US1576439A - Magneto - Google Patents

Description

. March 9 192s.-

1,576,439 .-r. G. Louis IAGNBTO l VFiled Hay 25.. 1922 2 shee'gs-sheete 5% y i if INVENToR A l? I ATTORNEYS ToaZ-@kamin/17mg:Camera) ff Gr.- Louis, a I

knowngthatail, TniiinNon l citizen.-xofgthe `vIrinited; States, :residing at Springfield-,Qin the county'A of A,Hampden and f z State j ofQ Massachusettsaahave vinvented 1 new V faces, which are' and; useful Improvements; inl, Magnetos',` 4whichthe-following isA,afspecification.` l

This; invention relates `toalmagnetos and Vparticularly v tofthat 'classi of magnetOS, wherein fan'-` armature :moves toward i and away vf-roniVY an1d"into"and' outy of Contact o Awith.magnetic poles,v

" Usually, magnetos of class, the

' A armaturemoves .toward Land away froniltlie polesfalong aline parallel withtheaxesof the coresandthere resultsan impingement "of, the:armatu'reV onf-"thel cores. This ar rangement` ordinarily results in a sharp noise fdue to: theimpiingemeiit and niagnetos of "this Y generalfcla's's liavel generally 'been oonflside'red noisy JinA io-perationk While V- much l Ilias" been"l donef in recent years inthe 'way of *reducing fthe* noise due to -iiripingementr and.

l 'Wailea-imammagnet@ @faire Ciassavwhieh are relatively quiet-in operation, thev movement ofthe `armature adi'rection: parallel t to -theaxes ofthe-cores is an arrangeine'nt which tends 'to producernoise Vand'willy be very-n oisyLunless special means are provided tofcounteract n the inherentnoise 'producing tendency. 'if z" yInliei'ioffsuch 1neansxthis inventionk has formitfsobject to move'thelfarmature into and v 'outofengagement'with'itspoles in aman'ner which isjinherently .quietin'A operation.

l JMo'r'e` (particularly.;` the virilvention has for Y sliding 'movementin suchy adir'eotionthat those sur-A to Contact ,witli surfaces of Athe '.magnetic poles "nuoveparallel-` with the f 'last-named fsurfacesI and in such! a manner that', no in(iiairnent-Y,inta. direction` normal to l theffpole` Surfaces can goccur', A wherebyfimf ping'ement, with the Aresultant noise,[is;p're iVeVIltBd-fjf' u 1;". l .i While'gthe karniatur according toyfthe above obj ect, .may be qa'ctuatedby 'any' suitablevmechanism, it is another-,object to pro= "vide niechai'i'ifs'm for v,this Hpurposewhich `is*y also inherently quiet inoperationand whichv consists of a cranlrand link motion, producing harmonic motion of the armature.

In, connection '-wlith the magneto, :there is provided, in. addition to the generating winding',afclielringwindingzwhichfis ary Yiiiefifiiray 26;

iftheline 2-7-2 ofFig. l;

Louis;orisrainerinnn, "Massacnusrigrrs, ns'sieivoa To Wiso {Enno- -VTBICfGOMIeNY-e CQRrQRATION QF. MASSACHUSETTS- Y 1 iiyizi'eivnro.

i922. `l seriai No. 565,912.`

ranged'inran electricalcircuit capable of being opened VandA closed.y This circuit is closed a time'beforethe armature has becomeseparated from its poles and actsto' holdtheflux iii Vthe magnetic circuit `Yuntil an Aappreciable separation vofthe armature and poles'occurs, at'whichrtime it is opened ,As a wherethe armature moves continuously and where the contact between it and the poles `progressively. increases' to a maximum and ,then decreases-to Zero, the choke winding circuit 1s arranged to Vbe opened afterinitial closedl vduring thev time of ydecreasing`c'on tactv and before separationof 'the'armature ture.

'torelease the flux and causea isudden'changeA offlu'X` in the magnetiooircuit for'theigen- Verationrof current in the generating wind= jing'. i f desirable feature, particularly useful brand poles ytoV hold the` `iiuX fas above',` de-I,

lOther-objects and advantages will appear y in the following descriptionland in the illustrative'einbodiment of the-inventionin the Vaccompanying drawings, in vwhich,-

Fig; 1 is a front elevational view of a magneto embodying the-inver'ition.; Fig.A 2 is afsectionalv plan'view taken on" Fig.-3is a vbottom plan viewthereof; f 7 ig. 4 lis ai fragmentary cross-sectional view taken'on the'line 4f-4,of"Fig-. l;

Fig. 5 isga diagrammatical view,- illustra# Vtive of the'magnetic circuit and electrical circuits of the magneto; andf Figs and -7 'are fragmentary smallscale elevational `Views, taken at right angles to a veach other, and" illustrating the manner of 4drivingthe magneto from an engine; Referring tothese drawings the magneto rcomprises, ingene'ral, a suitable source' of ,magnetic linx, cores or .pole pieces therefor, anvv armature movable 'iV-toward and away and intoandout of contact with said cores of alternately low and highpreluctanca :a generating; Winding associated with ithe,

