US1476522A - Ignition apparatus - Google Patents

Description

Dec. 4 1923.

A. A. KENT IGNITION APPARATUS Original Filed Feb. 20. 1920 INVENTOR lfi ATTORNEY.

2 ,f I I w a m In 1 9 Q M a lllmwm WW 2 a 1 W Patented Dec. 4, 1923.

UNITED STATES PATENT OFFICE.

ARTHUR AWL-ran kENror Ambitions, PENNSYLVANIA.

' IGNITION Arranarus.

Substitute is: or. continuation of application aerial Kc. 860,237, filed February 20, 1920. Thin applica- "tldilifllfll. Quechua-80,; 1921?- Serial H0. 525,936.

Be it-known t at-I, Amrrtm A'rwarnn KENT, a citizen-of the United States, residing and tate of Pennsylvania, have invented certain new and useful' lmprovements in is a specification.

. and particularly a variable speedengine such as employed upon mot on-vehicles.

In accordance with my invention, there is provided governor or centrifugal'control structure, forautomatically advancin' -or retarding the instants of occurrence o 'the ignition sparks 'with changes '05? engine speed, characterized by high degree-of simplicity and compactness, b relatively small weight o'rmass, and by elicacy, certainty and accuracy of operation. My invention resides in -features of structure and combination of the character hereinafter described andclaimed. '1

This application is a substitute for or con tinuation of my prior 1 application Serial Number 360,237, filed February 20, 1920.

For an illustration of one of various forms my invention may take, reference is to be had to the accompanying drawing, in which: F ig. 1 is a vertical sectional view, partly in elevation, through apparatus embodying m r invention. r

Fig. 2 is a plan view of the governor structure in position corresponding with rest or low speed.

Fig. '3 is a plan view of the governor tributor structure.

Figs. 9 and 9 are fragmentary views showing the position of the governor spring with respect to a governor plate.

in 'Ardmore, county of Montgomery, preferably of metal, having a central hub 2 Ignition Apparatus, of which the following hig. 10 is a fragmentary section of a governor plate, pivot and weight.

Figs. 11 and 12 show a modification. Referring to the drawing, 1 is a casing,

secured to or integral therewith. The hub 2 is'preferably circular in cross section, pref erably machined or turned, to be supported and capable of rotation in a suitable supporting member, not'shown, having a screw orthe like adapted to enter thegroove 2, allowing rotation of the hub 2 and the parts supported thereb and preventing their longitudinal disp acement within or from "the supportin member. The hub 2 is provided at 3 an 4 with bearings for the shaft 5 driven by and in suitable fixed relation witlrthe engine, the speed of the shaft 5 generally be ng half that of the crank shaft of the engine when the latter is of the four 'cycle or four stroke type. In the example illustrated, the shaft 5 has secured thereto in suitable angular. osition by screw 6 the member 7 havin t e lug or tongue 8 co operating with t ieusual engine driven element or part. 7

The shaft 5 is cheaply produced from round steel blank, stock or bar, as tool steel, drill rod, or the like, procured upon the market, of suitable diameter requiring no machining for its bearings at 3 and 4, though between these bearing portions, by simple and inexpensive operation, re uirin no ac curacy or refinement, it-may re need in diameter, as indicated at 5'. The only other machining required is that at its upper end, by formation of slot 39, or equivalent, for driving the hereinafter described distributor.

By so constructing the shaft, the cost is materially reduced, since turning or machinin to, accurate dimensions is dispensed with, t e only dimensions requiring accuracy being those of the bearings 3 and 4, and these are predetermined by the stock or blank from which the shaft is made.

Rigidly secured to the shaft 5, as by shrinking it thereon, is the main governor plate 9, of sheet steel or other suitable material, which may be stamped from a sheet of suitable thickness.

