HEATING CABLE WITH COLD OUTLETS

• US 3,657,520 A
• Filed: 08/20/1970
• Issued: 04/18/1972
• Est. Priority Date: 08/20/1970
• Status: Expired due to Term

• Current Assignee: Michel A. (Vernon Ragault
• Original Assignee: Michel A. (Vernon Ragault
• Inventors: Ragault, Michel A. (Vernon
• Primary Examiner(s): Mayewsky, Volodymyr Y.
• Application Number:
  US05/065,398
• Time in Patent Office: 607 Days
• Field of Search: 219/549,552-553,528 338/66,214
• US Class Current: 219/553
• CPC Class Codes: H05B 3/56 Heating cables

Abstract

A heating cable with cold outlets, intended mainly for use as immersion heaters and like heating elements, having heating resistance wire of relatively great length having its end brazed to non-heating conductors of greater diameter, the heating wire being covered with a glass fiber braid having a thickness such that the element has a constant cross-sectional dimension, this element being subsequently slipped into a sheath of plastic insulating material, and that said elements are assembled end to end in order to produce a cable of indefinite length subsequently covered with a metal braid and eventually, by extrusion, with a sheath of insulating plastic material.

Claims

1. Heating cable with cold outlets, intended mainly for use as electric immersion heaters and like heating elements, comprising alternately a succession of heating resistance wires of relatively great length and of non-heating conductive wires of greater cross-sectional dimension than said resistance wires, the ends of the heating wires being soldered to the ends of the conductive wires, a glass fiber braid formed on and around each of said heating wires and having a thickness such that the crosssectional dimension of the heating wires with said glass fiber braids is the same as that of said conductive wires, an insulating sheath and a metal braid of uniform diameter surrounding the assembly of the heating wires and conductive wires and a sheath of insulating plastic material extruded over the assembly.

2. Heating cable as set forth in claim 1, wherein said heating resistance wires consist of stainless-steel resistor having a diameter of 0.8 mm, and said conductive wires consist of copper wire having a diameter of 1.6 mm.

3. Heating cable as set forth in claim 1, wherein the plastic sheath covering the assembly of heating wires and conductive wires consists of polytetrafluoroethylene.

4. Heating cable as set forth in claim 1, wherein said metal braid is made from 0.1 mm copper wire.

5. A section of heating cable for an electric immersion heater as set forth in claim 1, wherein each of said heating resistance wires is 15.5 meters long and two adjoining said conductive wires consist of copper wire having a length of 0.85 meter on one siDe and 1.65 meters on the other side of said resistance wire.

6. Heating cable as set forth in claim 1, wherein the assembly comprising said braid covered resistance wire and said conductive wires have braided thereon another layer of fiber glass surrounded by said insulating sheath and metal braid.

7. Cable as set forth in claim 6, wherein said glass fiber braid covering the heating and cold conductors is coated in the hot state with a fluidized powder of plastic material of the polytetrafluorethylene type bonded thereon by the application of heat, said layer being subsequently covered with said metal braid and with said insulating external sheath.