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US3054082A - Impedance mounting device - Google Patents

Impedance mounting device Download PDF

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Publication number
US3054082A
US3054082A US781238A US78123858A US3054082A US 3054082 A US3054082 A US 3054082A US 781238 A US781238 A US 781238A US 78123858 A US78123858 A US 78123858A US 3054082 A US3054082 A US 3054082A
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US
United States
Prior art keywords
terminal
collar
terminals
leg
aperture
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Expired - Lifetime
Application number
US781238A
Inventor
Warren H West
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Cambridge Thermionic Corp
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Cambridge Thermionic Corp
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Filing date
Publication date
Application filed by Cambridge Thermionic Corp filed Critical Cambridge Thermionic Corp
Priority to US781238A priority Critical patent/US3054082A/en
Priority to GB19507/59A priority patent/GB898998A/en
Application granted granted Critical
Publication of US3054082A publication Critical patent/US3054082A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/01—Mounting; Supporting
    • H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections
    • 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

Definitions

  • the field of this invention is that of impedance mounting devices, and relates, more particularly, to coil mounting devices for use in conjunction with printed circuits.
  • Objects of this invention are to provide an impedance mounting device which is simple and compact, Which can be conveniently and inexpensively constructed, which is reliable in use, and which is particularly adapted for use in conjunction with printed circuits.
  • impedance mounting devices comprise a tubular body for supporting impedance means, one or more collars mounted on the body, each collar having a portion extending transversely of the body for receiving terminal means, and
  • each terminal made from angular blanks mounted on respective collar extensions, each terminal being bent around a collar extension so that one leg of the blank extends transversely of and away from the body, which leg is adapted for connecting the device in an electrical circuit, whereas the inner portion of the other leg of the blank is wrapped around the collar extension for attaching the terminal to the collar, so that the end of this other leg extends transversely of the body and of the rst leg, the said leg end being adapted for connection to the impedance means.
  • the collar extension is notched intermediate its length.
  • the terminal is wrapped around the collar extension at the notch and is thereby located and held on the collar extension.
  • the collar has the form of a plate having a portion extending transversely of the tubular body, this extending portion being apertured for receiving terminal means.
  • two terminals made from identical angular blanks are inserted within the collar aperture and bent so that one leg of each blank extends transversely of and away from the body ⁇ and parallel to the corresponding leg of the other terminal blank, vboth legs being adapted for connecting the device in ⁇ an electrical circuit, so that the iuner portion of the other leg of each terminal blank is folded completely around opposite marginal portions of the collar between the aperture and the collar extension periphery for attaching the terminals to the collar, and so that the end of the other leg of each blank extends transversely of the body and of the rst leg of said blank and oppositely of the corresponding leg of the other terminal blank, the leg ends ⁇ being adapted for connection to the impedance means.
  • FIG. 1 is a side elevation of the impedance mounting device of the invention
  • FIG. 2 is an end elevation of the device of FIG. 1;
  • FIG. 3 is a section along line 3 3 of FIG. 2;
  • FIG. 4 is lan end elevation of the collar of this invention.
  • FIG. 5. is an end elevation of another embodiment of the collar.
  • FIG. 6 is an isometric view of the terminals of the invention as they appear before attachment to the collar.
  • FIG. 7 is an isometric view of the terminals of FIG. 6 as they appear after attachment to the collar.
  • 1 indicates the impedance mounting device of this invention, here illustrated as a horizontal coil form adapted for use with a printed circuit.
  • the printed circuit panel is represented by the dotted lines 2.
  • the coil lform comprises ⁇ a cylindrical tube 3, preferably of ceramic material, having the axial, internally threaded bore 4, and having the externally threaded core 6 engaged therewith. Adjustment of the core within the bore 4 varies the impedance effected by the inductance coil 7 which is wound upon the tube 3.
  • the electrical construction of the impedance means is not part of the present invention and that other impedance affecting devices can be used within the scope of this invention.
  • the core 6 may be omitted to provide an inductance coil 7 which is not variable or the coil 7 may be primarily of resistive effect.