Near the periphery of the late 9, preferably at equal distances from the axis of rotation and preferably equally spaced circumferentially of the shaft 5, are the pivots with the plate 9. In such position the pivot 10 upon each of which is pivoted .a gov .10 may ente? the hole .103, then the arm 11 ernor weight or arm 11 which, as indicatedJJ'otated toward thejp late 9, whose edge will i in Fig. 6, may be formed ot a stamping from sheet metal and bent into or channel sha e, leaving a gap 13 between the up-'- then enter the channel 13 between the upper and lower checks or flanges 14 and 15.

Whilein the-above described structures er an lower portions orcheeks 1 4 and inthe weight or arm 11 isformed so as to extegrally joined by portion 12 whicln'm the tend around an outer edge of the plate 9, it examp e indicated, does not extend-,-to. the will be understood that the weight 11, particpivotal end of cheek 14, the U shaped form -nlarlygwhen the cheek 15' is omitted, may embracing the edge of the plate'9, which 18 have a lug extending downwardly from the received mto the slot; gap or channel 13. plane of the arm .11 and then parallel with The lower or short cheek 15 of the vveightn. the plane of thearm 11, such lug extendin 11 serves to prevent the weight'ill rising-through an aperturein the plate 3; Sue from the plate 9, and at the sametimeeonmstructure is indicated in ,Fi 111,- wherein stitutes a considerable portion -of the err-,th aforesaid luggomprisestfie'downwardly tire weight of the arm 11. It wilLbe underte ding. ortion 12 ml the i wardly exstood that the-lengths of the cheek-:ltigndrctendjnggportion 15'. forming between the the part 12 by which it is atta-hethto the p arm or wei ht 11' may be greatlynredu c i channel-13%; AsshownunEig. 12, the plate so that in 6 wt it ma s g m yea has ali- -aperture9f having at itsleft; end as a lug hi h x n 9 the pp 9r9'hsuflicient.width in a direction" ,radially oftthe governor plate 9 fonrestrietingthemfromnths ivot 10 w uow issage therearm 01' Weight 11 movement away. 0 ithe lug gmember 15 and having from the plate 9. i

1 .atits rightlend less radial width suiiicient The pivots 10 may be. integral with plate --.t llo f ov ent, therein f the down- 9 as indicated iItFig. an may f d :iwardly extending ,portion 112 of the lug. by partially or incompletely punching theme withthe aveightll inthe position indicated from plate 9. The pivot holes'kTlOl my hs-i in-Fig.;12'-the ,plate Qjsrecived inthe slot weights 11 are sufliciently larger-than pivots '01- channel, 13*,and thgilug o 315 10, as roughly indicated in I igs. 2; 3fjand' ventsfthe weight ll fromv rising from the 10, to effect looseness whereby thewei hts; plate 9.i; In-,this position the weight 11 is 11 slide upon plate 9 while rotating a lit in effect locked {upon the ,plate 9. To remove ivots 10 under centrifugal force; the pivots :the weight, it: is swung counter-clockwise 10 do not determine the plane of .movement o its ivot 10 until ,the lugv portion 12f of the weights but serve merely ascenters eo sint i te ithth id 111;- 9? f about which they rotate while "resting and the a .rture 9, when-it may he lifted from sliding upon plate 9. Obviously the pivots the p ate9, the portion 15 of the lug pass 10 may he on the weights 11 and the pivot ing freely through the wide end 9" of the holes 10' in the plate 9; thereforehothdis slot Sh- When in the position indicated in positions of pivots 10 are included in the Fig. 12, however, the lug portion 15 extends appended claims.= I

e I Y .under the iplate-Qfland,prevents rise of the At its end remote from its pivot hole .10", weight 11.1 Y .s the arm 11 is provided with the pin 17 to :i Accordingly. in .the structures ofFigs. 11 which is attached within the channel 13 one and 12, as well as of the precedingfigures, end of a helical spring 18, whose other end the weight is of channeliorm. for in both is attached to the plate 9 at the 'hole or otherforms of the weight-,fincluded in the apsuitahle means 19. The plate 9 has recesses 18 in its edge for accommodating the springs 18. As shown in Figs. 1, 9 and? 9, the springs 18 are disposed in the plape of plate 9 or plates 9 and 22; or more specifically, the axes of the springs are betWeen the upper side of plate 22 and lower side of plate 9. This disposition of the springs yields compactness of the governor structure which, as regards plates, weights and springs. occupies very small space longitudinally of shaft 5.

