US1889618A - Resistance unit - Google Patents

Resistance unit Download PDF

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Publication number
US1889618A
US1889618A US345457A US34545729A US1889618A US 1889618 A US1889618 A US 1889618A US 345457 A US345457 A US 345457A US 34545729 A US34545729 A US 34545729A US 1889618 A US1889618 A US 1889618A
Authority
US
United States
Prior art keywords
resistance
unit
carbon
conductor
terminals
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
Application number
US345457A
Other languages
English (en)
Inventor
Dow O Whelan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US345457A priority Critical patent/US1889618A/en
Priority to NL29182D priority patent/NL29182C/xx
Priority to FR691431D priority patent/FR691431A/fr
Priority to DE1930567939D priority patent/DE567939C/de
Priority to GB7747/30A priority patent/GB343342A/en
Application granted granted Critical
Publication of US1889618A publication Critical patent/US1889618A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/148—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals embracing or surrounding the resistive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/001—Mass resistors
    • 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
    • Y10T29/49101—Applying terminal

Definitions

  • My invention relates to resistance units and the like, and has for its object the pro-vision of a simple and eflicient method and means for making a resistance unit whereby a sturdy, compact and durable resistance unit is pro-' vided.
  • my invention is particularly useful in connection with resistance units of relatively high resistance and low current-carrying capacity for use in radio and like circuits.
  • I embed the terminal members in a suitable resistance medium so that they will be rigidly supported by the resistance medium itself.
  • I employ a moulded carbon compound as the resistance medium and embed the terminal members. during the moulding operation.
  • Fig. 3 is a bottom plan of the finished resistance unit.
  • the resistance unit in finished form comprises a substantially cylindrical moulded carbon resi tance body portion 10, a plurality of longitudinally spaced contact terminals 11 and a pair of end terminals 12, one of which will be provided for each end ofthe resistance unit.
  • the resistance body is moulded or otherwise formed as a unit in any desired shape
  • a suitable electrical conductor 13 formed substantially as a helix (Fig. l), in the mould in which the carbon portion; body 10 is to be formed.
  • the longitudinal axis of the helix will be shaped in conformity with the longitudinal axis of the form to be assumed by the moulded body portion and preferably will coincide with this axis.
  • any suitable electrical conductor may any other suitable arrangement of the conductor ends may be used.
  • carbon preferably in the form of flakes, together with some suitable binding material will 'be packed into the mould in and about all of the turns of the helix, it.
  • the mould will be of such proportions that the finished unit will have a diameter slightly larger than that of the helix. Moreover, the finished unit preferably will be of such length that the inturned ends of the helix, i. e., the end terminals 12 will be exposed. Thus as shown, the inner surfaces of the terminals 12 will be substantially flush with the end surfaces of the unit. It will be understood, however, that this is not a necessary arrangement since the ends of the conductor may be embedded in the moulded unit.
  • any suitable binding material may be used, I prefer to use a hydro-carbon binder such as coal tar, coal tar pitch, etc. It will be understood that the binder will be of sufiicient content to give the desired mechanical strength. Thus, the binder should be added in such proportions that substantially all the carbon flakes will be coated with the binding material.
  • the unit is heated under pressure so as to drive off the volatile constituents of the binding material and to compact the structure of the unit.
  • the unit will be heated to a temperature high enough to cause practically complete carbonization of the binding material.
  • the temperature to which the unit is heated and the duration of the heating period will be determined by the resistance required, the size of the unit, the proportion of binding material used and the conducting material from which the helix is formed.
  • the pressure to be applied will vary with the particular unit being treated. Preferably, however, the pressure will be high enough to press the carbon to a compact, homogeneous mass.
  • the unit After. the heat and pressure treatment, the unit will be removed from the mould and the carbon on one side of the unit will be removed in any suitable manner so as to expose a portion of each conductor turn, as shown in Figs. 2 and 3.
  • a longitudinal strip 14 of the carbon throughout the entire length suitable rotary wire brush. It will be understood that the exposed portion of each turn will serve as a contact terminal member for which any suitable contact arm (not shown) or soldered connection may be provided.
  • the turns of the helix will be separated from each other by the removal of a portion of each turn. This may be effected conveniently by milling a, longitudinal slot 15 of a depth suflicient to sever the conductor turns. It will be observed that after the slot 15 has been milled, each turn will be shaped substantially as a broken ring, practically the entire length of which will be embedded in the carbon body.
  • the resistance unit in finished form comprises a resistance body portion having contact terminals spaced longitudinally thereof and a terminal in each end all of which terminals will be securely anchored to the resistance body.
  • the resistance unit may conveniently be used as a potentiometer in which the two end terminals will be employed together with the spaced terminals or it may be used as a rheostat in which all or any desired number of the terminals may be employed.
  • the resistance between each terminal may be determined by the spacing of the turns of the helix and by the amount of carbon brushed away in the operation of exposing the turns. Thus, if the turns are spaced closer together, the resistance between turns will be lessened; likewise, if more of the carbon is brushed away this resistance will be increased. 4
  • the unit will not deteriorate under the influence of atmospheric moisture, vapors of wax, certain oils, paraflins, etc., nor will the terminals be loosened either under the action of atmospheric moisture or under the action of ordinary me'chanicalshocks or strains.
  • the helix may be positioned eccentrically within the mould so that after the carbon has been moulded a portion of each turn will be exposed without the brushing operation. Of course, the turns will be separated by the millingorsome other like operation in finishing the unit.
  • a resistance unit or the like comprising a helical electrical conductor and a body of electrical resistance material embedding said conductor so as to leave a portion of each of a plurality of the convolutions of said conductor exposed for connection with an electric circuit, said body being provided with a longitudinally extending slot intersecting said convolutions, each of said convolutions terminating with the side walls of said slot.
  • the method of making a resistance unit or the like which comprises completely embedding a substantially helical electrical conductor in a moulded resistance medium so as to forma bar with said helical conductor embedded therein arranged lengthwise of the bar cutting through said medium lengthwise of said bar so as tosever each turn of said conductor and then cutting away said resistance medium to expose a portion of each turn so that each turn functions as a terminal member.
  • a resistance unit or the like which consists in providing a substantially helical electrical conductor, completely embedding said helical conductor in a mixture of carbon and h drocarbon binding material, moulding said elical conductor in said mixture of carbon and hydrocarbon binding material, heating to drive off the volatile constituents of said hydro-can bon binding material While applying pressure to compact the carbon into a homogeneous mass with said conductor embedded therein forming a slot in said mass so as to sever each turn of said conductor and then cutting away the resistance medium to expose a portion of each turn whereby each turn functions as a terminal member.
  • a resistance unit or the like which consists in providing a substantially helical electrical conductor, embedding said helical conductor in a bar of carbon composition so that the ends of said conductor project from the ends of said bar to rovide end. terminal members therefor, mil ing a slot lengthwise of said bar so as to sever each turn of said helical conductor and then brushing the carbon composition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Adjustable Resistors (AREA)
US345457A 1929-03-08 1929-03-08 Resistance unit Expired - Lifetime US1889618A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US345457A US1889618A (en) 1929-03-08 1929-03-08 Resistance unit
NL29182D NL29182C (enrdf_load_stackoverflow) 1929-03-08 1930-03-07
FR691431D FR691431A (fr) 1929-03-08 1930-03-07 Résistances électriques
DE1930567939D DE567939C (de) 1929-03-08 1930-03-09 Elektrischer Widerstand, bei dem die Anschlussteile in das Element aus Widerstandsmaterial eingebettet sind, und Verfahren zu seiner Herstellung
GB7747/30A GB343342A (en) 1929-03-08 1930-03-10 Improvements in and relating to resistance units and methods of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US345457A US1889618A (en) 1929-03-08 1929-03-08 Resistance unit

