Modular shelf assembly

1. A modular shelf assembly comprising:

a pair of planar panels for defining sides of the shelf assembly, each panel including a first vertical row of spaced apart slots extending through the panel proximate one side edge of the panel;

a second vertical row of spaced apart slots extending through the panel parallel to and spaced apart from said first row of slots;

a third vertical row of spaced apart slots extending through the panel parallel to and spaced apart from said second row of slots, the third row of slots being closer to a second side of the panel than the second row of slots;

shelf supporting rods for extending between and into horizontally aligned slots in the first row of slots in said pair of spaced apart panels, and between and into horizontally aligned slots in second rows of slots in the pair of spaced apart panels, notches proximate the ends of the rods for receiving bottom edges of said slots, whereby the spacing between the pair of panels is maintained and the panels remain parallel to each other;

a plurality of crossbars for extending between the pair of panels and partially through horizontally aligned third slots in the pair of panels, and hooks on the ends of said crossbars for releasably latching the pair of panels together in parallel, spaced apart relationship to each other; and

a plurality of braces for extending diagonally between the pair of panels and partially through vertically spaced apart third slots in the pair of panels, and hooks on the ends of said braces for further releasably latching the pair of panels together.

2. The modular shelf assembly of claim 1 including a shelf backstop for attachment to opposed sides of said pair of spaced apart panels for limited movement of shelves into the area between the pair of spaced apart panels.

3. The modular shelf assembly of claim 2 , wherein said backstop includes an elongated, narrow strip of metal, and a plurality of hooks extending out of one side of said strip for hooking into slots in said third vertical row of slots.

4. The modular shelf assembly of claim 1 , including a fourth vertical row of spaced apart slots proximate a second side edge of each said panel for receiving the ends of said shelf supporting rods; and a fifth vertical row of spaced apart slots between said third and fourth rows of slots for receiving ends of said shelf supporting rods, whereby sets of shelves can be mounted on the rods in back to back relationship to each other.