US1634584A - Actuating means for magnetos - Google Patents

Description

July 5 1927. n K A. C. KLECKNER ACTUATING MEANS Fon MAGNETos Filed July 2. 1924 2 sheets-sheet 1 Jul 5 1927.

y A. c. KLECKNER ACTUATING MEANS FOR yMAGNETOS Filed July z. 1924 2 Sheng-sheet 2' Patented July 5, 1927.

UNITED STATES 15.634584 PATENT OFFICE.

ARTHUR C. KLECKNER, OF RACINE, WISCONSIN, ASSGNOR '10 XVEBSTER ELECTRIC COMPANY, OF RACINE, WISCONSIN, A CORPORATION OF XVISCONSIN.

Ac'rUA'rING MEANS ron MAGNETos.

kApplication illed July 2, 1924, Serial Nm 723,801.

My invention relates to actuating means for magnetos of the oscillating `armature type, the chief purpose of the invention being to insure a full spark current at all engine speeds by generating the spark current on 'the initial movement-fof the armature rather than on its recoil movement. ther objects of my invention are the use of a tripping mechanism having a cooking feature combined therewith to produce a quick current generating impulse; the yprovision of an improved form of tripping tinger, and the provision of improved means for locking the armature until it is released for its current generating movement.y

In the usual form of oscillating magneto, the armature is brought to a cocked position against spring pressure, and the armature then is allowed to snap back to its normal position, thev spark current being generated on this quick recoil movement. It has been found, however, that athigh enginespeeds, the cooking or initial movement of the armature is so fast and is followed so soon by the quick recoil movement, that insufiicient opportunity is allowed for the current necessarilygenerated by this cooking movement to die out before the newly created spark current onthe `recoil surges through the coils in 3 the opposite direction. As a result, the spark current has to build 11p-not y'trom a zero value-but from a value on the other sider of the zero line, corresponding to a cui`- rent flowin the opposite direction. `For this.

Il reason, the spark current cannot build upto as great a peak value during high engine speeds asfat slow or moderate speeds.

vI depart from this practice by using this initial oscillation of the armature,. correspending to the cooking movement iny prior practice, for generating thespark current,

and use the recoil merely for returning the armature to its normal position.

mature assumes between ring strokes ot the engine, and isof considerably longer duration thanthe actuating period vof the mag.- neto. Thus, this, entire time. interval be-r tween the recoil movement of the armature for one engine cycle and ,thek initial movement of the armature fork the succeeding engine cycle is allowed for any currents to die out before the spark current is generated.

The `foregoing and other objects are set forth more in detail in the following de- Fur l This non' v mal position is they state of rest that the arscription of a magneto embodying a preferable adaptation oi the invention, and are disclosed in the drawings, wherein y Figure 1 is a side elevation of a single cylinder internal combustion engine provided with the magneto oi. my invention;

Figure 2 is a plan view of the magneto; Figures 3, 4, and 5 are vertical transverse sections taken respectively on the lines 33, 4-4, and 5--5 of Figure 2;

Figure 6 is a view similar to Figure 3, but showing the parts in the position they assume at the completion of the tripping stroke; and n i' i y Figure 7'is a view .similary to Figure 3, but showing a modified i'orm of tripping finger.

The engine 10 shown in Figure 1 is provided with the usual reciprocating valve rod 11, the magneto 12 being secured to the engine casting by means of a bracket 13 on the magneto and so arranged that the stationary and movable,,electrodes 14; and 15 extend through a suitable aperture in the engine wall to the combustion chamber. A plurality of U-shaped magnets 16 are superimposed and ttedtogether to it'orm a unit.v the v legs of which are provided with opposed E-shaped pole pieces 17, the middle bars 18 of the E-shaped pole pieces carrying the coils 19, in which the sparking current isgenerated. The end terminals of this pair of coils are connectedwith the electrodes 14 and 15. Between the pole ypieces 17 is rotatably mountedan armature 21 having a substantially X-shaped cross section.

In the normal position shown in Figure 5,

' the magnetic path between the pole pieces leads through the middle bars 18 and across the opposed arms 22 of the armature. V'Vhen the armature is given a short but quick clockwise rotation, the lines of force along thispath are stretched and iinally abruptly broken as the arms 22 of the armature move out of proximity to the middle bars 18, and the other arms23 of the armature, as well as the arms 22, close paths through the upper and lower bars of the E-shaped pole pieces` As pointed out in the introduction to the specification, this currentv generating movement of the armature is made on the cooking or initialvmovement of the armature rather than on the recoil movement. The means for effecting this sudden forward movement of the armature oscillation will now be described.

