Lamp filament support construction

Details Lamp filament support construction Lamp filament support construction

1988-12-16

1989-09-19

Ramsey, Kenneth J.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For filament

445 32, 174138R, 174177, 29631, H01J 918, H01K 118

Patent

active

048684511

ABSTRACT:
A method of constructing a filament support member from a single-piece preformed refractory metal wire having at least one loop protrusion formed in the wire and positioned between the ends of the wire. A section of glass tubing is positioned over and supported by the loop protrusion with a head portion of the loop extending beyond the section of tubing. Heat is applied to melt the section of tubing to form an insulating bead at the base of said loop protrusion. The head portion of the loop protrusion is then trimmed to interrupt electrical continuity in the wire and thus electrically isolate the respective ends of the wire.

REFERENCES:
patent: 1590164 (1926-06-01), Harrington
patent: 2064490 (1936-12-01), Noble
patent: 2693024 (1954-11-01), Wold
patent: 3930177 (1975-12-01), Marton

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