Modular rack assembly

A modular rack assembly comprising:

• a support rod module including a plurality of upright support legs spaced apart from each other, each of said upright support legs having at least two first hole units spaced apart from each other in a top-bottom direction, and a plurality of second holes that are disposed between said at least two first hole units and that are spaced apart from each other in the top-bottom direction;
• and
• a shelf module removably mounted to said support rod module, and including
• two first shelf units which are spaced apart from each other in the top-bottom direction and each of which is removably engaged to a corresponding one of said at least two first hole units of each of said upright support legs, each of said first shelf units including a plurality of position-limiting members each of which is removably engaged to a corresponding one of said at least two first hole units of a respective one of said upright support legs, a first shelf plate disposed among said upright support legs, and a plurality of sleeves that are connected to said first shelf plate and that are removably and respectively sleeved on said position-limiting members such that downward removal of said sleeves from said position-limiting members is prevented, and
• at least one second shelf unit being removably engaged to ones of said second holes of said upright support legs which are at a same height, said at least one second shelf unit including a second shelf plate that is disposed among said upright support legs and that has a plurality of insertion holes open downwardly, and a plurality of supporting members that are removably and respectively engaged to said ones of said second holes at the same height and that are respectively inserted into said insertion holes to support said second shelf plate;
• wherein each of said position-limiting members has two tube halves that are open toward each other and that abut against each other to form a tube, and two protrusion units that respectively protrude from inner surfaces of said tube halves toward each other and that are removably engaged with said corresponding one of said at least two first hole units, an outer dimension of each of said position-limiting members being increased downwardly, an inner dimension of each of said sleeves of each of said first shelf units being increased downwardly, each of said sleeves abutting downwardly against and being positioned to a corresponding one of said position-limiting members;
• and
• wherein each of said upright support legs is a square tube, and has two first walls opposite to each other in a first direction and two second walls which are spaced apart from each other in a second direction transverse to the first direction and each of which is connected between said first tube walls, each of said upright support legs including four of said first hole units, each of said first walls having two of said first hole units spaced apart from each other in the top-bottom direction, each of said tube halves of each of said position-limiting members having a positioning portion that is widened downwardly and that has a corresponding one of said two protrusion units, and two abutting portions that are respectively connected to two ends of said positioning portion opposite to each other in the second direction and that extend toward the other one of said tube halves, said two tube halves of each of said position-limiting members being interconnected in such a manner that said abutting portions of one of said two tube halves abut respectively against said abutting portions of the other one of said two tube halves.