US1338758A - Impulse starting mechanism and method of operating the same - Google Patents

Description

M. TOST. IMPULSE STARTIING MECHANIM AND METHOD OFOPERATING TH E SAME.

1 PPLiCATION FILED JAN. 2-, I918. I 1 1,338,758. Patented May 4,-192 0.

A TTORNEY the internal ronihustion oi AMERICAN BOSCH MAG 193013 9F NEW YORK.

E TAREING llIECIZ- Application filed l'anuzii'y id, 1913.

1 '0 (/[7 10/20/12 it may concern:

Be it known that 1, HA Tom, 11, SilbjQCL the Emperor of German troih in tho county of h'lichig'zin. h

vo invented useful improvements in Mechanism ind L s E aine; and I do h 'ehy dee ing to be a fulh clean, and e ct dose-Bi of the invention, such will eiuihle oboe skilled in the art. toivhich it zippoi'tniiis to nizilieiind use the same.

In general an impulse stzi mechanism has driving and driven men eonneoted respectively to rotary driving driven units and connerted each other by an impelling spring. The impulse StLLl'lk ing mechanism also has locking iii-ecluinisni for holding the driven unit against nit-lit on While the driving unit rot: Line; at slow speed in starting to thereby stress the inipelling spring upon relative angular displacement of'the units, and it also has releasing mechanism for releasing the looking mechanism at a piedetormined angular position of the driving unit to thereby porniit the iinpelling spring then ln asst, impel the driven unit throu h no. sp n ate angle and a Y :r UOHlpfliiil'lY i l even. though the driving; unit time of release he rotating: at :it rest.

.ltis sometimes necessary to inipelling inoveinontone or more m instance, in the (use of :1 magneto ne w it is a riated for ignition PU. sometimes happens that the engine not; started into operation under its own power by the first spark, even though the i'zylindi are primed and the spark generated in inmolling movement. would ordinarily h: i'slzu'tory for ignition. A second spark then requireih or a third or even 21 fourth Inay'be required under extremely adverse vonditions, siu-h 21s i'old cylinder Walls low compression. improper mixture" high static friction. etc. To turn the engine over to another tiring;- point involves the rotath of 720 for the same cylinder or 180 tor the next cylinder in the nine order 0" ll toiii'eyliiuler engine wherein, as usual the engine operates on the si-cyele plan.

This method of repeating the impeliin Speeilwotion of Letters ffzltent.

illtlfliOu heietoiore prior inc-i ii ot or may he 'esti out turn"' at x on may he disconnected by means of u r leasable coupling arranged in the mechanical oonne 5 between them and preferably the (RH is arranged on the rh'iving side of th, pulse staining iiletilitlilifill so that iism and i l" f 'ven unit are disc unit when lIil1-- ms, n

1 rest sed.

fired 1' oper fiitl ntl v on mu n nniuloining the on;

position. the Inn; lo being; return i. tnno to its a u nosition IUZUIHQUZT;

{.fklltiaiiViOI'l duixn 1e subsequent inipellii' movement.

Although in rini returning the driven unit angular relation W11 V a. unit in the no duced by th the driven u e i x r n I ,t the norm: l fiHQC oi? rotation. iiinouisin i prefer to iesivress tho impelhng spring siihseouent to the turmo movement of ti 'hiven zill 1) both in the s though it is possible to di ]Kll()(l oi opomtion. 'hus "when a ooupli h [H installed between he. impuise start-mg mechanism and the engine, to disconnect that mechanism and the magneto from the en gine in order to retire a cylinder, I prefer to first turn the magneto against the normal direction of rotation to its angular posi tion for maximum generation, and then to restress the impelling spring in returning the driven member of the coupling for re connection to the other coupling member. In this restressing period, the magneto is held in its returned position by the locking mechanism of the impulse starting mechanism, and when the spring is restressed and the coupling members reconnected, the mag neto and engine are maintained in their predetermined angular relation, pending the operation of the releasing mechanism, as a result of the resistance of the engine to angular movement.

