US3729817A - Method of making rotatable element potentiometer - Google Patents

Method of making rotatable element potentiometer Download PDF

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Publication number
US3729817A
US3729817A US00182997A US3729817DA US3729817A US 3729817 A US3729817 A US 3729817A US 00182997 A US00182997 A US 00182997A US 3729817D A US3729817D A US 3729817DA US 3729817 A US3729817 A US 3729817A
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US
United States
Prior art keywords
strip
members
contact
portions
rotor
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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
US00182997A
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English (en)
Inventor
Rouen J De
K Baldwin
H Martin
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Bourns Inc
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Bourns Inc
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Publication date
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Publication of US3729817A publication Critical patent/US3729817A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/28—Apparatus or processes specially adapted for manufacturing resistors adapted for applying terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/005—Surface mountable, e.g. chip trimmer potentiometer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing 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
    • 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
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49792—Dividing through modified portion
    • 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
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49798—Dividing sequentially from leading end, e.g., by cutting or breaking
    • 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
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material

Definitions

  • a unique single-turn potentiometer of exceptionally low cost is produced by a unique process in which a flat strip of metal is advanced in step-by-step uniform advances through a series of die stations at each of which a respective one of successive die operations are performed and at the end of which operations are performed and at the end of which operations a potentiometer'housing body has been molded about portions of the strip and three potentiometer contacts, each integral with a respective terminal member, have been integrated with the body with the terminals protruding from the exterior of the body and the contacts from the interior.
  • the molded housing body at that stage remains secured to one edge portion of the strip by the three terminal members, which have yet to be severed from the strip.
  • a rotor comprising an insulative substrate of disc-like configuration bearing on its lower or interior face a resistance element, a return conductor or collector and terminal connection conductor means, is inserted into the body with a housing cover member and the cover member sealed to the body to retain the rotor and seal the interior of the housing.
  • the substantially completed potentiometers are thereafter severed one by one from the strip by shearing adjacent the ends of the terminals; and, if testing or inspection is desirable, such further optional operations are performed.
  • the terminal members may be bent to provide an alternative terminal configuration in which the terminals are disposed at an angle to the direction in which they extend from the body.
  • the rotor may alternatively be secured to a shaft, or may merely be provided with other means, such as a slot, to provide for its rotation by external means.
  • the internal contact members at least one of which preferably is sheared as noted to provide a plurality of resilient contacts, are so disposed in the housing body that as the rotor is placed in position in the body, the sets of contacts are each engaged and resiliently stressed by a respective one of the conductors or the resistive element.
  • the housing cover which has a central aperture into which the shaft or other externally accessible actuating portion of the rotor extends, is of conformation such as to confine the rotor to rotation about an axis and to a position assuring proper interengagement between the contacts and the elements on the inner face of the rotor.
  • the cover and body sections of the potentiometer housing are provided with complementary interengaging formations which aid in proper juxtapositioning and hermetically sealing of those two parts together and for cooperative action in restricting rotation of the rotor to a desired extent of rotational movement. Since mechanical production of all of the terminals and internal contacts and their fixation in the housing body proceeds by machine operations substantially without manual operations, it is evident that a large proportion of the cost of assembly of the potentiometer is eliminated, and a great improvement in uniformity of the product is attained. Further, since the resistance element and.
  • connections from the element and the return conductor are on the lower face of the rotor and are of cermet type, all manual operations relating to manufacture of the rotor and its element may be performed by automatic machinery, whereby to further decrease costs and to improve uniformity of the product.
  • Another object is to provide a potentiometer construction which eliminates much of the labor involved in assembly of the instrument, with concurrent reduction in cost and increase in uniformity of product.
