SHIELDED CABLE HAVING AUXILIARY SIGNAL CONDUCTORS FORMED INTEGRAL WITH SHIELD

• US 3,594,491 A
• Filed: 06/26/1969
• Issued: 07/20/1971
• Est. Priority Date: 06/26/1969
• Status: Expired due to Term

• Current Assignee: Donald F. Zeidlhack
• Original Assignee: Donald F. Zeidlhack
• Inventors: Zeidlhack, Donald F.
• Application Number:
  US04/836,693
• Time in Patent Office: 754 Days
• US Class Current: 174/36
• CPC Class Codes: H01B 11/1808 Construction of the conductors

Abstract

A shielded flexible coaxial cable is described in which auxiliary outer signal conductors are formed integral with the shield surrounding the inner conductor. The shield is formed by a plurality of uninsulated shield wires wrapped about a dielectric core so that they are in electrical contact. The shield wires may be woven together to form a braided shield, or wound in a spiral to form a spiral-wrapped shield. The auxiliary outer conductors are in the form of insulated wires wrapped together with the shield wires simultaneously with the forming of the shield so that the resulting cable is not increased in diameter. A metal foil layer may also be provided beneath the wires to increase the shielding attenuation.

Claims

1. Electrical conductor apparatus comprising:

flexible shielded cable including an inner signal conductor capable of transmitting a first electrical signal, dielectric material surrounding said inner signal conductor, and an electrical shield surrounding the inner signal conductor and separated therefrom by said dielectric material;

said shield being flexible and including a plurality of shield conductors which are wrapped about the dielectric material and in electrical contact with each other; and

at least on auxiliary signal conductor wrapped with the shield conductors around the inner signal conductors and provided as part of the shield but being electrically insulated from said shield conductors by a layer of insulator material to enable said auxiliary signal conductor to transmit a second electrical signal along the cable.

2. A conductor apparatus in accordance with claim 1 in which the shield conductors are bare wire strands supported on said dielectric material and the auxiliary signal conductor is an insulated wire having the insulation material coated thereon.

3. A conductor apparatus in accordance with claim 2 in which the wire strands and insulated wire are woven together to form a braided shield member.

4. A conductor apparatus in accordance with claim 2 in which the wire strands and insulated wire are wrapped together in a spiral to form the shield member.

5. A conductor apparatus in accordance with claim 1 in which the flexible cable means is a coaxial cable and the auxiliary signal conductor is spaced the same distance from the inner conductor as the shield conductors.

6. A conductor apparatus in accordance with claim 1 in which the shield has a substantially uniform diameter throughout its length.

7. A conductor apparatus in accordance with claim 2 which includes a plurality of insulated wires providing a plurality of auxiliary signal conductors.

8. A conductor apparatus in accordance with claim 2 in which the insulating coating is made of an abrasion resistant plastic material.

9. A conductor apparatus in accordance with claim 8 in which the plastic is polyvinyl formal polyamide.

10. A conductor apparatus in accordance with claim 1 in which the shield also includes a metal foil layer between the dielectric material and the shield conductors and the auxiliary signal conductor. 11 A coaxial cable comprising:

a center conductor means for carrying a primary signal;

insulation layer means surrounding said center conductor means; and

electrical shield means surrounding said insulation layer means, said electrical shield means including bare electrical conductor means in electrical engagement with each other and extending around said insulation layer means and insulated electrical conductor means as part of said electrical shield means, said insulated electrical conductor means being insulated from said bare electrical conductor means to enable it to carry a secondary signal there along and said electrical conductor means having substantially the same diameter so that said electrical shield means has a substantially uniform diameter along said cable.