EP0053644A1 - Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method - Google Patents

Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method Download PDF

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Publication number
EP0053644A1
EP0053644A1 EP19800401779 EP80401779A EP0053644A1 EP 0053644 A1 EP0053644 A1 EP 0053644A1 EP 19800401779 EP19800401779 EP 19800401779 EP 80401779 A EP80401779 A EP 80401779A EP 0053644 A1 EP0053644 A1 EP 0053644A1
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EP
European Patent Office
Prior art keywords
mandrel
flaps
flanges
winding
coil
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.)
Withdrawn
Application number
EP19800401779
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German (de)
French (fr)
Inventor
Gérard Haroux
Marc Dujardin
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.)
Sa Clarel
Original Assignee
Sa Clarel
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 Sa Clarel filed Critical Sa Clarel
Priority to EP19800401779 priority Critical patent/EP0053644A1/en
Priority to FI813955A priority patent/FI813955L/en
Publication of EP0053644A1 publication Critical patent/EP0053644A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings

Definitions

  • the subject of the present invention is a method of manufacturing a winding around a choke or transformer core, for example a ballast choke for fluorescent lamps, in which the winding is wound on a mandrel corresponding to the core. on which he is then put on.
  • a choke or transformer core for example a ballast choke for fluorescent lamps
  • the invention also relates to coil heads adapted to this method.
  • the object of the invention is to provide a process adaptable to the manufacture of choke cores or transformers of a predetermined section, but of different length from series to series. Another object of the invention is to facilitate automatic operations during manufacture.
  • the method according to the invention is characterized in that there is on each longitudinal face of the mandrel a foldable insulating sheet, suitably cut, in that one applies to the end faces of the mandrel coil heads bordered by flanges and whose base is extended by foldable panels along a predetermined distance, the longitudinal faces of the mandrel, in that a part of the insulating sheets is wedged below the said foldable panels, in that the winding wire is wound on the bases and foldable sides of the coil heads, which has the effect of tightening the sides against the mandrel and in that the edges of the insulating sheets are folded over the finished winding.
  • Figure 1 of the drawing shows, in perspective, a coil head and Figure 2 a winding of a partially cut laminated iron core.
  • a mandrel (not shown) having the dimensions of part 1 of a core intended to support the winding is covered on each of its two longitudinal sides with an insulating sheet, for example of composite paper of a median rectangle 2 invisible in FIG. 2 of the drawing. approximately the dimension of the longitudinal face of part 1 of the laminated iron core.
  • each insulating sheet is p Rolon - gen e by a trapezoidal part 3 and a rectangular portion 4 more Longer than rectangle 2, for example the length of the longest side of the trapezoidal part 3 and less wide than rectangle 2.
  • each coil head comprises a base 5. flanked by flanges 6.
  • the base 5 is extended on either side of the section of part 1 of the core by foldable sections 7 which run along and cover the middle rectangles 2 of the insulating sheets .
  • the foldable sides 7 are not perpendicular to the base 5 but include with this base obtuse angles a little larger than right angles which facilitates the insertion of the coil heads on the mandrel lined with insulating sheets and ensures a wedging of the rectangles 2 of the insulating sheets under the sides 7 against the mandrel, not shown.
  • the flanges 6 have indentations 8 and / or 9 in order to allow a slight arching of the base 5 or a folding of the sides 7 relative to the base 5 when, during the winding action, les_pans 7 are applied to the longitudinal faces of the mandrel under the effect of the pressure of the wires It to wind it.
  • the jamming of the insulating sheets under the folding panels 7 is reinforced since the angle between the longitudinal faces of the mandrel and the panels 7 becomes practically zero.
  • notches 8 In place of two notches 8 in the middle of the base 5 as shown in the drawing, four notches 9 can be provided, for example at the places of the edges between the base 5 and the sides 7.
  • the number of notches can be chosen as desired depending on the stiffness of the material forming the spool head in order to obtain the desired result which is to tighten the folding planes 7 on the longitudinal faces of the mandrel lined with insulating sheets when the wire 11 is wound on the spool heads .
  • ribs 12 and 13 are supported on extensions 14 of the base 5.
  • the ribs 13 are arranged obliquely, in order to allow the wrapping of the winding and coil heads by the trapezoidal parts 3 of the insulating sheets. Thanks to these trapezoidal parts 3, which run along the inclined ribs 13, there is everywhere provided a path of sufficient length between the wires Il of the winding and the iron core, either along the surface of the coil head, or along the surface of the insulating sheet.
  • the folding sides 7 can be very thin and allow deformations to ensure the folding down on the longitudinal faces of the mandrel following the force undergone during the winding of the wires 11. In the latter case it is not necessary to provide indentations and thinning (8.9; 8 ', 9').

