US1859112A - Method of manufacturing electrical resistances - Google Patents

Method of manufacturing electrical resistances Download PDF

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Publication number
US1859112A
US1859112A US413167A US41316729A US1859112A US 1859112 A US1859112 A US 1859112A US 413167 A US413167 A US 413167A US 41316729 A US41316729 A US 41316729A US 1859112 A US1859112 A US 1859112A
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resistance
carrier
electrical resistances
manufacturing electrical
coating
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US413167A
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Silberstein Isidor
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
    • H01C17/24—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material
    • H01C17/245—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material by mechanical means, e.g. sand blasting, cutting, ultrasonic treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49099—Coating resistive material on a base

Definitions

  • my invention consists in first coating the resistance material initially applied to the carrier with a protective layer such as lacquer adapted to prevent injury to the resistance material by ClllPS or powder cut from the body of resistance material and the carrier.
  • a protective layer such as lacquer adapted to prevent injury to the resistance material by ClllPS or powder cut from the body of resistance material and the carrier.
  • Fig. 1 is an elevation partly in section showing a resistance
  • Fig. 2 is a diagrammatical elevation partly in section showing the apparatus for manu-v facturing the resistance.
  • the resistance illustrated in Fig. 1 comprises a,carrier 1 of insulating material such as ceramic material, a resistance strip 2 applied to the said carrier, a coating 3 of lacquer or other non-conductive material, and termithe resistance material.
  • the strip 2 of resistance material is bounded at both sides by grooves 4 cut into the carrier.
  • the resistance stri is in the form of a he ix laid around the cy indrical core 1.
  • the carrier 1 is first coated with the resistance material 2, which may be for example a material containing carbon, 1
  • the coated core is now exactly measured, and from the dimensions thus obtained the breadth and the pitch of the helical line 4 to be ground into the protective coating, the resistance material and the core are exactly calculated so as to obtain the desired resistance.
  • the blank thus prepared is placed on a lathe, and the termirials 10 of the carrier 1 are connected with a source ofelectric energy and an apparatus for measuring current intensities. Preterably I use an apparatus such asan ammeter the scale marks of which directly indicate resistances.
  • the-groove 4 is cut into the blank while observing the current intensity or resistance indicated by the ammeter, the grinding operation being interrupted when the desired resistance is obtained. Thus by measuring the resistance in the course of the grinding operation the desired resistance is obtained.
  • Fig. 2 I have shown an apparatus in the form of a lathe suitable for cutting the groove 4.
  • the blank to be ground has received the reference character 12, which blank is placed on the centers 5 of the lathe for being rotated thereby.
  • the said centers are engaged by brushes 6 disposed in a circuit including a source of electric energy 7 and an ammeter 8 or similar measuring instrument.
  • the centers 5 are insulated from the spindles of the lathe by means of insulating blocks 11.
  • a rotary grinding disk 9 is provided, which'i's mounted on a Suitable slide-rest 13' by means of which it is adapted to be shifted in the direction of the arrow :1: while rotating the blank.
  • ner described I coat the blank with a suitable insulating lacquer by means of which any excess of air or moisture to the resistance material is prevented and the previous insulation of the resistance material is reestablished.
  • the carrier 1 of ceramic or other insulatin material is first ground exactly to the desired diameter before applying the insulating and protective coatings thereto.
  • the herein described method of manufacturing electrical resistances which consists in applying a coating of'resistance material to a carrier of insulating material, applying thereto a protective coating, and thereafter cutting from the said layers portions so as to leave resistances of'the desired form.
  • the herein described method of manufacturing electrical resistances which consists in applying a coating of resistance material to a carrier of insulating -material, applying thereto a protective coating, and thereafter grinding from the said layers and the surface of the carrier portions so as to leave resistances of the dwired form.
  • the resistance material an into the carrier 'a helical groove of a shape suitable for leaving a coating of the desired resistance on the carrier.

