US2057431A - Method of making resistance elements - Google Patents

Method of making resistance elements Download PDF

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US2057431A
US2057431A US663367A US66336733A US2057431A US 2057431 A US2057431 A US 2057431A US 663367 A US663367 A US 663367A US 66336733 A US66336733 A US 66336733A US 2057431 A US2057431 A US 2057431A
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tube
elements
resistance elements
resistance
carbon
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US663367A
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Raymond H Hobrock
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20Conductive material dispersed in non-conductive organic material
    • H01B1/24Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon

Definitions

  • a winding II of resistance material is wound about the tube 9 and is connected to the secondary of a transformer 12 for passing a current through the winding to supplement the heating of the tube 6.
  • the secondary of the transformer has a variable resistance 13 therein to control the current in the winding I I.

Description

Oct. 13, 1936. R H. HOBROCK 2,057,431 7 METHOD OF MAKING RESISTANCE ELEMENTS Filed March 29, 1933 FIG.
Patented a. 1a, 1936' UNITED STATES METHOD OF MAKING RESISTANCE ELEMENTS Raymond E. Hobrock, Akron, Ohio Application March 29, 1933, Serial No. 683,38!
Claims.
My invention relates to resistance elements and a method of making resistance elements.
Many attempts have been made heretofore to produce resistance elements by mechanically 5 mixing finely divided carbon particles with ceramic materials and forming the mixture into rods or blocks which are then fused into ceramic resistance elements. This procedure requires prolonged mixing of the materials and the resulting resistance elements have many undesirable electrical characteristics.
An object of the present invention is to provide an effective and efficient resistance element and a simple and economical method of making such an element.
A further object is to provide a resistance element which has a substantially straight line voltage current characteristic.
A further object is to provide a thermo-chemical method of incorporating carbon particles in a. ceramic base.
Other objects and advantages will appear as the description proceeds.
In accordance with one embodiment of the invention, a ceramic article or rod is placed in an atmosphere of a hydrocarbon gas and heated to the disassociation temperature of the gas whereupon the precipitated carbon permeates the ceramic article to form a resistance element thereof.
A complete understanding of the invention may be had by reference to the following description taken in conjunction with the accompanying drawing, in which Fig. 1 is a sectional view, partly diagrammatic, of an apparatus for practicing the method and making articles of this invention;
Fig. 2 is a sectional view, partly diagrammatic,
- of an apparatus for applying terminals to resistance elements; and
Fig. 3 is a perspective view of a resistance element embodying the invention.
The base of the resistance element of this invention consists of a porous insulating body 5 preferably of a ceramic material. In'order to impregnate or saturate such bodies with carbon, a number of such bodies are fed into a tube 6 of a furnace I. This tube is preferably made of resistance material, such as a nickel chromium alloy known as nichrome and is heated by passing an electric current therethrough from a source not shown. The amount of current passing therethrough may be regulated by means of a. variable resistance 8. Surrounding the tube 6 is an enclosed air space formed by a second tube 9 of a refractory insulating material, such as Silmanite. A winding II of resistance material is wound about the tube 9 and is connected to the secondary of a transformer 12 for passing a current through the winding to supplement the heating of the tube 6. The secondary of the transformer has a variable resistance 13 therein to control the current in the winding I I.
It has been found that when a number of bodies to be impregnated with carbon are fed into the tube 6 and are heated to the desired temperature at the entrance end of the tube, they will attain too high a. temperature before reaching the exit end unless some means is provided to reduce the amount of heat supplied to the bodies after they reach the desired temperature. This difficulty is overcome by spacing the convolutions of the winding ll closely together at the entrance end of the tube to quickly bring the bodies to the desired temperature and spacing the convolutions farther apart in that portion of the tube where the bodies have reached the desired temperature.
Surrounding the tube 9 and spaced therefrom is a casing H which is filled with heat insulating material l5, such as asbestos wool or the like.
The tube 6 projects from both ends of the easing and is preferably tilted to aid in feeding the elements to be treated therethrough. At the lower end of tube 6 a. supply tube I6 is connected thereto for supplying a carbon compound, such as a hydrocarbon gas, to the tube 6. Any suitable gas, may be used, such as ordinary illuminating gas, methane, propane, water gas, and the like.
In order to prevent too large a portion of the gas from escaping from the lower end of the tube,
a baflle I1 is placed in this end of the tube so that substantially an equal amount of gas escapes from each end. The escaping gas is ignited at each end of the tube and forms a flame seal to prevent air from entering the ends of the tube.
