US2663755A - Sheathed electric conductor - Google Patents
Sheathed electric conductor Download PDFInfo
- Publication number
- US2663755A US2663755A US118260A US11826049A US2663755A US 2663755 A US2663755 A US 2663755A US 118260 A US118260 A US 118260A US 11826049 A US11826049 A US 11826049A US 2663755 A US2663755 A US 2663755A
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- United States
- Prior art keywords
- cable
- envelope
- conductors
- sheath
- conductor
- 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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-
- 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
- H01B7/0823—Parallel wires, incorporated in a flat insulating profile
Definitions
- This invention relates to sheathed electric conductcrs and an object is to provide n improved construction of insulated electric conductor for general purposes which can be installed substantially anywhere.
- Rural electrification installations for example, are particularly severe and require a cable which is well insulated electrically, is well protected against mechanical injury and against moisture, acids, alkalis, oil, fungus, weather and sunlight and yet can be easily han died and readily bent to facilitate installation.
- 11 such installations it is also frequently necessary for the cable to withstand considerable tension, such, for example, as when the cable is required to span considerable distances without intervening supports, or when it is jerked and pulled around corners and through holes during installation.
- a feature of this invention is the provision of an electric cable having the necessary rugged insulation for prolonged service of the above type, constructed. and arranged to be so flexible as to permit ready installation thereof in and around sharp corners or wherever considerable bending of the cable is required, and which also has a greatly improved form of stress resisting means.
- a further feature of the invention is the provision in an insulated electric cable of a strong tension resisting member formed of an inorganic, non-conducting material which is not subject to rotting, fungus growth and other objectionable features common to strands of the type usually employed in cable insulation such as cotton, jute or the like.
- the tension member is such as to provide maximum strength with minimum size, so that no increase in the overall dimensions of the cable envelope is produced.
- a further feature is the provision of a multiconductor electric cable in which each individual conductor is slidable relatively to the insulating envelope. This feature contributes to the remarkable flexibility of the product permitting the cable to be bent as easily in the plane common to both conductors as in a direction at right angles thereto.
- Figure l is a perspective view of a multi-conductor cable constructed in accordance with one embodiment of this invention.
- Fig. 2 is a similar view of another embodiment.
- Figs. 3 and i are sectional views of the cable shown in Figs. 1 and 2, respectively.
- Fig. 5 is an elevation illustrating the easy flexibility of a cable constructed in accordance with the present invention.
- the electric conductors Ha, I20. are each surrounded by an individual insulating sheath 2
- is surrounded by a protective, reinforcing and insulating layer of stress resisting strand 23 and the two conductors with their respective sheaths and stress resisting layers are enclosed in a substantially flat envelope 22, which also is preferably of vinyl chloride Or a co-polymer.
- Such material provides the necessary strength and flexibility with a minimum size of strand so that the outside dimension of the insulating envelope is not increased by the presence of the strand.
- This is of especial advantagein a flat cable having a substantially flat envelope, as no increase in the outside dimension of the envelope is required.
- Fiber glass also has the advantage of being a good electrical insulator so that the presence of the strand does not decrease the insulation provided by the envelope between the electric conductors.
- each conductor is first supplied with the extruded sheath 2! by running through a suitable extruding die. Then the layer of stress resisting fiber glass is applied around each sheath, and such covered wires and sheaths are then fed through a suitable extruding machine to have the envelope 22 applied thereto.
- each conductor and its surrounding sheath is slidable relatively to the outer envelope 22, the intervening layer of fiber glass reducing the friction between each sheath and the surrounding envelope, so that this form of cable is as easily flexible in the plane of the conductors as in any other plane as is clear from Fig. 5.
- theiinsulating; envelope is also reinforced against clamping pressures as might be encountered in fastening the cable in position, and against serious defermation due to high pressures at. elevatedtem: peratures.
- the color of one sheath may be the same asthe envelope 2% as long as the other sheath is of a contrasting color.
- the-present invention prc vides an electric cable which can be used in practically any typeof installation; which will-easily; absorb the tensile stressesimpc-sed'on it and yet which is so flexible as to permit ready-installations around sharp corners and the like.
