Abstract: A modular rack includes a pair of lateral frame portions with opposing inner surfaces, a shelf plate and four corner pieces. Each of the lateral frame portions includes two upright post units, each of which includes two upright pillars that cooperatively define a slot therebetween. Each of the lateral frame portions further includes a horizontal linking rod which interconnects the post units and which has an inner surface at the same side as the inner surface of the corresponding one of the lateral frame portions. Each of the corner pieces has a bottom wall, a top wall, and first and second side walls which interconnect the top and bottom walls. The first side wall extends in a direction transverse to the linking rod. The top and bottom walls and the first and second side walls cooperatively define a corner space thereamong for receiving a corner of the shelf plate therein.

Abstract: A modular rack includes at least three spaced post units, a plurality of tubular sleeves and a plurality of trays. Each of the post units includes a hollow upper post, a cylindrical connector, and a hollow lower post. Each of the upper and lower posts has an outer surface formed with a plurality of annular peripheral grooves. The connector threadedly interconnects the upper and lower post. The connector further includes a radially protruding flange portion between the upper and lower posts. The flange portion has an outer diameter smaller than that of the upper and lower posts and cooperates with the upper and lower posts to form an annular retaining groove. The tubular sleeves are sleeved on the post units. Each of the tubular sleeves is formed with a radial inward protrusion which extends into a selected one of the peripheral and retaining grooves in the upper and lower posts.