US3388329A - Coil for moving-coil instruments and method of producing the same - Google Patents

Coil for moving-coil instruments and method of producing the same Download PDF

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Publication number
US3388329A
US3388329A US442891A US44289165A US3388329A US 3388329 A US3388329 A US 3388329A US 442891 A US442891 A US 442891A US 44289165 A US44289165 A US 44289165A US 3388329 A US3388329 A US 3388329A
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US
United States
Prior art keywords
walls
coil
frame
moving
pair
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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
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US442891A
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English (en)
Inventor
Ruempelein Fritz
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.)
Agfa Gevaert NV
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Agfa AG
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Publication date
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Publication of US3388329A publication Critical patent/US3388329A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • the present invention relates to coils for electrical measuring instruments, and more particularly to improved supporting frames for the convolutions of coils which may be utilized in moving-coil instruments of exposure meters for photographic cameras or the like.
  • the invention also relates to an improved method of producing the frames which are used in such coils.
  • supporting frames for use in the coils of moving-coil instruments are produced by subdividing a hollow cylindrical body into ring-shaped blanks of desired length and by thereupon bending the marginal portions of each blank radially outwardly so as to form annular flanges.
  • the thus flanged blanks are deformed into frames 'of rectangular outline and are introduced into a winding machine which applies the convolutions of an insulated conductor whereby the convolutions are held against lateral displacement by circumferentially complete flanges at both axial ends of the frame.
  • a serious drawback of such methods is that the production of rectangular frames requires too many steps and must be carried out in complicated and costly machines. Furthermore, and since the ring-shaped blanks are flanged prior to transformation into frames of rectangular crosssectional outline, the flanges develop jagged edges or serrations which are likely to damage the insulation on the conductor or to break the wire.
  • Another object of the invention is to provide a method of the just outlined characteristics according to which all such parts of the frame which serve to prevent lateral shifting of convolutions in a fully assembled coil are free of serrations, ragged edges and similar irregularities which might damage or destroy the windings.
  • a further object of the invention is to provide a method of producing metallic supporting frames for use in the coils of moving-coil instruments according to which the frame blank must undergo much less deformation than the blank of a frame which is produced in accordance with the presently prevailing practice but is still capable of properly retaining and locating the convolutions of a fully assembled coil.
  • An additional object of theinvention is to p'rovide a novel rectangular supporting frame for use in the coil of an electrical moving-coil instrument.
  • Another object of the invention is to provide a frame of the just outlined characteristics which may be massproduced in conventional machinery and which may be produced in any desired size to be useful in highly sensitive as well as in less sensitive electrical measuring instruments.
  • a concomitant object of the invention is to provide a coil which embodies a frame of the above outlined characteristics.
  • Still another object of the present invention is to provide a moving-coil exposure meter or another electrical measuring instrument which embodies a coil having an improved frame which is produced in accordance with my method.
  • one feature of my invention resides in the provision of a method of producing a frame for the coil of a moving-coil instrument or a similar apparatus.
  • the method comprises the steps of forming a tubular body of metallic stock and of rectangular cross-sectional outline whereby the axial length of the body exceeds the desired axial length of the frame, severing the body in one or more planes which are normal to the longitudinal extension thereof to form at least one sleeve-like frame blank having an axial length corresponding to the desired axial length of the frame and two pairs of opposed flat walls, and deforming one pair of such walls so that each thereof resembles a concavo-convex (U-shaped) trough with the concave side facing outwardly whereby the troughs define shallow longitudinally extending channels adapted to accommodate and to prevent lateral shifting of convolutions in an insulated conductor which is to be wound around the walls of the resulting frame.
  • the walls of the other pair may be connected with suitable bearing elements by means of which the coil is installed in a moving-coil instrument.
  • bearing elements may comprise a pair of coaxial arbors whose bases are soldered or otherwise rigidly secured to the inner sides of the other pair of walls.
  • the length of troughshaped walls is preferably less than the length of the other pair of walls.
  • the frame can also support suitable terminals which may be used as conductors of electric current and/or as pointers, and such terminals may 'be soldered to the walls of the frame.
  • the tubular body which is to be severed to yield one or more frame blanks may be produced by upsetting, coldforming, drop-forging or by resorting to any other suitable process.
  • FIG. 1 is aperspective view of a substantially cupshaped tubular metallic body which is about to be subdivided to yield one or more rectangular frame blanks;
  • FIG. 2 is a perspective view of a finished frame
  • FIG. 3 is a perspective view of a partly finished coil which embodies the frame of FIG. 2.
  • FIG. 1 illustrates a tubular "body 1 consisting of metallic material and having a cross 20. It is clear that the bottom Wall 2c is not an essential component of the body 1 and, in the present instance, has been obtained in response to deformation of a billet by the ram of a press which has penetrated into the cavity of a suitably configurated mold. Thus, and depending on the exact nature of the operation which results in the formation of the tubular 'body 1, this body may be open at one or both ends.
  • the body 1 is subdivided to yield one or more frame blanks 4 each of which comprises two pairs of fiat opposed walls 4a, 4b and 4c, 4d.
  • the length of the walls 4c, 4d exceeds the length of the walls 4a, 4b.
  • the planes in which the tubular body 1 is sub divided are indicated by phantom lines 3a, 3b.
