Sealed fuse

Patent metadata

Field	Value
Publication number	US-10319551-B2
Application number	US-201815867053-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Oct 12, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A sealed fuse in accordance with the present disclosure may include a tubular fuse body, a trench formed in an exterior of the fuse body, and an electrically conductive endcap that fits over an end of the fuse body and is fastened to the fuse body by an electrically conductive material having a lip portion that extends into the trench to provide a barrier that extends between the fuse body and the endcap. In an embodiment, the trench may be formed in an end face of the fuse body and may extend entirely around an opening in the end of the fuse body. In another embodiment, the trench may be formed in an outwardly-facing surface of a sidewall of the fuse body and may extend entirely around the fuse body.

First claim

The invention claimed is:

1. A sealed fuse comprising:
a tubular fuse body having opposing end faces and a sidewall extending between the end faces;
a trench formed in an exterior surface of the sidewall;
a fusible element disposed within the fuse body; and
an electrically conductive endcap that fits over an end of the fuse body and is fastened to the fuse body by an electrically conductive material having a lip portion that extends into the trench to provide a barrier that extends between the fuse body and the endcap, wherein the trench extends entirely around the sidewall and is disposed entirely within the endcap.

2. The sealed fuse of claim 1 , wherein the fuse body is formed of an electrically insulating material.

3. The sealed fuse of claim 1 , wherein the conductive material is a material that can be applied in a fluid, first state and that can subsequently be hardened to second state that is relatively less fluid than the first state.

4. The sealed fuse of claim 1 , wherein the conductive material comprises one of solder and a conductive adhesive.

5. The sealed fuse of claim 1 , wherein the endcap is a first endcap, the trench is a first trench, and the conductive material is a first conductive material, the sealed fuse further comprising an electrically conductive second endcap that fits over an end of the fuse body opposite the first endcap and is fastened to the fuse body by a second conductive material having a lip portion that extends into a second trench in the exterior of the fuse body to provide a barrier extending between the fuse body and the second endcap.

6. The sealed fuse of claim 5 , wherein the fusible element extends through the fuse body and is secured to the first conductive material and to the second conductive material and provides an electrically conductive pathway between the first endcap and the second endcap.

7. A method of manufacturing a sealed fuse, the method comprising:
providing a tubular fuse body having opposing end faces and a sidewall extending between the end faces, a trench formed in an exterior of the sidewall; and
fastening an electrically conductive endcap to an end of the fuse body with an electrically conductive material that forms a lip portion that extends into the trench to provide a barrier that extends between the fuse body and the endcap, wherein the trench extends entirely around the sidewall and is disposed entirely within the endcap.

8. The method of claim 7 , wherein the fuse body is formed of an electrically insulating material.

9. The method of claim 7 , wherein, when the endcap is fastened to the end of the fuse body, the conductive material is in a fluid, first state and flows into the trench as the conductive material is compressed between the endcap and the exterior of the fuse body, and wherein the conductive material subsequently hardens to a second state that is less fluid than the first state.

10. The method of claim 7 , wherein the conductive material comprises one of solder and a conductive adhesive.

11. The method of claim 7 , wherein the endcap is a first endcap, the trench is a first trench, and the conductive material is a first conductive material, the method further comprising fastening an electrically conductive second endcap over an end of the fuse body opposite the first endcap by a second conductive material that forms a lip portion that extends into a second trench in the exterior of the fuse body to provide a barrier extending between the fuse body and the second endcap.

12. The method of claim 11 , further comprising inserting a fusible element into the fuse body and securing the fusible element to the first conductive material and to the second conductive material to provide an electrically conductive pathway between the first endcap and the second endcap.

Assignees

• Littelfuse Inc

Inventors

• Bruan Ped Peterson
• Miranda Grace
• Aberin Edwin

Classifications

• H01H85/003

  casings for the fusible element · CPC title

• H01H85/0013 Primary

  Means for preventing damage, e.g. by ambient influences to the fuse · CPC title

• H01H2223/002

  sealed · CPC title

• H01H69/02

  Manufacture of fuses · CPC title

• H01H85/157

  Ferrule-end contacts · CPC title