Publications (1)

Publication Number Publication Date
US1889618A true US1889618A (en) 1932-11-29

Family

ID=23355130

Family Applications (1)

Application Number Title Priority Date Filing Date
US345457A Expired - Lifetime US1889618A (en) 1929-03-08 1929-03-08 Resistance unit

Country Status (5)

Country Link
US (1) US1889618A (enrdf_load_stackoverflow)
DE (1) DE567939C (enrdf_load_stackoverflow)
FR (1) FR691431A (enrdf_load_stackoverflow)
GB (1) GB343342A (enrdf_load_stackoverflow)
NL (1) NL29182C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064335A (en) * 1959-02-24 1962-11-20 Carrier Corp Method of manufacturing variable resistors
US4142022A (en) * 1976-04-05 1979-02-27 Brunswick Corporation Ceramic-metal laminate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064335A (en) * 1959-02-24 1962-11-20 Carrier Corp Method of manufacturing variable resistors
US4142022A (en) * 1976-04-05 1979-02-27 Brunswick Corporation Ceramic-metal laminate

Also Published As

Publication number Publication date
DE567939C (de) 1933-01-13
NL29182C (enrdf_load_stackoverflow) 1933-03-15
FR691431A (fr) 1930-10-21
GB343342A (en) 1931-02-19

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