Single bolt fuse assembly with an electrically isolated bolt

Patent metadata

Field	Value
Publication number	US-11469070-B2
Application number	US-202117506063-A
Country	US
Kind code	B2
Filing date	Oct 20, 2021
Priority date	Feb 11, 2021
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A single bolt fuse assembly and method to connect a single bolt fuse to a circuit or device are disclosed. The single bolt fuse assembly enables the single bolt fuse to be used on any electrical device having a hole suitable for receiving a threaded shaft and connectable to a circuit or device that electrically connects to a female battery or power cable. The apparatus includes a separate high-conductive metal terminal that mates with the stud that mechanically attaches the fuse between the electrical devices. The stud is insulated to avoid becoming part of the electrical circuit and to ensure proper operation of the fuse. By mechanically attaching the stud to the metal terminal, the stud is unlikely to get separated from the fuse.

First claim

The invention claimed is:

1. A fuse assembly, comprising:
an insulated steel bolt comprising:
a shaft comprising a threaded portion; and
a base coupled to the shaft, wherein the shaft extends from one side of the base;

a metal terminal comprising:
a bolt base receptacle comprising a hollow interior, wherein the base fits into the hollow interior of the bolt base receptacle; and
a threaded shaft extending from one side of the bolt base receptacle.

2. The fuse assembly of claim 1 , wherein the shaft of the insulated steel bolt extends through a cylindrical opening of a fuse.

3. The fuse assembly of claim 1 , the shaft further comprising an insulated portion.

4. The fuse assembly of claim 1 , wherein the base is a rectangular cube of a first dimension.

5. The fuse assembly of claim 4 , wherein the hollow interior of the bolt base receptacle defines a volume having a shape of a second rectangular cube of a second dimension.

6. The fuse assembly of claim 5 , wherein the second dimension is greater than the first dimension.

7. The fuse assembly of claim 1 , the bolt base receptacle further comprising an opening to receive the base into the hollow interior.

8. The fuse assembly of claim 7 , wherein the opening is on a surface of the bolt base receptacle adjacent the threaded shaft.

9. The fuse assembly of claim 1 , the bolt base receptacle further comprising an inset portion to receive the shaft of the insulated steel bolt when the base is received into the hollow interior.

10. The fuse assembly of claim 1 , the insulated steel bolt further comprising an insulated washer, wherein the insulated washer is disposed at a base portion of the shaft and is seated on the base.

11. The fuse assembly of claim 1 , wherein the base is insulated with an electrically insulating overmolding material.

12. The fuse assembly of claim 1 , wherein the bolt base receptacle and the threaded shaft of the metal terminal are machined from a unitary, electrically conductive material.

13. The fuse assembly of claim 1 , further comprising a nut and a washer, wherein the washer is secured on the shaft of the insulated steel bolt.

14. The fuse assembly of claim 13 , wherein the shaft is of sufficient length to extend through a ring terminal of a female cable before the nut is secured on the shaft.

15. A fuse assembly, comprising:
an electrically conductive landing pad comprising a threaded shaft and a hollow receptacle, wherein the threaded shaft extends into a receiving aperture of an electrical device;
a stud comprising an insulated base portion, an insulated washer, and a shaft portion, wherein the insulated base portion extends into the hollow receptacle;
wherein current passes from the electrical device, through the single bolt fuse, and to a second electrical device without passing through the stud.

16. The fuse assembly of claim 15 , wherein the shaft portion fits through a cylindrical opening of a single bolt fuse.

17. The fuse assembly of claim 15 , the shaft portion further comprising a threaded portion, an unthreaded portion, and an insulated portion.

18. The fuse assembly of claim 15 , wherein the second electrical device is coupled to the single bolt fuse by a female cable.

19. The fuse assembly of claim 18 , wherein the shaft portion extends through a ring terminal of the female cable.

20. The fuse assembly of claim 19 , wherein current passes through the female cable to the second electrical device without passing through the stud.

Assignees

• Littelfuse Inc

Inventors

• Bianchin Tiziano
• Tinto Massimiliano
• Jozwiak Andrew J
• Schwartz Geoffrey

Classifications

• H01H85/54 Primary

  Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers · CPC title

• H01H85/20

  Bases for supporting the fuse; Separate parts thereof · CPC title

• H01H2223/024

  Screw · CPC title

• H01H85/205

  Electric connections to contacts on the base · CPC title

• H01H85/2045 Primary

  Mounting means or insulating parts of the base, e.g. covers, casings · CPC title