Modular shelving

An adjustable shelving assembly comprising:

• four corner members of L-shaped cross section, each corner member comprising two halves, and either half of each corner member comprising a plurality of spaced aperture members formed lengthwise, each aperture member including an upper, larger circle and a lower, smaller, vertical hole overlapping the larger circle thereof;
• at least one group of four interconnecting members, each interconnecting member comprising 90-degree bent sides, upper and lower aperture elements and a through hole besides each of the upper and lower aperture elements for positioning the interconnecting member, each aperture element comprising an upper, smaller, vertical hole and a lower, larger circle overlapping the vertical hole thereof;
• a plurality of elongated retainers each comprising two enlargements at both ends respectively, an annular groove adjacent to one enlargement, and an annular shoulder between the groove and the other enlargement wherein the aperture element is upside down relative to the aperture member such that the aperture element and aperture member are inverted relative to each other, a diameter of either enlargement is smaller than either a diameter of the larger circle of the aperture member or a diameter of the larger circle of the aperture element, and the diameter of either enlargement is larger than either a diameter of the vertical hole of the aperture member or a diameter of the vertical hole of the aperture element;
• a plurality of lock pins each comprising a head including a cut, and a shaft extending from the head wherein the shaft of the lock pin has a diameter about equal to a diameter of the through hole and a length greater than a length of the through hole;
• and
• at least one flat shelf each disposed on the 90-degree bent sides of the interconnecting members of the same group;
• wherein the groove of the retainer is clamped by the vertical hole of the aperture member, the interconnecting member is engaged with the corner member, the shoulder of the retainer is clamped by the vertical hole of the aperture element, the corner member and the interconnecting member are retained by the retainer, a substantial portion of the lock pin is fastened in the larger circle of the aperture member and the through hole, and the cut is partially in the larger circle of the aperture element and urges against the top of the enlargement of the retainer for fastening.