Support structure of rack

A rack comprising:

• an article-holding piece provided with at least one through hole and one locating bolt;
• and
• at least one support structure fastened at an inner end onto a wall surface for supporting said article-holding piece such that said article-holding piece is located on said support structure by said locating bolt which is fastened onto said support structure via said through hole of said article-holding piece;
• wherein said support structure comprises:
• a suction cup provided in an outer said with a threaded rod fastened therewith;
• a support rod provided with an axial through hole for receiving said threaded rod of said suction cup, said support rod further provided at an inner end with a press disk in contact with said outer said of said suction cup, and at an outer end with a stepped portion smaller in diameter than said support rod whereby said stepped portion is provided in an outer wall with outer threads;
• a rotary ring smaller in outer diameter than said support rod and provided in an inner wall with inner threads, said rotary ring further provided in an outer wall with a threaded hole whereby said rotary ring is rotatably fitted over said stepped portion of said support rod such that said inner threads of said rotary ring are meshed with said outer threads of said stepped portion, and that said rotary ring is turned to align said threaded hole of said rotary ring with said through hole of said article-holding piece;
• and
• a fastening block rotatalby fastened with a free end of said threaded rod of said suction cup whereby said fastening block is turned to exert on said rotary ring, so as to cause said press disk of said support rod to exert a pressure on said suction cup, thereby resulting in an increase in the suction force of said suction cup.