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

In a method in which the coil is wound over a mandrel corresponding to the core (1) onto which it is then threaded, a flexible, suitably punched insulating sheet (2, 3, 4) is disposed on each longitudinal face of the mandrel, winding heads bounded by flanges (6) and whose base (5) is extended by flaps (7) which can be bent back and which, over a specified distance, run alongside the longitudinal faces of the mandrel, are applied to the end faces of the mandrel, a part (2) of the insulating sheets is wedged beneath the said flaps (7) which can be bent back, the winding wire (11) is coiled onto the bases (5) and flaps (7) of the winding heads, this having the effect of clasping the flaps (7) against the mandrel, and the edges (3, 4) of the insulating sheets are folded onto the completed coil. <IMAGE>

Description

La présente invention a pour objet un procédé de fabrication d'un enroulement autour d'un noyau de self ou de transformateur, par exemple d'une self de ballast pour lampes fluorescentes, dans lequel l'enroulement est bobiné sur un mandrin correspondant au noyau sur lequel ensuite il est enfilé.The subject of the present invention is a method of manufacturing a winding around a choke or transformer core, for example a ballast choke for fluorescent lamps, in which the winding is wound on a mandrel corresponding to the core. on which he is then put on.

L'invention se rapporte aussi à des têtes de bobines adaptées à ce procédé.The invention also relates to coil heads adapted to this method.

L'invention a pour but un procédé adaptable à la fabrication de noyaux de selfs ou de transformateurs d'une section prédéterminée, mais de longueur différente de série en série. Un autre but de l'invention est de faciliter des opérations automatiques pendant la fabrication.The object of the invention is to provide a process adaptable to the manufacture of choke cores or transformers of a predetermined section, but of different length from series to series. Another object of the invention is to facilitate automatic operations during manufacture.

Le procédé suivant l'invention est caractérisé en ce qu'on dispose sur chaque face longitudinale du mandrin une feuille isolante pliable, convenablement découpée, en ce qu'on applique sur les faces extrêmes du mandrin des têtes de bobine bordées de flasques et dont la base est prolongée par des pans rabattables longeant, sur une distance prédéterminée, les faces longitudinales du mandrin, en ce qu'on coince une partie des feuilles isolantes en dessous des dits pans rabattables, en ce qu'on enroule le fil de bobinage sur les bases et les pans rabattables des têtes de bobine, ce qui a pour effet de serrer les pans contre le mandrin et en ce qu'on replie les bords des feuilles isolantes sur l'enroulement terminé.The method according to the invention is characterized in that there is on each longitudinal face of the mandrel a foldable insulating sheet, suitably cut, in that one applies to the end faces of the mandrel coil heads bordered by flanges and whose base is extended by foldable panels along a predetermined distance, the longitudinal faces of the mandrel, in that a part of the insulating sheets is wedged below the said foldable panels, in that the winding wire is wound on the bases and foldable sides of the coil heads, which has the effect of tightening the sides against the mandrel and in that the edges of the insulating sheets are folded over the finished winding.

L'invention est expliquée ci-dessous par rapport à un exemple d'une forme d'exécution en se référant au dessin annexé. La figure 1 du dessin représente, en perspective,une tête de bobine et la figure 2 un enroulement d'un noyau en fer feuilleté partiellement coupé.The invention is explained below with respect to an example of an embodiment with reference to the accompanying drawing. Figure 1 of the drawing shows, in perspective, a coil head and Figure 2 a winding of a partially cut laminated iron core.

