Method for the manufacture of vacuum tubes stems

Details Method for the manufacture of vacuum tubes stems Method for the manufacture of vacuum tubes stems

1987-11-25

1989-07-11

Rowan, Kurt

Electric lamp or space discharge component or device manufacturi

Process

Combined, e.g., with shaping of lamp or device envelope

65 55, H01J 900

Patent

active

048467464

ABSTRACT:
A method of manufacturing stems for vacuum tubes is disclosed. The method makes it possible, in particular, to improve the quality of the seal between the metallic bushings and the glass of the stem. The method consists in loading a bottom mold with a first glass piece and a second glass piece and metallic conductors, and then in heating the glass pieces before pressing them against each other between the bottom mold and the top mold. According to one characteristic of the invention, the first piece, which constitutes an external piece partially fixed in the bottom mold, is directly heated only on an upper part which is not fixed, and the two glass pieces are pressed against each other as soon as the upper part has reached a so-called working temperature in order to prevent prolonged contact between the upper part and a limited surface of the conductors.

REFERENCES:
patent: 2030185 (1936-02-01), Rose
patent: 2318652 (1943-05-01), Wiener
patent: 2342609 (1944-02-01), Ellefson
patent: 2345278 (1944-03-01), Monack
patent: 2374269 (1945-04-01), Breadner et al.
patent: 2497545 (1950-02-01), Greiner
patent: 2671291 (1954-03-01), Daley
patent: 2817927 (1957-12-01), Cowley
patent: 3477835 (1969-11-01), Brill et al.

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