Patent ID: 8550868

Claim:
An assembly unit for an assembly toy, the assembly unit comprising a first tube connector and a second tube connector, each of the tube connectors comprising: a semispherical or cylindrical body having a horizontal surface; a hole perforated through the center of the body perpendicular to the horizontal surface, and at least one coupling rib outwardly extending from an outer surface of the body, wherein the at least one coupling is configured to allow a tube to be inserted thereon, wherein the first tube connector is coupled with the second tube connector such that the horizontal surface of the first tube connector and the horizontal surface of the second tube connector are alternately coupled and come into contact with each other, and wherein the horizontal surface of the first tube connector is rotatable clockwise or counterclockwise with respect to the horizontal surface of the second tube connector, wherein during rotation, the horizontal surface of the first tube connector is in contact with the horizontal surface of the second tube connector.