Electric fuse and method of manufacturing the same

Details Electric fuse and method of manufacturing the same Electric fuse and method of manufacturing the same

1979-07-30

1980-10-14

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337253, H01H 8516

Patent

active

042284171

ABSTRACT:
A sub-assembly for electric fuses comprising a perforated fusible element having a pair of ribbon ends. The ribbon ends are bent around the rims of the casing from the inside to the outside of the casing. In fuses including such a sub-assembly one of the ends may be pre-bent, i.e. bent prior to insertion of the fusible element and its pair of ends into the casing. The other end or non-pre-bent end, must be bent around one of the rims of the tubular casing to the outer surface thereof preparatory to the mounting of the terminal caps, or ferrules, on the casing. This bending operation may involve great difficulties, particularly if the pair of ends have great dimensional stability, and the perforated fusible element portion is relatively frail, and tends to be twisted and/or otherwise deformed when one of the pairs of ends is bent around the rim of the casing to the outer surface thereof.
According to this invention the casing of the fuse is provided with a slot extending axially inwardly from one of its rims and has a sufficient length to allow insertion of the fusible element into said casing with both of its ends pre-bent. The pre-bent ends are angularly displaced relative to the slot in the casing which allowed the fusible element to be inserted into the casing with both ends thereof pre-bent.
Also described herein is a sub-assembly having a pair of longitudinal slots rather than but one.

REFERENCES:
patent: 1810653 (1931-06-01), Hartwig
patent: 2064034 (1936-12-01), Rudnick
patent: 3291943 (1966-12-01), Kozacka

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