Stacking ring for molded plastic milk crate

Claim 1

IN A MATERIAL HANDLING CRATE HAVING SIDE PANELS AND A MOLDED PLASTIC BOTTOM PANEL, A STACKING RING ON SAID BOTTOM PANEL COMPRISING, A PLASTIC LEDGE MOLDED INTEGRALLY WITH AND PROJECTING DOWNWARDLY BELOW THE BOTTOM SURFACE OF SAID BOTTOM PANEL TO SUPPORT SAID CRATE ON A SUPPORTING SURFACE WITH SAID BOTTOM PANEL SPACED THEREFROM, SAID LEDGE EXTENDING IN INWARDLY SPACED PARALLEL RELATION TO EACH SIDE EDGE OF SAID CRATE, AN UPWARDLY EXTENDING CHANNEL FORMED IN THE BOTTOM SURFACE OF SAID LEDGE AND EXTENDING SUBSTANTIALLY THE FULL LENGTH THEREOF ALONG SUCH SAID SIDE EDGE TO DIVIDE SAID LEDGE INTO A PAIR OF SUBSTANTIALLY PARALLEL RAILS ALONG SIDE EDGES AND INTEGRALLY JOINED AT THEIR UPPER EDGES, AND A METALLIC INSERT FIXEDLY SECURED WITHIN EACH SAID CHANNEL, SAID INSERT EXTENDING SUBSTANTIALLY THE FULL LENGTH OF EACH SAID CHANNEL AND FORMING AT LEAST A PORTION OF THE BOTTOM BEARING SURFACE OF SAID STACKING RING.