Fuse combination, method of making the same, and fuse circuit including the same

• US 5,841,338 A
• Filed: 04/15/1997
• Issued: 11/24/1998
• Est. Priority Date: 04/17/1996
• Status: Expired due to Term

• Current Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Inventors: Yasukuni, Jun
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Vortman, Anatoly
• Application Number:
  US08/843,333
• Time in Patent Office: 588 Days
• Field of Search: 337/293, 337/297, 337/161, 337/181, 337/227, 337/229, 337/230, 337/256, 337/283, 337/197, 337/198, 337/164, 361/833
• US Class Current: 337/293
• CPC Class Codes: H01H 2085/0412 specially adapted for being mounted on a printed circuit board
• CPC Class Codes: H01H 2085/0555 Input terminal connected to a plurality of output terminals, e.g. multielectrode
• CPC Class Codes: H01H 2085/2085 Holders for mounting a fuse on a printed circuit
• CPC Class Codes: H01H 69/02 Manufacture of fuses
• CPC Class Codes: H01H 85/0411 Miniature fuses
• CPC Class Codes: H01H 85/0417 with parallel side contacts

Abstract

A fuse combination in which a group of fused elements are placed on an insulative support. The support is bent into a U-shape carrying the fuse elements with it. Contacts at the ends of the fuse elements extend beyond the corresponding edges of the support and are adapted to be inserted into a socket. To make the combination, the fuse elements are stamped out of a metal plate which has a thin central section. This thin section becomes the fusible portions of the fuse elements. A band at either end of the fuse elements connects them so that they can be handled as a unit. They are then placed on the support, secured thereto, and a preferably transparent cover is placed over the fusible portions.

Claims

1. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support, said support, with said fuse elements secured thereto, being bent into a U-shape.

2. The combination of claim 1 wherein at least parts of said fusible portions extend over each of said cavities.

3. The combination of claim 1 wherein said fusible portions are enclosed in a transparent cover.

4. The fuse combination of claim 1 comprising a first band connecting adjacent said first ends whereby said elements are held in said relationship.

5. The combination of claim 4 wherein said first band is adapted to be severed from said first ends after said fusible elements are affixed to said support.

6. A method of making the fuse combination of claim 1 from said support and a metal plate having a first portion, a second portion, and a third portion therebetween, said method comprising

formation of said fuse elements from said plate, whereby said first portion and said second portion constitute said first contacts and said second contacts, respectively, and said third portion constitutes said fusible portion,

placement of said fuse elements on said support whereby said first contacts and said second contacts engage upstanding complementary units on said support, whereby said fuse elements are secured to said support,

bending said support and said fuse elements into a U-shape about an axis passing through said cavities.

7. The method of claim 6 wherein said fusible portions are thinner than said first contact or said second contact.

8. The method of claim 6 wherein said units are locking projections which have a height greater than a thickness of said first contacts and said second contacts, said method comprising:

after said placement, distorting distal ends of said locking projections so that said distal ends overlie portions of said first contacts and said second contacts and said fuse elements are secured to said support.

9. The method of claim 8 wherein said distal ends are distorted by the application of heat and pressure.

10. The method of claim 6 wherein said units are locking projections having enlarged distal ends, said first contacts and said second contacts having holes corresponding to said projections, said method comprising:

pressing said first contacts and said second contacts onto said support whereby said holes are urged over said enlarged distal ends and said first elements are secured to said support.

11. The method of claim 7 wherein there is a first band connecting adjacent said first ends and a second band connecting adjacent said second ends, said method comprising

severing said first band from said first contacts and said second band from said second contacts after said placement.

12. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

said first contacts and said second contacts being provided with notched adjacent edges, there being complementary units on said support, said units bearing against said notches to secure said fuse elements to said support.

13. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

there being upstanding locking projections with heights greater than thicknesses of said first contacts and said second contacts, said projections overlying portions of said first contacts and said second contacts.

14. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

said first contacts and said second contacts being provided with holes therethrough, there being upstanding locking projections on said support passing through said holes, whereby said fuse elements are secured to said support.

15. The combination of claim 14 wherein said locking projections have enlarged distal ends adapted to retain said projections in said holes.

16. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

said cavities being openings through said support.

17. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

said support having a hinge transverse to said fusible portions, whereby said support, with said fuse elements secured thereto, is bent at said hinge into a U-shape.

18. A fuse combination comprising a plurality of fuse elements arranged in a plane and an insulative support therefor, said fuse elements comprising first contacts at first ends of said fuse elements and second contacts at second ends of said fuse elements, and fusible portions between said first contacts and said second contacts, said first contacts having first depths, said second contacts having second depths, and said fusible portions having third depths, said third depths being thinner than said first depths or said second depths, said fuse elements in parallel and spaced apart relationship to each other in said plane,

said support being generally complementary to said plane, having a dimension parallel to said plane and shorter than a distance between said first ends and said second ends, said support being provided with cavities corresponding to said fusible portions, said fuse elements being affixed to said support,

a socket having a plurality of insertion openings in a first surface thereof, said first contacts in said insertion openings and in electrical contact with terminals therein, an insertion wall on said surface and perpendicular thereto, a lower portion of a transparent cover in said insertion wall.

19. The combination of claim 18 wherein said terminals are busbars mounted on a circuit board.

20. The combination of claim 18 comprising busbars in said insertion openings in electrical contact with said first contacts.