Lors de la fabrication de l'enroulement, un mandrin non représenté présentant les dimensions de la partie 1 d'un noyau destiné à supporter l'enroulement est recouvert sur chacune de ses deux faces longitudinales d'une feuille isolante, par exemple en papier composé d'un rectangle médian 2 invisible sur la figure 2 du dessin. approximativement de la dimension de la face longitudinale de la partie 1 du noyau en fer feuilleté. De chaque côté du rectangle 2, chaque feuille isolante est prolon- gée par une partie trapézoïdale 3 et par une partie rectangulaire 4 plus Longue que le rectangle 2, par exemple de la longueur du côté le plus long de la partie trapézoïdale 3 et moins large que le rectangle 2.During the manufacture of the winding, a mandrel (not shown) having the dimensions of part 1 of a core intended to support the winding is covered on each of its two longitudinal sides with an insulating sheet, for example of composite paper of a median rectangle 2 invisible in FIG. 2 of the drawing. approximately the dimension of the longitudinal face of part 1 of the laminated iron core. On each side of the rectangle 2, each insulating sheet is p Rolon - gen e by a trapezoidal part 3 and a rectangular portion 4 more Longer than rectangle 2, for example the length of the longest side of the trapezoidal part 3 and less wide than rectangle 2.

Après le recouvrement par les feuilles isolantes le mandrin est coiffé des deux côtes extrèmes, perpendiculaires aux faces longitudinales par une tête de bobine.Ces têtes de bobine peuvent être constituées de même manière. Sur la fig.2, une seule tête de bobine est visible appliquée sur la partie 1 du noyau. Chaque tête de bobine comprend une base 5. flanquée de flasques 6. La base 5 est prolongée de part et d'autre de la section de la partie 1 du noyau par des pans rabattables 7 qui longent et recouvrent les rectangles médians 2 des feuilles isolantes. Toutefois, les pans rabattables 7 ne sont pas perpendiculaires par rapport à la base 5 mais incluent avec cette base des angles obtus un peu plus grands que des angles droits ce qui facilite l'enfichage des têtes de bobine sur le mandrin garni des feuilles isolantes et assure un coincement des rectangles 2 des feuilles isolantes sous les pans 7 contre la mandrin, non représenté. Les flasques 6 présentent des échancrures 8 et/ou 9 afin de permettre un léger cambrage de la base 5 ou un pliage des pans 7 par rapport à la base 5 lorsque, pendant l'action de bobinage, les_pans 7 sont appliqués sur les faces longitudinales du mandrin sous l'effet de la pression des fils Il de l'enrouler.tent. Lors de ce cambrage ou ce pliage, le coincement des feuilles isolantes sous les pans rabattables 7 est renforcé puisque l'angle entre les faces longitudinales du mandrin et les pans 7 devient pratiquement nul.After covering with the insulating sheets, the mandrel is capped with two extreme ribs, perpendicular to the longitudinal faces, by a coil head. These coil heads can be formed in the same way. In fig.2, only one coil head is visible applied on part 1 of the core. Each coil head comprises a base 5. flanked by flanges 6. The base 5 is extended on either side of the section of part 1 of the core by foldable sections 7 which run along and cover the middle rectangles 2 of the insulating sheets . However, the foldable sides 7 are not perpendicular to the base 5 but include with this base obtuse angles a little larger than right angles which facilitates the insertion of the coil heads on the mandrel lined with insulating sheets and ensures a wedging of the rectangles 2 of the insulating sheets under the sides 7 against the mandrel, not shown. The flanges 6 have indentations 8 and / or 9 in order to allow a slight arching of the base 5 or a folding of the sides 7 relative to the base 5 when, during the winding action, les_pans 7 are applied to the longitudinal faces of the mandrel under the effect of the pressure of the wires It to wind it. During this bending or folding, the jamming of the insulating sheets under the folding panels 7 is reinforced since the angle between the longitudinal faces of the mandrel and the panels 7 becomes practically zero.