  • Another object of the invention is to provide a potentiometer structure of simple construction adapted for automatic machine production.
  • An additional object of the invention is to provide a procedure for forming respective sets of potentiometer contacts with associated terminals as integral units of a single member of metal, forming potentiometer bodies about the member to provide a series of the latter with respective terminal sets and contact sets, whereby to reduce costs of manufacture and attain improvements in uniformity of the product.
  • FIG. 2 is a lower face view of the potentiometer rotor structure used with the body assembly shown in FIGS. la-ld, at one stage of manufacture;
  • FIG. 2a is a view similar to FIG. 2 but at a subsequent stage of manufacture of the rotor
  • FIG. 3 is a top face or plan view of the rotor structure shown in FIG. 2;
  • FIG. 4 is a side view of the rotor structure depicted in FIGS. 2 and 3;
  • FIGS is a view similar to FIG. 3 but showing a seal member installed
  • FIG. 6 is a pictorial view of the exemplary potentiometer housing cover, to somewhat enlarged scale
  • FIG. 7 is a bottom view of the cover shown in FIG. 6, to approximately the same scale;
  • FIG. 7a is a fragmentary sectional view, with the sectioning as indicated by directors 7a-7a in FIG. 7;
  • FIG. 8 is a pictorial view ,of a completed exemplary potentiometer manufactured according to the process or method of the invention.
  • the procedure according to the invention involves advancing of a strip of metal in measured steps while at each ofa plurality of work stations or locations the strip in punched in various ways, portions work-hardened,
  • FIGS. la, lb, and 1c shown a thin flat metal strip 20 which is advanced through a plurality of die-sets in step-by-step increments or unitlengths.
  • the die-set stations will be considered to be one unit-length of strip apart, center-to-center, whereas in actual practice the die-sets will generally be variously spaced along the strip 20.
  • a portion 26 adjacent one edge of the strip is thinned, as by milling or grinding, as indicated at the right in FIG. 1a.
  • the strip which is of annealed material, may be so supplied by the supplier.
  • the thinned portion 26 is provided for the formation of relatively thin contact fingers.
  • the die means operates to punch a pair of guide or registry holes 22, 22a, and to remove a rectangular portion of material at 24.
  • S2 which as previously noted may be spaced by a desirable distance mx from the first station (wherein m is a whole number and x is the center-tocenter distance between successive holes 22), additional punching is performed, as indicated at 25.
  • a perforation 28 is made, and at station S4 a perforation 30 is made.
  • a large portion of the thinned portion of the strip is removed, leaving a window or perforation 32 and a very narrow edge portion 32a which is readily deformable.
  • the strip is of annealed alloy, hence is relatively soft and easily punched, but is capable of work hardening.
  • trimming operations occur, to assure precise edges at desired locations, and the remainder of window 32 is produced.
  • the remaining finger-like portions of the thin portion 26 of the strip, denoted 34 in station S6, are work-hardened by swaging or hammering, with some lateral expansion of the portions as indicated.
  • the finger-like portions are to be formed into resilient contact members and hence they must be workhardened as noted to impart resilience to the material.
  • an elongate aperture 36 (here first shown at S7 in the interest of conservation of drawing space) is produced; and a second of such elongate apertures, 37, is subsequently produced as shown at S8.
  • trimming operations such as trimming of the margins of apertures 24 and as indicated at 57-88, are performed.
  • the edges of material of portions 34 are trimmed and edge portion 32a is removed.
  • a slitting or shearing operation is performed, producing a pair of slits 38-39 between apertures 28 and 30, thus producing a middle contact finger 40a of a set of three such fingers disposed for engagement with a resistance element.
  • aperture 28 is transformed, by removal of material at both ends, into a stepped slot opening into aperture 24, to leave outstanding a contact member 42 connected to the strip by a base portion 42b.
  • a similar operation removes material at both ends of aperture 30, leaving a central three-limbed contact member 40 comprising three fingers 40a, 40b and 400, and further leaving a third contact member 44.
  • the three contact members are trimmed at their outer ends, and at station S15 (FIG. 10), the ends of the members are cupped or dimpled to provide curved points or contacts at the extremities of the respective fingers 40a, 40b and 400 and at the extremities of members 42 and 44.
  • the outer ends of the three contact members 40, 42 and 44 are sharply bent at right angles to the general plane of the strip, so that they extend upwardly away from their respective bases.
  • strip material encircling aperture 22a is removed; and at the next station strip material at the other side of the group of fingers is removed.
  • the legs 46, 48 and 50 are dimensioned and spaced to form respective potentiometer terminal members.
  • the bridges 52 and 54 serve to precisely hold in proper spatial relationship the three contact members 40, 42 and 44 for the next step of the sequence of operations.
  • a potentiometer housing body 56 is molded about the base portions of the contact members, leaving the upstanding contact ends thereof protruding upwardly from the floor 56f of a circular cavity 560 formed in the body.
