US2733288A - H webster - Google Patents

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US2733288A
US2733288A US2733288DA US2733288A US 2733288 A US2733288 A US 2733288A US 2733288D A US2733288D A US 2733288DA US 2733288 A US2733288 A US 2733288A
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layers
ribs
conductor
layer
tubular conductor
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors

Definitions

  • This invention relates to electric cables of the type having conductors formed and arranged so as to be suitable for use for carrying currents at high frequencies.
  • the invention refers particularly to the construction of a tubular conductor for use as part of such a cable, this construction being especially suitable for tubes of large diameters, for instance from half an inch upwards.
  • This tubular conductor is of the kind comprising two superposed co-axial layers, each formed by bending transversely a strip of metal to form an approximately complete cylinder, the meeting places of the edges of the strips being preferably displaced from each other through an angle of from 90 to 180.
  • the inner layer is formed with outwardly projecting transverse ribs and the outer layer with inwardly projecting transverse ribs.
  • the ribs of the two layers are approximately equal in depth radially and fit between each other and the layers and ribs are so dimensioned that the layers are spaced apart by the depth of the ribs.
  • the inner and outer layers in such a construction may be joined together by soldering or cementing at points of contact, that is along the ridges of the ribs.
  • the joining may be etfected at the ribs of one layer only, i. e. the ribs of the inner layer to the inner surface of the outer layer or the ribs of the outer layer to the outer surface of the inner layer, or may be effected at both these places.
  • This joining gives an improved mechanical strength while maintaining sufiicient longitudinal flexibility of the whole structure.
  • the two layers may be bound together by tapes of suitable material. According to the method adopted for securing together the component layers of the tubular conductor and the intended application of the completed cable, it may or may not be necessary to guard against undesirable resonance effects in the tubular conductor by conventional methods.
  • Figure 1 is a side view, partly in elevation and partly in section, of a fragmental length of a coaxial conductor type of high frequency cable having an outer conductor constructed in accordance with the invention, parts having been broken away to show the construction more clearly.
  • Figures 3, 5, 7 and 9 are views corresponding to Figure 1 and showing further examples of outer tube construction in accordance with the invention.
  • Figures 2, 4, 6, 8 and 10 respectively are sections on the lines IIlI, IV--IV, VIVI, VIIIVIII, and XX of Figures 1, 3, 5, 7 and 9, respectively, but drawn to a larger scale.
  • the inner conductor is shown as a single wire of circular cross-section but it may be of other appropriate form.
  • the outer conductor 2 is formed by two superposed co-axial layers 3 and 4, each consisting of a strip of metal bent to form an approximately complete cylinder.
  • the edges 5, 6 of one metal strip lie diametrically opposite those 7, 8 of the other metal strip but an angular displacement of other than 180 may be adopted, for instance, or any angle between 90 and
  • the inner conductor 1 is located centrally within the outer tubular conductor 2 by spacing discs 9 of insulating material positioned at frequent intervals along the length of the conductor.
  • the inner component layer of the outer conductor has outwardly projecting transverse ribs 10 and the outer component layer has inwardly projecting transverse ribs 11.
  • the ribs 10 and 11 are approximately of the same radial depth and fit between each other whereby to space apart the two component layers 3 and 4 by the radial depth of the ribs.
  • the longitudinal spacing of the ribs is the same for both layers, or at least the spacing of the ribs of one layer is a sufficiently close approximation to that of the ribs of the other layer to avoid the ribs of one layer gradually riding on those of the other layer as manufacture of a cable length proceeds. Satisfactory results may be obtained with a spacing for the ribs of both layers of from once to twice the mean diameter of the tubular conductors. Alternatively the spacing of the ribs on one layer may be a multiple of that of the ribs on the other layer.
  • the transversely bent strips 3 and 4 may be arranged with their longitudinal edges 5 and 6, and 7 and 8, parallel with the axis of the conductor, as shown in Figures l, 3 and 5, or they may be nclined slightly so that they run in a helix of long pitch, as shown in Figures 7 and 9.
  • each component layer may be so formed and placed that the two ends of each rib meet or come into line with each other where the edges 5 and 6 (or 7 and 9) approach one another, as shown in Figures 1 and 9, or they may be so formed and placed that, as shown in Figures 3, 5 and 7, this wincidence does not take place.
  • the ribs may run normal to the axis of the conductor, as shown in Figures 1 and 9, or they may be skewed as shown in Figures 3, 5 and 7.
  • the latter arrangement has advantages in that it permits by appropriate skewing of the ribs of one or both layers and appropriate spacing of the ribs of one layer relative to those of the other of obtaining longitudinal interlocking of the two layers 3 and 4.
  • this locking effect may be attained if each rib on one layer forms a part of a helical screw thread and each rib on the other layer forms part of a screw thread of the same pitch and has a width corresponding to the width of the space which would be formed between successive convolutio-ns of the rib on the first layer if that rib had a length in excess of one complete turn, so that over a part of its length the rib on the said other layer may engage one side of the rib on the first layer and over another part of its length it may engage the other side of the same rib, as shown in Figure 5.
  • this two-layer construction of tube with the edges 5 and 6 of the inner layer abutting against each other, as shown for example in Figures 1 and 2, and with a small gap between the edges '7 and 8 of the outer layer so that by tightening down this outer layer, the contact between the edges of the inner layer may be ensured and the internal diameter of the conductor accurately determined by the width of the strip used to form the inner layer.