En lieu et place de deux échancrures 8 au milieu de la base 5 comme montré sur le dessin, quatre échancrures 9 peuvent être prévus, par exemple aux endroits des arêtes entre la base 5 et les pans 7. Le nombre d'échancrures peut être choisi à volonté en fonction de la raideur du matériau formant la tête de bobine afin d'obtenir le résultat souhaité qui est de serrer les plans rabattables 7 sur les faces longitudinales du mandrin garnies des feuilles isolantes lorsque le fil 11 est enroulé sur les têtes de bobine.In place of two notches 8 in the middle of the base 5 as shown in the drawing, four notches 9 can be provided, for example at the places of the edges between the base 5 and the sides 7. The number of notches can be chosen as desired depending on the stiffness of the material forming the spool head in order to obtain the desired result which is to tighten the folding planes 7 on the longitudinal faces of the mandrel lined with insulating sheets when the wire 11 is wound on the spool heads .

Lorsque les têtes de bobine sont en un matériau plastique élastique, il est possible aussi de prévoir seulement des affaiblissements de l' épaisseur des flasques 8' ou 9'. Ces affaiblissements doivent avoir des formes comme le montre la fig. 1, pour permettre un allongement plus important sur le dessus des flasques 6 par rapport à l'allongement néces- saire à la base des flasques 6.Les diverses variantes d'échancrures 8 et 9 et d'affaiblissements 8' et 9' sont montrées chacune sur une des deux figures . Il est évident qu'en réalité on choisit la solution qui convient le mieux: soit des échancrures, soit des amincissements d'épaisseur soit encore une combinaison de ces deux possibilités. Un endroit particulièrement favorable aux dispositions d'un amincissement d'épaisseur sont les parties 10 adjacentes aux pans 7. Ces amincissements permettent un allongement élastique des extrémités des flasques lorsque les pans 7 s'appliquent fermement sur les faces latérales du mandrin sous l'effet de la pression des fils 11 de l'enroulement. Cette dernière solution a l'avantage d'assurer des distances de cheminement de longueur suffisante, partout entre fils Il et noyau 1.When the coil heads are made of an elastic plastic material, it is also possible to provide only attenuations in the thickness of the flanges 8 'or 9'. These debuffs must have forms as shown in fig. 1, to allow greater elongation on top of the flanges 6 with respect to the elongation neces- its ire at the base of the flanges 6.The different variants of notches 8 and 9 and attenuations 8 'and 9' are each shown in one of the two figures. It is obvious that in reality we choose the best solution: either indentations, or thinning of thickness or even a combination of these two possibilities. A particularly favorable place for the provisions of a thinning of thickness are the parts 10 adjacent to the flaps 7. These thinning allow an elastic elongation of the ends of the flanges when the flaps 7 are firmly applied to the lateral faces of the mandrel under the effect of the pressure of the wires 11 of the winding. The latter solution has the advantage of ensuring tracking distances of sufficient length, everywhere between wires II and core 1.

.Pour assurer la résistance des flasques 6 à la pression exercée par les fils 11, des nervures 12 et 13 s'appuient sur des prolongements 14 de la base 5. Les nervures 13 sont disposées en oblique, afin de permettre l'enveloppement de l'enroulement et des têtes de bobine par les parties trapézoïdales 3 des feuilles isolantes. Grâce à ces parties trapézoïdales 3, qui longent les nervures inclinées 13, on assure partout une distance de cheminement de longueur suffisante entre fils Il de l'enroulement et le noyau en fer, soit le long de la surface de la tête de bobine, soit le long de la surface de la feuille isolante..To ensure the resistance of the flanges 6 to the pressure exerted by the wires 11, ribs 12 and 13 are supported on extensions 14 of the base 5. The ribs 13 are arranged obliquely, in order to allow the wrapping of the winding and coil heads by the trapezoidal parts 3 of the insulating sheets. Thanks to these trapezoidal parts 3, which run along the inclined ribs 13, there is everywhere provided a path of sufficient length between the wires Il of the winding and the iron core, either along the surface of the coil head, or along the surface of the insulating sheet.

