Method for manufacturing a shell of a metallic cabinet

Abstract

A shell of a metallic cabinet is made by means of folding two ends of a metal plate form fitting portions at the two ends, bending the metal plate and making the fitting portions engage each other to change the metal plate into a semi-finished shell, pressing the fitting portions against each other such that the fitting portions become flat to closely touch each other, and bending upper and lower ends of the semi-finished shell inwards to form inward annular fitting protrusions thereon, shaping the semi-finished shell by means of exerting outward force on inner portions of the semi-finished shell, and punching a front side of the semi-finished shell to form an opening; a cover and a base are respectively secured to the upper and the lower ends with bumps, which are formed near to edges of the cover and the base, engaging the fitting protrusions of the shell.

1 . A method for manufacturing a shell of a metallic cabinet, comprising following steps: 
 (1) folding two ends of a metal plate to form fitting portions at the two ends;    (2) bending the metal plate and making the fitting portions engage each other to change the metal plate into a semi-finished shell;    (3) pressing the fitting portions against each other such that the fitting portions become flat and closely touch each other, plus bending upper and lower ends of the semifinished shell inwards to form inward annular fitting protrusions thereon;    (4) shaping the semi-finished shell by means of exerting outward force on inner sides of the semi-finished shell; and    (5) punching a front side of the semi-finished shell to form an opening thereon.    
   
   
       2 . The method as claimed in  claim 1 , wherein an upper cover is secured on the upper end of the shell, and a base is secured on the upper end of the shell; the upper cover having a plurality of engaging bumps spaced apart near to an edge and engaged with the fitting protrusion of the upper end of the shell; the base having a plurality of engaging bumps spaced apart near to an edge and engaged with the fitting protrusion of the lower end of the shell.  
   
   
       3 . The method as claimed in  claim 1 , wherein the shell is used together with drawers, which are passed to the shell through the opening.  
   
   
       4 . The method as claimed in  claim 1 , wherein the shell is used together with an inner shell, which is held in the shell, and in which drawers are held.  
   
   
       5 . The method as claimed in  claim 1 , wherein an upper cover and a base are respectively secured on the upper and the lower ends of the shell, and the shell is equipped with a door, which is pivoted to those portions of the upper cover and the base that project out beyond a front side of the shell.