- the invention can be variouslyniedtiredi and;
- An electric cable oi indefinite-length corprising parallel conductors, an: extruded; fiexibl insulating sheath of homogeneous--thermoplastic material enclosing each conductcr,;an. extruded; flexible insulating envelope of, homogeneous thermoplastic material, encircling and; slidablyr engaging and enclosing each-ci saidsheaths', said; envelope being free or" interconnection with said: sheaths whereby to facilitate flex-ingot thecablein theplane of said conductors:andsaidenvelope,
- An electriccahle of indefinitelen'gth compris ing parallel'conductors, anextruded, flexible insulating sheath of homogeneous vinyl chloride enclosing each conductor, an extruded, flexible insulating envelopeof homogeneous vinyl chloride encircling and enclosing each of said sheaths and being slidable thereover, said envelope being free of 'any interconneeticn with said sheaths and prov'idin'g a largemass'of insulation extending be tween: said sheaths: for the full width of the sheathed conductors, whereby to facilitate sliding of the envelope on the sheaths incident to the flexing of the cable in the plane of said conductors,- and? a stress resisting member of fiber glass enclosed within saii envelope and extending-loingitudinally therethrough,
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- Insulated Conductors (AREA)
Description
Dec. 22, 1953 J. v. MCBRIDE 2,663,755
SHEATHED ELECTRIC CONDUCTOR Filed Sept. 28, 1949 Imnentor (fOZl/Z V M cbm'cle (Ittomeg s Patented Dec. 22, 1953 SHEATHED ELECTRIC CONDUCTOR John V. McBride, Lebanon, Conn., assignor to The Plastic Wire & Cable Corporation, Jewett City, Conn., a corporation of Connecticut Application September 28, 1949, Serial No. 118,260
4 Claims. 1
This invention relates to sheathed electric conductcrs and an object is to provide n improved construction of insulated electric conductor for general purposes which can be installed substantially anywhere. Rural electrification installations, for example, are particularly severe and require a cable which is well insulated electrically, is well protected against mechanical injury and against moisture, acids, alkalis, oil, fungus, weather and sunlight and yet can be easily han died and readily bent to facilitate installation. 11 such installations it is also frequently necessary for the cable to withstand considerable tension, such, for example, as when the cable is required to span considerable distances without intervening supports, or when it is jerked and pulled around corners and through holes during installation. This calls for a cable having sufficient tensile strength to provide a greater margin of safety than is usually found in a cable which is also constructed to have the desired flexibility. Also, although cables have heretofore been provided with tension resistant cords or the like, they have been unsatisfactory because subject to rotting, or fungus growth, or objectionable for other reasons.
A feature of this invention is the provision of an electric cable having the necessary rugged insulation for prolonged service of the above type, constructed. and arranged to be so flexible as to permit ready installation thereof in and around sharp corners or wherever considerable bending of the cable is required, and which also has a greatly improved form of stress resisting means.
A further feature of the invention is the provision in an insulated electric cable of a strong tension resisting member formed of an inorganic, non-conducting material which is not subject to rotting, fungus growth and other objectionable features common to strands of the type usually employed in cable insulation such as cotton, jute or the like. The tension member is such as to provide maximum strength with minimum size, so that no increase in the overall dimensions of the cable envelope is produced.
A further feature is the provision of a multiconductor electric cable in which each individual conductor is slidable relatively to the insulating envelope. This feature contributes to the remarkable flexibility of the product permitting the cable to be bent as easily in the plane common to both conductors as in a direction at right angles thereto.
These and other objects and advantageous features are accomplished by the present invention.
In the accompanying drawings:
Figure l is a perspective view of a multi-conductor cable constructed in accordance with one embodiment of this invention.
Fig. 2 is a similar view of another embodiment.
Figs. 3 and i are sectional views of the cable shown in Figs. 1 and 2, respectively.
Fig. 5 is an elevation illustrating the easy flexibility of a cable constructed in accordance with the present invention.
Although the drawings illustrate different modifications of the invention incorporated in a two-conductor cable, it will be apparent that the invention is equally applicable to single conductor cables as well as to cables having more than two conductors, if desired.
In the form of the invention shown in Fig. 2 the electric conductors Ha, I20. are each surrounded by an individual insulating sheath 2|, preferably of the same material as the outer env-elope 22, such as vinyl chloride or a co-polymer. Each sheath 2| is surrounded by a protective, reinforcing and insulating layer of stress resisting strand 23 and the two conductors with their respective sheaths and stress resisting layers are enclosed in a substantially flat envelope 22, which also is preferably of vinyl chloride Or a co-polymer.
In order to avoid deterioration of the stress resisting strand due to rotting, fungus growth and other causes of deterioration heretofore encountered, I form the strand of inorganic, nonconducting material, preferably of fiber glass. Such material provides the necessary strength and flexibility with a minimum size of strand so that the outside dimension of the insulating envelope is not increased by the presence of the strand. This is of especial advantagein a flat cable having a substantially flat envelope, as no increase in the outside dimension of the envelope is required. Fiber glass also has the advantage of being a good electrical insulator so that the presence of the strand does not decrease the insulation provided by the envelope between the electric conductors.
