Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1987-05-19
1989-01-31
Kellogg, Arthur
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65110, C03B 2308
Patent
active
048013234
ABSTRACT:
A tubular discharge vessel for a compact low pressure discharge lamp, espally a compact fluorescent lamp, is formed by heating and bending a straight glass tube into a U-shape with a plurality of straight sections and a 180.degree.-bend. Adequate vessel wall thickness is assured at the tubular sections where the bends are formed, by first heating a central section, moving sections lateral to the central section axially toward one another, thereby compressing the heated central section and thickening its walls, and bending or rotating the lateral sections into a parallel orientation. This prevents the bending process from unduly thinning the vessel walls, leading to breakage or rupture under internal gas pressure.
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Eckstein Gerd-Otto
Klein Lutz
Panofski Ernst
Plischke Josef
Schmidt Hans
Kellogg Arthur
Patent Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
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