  • the up-, standing portions of the contact members are bent over in a direction away from the remaining base of strip 20 and into angular relationship with the floor of the cavity.
  • each of the contact members is integral with a respective one of the legs 46, 48 and 50, which are designed to become potentiometer terminals.
  • the interconnecting bridges 52 and 54 are punched or sheared out, leaving terminal members 46t, 481 and 50t supporting the housing body from the lower edge portion of strip 20 as shown at station S21;
  • a rotor 60 which is depicted in detail in FIGS.
  • FIGS. 6 and 7 a housing cover
  • the housing cover is disposed on the housing body and ultrasonic energy applied to seal the cover in place.
  • each of the latter operations or procedural steps may be performed at respective different stations, and the manufacture and assembly of the rotor may be effected offline in a ceramics process known in the trade, the two sets of operations occurring in procedures and sequences depending upon the arrangements of apparatus.
  • the potentiometer assembly is severed from the strip by severance of the three terminal members 46!, 48t and 50t between the body and the strip.
  • FIG. 2 there is depicted a rotor 60 of insulati've material such as fired alumina, on the lower face of which is fired or otherwise formed an outer conductive element 60a and an electrically separate inner conductive element 60b.
  • These conductive elements are positioned to engage contact points of members 42 and 44, respectively, and are functionally arranged to serve as rotor-borne slip-ring type terminations for the rotorcarried resistance element of the potentiometer.
  • the upper or outer face of, the rotor 60 is depicted in FIG. 3. It is of special form, including an upstanding circular formation 60f adapted to closely fit in and be guided by a central circular aperture 70a (FIG. 6) formed in the housing cover 70.
  • the upstanding circular formation may be extended into a shaft formation or may be short as illustrated, and forms an externally accessible means for rotating the rotor.
  • the upper face of the rotor also comprises a flat circular seat 60s (FIG. 3) on which an O-ring seal 62 (FIG. 5) is seated.
  • the O-ring bears against the inner surface of cover 70, encircling the aperture 70a and thus serving to seal the interior of the housing against ingress of foreign material.
  • the circular seat 60s' is extended radially outwardly to provide a stop member 60t (FIGS. 4 and 5) which is disposed to engage a complementary fixed stop abutment 70s (FIG. 7) formed on the inner wall of cover 70.
  • the rotor is adapted to be held with the base of the circular formation 60f confined in the circular aperture 70a of the cover with a step 60p (FIG. 3) of the upper face of the rotor bearing against the interior surface 70m (FIG. 7) of the cover, by upward pressure of shelf means 56s of housing body 56 against the lower face of the rotor. That upward force or pressure further slightly deforms the O-ring seal 62 to insure good sealing of the housing against ingress of foreign material.
  • the contacts of members 40, 42 and 44 are brought into contacting engagement with elements 60r. 60a 60b, respectively.
  • the housing cover 70 and its entrained rotor relative to the housing base 56 as the cover assembly is applied to the base is provided with a set of unsymmetri'cally disposed grooves 56p and 56q (FIG. lc, station 20), and cover 70 is formed with a complementary set of projections 70p and q (FIGS. 6, 7 and 8) which snugly seat in respective ones of the grooves.
  • the ends of the projections are beveled or rounded whereby to aid in proper placement and registry of the cover and base as the cover is brought into position on the base.
  • the cover is further provided with a sharp circular ridge 70r (FIG. 7) (which bears against a flat surface 56m (FIG.
  • the cover preferably also is provided with other such sharp ridge formations as indicated at 70w, 70x, 70y and 70z (FIG. 7). While not essential to the invention, provision of the additional ridge formations ensures excellent structural union of the housing cover and body members as the ultrasonic energy is applied.
  • annular portion 70z of the inner ceiling surface of cover 70, adjacent aperture 70a, is lowered into forceful contact with shelf 60p of the rotor; and under'the stress of the ultrasonic vibrations that annular ceiling surface becomes plastic and isbrought into exact conformity with the surface of the noted shelf.
  • the lower surface of the rotor is very firmly seated on the shelf 56s of body 56.
  • the terminal members 46t, 48! and SIM may be bent downwardly at right angles to their dispositions as shown in FIG. 8, whereby the potentiometer may be plugged into a circuit board or the like and disposed for operation from above, rather than from the side. Such bending can precede, or follow, severance of the potentiometer from the strip 20.
  • the strip may be passed through a plating bath between selected stations.
  • plating may be effected as the assembly moves away from the station at which bridges 52 and 54 are removed from between the terminals, or the entire strip may be plated prior to use. It is evident that the order in which certain steps of the described procedure are performed may be inverted or otherwise altered, without significantly changing the results accomplished. Also, it is evident that certain of the procedural steps may be combined into a single step.
  • a process for producing potentiometers comprising:

