Plastic frame system having a triangular support post

A system for supporting a shelf having a periphery that defines at least one corner and an interior and an exterior of the shelf, said system comprising:

• a corner bracket mounted with each said corner of said shelf and having a face portion having at least one surface inclined downwardly and inwardly with respect to said shelf interior;
• at least one collar having two sides that define a generally right angular apex;
• means for mounting each said collar with one said corner bracket thereby to form an open sleeve having a generally right triangular cross-section, at least a major part of said face portion defining the hypotenuse and said sides of said collar defining the adjacent sides of said generally right triangular cross-section;
• a support post and a wedge member that together form an assembly defining two side surfaces, forming a generally right angular apex, and a hypotenuse surface, said side surfaces and said hypotenuse surface of said assembly defining a generally right triangular cross-section congruent to the cross-section of said sleeve, said assembly thereby being formed to be received in said sleeve;
• said wedge member having at least one inclined wedge portion complementary to said inclined surface of said face portion;
• and
• means for mounting said wedge member at a fixed location on said support post, thereby forming said assembly, and adjacent said face portion of said corner bracket with said inclined wedge portion of said wedge member inclined downwardly and inwardly with respect to said shelf interior;
• whereby downward movement of said shelf relative to said assembly, received in said sleeve, causes said wedge portion of said wedge member and said inclined surface of said face portion tightly to engage thereby to urge said generally right angular apex of said assembly into tight engagement with said generally right angular apex of said collar and said side surfaces of said assembly into tight engagement with said sides of said collar.