Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For filament
Patent
1995-05-19
1997-10-21
Patel, Nimeshkumar
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For filament
313315, 313341, 313344, 313578, 313579, H01J 102
Patent
active
056800037
ABSTRACT:
An improved coiled-coil filament for use in an incandescent lamp has a primary coil winding with a substantially uniform spacing between successive coil turns. The primary coil winding is wound around a second mandrel in a manner to provide a main coil body and leg portions extending therefrom. A helical bend is formed between the main coil body and the leg portions thereby allowing that the leg portions extend toward a seal region of the lamp envelope in a substantially parallel relation to each other. Once the main coil body has been set in shape, the first and second mandrels are removed such that the leg portions are disposed in the seal region of the lamp envelope in a spaceless, and optional spudless manner. In manufacturing the spaceless, spudless coiled-coil filament of the present invention, several manufacturing steps are avoided including the steps of Picco or wax dipping the ends of the leg portions to allow for the formation of the previously required spud members, and of removing the Picco or wax dip after the remainder of the primary mandrel has been dissolved.
REFERENCES:
patent: 2258158 (1941-10-01), Lowry
patent: 3767959 (1973-10-01), George et al.
patent: 4683397 (1987-07-01), Johnson, Jr.
Hartwick Robert W.
Kellner Robert J.
Lagermasini, III Joseph P.
Rachel Bernard W.
General Electric Company
Hawranko George E.
Patel Nimeshkumar
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