Method of forming a shaped fluorescent light bulb envelope
OwnerOsamu Kawamurainventor
Life of this patent
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Abstract
An elongated envelope for a fluorescent light bulb is held at each of its ends, and heated to a degree by which it is bendable. The ends are then moved relatively to each other in a path by which they are turned inwardly in opposition to each other and toward the center portion of the envelope while being directed out of the plane of the center portion to in part overly the center portion.
Claims5
A method of forming a shaped fluorescent light bulb comprising the steps of supporting a tubular envelope blank of defined length at each of its ends within a respective holder, heating said elongated envelope blank to a degree permitting the bending of the ends with respect to its central portion, maintaining one of said holders in stationary position and moving the other of said holders relative to said one holder in a planetary path of approximately 250.degree. with respect to the stationary holder by which the associated ends of said tubular envelope blank are turned in the same direction, relatively inward in opposition to each other and are directed toward said center portion and out of the plane of the center portion, continuing the movement of said other holder until the ends of said tubular envelope blank at least in part overly the center portion, are symmetrical and lie at least in part parallel to each other, removing said envelope blank from said holders and thereafter installing electrical connectors to each end and sealing said envelope blank to form a light bulb.
Dependencies are inferred from the claim text.