US1378873A - Oscillating ignition-magneto - Google Patents

Description

A. C. KLECKNE R.

OSCILLATING IGNITION MAGNETO.

APPLICATION FILED ocr.20.1919.

3 SHEETSSHEET 1.

Patented May 24, 1921.

A. C KLECKNER. OSCYLLAHNG IGNITION WAGNETO.

APPLICA'HON FILED OCT; 20, 1919.

1,378,873,; P n M y 24,1921.

3 SHEETS-SHEET 2 A.- C. KLECKNEFL,

Patented May 24, 1921.

3 SHEETS-SHEET 3- srares PATENT OFFICE.

earner, o. KLECKNER, or enema, WISCONSIN, assronon TO WEBSTER ELEGTRIG COMPANY, 0F RAGIHE, "WISCONSIN, A CORPORATION WISCONSIN.

oscmnarmo renrrronavraennro.

Specification of Letters Patent.

Patented May 24, 1921.

Application filed flctober 20, 1919, Serial Z'l'o. 332,092.

To all whom it may come m:

' Be it known that I, ARTHUR C. KLEUKNER,

a citizen of the United. States, residing at Racine, in the county of Racine and State of ll isconsin, have invented a certain new and useful. Improvementin Oscillating lgnition-liiagnetos, of which the following is a full, clear, concise, and exact description, refe ence beinghad to the accompanying wings, forming: a part of this specification,

My invention relates to improvements in ignition magnetos, and is more particularly concerned with the provision of certain 1mprovements applicable to that class of ignition magneto equipments generally known in the trade as oscillators.

Generally speaking, oscillating magneto ignition equipments, as now commonly used, comprise an ignition magneto, the rotor ele ment oi which is normally held in a certain position with res ect to the magneto stator b resilient means, preferably in the nature of a pair of comparatively heavy springs. in the operation of the equipment, the rotor is periodically moved against the tension of these springs to cocked position and released, whereupon the said springs rapidly more the rotor toward the position in which it is normally held by the springs.

l have found that in, oscillating magneto equipments, there is a current created in the generating; winding of the magneto on the cocking stroke, due to the fact that the rotor is being rotated at some definite speed by the mechanism which periodically cocks and trips the same as hereinber'm'e explained, since the circuit including the generatin winding, or primary winding in the case of a high tension machine, is closed during the coming stroke. If, after the rotor is fully cocked, it allowed to remain in this position for a significant period of time, say

for instance a second or two, before it is released, the current generated on the cock-- stroke will die out, so that when the rotor is released and recoiled back to nor mal position, a substantial current for ignition purposes is created in the generatin or primary winding. However, when such an oscillating magneto is used on a high speed engine and is cocked and tripped by a mechanism operating at high speed, so that the rotor has virtually no period of rest before returning on its recoil movement, the current wave created in the generating or primary wlnding during the cocking movement of the rotor does not die out to a zero value, wherefore the current wave created on the recoil movement does not build up from zero value, but to the contrary, commences to build up from a point considerably below -zero value. The result is that when such a magneto is operated at high speed, the current available for ignition purposes is not suliicient, or at any rate, is not of as great a value as it would he were the current created on the cooking movement of the rotor permitted to die out ontirely before the commencement of the recoil of the rotor.

The principal object 01": my present in vent-ion is to provide means for insuring that the current wave created on the recoil or" the rotor shall always be permitted to build up from a zero value, rather than from a point below the zero value, regardless of the speed at which the equipm nt is operated.

In the accompanying drawings I have illustrated my invention applied to a high tension oscillating magneto ignition equipment, wherein the several parts of the equip ment with the details of which my invention is not particularly concerned are shown in what may be considered conventional form. While the magneto illustrated is of the wound armature type, carrying primary and secondary windings, it will be understood that the improvements of my invention are applicable to any suitable form of magneto, whether it be of the wound arma turc type, inductor, or any other type suitable for use in an oscillating magneto equipment.

In the drawings,-

Figure l'is an elevational view of that end of the magneto eqiiipment which carrice the trip finger and rotor Operating springs.

Fig. 2 is a vertical sectional view taken along the rotor axis.

Fig, 3 is a ve'tical sectional View taken on the line 33 of Fig. 2 and looking in the direction indicated by the arrows.

Fig. l is a diagram illustrating the open l to re urn 2.

ation of the interrupter cam and cooperatdevices when the rotor approaches the end of its movement toward cocked position.