  • the frame blank 4 is then inserted into a press which preferably deforms only the walls 4a, 4b in such a way that each of these walls resembles a substantially U-shaped concavoconvex trough 4a, 4b (see FIG.
  • each of these troughs 4a, 4b defines a longitudinally extending shallow channel which will accommodate the convolutions of an insulated condoctor 7 shown in FIG. 3.
  • the directions in Which the walls 4a, 4b are deformed to be respectively converted into troughs 4a, 4b are indicated by arrows a shown in FIG. 2.
  • the inner sides of the walls 40, 4d Prior to convoluting the conductor around the walls 40, 4d and troughs 4a, 4b, the inner sides of the walls 40, 4d are connected with the bases 5a, 5b of two bearing elements here shown as needle-like arbors 5a, 5b which extend into suitable hole jewels (not shown) of a moving-coil instrument in which the finished frame 4' is put to actual use.
  • the arbors 5a, 5b are coaxial with each other and their bases 5a, 5b may be soldered to the inner sides of the flat walls 40, 4a.
  • One or more sheet metal strips 6 may be soldered to the walls of the frame 4' before the conductor 7 is convoluted therearound. Such strips 6 may be used as terminals for connection to electric leads and/or as pointers which cooperate With the scale of the moving-coil instrument.
  • the conductor 7 is convoluted in a suitable winding machine of familiar construction, and its convolutions are held against lateral movement because portions of each such convolution extend into the channels bounded by the concave outer sides of the troughs 4a, 4b.
  • the walls 4a, 4b are transformed into troughs 4a, 4b, they undergo as little deformation as is permissible to still avoid lateral shifting of the convoluted conductor.
  • the deformation of the walls 4a, 4b is substantially less than the deformation of marginal portions in conventional supporting frames wherein such marginal portions must form circumferentially complete flanges at both axial ends of the frame.
  • the troughs 4a, 4b are formed in the last step preceding winding of the conductor 7, their surfaces remain smooth and cannot damage or destroy the insulation of the conductor.
  • tubular body 1 of FIG. 1 may be produced in such lengths that it yields two, three or a very large number of frame blanks 4. Also, in some instances, I may decide to deform only one of the walls 4a, 4b or to deform three or all four Walls of the blank 4.
  • a frame as set forth in claim 2, wherein said bearing means comprises a pair of coaxial arbors each having a base rigid with one wall of said one pair.
  • a coil for moving-coil instruments or the like comprising an annular one-piece frame of substantially rectangular outline and consisting of comparatively thin metallic sheet material, said frame including two pairs of opposed walls, the walls of one of said pairs being substantially fiat so as to facilitate attachment of other elements to said fiat walls and the walls of the other pair resembling troughs of U-shaped cross section having outwardly facing concave sides so that each such trough defines a shallow longitudinally extending channel; and a series of convolutions of an electrical conductor surrounding said walls and having portions accommodated in said channels whereby the walls of said other pair prevent lateral shiftiug of such convolutions.
  • a method of producing a one-piece frame for use in the coil of a moving-coil instrument or the like comprising the steps of forming a sleeve-like blank of rectangular outline having two pairs of opposed fiat walls; and deforming only one pair of such fiat walls into the shape of a concavo-convex trough with the concave side facing outwardly so that the walls of said one pair define shallow longitudinally extending channels adapted to accommodate and to prevent lateral shifting of convolutions in a conductor which is to be wound around the resulting frame while the walls of the other pair of walls remain fiat and therefore can be easily connected to other elements.
  • a method of producing a one-piece frame for use in the coil of a moving-coil instrument or the like comprising the steps of forming a tubular body of rectangular cross-sectional outline whose axial length exceeds the desired axial length of the frame; severing said body in planes which are normal to the longitudinal extension thereof to form at least one sleeve-like frame blank of rectangular outline having two pairs of opposed fiat walls and an axial length corresponding to the desired axial length of the frame; and deforming only one pair of such flat walls into the shape of a concave-convex trough with the concave side facing outwardly so that the walls of said one pair define shallow longitudinally extending channels adapted to accommodate and to prevent lateral shifting of convolutions in a conductor which is to be wound around the resulting frame while the walls of the other pair of walls remain fiat and therefore can be easily connected to other elements.
  • a method of producing a one-piece supporting frame for use in the coil of a moving-coil instrument or the like comprising the steps of forming a tubular metallic body of rectangular cross-sectional outline whose axial length exceeds the desired axial length of a frame; severing said body in a plurality of parallel planes to subdivide the same into a plurality of frame blanks whose axial length corresponds to the axial length of a finished frame and each of which comprises two pairs of opposed fiat walls; and deforming only one pair of walls on each of said blanks into the shape of U-shaped troughs having outwardly facing concave sides so that each trough defines a shallow longitudinally extending channel bounded by smooth surfaces adapted to accommodate and to prevent lateral shifting of convolutions in a conductor which is to be wound around the walls of the resulting frame to form therewith a finished coil while the walls of the other pair of walls remain flat and therefore can be easily connected to other elements.
  • a method of producing a one-piece supporting frame for use in the coil of a moving-coil instrument or the like comprising the steps of forming a sleeve-like frame blank of rectangular outline having two pairs of opposed flat walls; deforming only one pair of said walls into the shape of a concavo-convex trough with the concave side facing outwardly so that such troughs define shallow longitudinally extending channels adapted to accommodate and to prevent lateral shifting of convolutions in a conductor which is to be wound around said walls to form therewith a coil while the walls of the other pair of walls remain flat; and attaching a bearing element to the inner side of each of said fiat walls of said other pair of walls.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacture Of Motors, Generators (AREA)
US442891A 1964-04-24 1965-03-26 Coil for moving-coil instruments and method of producing the same Expired - Lifetime US3388329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA45860A DE1227993B (de) 1964-04-24 1964-04-24 Rahmen fuer die Spulenwicklung eines Drehspulinstrumentes

