METALLIC VACUUM BOTTLE, PRODUCTION METHOD OF METALLIC VACUUM BOTTLE, METALLIC VACUUM BOTTLE PRODUCED BY METALLIC VACUUM BOTTLE PRODUCTION METHOD

摘要

PURPOSE: To eliminate a seal piece holding mechanism, a steplike concave part and a facility to turn over inner and outer tubes, for a metallic seal piece covering a small hole set on an inner or outer tube, by sealing the periphery of the protruded side face of the seal piece and the periphery of the small hole with a metallic soldering material by heat treating in a vacuum heater. ;CONSTITUTION: A small hole 4 is bored in an outer tube 2, an inner tube 1 is inserted into the outer tube 2 and turned over, a metallic soldering material 7 is heaped up around the small hole 4, a protrusion 5 protruded on a metallic seal piece 6 is inserted into the small hole 4, and all of them are stored in a vacuum heating furnace. The protrusion 5 can be inserted into the small hole 4 by a cone shaped expansion part 5a on its tip and does not slip off by the air pressure in evacuating a space 3, and the protrusion 5 become possible to shake by thinning its base part 5b. When air is evacuated from between the small hole 4 and the protrusion 5 to make the space 3 vacuum, a sealing piece 6 drops on the small hole 4 by self weight. Thus, by heating, a metallic soldering material 7 is molten to solder the periphery of the side face of the protrusion 5 of the sealing piece 6 and the periphery of the small hole 4.;COPYRIGHT: (C)1995,JPO