  • a collar 8 of insulating material such as Fiberglas is mounted adjacent each end of the coil form by means of the aperture 9 and the adhesive 11.
  • An epoxy resin is considered a suitable adhesive for this purpose.
  • the collar 8, as shown in FIG. 4, may comprise a plate having a circular portion 12 containing the aperture 9 and a lsubstantially rectilinear terminal extension 13 containing the aperture 14.
  • apertures 9 and 14 each preferably has a completely closed periphery it should be understood that either might be broken at some point and remain within the contemplation of the present invention.
  • Identical dat angular terminal blanks 16 having the legs 17 and 1S, as illustrated in FIGS. 6 ⁇ and 7, are used according to this invention, the inner portion of the leg 1S of each blank being bent into a U-shaped configuration, preferably before the terminal blanks are associated with the collars 3.
  • bending of the legs 18 of identical blanks 16 in opposite directions provides right-hand and left-hand terminals 19 and 21 respectively, which are otherwise identical.
  • the legs 1S of a right-hand and left-hand terminal can be inserted into each collar aperture 14, the dotted lines 22 in FIG. 3 indicating the legs 18 as inserted, and bent outwardly, as indicated by the arrows Z3 in FIG. 3, to clamp the marginal portions 24 and 26 respectively, of the collar extension 13.
  • a perspective View of ⁇ a pair of the terminals 19 and 21, as bent to clamp the marginal portions 24 and 26 respectively, is shown in FIG. 7, the terminals being shown removed from the collar 8.
  • the legs 17 and 18 of the terminals 19 and 21 may be notched, as at Z7, for facilitating electrical connection thereto.
  • the terminals are constructed of suitably conductive material such as aluminum or brass and may be plated with a solder metal for further facilitating electrical connection thereto.
  • the legs 17 of the terminals 19 and 21 extend transversely and away from the tubular body 3 for convenient connection to the printed circuit board 2.
  • the legs 17 can be inserted into apertures as at 28, in the printed circuit board and can also be bent over and soldered to the printed circuit if desired.
  • the coil mounting device of this invention can be conveniently, rapidly and inexpensively assembled from inexpensive component parts, that the device as assembled is compact and simple, that the terminals 19 and 21 can be easily replaced with longer or shorter terminals as desired, and that the device can be provided with a plurality of terminals without fear of shorting occurring between the terminals.
  • the faces 29 of the collar apertures 14 are preferably parallel to the peripheral edges 31 of the extensions 13, and are preferably of a length L only slightly larger than the width w of the terminal blank. legs 18, whereby the faces 32 of the apertures 14 conveniently and securely locate and hold the terminals 19 and 21.
  • FIG. illustrates an alternative embodiment of the collar of this invention showing the collar 8.1 comprising the circular portion 12.1 containing the aperture 9.1 and the terminal extensions 214.1 and 26.1.
  • the faces 33 of the extensions 24.1 and 26:1 extend transversely of the aperture 9.1 and are notched, as at 34, for receiving the terminals 19 and 21, the faces 36 of the notches serving to locate and hold said terminals on the extensions.
  • the faces '30.1 and 30.2 of the collar extensions 24.1 and 26.1 serve to support the impedance device 1 above the printed circuit panel 2.
  • a coil-mounting device comprising a tubular body for supporting a coil; a pair of collars one of which is mounted on the body adjacent each end of the body, each of said collars having a portion extending transversely of the body and having an aperture for receiving terminals; a left-hand terminal extending through the aperture in one of said collars, said terminal having a portion abutting the side of said aperture, an end portion extending from the aperture along one side of the collar transversely of the body, and another end portion extending from the aperture along the opposite side of said collar transversely of the body, said other end portion further extending along the peripheral edge of the collar for attaching the terminal to said collar, and said other end portion further extending transversely of the body and saidfnst end portion; a right-hand terminal extend- ⁇ ing through the aperture in said collar and having a portion abutting the side of said aperture opposite said left-hand terminal, said right-hand terminal being a mirror image of said left-handrterminal; and a pair of terminals
  • An impedance mounting device comprising -a tubular body for supporting limpedance means; a collar mounted on the body adjacent either end thereof, each of said collars having a terminal portion with an aperture therein for receiving terminals, extending transversely of the body; and four terminals, Veach having identical legs, mounted in pairs within said collar apertures, each Vof/said terminals having one leg extending transversely of and away from the body parallel to the corresponing legs of the other terminal, said legs being adapted for .connection in an electrical circuit, each of said terminals having the inner portion of the other legs of each terminal extending around a marginal portion of Vits respective collar between the terminal aperture and the collar periphery for attaching the terminals to the collars, theY end of the other leg of each terminal extending transversely of the body and of its iirst leg and oppositely of the corresponding leg of the other terminal in its pair, said leg ends being adapted for connection to said impedance means.
