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US 4,225,840 AGranted
Electric fuse with support for helically wound fusible element
AssigneeGould Inc.
InventorPhilip C. Jacobs, Jr.
Life of this patent
Estimating the term…
Abstract
A non gas evolving insulating support of generally star shaped X-sect for supporting the turns of a helically wound fusible element is provided with gas evolving means affixed thereto in proximity with but spaced from the fusible element.
Claims8
An electric fuse comprising:
- (a) a casing of electric insulating material;
- (b) a pair of terminals closing the ends of said casing;
- (c) a pulverulent arc-quenching filler disposed within said casing;
- (d) a helically wound fusible element conductively interconnecting said pair of terminals;
- (e) a non gas evolving support for said fusible element extending in a direction longitudinally of said casing, said support being immersed in said arc-quenching filler and comprising a core and a plurality of ribs protruding from said core;
- and
- (f) gas evolving means affixed to said support between adjacent ribs of said core and spaced from said fusible element so as to be essentially unaffected by temperatures lower than arc-temperatures, said gas-evolving means evolving an arc extinguishing gas upon conversion of said fusible element into an arc incident to blowing of said fuse.
4 more elements
Dependencies are inferred from the claim text.