In this embodiment, each conductor is first supplied with the extruded sheath 2! by running through a suitable extruding die. Then the layer of stress resisting fiber glass is applied around each sheath, and such covered wires and sheaths are then fed through a suitable extruding machine to have the envelope 22 applied thereto.
In this embodiment of the invention it will be found that each conductor and its surrounding sheath is slidable relatively to the outer envelope 22, the intervening layer of fiber glass reducing the friction between each sheath and the surrounding envelope, so that this form of cable is as easily flexible in the plane of the conductors as in any other plane as is clear from Fig. 5. With the fiber glass surrounding the conductors as in this form of theinvention theiinsulating; envelope is also reinforced against clamping pressures as might be encountered in fastening the cable in position, and against serious defermation due to high pressures at. elevatedtem: peratures.
As illustrated in Figs. 2 and 4;,th'e;oonchictors: l 5?), i272 are enclosed in separateisheaths=25 similar to the 2! each sheath' having-an=iden=- tifying or indicating characteristi such for; example as a distinctive contrasting color. The color of one sheath may be the same asthe envelope 2% as long as the other sheath is of a contrasting color.. ln-this;embodiment arstressx resisting cord itboffiber glassis employed-and extends longitudinally of the cable: parallel, to the conductors and, as illustrated, is substantially midway between them.
ltwill be seen that the-present invention prc vides an electric cable which can be used in practically any typeof installation; which will-easily; absorb the tensile stressesimpc-sed'on it and yet which is so flexible as to permit ready-installations around sharp corners and the like.-
Although the drawing shows theinventionaanplied to. cable having solid conductors,.it.willileev understood that the, invention: is equally: well, adapted to cables havingany other form-offcone ductonstranded or; otherwise.
The invention can be variouslyniediiledi and;
layer of fiber glass surrounding-each c fi' saidgconx-- doctors {within said envelope and enclosed. theree by..
2. An electric cable oi indefinite-length corprising parallel conductors, an: extruded; fiexibl insulating sheath of homogeneous--thermoplastic material enclosing each conductcr,;an. extruded; flexible insulating envelope of, homogeneous thermoplastic material, encircling and; slidablyr engaging and enclosing each-ci saidsheaths', said; envelope being free or" interconnection with said: sheaths whereby to facilitate flex-ingot thecablein theplane of said conductors:andsaidenvelope,
l providing a large mass of insulation extending between said sheaths for the full width of the sheathed conductors, and a stress resisting member of fiber glass material enclosed within said envelope and extending longitudinally through said mass of insulation parallel to said conductors.
3. An electriccahle of indefinitelen'gthcompris ing parallel'conductors, anextruded, flexible insulating sheath of homogeneous vinyl chloride enclosing each conductor, an extruded, flexible insulating envelopeof homogeneous vinyl chloride encircling and enclosing each of said sheaths and being slidable thereover, said envelope being free of 'any interconneeticn with said sheaths and prov'idin'g a largemass'of insulation extending be tween: said sheaths: for the full width of the sheathed conductors, whereby to facilitate sliding of the envelope on the sheaths incident to the flexing of the cable in the plane of said conductors,- and? a stress resisting member of fiber glass enclosed within saii envelope and extending-loingitudinally therethrough,
4e- An elect to cableof inclefinitelength com-- prising parallel conductors, an extruded; flexible sheath of homogeneous vinyl chloride enclosing each conductor; a layer of inorganicnon-con ducting stress resisting fiber" glass surrounding each-sheath; and an extruded; flexible envelope of homogeneous vinyl chloride surrounding and slid ably engaging and enclosing each of" said files" glass layers; wherebyto-facilitate flexing of cable in the plane of said conductors; said envelopeforming a solid mass :between' said sheaths forthe full width of the'sheathed conductors-to maintain said conductors in predetermined spaced relation;
JGHNV. MCBRIDE:
References ones in the file. of. thi'slpabent'.
