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Publication numberUS316354 A
Publication typeGrant
Publication dateApr 21, 1885
Filing dateJun 23, 1884
Publication numberUS 316354 A, US 316354A, US-A-316354, US316354 A, US316354A
InventorsCoil For Induction
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 316354 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

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No. 316,354. Patented Apr. 21, 1 885..


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6PECIFICA'I'ION forming part of Letter :5 Patent No. 316,354, dated April 21-, 1885.

Application filed June 23, 1684. (N0 model.) Patented in England February 1-2, 1884, No. 3,173; in France February 27, 1884, No. 160,603; in Belgium February 29,1884, No. 64,324; in Germany March 12, 1881, No. 28,947, and in Italy April 15, 188},

T0 ctZZ whom it may concern:

Be it known that we, LUOIEN GAULARD, a citizen of the Republic of France, and JOHN DIXON GIBBs, asubject of the Queen of Great Britain and Ireland, both residing at 18 arwick Street, Regent Street, in the county of Middlesex, England, have invented certain Improvements in Goils for Induction and other Electrical Apparatus, (for which we have obtained patents in Great Britain, No. 3,173, dated February 12, 1884; France, applied for February 27, 1884; Belgium, February 29, 1884, No. 64,324; Italy, applied for April 15, 1884, and Germany, applied for March 11, 1884,) of which the following is a specification.

Our invention has for its object to construct coils for the production or passage of currents of electricity in such a manner that, while they are readily and cheaply made, they present a large surface and can be readily connected up according to the requirements of the circuits.

According to our invention as applied to the construction of secondary coils, we form the conductor for the primary current and the conductor in which the induced current is produced of a series of annular disks slit across at one part and furnished with ear-pieces at either side of the slit, the said ear-pieces extending from the outer circumference of the annular disks. The conductor for the primary current is made up of a series of these annular disks, and the conductor for the induced current is made up of another series of these annular disks, the two series being so interlaced that the convolutions of the helix formed by the disks for the primary circuit alternate with the convolutions of the helix formed by the disks of the induced circuit. An annular disk of insulating material is placed between each convolution of the double helix thus formed, and the car-pieces of all the disks for the primary current are soldered or electrically connected together, and the earpieces of all the alternate disks for the induced current are similarly soldered or electrically connected together. The double helix thus formed can be provided with an iron core and completedasinordinaryinduction-coils. The induced current can be collected and utilized by connecting the secondary circuit-wires to the secondary circuit-helix in accordance with the requirements of the apparatus of consumption.

A single helix constructed as described can be employed for the coils of dynamoelectrical machines and for electrical coils generally.

Heretofore a single coil has been devised in which a series of split disks are connected at the ends to form a series, they being otherwise insulated from one another; but an induction-coil composed of primary and secondary circuits has never, so far aswe are aware, been made of split disks.

The invention consists in such a coil, and also in certain special constructions applicable to single coilsas well. One of those special new features is the connection in series of the split disks outside of the coil by means of cars or lugs at the edges of the disks, each of which is provided for the purpose with a pair of such cars. Another new feature is the use of continuous insulating-disks to separate the disks one from the other. I11 the sin gle coil referred to as having been heretofore devised the connection was made inside the coil by wedges, pins, or strips of metal between adjacent disks, and the insulating as well as the conducting disks were split. Some of the disks had each a single ear; but this was for the purpose of connecting an exterior circuit to the disks, the connection of the disks in series being effected independently by the wedges, pins, or strips, before referred to.

And in order that our said invention may be fully understood, we shall now proceed more particularly to describe the same, and for that purpose shall refer to the several figures on the annexed sheets of drawings,the same letters of reference indicating corresponding parts in all the figures.

Figure l is a side elevation, partly in section, of an induction or secondary coil con structed according to our invention. Figs. 2

and 8 represent, respectively, an edge view and a plan of one of the annular disks of copper or other suitable conducting material of which the coil is composed. Figs. 41 and 5 are respectively a side elevation and a plan of a double helix, formed by connecting a number of the annular disks together, and Fig. (3 is a plan of aslightly modified construction of disk adapted for use in the construction of coils for dynamo-machines or the like. Fig. 7 is aplan of an insulating-disk.

The annular concluctingdisks A are divided at one part or provided with an opening or space, as shown at a, and on each side of this opening and extending outside the outer circumference of the disk are cars or projecting pieces a a by means of which the several disks are connected together to form a helix.