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Adjustable Resistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
US00182997A 1971-09-30 1971-09-23 Method of making rotatable element potentiometer Expired - Lifetime US3729817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18299771A 1971-09-30 1971-09-30

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US3729817A true US3729817A (en) 1973-05-01

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US00182997A Expired - Lifetime US3729817A (en) 1971-09-30 1971-09-23 Method of making rotatable element potentiometer

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US (1) US3729817A (enrdf_load_stackoverflow)
DE (1) DE2226317A1 (enrdf_load_stackoverflow)
FR (1) FR2153227B3 (enrdf_load_stackoverflow)
GB (1) GB1367839A (enrdf_load_stackoverflow)
NL (1) NL7206780A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869789A (en) * 1974-05-31 1975-03-11 Spectrol Electronics Corp Method of manufacturing variable resistance device
DE2500364A1 (de) 1974-01-14 1975-07-17 Littelfuse Inc Stecksicherung
JPS5093232U (enrdf_load_stackoverflow) * 1973-12-27 1975-08-06
US4040175A (en) * 1974-01-14 1977-08-09 Littelfuse, Inc. Method of making a miniature plug-in fuse with fragile fuse link
US4052786A (en) * 1974-07-01 1977-10-11 Cts Corporation Method of making a variable resistance control
US4056884A (en) * 1975-02-08 1977-11-08 Littelfuse, Inc. Method of making a miniature plug-in fuse
US4063206A (en) * 1976-08-16 1977-12-13 Walker Edgar Iii Tunable electrical component
US4188715A (en) * 1975-07-21 1980-02-19 Elfab Corporation Method of fabricating an insulator for an electrical connector
US4521761A (en) * 1984-02-17 1985-06-04 Sangamo Weston, Inc. Small outline potentiometer
FR2558311A1 (fr) * 1983-12-30 1985-07-19 Piher Navarra Sa Procede de fabrication d'elements metalliques de contacteurs pour des composants electroniques
US4860436A (en) * 1986-07-10 1989-08-29 501 Idec Izumi Corporation Method of manufacturing a compact switch
FR2634580A1 (fr) * 1988-07-14 1990-01-26 Compel Sa Procede, sequentiel et automatique, de fabrication de potentiometres et potentiometres obtenus par sa mise en oeuvre
EP0341181A3 (en) * 1988-03-21 1990-07-04 Aragonesa De Componentes Pasivos, S.A. Adjusting potentiometer for electronic circuits, process for assembling the elements thereof, and process for obtaining the resistive plate thereof
FR2663494A1 (fr) * 1990-06-15 1991-12-20 Bourns Inc Dispositif electronique a substrat et boitier pour plaquette a circuit imprime.
EP0600116A1 (de) * 1991-05-27 1994-06-08 M. KRAH ELEKTROTECHNISCHE FABRIK GmbH & CO. KG Befestigungsvorrichtung für elektrische Widerstände und Verfahren zu ihrer Herstellung
FR2704086A1 (fr) * 1993-04-14 1994-10-21 Nacesa Potentiomètre miniature et procédé automatique de fabrication de potentiomètres miniatures.
US5790012A (en) * 1995-05-29 1998-08-04 Murata Manufacturing Co., Ltd. Variable resistor
CN104103391A (zh) * 2014-08-01 2014-10-15 贵州凯里经济开发区中昊电子有限公司 采用立体金属带工艺生产热压敏电阻器的方法及其产品

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2167981A (en) * 1984-11-21 1986-06-11 Piher Navarra Sa Adjustable potentiometers
ES2063695B1 (es) * 1993-04-14 1997-12-01 Navarra Componentes Electro Potenciometro miniatura y procedimiento para su fabricacion.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173186A (en) * 1929-08-26 1939-09-19 White S Dental Mfg Co Method of producing electrical resistance units
US3374536A (en) * 1964-10-29 1968-03-26 Sprague Electric Co Incapsulation of electrical units
US3391426A (en) * 1965-10-22 1968-07-09 Motorola Inc Molding apparatus
US3402464A (en) * 1966-07-14 1968-09-24 Bourns Inc Method of making a potentiometer
US3436810A (en) * 1967-07-17 1969-04-08 Jade Corp Method of packaging integrated circuits
US3597837A (en) * 1968-11-12 1971-08-10 Litton Precision Prod Inc Method of making trimmer potentiometers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173186A (en) * 1929-08-26 1939-09-19 White S Dental Mfg Co Method of producing electrical resistance units
US3374536A (en) * 1964-10-29 1968-03-26 Sprague Electric Co Incapsulation of electrical units
US3391426A (en) * 1965-10-22 1968-07-09 Motorola Inc Molding apparatus
US3402464A (en) * 1966-07-14 1968-09-24 Bourns Inc Method of making a potentiometer
US3436810A (en) * 1967-07-17 1969-04-08 Jade Corp Method of packaging integrated circuits
US3597837A (en) * 1968-11-12 1971-08-10 Litton Precision Prod Inc Method of making trimmer potentiometers

