Method of making photoflash lamp to prevent shred migration into

Details Method of making photoflash lamp to prevent shred migration into Method of making photoflash lamp to prevent shred migration into

1982-03-01

1984-05-22

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

431360, F21K 502, H01J 940

Patent

active

044499507

ABSTRACT:
A method of making a photoflash lamp wherein an elongated piece of glass tubing is sealed at a first end thereof to secure a pair of lead-in wires therein. Thereafter, a quantity of primer material is positioned within the tubing through the second, open end thereof and deposited on an internal bottom surface of the tubing. A quantity of shredded combustible material (e.g. zirconium) is then air blown within the tubing member, and thereafter a thin member (mica disk) is frictionally inserted through the open end. The tubing member is then restricted, a combustion-supporting atmosphere (e.g., oxygen) introduced therein, and the second open end of the tubing member is sealed (tipped) to define the finished envelope. Use of the disk substantially eliminates the possibility of shred migration into the second open end region during sealing thereof, thus assuring a positive seal at the envelope's tip portion.

REFERENCES:
patent: 2136234 (1938-11-01), Cartun
patent: 3303674 (1967-02-01), Anderson
patent: 3630650 (1971-12-01), Kaufmann
patent: 3823994 (1974-07-01), De Graaf et al.
patent: 4229161 (1980-10-01), Bouchard et al.
patent: 4278310 (1981-07-01), Waymouth et al.

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