In constructing an induction or secondary coil two helices of conducting material are combined, as shown by the full lines and the dotted lines in Figs. at and 5. In connecting the said disks to form the coils the following may be the mode of proceeding: Two of the conductingdisks are placed the one on top of the other, as shown at 1 2, Fig. 4. One of theears or projections of the upper disk is arranged between the ears or projections on the lower disk. Abovethe disk 2 is placed another conducting-disk, 3, so that, say, the right-hand ear or project-ion is over the left-hand ear or projection of the disk 1. Over this disk 8another conducting-disk, t, is placed, so that, say, the right-hand ear or projection thereon is over the left-hand ear or projection of the disk 2, and in this manner any desired nun1- ber of conducting-disks may be connected together, each conducting-disk added to thepile being connected to one of the projections on the disk next but one below it, as will be seen clearly by referring to Fig. at. The cars or projections which overlie each other are electrically connected by solder or otherwise. disk of insulating materialsuch, for example, as paraffined card-boardis interposed between the adjacent conducting-disks. One of these disks is shown in Fig. 7. The disks connected together in the manner described form two separate helices, as shown, respectively, by the full lines and the dotted lines in Fig. 4:, the several convolutions of the helices being insulated from each other by the disks of insulating material.

In forming the secondary coils they maybe compacted together between two surfaces, E E, bybolts or screwed rods and nuts F, as shown in Fig. 1, the projections or cars by which the several conductingdislzs are connected projecting helically or spirally around the coil, (the ears of the primary coil alternating with those of the secondary coil,) and form convenient means for connecting up any number of convolutions, 'as required. The end disks of one of the helices thus formed are connected to the leads of the primary circuit by bindingscrews, as at G G, and the end disks of the crease other helix are similarly connected at II H to the leads for the induced or secondary current. Theintcrposcd disks of paraffined card board or other insulating material prcvcn short circuiting between the helices and th several convolutions thereof; but instead using disks of insulating material for the pui pose, the condnoting-disks, either before 01 after they are connected together, may be coated with varnish or with other suitable insulating material.

I, Fig. 1. is a hollow cylinder of parafiined card-board or other insulating 1naterial,roun d which the helices are arranged, and in this cylinder is a core, K, of soft iron or soft iron wires, which is capable of being raised and lowered in the cylinder, so as to regulate, as required, the current passing through the coil.

In constructing coils for the armatures or the field (or both) of dynainc-machines, or for electro-magnets or analogous purposes, a single helix only is required, and in this case, instead of constructing the annular disks with a wide opening, shown in Fig. 3, there may be a much smaller space between the adjacent cars and ends of the disks, as shown at a in Fig. 6. The cars are connected up as described with regard to the construction of one of the helices of the secondary coil, and the several convolutions of the helix aresimilarly i isulatcd from each other.

Having now described and particularly as certained the nature of our said invention and the manner in which the same is or may be used or carried into effect, we would observe, in conclusion, that what we consider tc be novel and original and therefore claim as our invention is 1. A coil composed of split conductingdisks provided each with a pair of cars and connected in series outside the coil by means of said ears, said disks constituting the convolutions of the cells and being insulated from one another, except for the connection, as aforesaid, through said ears, substantially as described.

2. A coil composed of slit conducting-disks separated one from the other by continuous disks of insulating material and electrically connected in series at the edges of said disks outside the coil, substantially as described.

An ind uction-coil consisting of a primary and a secondary coil, each composed of slit conducting-disks connected in series, the disks of the primary coil being interleaved with those of the secondary coil, substantially as de scribed.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.


CHAS. IiITLLs, EDwD. Gno. DAVIES, Both 0]47 Liaco'llfle Inn Fields, London.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2442615 *Nov 20, 1943Jun 1, 1948Electrical & Musical Ind LtdHigh-frequency tuner
US2535554 *Jan 24, 1949Dec 26, 1950Shell DevClose-coupled electrical transformer
US3271716 *May 28, 1962Sep 6, 1966Advanced Kinetics IncHigh-current pulse transformer
US4129846 *Aug 13, 1975Dec 12, 1978Yablochnikov BInductor for magnetic pulse working of tubular metal articles
US4814735 *Jun 10, 1985Mar 21, 1989Williamson Windings Inc.Magnetic core multiple tap or windings devices
US4901048 *Mar 15, 1989Feb 13, 1990Williamson Windings Inc.Magnetic core multiple tap or windings devices
US5376911 *Jul 30, 1993Dec 27, 1994Asea Brown Boveri Ltd.Choke coil
US6154111 *Apr 8, 1999Nov 28, 2000Deutsche Thomson-Brandt GmbhStorage coil
Cooperative ClassificationH01F5/02