  • a coil-mounting device comprising a tubular body for supporting a coil; a collar mounted on the body adjacent an endV of the body, said collar having a portion extending transversely of the body and having an aperture for receiving terminals; a left-hand terminal extending through said aperture, said terminal having a portion abutting the side of said aperture, an end portion extending from the aperture along one side of the collar transversely of the body, and another end portion extending from the aperture along the opposite side of said collar transversely of the body, said other end portion further extending along the peripheral edge of the collar for attaching the terminal to said collar, and said other end portion further extending transversely of the body and said first end portion; and a right-hand terminal extending through said aperture and having a portion abutting the side of said aperture opposite said left-hand terminal, said right-hand terminal being a mirror image of said left-hand terminal.
  • An impedance mounting device comprising a tubular body for supporting impedance means; a collar mounted on th body adjacent an end thereof, said collar having a terminal portion with an aperture therein for receiving terminals, extending transversely of the body; and two terminals each having identical legs mounted within said collar aperture, said terminals having one leg extending transversely of and away from the body parallelV to the corresponding legs of the other terminal, said legs being adapted for connection in an electrical circuit, each of said terminals having the inner portion of the other leg of each terminal extending around a marginal portion of its respective collar between the terminal aperture and the collar periphery for attaching the terminals to the collars, the end of the other leg of each terminal extending transversely of the body and of its first leg and oppositely of the corresponding leg of the other terminal, said leg ends being adapted for connection to said impedance means.
  • An electrical impedance device comprising: a tubular body for mounting impedance means; a collar mounted adjacent one end -of the tubular body and having a transversely projecting terminal portion, said terminal portion having at least one substantially radial side edge; and a terminal including a pair of angularly disposed integral legs each joined to the other at one end, the terminal being mounted on said terminal portion such that one leg of the terminal abuts the radial side edge and extends transversely of and away from the body and the other leg extends around the terminal portion thereby to hold the terminal in place, said other leg projecting from its extension around said terminal portion away from the tubular body in a direction transverse of both the length of the tubular body and the length of said one leg.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Multi-Conductor Connections (AREA)

Description

Sept. 1l, 1962 W. H. WEST IMPEDANCE MOUNTING DEVICE tts The field of this invention is that of impedance mounting devices, and relates, more particularly, to coil mounting devices for use in conjunction with printed circuits.
Objects of this invention are to provide an impedance mounting device which is simple and compact, Which can be conveniently and inexpensively constructed, which is reliable in use, and which is particularly adapted for use in conjunction with printed circuits.
In brief summary, impedance mounting devices according to the invention comprise a tubular body for supporting impedance means, one or more collars mounted on the body, each collar having a portion extending transversely of the body for receiving terminal means, and
one or more terminals made from angular blanks mounted on respective collar extensions, each terminal being bent around a collar extension so that one leg of the blank extends transversely of and away from the body, which leg is adapted for connecting the device in an electrical circuit, whereas the inner portion of the other leg of the blank is wrapped around the collar extension for attaching the terminal to the collar, so that the end of this other leg extends transversely of the body and of the rst leg, the said leg end being adapted for connection to the impedance means.
In -a more specic aspect, the collar extension is notched intermediate its length. The terminal is wrapped around the collar extension at the notch and is thereby located and held on the collar extension.
