IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0497586
(2009-07-03)
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등록번호 |
US-8701277
(2014-04-22)
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발명자
/ 주소 |
- Kummer, Randy D.
- Reece, David
- Dixon, Mark D.
- Carlson, John R.
- Lam, Hai
- Sasse, Philip
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
9 인용 특허 :
89 |
초록
▼
Disclosed is a method of manufacturing a finished cable by a process directed to reduce the amount of force required to install the cable. The process involves the extrusion of the cable's outer sheath and the incorporation of a pulling lubricant in connection with, and prior to the completion of, t
Disclosed is a method of manufacturing a finished cable by a process directed to reduce the amount of force required to install the cable. The process involves the extrusion of the cable's outer sheath and the incorporation of a pulling lubricant in connection with, and prior to the completion of, the extrusion to reduce the sheath's surface coefficient of friction as well as reduce the required force to pull the cable for installation. The conductor core is coated with an extruded plastic material with which an appropriate (in amount and type) pulling lubricant is initially combined with the plastic material prior to the formation of the sheath and in which the sheathed conductor core is thereafter cooled, the lubricant either migrating to and/or permeating the sheath to be available at the surface of the sheath at the time of the cable's installation. The preselected lubricant is disclosed as either combined with the plastic material during initial pelletization, or mixed with the plastic pellets prior to introduction of the mixture into the extruding head, or introduced into the extruding head at a separate location downstream from where the plastic material is introduced into the extruding head.
대표청구항
▼
1. A method of installing an electrical cable through angled building conduits or passageways through internal sections of walls, ceilings, conduits, rafters or joists in a manner that reduces the amount of force required for such installation, said method comprising: (a) selecting a finished electr
1. A method of installing an electrical cable through angled building conduits or passageways through internal sections of walls, ceilings, conduits, rafters or joists in a manner that reduces the amount of force required for such installation, said method comprising: (a) selecting a finished electrical cable having an outermost extruded protective jacket of preselected material surrounding a conductor core, the cable of the type in which a preselected lubricant has been internally combined with the preselected jacket material in connection with the extrusion, and prior to the completion of formation, of the extruded jacket, the lubricant having been effective to migrate through, or permeate, the jacket to be available at the exterior surface of the jacket, and reduce the amount of force required to install the cable through the angled building conduits or passageways through the internal sections of walls, ceilings, conduits, rafters or joists, at the time the cable is to be installed; and(b) installing said cable in the building conduits or passageways without need of adding any additional external lubricant to the exterior surface besides said preselected internal lubricant. 2. A method of providing a finished electrical cable for installation through angled building conduits or passageways through internal sections of walls, ceilings, conduits, rafters or joists, the cable having lubrication embodied in its outermost jacket sufficient to reduce the amount of force required to pull the cable through said angled building conduits or passageways and without the need for additional lubrication at the exterior surface of said outermost jacket, comprising: (a) extruding only a single jacket of plastic material during the manufacture of the cable to surround at least an electrical conductor of the cable, said jacket also constituting the said outermost jacket of the cable, and(b) introducing sufficient lubricant into said plastic material in connection with the extruding, and prior to the completion of formation of said single jacket to provide said reduced amount of force, such lubricant being of the type which either migrates through, or permeates, the said plastic material to be available at the exterior surface of said outermost jacket at the time of installation of the cable; and(c) providing said so jacketed cable for its installation without need of adding any external lubrication to said jacket. 3. The method as defined by claim 2, in which the introduction of said lubricant into said plastic material in connection with the extruding is by at least one of the following: (i) combining said lubricant with the plastic material to form pellets of lubricated plastic material and the so-lubricated plastic material pellets thereafter used for said extruding, or (ii) mixing the lubricant with formed pellets of plastic material and the so-lubricated plastic material pellets thereafter used for said extruding, or (iii) directly injecting the lubricant into the plastic material extrudant during the extruding of said jacket. 4. A method of providing a finished electrical cable for installation through angled building conduits or passageways through internal sections of walls, ceilings, conduits rafters or joists, the cable having lubrication embodied in its outermost jacket sufficient to reduce the amount of force required to pull the cable through the angled building conduits or passageways through the internal sections of walls, ceilings, conduits rafters or joists, and without the need for additional lubrication at the exterior surface of said outermost jacket, comprising: (a) extruding a jacket of polyvinylchloride (PVC) material during the manufacture of the cable to surround at least an electrical conductor of the cable, said jacket also constituting the said outermost jacket of the cable, and(b) introducing sufficient lubricant into said PVC material in connection with the extruding of the jacket prior to the completion of the formation of said jacket to provide said reduced amount of force, such lubricant being of the type which migrates through said PVC material to be available at the exterior surface of said outermost jacket at the time of said installation of the cable; and(c) providing said so jacketed cable for its installation without need of adding any external lubrication to said jacket. 5. In a method of manufacturing a finished electrical cable having at least one conductor and surrounding insulation and a jacket of plastic material surrounding said conductor and said insulation, with a step of extruding said jacket defining the outermost exterior surface of the finished cable, the improvement comprising: introducing sufficient lubricant into said material in connection with said extruding, and prior to the completion of formation, of said jacket to reduce the amount of force required to pull the cable during its installation through angled building conduits or passageways through internal sections of walls, ceilings, conduits rafters or joists in which said lubricant is of the type which migrates through said material to be available at the said outermost exterior surface during said installation. 