The armatureslmft22 isextendethbeyond rod B9 `e'1i, g;agesy the end of the; push `finger its bearings at one end ofthe magneto and 28. -As the'lvalve'rod l-l in its reeiproeation there provided With a Cam dise-Q'Tfthemoved-Ato the left, the elamp 37 Will cause funetioir ot' Whiehlushallepresentlydescribe: similarrinorveinentz ot' :the: tripv tingen 85, A. reeoil springris eoiledhabout;this,:shaft apressingthe'endv of. the push rod 3) against 22 having; one end secured by pin 25 to the push finger Q8. Because the armature the cam dise 2T and the otherendasecuredfby is. locked.aagafnistfrotation by the rollers 30, piu Q6 to the magneto frame. The tension the push rod Will yield against the pressure of this spring' normally/'tends to 4return theA1 ot' the" spring*- -(J luntil the forward extension armature to its .normal position indicated in 42 of the trip finger contactsv the push iin- Fiaiure 5 and.thereyieldingly-hold iti""'l.`li`g gerQS.` Sinne thisestablishes a-pos' ire con-A arniature shaftfmis' alsoi'provideditlra; neetion-betweentheyalre rod and-'the push push .tingerQSgzwhieh I ,shallpiesentlyfldeif finger;Vv there is sutliei'ent I`rotarytorce im-` seribe. As shownin Fig'ure, thezeanrrdise parted' to thearmature shaft-Q2 to cause 2T is providedwith:'diametrieallyropposedr the5 rollers 'BO to ride out ot' the delnfessionsdepressions 29intoWhiehf'itrolleis"30 'arA 29 against the yielding torre or the springs ried on the endA of Aopposed'iplungieisel 33', freeing the armaturerlfrom all meehani'eal slidably1 journalled in bearingsBQ` entend-ing resistance :to turningvr-)ther than the"inei rearwardly from the magneto AJframe: dentaldriction-ot thearinat'ure b ir-ings and Compression springs 33 are inserted bef the rollersO;E tween the outerfbearings-BQ and W'ashers'se- Itwill-be noted, however, that `by the timesy cured to the plungeis 3l for urging the roll-V the "extensionl 42 contacts tlie push iingerQS." ers 30 radially against'the periphery of the the lpush rod BQVWill have assumeda cocked camdise 27... The forward or Cloelolvi'seendsH position?because-of the Ecompression ofthe o1 thedepressionsQSareextendedoutwardly Spring 40.1* As 'soon as the eaindise 2T is asat Set to stopv the armatureagainsticounterunloekedfpthe 'cocked' push r'od will 'shoot clockwise rotation 'past 'the normalaposition forwardly eonsiderably' faster than the timed to which it is returned by theboiledspring travel-'ofthe trip' iiigei'5-ii'ri1lia1fting a `quleli 24C. Tlile the depresgions-QQJtend-to hold rotation to the armature: `Thearelthrouglr the dise 27 Tagging@ -Cloekwise -1-0mti0n-1gr Whielrthe armature-is thus rotated may be predetermined torsional stliainon'thetarmaedetermined by adjustmentol the' cap 'sferen' ture shaft vWill cause the Vrollers to `ride-outl lsffwhichfas the Ypush linger-28 "IOl'vk of the depressions" 29 "againsttheyielding" pushes the pushirodl-Q dou-inwardly and outpressurept the springs` 33." I shall} next` of engagement With'the pushtinger. describeV 'the rmeans' employiorunloeking; At the proper time an arm it on ythe push and rotating the armature; fingfer'QS Contacts' the* electrode arm i',fro

Disposed in horizontal 'alignment' with the;, tating fthe* electrode sha'lt 48. the opiliesite push linger28 is a trip-;'f i1iger"35 piyp'te'd end^of which Carries `the inovable electrode at 36 'to d. Valve/fwd' Clamp-3,7 which is pig;` l5, pulling? the latter Vaway from the*sta` idly'lseeuredito .the Valvefrodl, as shown'- tionary-'eleetrode 14 Or'v the purpose ot in Fig'ure l. LAn eceentricsleeye' may drawing out af'sparlfpas is usua-llin low ten-V be interposed between 'the Vpivot 36 "and `thel sion' fmagneto equipment. trip finger 35. .'Bythe :operation vof arsuitf AS" soon Vas the pushirod- 39 swung,r out` able handle, notl shownthis*eccentricLsleeye. Of "Engagement with the push-tiner the may be rotated't advance' or retard the spring 24 snaps the armature"back` to fits spark. The tripting'er-B is proyidedlwith origina-l positionuhere the rollers 30 'again aligned longitu'dinally,disposed bearings38,` I lock the armature shaft against'rotation:' It Within which is ieeiproCa-lly1 journalledia; Will` tlius be seen that therecoil-movement et push rod 3.9,"Whiehis normally kiirgedjaway:i th Spring' `24e is not yutilized for;l any Current- Afrom 'the pivotY 36 by a' eompression'spring' generatingpurposes7V but `merely to return1` l() Whiclrholdsthe shoulder4l of tlieA push." theiparts to their normal positionin readi-v rod against one of the bearingseS to limiti ness forit-he next oscillation: r The *entire relative moyementpof thepush: rod andtrip" time intervalbetween the recoil' atioir ot' the" finger.`r The trip'tingerfis provided xvith'an.: spring` 24 and-the. trippingof thepushfiin#A extension :4Q Whielr normall) yext-ends"'longi ger-28` in thezsuceeeding engiueeyele is althe bottom ofya'ndzto withinI a short distancelow'ed',A during Wbiehf'timm-of courseg'all 'eure from the' end of. the. push r`od-39;. rent'generated'in the coils Willhave died'out."