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5093232U (enrdf_load_stackoverflow) * 1973-12-27 1975-08-06
DE2500364A1 (de) 1974-01-14 1975-07-17 Littelfuse Inc Stecksicherung
US4040175A (en) * 1974-01-14 1977-08-09 Littelfuse, Inc. Method of making a miniature plug-in fuse with fragile fuse link
DE2560126C2 (de) * 1974-01-14 1984-12-20 Littelfuse Inc., Des Plaines, Ill. Verfahren zum Herstellen einer elektrischen Miniatur-Stecksicherung
US3869789A (en) * 1974-05-31 1975-03-11 Spectrol Electronics Corp Method of manufacturing variable resistance device
US4052786A (en) * 1974-07-01 1977-10-11 Cts Corporation Method of making a variable resistance control
US4056884A (en) * 1975-02-08 1977-11-08 Littelfuse, Inc. Method of making a miniature plug-in fuse
US4188715A (en) * 1975-07-21 1980-02-19 Elfab Corporation Method of fabricating an insulator for an electrical connector
US4063206A (en) * 1976-08-16 1977-12-13 Walker Edgar Iii Tunable electrical component
FR2558311A1 (fr) * 1983-12-30 1985-07-19 Piher Navarra Sa Procede de fabrication d'elements metalliques de contacteurs pour des composants electroniques
US4521761A (en) * 1984-02-17 1985-06-04 Sangamo Weston, Inc. Small outline potentiometer
US4860436A (en) * 1986-07-10 1989-08-29 501 Idec Izumi Corporation Method of manufacturing a compact switch
EP0341181A3 (en) * 1988-03-21 1990-07-04 Aragonesa De Componentes Pasivos, S.A. Adjusting potentiometer for electronic circuits, process for assembling the elements thereof, and process for obtaining the resistive plate thereof
FR2634580A1 (fr) * 1988-07-14 1990-01-26 Compel Sa Procede, sequentiel et automatique, de fabrication de potentiometres et potentiometres obtenus par sa mise en oeuvre
NL8901831A (nl) * 1988-07-14 1990-02-01 Compel Sa Sequentiele en automatische werkwijze voor het vervaardigen van potentiometers, en door toepassing van de werkwijze verkregen potentiometers.
US4951378A (en) * 1988-07-14 1990-08-28 Compel, S.A. Process of automatic sequential production of potentiometers
FR2663494A1 (fr) * 1990-06-15 1991-12-20 Bourns Inc Dispositif electronique a substrat et boitier pour plaquette a circuit imprime.
EP0600116A1 (de) * 1991-05-27 1994-06-08 M. KRAH ELEKTROTECHNISCHE FABRIK GmbH & CO. KG Befestigungsvorrichtung für elektrische Widerstände und Verfahren zu ihrer Herstellung
FR2704086A1 (fr) * 1993-04-14 1994-10-21 Nacesa Potentiomètre miniature et procédé automatique de fabrication de potentiomètres miniatures.
US5790012A (en) * 1995-05-29 1998-08-04 Murata Manufacturing Co., Ltd. Variable resistor
CN104103391A (zh) * 2014-08-01 2014-10-15 贵州凯里经济开发区中昊电子有限公司 采用立体金属带工艺生产热压敏电阻器的方法及其产品
CN104103391B (zh) * 2014-08-01 2017-07-11 贵州凯里经济开发区中昊电子有限公司 采用立体金属带工艺生产热压敏电阻器的方法及其产品

Also Published As

Publication number Publication date
NL7206780A (enrdf_load_stackoverflow) 1973-03-27
FR2153227A1 (enrdf_load_stackoverflow) 1973-05-04
DE2226317A1 (de) 1973-04-12
GB1367839A (en) 1974-09-25
FR2153227B3 (enrdf_load_stackoverflow) 1975-08-08

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