
• wherein a diameter of the threaded side walls of the ball rod corresponds to a diameter of the threaded wrenching head of the housing nut;
• and
• a plurality of interconnection struts, each connected to the socket rods or the ball rods of the plurality of rotary joints.

A method for manufacturing a rotary joint, the method comprising:

• integrally forming a socket rod having a socket rod flange with an at least partly spheroid concave bearing surface at a first end simultaneously with a housing nut, such that the housing nut encircles the socket rod and has a threaded wrenching head, using a 3D printing or additive manufacturing (AM) technique;
• forming a ball rod having an at least partly spheroid convex bearing surface that is integrally formed with threaded side walls around the convex bearing surface using a 3D printing or AM technique;
• and
• threadingly engaging the threaded wrenching head of the housing nut with the threaded side walls of the ball rod, thereby housing the socket rod flange within the housing nut and against the ball rod.