  • a binder may be applied to hold the two layers in position, for instance, a binder consisting of two tapes 12 greases applied as shown in Figure 1.
  • These tapes 12 may be i of fabric, plastic or copper or, where an electromagnetic screen is required for the conductor, they may be of steel.
  • the inner and outer layers may be soldered together at their points of contact, namely, along the ridges of the ribs of one or both layers, for which purpose the ribs may have been pretinned, or the inner and outer layers may be cemented together along the ridges as with a synthetic rubber adhesive.
  • soldering may be effected by passing the tube through a hot die. The soldering may be facilitated by the application of a flux to the surfaces to be soldered before the outer strip is closed on the inner strip.
  • the adhesive may be applied to the ribs during assembly of the two layers, as by brushing or squirting. Adhesion may be secured by passing the tube through a heated die or between hot rolls.
  • Figures 1 and 2 of the drawings show the longitudinal edges of the inner layer 3 in contact, it will be appreciated that the longitudinal edges of the inner layers 3 of the other examples of construction illustrated may, and preferably will, be brought into abutment and held so either by a binder on the outer layer or by soldering or cementing the outer to the inner layer at their points of contact, or by both means.
  • An electric cable for the transmission of high frequency currents comprising a tubular conductor comprising two superposed and mutually radially spaced coaxial layers each comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers, a plurality of insulating members located within said tubular conductor at intervals along the length of said tubular conductor and at least one conductor located within said tubular conductor and insulated therefrom by said insulating members.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers each comprising a transversely bent strip of metal forming an approximately complete cylinder, the inner of said layers having outwardly projecting transverse ribs and the outer of said layers having inwardly projecting transverse ribs, the ribs of both inner and outer of said layers being approximately equal in depth radially and fitting between each other, said layers and said ribs being so dimensioned that said layers are spaced apart by the depth of said ribs.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of the said other layer, the longitudinal spacing of said ribs being at least approximately the same for both layers.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer, the longitudinal edges of the strips lying parallel with the axis of said tubular conductor.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced V co-axial layer s, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer, the longitudinal edges of the strips running in a helix of long pitch.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial component layers, each of said layers comprising strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of the said other layer, the transverse ribs of at least one of said layers being skewed and the ribs of one of said layers being so positioned with respect to those of the other of said layers as to lock the two layers longitudinally.
  • a tubular conductor for a high frequency cable comprising two superposed co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having plain cylindrical portions separated by transverse ribs each projecting towards and extending to the adjacent plain cylindrical portion of the surface of the other of said layers and located between the ribs of said other layer, each rib on one of said layers forming a part of a helical screw thread and each rib on the other of said layers forming part of a screw thread of the same pitch as that of the first said screw thread and over a part of its length in engagement with one side of a rib on the first layer and over another part of its length in engagement with the other side of that rib.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having plain cylindrical portions separated by transverse ribs each projecting towards and extending to the adjacent plain cylindrical portion of the surface of the other of said layers and located between the ribs thereof, the edges of the inner of said layers abutting against one another and the edges of the outer of said layers being separated by a small gap, and, means for tightening down the outer of said layers on to the inner of said layers and holding the edges of said inner layer in contact with one another, whereby the internal diameter of said conductor is controlled by the width of said strip of which the inner of said layers is comprised.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip .of metal bent transversely to form an approximately complete cylinder having plain cylindrical portions separated by transverse ribs each projecting towards and extending to the adjacent plain cylindrical portions of the surface of the other of said layers and located between the ribs thereof, the edges of the inner of said layers abutting against one another and the edges of the outer of said layers being separated by a small gap, and a binder at least one tape extending helically around the outer of said layers and tightening down said outer layer on to the inner of said layers and holding the edges of said inner layer in contact with one another, whereby the internal diameter of said conductor is controlled by the width of said strip of which the inner of said layers is comprised.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to theadjacent surface of the other of said layers and located between the ribs of saidother layer, and means for holding the two layers in position comprising soldered joints between the ridges of the ribs of at least one of said layers and the adjoining surface of the other of said layers.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer, and means for holding the two layers in position comprising cemented joints between the ridges of the ribs of at least one of said layers and the adjoining surface of the other of said layers.