Fig. 5 is a similar diagram illustrating the operation of interrupter elements, at, or substantially at the time the peak of the current wave is attained in the primary winding on the recoil of the rotor or armature.

Figs. 6 and 7 are diagrams illustrating a modified arrangement that may be employed with the objects of my invention in view, and

Figs. 8 and 9 are diagrams illustrating a further modification oi the mechanism that n'ia be provided to accomplish the objects of my invention.

Similar characters of reference refer to similar parts throughout the several views.

in the 'i'lrawings, I have illustrated one form. of high tension oscillating magneto equipment provided with the improvements oi my invention. The equipment shown comprises the magnetic traniework 10 and permanent horse-shoe magnets iii-11 pro vided with the usual pole pieces lEZ-12. The

framework 10 shown is provided with a plurality of stud bolts i3-13 whereby the magneto frame may be mounted upon any suitable bracket carried upon the framewmk of the engine with which the ignition equipment is employer i The magneto :fran'icwork as here illustrated is provided with end plates 14: and 15, which serve to ournal he trunnions it and 1? oi the rotor 18, which I have illustrated as being of the wound armature type provided with primary winding 19 and secondary winding 20. Each of said windings have one end thereof grounziled to the arniaxiure core at )[i' i. have shown the magneto as provided with side plates each of which comprises a post 23 provioed with a suitable rol or around which is secured the outer end one of the comparativel, heavy rotor op crating); 22-1 ill. The inner ends of the springs are secured around rollere carried y pins which project hitter-ally rom and pi ferabiy are formed integral with th c: member which is keyed or other we fixed upon the armature trunnion l6. tlonvcniei ly formed integral with the "yoke 26 is a trip linger 27, \i'hici'i it will be understood is periodically en ngr in any suitable and wcli known main" by an engine driven device and n'aoved in a contra cloclm.' 4 direction and 7 released. This movement of the trip lin r and rotor by the engine hanism is of course actension of the trip finger he s11 serve quickly H N/18mm toward normal past support, as for instance, a shelf or tion. While any suita'wle engine driven ap paratus may be used to periodically engage, move and release the trip finger, I prefer to employ the type of operating mechanism shown and described in the co-pending application of John A. E. Carlson, Serial No. QMGJQS, filed December 22nd, 1919. Anyone skilled in the art to which this invention relates will of course understand that when the rotor is cocked, it is moved a substantial distance against the tension of the springs- 242 l,say for instance through an angle of approximately the normal position or" the rotor being such that after being cocked and released it is carried to or past its generating position under the influence of the springs connected therewith.

The insulated lead of the primary Winding is here shown as passing through an insulating bushing 28 extending through the armature trunnion l7, and terminating in an insulated button 29 as shown. Having one end thereof bearing against the button 529 is a brush 30, the other end of which leads to the insulated interrupter element 31 provided with the usual contact 32. The insulated interrupter element 31 may be connected by conductor 33 with one terminal of toe condenser 34: incl'osed by condenser housing 36, the other terminal of the condenser being prounded to the magneto frame in the usua manner. The movable or grounded element of the interrupter is here shown in the form of an arm 37 pivoted at 38 and provided with the contact 39 arranged to cooperate with the stationary interrupter contact 32. The arm 37 is pro vided with cam follower 40 and spring 41., which normally tends to keep the contact 39 in engagement with its cooperating" contact 32. The interrupter elements are conveniently inclosed in a housing 42, which for convenience in illustration has been shown as formed integral with the magneto endplate 15 and provided with a removable cap or closure 43.

Fixed upon the armature trunnion 17 is the cam 44 which is so conformed that when the rotor or armature, during the cocking movement thereof has reached the position shown in Fig. 4, or in other words, is ap proaching the end of its cocking movement, the interrupter contacts are separated to open the circuit including the primary winding. The herein shown conformation oi? thecam 44 likewise insures that when on its recoil n'iovement the armature has rcacljied the position shown in Fig. 5, or in other words, has reached the position where the peak of the current wave of the primary winding is attained, the interrupter contacts are again opened to cause a high tension current to be induced in the secondary winding 20 in the usual manner. During the recoil of t e armature from the point at which navaeva it is released to the point at which the peak of the current wave in the primary winding sulated lead of the secondary winding 20 to the spark plug of the engine with which the apparatus is employed. 1 have shown the insulated lead of the secondary winding extended'to a segmental conductor plate 45, carried by a segmental spool 45 mounted on the armature trunnion 16. Qoperating with the plate 4-5 is a brush as operating in a 1 combined brush holder and terminal 47,

' osition illustrated in this fi ure.

which I have here illustrated as being of the type shown and described in the patent to Walter Brown, #1,3l,182, dated August 26th, 1919-.