UNI-P3111 PATENTS Number Name 1 Date:
1,729,160 Engle Sept. 24; 1926* 21195393 Lewis etal; May 31,1938 2,163,119 Freeland June zo 193-9 22152830 Rose et al; Oct: 22; 19% 22355231. l-lull- Mar; 13; 194i 2,306,533- rederickson Dec: 29; 1942' 2525,549 Eyzowitz- July-27, 1943' 2,361,374 Abbott Oct; 31,1944 2,434,793 Feast'er- Jan.- 20; 1948 2,446,292 lvlcConnelPet alE Aug 3; 1948 2,479,919 Flood Aug. 23,1949 2,526,483 Ingmanson Oct. 17, 2,544,233 Kennedy Mar; 6; 1951 PATENTS "tn-libel. I Country, Date 461,101" Great" Britain lfehlO; 193.7, 547,461" Great- Britain Aug 28,1942 555,354 GreatBritain Aug,l3,,l9 l3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US118260A US2663755A (en) | 1949-09-28 | 1949-09-28 | Sheathed electric conductor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US118260A US2663755A (en) | 1949-09-28 | 1949-09-28 | Sheathed electric conductor |
Publications (1)
Publication Number | Publication Date |
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US2663755A true US2663755A (en) | 1953-12-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US118260A Expired - Lifetime US2663755A (en) | 1949-09-28 | 1949-09-28 | Sheathed electric conductor |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2809230A (en) * | 1952-09-27 | 1957-10-08 | Westinghouse Electric Corp | Insulated coil |
US2851515A (en) * | 1955-12-19 | 1958-09-09 | Anaconda Wire & Cable Co | Compression resistant electric cable |
US2877708A (en) * | 1955-07-08 | 1959-03-17 | Rey Freres & Cie Ets | Detonating fuse |
US3134845A (en) * | 1961-02-13 | 1964-05-26 | Gen Cable Corp | Telephone drop wire |
US4220812A (en) * | 1977-06-17 | 1980-09-02 | Lynenwerk Gmbh & Co. Kommanditgesellschaft | Electric cable for communication purposes |
US4467138A (en) * | 1983-01-17 | 1984-08-21 | Gk Technologies, Inc. | Plural conductor communication wire |
US4638117A (en) * | 1985-06-14 | 1987-01-20 | Lynenwerk Gmbh & Co. Kommanditgesellschaft | Electrical cable for communication purposes |
US4761053A (en) * | 1985-08-28 | 1988-08-02 | American Telephone And Telegraph Company, At&T Bell Laboratories | Communications transmission media |
WO1994011887A1 (en) * | 1992-11-09 | 1994-05-26 | Atlas Copco Tools Ab | Multi-core cable for communicating electric power and electrical signals between a hand held power nutrunner and a power supply and control unit |
US20050016370A1 (en) * | 2003-03-07 | 2005-01-27 | O'brien John P. | Redundant signal transmission system and deployment means |
Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1729160A (en) * | 1926-02-23 | 1929-09-24 | Fansteel Prod Co Inc | Rubber-coated conductor and method of making same |
GB461101A (en) * | 1935-03-15 | 1937-02-10 | British Thomson Houston Co Ltd | Improvements in and relating to insulated electric conductors |
US2119393A (en) * | 1934-07-18 | 1938-05-31 | Gen Electric | Electric cable and method of manufacturing the same |
US2163119A (en) * | 1937-12-07 | 1939-06-20 | Anaconda Wire & Cable Co | Magnet wire |
US2218830A (en) * | 1939-05-13 | 1940-10-22 | Climax Radio & Television Co I | Combined antenna and power cord |
US2235523A (en) * | 1938-11-12 | 1941-03-18 | Gen Electric | Electric cord |
GB547461A (en) * | 1941-02-27 | 1942-08-28 | Henleys Telegraph Works Co Ltd | Improvements in electric cables |
US2306533A (en) * | 1940-03-11 | 1942-12-29 | Nat Electric Prod Corp | Electrical conductor |
US2325549A (en) * | 1941-05-24 | 1943-07-27 | Okonite Co | Ignition cable |
GB555354A (en) * | 1941-05-21 | 1943-08-18 | Okonite Co | An improved insulated electric wire suitable for field telephone purposes |
US2361374A (en) * | 1941-10-25 | 1944-10-31 | Charles W Abbott | Insulated conductor construction |
US2434793A (en) * | 1944-11-11 | 1948-01-20 | Edward B Feaster | Electric cord |
US2446292A (en) * | 1945-06-08 | 1948-08-03 | Us Rubber Co | Insulated electrical conductor |
US2479919A (en) * | 1945-11-27 | 1949-08-23 | Plastic Wire & Cable Corp | Method of covering a wire having interstices therein |