Publications (1)

Publication Number Publication Date
US3388329A true US3388329A (en) 1968-06-11

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Family Applications (1)

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US442891A Expired - Lifetime US3388329A (en) 1964-04-24 1965-03-26 Coil for moving-coil instruments and method of producing the same

Country Status (4)

Country Link
US (1) US3388329A (de)
AT (1) AT246276B (de)
CH (1) CH419336A (de)
DE (1) DE1227993B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361776A (en) * 1979-07-11 1982-11-30 Sony Corporation Coil assembly for flat brushless motor
EP0098780A3 (de) * 1982-07-09 1984-04-11 Sangamo Weston, Inc. Konstruktion eines Schalttafelinstruments

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US985420A (en) * 1905-06-08 1911-02-28 Hartmann & Braun Ag Wire coil.
US1825105A (en) * 1927-06-15 1931-09-29 Terman Frederick Emmons Inductance coil for radio frequencies
DE915715C (de) * 1940-08-30 1954-07-26 Siemens Ag Drehspulrelais mit Kernmagnetsystem
US2755821A (en) * 1953-04-21 1956-07-24 William F Stahl Laminated tube structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE690149C (de) * 1938-03-30 1940-04-17 Siemens & Halske Akt Ges Drehspule fuer elektrische Messinstrumente
DE966475C (de) * 1953-05-30 1957-08-08 Philips Nv Bewegliche Spule fuer elektrische Messgeraete und Verfahren zur Herstellung derselben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US985420A (en) * 1905-06-08 1911-02-28 Hartmann & Braun Ag Wire coil.
US1825105A (en) * 1927-06-15 1931-09-29 Terman Frederick Emmons Inductance coil for radio frequencies
DE915715C (de) * 1940-08-30 1954-07-26 Siemens Ag Drehspulrelais mit Kernmagnetsystem
US2755821A (en) * 1953-04-21 1956-07-24 William F Stahl Laminated tube structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361776A (en) * 1979-07-11 1982-11-30 Sony Corporation Coil assembly for flat brushless motor
EP0098780A3 (de) * 1982-07-09 1984-04-11 Sangamo Weston, Inc. Konstruktion eines Schalttafelinstruments

Also Published As

Publication number Publication date
AT246276B (de) 1966-04-12
CH419336A (de) 1966-08-31
DE1227993B (de) 1966-11-03

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