To place an arm 11 in operative position upon the plate 9, it is presented thereto in such position that the upper cheek 14, which alone has a pivot hole 10, extends more or less radially outward from the pivot 10 without engagement of the lower cheek 15 these channels being 13 and 13', which re -ceives the plate 9; and in both forms the weight embraces an edge of the plate 9, an outer-or peripheral edge in the case of Figs. '1, 2 and 3, and an edge of an aperture in the case of Figs. 11 and 12.

Integral with each arm or weight member '11'is an inwardlyexbending arm or lug 20 whose end projects into a notch or recess 21 in the controlled governor plate 22, to which is rigidly secured the upstanding stub shaft or bushing 23 'to, which is secured or integral with which is the cam 24, in this example having six faces for actuating the interrupter 'or timer contacts of the ignition system for a six cylinder engine. Through the cam member 24 expended claims, there is formed a- -channel,

portion 15 and the weightifl a gap, slot 01' 'tion of plate 22 and attached cam closing position,

tends a hole through which-the engine driven shaft '5 loosely or freely extends to a suitable distance above the cam member 24, as indicated in Fi 2 1.

In the plate 9- lS: ormed the notch 26, into which projects the lug 2 7'integral with and extending downward yfrom the cone-notch26 in plate 9to allow 'the suitabl'ejordesired de cc of angular movement of the'cam and p ate 22' with respect to thc'plate 9- or shaft 5 In the plate 9 is formed a second notch -or slot 26" through which extends the lug 27" struck and extendin downwardl from the second or controlle governor p ate-22, thelug 27' after passing-through the slot 26 taking or being bentftosuc'h-position as to prevent the plate-'22- f'rom risin from plate 9, the a'rcuate-"len'g'th of {thef -S 0t 26 and the width of 'the" 'lug27t'being referably such as'notto interfere with the imita-' by 27 in 'co actlo'n with tion of rotation 1 slot 26; It will beunderstood, however, that'jlug 27" in (ho-action with slot 26 may not only lock plate 22 against movement awa' from plate 9, but may erve also,.in lieu o 1ug27 and slot 26, to determine or limit the rota-" 24 with respect to plate 9 and shaft 5."

Secured upon the casing1,as by screws 50, is the plate or base member 28, of any suitable material, in thisexample of insulating material. At its cente'rthe member 28 has a hole or aperture 29,"throughi. which extends the cam member '24, and through it, as aforesaid, extends theengine drivenshaft 5.

The cam member 24, of anysuitable shape and of any suitable number ofgfaces, is adapted to co-act with an" suitable type of interrupter or. timer mec "anism.' IFor example, the ignition apparatus controlled by the cam 24 may be of the socalled open circuittype whereof it is characteristic that the interru ter contacts can never remain in circuit c osingposition; and of the so called closed circuit type whose interrupter contacts may, as 'upon stoppage of the engine in certain position, remain incircuit By way of exam lo a closed circuit t of interrupter mecliaiiism is herein illusample, an upstanding lug 33 upon the base Co-acting with the contact is the movable'interrupter or timer contact 34 carried end the arm 35 is provided with the tip or cam engagin shoe 38, of fibre or other suitable materia In the" up er end of the shaft 5 is ro- *vided the 0 set slot 39 into which PI'OJClS the rib or lug 40, in a cavity in the distributor arm 41 of moldedinsulating material or the like. I The rib 40 isatthe bottom of a recess receiving the upper end of the shaft 5'." -Accordingly the distributor arm 41 to tates in fixed angular relation with respect to the engine driven shaft.5, and is not afi'ected by the overnor control.

