Double-walled metallic vacuum container

Abstract

A metallic double-walled vacuum container is provided which improves heat insulating property and resistance to vibration. It has a metallic inner shell and an outer shell. The end face of the inner shell is constricted so as to rise inwardly. The inner end of a mouth pipe is inserted into and joined to the constricted portion to form a mouth portion of the inner shell and the outer end of the mouth pipe is joined to the outer shell.

What is claimed is:  
     
         1 . A metallic double-walled vacuum container comprising a metallic inner shell, a metallic outer shell having a mouth portion and an end face at an open side, a space formed between said inner and outer shells being evacuated, said inner shell having an end face at an open side constricted to form a constricted portion rising inwardly, a mouth pipe having an inner end thereof inserted into and joined to said constricted portion, said mouth pipe having an outer end thereof joined to the mouth portion of said outer shell.  
     
     
         2 . The metallic double-walled vacuum container as claimed in  claim 1  wherein an annular hollow space is provided around said constricted portion by providing the end face of said inner shell close to the end face of said outer shell.  
     
     
         3 . The metallic double-walled vacuum container as claimed in  claim 1  or  2  wherein a heat insulating member for preventing direct contact of said inner shell with said outer shell is provided on the outer periphery of at least one of the top and bottom ends of the trunk of said inner shell.  
     
     
         4 . A metallic double-walled vacuum container comprising a metallic inner shell having a mouth portion, a metallic outer shell having a mouth portion, the mouth portion of said inner shell being joined to the mouth portion of said outer shell, a space formed between said inner and outer shells being evacuated, a plug member fitted in the mouth portion of said inner shell, a presser plate in abutment with said plug member, and a bracket fixed to the outer periphery of said outer shell, said presser plate being coupled to said bracket.  
     
     
         5 . A metallic double-walled vacuum container comprising a metallic inner shell having a mouth portion, a metallic outer shell having a mouth portion, the mouth portion of said inner shell being joined to the mouth portion of said outer shell, a space formed between said inner and outer shells being evacuated, said outer shell having a cylindrical portion at lower end of its mouth portion, said cylindrical portion being disposed around the mouth portion of said inner shell and having its lower end joined to the mouth portion of said inner shell, a plug member fitted in the mouth portion of said inner shell, a presser plate in abutment with said plug member, and a bracket fixed to the outer periphery of said outer shell, said presser plate being coupled to said bracket.