Merchandise display shelf

Claim 1

IN A MERCHANDISE DISPLAY SHELF OR THE LIKE, THE COMBINATION OF: A FLAT RECTANGULAR SHEET OF METAL FORMING THE SUPPORTING SURFACE OF SAID SHELF; AND REINFORCING MEANS FOR RIGIDIFYING SAID SHEET OF METAL AND INCLUDING AT LEAST TWO RIBS FORMED INTEGRALLY DOWNWARDLY FROM THE MATERIAL OF SAID SHEET, EACH OF SAID RIBS HAVING FLAT SIDE WALLS AND A FLAT BOTTOM WALL WHICH ARE RELATED TO GIVE SAID RIB A TRIANGULAR CROSS SECTION WITH SAID SIDE WALLS UNITING WITH MARGINAL PORTIONS OF SAID SHELF AT SHARP ACUTE ANGLES AND WITH UPPER EDGES OF SAID SIDE WALLS SUBSTANTIALLY IN CONTACT AND WITH SAID SIDE WALLS UNITING WITH SAID BOTTOM WALL AT RELATIVELY SHARP ACUTE ANGLES, ONE OF SAID RIBS BEING DISPOSED NEAR EACH OF TWO PARALLEL EDGES OF SAID SHELF, THERE BEING NOTCHES APPROXIMATELY HALF THE DEPTH OF SAID RIBS FORMED UPWARDLY IN SAID RIBS NEAR THEIR ENDS AT THE OTHER PARALLEL EDGES OF SAID SHELF; A PAIR OF SHALLOW SHEET METAL ARMS, THE PLANES OF SAID SHEET METAL ARMS BEING DISPOSED VERTICALLY, UPPER EDGES OF SAID ARMS BEING HORIZONTAL AND EXTENDING UPWARDLY INTO SAID NOTCHES AND ENGAGING THE BOTTOM THEREOF AT THE UPPER ENDS OF SAID NOTCHES, TO SUPPORT SAID SHELF WITH SAID SHELF AND ARMS HAVING A RELATIVELY SMALL OVERALL DEPTH; AND MEANS ON SAID ARMS EXTENDING UPWARDLY ABOVE THE BOTTOMS OF SAID NOTCHES TO ENGAGE AT LEAST ONE OF SAID RIBS IN THE PLANES OF SAID ARMS TO LIMIT HORIZONTAL MOVEMENT OF SAID SHELF PARALLEL WITH SAID ARMS.