  • a tubular conductor for a high frequency cable comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer, and means uniting the ridges of the ribs of at least one of the layers to the adjoining .surface of the other of said layers, whereby to hold the two layers in position relative to one another.
  • An electric cable for the transmission of high frequency electric currents comprising a tubular conductor, at least one inner conductor within said tubular conductor and insulating means within said tubular conductor locating said inner conductor relative to said tubular conductor and insulating it therefrom, said tubular conductor comprising two superposed and mutually radially spaced co-axial layers, each comprising a transversely bent strip of metal forming an approximately complete cylinder, the inner of said layers having outwardly projecting transverse ribs and the outer of said layers having inwardly projecting transverse ribs, the ribs of both inner and outer of said layers being approximately equal in depth radially and fitting between each other, said layers and said ribs being so dimensioned that said layers are spaced apart by the depth of said ribs.
  • An electric cable for the transmission of high frequency electric currents comprising a tubular conductor, at least one inner conductor within said tubular conductor and insulating means within said tubular conductor locating said inner conductor relative to said tubular conductor and insulating it therefrom, said tubular conductor comprising two superposed co-axial component layers each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having plain cylindrical portions separated by transverse ribs each projecting towards and extending to the adjacent plain cylindrical portion of the surface of the other of said layers and located between the ribs of the said other layer, the transverse ribs of at least one of said layers being skewed and the ribs of one of said layers being so positioned with respect to those of the other of said layers as to lock the two layers longitudinally.
  • An electric cable for the transmission of high frequency electric currents comprising a tubular conductor, at least one inner conductor within said tubular conductor and insulating means within said tubular conductor locating said inner conductor relative to said tubular conductor and insulating it therefrom, said tubular conductor comprising two superposed co-axial component layers each of said layers comprising a strip of metal bent transversely to form an aproximately complete cylinder having plain cylindrical portions separated by transverse ribs each projecting towards and extending to the adjacent plain cylindrical portion of the surface of the other of said layers and located between the ribs of the said other layer, each rib on one of said layers forming a part of a helical screw thread and each rib on the other of said layers forming part of a screw thread of the sme hand and of the same pitch as that of the first said screw thread and over a part of its length being in engagement with one side of a rib on the first layer and over another part of its length in engagement with the other side of that rib.
  • An electric cable for the transmission of high fre quency electric currents comprising a tubular conductor, at least one inner conductor within the tubular conductor and insulating means within said tubular conductor locating said inner conductor relative to said tubular conductor and insulating it therefrom, said tubular conductor comprising two superposed co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs thereof, the edges of the inner of said layers abutting against one another and the edges of the outer of said layers being separated by a small gap, and means for tightening down the outer of said layers on to the inner of said layers whereby to ensure contact between the edges of said inner layer and that the internal diameter of said conductor is controlled by the width of said strip of which the inner of said layers is comprised.
  • An electric cable for the transmission of high frequency electric currents comprising a tubular conductor, at least one inner conductor within a tubular conductor and insulating means within said tubular conductor locating said inner conductor relative to said tubular conductor and insulating it therefrom, said tubular conductor comprising two superposed co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs thereof, the edges of the inner of said layers abutting against one another and the edges of the outer of said layer being separated by a small gap, and a binder comprising at least one tape extending helically around the outer of said layers and tightening down said outer layer on to the inner of said layers, whereby to ensure contact between the edges of said inner layer and that the internal diameter of said conductor is controlled by the width of said strip of which the inner of said layers is comprised.
  • An electric cable for the transmission of high frequency currents comprising a tubular conductor, an inner conductor within said tubular conductor and insulating means for supporting said inner conductor and maintaining it in spaced relationship to said tubular conductor, said tubular conductor comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer and means for holding the two layers in position comprising soldered joints between the ridges of the ribs of at least one of said layers and the adjoining surface of the other of said layers.
  • An electric cable for the transmission of high frequency currents comprising a tubular conductor, an inner conductor within said tubular conductor and insulating means for supporting said inner conductor and maintaining it in spaced relationship to said tubular conductor, said tubular conductor comprising two superposed and mutually radially spaced co-axial layers, each of said layers comprising a strip of metal bent transversely to form an approximately complete cylinder having transverse ribs projecting towards and extending to the adjacent surface of the other of said layers and located between the ribs of said other layer and means uniting the ridges of the ribs of at least one of the layers of the Reieences Cited in the file of this patent UNITED STATES PATENTS 1,057,098 Smith Mar, 25, 1913 1,514,292 Knoderer Nov. 4, 1924 2,245,766 Dorfelet a1. June 17, 1941 2,469,565 Logan May 10,1949 2,546,309 Kempf Mar. 27, 1951 2,589,700 Johnstone Mar. 18,1952

