US1391256A

US1391256A - Induction-coil structure

Info

Publication number: US1391256A
Authority: US
Publication date: 1921-09-20
Anticipated expiration: 1938-09-20

Description

A. A. KENT.

INDUCTION COI\L STRUCTURE. APPLlb/nlou FILED luLY 9. 1921.

1,391,256, Patentedseptfzo, 1921.

2 SHEETS-SHEET l.

A IllllllllllIlll/llll/111111 ll/ l INVENTOR BY M S6612/ 'MMM A. A. KENT.-

INDUCTION COIL STRUCTURE.

APPLICATION mso JULY 9, 1921.

Pawnwdsept. 20 1921.

2 SHEETS-SHEET 2.

//////////////, f/l/////// f/ l a l INVEN/ y ARTHUR 'ATWATEE KENT, or ARDMOE'E, PENNsYLvANIAgAssIGNoE To ATWATER KENT MANUEACTUEING'COMPANX, or PHILADELPHIA, PENNSYLVANIA, A con,

PORATION vrF PENNSYLVANIA.

INnUcTIoN-COILFSTEUCTUEE.

, Be itr .known thatI, ARTHUR ATWATEE KENT, a citizen of thefkUnited States, resid-fv ing in Ardmore, county of Montgomery and State ofk Pennsylvania, have invented certain new' and useful improvements in Induction-Coil Structures, of which the fol-4 lowing is a specification.

My'y invention relates to indu'ctioncoils and particularly to' those coils that. are:l yadapted forusein the sparking systemslof internal combustion engines.

The objects of-thisxinvention, lare to piro-y vide` an induction coil that `is entirely 1n-- closed and protected, rand isV also easily and ycheaply constructed landfassernbled; t'o pro= videa casing therefor, which is strong, stiff,3

durable and light inweight; `to provide the induction coil proper with a suitable resist-71, ance to prevent heating of the coilfwhenrthe primary circuit is rclosed for relatively long@ periods, to provide ahousingforl the resistance ,and to make afcoil which is. attractive,' Land simple 1n appearance.

Other objects'of my invention will appear in the yspecification and claims below.

Referringto the drawing forming apart of this .specificationand in which the same` reference characters arev used to designate the same parts throughout lthe views Figure 1 1s a vertical section of an inductioncoil emobdying my invention,the primary and.

secondar windings not being shown in secs tion; an Fig. 2 is aplan viewv of the device shown in Fig. 1,-.with the upper outerv capy or.y

cover removed.

Fig. 3 is a yview,`siinilar to Fig. ,1, show# ing a modified construction, and Fig. '4 is a plan view of the lSame with theouter cap re'- moved.k

Figs. I 5,kr c,y 7 andl s show further modified forms of the inventionv ,i

' The induction coil proper consists of' two;

windings, as usual, 'a .primary winding or coil l1 and a secondary winding or 60H2. v surrounding the primary OOL .The Casing therefor preferably consists of insulating material in `the form of a tube 3 of cardboard, liber, or other 'thick paper. Into one.'y

end of said tube 3 a disk- 4, preferably of sheet metal, having an integral peripheral ftaching, thereto a lead wire "ondary circuit.

"spificatibiI-or Leitersratent. Y kPatented Sept. 20, 17921.

` Continuationr of application` Serial No. 131,749, led November 16,

v 1921. LVSerial No. 483,423.

cylindrical flange 5, slightly larger than the diameter of the interior of the tube 3, is

forced under considerable pressure with af `flange extending tightly into the tube 3, and

the disk 4 substantiall flush with th the tube 3. y' e end of Over that end of the tube 3 into whichfy the flanged disk 4 has been so inserted, a sheet metal ring 6 is next forced, under pressure,l said ringG being provided with an integral cylindrical Hange 7 of they same diameter as, or vslightly smaller thanrthev outside diameter of the tube 3, and which tightly fits over the-exterior surface of the 191,6. This application leduly 9,M

end ofthe tube 3. .In this manner the cylindllCill flanges 5 and7 of the disk 4 and ring :6, respectively, tightly clamp and hold the.