6. In a method of manufacturing a finished electrical cable having at least one conductor and surrounding insulation, and a protective jacket of plastic material surrounding said conductor and said insulation, said jacket defining the outermost exterior surface of the finished cable, the improvement comprising: forming said protective jacket; andintroducing sufficient lubricant into said plastic material in connection with said forming, and prior to the completion of formation, of said protective jacket in order to reduce the amount of force required to pull the cable during its installation through angled building conduits or passageways through internal sections of walls ceilings, conduits, rafters or joists, in which said lubricant is of the type which permeates said material to be continuously available at the said outermost exterior surface during said installation. 7. A method of manufacturing a finished electrical cable having a conductor core and a jacket of a first material, the jacket surrounding at least said conductor core and defining the outermost exterior surface of the finished cable, comprising combining a preselected lubricant with said first material in connection with the formation of the jacket, the lubricant being sufficient so as to reduce the amount of force required to install the cable through angled building passageways, the lubricant further being of the type which migrates through said jacket to be available at said outermost exterior surface of said finished cable during the cable's installation through said angled building passageways. 8. The method as defined by claim 7 in which the angled building passageways are through internal sections of walls and ceilings of the building. 9. The method as defined by claim 7 in which the angled building passageways are through rafters of the building. 10. The method as defined by claim 7 in which the angled building passageways are through joists of the building. 11. The method as defined by claim 7 in which the building passageways are through angled conduits of the building. 12. In a method of manufacturing a finished electrical cable having a conductor core and a jacket formed primarily of a first material, the jacket surrounding at least said conductor core and defining the outermost exterior surface of the finished cable, the improvement comprising combining a preselected lubricant with said first material in connection with, but prior to the completion of, the formation of the jacket, such that the force required to install the cable during its installation through angled building passageways through internal sections of walls, ceilings, conduits, rafters or joists is reduced, in which said lubricant is of the type which permeates said jacket to be continuously available at the said cable outermost exterior surface during its installation through said angled building passageways. 13. The method as defined by claim 12 in which the angled building passageways are through internal sections of walls and ceilings of the building. 14. The method as defined by claim 12 in which the angled building passageways are through rafters of the building. 15. The method as defined by claim 12 in which the angled building passageways are through joists of the building. 16. The method as defined by claim 12 in which the preselected lubricant is such as to reduce the required force for installation of the cable through the angled building passageways and through angled building conduits. 17. The method as defined in either claim 7 or claim 12, in which said combining is effected by combining said preselected lubricant with said first material in non-pellet form, thereby to form lubricated material pellets, and extruding the jacket with use of the so-lubricated material pellets. 18. The method as defined in either claim 7 or claim 12, in which said combining is effected by injecting said first material in non-lubricated form into an extruding head at a first location and injecting the said preselected lubricant into said extruding head at a second location downstream from said first location, while extruding said jacket through said extruding head. 19. The method as defined in either claim 7 or claim 12, in which said combining is effected by combining said preselected lubricant with pellets of said first material, and extruding the jacket with use of the so-lubricated material pellets. 20. In a method of manufacturing a finished electrical cable of the type having a conductor core, and an outermost jacket defining the exterior surface of the finished cable, the improvement comprising (a) extruding the outermost jacket, and (b) assuring the introduction of a preselected lubricant in connection with the extruding of the jacket of the type and sufficiency that enables the lubricant to either permeate, or migrate through, said jacket to be available at said cable exterior surface at the time of the finished cable's installation through angled building passageways through internal sections of walls, ceilings, conduits rafters or joists, so as to reduce the amount of force required to install the finished cable through said building passageways. 21. The method as defined by any one of the claim 1, 2, 4, 5, 6, 7, 12, or 20, in which the finished electrical cable additionally has the characteristic that an amount of force required to install said cable through corresponding holes in an arrangement of four 2″×4″ wood blocks, with the holes being drilled at an angle through the broad face and the centerlines of the holes offset, and the cable pulled through at an angle to the horizontal from the last block, is less than the amount of force required to install a non-lubricated cable of the same cable type and size through corresponding holes in said arrangement. 22. A method of manufacturing a finished electrical cable of the type having a conductor core and surrounding extruded sheath of lubricated plastic material, the sheath defining the exterior surface of the cable, said method comprising; (a) preselecting a lubricant by both type and sufficiency to so interact with said preselected plastic material as to either migrate through or permeate said surrounding sheath so as to be available at the exterior surface of said sheath to facilitate the cable's installation, said lubricant further selected to be sufficient to reduce the amount of pulling force required to install the finished cable through angled building passageways or conduits with said lubricant from that pulling force required to install a finished electrical cable without said lubricant through said angled building passageways or conduits;(b) combining said lubricant with said plastic material for at least one of (i) lubricated pellet formation for the extrusion, and (ii) injection into the extrudant during the extrusion, of the sheath; and(c) completing the extruding of the so combined lubricant and plastic material around said conductor core to form said lubricated sheath. 23. The method of manufacturing defined by claim 22, further including the step of verifying, after said extruding, that the installation pulling force had been reduced, said verifying being by quantifiably determining the ease of pulling of said finished electrical cable.
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