Method for the manufacture of vacuum tubes stems
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United States of America Patent
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-
Jul 11, 1989
Grant Date -
N/A
app pub date -
Nov 25, 1987
filing date -
Nov 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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