"to periodically connect and disconnectthem fand form a magnetic circuit from said source l 'fateci-ital; i

'nd .thev movable lpoint 5 9 vwasher '45` ,'a11d an .operating'lelver 46= `he Y washer islxedin the illustratedvposition by-fbeingireceived `in afsuitable recess in one 1 ofgibs Q5," as shown inl Fig.:4,iand, between rod .44 is threaded f at its flower end!` band carries "an 4,adj ustablfev Y abutment 749,-* in the.

gThe interrupter i operating mechanism consists of., a InemberL mounted' forfmovement Ain,--agdirection` substantially atright angles tofv'the line off'traveli'of the armatu're. shown, thisi: r'nemberitakesY thefform ofv a -leverf46 which is virtually pivoted at one f'nendftof-,tlie V.member 2l. Ae-"screw :511 passes loosely throughiione fend "o.; lever i546: and is `Vthreadedfinto"member sc ir'cles, screw )'51 and', is; yinterposed V:betweenl i -f niemben; 21' Yand ythefgfupper i'fface yth'us holdingftheopposite:face ofithelatter against tiliefs-headfjofx.'screw:515 The above construction is,` merely illustrativel of L'one of many waysI of mounting' this 'lever `and any yother ysuitable 'way V'I nay. be usedwa's desired.rv The other end of'lever 46 -is -providedjwithf two longitudinally spaced 'and -oppositely directed inclined cam-surfaces 53 and 5 4, which' are fadaptedto be-engagedfby apin 55; projecting laterally tfrom;armature 24 to move the lever 46; downwardly andi,` `by described any suitable-1i `nieans, whetherr such means are,qn1 'ck acting'or. not. The' present means karel'o-:a crank' motion charreasonof abutment 49, i cause the yopening `of the breaker points and 39. .Y l

l r According to some features ofythisinvention,'the armaturemay bev'movedin theppath ac ter -andjareA preferred* 'byl reason ot` their quietness injoperation.although they are not necessarily essentialso far V`as )all :features of gfthe invention are' concerned. Such-finean's -are'jshown in Figs; 26;and' 7, and vpro-duce an' approximately harmonic ,motionf offthe `ar.- r

mature which givesfagradual stop andfstart v at the .vends of lthe strokeaandthus contributes to the desiredresult-oi:` quietoperation.'A The:

particularwayin whiclrtliis vrmotion -is yob- A Vtained from the .engine'.willfvarvjlargely according vtothe .conditions encountered and kis" ,nots particularly material.` l; However, i as' an illustrative example ofone 'suitable mane nernffmountingjhe magneto on," and?;driv-f -tends Stor-force e-pointsyand 3 9 against vthetension` of,V

ing it from, an internal Acombustion engine, .thestrnctureshown in Figs.` 6 and 7 is given; The magneto vi itself, represented conventiony'ally ybyM,`is4 stationarily mounted. in any suitable way on the fr-ameoi` an engine A.

Onfthef cam shaft-c of the engine, ani eccentric-e is fixed,which, by means ofthe strap oscillatesa rocker arm a and Vthe Llatter is connected bylinks Zandm to thezpin 55 `and armature 24; f

it? moves intor engagement` with them. `With these conditions, the choking winding" and interrupter l'mechanism` are essen-r tial for success for theflux must be per-r mitted ftoxbuild up rapidly in the magnetic cir-enit owingto relatively short duration 'of contaetlbetweenwthe armature and poles. ThisluX-niust alSobelield in the'm-agnetic circuit until; the relatively slow movingarmature has created a suiicientair gapin the A magnetic circuit to permit-*a Y' rapid change of flux therein when released. f

#VViththis ltype of magneto, acur'rentmay be generated on Veither or fboth" movements of ythe armature and 'the latter condition' has been illustrated.'` Thus, when` the armature is in-thei1lustrated position, wherein there is ulll and complete contact between itfand In operation, the armature 24 reciprocates the poles, the breaker points'38` and39 are separated because,l `as' the armature neared such position, the pin 55 engaged the'cam 5 3 and-operated lever 46; Thus, the choking winding, which has previously been in'a closed circuit to ret-ard aA building up of `flux in coreslQ, is open circuited'ftoperinit the fluir to build up rapidly 1in lthe magnetic Y circuit and create a sudden change of flux "forthe generation of current in coils 32. As

the armature 1novestothe right and before it has 'become separated from cores 12, `the pin 55frides off lever 46 .and thelatter is ali lowedftdriseand the breaker points allowed to close .u nder 'the influence of 'spring 48. The'wchoklng winding is now'4 inl a closed circuitto yh'old-,the vluxvfor anwinterval andl "retard the relatively gradual changeof flux i which 'would otherwise occur.x Continued movement o-' the armature to 4the fright causes completeseparation of the armature and cores andthe establishment of an air gapiltherebetween and, atk such time, pin 55 engages cam 5,4' and causes thebreaker points to'again open to suddenly. release the flux and'cause the desired substantial change o't flux for thegeneration of current in coils 32. As the armature movestothe left and lbefore again' engaging the cores, pin 55 ridesV off` cam 54 and -the breakerypomts'closeitoV magneticjmaterial so disposed as to be in-k Y capable;y ofy icontactingl withVV said membersl ilus fio

