Bracket support structure

Claim 1

IN A BRACKET SUPPORT FRAME STRUCTURE INCLUDING LATERALLY SPACED, FLOOR-ENGAGING BRACKET SUPPORTING UPRIGHTS HAVING A BRACKET SUPPORTING FRONT WALL AND SIDE WALLS EXTENDING REARWARDLY FROM THE SIDE MARGINS OF THE FRONT WALL, AND FRAME MEMBERS CONNECTED BETWEEN SAID UPRIGHTS, THE IMPROVEMENT COMPRISING: A LEG UNIT REMOVABLY ATTACHED TO EACH OF SAID UPRIGHTS AND EXTENDING FORWARDLY THEREFROM AND HAVING A FLOOR-ENGAGING PORTION AT THE FRONT END THEREOF, THE REAR ENDS OF EACH OF SAID LEG UNITS HAVING AT LEAST ONE PAIR OF LATERALLY SPACED DEPENDING HOOKED EXTENSIONS, THE BRACKET SUPPORTING UPRIGHT ASSOCIATED WITH EACH LEG UNIT HAVING LATERALLY SPACED SLOTS FOR SAID HOOKED EXTENSIONS IN THE FRONT WALL THEREOF, SAID HOOKED EXTENSION OF EACH LEG UNIT PROJECTING INTO ASSOCIATED UPRIGHT SLOTS AND INTERLOCKING WITH THE DEFINING WALLS OF THE LOWER MARGINS THEREOF, AND MEANS PREVENTING THE REMOVAL OF THE HOOKED EXTENSIONS OF EACH LEG UNIT FROM THE ASSOCIATED UPRIGHT SLOTS COMPRISING A PAIR OF HORIZONTALLY ALIGNED, LATERALLY FACING PIN-RECEIVING OPENINGS IN THE SIDE WALLS OF EACH OF SAID UPRIGHTS ADJACENT THE FRON WALL THEREOF, AND A RETAINER PIN PASSING THROUGH THE ALIGNED PIN-RECEIVING OPENINGS OF EACH UPRIGHT IMMEDIATELY ABOVE THE ASSOCIATED HOOKED EXTENSIONS OF THE ASSOCIATED LEG UNIT TO PREVENT THE REMOVAL THEREOF FROM THE ASSOCIATED UPRIGHT SLOTS.