US2791624A - Transmission cable for high frequencies - Google Patents
Transmission cable for high frequencies Download PDFInfo
- Publication number
- US2791624A US2791624A US378807A US37880753A US2791624A US 2791624 A US2791624 A US 2791624A US 378807 A US378807 A US 378807A US 37880753 A US37880753 A US 37880753A US 2791624 A US2791624 A US 2791624A
- Authority
- US
- United States
- Prior art keywords
- tube
- cable
- conductors
- transmission cable
- high frequencies
- Prior art date
- 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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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/04—Lines formed as Lecher wire pairs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/156—Coating two or more articles simultaneously
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
- H01B7/0807—Twin conductor or cable
Definitions
- This invention relates to transmission cables especially useful for conducting high frequency currents such as used in television systems, etc.
- wires have been embedded in the opposite sides of a tube made of dielectric material, and wires have been maintained in spaced relationship by a series of spaced separators.
- a transmission cable of simple and economical construction which provides for air or similar desirable fluid as a dielectric separator. Air has a zero power factor, is low dielectric constant, is readily available and the said di* electric constant is invariable.
- a cable comprising two conductors fixed in an insulating tube and separated from each other by air spaces of fixed width and a process of making such product.
- a very convenient way to surround the conductors by the tube is to extrude a tube while continuously introducing the conductors into an opening in the nozzle used to extrude the tube.
- the tubes may be made of any desired thermoplastic material. lf desired, however, the tube may be formed first and the conductors introduced and sealed therein afterwards.
- Fig. 1 is a plan view of the cable of the invention.
- Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1.
- Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 2 but on an enlarged scale.
- Fig. 4 is la cross-sectional view taken on line 4 4 of Fig. 1.
- Fig. 5 is a cross-sectional view similar to Fig. 2 but taken on line 5-5 of the enlarged Fig. 3.
- Fig. 6 is a cross-sectional View taken on line 6-6 of Fig. 3.
- Fig. 7 is a diagrammatic view illustrating a method of making the product.
- the finished product shown in Figs. 1-6 comprises the conductors 11 and 12 within the flattened tube 26. Transverse portions of the tube 20 are sealed together at spaced regions 21, 22, 23, 24, etc. along the length thereof. These spaced portions are rather short linearly with respect to the length of the cable but extend substantially from one conductor 11 to the other conductor 12 transversely of said cable as shown in Fig. 3.
- FIG. 7 A convenient way to I ⁇ make the cable of the invention is illustrated in Fig. 7.
- a tube is continuously extruded through nozzle 39 having an annular réelle 31 and an opening 32 inside of the orifice area through which wires to be covered can be introduced.
- Thermoplastic tube forming material is introduced under pressure through conduit 33.
- the extruded tube 20 is drawn off and is passed between heated rollers 40, 41, each of which contain matching projections 43, 44 thereon.
- As the tube 26 passes between rollers 49, 41 portions of the tube 2t) along the length thereof are pressed together by heated projections 43, 44 and sealed or fused together to produce the device of Fig. 1.
- the cable of the invention is very easy to make, requires less material than Where wires are completely embedded in dielectric material, provides a cable which has air as a dielectric and is very economic and effective. lf desired other iluids or gases besides air may be sealed into the cable.
- l. ln a cable for the transmission of high frequency currents, a pair of conducting elements, and a flattened continuous tubular body of dielectric material surrounding said conducting elements, a first of said conducting elements extending along one side of said flattened tubular body, a second of said conducting elements extending along the opposite side of said flattened tubular body, said flattened tubular body having the opposite portions thereof united at spaced intervals to hold said body in flattened shape and to hold the said conductors in position at the side of said flattened tube and to provide spaced air bubbles within the tubular body extending between the conductors.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Communication Cables (AREA)
Description
May 7, 1957 E. s. KIGLER 2,791,624
TRANSMISSION CABLE FOR HIGH FREQUENCIES Filed sept. 8, 1953 "x n "n n r raf/V619 United States Patent O TRANSMISSION CABLE FOR HIGH FREQUENCIES Edward S. Kigler, Haverstraw, N. Y., assignor to Chester Cable Corp., Chester, N. Y., a corporation of New York Application September 8, 1953, Serial No. 378,807
2 Claims. (Cl. 174-113) This invention relates to transmission cables especially useful for conducting high frequency currents such as used in television systems, etc.
