Method of making a convoluted tubular envelope for a compact ele

Details Method of making a convoluted tubular envelope for a compact ele Method of making a convoluted tubular envelope for a compact ele

1980-02-29

1981-09-08

Kellogg, Arthur D.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65108, C03B 2306

Patent

active

042882397

ABSTRACT:
An efficient fluorescent lamp of high brightness and compact size is provided by forming the envelope from vitreous tubing that is bent into three U-shaped sections which are disposed in mutually perpendicular planes and define a single convoluted discharge channel. The U-shaped sections are so oriented that the legs of the U's are disposed in quadrangular columnar array with the ends of the tubing located adjacent one another and opposite one of the U-bends. Conventional electrode-stem assemblies are sealed into the ends of the bent tubing and the sealed legs are coupled to each other and the proximate U-bend by brace means which rigidifies the multi-section envelope. An efficient method of manufacturing the envelope employing a pair of arcuate molding components and two bending operations that form the three U-bends with only a single tube-heating operation is also disclosed.

REFERENCES:
patent: 1763071 (1930-06-01), Smalley
patent: 1874012 (1932-08-01), Hotchner
patent: 1923148 (1933-08-01), Hotchner
patent: 2135775 (1938-11-01), Walker
patent: 2691853 (1954-10-01), Yoder
patent: 3309187 (1967-03-01), Drangeid
patent: 3514276 (1970-05-01), Fujio et al.
patent: 3993465 (1976-11-01), Hurx et al.

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