This invention not only comprehends the foregoing methods of operating the impulse starting mechanism in repeating the impelling movements thereof, but it also comprehends suitable apparatus for carrying out those methods, in all suitable organizations including driving and driven units and impulse starting mechanism therebetween.

In the accompanying drawings illustrating suitable apparatus of this kind in application, as an example, to an engine organization,

Figure 1 is an elevation showing in section the magneto, the impulse starting mechanism therefor, and the coupling installed, as an example, on the driving side of the impulse mechanism; Fig. 2 is a side elevation of the coupling on an enlarged scale; 3.is a top view of the coupling; and Figs. 4, 5 and 6 are diagrammatic views indicating the relative positions of parts of the impulse "starting mechanism and the coupling, during the restless-ing period While the coupling members are disconnected.

In the drawings, the engine 1 is of the -1- cylinder 4-cycle type driving a bipolar magneto 2 through like gears 33, the releasable coupling 4, and the impulse starting mechanism 5.

The magneto and the impulse starting mechanism therefor are identical with the disclosure in the application of W. E. Schwarzmann, Serial No. 192,461, filed September 21, 1917, but, like the engine and the coupling, may be of any type suitable for employment in accordance with this invention.

The magneto has an armature 6 rotatable on an axis extending along the length of the arms of the magnet 7. The impulse starting mechanism is inclosed by a hous ing .8 at the outer ends of the magnet. The driving member 9 and the driven member 10 of the coupling are fixedly mounted on the coaxial shafts 11 and 12,, and the spring plate latches 13 are pivoted to the driving member so that they can be moved i'rom engaged positions connecting the two coupling members, as shown in full lines in 1 1g. 1, to the disengaged positions shown in broken lines in Fig. l for disconnecting from the engine the magneto, the impulse starting mechanism, and the driven coupling member. The Hat springs 14 tend to hold the latches in either engaged or disengaged positions.

The driving member 26 of the impulse starting mechanism is fixed on the shaft 12 and carries the impelling and butler springs 15 and 16, and the interposed abutments 17, together with the releasing cams 18. The driven member 27 of the impulse starting mechanism is fixed on the magneto shaft 19 and carries the safety cams 20. The pressure applying arm 21 is loosely journaled on the driving member of the impulse starting mechanism and extends through slots in the driven member to turn therewith. The releasing cams, the safety cams, and the outer ends of the pressure applying arm coact with the locking pawl 22, which may be turned by the handle 23 between its locking positions shown in Figs. 5 and 6 and its raised inoperative position shown in Fig. 4.

The impulse starting mechanism operates as follows for rotation in clockwise direction as viewed from the right in Fig. 1: The driving and driven members are fixed on their shafts in such position that one of the safety cams 2O first comes under the pawl. followed by one end of the pressure applying arm 21, and then by one of the releasing cams 18. At slow speed in starting, the pawl 22, when in engaging position. rides smoothly on the safety cam and remains in position to engage the pressure applying arm. At this position the arm, and therefore the driven member fixed on the armature shaft, are locked against rotation with the armature poles substantially bridging the spaces between the field poles, that is a little prior to its angular pbsition' for maximum generation. Likewise the mechanical interrupter 24 is near its position to start its interrupting movement. Further movement of the driving member of the impulse starting mechanism causes the abutments 17 to compress the impelling spring between them and the pressure applying arm, until the pawl 22 is lifted by one of the releasing cams 18, or by the handle 23, to release the spring for its impelling movement of the magneto armature, the engine being so timed that one of its cylinders is at its firing point when the releasing cam releases the pawl. The impelling movement causes a suiliciently high speed of the armature irrespective of the speed of the driving member at the time, and

be of the impulse staitiiw niacin the magneto armature {RC3 vpcsilzm tis to lliifll iliey wa s Coupling men; iei's zircili-en discunnected. by

back in an unti-c-loclm'ise through an appropriate sngle to generals sparks are iequirscl.