It has already been proposed to make use of air as a dielectric material in transmission cables. For example, wires have been embedded in the opposite sides of a tube made of dielectric material, and wires have been maintained in spaced relationship by a series of spaced separators.
Among the objects of this invention is to provide a transmission cable of simple and economical construction which provides for air or similar desirable fluid as a dielectric separator. Air has a zero power factor, is low dielectric constant, is readily available and the said di* electric constant is invariable.
Among other objects of the invention is to provide a cable comprising two conductors fixed in an insulating tube and separated from each other by air spaces of fixed width and a process of making such product.
These objects and others ancillary thereto are obtained by providing a pair of conductor elements, surrounding the conductors with a tube of dielectric plastic material and thereafter pinching 'and sealing the tube together at spaced points along the length thereof so as to hold the tube in flat position at said spaced points with the conductors fixed in the tube one at each side thereof.
A very convenient way to surround the conductors by the tube is to extrude a tube while continuously introducing the conductors into an opening in the nozzle used to extrude the tube. The tubes may be made of any desired thermoplastic material. lf desired, however, the tube may be formed first and the conductors introduced and sealed therein afterwards. Examples of snitable thermoplastic materials include the polyvinyl resins such as polyvinyl alcohol, polyvinyl acetate, polyvinyl chloride, acrylonitrile, polyvinyl carbozole and copolymers of such materials; polyethylene; polystyrene; cellulose esters =and ethers such as cellulose acetate, cellulose acetate butyrate, ethyl cellulose, etc.; the nylon type of polymeric materials, etc. Since the surrounding means is iirst formed 'as a tube the portions thereof between the united regions tend to expand outwardly to provide an air space between the two conductors held at either side of the cable.
The invention both as to its organization and its method of operation together with additional objects and advantages thereof will be best understood from the following descriptions of specific embodiments thereof when read in connection with the accompanying drawing in which:
Fig. 1 is a plan view of the cable of the invention.
Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1.
Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 2 but on an enlarged scale.
Fig. 4 is la cross-sectional view taken on line 4 4 of Fig. 1.
Fig. 5 is a cross-sectional view similar to Fig. 2 but taken on line 5-5 of the enlarged Fig. 3.
ICC
Fig. 6 is a cross-sectional View taken on line 6-6 of Fig. 3.
Fig. 7 is a diagrammatic view illustrating a method of making the product.
The finished product shown in Figs. 1-6 comprises the conductors 11 and 12 within the flattened tube 26. Transverse portions of the tube 20 are sealed together at spaced regions 21, 22, 23, 24, etc. along the length thereof. These spaced portions are rather short linearly with respect to the length of the cable but extend substantially from one conductor 11 to the other conductor 12 transversely of said cable as shown in Fig. 3.
intermediate the adjacent sealed portions 21-22, 22*23, etc. are unsealed areas, 2.5', 26, etc., at least one side of which tends to bulge outwardly to provide air filled regions between conductors 11 and 12.
A convenient way to I`make the cable of the invention is illustrated in Fig. 7. A tube is continuously extruded through nozzle 39 having an annular orice 31 and an opening 32 inside of the orifice area through which wires to be covered can be introduced. Thermoplastic tube forming material is introduced under pressure through conduit 33. The extruded tube 20 is drawn off and is passed between heated rollers 40, 41, each of which contain matching projections 43, 44 thereon. As the tube 26 passes between rollers 49, 41 portions of the tube 2t) along the length thereof are pressed together by heated projections 43, 44 and sealed or fused together to produce the device of Fig. 1.
It will be seen that the cable of the invention is very easy to make, requires less material than Where wires are completely embedded in dielectric material, provides a cable which has air as a dielectric and is very economic and effective. lf desired other iluids or gases besides air may be sealed into the cable.