in Figs. '1 an As shown 8, the distributor arm 41 carries at one end the terminal 42 co-acting with-thestation'a terminals 43, one for each cylinder of t e' en inc and connected to the-spark plug thereo Connected to the "terminal 421811118 contact spring 44 rotatinfiwiththe arm 41-and engaging the cen tra y located terminal 45 in contact with the metallic insert 46', with which communicates one terminal .of the'secondary of the induction coil-vsupplying the high tension 7 ignition energy. )1 V The members 43 and-46 are in the example illustrated inserts molded within the cap47 of insulating material, preferably molded insulating material, as condensite,

bakelite or equivalent.

The cap 47 encloses the interrupter struc ture and distributor, and is held to the base or plate 28 by springs, one of which is indicated at 48, having hook ends engaging thecap 47 and pivoted at their lower ends at 49 to the casing 1.

The casing 1, member 28 and cap 47 form a unitary structure in which are formed on opposite sides of the member 28 two chambers, one containin the governor mechanism described and t e other the interrupter and distributor structure, the shaft 5 extending through the first and into the second chamber. This unitary structure is rotatable about the shaft 5 to different angular positions.

The operation is as follows:

As the shaft 5 is driven or rotated b the engine,-in fixed angular relation wit respect thereto as determined by the setting of the coupling or member 7 upon shaft 5, the plate 9 is rotated at like s d, and rotates the weights or arms 11, w ich with increasing speed move outwardly by sliding on (plate 9 and swinging on their pivots 1O un er the influence of centrifugal force incident to the s d. The outward movemeut is. 0 pos by the springs 18, which may be 0 any suitable strength or dimensions. In virtue of the outward movement of the arms 11, from their position indicated in Fig. 2 corresponding with rest or tion determining the-moment of spark pro duction. In so advancing the plate22 the lug 27 moves with it, but the: extent of movement of the lug 27 and therefore plate 22 is limited by the notch 26 in the plate 9; and plate 22 is locked against movement iiway from plate 9 and lugs 20 by the u 27. V i

0r alldegrees of control movement of the arms 11 upon pivots 10, their upper and lower cheeks 14 and 15 still remain in posi- 1 tion embracing the edge of the plate 9, ai1daccordingly for allspeeds within the desired or operative range the arms 11 cannot be come detached from their pivots 10.

Notwithstanding the movement of .the plate 22 and the cam 24, the distributor 41 remains in fixed position with respect to the shaft 5,'thc angular width of the contact 42 and contacts 43 being suchthat for all positions of the cam 24 the interrupter con-' tacts 34 and 30 will separate while some part of contact 42 is adjacent or'opposite some partof a contact 43. 4

It is accordingly true of the structure illustrated that the distributor is not shifted or actuated b the spark advancing-governor mechanism, ut only the interrupter actuating means, as cam 24. That is to say, the

cam 12% is operated by the governor mechanism independently of the distributor 41, which remains in fixed relation with respect to the shaft 5 and therefore with respect to the main shaft of the engine. By my structure, therefore, the governor is not called upon to shift the distributor, but is required only to shift the relatively light plate 22 and cam member 24.

It shall be understood, however, that as to some of its aspects my invention is not limited to the extension of the shaft 5 through the cam member or the distributor directly carried by the shaft; but-that the shaft may be shorter, and the distributor carried upon an extension upon the cam member 24, whereby distributor and cam are both advanced by the governor.

The structure described, particularly that of the governor mechanism and cam, is of unusually small dimensions and mass, and is none the less certain and accurate in its operation effectively to rotate the cam and so advance the spark with increasing speed.

