Electric fuse having a multiply casing of a synthetic - resin gl

Details Electric fuse having a multiply casing of a synthetic - resin gl Electric fuse having a multiply casing of a synthetic - resin gl

1975-05-22

1976-09-07

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337414, 337415, H01H 8502

Patent

active

039797090

ABSTRACT:
An electric fuse comprises a fusible element, arc-quenching means surrounding said fusible element, a casing of synthetic-resin-glass-cloth laminate housing said fusible element and said arc-quenching means, and a pair of terminal elements arranged at the ends of said casing and conductively interconnected by said fusible element. Said casing includes a plurality of plies, at least an outermost ply and an innermost ply, both formed by woven glass fiber fabric and at least one intermediate ply formed by a glass fiber mat having non-uniformly oriented fibers. The outermost ply and the innermost ply each form an overlap extending substantially in a direction longitudinally of said casing. Both overlaps are angularly displaced. The casing further includes a thermosetting resin integrating said outermost ply, said innermost ply and said intermediate ply into a laminate. The glass fiber density of said laminate is locally increased at the region of said overlap of said outermost ply, and at the region of said overlap of said innermost ply, to such an extent that the wall thickness of said casing is virtually uniform along the entire periphery or perimeter thereof.
Further disclosed are modifications of the above tubular casing structure having a larger number of plies than three.

REFERENCES:
patent: 3723930 (1973-03-01), Koch
patent: 3750075 (1973-07-01), Cooper
patent: 3911385 (1975-10-01), Blewitt et al.

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