In another aspect of this invention, the collar has the form of a plate having a portion extending transversely of the tubular body, this extending portion being apertured for receiving terminal means. In this embodiment, two terminals made from identical angular blanks are inserted within the collar aperture and bent so that one leg of each blank extends transversely of and away from the body `and parallel to the corresponding leg of the other terminal blank, vboth legs being adapted for connecting the device in `an electrical circuit, so that the iuner portion of the other leg of each terminal blank is folded completely around opposite marginal portions of the collar between the aperture and the collar extension periphery for attaching the terminals to the collar, and so that the end of the other leg of each blank extends transversely of the body and of the rst leg of said blank and oppositely of the corresponding leg of the other terminal blank, the leg ends `being adapted for connection to the impedance means.
These and other objects, aspects of novelty, and advantages of the invention will appear from the following description of a specific embodiment thereof.
The description refers to a drawing in which:
FIG. 1 is a side elevation of the impedance mounting device of the invention;
FIG. 2 is an end elevation of the device of FIG. 1;
FIG. 3 is a section along line 3 3 of FIG. 2;
FIG. 4 is lan end elevation of the collar of this invention;
FIG. 5. is an end elevation of another embodiment of the collar;
FIG. 6 is an isometric view of the terminals of the invention as they appear before attachment to the collar; and
3,54,98Z Patented Sept. 11, 1962 FIG. 7 is an isometric view of the terminals of FIG. 6 as they appear after attachment to the collar.
Referring to the drawings, 1 indicates the impedance mounting device of this invention, here illustrated as a horizontal coil form adapted for use with a printed circuit. The printed circuit panel is represented by the dotted lines 2. The coil lform comprises `a cylindrical tube 3, preferably of ceramic material, having the axial, internally threaded bore 4, and having the externally threaded core 6 engaged therewith. Adjustment of the core within the bore 4 varies the impedance effected by the inductance coil 7 which is wound upon the tube 3. It should be understood the electrical construction of the impedance means is not part of the present invention and that other impedance affecting devices can be used within the scope of this invention. Thus the core 6 may be omitted to provide an inductance coil 7 which is not variable or the coil 7 may be primarily of resistive effect.
A collar 8 of insulating material such as Fiberglas is mounted adjacent each end of the coil form by means of the aperture 9 and the adhesive 11. An epoxy resin is considered a suitable adhesive for this purpose. The collar 8, as shown in FIG. 4, may comprise a plate having a circular portion 12 containing the aperture 9 and a lsubstantially rectilinear terminal extension 13 containing the aperture 14.
Though the apertures 9 and 14 each preferably has a completely closed periphery it should be understood that either might be broken at some point and remain within the contemplation of the present invention.
Identical dat angular terminal blanks 16 having the legs 17 and 1S, as illustrated in FIGS. 6 `and 7, are used according to this invention, the inner portion of the leg 1S of each blank being bent into a U-shaped configuration, preferably before the terminal blanks are associated with the collars 3. As `shown in `FIG. 6, bending of the legs 18 of identical blanks 16 in opposite directions provides right-hand and left- hand terminals 19 and 21 respectively, which are otherwise identical. The legs 1S of a right-hand and left-hand terminal can be inserted into each collar aperture 14, the dotted lines 22 in FIG. 3 indicating the legs 18 as inserted, and bent outwardly, as indicated by the arrows Z3 in FIG. 3, to clamp the marginal portions 24 and 26 respectively, of the collar extension 13. A perspective View of `a pair of the terminals 19 and 21, as bent to clamp the marginal portions 24 and 26 respectively, is shown in FIG. 7, the terminals being shown removed from the collar 8.
The legs 17 and 18 of the terminals 19 and 21 may be notched, as at Z7, for facilitating electrical connection thereto. The terminals are constructed of suitably conductive material such as aluminum or brass and may be plated with a solder metal for further facilitating electrical connection thereto.