Les pans rabattables 7 peuvent être très minces et admettre des déformations pour assurer le rabattement sur les faces longitudinales du mandrin suite à l'effort subi lors de l'enroulement des fils 11. Dans ce dernier cas il n'est pas nécessaire de prévoir des échancrures et amincissements (8,9; 8', 9').The folding sides 7 can be very thin and allow deformations to ensure the folding down on the longitudinal faces of the mandrel following the force undergone during the winding of the wires 11. In the latter case it is not necessary to provide indentations and thinning (8.9; 8 ', 9').

Claims (6)

1. Procédé de fabrication d'un enroulement autour d'un noyau de self ou de transformateur dans lequel l'enroulement est bobiné sur un mandrin correspondant au noyau (1) sur lequel ensuite il est enfilé,
caractérisé en ce qu'on dispose sur chaque face longitudinale du mandrin une feuille isolante (2, 3, 4), pliable, convenablement découpée, en ce qu'on applique sur les faces extrêmes du mandrin des têtes de bobine bordées de flasques (6) et dont la base (5) est prolongée par des pans (7) rabattables longeant, sur une distance prédéterminée, les faces longitudinales du mandrin, en ce qu'on coince une partie (2) des feuilles isolantes en dessous des dits pans (7) rabattables, en ce qu'on enroule le fil de bobinage (IV sur les bases (5) et pans (7) des têtes de bobine ce qui a pour effet de serrer les pans (7) contre le mandrin, et en ce qu'on replie les bords (3, 4) des feuilles isolantes sur l'enroulement terminé.1. Method for manufacturing a winding around a choke or transformer core in which the winding is wound on a mandrel corresponding to the core (1) on which it is then threaded,
characterized in that there is on each longitudinal face of the mandrel an insulating sheet (2, 3, 4), foldable, suitably cut, in that one applies to the end faces of the mandrel coil heads bordered by flanges (6 ) and whose base (5) is extended by flaps (7) flanking along, over a predetermined distance, the longitudinal faces of the mandrel, in that a part (2) of the insulating sheets is wedged below said flaps ( 7) foldable, in that the winding wire is wound (IV on the bases (5) and flaps (7) of the coil heads which has the effect of tightening the flaps (7) against the mandrel, and in this that the edges (3, 4) of the insulating sheets are folded over the completed winding. 2. Procédé suivant la revendication 1, caractérisé en ce qu'on découpe les feuilles isolantes pour qu'elles soient constituées par une partie rectangulaire (2) qui s'applique sur le noyau (1), deux parties trapé- zoidales (3) de la hauteur des flasques (6) adjacentes à la partie (2) et deux parties rectangulaires d'extrémité (4) qui se recouvrent lorsqu'on les replie sur l'enroulement terminé.2. Method according to claim 1, characterized in that the insulating sheets are cut so that they consist of a rectangular part (2) which is applied to the core (1), two trapezoidal parts (3) the height of the flanges (6) adjacent to the part (2) and two rectangular end parts (4) which overlap when folded over the completed winding. 3. Tête de bobine convenant à l'exécution du procédé suivant une des revendications 1 ou 2, caractérisée en ce qu'elle comprend une base (5) des pans (7) rabattables flanqués de flasques (6), les pans (7) incluant avec la base (5) un angle légèrement supérieur à un angle droit, de manière à faciliter l'enfilage de la tête de bobine sur le mandrin revêtu des feuilles isolantes.3. Coil head suitable for carrying out the method according to one of claims 1 or 2, characterized in that it comprises a base (5) of the flaps (7) flanked flanked by flanges (6), the flaps (7) including with the base (5) an angle slightly greater than a right angle, so as to facilitate threading of the coil head on the mandrel coated with insulating sheets. 4. Tête de bobine suivant la revendication 3 caractérisée en ce que les flasques (6) sont soutenus par des nervures de raidissement (13) obliques longeant le bord des parties trapézoïdales (3) des feuilles isolantes repliées sur l'enroulement terminé.4. Reel head according to claim 3 characterized in that the flanges (6) are supported by stiffening ribs (13) oblique along the edge of the trapezoidal parts (3) of the insulating sheets folded over the winding finished. 5. Tête de bobine suivant une des revendications 3 ou 4 caractérisée en ce que les flasques (6) comprennent une ou plusieurs échancrures (8, 9).5. Coil head according to one of claims 3 or 4 characterized in that the flanges (6) comprise one or more notches (8, 9). 6. Tête de bobine suivant une des revendications 3 ou 4 caractérisée en ce que les flasques (6) comprennent des affaiblissements d'épaisseur (8', 9', 10) à un ou plusieurs endroits.6. Coil head according to one of claims 3 or 4 characterized in that the flanges (6) include thickness weakening (8 ', 9', 10) at one or more places.
EP19800401779 1980-12-10 1980-12-10 Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method Withdrawn EP0053644A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19800401779 EP0053644A1 (en) 1980-12-10 1980-12-10 Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method
FI813955A FI813955L (en) 1980-12-10 1981-12-09 FOERFARANDE GENOM VILKET FRAMSTAELLS EN LINDNING RUNT EN SJAELVINDUKTIONSSPOLE ELLER EN TRANSFORMATORKAERNA SAMT TILL FOERFARANDET ANVAENDBARA INDUKTIONSHUVUDEN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19800401779 EP0053644A1 (en) 1980-12-10 1980-12-10 Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method

