Abstract The end caps of an electric current limiting fuse are telescopingly fitted inside the end portion of a housing tube and sealed to the inside wall in at least two spaced-apart locations to isolate an annular space between the outside cylindrical cap surface and the inside cylindrical housing tube surface. A settable adhesive fills the annular space to tightly bond the cap to the housing and to form a strong hermetic seal. Also disclosed is a method of making the seal described above, including the steps of assembling in telescoping relationship two cylindrical workpieces, providing at least two seals between the pieces to define an annular space between them, injecting a settable adhesive into the annular recess through an injection port in one of the cylinders while bleeding air out through a bleed aperture, and baking to set the adhesive.
An electrical device comprising a cylindrical housing first member a cylindrical second member telescopingly fitted inside said housing member, at least one resilient gasket member between the inner surface of said first member and the outer surface of said second member, said gasket defining one end of an annular space between said first and second members, and a settable adhesive filling said granular space and rigidly bonding together said first and second members to form an annular hermetic seal.
Claim 2
Dependent Claim
79 words
An electrical device comprising a cylindrical housing first member a cylindrical second member telescopingly fitted inside said housing member, at least one resilient gasket member between the inner surface of said first member and the outer surface of said second member, said gasket defining one end of an annular space between said first and second members, and a settable adhesive filling said granular space and rigidly bonding together said first and second members to form an annular hermetic seal.
Claim 3
Dependent Claim
17 words
The invention defined in claim 1 and wherein said first and second members are substantially circular cylinders.
Claim 4
Dependent Claim
50 words
The invention defined in claim 2 and wherein said first member is a circular electrical fuse housing tube and said second member is an end cap telescopingly fitted in one end of said first member and provided with two toroidal resilient gaskets for confining said adhesive to said annular space.
Claim 5
Dependent Claim
22 words
The invention defined in claim 2 and wherein said cap is provided with two annular gasket-receiving grooves and said gaskets are O-rings.
Claim 6
Dependent Claim
38 words
The invention defined in claim 4 and wherein said settable adhesive is a structural epoxy resin which is capable of maintaining its bond strength during thermal cycling of from minus about 40° C to about plus 140° C.
Claim 7
Dependent Claim
68 words
The invention defined in claim 1 and wherein said first member is a circular fuse housing tube and said second member is a circular end cap for said tube, said end cap having a rigid outer shoulder which forms a seal when adjacent the end of said housing tube and having an addition an inner seal formed by a toroidal resilient gasket between said inner and outer members.