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US2733288D 1950-02-08 H webster Expired - Lifetime US2733288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB287369X 1950-02-08

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US2733288A true US2733288A (en) 1956-01-31

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US (1) US2733288A (en, 2012)
BE (1) BE500929A (en, 2012)
CH (1) CH287369A (en, 2012)
DE (1) DE876855C (en, 2012)
FR (1) FR1031419A (en, 2012)
GB (1) GB672541A (en, 2012)
NL (1) NL77501C (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717718A (en) * 1970-12-01 1973-02-20 Kabel Metallwerke Ghh High pressure cable
US6207900B1 (en) * 1997-06-21 2001-03-27 Alcatel Hybrid cable with central line and supplementary conductors

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191024122A (en) * 1910-10-18 1911-03-23 Western Electric Co Ltd Improvements in Protective Covering for Flexible Electric Conductors.
US1057098A (en) * 1912-06-11 1913-03-25 Smith Metal Perforating Company Sheet-metal casing for drainage culverts, conduits, screens, &c.
US1514292A (en) * 1924-11-04 Homer g
US2245766A (en) * 1936-09-26 1941-06-17 Siemens Ag Self-supporting hollow conductor for electric cables
US2469565A (en) * 1943-11-23 1949-05-10 Western Electric Co Apparatus for forming metal tape into tubular conductors
US2546309A (en) * 1948-03-26 1951-03-27 Bell Telephone Labor Inc Joint for coaxial conductors
US2589700A (en) * 1949-07-16 1952-03-18 Western Electric Co Electric cable sheathing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1514292A (en) * 1924-11-04 Homer g
GB191024122A (en) * 1910-10-18 1911-03-23 Western Electric Co Ltd Improvements in Protective Covering for Flexible Electric Conductors.
US1057098A (en) * 1912-06-11 1913-03-25 Smith Metal Perforating Company Sheet-metal casing for drainage culverts, conduits, screens, &c.
US2245766A (en) * 1936-09-26 1941-06-17 Siemens Ag Self-supporting hollow conductor for electric cables
US2469565A (en) * 1943-11-23 1949-05-10 Western Electric Co Apparatus for forming metal tape into tubular conductors
US2546309A (en) * 1948-03-26 1951-03-27 Bell Telephone Labor Inc Joint for coaxial conductors
US2589700A (en) * 1949-07-16 1952-03-18 Western Electric Co Electric cable sheathing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717718A (en) * 1970-12-01 1973-02-20 Kabel Metallwerke Ghh High pressure cable
US6207900B1 (en) * 1997-06-21 2001-03-27 Alcatel Hybrid cable with central line and supplementary conductors

Also Published As

Publication number Publication date
FR1031419A (fr) 1953-06-23
CH287369A (de) 1952-11-30
GB672541A (en) 1952-05-21
DE876855C (de) 1953-05-18
NL77501C (en, 2012)
BE500929A (en, 2012)

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