Should it be desired manually to advance the casing 1, will neverthe or retard the spark, it is only necessar to rotate -the casing 1 and attached arts a out the shaft 5. thereby rotating the interrupter arm 35 withrespect to the cam 2-1, which latter, however, for any ad'usted position of less be controlled by the governor mechanism as above described. For suchmanual operation there may besecured or clamped to the hub 2 an armwhose actuation about the shaft 5 as a center willetfect themanual ad'ustment deand involving characteristics of the enginedriven or governor shaft. are not herein claimed, but are claimed in a divisional application.

What I claim is; p

1. Ignition timer structure comprisin a rotatable governor plate, a weight pivote to said plate and having channel form embracing an edge of said, plate, and-a timer cam moved by said weight.

2. I nition-timer structure comprising a rotata 1e governor member, a weight embracin an edge of said member and movable with respect thereto, and a timer cam moved in response to movement of said Weight. i

3.1,I ition timer, structure comprising a rotata le governor plate, a weight sliding on said plate and havin channel form embracing the'edge of sai plate,and a timer cam moved in response to movement'of said 4. Ignition timer structure comprising a rotata le governor plate, a weight loosely scribed. Certain features herein described a pivoted to said plate and sliding thereon,

said weight having a member embracing an edge of said plate, ands. timer cam moved in response to movement of said weight.

5. I nition timer structure comprising a rotata le governor plate, a pivot on said plate integral therewith, a weight loosely engaging said pivot and sliding upon said plate, and a timer cam moved in response to movement of said weight.

6. I nition timer structure comprising a rotatable governor plate, a'pivot on said plate integral therewith, a weight loosely engaginn' said pivot and sliding upon said plate, said weight having channel form embracing the edge of said plate, and a timer cam moved in response to movement of said weight.

7. I ition timer structure comprising a rotata le governor plate, a pivot integral therewith and consisting of metal thereof displaced to one side thereof, and a governor weight loosely mounted upon said pivot and sliding upon said plate.

8. A pivotal weight for a governor of ignition timing structure, comprising cheek members, and a member joining said cheek members at their edges remote from the axis of rotation of the governor.

as v .1

nition timing structure {comprising J' at hq ne ssesii east t esfirm 011 n p e d.ze kltlnb liv m- ,1; A we ht assess m g sm wrweprs r r y s aqhsethess eeansg mzi,i ir iesd w h saiw -est e nesrmme ie of said cheek members "only ind"' disposed adjacent Fri-ling: WI

A migh i mgev rees si itienn s ai emn ii l i il b fs o y g nds nte l" vi. :ee'fi s'rfls theiredgeagn i last named membeg 'sanihatgm nrhsffor pivotingtsaidjveijht, fan d-gan actuatingiarm on said one ofisa' ,cheekmembersonly; a

members overlying eachother and 'oindiat their edges, means for pivoting..-sai weight, an arm on one of said cheek mernbers only extending therefrom adjacent said pivotal means, and .means for connecting a spring to said weight at a dist-ance from said piyggtal means. i,

16. Ignition timer 4 structure "comprising a shaft, a timer cam, governor plates secured, respectively, to said shaft and cam and lying ad'acent eachother, a weight pivoted to one 0 said plates and reacting on another of saidplutes tocause angular movement of said plates, through structure comprising an arm on one of them engagin in a recess in the other of them, said sha 1; extending freely through said cam and the plate to which said cam is secured, and a distributor carried upon the end Ofsaid shaft.

17. Ignition timer structure comprising a shaft and a cam, a governor plate secured to one of them, a oircumferentially extending governor weight pivoted to,said plate and embracing the edge thereof for eifecting relative movement between said camand said shaft. and a spring secured to said piate'and to said weight.

