US 4,063,208 A · Fuse housing end caps secured by magnetic pulse forming

Abstract

End ferrules of a current limiting fuse are mounted to the end of a relatively fragile non-metallic insulator housing of the fuse by magnetic pulse forming. The end ferrules are formed so that there is a flat circular end wall and an annular mounting flange. The flat circular end walls are of a first thickness sufficient to withstand mechanical forces that may be experienced due to fuse operation or due to mounting of the fuse. The annular mounting flange is of a second thickness less than the first thickness so that the flange can be compressed around the housing by magnetic pulse forming without causing undue stress to be exerted on the housing that may result in damage to the housing. A unique elastomer ring seal is provided between the housing and the end ferrule to assure a moisture tight seal. The method disclosed is applicable to allow compressive attachment of a variety of metallic members to a variety of relatively fragile members so that the strength of the metallic member may be maintained, but the metallic member may be compressed without damage to the fragile member.

Claims13

Dependent claims

An electrical fuse comprising:

a cylindrical hollow housing formed of a non-metallic, low compressive stress resistant, electrically insulating material, said housing having opposite open ends and an annular recess formed adjacent each end on the exterior of said housing;
first and second end members each comprising:
a circular end wall having a first thickness sufficient to withstand mechanical stress incident to mounting and operation of said fuse;
an annular flange formed integrally with said circular end wall along the edge thereof and extending approximately perpendicular thereto, said flange having a second thickness less than the first thickness:
said first and second end members positioned over the opposite open ends of said housing, the annular flanges being compressed into the annular recesses formed in said housing by magnetic pulse forming to attach and seal said first and second end members over the open ends of said housing;
said second thickness being thin enough to permit said annular flanges to be compressed by magnetic pulse forming without causing damage to said housing;
a current responsive element connected between said first and second end members.

4 more elements

Dependencies are inferred from the claim text.

Fuse housing end caps secured by magnetic pulse forming

Life of this patent

Fuse housing end caps secured by magnetic pulse forming

Life of this patent

Abstract

Claims13