Publications (1)

Publication Number Publication Date
EP0053644A1 true EP0053644A1 (en) 1982-06-16

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EP19800401779 Withdrawn EP0053644A1 (en) 1980-12-10 1980-12-10 Method of manufacturing a coil on an inductance or transformer core, and winding heads constructed by this method

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FI (1) FI813955L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0438636A2 (en) * 1990-01-26 1991-07-31 Musashino Tuko Co., Ltd. Double insulated transformer of the coaxial type and method of assembling the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425155A (en) * 1946-04-16 1947-08-05 Gen Electric Coil support
US2511174A (en) * 1948-04-20 1950-06-13 Gerald L Osborne Coil bobbin
FR2123271A1 (en) * 1971-01-30 1972-09-08 Weimer Norbert
DE2119042A1 (en) * 1971-04-20 1972-10-26 Graupner, Doerks & Co, Spezialfabrik für Transformatoren, Drahtwiderstände u. Spulen, 8771 Wiesthal Coil bobbins for transformers, transmitters and the like with several molded protective flaps on the flanges
FR2147032A1 (en) * 1971-07-29 1973-03-09 Tamura Seisakusho Kk
FR2246040A1 (en) * 1973-10-01 1975-04-25 Siemens Ag Inductance ballast coil for discharge lamps - core consists of two sets of stacked plates

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425155A (en) * 1946-04-16 1947-08-05 Gen Electric Coil support
US2511174A (en) * 1948-04-20 1950-06-13 Gerald L Osborne Coil bobbin
FR2123271A1 (en) * 1971-01-30 1972-09-08 Weimer Norbert
DE2119042A1 (en) * 1971-04-20 1972-10-26 Graupner, Doerks & Co, Spezialfabrik für Transformatoren, Drahtwiderstände u. Spulen, 8771 Wiesthal Coil bobbins for transformers, transmitters and the like with several molded protective flaps on the flanges
FR2147032A1 (en) * 1971-07-29 1973-03-09 Tamura Seisakusho Kk
FR2246040A1 (en) * 1973-10-01 1975-04-25 Siemens Ag Inductance ballast coil for discharge lamps - core consists of two sets of stacked plates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0438636A2 (en) * 1990-01-26 1991-07-31 Musashino Tuko Co., Ltd. Double insulated transformer of the coaxial type and method of assembling the same
EP0438636A3 (en) * 1990-01-26 1992-10-28 Musashino Tuko Co., Ltd. Double insulated transformer of the coaxial type and method of assembling the same

Also Published As

Publication number Publication date
FI813955L (en) 1982-06-11

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