The "push ingferQSis provzidedtwithanVVlienfthe 'armature'is again tripped, the` sparkfcurrent'will buildup from a: zero value; Wardly extendingeapg'screw"44. A strongr and' n'otrom4 a' value! on 'the :other side of looped springel disposed."about`4 the' pivot." the`zero"lin.

36 tendsto spring'the'triptiingen35 up-'; In Figure 7 I have shown a modiiedform" Wardlyso thatthe cap'selew'eti-.t4 contacts the' of tripnger, in Whieh'the positivelyxmoved upper surface' of the push "rbd-'39. As sh'owvn7 trip` finger 135" does not. itself Contact .the

in Figure 3, the forward edge of thepushMpush fmgerQS, but "positively engages "the 130 Les-1,584

push rod 39 after the latter has cocked the yielding spring 40. In its detailed construction, the push finger 35 is hollowed by a bore within which reciprocates the rear end of the push rod 39', a positive stop for the shoulder 41 on the push rod being afforded by a cap 49 threaded over the open end of the push finger 35. The spring 40 is cocked while the shoulder 4l travels from the end of the cap 49 to the open end of the push finger 35 which then positively pushes the push rod 39 forwardly to trip the armature.

Having thus described my invention, what I claim is:

1. The combination with a magneto having an armature rotatably mounted therein and a winding therefor, forward and also backward rotation of which armature gen-- erates a current in said winding, of a pair of electrodes, a push finger on said armature, a trip finger, means for moving said trip iinger, a spring pressed latch for locking said armature in a normal position, a push finger engaging element movably mounted on said trip finger, a spring disposed between said element and said trip finger adapted to be cocked by movement of sald trip finger, said ktrip finger after said spring is cocked moving said push finger to unlock said armature and permit said spring to snap said element for rotating said armature forwardly,

means for returning said armature to its normal position, and means for utilizing the current generated in sa1d wlndin on sa1d forward rotation to produce a spar between` said electrodes.

2. The combination with a magneto having a winding and a rotatably mounted armature, of means for oscillating said armature comprising a driving element having a timed movement, an impulse .mechanism interposed between said element and said armature for rotating the latter forwardly, means for rotating said armature back- Wardly to a normal osition, and a. spring pressed latch for releasably locking said armature in normal position.

3. Means for actuating the armature of an oscillating armature magneto comprising a spring for bringing said armature to a normal position, a cam disc having depressions therein and secured to said armature, spring pressed means engaging said depressions when said armature is in normal position, a timed driving element, and an impulse mechanism between said element and said armature for rotating said armature forwardly against the force ot said spring.

4. The combination with a magneto having a rotatably mounted oscillating armature, of a driving element having a timed movement, a push arm on said armature, a trip finger mounted on said element, a push rod slidably supported on said finger for engaging said push arm, a spring between said rod and said finger, a cam disc having locking shoulders thereon, a spring pressed roller engaging between said shoulders for holding said armature against rotation to cock said spring, means on said finger for unlocking said locking` means, and a spring to return said armature to a normal position.

5. In an oscillatory magneto, the combination of a rotary armature having a normal position between firing strokes of the engine, a grooved cam disc fixed. to rotate with said armature and a resilient roller engaging in the groove of said disc to lock said armature in normal position, a pair of circuit controlling lmembers, mechanism for imparting a current generating impulse to said armature in its initial oscillation away from said normal position, and means for separating said circuit controlling members during said initial oscillation. i

6. In an oscillatory magneto, the combination of a rotary armature having a normal position, resilient means to lock said armature in normal position, camming means to cam said resilient means out of locking position, a pair of circuit controlling members, means for oscillating said armature away from said normal position, means for oscillating said armature back to said normal position, and means for separating said circuit controlling members during the oscillation of said armature away from said normal position.

In witness whereof, I hereunto subscribe my name this 17th day of May, 1924.

ARTHUR C. KLECKNER.

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