Description

y 17, 1932- l. SILBERSTEIN 1,859,112
METHOD OF MANUFACTURING ELECTRICAL RESISTANCES .Filed Dec. 11, 1929 I ynyenlbr: .Zs'zcZor flzZZenSfezn nals 10 in the form of caps fixed to the ends of the carrier and electrically connected with Patented 11., 11, 1932 PATENT OFFICE I SIDOR. SILIBEBSTEIN, 0F iBERLIN, GERMANY mn'r'non or mnuracruzame nrncrmcannnsrsmncns Application filed December 11, 1929, Serial No. 413,167, and in Germany December 18, 1928.
-which exact resistances are produced, and
with this object in view my invention consists in first coating the resistance material initially applied to the carrier with a protective layer such as lacquer adapted to prevent injury to the resistance material by ClllPS or powder cut from the body of resistance material and the carrier. Other obj ects of the improvements will appear from the following description.
For the purpose of explaining the invention 'a' resistance and an apparatus suitable for manufacturing the same have been shown in the accompanying drawings, in which Fig. 1 is an elevation partly in section showing a resistance, and
Fig. 2 is a diagrammatical elevation partly in section showing the apparatus for manu-v facturing the resistance.
The resistance illustrated in Fig. 1 comprises a,carrier 1 of insulating material such as ceramic material, a resistance strip 2 applied to the said carrier, a coating 3 of lacquer or other non-conductive material, and termithe resistance material. The strip 2 of resistance material is bounded at both sides by grooves 4 cut into the carrier. In the example shown in Fi .1 the resistance stri is in the form of a he ix laid around the cy indrical core 1.
In the manufacture of the resistance I proceed as follows: The carrier 1 is first coated with the resistance material 2, which may be for example a material containing carbon, 1
as is known in the art. The coated core is now exactly measured, and from the dimensions thus obtained the breadth and the pitch of the helical line 4 to be ground into the protective coating, the resistance material and the core are exactly calculated so as to obtain the desired resistance. The blank thus prepared is placed on a lathe, and the termirials 10 of the carrier 1 are connected with a source ofelectric energy and an apparatus for measuring current intensities. Preterably I use an apparatus such asan ammeter the scale marks of which directly indicate resistances. Now the-groove 4 is cut into the blank while observing the current intensity or resistance indicated by the ammeter, the grinding operation being interrupted when the desired resistance is obtained. Thus by measuring the resistance in the course of the grinding operation the desired resistance is obtained.
In Fig. 2 I have shown an apparatus in the form of a lathe suitable for cutting the groove 4. In the said figure the blank to be ground has received the reference character 12, which blank is placed on the centers 5 of the lathe for being rotated thereby. The said centers are engaged by brushes 6 disposed in a circuit including a source of electric energy 7 and an ammeter 8 or similar measuring instrument. The centers 5 are insulated from the spindles of the lathe by means of insulating blocks 11. For grinding the helical groove on the blank a rotary grinding disk 9 is provided, which'i's mounted on a Suitable slide-rest 13' by means of which it is adapted to be shifted in the direction of the arrow :1: while rotating the blank. Thus a helical roove 4 of the desired pitch is cut through t e protective coating 3, the resistance material 2 nd into the core 1, while the ammeter 8* is observed, the operation bein interrupted when the ammeter. shows the esired' resistance.
By first coating the resistance material with a protectlve layerI am enabledto produce an exact cut of the resistance strip, the said resistance strip being held while grinding between the protective layer and the carrier, and any in ury' to the resistance material by chips cut from the ceramic material is made impossible.
After cutting the resistance in the man: ner described I coat the blank with a suitable insulating lacquer by means of which any excess of air or moisture to the resistance material is prevented and the previous insulation of the resistance material is reestablished.
In my improved method the waste caused by failure in the manufacture is reduced to a minimum, so that the manufacture is economical. g
In the preferred method the carrier 1 of ceramic or other insulatin material is first ground exactly to the desired diameter before applying the insulating and protective coatings thereto. By thus producing an exactly cylindrical blank thegrinding operation is made more satisfactory and more exact. 1
While in describingithe invention reference has been made to a resistance'strip in the form of a helix I wish it to be understood that my invention is not limited to the terial to a carrier of insulating material applying thereto a protective coating, and thereafter removing portions of the said coatings to sired form.
2. The herein described method of manufacturing electrical resistances, which consists in applying a coating of'resistance material to a carrier of insulating material, applying thereto a protective coating, and thereafter cutting from the said layers portions so as to leave resistances of'the desired form.
3. The herein described method of manufacturing electrical resistances, which consists in applying a coating of resistance material to a carrier of insulating -material, applying thereto a protective coating, and thereafter grinding from the said layers and the surface of the carrier portions so as to leave resistances of the dwired form.
4. The herein described method of manufacturing electrical resistances, which consists in applying a coating of resistance ma thereafter grinding through the produce the resistance in the deterial to a carrier of insulating material, applying thereto a protective coating, and
layer, the resistance material an into the carrier 'a helical groove of a shape suitable for leaving a coating of the desired resistance on the carrier.
Signed at Berlin, this 25th day of November, 1929. I
ISIDOR SILBERSTEIN.
rotective
US413167A 1928-12-18 1929-12-11 Method of manufacturing electrical resistances Expired - Lifetime US1859112A (en)

