THERMOS FLASK MANUFACTURING METHOD Russian patent published in 1994 - IPC

FIELD: manufacture of thermos metal flasks with throat provided with thread and annular bead. SUBSTANCE: method involves drawing bottom, upper part of flask and throat from sheet blanks; forming inner bead, rolling thread and cutting bottom in throat; forming edges to be conjugated; joining and welding above mentioned members of flask together. Upper part of flask and throat are drawn from one sheet blank with subsequent calibration and forming of inner bead by rolling simultaneously with rolling of thread, when throat bottom is cut. EFFECT: high quality of thermos flask. 2 dwg