As Will be noted in FIG. l, the legs 17 of the terminals 19 and 21 extend transversely and away from the tubular body 3 for convenient connection to the printed circuit board 2. The legs 17 can be inserted into apertures as at 28, in the printed circuit board and can also be bent over and soldered to the printed circuit if desired. .T-he faces 30 of the collars `8, as shown in FIG. l, rest directly upon the printed circuit panel 2 thereby supporting the coil form 1 a proper distance above the panel. 'I'he to the collars 8 for supplementing the clamp effect of the i bent terminal legs 18. llt will also be noted that the coil mounting device of this invention can be conveniently, rapidly and inexpensively assembled from inexpensive component parts, that the device as assembled is compact and simple, that the terminals 19 and 21 can be easily replaced with longer or shorter terminals as desired, and that the device can be provided with a plurality of terminals without fear of shorting occurring between the terminals.
The faces 29 of the collar apertures 14 are preferably parallel to the peripheral edges 31 of the extensions 13, and are preferably of a length L only slightly larger than the width w of the terminal blank. legs 18, whereby the faces 32 of the apertures 14 conveniently and securely locate and hold the terminals 19 and 21.
FIG. illustrates an alternative embodiment of the collar of this invention showing the collar 8.1 comprising the circular portion 12.1 containing the aperture 9.1 and the terminal extensions 214.1 and 26.1. The faces 33 of the extensions 24.1 and 26:1 extend transversely of the aperture 9.1 and are notched, as at 34, for receiving the terminals 19 and 21, the faces 36 of the notches serving to locate and hold said terminals on the extensions. The faces '30.1 and 30.2 of the collar extensions 24.1 and 26.1 serve to support the impedance device 1 above the printed circuit panel 2.
It should be understood that although particular embodiments of the impedance supporting device of this invention have been shown by way of illustration, this invention includes all modifications and equivalents which fall within the scope of the appended claims.
1. A coil-mounting device comprising a tubular body for supporting a coil; a pair of collars one of which is mounted on the body adjacent each end of the body, each of said collars having a portion extending transversely of the body and having an aperture for receiving terminals; a left-hand terminal extending through the aperture in one of said collars, said terminal having a portion abutting the side of said aperture, an end portion extending from the aperture along one side of the collar transversely of the body, and another end portion extending from the aperture along the opposite side of said collar transversely of the body, said other end portion further extending along the peripheral edge of the collar for attaching the terminal to said collar, and said other end portion further extending transversely of the body and saidfnst end portion; a right-hand terminal extend- `ing through the aperture in said collar and having a portion abutting the side of said aperture opposite said left-hand terminal, said right-hand terminal being a mirror image of said left-handrterminal; and a pair of terminals extending through the aperture in the other of said collars, said pair of terminals being a mirror image of the terminal pair comprising said left-hand and righthand terminals. K
2.V An impedance mounting device comprising -a tubular body for supporting limpedance means; a collar mounted on the body adjacent either end thereof, each of said collars having a terminal portion with an aperture therein for receiving terminals, extending transversely of the body; and four terminals, Veach having identical legs, mounted in pairs within said collar apertures, each Vof/said terminals having one leg extending transversely of and away from the body parallel to the corresponing legs of the other terminal, said legs being adapted for .connection in an electrical circuit, each of said terminals having the inner portion of the other legs of each terminal extending around a marginal portion of Vits respective collar between the terminal aperture and the collar periphery for attaching the terminals to the collars, theY end of the other leg of each terminal extending transversely of the body and of its iirst leg and oppositely of the corresponding leg of the other terminal in its pair, said leg ends being adapted for connection to said impedance means.
3. A coil-mounting device comprising a tubular body for supporting a coil; a collar mounted on the body adjacent an endV of the body, said collar having a portion extending transversely of the body and having an aperture for receiving terminals; a left-hand terminal extending through said aperture, said terminal having a portion abutting the side of said aperture, an end portion extending from the aperture along one side of the collar transversely of the body, and another end portion extending from the aperture along the opposite side of said collar transversely of the body, said other end portion further extending along the peripheral edge of the collar for attaching the terminal to said collar, and said other end portion further extending transversely of the body and said first end portion; and a right-hand terminal extending through said aperture and having a portion abutting the side of said aperture opposite said left-hand terminal, said right-hand terminal being a mirror image of said left-hand terminal.
