Wireworking – Article making or forming – Electric lamp or electric space discharge device electrode
Patent
1975-03-19
1976-11-23
Larson, Lowell A.
Wireworking
Article making or forming
Electric lamp or electric space discharge device electrode
72149, B21F 4500
Patent
active
039931072
ABSTRACT:
A method of manufacturing bent filaments for incandescent lamps, a core-free filament is seized by its ends. The front end is moved around a mandril which is driven in accordance with the filament bending speed, while the rear end of the filament is moved in a straight line in the direction of the original filament axis.
REFERENCES:
patent: 1214551 (1917-02-01), Karpouich
patent: 1733802 (1929-10-01), Higgins
patent: 3048201 (1962-08-01), Johnson
Larson Lowell A.
Trifari Frank R.
U.S. Philips Corporation
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