US1999354A - Cable sheath - Google Patents

Cable sheath Download PDF

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Publication number
US1999354A
US1999354A US640172A US64017232A US1999354A US 1999354 A US1999354 A US 1999354A US 640172 A US640172 A US 640172A US 64017232 A US64017232 A US 64017232A US 1999354 A US1999354 A US 1999354A
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United States
Prior art keywords
sheath
cable
seam
conductor
wall thickness
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US640172A
Inventor
Branthwaite Isaac
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okonite Callender Cable Co Inc
Original Assignee
Okonite Callender Cable Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Okonite Callender Cable Co Inc filed Critical Okonite Callender Cable Co Inc
Priority to US640172A priority Critical patent/US1999354A/en
Application granted granted Critical
Publication of US1999354A publication Critical patent/US1999354A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/20Metal tubes, e.g. lead sheaths
    • H01B7/201Extruded metal tubes

Definitions

  • This invention is directed to an improvement in sheaths for electric power cables and embodies a construction in which the metal sheath vof the cable is strengthened at the seam or weld in the 5 process of extruding the lead or other metal sheath about the cable.
  • the present invention is directed to a construction in which the seam or Weld is very much strengthened and the chances of such an occurrence reduced to a minimum.
  • the accompanying drawing which is more or less diagrammatic shows a three conductor cable in sectional elevation, A designating the conductors of the cable, B the insulation, C the filler and D the sheath.
  • the sheath D is usually of lead or of a lead alloy and may be applied to the conductors in a lead press.
  • the seam formed in the extruding operation is designated E. Under present practice care is exercised to make the wall of the sheath D of uniform thickness inzluding that portion of the wall at the seam or weld E.
  • I propose materially to increase the wall thickness of the sheath D at the seam or weld E as compared with the wall thickness of the rest of the sheath, as I have indicated at F, thereby providing a sheath of increased strength at the seam.
  • sheat as employedin this description is to be interpreted to mean a sheath applied closely about the insulation of the conductor or conductors as well as a sheath the inside diameter of which is appreciably larger than the outside diameter of the conductor or conductors so as to provide a reservoir forthe reception of oil under pressure surrounding the insulation of the conductor or conductors.
  • a tubular sheath for oil lled electric cables the sheath 10 being composed of extruded soft metal and having a continuous longitudinal seam, the wall thickness of the sheath at the said seam being materially increased during the extruding operation as compared with the wall thickness of the remainder of the sheath, thereby to increase the resistance of ,the sheath to bursting at the seam due t0 pressure built up in the cable when under load.
  • An electric power cable comprising in combination a conductor, oil impregnated insulation for the conductor and a soft metal sheath having a continuous longitudinal seam 'extruded about the insulation of the conductor, the wall thickness of the sheath at the seam being materially greater than the wall thickness of the remainder of the sheath to increase the resistance of the sheath to bursting at the seam due to pressures built up in the cable when under load'.

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  • Insulated Conductors (AREA)

Description

April 30, 1935. l. BRANTHwAlTE CABLE SHEATH Filed oct. 29, 19:52
3 IN VEN TOR.
. A TTORNE YS.
Patented Apr. 30, 1935 UNITED STATES CABLE SHEATH Isaac Branthwaite, Passaic, N. J., assigner to The Okonite-Callender Cable Company, Incorporated, Paterson, N. J., a corporation of New Jersey Application October 29, 1932, Serial No. 640,172
3 Claims.` (Cl. 173-266) This invention is directed to an improvement in sheaths for electric power cables and embodies a construction in which the metal sheath vof the cable is strengthened at the seam or weld in the 5 process of extruding the lead or other metal sheath about the cable.
In the operation of electric power cables considerable pressure is built up within the sheath of the cable due to the heat generated when the cable is under load, and it has been found in practice that the sheath frequently bursts at the seam. As above noted the present invention is directed to a construction in which the seam or Weld is very much strengthened and the chances of such an occurrence reduced to a minimum.
' The accompanying drawing which is more or less diagrammatic shows a three conductor cable in sectional elevation, A designating the conductors of the cable, B the insulation, C the filler and D the sheath.. The sheath D is usually of lead or of a lead alloy and may be applied to the conductors in a lead press. The seam formed in the extruding operation is designated E. Under present practice care is exercised to make the wall of the sheath D of uniform thickness inzluding that portion of the wall at the seam or weld E. By the present invention, however, I propose materially to increase the wall thickness of the sheath D at the seam or weld E as compared with the wall thickness of the rest of the sheath, as I have indicated at F, thereby providing a sheath of increased strength at the seam.
It is to'be understood that the type of cable shown in the drawing is merely illustrative of my invention, the invention being applicable to single conductor cables as Well as multi-conductor and to oil filled cables and rubber insulated cables.
It is to be understood, furthermore, that the expression sheat as employedin this description is to be interpreted to mean a sheath applied closely about the insulation of the conductor or conductors as well as a sheath the inside diameter of which is appreciably larger than the outside diameter of the conductor or conductors so as to provide a reservoir forthe reception of oil under pressure surrounding the insulation of the conductor or conductors.
What I claim isz- 1. As an article of manufacture a tubular sheath for oil lled electric cables, the sheath 10 being composed of extruded soft metal and having a continuous longitudinal seam, the wall thickness of the sheath at the said seam being materially increased during the extruding operation as compared with the wall thickness of the remainder of the sheath, thereby to increase the resistance of ,the sheath to bursting at the seam due t0 pressure built up in the cable when under load.
2. An electric power cable comprising in combination a conductor, oil impregnated insulation for the conductor and a soft metal sheath having a continuous longitudinal seam 'extruded about the insulation of the conductor, the wall thickness of the sheath at the seam being materially greater than the wall thickness of the remainder of the sheath to increase the resistance of the sheath to bursting at the seam due to pressures built up in the cable when under load'.
3. The process which comprises extruding soft metal in a molten condition about a, cable conductor and insulation assembly to form a tubular casing about the assembly having a continuous longitudinal seam, controlling the metal ,flow during the extruding operation so that the wall thickness of the tubular casing at the seam will be materially greater than the wall thickness of the remainder of the casing to increase the resistance of the sheath to bursting at the seam due to pressure built up in the cable when under load.
ISAAC BRANTHWArI'E. 40
US640172A 1932-10-29 1932-10-29 Cable sheath Expired - Lifetime US1999354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US640172A US1999354A (en) 1932-10-29 1932-10-29 Cable sheath

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Application Number Priority Date Filing Date Title
US640172A US1999354A (en) 1932-10-29 1932-10-29 Cable sheath

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US1999354A true US1999354A (en) 1935-04-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200211733A1 (en) * 2017-06-09 2020-07-02 Prysmian S.P.A. Power cables for electric submersible pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200211733A1 (en) * 2017-06-09 2020-07-02 Prysmian S.P.A. Power cables for electric submersible pump
US11170910B2 (en) * 2017-06-09 2021-11-09 Prysmian S.P.A. Power cables for electric submersible pump

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