The features and principles underlying the invention described above in connection with specific exempliiications will suggest to those skilled in the art many other modifications thereof. It is accordingly `desired that the appended claims shall not be limited to any specific feature or details thereof.
l claim:
l. ln a cable for the transmission of high frequency currents, a pair of conducting elements, and a flattened continuous tubular body of dielectric material surrounding said conducting elements, a first of said conducting elements extending along one side of said flattened tubular body, a second of said conducting elements extending along the opposite side of said flattened tubular body, said flattened tubular body having the opposite portions thereof united at spaced intervals to hold said body in flattened shape and to hold the said conductors in position at the side of said flattened tube and to provide spaced air bubbles within the tubular body extending between the conductors.
2. The process of making a transmission cable comprising the steps of continuously extruding a tube of insulating thermoplastic material, continuously introducing into the tube as it is extruded a pair of spaced conductors, continuously flattening said tube and sealing the tube at spaced portions along the length thereof to hold the tube in flattened condition and to position the said conductors along the edges of the flattened tube.
References Cited in the file of this patent UNITED STATES PATENTS 2,585,484 Menes Feb. 12, 1952 2,626,303 Link Ian. 20, 1953 FOREIGN PATENTS 738,034 Germany July 31, 1943
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378807A US2791624A (en) | 1953-09-08 | 1953-09-08 | Transmission cable for high frequencies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US378807A US2791624A (en) | 1953-09-08 | 1953-09-08 | Transmission cable for high frequencies |
Publications (1)
Publication Number | Publication Date |
---|---|
US2791624A true US2791624A (en) | 1957-05-07 |
Family
ID=23494624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US378807A Expired - Lifetime US2791624A (en) | 1953-09-08 | 1953-09-08 | Transmission cable for high frequencies |
Country Status (1)
Country | Link |
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US (1) | US2791624A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2976387A (en) * | 1958-05-28 | 1961-03-21 | Acra Electric Corp | Heater band |
US3833755A (en) * | 1973-08-16 | 1974-09-03 | Gore & Ass | Easily strippable ribbon cables |
US3833443A (en) * | 1972-10-20 | 1974-09-03 | Fortin Laminating Corp | Method of making flexible conductor cable |
US4397815A (en) * | 1980-09-02 | 1983-08-09 | Paul Troester Maschinenfabrik | Apparatus for the dry crosslinking of strands of elastomers |
US20060160402A1 (en) * | 2004-12-29 | 2006-07-20 | Kowalski Wayne J | Power limited circuit cable for plenum applications in a constant current lighting system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE738034C (en) * | 1937-06-05 | 1943-07-31 | Hans Bodo Willers | Method and device for producing an airspace-insulated electrical line |
US2585484A (en) * | 1947-06-25 | 1952-02-12 | Fairchild Camera Instr Co | Method of making high-frequency transmission line |
US2626303A (en) * | 1950-03-16 | 1953-01-20 | Le Roy J Link | Perforated ribbon mounting for electrical conductors |
-
1953
- 1953-09-08 US US378807A patent/US2791624A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE738034C (en) * | 1937-06-05 | 1943-07-31 | Hans Bodo Willers | Method and device for producing an airspace-insulated electrical line |
US2585484A (en) * | 1947-06-25 | 1952-02-12 | Fairchild Camera Instr Co | Method of making high-frequency transmission line |
US2626303A (en) * | 1950-03-16 | 1953-01-20 | Le Roy J Link | Perforated ribbon mounting for electrical conductors |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2976387A (en) * | 1958-05-28 | 1961-03-21 | Acra Electric Corp | Heater band |
US3833443A (en) * | 1972-10-20 | 1974-09-03 | Fortin Laminating Corp | Method of making flexible conductor cable |
US3833755A (en) * | 1973-08-16 | 1974-09-03 | Gore & Ass | Easily strippable ribbon cables |
US4397815A (en) * | 1980-09-02 | 1983-08-09 | Paul Troester Maschinenfabrik | Apparatus for the dry crosslinking of strands of elastomers |
US20060160402A1 (en) * | 2004-12-29 | 2006-07-20 | Kowalski Wayne J | Power limited circuit cable for plenum applications in a constant current lighting system |
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