tube 3 between themy yand the said flanges alsogreatly. stiffenthe saiddisk 4, ring 6 Vand .tube 3. Y p A disk 8 of cardboard, fiber or other ma'.-

l terial, which-is preferably non-magnetic and ra non-conductor of electricity, is thenplaced y within-the tubev3 resting on the disk 4 and the induction coil, comprising thepriinary fcoil 1 and secondary coil 2, is placed centrallyy in the tube 3 resting on the disk 8 andv fwith `a terminal 9 ofthe secondary coil 2 'connected to the primary lead 10, through which 1t may be grounded or otherwise suitably connected incircuit I c The other terminal 11 of the secondary coil is attached to a ybinding post 12 passing through 1 and tightly fitting into a hole throughthe tube 3. The binding'post may be ,providedfwith a flanged head 13 and electrical contact. The outer end of said -binding'stud 12 may be provided witli screw" 'threads 15 over which'the knurled nut 16l may be `threaded for the purpose' of at- Gneterniin'al 1S of the'lprimary coil"v is 17 of the secy y'betweenfsaid-head'l and al Inetalwvasher 14, the said terminal 11v may be heldingood preferably connected to the lead l0 and i may be thus grounded. The other tlead19 is Apreferably left extending upwardly from -th'eprimary coil 1.

ico

The tube 3 with theinduction coil therein is then preferably filled with melted'wax, i'

paraffin, or some similar insulating material 20 to nearly the top of the tube 3 so that the induction coil is completely inclosed and covered thereby and the war; is allowed to cool and solidify, the terminal 19 of the primary coil extending above the top surface of the wax or paraffin.

The terminal 19 of the primary coil is now passed through an opening 21 in an inner diaphragm, cover or cap 22, preferably of sheet metal, and comprisinga disk-like top 23, and a cylindrical flange 24, the outer diameter of which flange is of the same or slightly larger diameter than the inner diameter of the end of the Vtop of the tube 3. The liange disk 22 is then forced under pressure tightly into the tube 3 until the top end of the tube and the top 23 of the inner cover 22 are substantially fiush.

On the top of the inner cover 23 is secured a preferably rectangular sheet or plate of mica 25 around which is wrapped in spiral separated coils a length of preferably nickel wire to form a resistance coil 26. 'Ihis mica plate 25 may be secured to the top 23 of the inner cover 22 by a rivet 27 passing through said mica plate 25, through a bushing 28, which may be of insulating material,-

and through an insulating washer 29 and a metal washer 30 on the other 0r inner side of the inner cover 22. One end of said resistance coil 26 is secured in any suitable manner to the end of the lead 19 passing through the opening 21 of the inner cap 22.

Over the upper end of the tube 3, and inclosing the resistance coil mounted on the top of the inner cover or cap 22 is an outer metal cover or cap 31, provided with a cylindrical flange 32, the inner diameter of which is slightly less than the outer diameter of the tube 3. This uter cap or cover 31 is preferably provided at its center with a brass stud 33, the top end of which is passed through a suitable opening in the top of the outer cap or cover 31 and is headed over by pressure and thus firmly substantially riveted thereto. This brass stud or bushing 33 is preferably provided inside of the cap or cover 31 with a groove 34 into which one end of the piece of copper wire 35 is wrapped. Preferably this wire 35 is wrapped around the said stud or bushing 33 when the bushing is inserted through the cap 31 and then the said stud 33 is compressed between dies under high pressure to head over the top of the stud or bushing 33 and secure it thus to the cover, and to close the groove 3 4 upon the wire 35 to firmly unite the said wire 35 to the stud or bushing 33.

The stud or bushing 33 is preferably provided with a tapped hole 36 for the reception of a binding screw 37 to which a lead 38, adapted' to be attached to the interrupting mechanism may be attached.

The other end of the resistance coil 26 is connected to the copper wire 35 and then the outer cap or cover 31 is forced under pressure over the outer surface of the upper end of the tube or cylinder 3. In this manner the tube 3 is made stiff and rigid by being clamped tightly between the flange of the inner cap or cover 22 and the flange of the outer cap or cover' 31.

The cap or cover 31 is preferably provided with a plurality of holes 39 to permit of the free circulation of air over the resistancecoil 26, thus inclosed within a chamber between the inner and outer caps or covers 22 and 31, respectively.