in accordance with the invni desired, u'liile maintaining fixed angular pOSllJlOIL 'vl. suc'lium; ills begini'iingof their pswsi' u to the time n eleasing can the pawl 22, as inilicziieal in i ina 'netq is in its posit iinum gens'ntinn (luring; size subsequent inipslling'movement by the ping th 1 stresssil. After each unsuccessful impelling of the enmovement, the angular positions gins, the coupling,- zinil Uri uncnsnged, b the pres indicated in i, lie

n this spring, as

i. mleasing the lil'iCilQS 13 am the i be]: of the (:nupling, ingeijliei' new armature and both 311k the impulse starting-niecl1zinisi'n,

it locked against rotation by the pm ina'gnetn zii'iii:1t11i'e,tli1ls bsing returned iis position foifiinuximum gunei-ation. psi-ls than have the angular pnsitimis in caterl in Fig. 5., aml the armature. the pressa a; w

sure zipplying arm illkl film s21 l st 0 locked in their pnsitions by ilis piu'l. mm'

upan turning the driven i-nuplin g' inenilvr l in the nppnsileilii'sciinm film; is, in 'ijlllj normal (.lQClKWlSE (lu'ectlnn cf i'otaiinn. ill d driving member 26 of time iinpuls g n mechanism is t n-nail and Clan ii'npel in spring 'esti'esss l betweenihe ulmtmen l and the pressure applying arm until the, releasing cam 18 is again at or near iliu position at \vliia'li it sin ts tn li'li tin). pziu'l. as ingliciiieil in Fig. (3. The driving member of the wupling will llwn lie in pnsilinn milie latches 13, to reconnei the magneio to the. engine. Tallinn this has been (lime. the impelling spring is held in fully resti'esseil condition as a result of the resistance of ills engine to turning. To repeat tlie iinpelling movement. til? impelling springis then leased by i'ziisingz' tla'e pawl 22 b v'znszins vi the handle 23,- Wliei-eupnn ilie magneto is impelled to generate unoilisr spark in ills same cylinder.

on in he uuiis. \(lliUll consists in discomwriinq t This opera own power, tluv my m i' v. lilil) innpei'ui'iic p0siengagement with the lam-l: by 7! i handle "23. 01 the pawl will in: 1 .1. 'i l il. inioun in tum; pos um '7 if; (AIDS 24L if the pawl slioulil Mon to engage ills pi'sssme apply i 11 1 the iinpellii IDOYQZZEP 2231i E 1".) i'essing the inipvliin spi'ii g the impulse starting: meclu :inisin while maintaining the (liii'iiigi unit i i, and l'illfillp' A the impelli i impulse s ineclmni i EOiiiifa dilating and (ll'ivsn iii-1's nuieii which .7 sis in (llSCODllPClllllfl: film from QfilQl: otlie mining ilu: driven ",](l L 52' clix inipizllingr spring i in znevl unisin while n neciiiu; iesie we nieimnl in making the iinpvlling movement 0i an inipulsv stm'liingr insnliz nisni arranged between'i'oizn'y ili'ning unil ili'imn units imiu izHll other. turning tlw illl lll llllli is bring: it in 2 'iroilel'vi'minuil angular elation mil-1 respect in the driving unit.

Z'QSiE'PSSlHgI i'llvimpvlliug spring 0i ills im pulso starting ll)\l nnism, reconnen ng ills 11 units. and illlllil l'. Yule, l impslling spa-i l. iluhmeiiimi of ropes-fling lie impellin n'un'einmii' of an impulse slzii'l'iugnievliunism arranged between X()i1li' driving and driven The i haul of i'spe-ating ills lIHUPlll7l 12 movement of an impulse starting" niei-lmnism arranged bum-wen iy driving and driven i'liivli' nousis in iiis'nnnnuiiug 'tlio om uzii'li lulu-i3 iui'ning i'liu (ll'lVPl'E. ii, a pi'siletoi'niineil nngulzu: i3

relation with respect to the driving unit while maintaining the driving unit at rest, restressing the impelling spring of the impulse starting mechanism, reconnecting the units in the predetermined angular relation, and finally releasing the restressed impelling spring.

