Patent ID: 6264092
Filing Date: 2001-07-24
Classification: B23K,E04B,Y02A,Y02B

Abstract:
A method of sealing a metal vacuum structure for evacuating a space closed by component members through an evacuation port and then sealing the evacuation port, the method comprising:forming a brazing-material placing recess in one of the component members, the brazing-material placing recess opening downward when the structure is set for evacuation;forming an aperture in the brazing-material placing recess;placing brazing material, in molten state, in the brazing-material placing recess in such a way as to block the aperture and fixing the brazing material;forming an evacuation port in the brazing material;fixing a drop preventing member having a through hole on the component member in opposed relation to the brazing material;evacuating the space closed by the component members through the evacuation port of the brazing material;melting the brazing material; andmaking the evacuation port disappear to seal it by melting the brazing material as the drop preventing member prevents the brazing material from dropping.