Electrical conductors and methods of making same

• US 6,313,409 B1
• Filed: 03/26/1998
• Issued: 11/06/2001
• Est. Priority Date: 05/02/1997
• Status: Expired due to Fees

• Current Assignee: General Science Technology Corporation
• Original Assignee: General Science Technology Corporation
• Inventors: Avellanet, Francisco, Bales, Thomas O. Jr.
• Primary Examiner(s): Nguyen, Chau N.
• Application Number:
  US09/048,746
• Time in Patent Office: 1,321 Days
• Field of Search: 174/126.1, 174/126.2, 174/128.1, 174/128.2, 174/129.R, 174/133.R, 174/125.1
• US Class Current: 174/128.1
• CPC Class Codes: A61M 2025/09075 having a core without a coil possibly combined with a sheath
• CPC Class Codes: A61M 2025/09191 made of twisted wires
• CPC Class Codes: B21C 37/045 Manufacture of wire or bars with particular section or properties
• CPC Class Codes: D07B 2201/2019 pressed to shape
• CPC Class Codes: D07B 2501/406 for making electrically conductive cables
• CPC Class Codes: D07B 7/027 Postforming of ropes or strands
• CPC Class Codes: H01B 13/0292 After-treatment
• CPC Class Codes: H01B 5/10 stranded around a space, insulating material, or dissimilar conducting material
• CPC Class Codes: H01B 7/0009 Details relating to the conductive cores

Abstract

Electrical conductors according to the invention include conductors made from a plurality of strands twisted around a central conductor, where the strands are fused to the central conductor but not to each other. According to a preferred embodiment, the central conductor is coated with a coating of a first material which may be melted to fuse the central conductor to the outer strands. In another preferred embodiment, the outer strands are also coated with a second conductive material which forms a eutectic mixture with the coating on the central conductor when heated to a temperature below the melting points of the first and second conductive materials. Alternate embodiments of the invention provide a eutectic mixture by choice of strand and central conductor material and/or coating. If desired, the conductor is deformed prior to melting the coating(s) such as by drawing or swaging to form a conductor with a substantially circular cross section or by rolling or drawing to form a conductor with a substantially rectangular cross section. In still another embodiment, the conductor is formed as a coil prior to melting the coating(s). The conductors of the invention exhibit enhanced electrical and physical characteristics and are particularly well suited for use in conducting VHF and UHF signals and for making coils.

Claims

1. An electrical conductor, comprising:

a plurality of circular conductive strands twisted around a central conductor to form a bundle, said plurality of circular conductive strands being fused to said central conductor, but not fused to each other,

wherein said central conductor includes a first material and said conductive strands include a second material, and said first and second materials together form a eutectic mixture.

2. An electrical conductor according to claim 1, wherein:

said first material is selected from the group consisting of lead, tin, and silver.

3. An electrical conductor according to claim 1, wherein:

after said conductive strands are fused to said central conductor, said bundle is deformed to form a conductive cable having a substantially non-circular cross section.

4. An electrical conductor according to claim 3, wherein:

said conductive cable having a substantially non-circular cross section is wound into a coil.

5. An electrical conductor according to claim 1, wherein:

said bundle is wound into a coil.

6. An electrical conductor according to claim 1, wherein:

after said fusing, said bundle is drawn through a die or swaged to form a conductive cable having a substantially circular cross-section.

7. An electrical conductor according to claim 6, wherein:

said conductive cable having a substantially circular cross section is wound into a coil.

8. An electrical conductor according to claim 1, wherein:

said second material is a conductive coating on said conductive strands.

9. An electrical conductor according to claim 8, wherein:

said conductive coating include material selected from the group consisting of lead, tin, and silver.

10. An electrical conductor according to claim 1 wherein:

said central conductor is formed from said first material, and

said plurality of conductive strands are coated with said second material.

11. An electrical conductor according to claim 1, wherein:

said second material is a coating on said plurality of conductive strands.

12. An electrical conductor, comprising:

a compacted conductive cable having a substantially circular cross section and having a plurality of conductive strands twisted around a central conductor with each of said plurality of conductive strands being fused to said central conductor, but not fused to each other.

13. An electrical conductor according to claim 12, wherein:

said compacted conductive cable is formed by first taking said conductive strands and twisting said condutive strands around said central conductor to form a bundle, fusing said conductive, strands to said central conductor but not to each other to form a fused bundle, and then either swaing or drawing said fused bundle through a die to compact said conductive cable and provide it with said substantially circular cross section.

14. An electrical conductor according to claim 12, wherein:

wherein said central conductor includes a first material and said conductive strands include a second material, and said first and second materials together form a eutectic mixture.