Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-01-23
1977-01-18
DiPalma, Victor A.
Metal working
Method of mechanical manufacture
Electrical device making
29614, H01H 6902
Patent
active
040031292
ABSTRACT:
The fuse is of the type including an electrically insulating cartridge, a pair of electrically conductive terminal caps at opposite ends of the cartridge, a fusible element within the cartridge in electrical contact with the terminals, and a self-supporting bound matrix filler of arc-quenching particulate matter. The improvement comprises that one of the terminal end caps has a filter disposed on its inside end surface over a drain port.
Also disclosed is a method of manufacturing a fuse. The method comprises the steps of assembling the components, packing with arc-quenching particulate matter, filling with a suspension of colloidal silica, removing excess suspension, and drying. In filling, the colloidal silica suspension is forced into a fill port in one end cap and released through a drain port in the other end cap. Before passing out through a drain port in the other end cap, the suspension passes through a filter disposed on the inside end surface of the end cap and overlapping the drain opening.
REFERENCES:
patent: 3465275 (1969-09-01), Swain
patent: 3479630 (1969-11-01), Kozacka
patent: 3810062 (1974-05-01), Kozacka
patent: 3838375 (1974-09-01), Frind et al.
Ceder James H.
Koch Robert E.
DiPalma Victor A.
General Electric Company
Ulbrich Volker R.
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