Female automotive fuse having fuse clips electrically connected to conductive thermal blocks

• US 5,631,619 A
• Filed: 03/20/1995
• Issued: 05/20/1997
• Est. Priority Date: 03/20/1995
• Status: Expired due to Term

• Current Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Original Assignee: Cooper Industries, Inc. (Eaton Corporation PLC.)
• Inventors: Evans, Terence J.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US08/407,356
• Time in Patent Office: 792 Days
• Field of Search: 337/186, 337/197-198, 337/166, 29/623
• US Class Current: 337/198
• CPC Class Codes: B22D 19/00 Casting in, on, or around objects which form part of the product B22D23/04 takes precedence; alumino-thermic welding B23K23/00; coating by casting molten material on the substrate C23C6/00
• CPC Class Codes: B22F 7/06 of composite workpieces or articles from parts, e.g. to form tipped tools B22F7/002 takes precedence
• CPC Class Codes: H01H 85/0056 Heat conducting or heat absorbing means associated with the fusible member, e.g. for providing time delay
• CPC Class Codes: H01H 85/0417 with parallel side contacts
• CPC Class Codes: H01H 85/055 Fusible members
• CPC Class Codes: H01H 85/06 characterised by the fusible material H01H85/11 takes precedence

Abstract

A female fuse having a one piece fuse link and thermal mass injection molded around a multifinger fuse clips. The fuse link, thermal mass, and fuse clip are enclosed in an insulating housing. The resulting fuse is smaller in size and operates at a cooler temperature than other fuses.

Claims

1. A female fuse comprising:

a fuse link;

a first conductive thermal block and a second conductive thermal block electrically connected to said fuse link;

a first female fuse clip and a second female fuse clip electrically connected respectively to said first and second thermal blocks, wherein said fuse clips are insert molded into said thermal blocks, and wherein said fuse link and said thermal blocks are injection molded as a one piece unit, said fuse clips, thermal blocks, and fuse link comprise a fuse assembly; and

a housing, enclosing said fuse assembly.

2. A fuse as in claim 1 wherein said fuse clip is a multifinger fuse clip.

3. A fuse as in claim 1 wherein said fuse link and said thermal blocks are injection molded from low temperature metals selected from a group comprising tin-silver, tin-lead, and tin-antimony.

4. A fuse as in claim 1 wherein said fuse link and said thermal blocks are injection molded from alloys having a temperature transition lower than 300 degrees C.

5. A fuse as in claim 1 wherein said fuse clip is a conductive metal selected from a group comprising:

copper;

copper alloys, including tin bronze, red brass; and

ceramic bearing copper alloys.

6. A fuse as in claim 1 wherein said fuse assembly is held in said housing by ears formed on said fuse clips during stamping that interlock into grooves formed in said housing.

7. A fuse as in claim 6 wherein said grooves are formed in said body during molding.

8. A female fuse comprising:

a fuse link;

a first conductive thermal block and a second conductive thermal block electrically connected on opposite sides to said fuse link;

a first female fuse clip and a second female fuse clip electrically connected respectively to said first and second thermal blocks, said fuse clips, thermal blocks, and fuse link comprise a fuse assembly; and

a housing enclosing said fuse assembly.

9. A fuse for an electrical circuit comprising:

a fusible element adapted for connection in the circuit;

a conductive member adapted for connection in the circuit;

a conductive thermal block electrically connected between said fusible element and conductive member to serve as a heat sink for said fusible element.

10. The fuse of claim 9 wherein said thermal block has heat sink characteristics which enable the fuse to operate with a time delay.

11. The fuse of claim 9 wherein said thermal block prevents said fusible element from opening during over-current conditions of a short duration in the circuit.

12. The fuse of claim 9 wherein said thermal block is made of a metal with a transition temperature of less than 300 degrees centigrade.

13. The fuse of claim 9 wherein said conductive member has a portion thereof encapsulated in said thermal block.

14. The fuse of claim 9 wherein said fusible element, conductive member and thermal block are housed within an insulating housing.

15. A fuse for an electrical circuit comprising;

a fusible element adapted for connection in the circuit;

a conductive member adapted for connection in the circuit;

a thermal block electrically disposed between said fusible element and conductive member to serve as a heat sink for said fusible element;

wherein said thermal block and fusible element are integral of the same metal and said thermal block includes a mass of metal greater than that of said fusible element.

16. The fuse of claim 15 wherein said metal is a metal alloy and said metal alloy and mass of said thermal block are determined by the rating of the fuse.

17. A fuse comprising:

first and second conductive members;

a fuse link having one end electrically connected to a first conductive thermal block and a second end electrically connected to a second conductive thermal block;

said first and second conductive members electrically connected to said first and second thermal blocks, respectively; and

said first and second thermal blocks serving as heat sinks.

18. The fuse of claim 17 further including an insulating housing around said conductive members, fuse link and thermal blocks.

19. The fuse of claim 18 wherein said housing includes a chamber for receiving said conductive members, fuse link and thermal blocks.

20. The fuse of claim 18 wherein said housing includes portions projecting into said chamber for engaging and retaining said conductive members.