In Fig. 3 is shown a modified form of induction coil in which the lead 19 is attached directly to the metal cap 22 by a bolt 40 and metal washer 41, and the adjacent end of a spiral resistance coil 26, preferably of nickel wire, is clamped by a nut 42 on said bolt 40, between a metal washer 43 and the top of Vthe cover 22. The other end of the coil 26 is, however, clamped, between insulating washers 44 and 45 surrounding the ends of an insulating bushing 46 passing through the cover 22 and through which a bolt 47 passes. A nut 48 on the end of the bolt 47 holds the end of the resistance coil firmly 0n but insulated from the inner cap 22. In this case the lead 38 may extend through a bushing 49 of insulating material through the outer cap 31 and is held clamped in electrical engagement with the end of the resistance coil 26 by the bolt 47.

In Fig. 5 is shown a still further modified form of the device. In it the inner cap 22 is provided with an insulating washer or bushing 50 through which the lead Y19 passes. In this manner the inner cap 22 is completely insulated from the lead 19, from the induction coil and is also insulated from the resistance coil 26.

In Fig. 6 is a further modified form. The lead 19 is in this instance soldered directly to the under side of the inner cap 22 and one end of the resistance coil 26 is soldered to the top of the cap or cover 22. In this manner the inner cap is made a part of the conductor of the primary circuit and the passing of the lead 19 through the inner cap 22 is obviated.

Sometimes it is; desirable to lead the ground wire 10 through the outer cap 31 and this arrangement is shown in Fig. 7 in which the inner cover 22 is provided with an insulating bushing 51 and the outer cap 31 isprovided with an insulating bushing 52 through which the lead 10 is conducted to the outside of the casing. In this modified form of the invention the resistance coil 26 and the lead 19 are shown as soldered, respectively, to theopposite sides of the inner cap 22, as in Fig. 6.

When it is desired so to do the resistance of the tube 3`through bushingsl and`55,

res ectively. f f

`he induction vcoils abovek described are particularly yadapted for yuse in normally closed sparking Vcircuits of internal combustion engines, thatfis to say, in systems in Which the primary circuit is held normally closed`and the spark is caused by a current induced in the secondary coil by breaking the primaryv circuit. Resistance 26 serves to vcontrol or limit 'the current in ther primary Winding, rof the indu'ctioncoil.

By tightly forcing the aanged disk 4 wahin the ring 6 overthe outside of the tube 3, and the flanged disk 23l within and the outer cover or :ca 31 over ythe outside ofthe tube 3, the who ei tube or casing V3 is madevery stiff` andrigidf The parts are permanently united togetherwithout cement, screws, or any other fasteningk devices, for. the friction between the tube and vrthe/.said parts serves to holdthe parts rigidly and permanently together, making otherfastening means un` necessary. f l Y e While vI yhavefreferredto l'thefuse of solidified oncongealed paraiiin in'whichthe coil is embedded and covered, any other suitable insulating material may be substitutedk therefor asfoccasion'might make expedient.

The inner heads4 and 22, the ring 6 and the outer cap 31 are preferably stamped from sheet metalandtheir flanges snugly lit the Ladjacent surfacesfof'said tube 3 into engagement` with which' they are forced underconsiderable pressure. e

This application isa substitute for or continuation yof application Ser. No.f131,7.49, filed November 16,1916. n

What I claim is: A y

l. Induction coil structure comprising an inclosingcasin'g, any induction coil therein, a cap on one end of said casing, and a resistance element connected in series with the primaryv ofsaid induction coildisposed between said cap and said inductioncoilg 2. Induction coil structure comprising an inclosingk casing,an induction coil i. therein,

a perforated r,cap on one vend ofr said casing,A

anda .resistance elementconnected' with the primary of said induction coil disposed between said `cap rand said induction coil.

3. Induction coil'structure comprising an inclosing casing, an yinductioncoil therein, a cap on one end of said y casing,a resistance element series with the primary of said induction coil disposedibetween said cap and saidinduction coil, and a primary ter-` minal carried by said cap.