The operation. of the mechanism illustrated in 1 to 5 is as follows: a

When the trip finger 537 is engaged by the engine driven actuating mechanism, the armature is cocked in the direction indicated by the arrow in Fig. l until it reaches the During the major portion of the cocking movement of the armature, current is being created in the primary winding 1-9, but prior to the releasal of the trip finger from the en ine driven actuating device, the cam 44 eii ects the separation of the interrupter contacts as shown in Fig. 4, and permits the current created in. the primary winding during the cooking of the armature to die out.

Shortly after the releasal of the trip-fin ger by the engine driven actuating mechanism, and when the armature is recoiled in the direction indicated by the arrow in Fig. 5, under the tension of the armature operating springs, the cam tdllower enters upon the depressed portion of the cam and pen mits the contacts to remain closed until the armature reaches substantially the point at which the peak of the current wave created in the primary winding during the recoil is attained, whereupon the interrupter con tacts are again separated as shown in Fig. 5, with the result that the current created in the primary winding during the recoil of the armature dies rapidly away and induces a high tension current in the secondary winding in the usual manner. It will thus be seen that I have provided means for insuring that the circuit, including the primary winding, shall always be open for at least a significant interval prior to the commencement of the recoil of the armature, so that the current crtated'in the primary winding during; the cocking of the armature may be permittedto die away before the armature starts upon its recoil movement. Thus I am assured that the current wave created in the primary winding during the recoil of the armature may start from a zero value, and not from a point below a zero value, regardless of the speed at which the mechanism may be operated.

Referring now to the diagrams of Figs. 6 and 7, wherein I have shown a modified form of interrupter mechanism, it will be noted that to those parts which correspond in all material respects to corresponding parts of Figs. 1 to 5, I have applied the corresponding reference characters. The interrupter contact 39 of Figs. 6 and 7 is mounted upon an arcuate lever 50 pivoted at 51, the said lever being provided with two cam followers 52 and 53 arranged to co operate with the cam 54., which it will be noted is provided with two points and a comparatively long depressed surface between said points. Acting betweenthe lever 50 and the interrupter housing is a spring 55 which operates to hold the contacts closed fter they have been closed, and to hold the same open after theyliave been separated. In Fig. 6 the cam follower 55: is shown in engagement with the cam and the spring 55 is shown maintaining the interrupter con tacts separated.

Fig. 6 illustrates the positions assumed by the several parts oi the interrupter at the beginning of the cooking movement of the rotor. The rotor is cocked in the direction indicated by the arrow. In this figure, it will be noted that the contacts remain separated during practically all of the cooking movement of the rotor, with the result that the circuit, including the primary windin is open, and no current wave is created in the primary windin At the end of the cooking movement, one of the points of the cam engages the cam follower 52 and effects the closing of the interrupter contacts. The spring 55 new functions to keep the contacts closed. The cam follower 53 is now in en gagement with the and remains in en.- gagement with the cam until, near the end. of the recoil, one oi the points of the cam engages the cam follower 53 and again effects the separation of the contacts.

Fig. 7 illustrates the positions assumed by the several elements of this interrupter mechanism at the beginning of the recoil movement.

It will be noted that the arrangement illus trated in Figs. 6 and 7 differs somewhat from the arrangement shown in the receding figures, in that the circuit including the generating winding, is maintained open duringpractically all of the cooking movement of the rotor, instead of for just a brief interval at the end of the cocking movement, as is the case with the mechanism shown in Figs. 1 to 5 inclusive.

In Figs. 8 and 9 l have illustrated an arrangement wherein two sets of interrupter contacts in series controlled by a single cam llll provided for the our ose of accomplish ing the of my present invention. It will he noted that in this arrangement the stationary contacts indicated at 60 and {31 are ccnnec ed together. 'llhe movable con nch cooperates with the stationary contact 60,8is' mounted on the grounded interrupter arm while the movable cont ct 61 is mounted upon the insulated contact sun Each of the contact arms is provided ith a follower arranged to cooperate i the cam (i l and a spring which normally nds to move the interrupter arm toward the cam, The circuit arrangement been diagi mmatically illustrated. Fig. 8 shows the several parts of the interrupter mechanism in the positions which they as- .me at the beginning of the cocking movement of the rotor, whereas 9 illustrates said parts in the positions assumed by them just prior to the recoil. oi the rotor under the tension of the heavy springs connected.