The elements to be impregnated may be placed in a chute i8 and are fed successively into the furnace by a reciprocating plunger l9 which may be actuated by an eccentric 2| driven by a source of power not shown. As the elements enter the furnace, they are raised to a high temperature and the gas in the furnace is heated to its disassociation temperature to precipitate nascent carbon which permeates the elements. The resistance of the elements may be controlled by the amount of carbon absorbed thereby depending upon the time the elements are in the furnace.
In order to use the resistance elements in a circult, caps of conducting material may be pressed over the ends thereof or soldered thereto. A conducting surface or terminal may also be formed on each end of an element by cathode sputtering. For this purpose a number of elements are placed in a receptacle 22 with the upper ends of the elements exposed. The receptacle is then placed in a bell II resting on a base '24. The upper end of the bell is provided with a silver, copper, or
I gold electrode II and the bell is evacuated through a tube 2!. This tube has an oiiset portion 21 which has a second electrode 2| therein. After the bell is evacuated. a high potential is applied to the electrodes through a transformer 20, causing metal from electrode 2| to be deposed on the upper ends of the resistance elements in a thin layer. The lower ends or the elements are then provided with metal layers in the same manner. Terminal members may then be soldered, clamped or otherwise secured to the metal layers on the ends of the resistance elements. Another method of securing terminals to the resistance elements is to metal spray the ends by a process well known in the art and then soldering terminal members thereto.
It will be understood that the nature and embodiments oi' the invention herein described and illustrated are merely illustrative of the invention and that many changes and modifications may be made therein without departing from the spirit and scope of the invention.
What is claimed is:
. hydrocarbon atmosphere of the methane series containing molecular carbon to impregnate the article throughout.
4. A method of making a resistance element, which comprises generating nascent carbon from a hydrocarbon gas of the methane series and impregnating a porous insulating body therewith to a substantial depth.
5. A method of making a resistance element which comprises heating a ceramic body in an atmosphere of a hydrocarbon oi the methane series capable of precipitating carbon in a iorm to impregnate said body throughout.
RAYMOND H. HOBROC K.
US663367A 1933-03-29 1933-03-29 Method of making resistance elements Expired - Lifetime US2057431A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453192A (en) * 1944-09-08 1948-11-09 Bell Telephone Labor Inc Moisture impervious vent
US2487581A (en) * 1948-03-31 1949-11-08 Theodore R Palumbo Electrical resistor and method of making same
US2587036A (en) * 1946-03-12 1952-02-26 Bell Telephone Labor Inc Process and apparatus for semicontinuous plating
US2604936A (en) * 1946-01-15 1952-07-29 Metal Carbides Corp Method and apparatus for controlling the generation and application of heat
US2635994A (en) * 1950-04-27 1953-04-21 Sprague Electric Co Production of carbon resistors
US2637754A (en) * 1950-12-13 1953-05-05 Sylvania Electric Prod Oven construction
US2671159A (en) * 1952-07-02 1954-03-02 Philip L O'donnell Tape dispensing machine
US2706761A (en) * 1951-04-19 1955-04-19 Becton Dickinson Co Apparatus for making thermometers
US2778743A (en) * 1954-11-16 1957-01-22 Bell Telephone Labor Inc Method of making electrical carbonfilm resistors
US2791522A (en) * 1955-09-20 1957-05-07 Raytheon Mfg Co Insulated ceramic conductors
US2810365A (en) * 1952-12-31 1957-10-22 Shallcross Mfg Company Apparatus for resistor film deposition
US2810664A (en) * 1954-05-24 1957-10-22 Int Resistance Co Method for pyrolytic deposition of resistance films
US2853969A (en) * 1953-06-10 1958-09-30 Erie Resistor Ltd Apparatus for producing electric resistors
US2880120A (en) * 1954-05-04 1959-03-31 Sperry Rand Corp Method of manufacturing a microwave attenuator for travelling wave tube
US2901381A (en) * 1956-10-12 1959-08-25 Bell Telephone Labor Inc Method of making electrical resistors
US2958899A (en) * 1953-10-09 1960-11-08 Int Resistance Co Apparatus for deposition of solids from vapors
US3139396A (en) * 1962-06-28 1964-06-30 Bell Telephone Labor Inc Tin oxide resistors
US3307515A (en) * 1963-08-15 1967-03-07 Mallory & Co Inc P R Vapor deposition apparatus including tumbler
US3390452A (en) * 1963-03-29 1968-07-02 Irc Inc Method of making an electrical resistor
US4946370A (en) * 1985-03-20 1990-08-07 Sharp Kabushiki Kaisha Method for the production of carbon films having an oriented graphite structure
US20080097225A1 (en) * 2006-10-19 2008-04-24 The General Hospital Corporation Apparatus and method for obtaining and providing imaging information associated with at least one portion of a sample, and effecting such portion(s)
US20080100837A1 (en) * 2002-01-24 2008-05-01 The General Hospital Corporation Apparatus and method for ranging and noise reduction of low coherence interferometry lci and optical coherence tomography oct signals by parallel detection of spectral bands
EP2750143A2 (en) 2012-12-27 2014-07-02 Zidkiyahu Simenhaus High voltage transmission line cable based on textile composite material