18. Ignition timer structure comprising a shaft and a cam, an axially short governor rotating; in fiired p fsaid plates, and means on the ot comprising governor eachother and secure respectively, to said shaft'fand cam, a governor wfeight pivoted to oneof said plates and movable with respect th fq qfor effecting adjustinnt of said cam with respect to said shaft, means holding the latejsecured to said cam against movement on 'itudinally of Saidshaft, said shaft ext rqugh a dz m n er cured thereto, and a distributor carxged by sition sflsseeeme I v c i itlon'ti mer structure comprising an anall -sh m,- r rsor s mpr governor pats es ais emqr e a e we; otjar, disliatt seemed to one of said plates; aftiinefcam 'secu'rea ta another of s91, v eletes and mi ht, sanctum {q news-1e; a sqla'r ms e ng t'qi i Pl t c n l f smsi fhtsiembsr re e ofislaid'plates c omprisi" parallel cheek been;i isez am see edge meenapi g ngiqm 5, art a li. cheek n n 1 I 01 1i; n ging n of W1 ernordates. 2- it a t ng s ric comprising a lq'ta a, l 'g r 'in pla es erne weight sens s; th i te s A ses es P- sidesjof saidfplatef an extension on ater said :cheekmeinbersdpiyoted to said A t. I I v 1 Messed-e t e r 24m, wer y 811151 weight inYesponsi to 'changfui 's eed, said Weight being-.d'etachable-frorn sailfpiyot only upon movement of saidjfweighftoposition where ,th'elot ercheek thereof" is head said plate. 21 1 gnition timer structure comprising a rotatable gove nor plate','a governor "weight pivoted to said plate,'a second plate lying adjacent said first plate, anengagmg connection between said weight and said second plate for effecting angular adjustment beta een said plates, a timer camsec ured to one ofsaid plates, a notch in the 'e'd e of one of her project- .ing into said' notch for limiting relative movement of said plates. v22. Ignition timer structure comprising a shaft and a timer cam, governor plates ly ng adjacent each other and secured, respectively, to said shaft and cam, a governor weight pivoted to one of said plates, an engaging connection between said weight and the other of said platesfor effecting adjustment of said "cum with respect to said shaft in response to change in speed, means positively limiting relative movement of said plates in a direction longitudinally of the axis of rotation, and a distributor terminal rotating in fixed angular relation'with said shaft.

23. Ignition timer structure comprising a rotatable overnor plate, a weight pivoted to said p ate, a spring attached to said weight and to said plate, said weight having! a portion between its pivot and s ring at tachment embracing said plate, an a timer (plates lying adjacent cam moved in response to movement of said weight. v 24. I nition timer structure comprising a rotatab e governor plate, a weight comprising long and short cheeks 'oi'ned' to each other and embracin said p ate, a pivotal connection between tie longcheek and said plate, and a timer cam moved in response to movement of said weight.

25. Ignition timer structure comprising a rotatable governor plate, a weight carried thereby and movable with change of speed, a second plate moved by said weight, a member fixed to one of said plates and directly engaging the other permitting relative angular movement and preventin separation in a direction longitudinally 0 their axis of rotation;

26. The combination with ignition timing structure, ,as a cam of a governor therefor comprising a rotatable governor plate, a piv oted weight, and a sprin extending substantially parallel to said said weight, said plate aving a. form effecting free space adjacent its edge for said P I 27. The combination with ignition tim ing structure, as a cam, of a governor therefor comprising a rotatable governorp'late having a reces in its edge,a pivoted weight extending toward said recess, and a s ring disposed in said recess in the plane 0 said plate and attached to said weight, 1

28. The combination with ignition" timing structure, as a cam, of a governor'therefor comprising a rotatable governor plate having a recess in its edge and having a-hole adjacent said recess, a weight pivoted to said governor plate and extending toward said recess, and a sprin disposed in said recess attached to said weight and engaging in said hole in said plate.

29. I nition timer structure comprising a rotatable governor plate, a weight carried thereby and movable in response to change of speed, a second plate upon which said weig t reacts, a timer cam secured to one of said plates, one of said plates having a mem ber projecting through a slot in the other for locking said plates with respect to each other in redetermined position longitudinally of tieir axis of rotation.

