Airtight food container

Abstract

An airtight food container includes a main body and a top cover that correspond to each other in their form and dimensions and, therefore, may be produced by the same mold in an injection molding process. A flange portion is formed at the rim of the main body. One half part of the flange portion is provided with a protrusion while the other half part thereof is recessed. Furthermore, an ear portion having an enlarged surface is formed at the protrusion portion and the recessed portion. Accordingly, one of two completely identical main bodies (the top one) is turned upside down (at 180°) such that the opening is directed downward and a top cover is formed. Besides, the recessed portion and the protrusion portion of the flange portion of the top cover just correspond to the protrusion portion and the recessed portion, respectively, such that the top cover and the main body fit into each other to form an airtight container.

1 . An airtight food container, comprising:
 a) a main body having an opening; and   b) a top cover attached to the opening of the main body;   
     wherein the main body and the top cover is made by the same mold in an injection-molding process, and the top cover and the main body completely corresponds to each other in their form and dimensions, and the main body includes:
 i) a bottom surface; 
 ii) a side wall encircling the bottom surface; and 
 iii) a flange portion formed at the opening rim of the side wall, one half part of the flange portion being provided with a protrusion, at least one ear portion having a greater area being outwardly extended from the protrusion portion, a first projection being formed on the horizontal surface of the ear portion and a second projection being formed on the vertical side thereof; and 
 iv) a recessed portion disposed at one side of the flange portion opposing to the protrusion portion, the form and the structure of the recessed portion being symmetric to that of the protrusion portion in the opposite direction, thereby forming a grooved-and-tongued matching structure, 
 
     whereby one of two completely identical main bodies is turned upside down (at 180°) such that the opening is directed downward and a top cover is formed, and the recessed portion and the protrusion portion of the flange portion of the top cover just correspond to the protrusion portion and the recessed portion, respectively, such that the top cover and the main body fit into each other to form an airtight container. 
   
   
       2 . The airtight food container as recited in  claim 1  wherein the external rim of the protrusion portion is tongued and grooved in a staggered manner like a toothed wheel while the internal rim of the recessed portion at the opposite side is, to the contrary, grooved and tongued in a staggered manner like a toothed wheel. 
   
   
       3 . The airtight food container as recited in  claim 1  wherein the ear portions are formed in a semicircular shape, and wherein the first projections at the horizontal side are also formed in a semicircular shape, and wherein the second projections at the vertical side are formed corresponding to the arched surface of the ear portions. 
   
   
       4 . The airtight food container as recited in  claim 1  wherein the main body and the top cover are made of transparent material in an injection molding process. 
   
   
       5 . The airtight food container as recited in  claim 1  wherein the top cover is made of transparent material in an injection molding process while the main body is made of nontransparent material in an injection molding process.