US2526483A (en) * | 1949-04-26 | 1950-10-17 | Whitney Blake Co | Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article |
US2544233A (en) * | 1949-08-13 | 1951-03-06 | Nat Electric Prod Corp | Nonmetallic sheathed multiconductor cable |
-
1949
- 1949-09-28 US US118260A patent/US2663755A/en not_active Expired - Lifetime
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1729160A (en) * | 1926-02-23 | 1929-09-24 | Fansteel Prod Co Inc | Rubber-coated conductor and method of making same |
US2119393A (en) * | 1934-07-18 | 1938-05-31 | Gen Electric | Electric cable and method of manufacturing the same |
GB461101A (en) * | 1935-03-15 | 1937-02-10 | British Thomson Houston Co Ltd | Improvements in and relating to insulated electric conductors |
US2163119A (en) * | 1937-12-07 | 1939-06-20 | Anaconda Wire & Cable Co | Magnet wire |
US2235523A (en) * | 1938-11-12 | 1941-03-18 | Gen Electric | Electric cord |
US2218830A (en) * | 1939-05-13 | 1940-10-22 | Climax Radio & Television Co I | Combined antenna and power cord |
US2306533A (en) * | 1940-03-11 | 1942-12-29 | Nat Electric Prod Corp | Electrical conductor |
GB547461A (en) * | 1941-02-27 | 1942-08-28 | Henleys Telegraph Works Co Ltd | Improvements in electric cables |
GB555354A (en) * | 1941-05-21 | 1943-08-18 | Okonite Co | An improved insulated electric wire suitable for field telephone purposes |
US2325549A (en) * | 1941-05-24 | 1943-07-27 | Okonite Co | Ignition cable |
US2361374A (en) * | 1941-10-25 | 1944-10-31 | Charles W Abbott | Insulated conductor construction |
US2434793A (en) * | 1944-11-11 | 1948-01-20 | Edward B Feaster | Electric cord |
US2446292A (en) * | 1945-06-08 | 1948-08-03 | Us Rubber Co | Insulated electrical conductor |
US2479919A (en) * | 1945-11-27 | 1949-08-23 | Plastic Wire & Cable Corp | Method of covering a wire having interstices therein |
US2526483A (en) * | 1949-04-26 | 1950-10-17 | Whitney Blake Co | Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article |
US2544233A (en) * | 1949-08-13 | 1951-03-06 | Nat Electric Prod Corp | Nonmetallic sheathed multiconductor cable |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2809230A (en) * | 1952-09-27 | 1957-10-08 | Westinghouse Electric Corp | Insulated coil |
US2877708A (en) * | 1955-07-08 | 1959-03-17 | Rey Freres & Cie Ets | Detonating fuse |
US2851515A (en) * | 1955-12-19 | 1958-09-09 | Anaconda Wire & Cable Co | Compression resistant electric cable |
US3134845A (en) * | 1961-02-13 | 1964-05-26 | Gen Cable Corp | Telephone drop wire |
US4220812A (en) * | 1977-06-17 | 1980-09-02 | Lynenwerk Gmbh & Co. Kommanditgesellschaft | Electric cable for communication purposes |
US4467138A (en) * | 1983-01-17 | 1984-08-21 | Gk Technologies, Inc. | Plural conductor communication wire |
US4638117A (en) * | 1985-06-14 | 1987-01-20 | Lynenwerk Gmbh & Co. Kommanditgesellschaft | Electrical cable for communication purposes |
US4761053A (en) * | 1985-08-28 | 1988-08-02 | American Telephone And Telegraph Company, At&T Bell Laboratories | Communications transmission media |
WO1994011887A1 (en) * | 1992-11-09 | 1994-05-26 | Atlas Copco Tools Ab | Multi-core cable for communicating electric power and electrical signals between a hand held power nutrunner and a power supply and control unit |
US5750932A (en) * | 1992-11-09 | 1998-05-12 | Atlas Copco Tools Ab | Multi-core cable for electrically communicating a hand held power nutrunner with a power supply and control unit |
US20050016370A1 (en) * | 2003-03-07 | 2005-01-27 | O'brien John P. | Redundant signal transmission system and deployment means |
US7086335B2 (en) * | 2003-03-07 | 2006-08-08 | Shock Tube Systems, Inc. | Redundant signal transmission system and deployment means |
US20060185505A1 (en) * | 2003-03-07 | 2006-08-24 | Shock Tube Systems, Inc. | Redundant signal transmission system and development method |
US7162957B2 (en) | 2003-03-07 | 2007-01-16 | Shock Tube Systems, Inc. | Redundant signal transmission system and development method |
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