y at'lfanfy "position of vthe armature, whereby Y infonefposition ofthe armaturea magnetic circuit ofvlo'w reluctance from lsaid souice Athroi'igh said* members 1' and "winding" is ffoimed 'and at "another: position ofthe arin'al; ture lthereluctanceof saidgcircuitl is greatly increased, said members being `v spaced one from vthe other@ along .the path `of-m'oven`ient ofsaid karmature and dispose'dboth on the l. means fo sldgfthe" position Eto" another position in a direction at Y rightangles'toltheaxesof said cores to move Acores and bring the recessed' portion op# *8' -IJ {a'magnetogasource of'v magnetic flux',

gtw'ofcores l, extending In parallel relation Aafwavy'.'fromY said sourceand connected at one end thereto,` oneto each pole thereof, a generatingwindingon each =core, an arma-f .y l ture, adapted 4'when inione position to contact withthe other endof eachcore and connectthe cores, said armatur'efbeing recessed between' Sits core',` contacting portions, tand the VTar'mature''out' of engagement with said posite'v one of said cores..Y

' n, 9,1111v aymagneto,"a slidablearmature, two

and;v subsequentlyl disconnected, means magnetic pole surfaces; adapted to be peri- `o-dicallyfconnectedtogether by said armature for reciprocating the armature in'a lplane sub- 1 stantially 4parallel 4with Hsai'd'fA surfaces, and .means for guiding Ythearmature vinto contact means allow-ingthe armature te be drawnv with both surfaces at thev same time, said into close contact with the said Vsurfaces by `the .magnetic attraction therefrom.

10. In ajmagneto, of the type wherein an larmature'movesvinto and out of contact with magneticg'polesto vary the reluctance of a magnetic circuit and ai generating winding is,ISSOClated,withV said circuit in which cur-y rents arev induced by the variation of 'flux therein,y a choke winding-associated with said circuitfand arranged in an electrical circuit rwhich can be" opened .and closed,

` means for nio-ving the armature soy that the 'area of i. contactbetween it and the poles progressively increases Vfromzero to a maximumand then decreases tov zero again, and

means for closing said electrical circuit prior :tol-,contact between 'the armature and poles` and for opening it during the' time of progressive increase of Contact. 11.In-a:ma-gneto,of the type whereinV an varmature moves into and' out ofcontact with magnetic poles to varyy the reluctance ofa magneticfcircuitand-a generating winding` yis'v associatediwithsaid circuit in which currents arelindu'ced by the variation of flux therein, "a choke winding associated with i saidrcircuit and arranged inv an electrical r' v A Y v .means vcircuit] which can. be openedA and closed, for moving the armature so that the armaturev from: said l rupter mechanism.

)area of yContact between yand the poles progressively increases from zero to ai inani-y muin and then, decreases'to zero again, and

means y for closing said electrical circuit" priorito contact between the armature and `poles 'and for opening it duriiigthetime of progressivevincrease of contact and againv closing it .duringthe time of-progressivede'-y crease oficontact.- Y ,u

YW12. y Ina magneto, o f the'I typewherein an arinatiirermoves ilntorandV out,` of contact of a magnetic circuit and agenerating wind,-

vrs

withinagnetic p'oles'tovary the reluctance ingis associated with said'circ'uit in which currents .are induced rby the variation of fluxwtherein, a "chokevinding associated Awith Ysaid circuit and arranged in an elec-. i

trical ci'rc'uitywhich can be opened and closed, 'rmeaiis foriniparting continuous reciprocating motion to the armature. andin such direction that the contact of the. arma ture `with its polesprogressively increases in A V'area to amaximum and then immediately commences todecrease and progressively decreasestofzerm and'means for closing said electrical circuit prior to contactjbetween 'the armature and poles andfor opening itV 'dui'ingathetimeof progressive increase of contact; i

, 18. ,In :a magneto', having a source of'mage netic flux, `primary andsecondary windings associated? therewith vand an #armature ,slidable into .and out of .contact "with the magneticfpoleslof said source andfinterrupterA mechanism including `relatively fixed and movable breaker point'sincluded in circuit with said primary winding to open and close the same, a cam member disposed adj a- 'sie cent the path of travel ofthe armature and mounted for movement at substantially rightV angles thereto, a reciprocating cam follower -movable back andl forth with the armature for engaging and moving said member, and

operating connections between said member and the movable breakerfpointv of the interlhln a magneto, having a source of magnetic flux, primary and secondary'windings associated therewith and an armature recip-r rocable into out of contact with vthe mag'- netic poles of said source and an interrupter mechanism which includes relatively fixed and movable' breaker pointsY with means yieldingly holding them in engagement, an electrical .circuit including said primary windingand breaker points a member disposed adjacent the path of travel of the armature and mounted -for movement at substantially right angles thereto, a cam surface provided on said member, means.

movable. with the armature for engaging said surface and moving said member wheny the armature approaches the end of one stroke of its reciprocable movement, and operating connections between ysaid lmember

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