US1575341A - Electrical transformer - Google Patents

Description

March 2 1926. 1,575,341

A. A. HOWARD ELECTRICAL TRANSFORMER Filed March "7, 1925 i gman Teammate. I

Application filed March 7,11affsn No. 13,773; I

' To d'ZZ'uihom mag/concern;- '5

. Be it known that L'AUSTINA; HOWARD, a

'l citizen of tthe} United States,- residing at ,Chicago, in the county ofCook and State of Illinois, have invente'd' anew and useful 1m proveinent in Electrical:Transformers, -'of I which the following isa' specification.

, '.This invention relates to improvements in 1 electrical transformers .-l One of the objects of the invention isito' provide aitransformer j which can be easily andche-aply ;madefand which i will be stro'ng and durable. I] have r here 7 shown; the invention 1. asieinbodiedj in a transformer" such "as; isxused in; connection with radio apparatus for the-amplification v ofgwavesiat radio frequency.

Inmaking such; transformers, two coils are employed, a primary coil and a secondary 1 coil. .The'se" coils are arranged in inductive- 20. properly in thisposition. Y the use of -my inventionI am i simplemannen i i I Bythe use of my invention- I am able to produce'a coil in which the dielectric losses :fiare reduced,the staticcharges lessened, and "the-capacity of theltransformer lowered. Other'features and advantages of my inv vention will appear'more fully as I proceed .39 I v f In that formof device embodying the fea- ;-turesf of my invention shown in the accomrelation toeach other and must be supported able to do this in a very with my specification.

, panyingfdrawings, Figure '1 is a top plan view of afcomplete transformer, Fig. 2 is a view taken as indicated by the line 2 of Fig. ,1,1Fig;3.-isja;,topplan view of the dielectric,

for insulator'supportfor, the wires forming a a1section of tubing with a relatively thick, y walland provided with a plurality of slots. 11 ther'ethrough, the series of such slots expart of the transforrner, and Fig. 4 is a fragmentary verticalsectlonal v1ew taken as indicated by theline 4 ofFig. 2.

"As shown in the drawings, 10 indicates a cylindrical supporting member here shown as' made of dielectric or insulating material such as fibre, bakelite, hard rubber or the like. ,This cylindrical member is virtually tending'around the entire circumference of the'support'. The slots 11, it willbenoted,

are not parallel to the axis of the support but each is slanted'slightly from end to end as. most clearly shown 'inFig. 3. I have indicated the remaining portionsof-the cyilindricalshellor support between the slots ll 'by the reference numerals 12, 12, and it fications. V V

struction and arrangement may be made will be noted that these remaining portionsy 12,12 virtuallyconstitute'barsfor stripsupon which the wires are wound as will be explained more 111 detail herelnafter.

By cutting the slots 11 in'the dielectricg upport 10, the "dielectric losses are reduced,

the static charges lessened and the capacity i of th'etransformer lowered. I On the outer surfaces of the bars or strips 12,=there are cut grooves 13, 18, the different cuts on said portions together cons'tituthig one continuous spiral groove on the outer surface f-theEmembenI O except' jas said groove isinterruptedbythe slots '11, 11.

The turns of this groove 13 are spaced apart the primary or inner coil from the secondary V or outer coil.- Obviously, the wall of the member 10 must be of sufficient thickness to permit the requisite depth of the groove 13:

and still furnish'sutiicient strengthto support the wires.

14 indicates the wire forming the inner or primary coil. This wire is wound in the bottom of the cuts 13 which, as stated above,

together form a continuous spiral groove.

, The wire is formed in a continuous spiral c011 and brldges across the gaps 11, 11.

The wire 14: maybe bare as shown or it may be insulated. Preferably the support member 10 is made of insulating mate ria, as stated above, so that the wire 14 may be bare; and when such wire is used the turns are properly spaced and insulated from each other by the groove 13.

- After the primary coil 14: has been wound on. the support, there is wrapped around the same a sheet of any suitable material such This material 1 covers the grooves 13. After this paper is in place there iswound thereon the second' as, for example, paper 15.

arycoillti here shown as consisting of insulated wire. The sheet ofmaterial 15 prevents the turns of the coil 16 from enteringlVhile Ihave shownand described certain embodiments of my invention, it is to be understood that it is capable of many modi- Changes, therefore, in the con j '5 broadly as possible in viewoffthdprior art;

' by LettersPathtjis? v z j ,r VVhat I claini -asfnem; andflsire rtoiseciuref 1 I v anothe rwlite "wQund on the outervsurfaqejo saldgsheatlrlate tial.,f Y

fpopt' a lspibeing proy gled with Cutaway ,.p0'r- 1 13110113,; said, c'ut away;pcz wizi rls interrupt ng l eil'tel ,thavnflt-he dija ine te i of the wire laid I ftherem; a sheet Qf, maijenal wound on sa d gsqppor't iifid"lylilg :over said fgroow'zegland ogtions uptinggzsa 1 said spiralgroove 'I- Wi1 6 laid in thebottbmv ofsaid groove and spanning; sai'chgut away gmsf the rfdepth off sa d groqvei hem-g anothiar 'Wire wou d on the Qiiter siirfac of ,111 its outgr' surfae, said V 7 v March, A; D. ;1 925. I cutaway portions, said slots" grafcer {than the diametij of fth wirej laid supp01t" .aiid lying. over-said ,grdovef; and;

3; A ifdviqe o f f thg {ciiarapte ii desg'ribd comprising; yh nd-i' cal support havmg 31 1 2211 groove: -7 its v P te Surface; i P

P l b ngIp ovi d ith la mg ldilgl; tud nal slo t s or vcut-"away pqrtions sgild slgts 1 gr put away pgi 'clons interrupting";

groove-and spanning said slots vqr cufc I port ons,v thg depth j of ,salcl grpov :belng greater than the diameter oi the Wirgglgud therein}; a sheet of liiat g igil wou id on aid

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