4. Induction coil structure 'comprising an,V inclosing casing, an induction coil therein, a cap on one end of said casing, a resistance element connected With the primary of said induction coil disposed between said `cap and saidinduction-coil, and a primary ter-y minal carried by said cap and connected to said resistancey element 5. Induction coil structure comprising an inclosing casing, an induction coil therein, alead common to the primaryl and secondary 4coils of said induction coil extendingxthrough the side of saidl casing, a connection to the otherterminal of said secondary extending through the side of said casing, a vcap on said casing, a resistancel element disposed between said cap and said induction coil, la termina-l carried by said cap, and a connection from the other terminal of said primary coil to said terminal i on said vcap through said resistanceelement.

6. Induction coil structure comprisingan inclosing casing, an inductioncoil therein, a lead connected'with one terminal of the primary coil extending through the side of said casing, aconnection to a terminal of the secondary `coil extending throughthe sidefof said casing, a cap on said casing, a resistance element disposed between said cap andsaid induction coil, a terminal carried by said cap, and a connection from the e other terminal of said -primary coilto said v100 terminal on saidk cap through said resistance element. n i

7. yInductionfcoil structure comprising an inclosingcasing of insulating material, an

induction coil therein, metallic caps engag-* ing said casing internally and externally and .insulated from each other by said casing,

and insulated from each otherpby said cask ing, a resistance yelement inthe space between said caps, and a terminal carried by the external cap `and connected with they prie,v mary ofsaidinduction coil through said resistance element.M K

9. Induction vcoil structure comprising an inclosing casing, an induction coil therein,

a cap` on said casing, a metallic member between said cap and said induction coil forming an end closure for said casing, a support of insulating material carried by said metalf lic member and disposed between it and said y cap, and a resistance` element disposed upon said insulatingsupport and connected With the primary of said induction coil.

10. Induction coil structure comprising an inclosing casing, an induction coil therein, a cap on said casing, a metallic member between said cap and said induction coil forming an end closure for said casing, a support of insulating material carried by said metallic member and disposed between it and said cap, a resistance elementV disposed upon said insulating support, a terminal carried by said cap, and a connection from said terminal to the primary of said induction coil through said resistance element.

11. Induction coil structure comprising an inclosing casing, an induction coil therein, a cap on said casing, a. metallic member between said cap and said induction coil forming an end closure for said casing, a conducting member carried by and insulated from said metallic member, a support of insulating material held by said conducting' member and disposed between said cap and said'metallic member, and a resistance element carried by said supporting` member and connected with the primary of said induction coil.

1Q. Induction coil structure comprising an inclosing casing, an induction coil therein, a cap on said casing', a metallic member between said cap and said induction coil forming an end closure for said casing, a conducting` member carried by and insulated from said metallic member, a support of insulating material held by said conducting member and disposed between said cap and said metallic member, a resistance element carried by said supporting member, a terminal carried by said cap, and a connection from said terminal to the primary of said induction coil through said resistance element.

13. Induction coil structure comprising an inclosing casing having two chambers, one of said chambers containing an induction coil, and the other of said chambers containing' a resistance element for limiting the flow of current to said induction coil.

lll. Induction coil structure, for use in an ignition system of a kmotor vehicle, comprising an inclosing` casing having two chambers, one of said chambers containing an induction coil, and the other of said chambers containing a resistance element for limiting' the flow of current to said induction coil.

15. Induction coil structure comprising an inclosing casing having two chambers, one of said chambers containing an induction coil, and the other of said chambers containing means for limiting the flow of current to said induction coil.

16. An induction coil unit comprising the combination of a casing comprising a cylindrical tube 0f insulating' material, inner sheet metal heads each having a cylindrical flange forced into opposite ends, respectively, of said tube, with the outer surface of said flanges in tight frictional engagement with the interior surface of the ends of said tube, and outer sheet metal end members each having a cylindrical flange forced over the ends, respectively, of said tubes with the interior surface of said flanges in tight frictiona-l engagement with the exterior surface of the ends of said tube, an induction coil within said casing, and insulating material filling the space between said coil and said casingand inclosing said coil. 1T. An induction coil unit comprising the combination of a cylindrical tube of insulating material, a disk of sheet metal having a cylindrical fiange forced into one end of said tube with the outer surface of said flange in tight frictional engagement with the inner surface of the end of said tube, an outer member having a cylindrical flange forced over said end of said tube with the inner surface of said flange in tight frictional engagement with theouter surface of said tube, a member of insulating material within said tube and positioned on the inner surface of said fianged disk, and an induction coil in said tube resting on said sheet.

