Lamp with improved fuse wire

Details Lamp with improved fuse wire Lamp with improved fuse wire

1981-10-01

1983-11-15

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Load device temperature-modifying means combined with or...

315 73, 315 74, 337290, 337416, 75128R, H01J 744, H01J 1734, H01J 1978, H01J 2996, H01J 112

Patent

active

044158360

ABSTRACT:
In an incandescent lamp having a glass envelope joined to a base member and a filament mounted within the envelope, an improved fuse wire comprises a portion of one or both of the lead-in wires connecting the filament to the base member. The fuse wire is made of an Aluchrom alloy containing Chromium, Nickel and Iron, or is made of a Cronifer alloy containing Chromium, Iron and Aluminum. The Aluchrom or Cronifer fuse wire, upon lamp failure and fuse burnout, exhibits reduced arcing melt-through of the lamp base compared with lamps having prior art fuse wires, for improved safety thereof.
Further the Aluchrom or Chronifer fuse wires have an I.sup.2 t energy rating which permits the use of larger diameter fuse wires which can more readily be processed by lamp production machinery than the smaller diameter lamp fuse wires of prior art materials.

REFERENCES:
patent: 2209005 (1940-07-01), Sittel
patent: 3346768 (1967-10-01), Patsch
patent: 3737717 (1973-06-01), Arendash
patent: 3940728 (1976-02-01), Komatu et al.
patent: 3992161 (1976-11-01), Cairns et al.

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