4. An impedance mounting device comprising a tubular body for supporting impedance means; a collar mounted on th body adjacent an end thereof, said collar having a terminal portion with an aperture therein for receiving terminals, extending transversely of the body; and two terminals each having identical legs mounted within said collar aperture, said terminals having one leg extending transversely of and away from the body parallelV to the corresponding legs of the other terminal, said legs being adapted for connection in an electrical circuit, each of said terminals having the inner portion of the other leg of each terminal extending around a marginal portion of its respective collar between the terminal aperture and the collar periphery for attaching the terminals to the collars, the end of the other leg of each terminal extending transversely of the body and of its first leg and oppositely of the corresponding leg of the other terminal, said leg ends being adapted for connection to said impedance means.
5. An electrical impedance device comprising: a tubular body for mounting impedance means; a collar mounted adjacent one end -of the tubular body and having a transversely projecting terminal portion, said terminal portion having at least one substantially radial side edge; and a terminal including a pair of angularly disposed integral legs each joined to the other at one end, the terminal being mounted on said terminal portion such that one leg of the terminal abuts the radial side edge and extends transversely of and away from the body and the other leg extends around the terminal portion thereby to hold the terminal in place, said other leg projecting from its extension around said terminal portion away from the tubular body in a direction transverse of both the length of the tubular body and the length of said one leg.
References Cited in the file of this patent UNITED STATES PATENTS 1,100,973 France Apr. 13,
w-un...
US781238A 1958-12-18 1958-12-18 Impedance mounting device Expired - Lifetime US3054082A (en)

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US781238A US3054082A (en) 1958-12-18 1958-12-18 Impedance mounting device
GB19507/59A GB898998A (en) 1958-12-18 1959-06-08 Improvements in or relating to electrical impedance devices and mountings therefor

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405379A (en) * 1966-10-24 1968-10-08 American Mach & Foundry Terminal arrangement for coil bobbin
JP2522042B2 (en) * 1989-04-24 1996-08-07 富士電機株式会社 Terminal device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1163904A (en) * 1914-12-07 1915-12-14 Western Electric Co Terminal mounting for metallic spools.
AU929432A (en) * 1932-09-20 1933-09-28 Sox LIV Corn Mitchell Arthur William Baker Improvements in inductance coil formers andthe like especially those for radio apparatus
US2150388A (en) * 1936-06-27 1939-03-14 Western Electric Co Terminal for electrical devices
US2632832A (en) * 1951-03-23 1953-03-24 Chicago Telephone Supply Corp Terminal construction for variable resistors
US2667624A (en) * 1951-05-09 1954-01-26 Basil A Bels Coil forms with ends of inslation having electrical terminals thereon
FR1100973A (en) * 1954-03-11 1955-09-27 Cie Ind Des Telephones Improvement in electric coil casings
US2773159A (en) * 1954-09-30 1956-12-04 Robert W Taggart Wire-wound resistance units
US2922138A (en) * 1956-05-03 1960-01-19 Cambridge Thermionic Corp Electric mount
US2922932A (en) * 1956-06-25 1960-01-26 Sessions Clock Co Magnetic coils

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1163904A (en) * 1914-12-07 1915-12-14 Western Electric Co Terminal mounting for metallic spools.
AU929432A (en) * 1932-09-20 1933-09-28 Sox LIV Corn Mitchell Arthur William Baker Improvements in inductance coil formers andthe like especially those for radio apparatus
US2150388A (en) * 1936-06-27 1939-03-14 Western Electric Co Terminal for electrical devices
US2632832A (en) * 1951-03-23 1953-03-24 Chicago Telephone Supply Corp Terminal construction for variable resistors
US2667624A (en) * 1951-05-09 1954-01-26 Basil A Bels Coil forms with ends of inslation having electrical terminals thereon
FR1100973A (en) * 1954-03-11 1955-09-27 Cie Ind Des Telephones Improvement in electric coil casings
US2773159A (en) * 1954-09-30 1956-12-04 Robert W Taggart Wire-wound resistance units
US2922138A (en) * 1956-05-03 1960-01-19 Cambridge Thermionic Corp Electric mount
US2922932A (en) * 1956-06-25 1960-01-26 Sessions Clock Co Magnetic coils

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