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DE333837X 1928-12-18

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635162A (en) * 1949-02-25 1953-04-14 Aerovox Corp Electrical resistance
US2741687A (en) * 1953-08-21 1956-04-10 Erie Resistor Corp Pyrolytic carbon resistors
US2792620A (en) * 1953-08-20 1957-05-21 Wilbur M Kohring Sealed resistors
US2803729A (en) * 1953-03-03 1957-08-20 Wilbur M Kohring Resistors
US2838427A (en) * 1956-10-23 1958-06-10 Int Resistance Co Method and apparatus for flame spiralling
US2843711A (en) * 1955-07-28 1958-07-15 Napier & Son Ltd Thermo-electric surface heaters
US3000079A (en) * 1955-05-05 1961-09-19 Aladdin Ind Inc Tuner and method for making same
US3095636A (en) * 1959-07-17 1963-07-02 John G Ruckelshaus Mass production of resistors
US3105288A (en) * 1959-02-27 1963-10-01 Western Electric Co Method of and apparatus for making deposited carbon resistors
US3162932A (en) * 1960-10-21 1964-12-29 Gen Precision Inc Process of making a hall crystal
US3165819A (en) * 1961-02-15 1965-01-19 Continental Wirt Electronic Method of producing carbon film resistors
US3216090A (en) * 1961-11-06 1965-11-09 Mitsubishi Electric Corp Process of producing solid composition resistors of monolithic structure
US3222504A (en) * 1961-06-23 1965-12-07 Western Electric Co Monitoring system for controlling a component fabricating machine
US3284878A (en) * 1963-12-09 1966-11-15 Corning Glass Works Method of forming thin film resistors
US3293587A (en) * 1965-10-20 1966-12-20 Sprague Electric Co Electrical resistor and the like
US3311968A (en) * 1962-06-02 1967-04-04 Ardouin Jean Jules Henri Methods of making electrical resistors
US3366777A (en) * 1967-01-16 1968-01-30 Kenneth W. Brittan Electrically heated window glazings
US3375342A (en) * 1963-03-04 1968-03-26 Sprague Electric Co Electron beam milling of electrical coatings
US3399300A (en) * 1964-04-10 1968-08-27 Pan American Petroleum Corp Computing device including an electrical delay line with a plurality of taps each connected to a potentiometric network which is controlled by a strip element
US4920635A (en) * 1986-05-07 1990-05-01 Ngk Insulators, Ltd. A method of manufacturing a thermo-sensitive resistor

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635162A (en) * 1949-02-25 1953-04-14 Aerovox Corp Electrical resistance
US2803729A (en) * 1953-03-03 1957-08-20 Wilbur M Kohring Resistors
US2792620A (en) * 1953-08-20 1957-05-21 Wilbur M Kohring Sealed resistors
US2741687A (en) * 1953-08-21 1956-04-10 Erie Resistor Corp Pyrolytic carbon resistors
US3000079A (en) * 1955-05-05 1961-09-19 Aladdin Ind Inc Tuner and method for making same
US2843711A (en) * 1955-07-28 1958-07-15 Napier & Son Ltd Thermo-electric surface heaters
US2838427A (en) * 1956-10-23 1958-06-10 Int Resistance Co Method and apparatus for flame spiralling
US3105288A (en) * 1959-02-27 1963-10-01 Western Electric Co Method of and apparatus for making deposited carbon resistors
US3095636A (en) * 1959-07-17 1963-07-02 John G Ruckelshaus Mass production of resistors
US3162932A (en) * 1960-10-21 1964-12-29 Gen Precision Inc Process of making a hall crystal
US3165819A (en) * 1961-02-15 1965-01-19 Continental Wirt Electronic Method of producing carbon film resistors
US3222504A (en) * 1961-06-23 1965-12-07 Western Electric Co Monitoring system for controlling a component fabricating machine
US3216090A (en) * 1961-11-06 1965-11-09 Mitsubishi Electric Corp Process of producing solid composition resistors of monolithic structure
US3311968A (en) * 1962-06-02 1967-04-04 Ardouin Jean Jules Henri Methods of making electrical resistors
US3375342A (en) * 1963-03-04 1968-03-26 Sprague Electric Co Electron beam milling of electrical coatings
US3284878A (en) * 1963-12-09 1966-11-15 Corning Glass Works Method of forming thin film resistors
US3399300A (en) * 1964-04-10 1968-08-27 Pan American Petroleum Corp Computing device including an electrical delay line with a plurality of taps each connected to a potentiometric network which is controlled by a strip element
US3293587A (en) * 1965-10-20 1966-12-20 Sprague Electric Co Electrical resistor and the like
US3366777A (en) * 1967-01-16 1968-01-30 Kenneth W. Brittan Electrically heated window glazings
US4920635A (en) * 1986-05-07 1990-05-01 Ngk Insulators, Ltd. A method of manufacturing a thermo-sensitive resistor

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GB333837A (en) 1930-08-21

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