Plastic lunch box

Abstract

A plastic lunch box is disclosed that includes a tray including a raised, flat bottom wall, a raised, staged edge including a lower first shelf, an upper second shelf of inverted U-section, and a bent intermediate section interconnecting the first and second shelves, and a substantially L-shaped member interconnecting the bottom wall and the edge; and a cover including a closed inner groove on a top, a raised top wall defined by the inner groove, an edge of inverted-U section, and a closed outer groove proximate the edge; whereby snapping the cover onto the tray will securely engage the outer groove with an upper portion of the intermediate section and securely engage the edge of the cover with the second shelf. The lunch box has a sufficient structural strength and can be manufactured in a cost effective process.

1 . A plastic lunch box comprising:
 a tray including a raised, flat bottom wall, a raised, staged edge including a lower first shelf, an upper second shelf of inverted U-section, and a bent intermediate section interconnecting the first and second shelves, and a substantially L-shaped member interconnecting the bottom wall and the edge; and   a cover including a closed inner groove on a top, a raised top wall defined by the inner groove, an edge of inverted-U section, and a closed outer groove proximate the edge;   whereby snapping the cover onto the tray will securely engage the outer groove with an upper portion of the intermediate section and securely engage the edge of the cover with the second shelf.   
   
   
       2 . The plastic lunch box of  claim 1 , wherein the cover is of substantially rectangular. 
   
   
       3 . The plastic lunch box of  claim 1 , wherein the tray is of substantially rectangular. 
   
   
       4 . The plastic lunch box of  claim 1 , wherein the bottom wall is of substantially rectangular. 
   
   
       5 . The plastic lunch box of  claim 1 , wherein the top wall is of substantially rectangular.