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453192A (en) * 1944-09-08 1948-11-09 Bell Telephone Labor Inc Moisture impervious vent
US2604936A (en) * 1946-01-15 1952-07-29 Metal Carbides Corp Method and apparatus for controlling the generation and application of heat
US2587036A (en) * 1946-03-12 1952-02-26 Bell Telephone Labor Inc Process and apparatus for semicontinuous plating
US2487581A (en) * 1948-03-31 1949-11-08 Theodore R Palumbo Electrical resistor and method of making same
US2635994A (en) * 1950-04-27 1953-04-21 Sprague Electric Co Production of carbon resistors
US2637754A (en) * 1950-12-13 1953-05-05 Sylvania Electric Prod Oven construction
US2706761A (en) * 1951-04-19 1955-04-19 Becton Dickinson Co Apparatus for making thermometers
US2671159A (en) * 1952-07-02 1954-03-02 Philip L O'donnell Tape dispensing machine
US2810365A (en) * 1952-12-31 1957-10-22 Shallcross Mfg Company Apparatus for resistor film deposition
US2853969A (en) * 1953-06-10 1958-09-30 Erie Resistor Ltd Apparatus for producing electric resistors
US2958899A (en) * 1953-10-09 1960-11-08 Int Resistance Co Apparatus for deposition of solids from vapors
US2880120A (en) * 1954-05-04 1959-03-31 Sperry Rand Corp Method of manufacturing a microwave attenuator for travelling wave tube
US2810664A (en) * 1954-05-24 1957-10-22 Int Resistance Co Method for pyrolytic deposition of resistance films
US2778743A (en) * 1954-11-16 1957-01-22 Bell Telephone Labor Inc Method of making electrical carbonfilm resistors
US2791522A (en) * 1955-09-20 1957-05-07 Raytheon Mfg Co Insulated ceramic conductors
US2901381A (en) * 1956-10-12 1959-08-25 Bell Telephone Labor Inc Method of making electrical resistors
US3139396A (en) * 1962-06-28 1964-06-30 Bell Telephone Labor Inc Tin oxide resistors
US3390452A (en) * 1963-03-29 1968-07-02 Irc Inc Method of making an electrical resistor
US3307515A (en) * 1963-08-15 1967-03-07 Mallory & Co Inc P R Vapor deposition apparatus including tumbler
US4946370A (en) * 1985-03-20 1990-08-07 Sharp Kabushiki Kaisha Method for the production of carbon films having an oriented graphite structure
US5404837A (en) * 1985-03-20 1995-04-11 Sharp Kabushiki Kaisha Method for preparing a graphite intercalation compound having a metal or metal compounds inserted between adjacent graphite layers
US20080100837A1 (en) * 2002-01-24 2008-05-01 The General Hospital Corporation Apparatus and method for ranging and noise reduction of low coherence interferometry lci and optical coherence tomography oct signals by parallel detection of spectral bands
US20080097225A1 (en) * 2006-10-19 2008-04-24 The General Hospital Corporation Apparatus and method for obtaining and providing imaging information associated with at least one portion of a sample, and effecting such portion(s)
EP2750143A2 (en) 2012-12-27 2014-07-02 Zidkiyahu Simenhaus High voltage transmission line cable based on textile composite material
US9362024B2 (en) 2012-12-27 2016-06-07 Zidkiyahu Simenhaus High voltage transmission line cable based on textile composite material

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