(3. The method of repeating the impelling movement of an impulse starting mechanism arranged between rotary driving and drive! units, which consists in disconnecting the impulse starting mechanism from the driving unit, turning the driven unit and re stressing the impelling spring of the impulse starting mechanism while maintaining the driving unit at rest, reconnecting the impulse starting mechanism to the driving unit, and finally releasing the restressed impelling spring.

7. The method of repeating the impelling movement of an impulse starting mechanism arranged between rotary driving and driven units, which consistsin disconnecting the impulse starting mechanism from the driving unit, turning the driven unit to bring it to a predetermined angular relation with respect to the driving unit, restressing the impelling spring of the impulse starting mechanism while maintaining the driving unit at rest, reconnecting the impulse starting mechanism to the driving unit, and finally releasing the restressed impelling spring.

8. The method of repeating the impelling movement of an impulse starting mechanism having driving and driven members connected respectively to rotary driving and driven units, which consists in disconnecting the impulse starting mechanism from the driving unit, turning the drivingmember of the impulse starting mechanism against the normal direction of rotation to bring the driven unit to a predetermined angular relation with respect to the driving unit, then turning the driving member of the impulse-starting mechanism in the opposite direction to restress the impelling spr ng while maintaining the units in that angular relation, reconnecting the impulse starting mechanism to the driving unit, and finally releasing the restressed impelling spring. L

9. The method of retiring a cylinder of an internal combustion engine by means of a rotary magneto connected thereto through an impulse starting mechanism, which consists i'n disconnecting the magneto from the engine, returning the magneto to its position for maximum generation'during the subsequent impelling movement while maintaining the engine in its firing position, restressing the impelling spring of the impulse starting mechanism, reconnecting the magneto and engine, and finally releasing the restressed impelling spring.

10. The method of refiring a cylinder Jf an internal combustion en ine by means of a rotary magneto connected thereto through an impulse starting mechanism, which consists in disconnecting the magneto from the engine, returning the magneto to its position for maximum generation during the subsequent i mpelling movement while maintaining the engine in its firing position, restressing the impelling spring of the impulse starting mechanism, reconnecting the magneto to the engine, and finally releasing the restressed impelling spring.

11. The method of refiring a cylinder of an internal combustion engine by means of a rotary magneto connected thereto through an impulse starting mechanism, which consists in. disconnecting the impulse starting mechanism from the engine, returning the magneto to its position for maximum gen eration during the subsequent impelling movement while maintaining the engine in its firing positibn, restressing the impelling spring of the impulse starting mechanism, reconnecting the impulse starting mechanism to the engine, and finally releasing the restressed impelling spring.

12. The method of refiring a cylinder of an internal combustion engine .by means of a' rotary magneto connected thereto through an impulse starting mechanism, which consists in disconnecting the impulse starting mechanism from the engine, turning the magneto to its position for maximum generation during the subsequent impelling movement while maintaining the engine in its firing position, restressing the impelling spring of the impulse starting mechanism, reconnecting the impulse starting mechanism to the engine, and finally releasing the restressed impelling spring.

13. The combination of rotary driving and driven units, impulse starting mechanism arranged between the driving and driven units, and a releasable coupling arranged between the impulse starting mechanism and one of said units; substantially as and for the purpose described.

14. The combination of rotary driving and driven units, impulse starting mecha nism arranged between the driving and' driven units, and a releasable coupling arranged between the driving unit and the impulse starting mechanism; substantially as and for the purpose described.

15. The combination of an internal com bustion engine, a rotary magneto therefor, impulse starting mechanism-arranged between the engine and magneto, and a releasable coupling arranged between the engine and the impulse starting mechanis substantially as and for the purpose escribed.

In testimony whereof I affix my si naturei MAX 'I OST.

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