18. An induction coil unit comprising the combination of a cylindrical tube of insulatlindrical fiange tightly forced into one end of said tube, an outer member having a cylindrical flange tightly forced over said end of said tube, said disk and said outer member being fixedly retained in position by the friction between them and said tube, an induction coil in said tube embedded in con- `sealed insulating material, poured in a fluid condition into the space between said coil and said tube, a metal disk having a cylindrical flange tightlyrforced into the other end of said tube, and an outer cap of sheet metal having a cylindrical flange forced over said last mentioned end of said tube, said last mentioned-metal disk and said outer cap being permanently retained on said tube by the frictional engagement between them and said tube.

19. An induction coil unit comprising the combination of a cylindrical tube, a head forced into one end of said tube having its outer surface flush with the end of said tube and a ring member forced over the outer surface of said end of said tube, an induction coil within said tube and surrounded by insulating material, a head forced into the other end of said tube with its outer surface substantially flush with the other end of said tube and a cap forced over the said last mentioned end of said tube, said heads,

cap and ring being retained permanently to said tube by friction between them and said tube, and serving to make said paper tube stiff and rigid.

20. An induction coil unit comprising the combination of an insulating tube, fianged ingmaterial, a sheet metal disk having a cyy flange tightl said tube an heads'of sheet metal tightly forced into opposite ends of said tube, a flanged ring `of rigid material tightly "forced over the eX- terior surface of one end of said tube, ajcap of sheet metal provided withv a cylindrical forced over the other end. of roviding a chamber between saidcap and t e `head forced into that end of said tube, an induction coil contained within'saidtube, a binding post secured to said tube intermediate the ends thereof, a terminal of the secondary winding of the said coil being attached to said binding ost, and a terminal of the primary windin of saidinduction coil passing through sald ca and the head in the same end of said tu 21. An induction coil unit comprising the ycombination of a tube, an induction coil mountedy therein, a Vflanged metal cap eX- tending over` the outer surface of said end'of said tube and providing a chamber between said cap and said induction coil, and aresistance mounted in saidV chamberand connected in series withthe primary winding of said induction coil.`

22. An induction coil unit comprising the combination of la tube of insulating material closed at one end, an induction coil within e vided with openin said tube, a diaphragm inf-the end of said tube, avcap 'extendingover the outer surface of said end of said tubefand providing a chamber between said cap and said diaphragm, and a resistance mounted within said chamber in series with the primary winding of said coil, said cap being profor circulation of air throu h said cham er. y t

23. n an ignition sparking means for an i ition system for use in a motor vehicle, t ey combination of anvinduction coil hermetica'llyfembedded in insulating material, a cylindrical tube of insulating material surrounding said embedded coil, flanged metal disks with theflanges thereof tightly forced Within the oppositevr ends of said tube, a

l flanged ring with the flange thereof tightly forced over yone end of said tube,`a flanged `cap with the flange thereof tightly forced said cap are permanently and rigidly frictionally secured together, and a resistance coil connected -in the primary circuit of said induction coil and mounted upon one of said fianged'- disks between said fianged disk and said flanged cap.

24. Aunitary sparking device for ignition systems used in motor vehicles, comprising an induction coil hermetically embedded in congealed insulatinv material, a rigid tube of insulating material surrounding said embedded coil, circular flanged members tightly forced within and over the ends of said tube for frictionally, ermanently and rigidly securing said mem ers to said tube, and a resistance connected in the primary circuit of said induction coil inclosed in a space formed between two of said flanged members.

25. Aunitary ignition sparking device for use in an ignition s stem of a motor vehicle, comprising an in uction coil hermetically embedded in congealed insulating material, a tube of insulating material surrounding said coil, spaced end heads respectively in f prising the combination of a tubular casing,

an induction coil therein, a diaphragm within and extending across said casing at one end of said induction coil, a cap on said casing s aced from said diaphragm to form a Vcham er, and a resistance disposed in said chamber and connected. with the primary winding of said induction coil.

In testimony whereof I have hereunto affixed my signature :this 30th day of June,

ARTHUR ATWATER KENT.