therewith, Assuming that the rotor" is cocked in contra-cloclnvise directionyasf lit will he noted that shortly after the cocking indicated by the arrow Fig. 8.

movement of the rotor commences, the "follower of interrupter arm 63 rides upon the depressed portion of the .with the re suit that both sets of interrupter contacts remain closed during the major portion of tie cocking movement of the rotor. Y Near the end of the cooking movement one of the points of the cam engages the cam i01 lower of interrupter arm 62 and separates the contacts 60 and 60, with the result that any currcntcreated in the generating wind- 1 dining; the. cocking of the rotor has is to out before the recoil commences. soon the tor recoils in a clockwise itioin, as im d by arrow in 1o c 1 ntacts on and 30 are permitted to each other. with the result that the o1 inchiding the 1 Emmy winding, is closed'until, when at a point near the end oi the recoil movement, the cam follower of interrupter arm 63 is engaged by one of the invests be applied to any satisfactory form of oscil-' lating magneto.

When in the appended claims I refer to an oscillating magneto, I refer to a mag neto of the general class wherein the rotor is cocked against the tension of resilient means and released, whereupon the rotor is recoiled by the resilient means connected therewith rapidly to move the rotor to cause the generation of the current employed for useful work.

Havingthus described my invention, what I claim. as new and desire to secure by Letters Patent is 1. An oscillating ignition equipment 0011- sisting in combination with a magneto comprising a rotor, stator, and primary and secondary windings, spring means normally holding the rotor in a certain position with.

respect to the stator, a trip device connected withthe rotor adaptedto be engaged by an engine driven actuator, moved against the tension of said springmeans and released, to-

rupter mechanism controlling the circuit of the primary winding of the magneto, said interrupter mechanism arranged to insure that the circuit of the primary winding is open for at least a significant period of-time prior to the recoil of the rotor, closed during the recoil of the rotor, and opened near the end of the recoil of the rotor, scria tz'm.

3. In combination with an ignition magneto of the oscillating type, a pair of cooperpolnts oi? the cam to interrupt the primary circuit to cause .a high tension circuit to 0 be induced in the secondary winding in the usual manner.

From foregoing description it will be seen that the instrumentalities for accom sting interrupter contacts controlling the circuit of the generating winding of-the magneto, spring means associated with the interrupter contacts, said spring means tending to maintain the existing closed, or separated, relation to the interrupt-er contacts, and cam plishing tl'e objects of my invention may while I have illustrated my invention as applied to a magneto ofithe wound armature type, it will he understo l at the invention is by no means so line w. but may 55 be varied within. wide limits, wherefore, l mechanism adapted to close the interrupter do not limit myself to the specific construe contacts, in opposition to said spring means, tions herein shown and ,iescril. e l, but deimmediately prior to the recoil of the rotor, sire to claim broadly all equivalent conand adapted to separate the contacts, in 0pstructions embodying; the invention defined position to said spring means, near the end 3- by the appended claims. Furthermore, of the recoil of the rotor.

l. In combination with an ignition magneto of the oscillating type, interrupter mechanism controlling the generating winding of the magneto, said interrupter mechacallo ed,

nism comprising stationary and movable contaets, a pivoted arm carrying the movable contact, spring means connected with said arm at one side of its pivot, said. spring means tending to maintain the existing closed or open relation of the contacts, said arm having two cam followers, one on each side of its pivotal point, and a peripheral cam coecting' with said followers said cam arranged to cooperate with one follower to effect the engagement of the contacts immediately firior to the recoil of the rotor and arranged to cooperate with the other follower to effect the separation of the contacts near the end of the recoil ofthe rotor.

5. In combination with an ignition megneto of the oscillating type, interrupter mechanism comprising cooperating contacts, an arm carrying the movable contact, said arm being pivoted intermediate its ends and provided at each end with a cam follower, a

spring connected with said arm at one side of the pivot thereof, said spring adapted to oppose the separation of the contacts When the latter are in engagement and to oppose the closing of the contacts when they are separated, and a peripheral cam associated with said arm, said can). adapted to cooperate with one follower to effect the separation of the contacts near the end or" he recoil of the rotor and to cooperate with the other follower to close the contacts immediately prior to the next recoil of the rotor, the contacts being separated during the cocking move ment of the rotor.

In witness whereof, I hereunto subscribe my name this 19th day of September, 11) Li).

A. C. KLECKNER.

B. E. NELSON.

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