30. Ignition timer structure comprising a rotatable governor plate, a weight carried thereby and movable in response to change of speed, a second plate upon which said weight reacts, a timer cam secured to one of said plates, one of said plateshaving a member projecting through a slot in the other for locking said plates with res ct to each other in predetermined position lfngitudinally of their axis of rotation, and a projection on one of said plates engaging in an opening in the other for limiting the relative angular movement of said plates, said ate for controlling "'31; Ignition""timer structure comprising rotatable governor 'plates lying a jacent each other, a weight having pivotal connection with one of them and movable in response to change of speed to move another of said plates, a cam moved by said other plate, and means for" limiting relative angular movement of said lates comprising a member. independentoi said pivotal connection, said member attached to oneof'said plates and engaging in a'notch-"in the edge of the other.

32. Ignition timer structure comprising a shaft and a timer cam,sheet metal governor plates lying adjacent: each other and secured,respectively to said shaft and cam, a plurality of weig ts pivotedto one of said plates and each having a"channel section embracing the 'edge of one of saidplates,

resilient means .opposinganovement of said weights, the other of'saidplates having a plurality of hotches, and"hig s"integral with saidfweights enga e -in ane notches for efl'ecting relative rotationof said plates. f 33. Ignition timer structure comprising a rotatable governdr plate, 'a sheet -meta weight: iv'ot'ed to said plate' extending around the-edge of said platen-and a timer cam moved by said weight.'"- t Ignition timer structure comprising a rotatab e' vernor '-plate "-"a"sheet metal weight pivoted thereto'andj'embracing the edge thereof, see-cons plate, of sheet metal having a notch, a lngintegral with said weight engaging in said notch for ellecting angular adjustment of said plates, and a timer cam secured to one of said plates.

35. Ignition timer structure comprising a shaft and acam, sheet metal governor lates secured, res cti'vely, to said shaft an said cam, a weig t pivoted to one of said plates for shifting said plates with respect to each other, and a spring secured at its one ,end to said one of said plates'and at its other end to said weight at its end remote from its pivotal connection to said one of. said plates.

36. Ignition'timer structure comprising a rotatable governor plate, a weight movable under the influence of centrifugal force, a timer cam moved in response to movement of said weight, and a spring controlling said weight disposed substantially in the plane of said governor plate.

37. Ignition timer structure comprising a rotatable governor plate, a weight movable under the influence of centrifugal force, a timer cam moved in response to movement of said weight, and a helical spring controlling said weight and having its axis substantially in the plane of said plate.

38. Ignition timer structure comprising a rotatable governor plate, a weight movable under the influence of centrifugal force, a timer cam moved in response to movement of said weight, and a helical spring controlling said weight and disposed beside and extending substantially parallel with the edge of said plate.

39. Ignition timer structure comprising superposed governor plates, a weight carried by one of said plates, a timer cam moved in response to movement of said weight, and a control spring disposed beside and extending substantially parallel with the edges of said plates.

40. Ignition timer structure comprising a shaft and a timer cam, governor lates lying closely adjacent each other an secured, respectively, to said shaft and said cam, a movable weight in the form of a plate on the same side of one of said plates with the other of said governor plates in substantially the same plane with said other of said governor plates, said weight loosel pivoted to said one' of said plates and sliding thereon, means on said weight en agin said other of said governor plates or e ecting angular adjustment of said cam with respect to said shaft, and a s ring attached to said weight and to one 0 said plates.

41. Ignition timer structure comprisin a shaft and a timer cam, governor lates ying closely adjacent each other an secured, respectively, to said shaft and said cam, a movable weight in the form of a plate on the same side'of one of said plates with the other of said governor plates in substantially the same plane with said other of said governor plates, means on said weight engaging sald other of said'governor plates or e ecting angular adjustment of said cm with respect to said shaft, and a weightcontrolling spring disposed substantially in the plane of said plates.

In testimony whereof I have hereunto affixed my signature this 28th day of December, 1921. 1

ARTHUR ATWATER KENT.

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