Method of making non-shorting photoflash lamp

Details Method of making non-shorting photoflash lamp Method of making non-shorting photoflash lamp

1974-12-20

1976-06-01

Lake, Roy

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

H01J 918

Patent

active

039598608

ABSTRACT:
A method of making beaded lead-in wires for a photoflash lamp comprising the steps of forming and sealing a glass bead around a pair of lead-in wires, positioning a surface of the bead against a die having openings through which the wires extend, and moving the wires a distance through the openings of the die while the bead is hot, said openings having larger diameters than the wires so that said moving of the wires causes glass sheaths to be formed around the wires adjacent to the bead. The technique can be used to sheath one or both wires, above and/or below the bead. A pair of lead-in wires sheathed below the bead is sealed through the base of a lamp bulb, the lower ends of the sheaths being adjacent to the base seal.

REFERENCES:
patent: 2220741 (1940-11-01), Thorson
patent: 2316999 (1943-04-01), Spencer
patent: 2794699 (1957-06-01), Eber
patent: 3501254 (1970-03-01), Nijland et al.
patent: 3823994 (1974-07-01), DeGraaf

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