US1398491A - Ignition apparatus for internal-combustion engines - Google Patents

Description

v. w. KLIESRATH AND F. A. HOYT. IGNITION APPARATUS FOR INTERNAL COMBUSTION ENGINES.

I APPLICATION FILED JULY I5. 192I.

1,398,49 1 Patented Nov. 29, 1921.

3SHEETSSHEET I.

V. W. KLIESRATH AND F. A. HOYT. IGNITION APPARATUS FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY15| I921.

Patented Nov. 29, 1921.

3 SHEETS-SHEET 2.

V. W. KLIESRATH AND F. A. HOYT. IGNITION APPARATUS FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY I5, I92I.

Patented Nov. 29, 1921.

3 SHEETS-SHEET 3.

I M r amvIawto'c/a @QLQQQQL W @3313 MIX;

UNITED STATES PATENT OFFICE.

VICTOR KLIESRATH AND FREDERICK A. HOYT, OF EAST ORANGE, NEW JERSEY, ASSIG-NORS TO THE SIMMS MAGNETO COMPANY, OF, EAST ORANGE, NEW JERSEY,

A CORPORATION OF NEW JERSEY.

IGNITION APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Specification Letters Patent.

Patented Nov. 29, 1921.

Application filed July 15, 1921. Serial No. 484,876.

T 0 all w ham it may concern Be it known that we, VICTOR W. KLIES- BATH and FREDERICK A. Horr, citizens of the United States, residing at East Orange, in the county of Essex and 'State of New Jersey, have invented certain new and useful Improvements in Ignition Apparatus for had to the accompanying drawings which illustrate one embodiment of the same, selected by us for purposes of illustration, and the said invention is fully disclosed in the following description and claims.

In the manufacture of two spark or double spark magnetos, for use with internal combustion engines, each engine cylinder is provided with two spark plugs which are connected with the secondary coil (or coils) and sparks are produced simultaneously at both spark plugs to insure the complete and rapid firing and combustion of the charges of explosive mixture. In the manufacture of magnetos of this type it frequently happens that one of the coils burns out or becomes short-circuited, thereby rendering the o eration of the magneto ineffective and w ere, as is usually the case, these magnetos are employed in connection with automobile engines, the engine is frequently thrown out of operation in a remote neighborhood, necessitating the towing of the car. In double spark magnetos in which both sparks are produced from a single secondary winding upon the armature of the magneto, both ends of the secondary winding being disconnected from the primary winding, and separately connected with two spark plugs located in each cylinder of the ngine through the proper distributing mechanism, it has been found practically impossible to wind a secondary coil upon the armature of the magneto under the limitations of size imposed in ordinary magneto construction with sufficient strength of insulation to stand up satisfactorily under long continued use, and short-circuiting of the secondary winding soon occurs, rendering the magneto inop- -mary coils and a secondary coil for each,

separately connected, each to one of the spark plugs with which each cylinder is provided, and at the same time to provide for the operationof the magneto either as a two spark, or as a single spark magneto in case one of the coils should be rendered inoperative, the construction also providing for the operation of the ignition system from the battery through the magneto coils, or one of them, and the distributing mechanism of the magneto either as a two spark battery ignition system or a single spark battery ignition, so that the continuous operation of the ignition system and the consequent operation of the engine is insured. To this end therefore, the magneto, in addition to the usual primary and secondary coils carried by the armature, is provided with a second primary coil and a second secondary coil associated therewith, which are conveniently mounted upon a stationary portion of the magneto, the primary coils being connected in series and the secondary coils being connected through a double distributing mechanism with the double series of spark plugs with which the engine cylinders are provided, the usual condenser with which the magneto armature is ordinarily provided, in conjunction with the primary winding thereof, serving as the -condenser for both primary coils. In connection with the magneto constructed as above indicated we prefer to provide a switch mechanismor switch mechanisms by means of which either of the primary coils may be short- 7 circuited to convert the magneto into a single spark magneto and whereby one or both of the primary coils may be connected with the battery so as to operate as a two spark or one spark battery ignition system, when desired. This construction of magneto insures that under any and all ordinary conditions, the operator of an automobile engine equipped with such magneto will be assured of beingable to operate the engine'at all times, and will not be likely to be stranded v ith an inoperative engine at some remote: point. r

In the accompanying drawings, which show the preferred form in which we have contemplated embodying our invention, in the construction of a magneto, and also one form of controlling switch for making the various electrical connections to enable the magneto to be operated'in the various ways he'reinbefore indicated,

Figure 1 is a vertical sectional view of a magneto embodying our invention, and capable of being used either as a single or double spark magneto, or in connection with the battery in either a single or a double spark ignition system.

Fig. 2 is a front view of the magneto with the housing for the periodic interrupter removed.

Fig. 3 is a schematic diagram illustrating the relation of the parts of the magneto.

Fig. 4 is a wiring diagram illustrating the magneto and connections from the distributing mechanism to the spark plugs of a double spark ignition system, and showing in connection therewith a battery and one form of switch which we find it convenient toemploy in connecting the magneto for use as a double spark magneto, as a single spark magneto, or with the battery for double spark or single spark ignition, the switch being shown in the off position. 9

Figs. 5, 6, 7, 8, 9 and 10 are detail views showing the switch in different positions, the battery and line wire connections being indicated in exactly the same manner as they "appear in Fig. 4, the other parts of the diagram being omitted to avoid unnecessary duplication.

In the preferred embodiment of our invention herein illustrated, 1 represents the frame of the magneto in which is mounted lever, 8, having a fixed and movable cont-acts 6 and 7 in awell known way. In 'the magneto herein shown, the armature is wound so as to produce two sparks in each revolution of the same, and accordingly two of the cams 10 are provided for this purpose, said cams being mounted on a cam ring 11 which is rotatable on the frame of the magneto by means of a timing lever 12 for the purpose of advancing or retarding the spark in the usual manner. 13 represents the usual condenser, arranged in connection with the primary winding 3 and periodic lnterrupter 5 in the usual manner.

vThe magneto is provided with two tllS cated at 17 and 18 respectively, in the dia- I gram Fig. 4. In conjunction with the distributing rings we preferably employ the usual distributing rotor, indicated at 19, and provided with two distributing brushes 20 and 21, respectively, insulated from each other, this rotor being located above the armature and driven therefrom by means of a pinion 22 on the armature shaft which engages a gear wheel 23 on the rotor, the gears being arranged to drive the rotor 19 at a speed of one to three, or in other words, three revolutions of the armature to one of the rotor. One of the brushes, as the brush 20, is connected with a high tension terminal rod 24, which is concentric with the rotor and is provided at its outer end with a spring actuated brush, 25, hereinafter referred to. The other distributer brush is connected to a metallic plate, 35, engaged by a brush 34, which is connected by a wire or cable 33 with a stationary brush 32, engaging a slip ring 30 on the rotating armature of the magneto, the said slip ring being connected to one end of the secondary coil 4 of the magneto armature, the other end of which is connected to one end of the primary Winding 3 1n the usual manner.

For the purpose of effecting two spark ignition, we employ an auxiliary primary coil and an auxiliary secondary coil connected therewith, the said coils being stationarily mounted on the frame of the magneto, as clearly shown in Fig. 1, in which 7 the magneto frame is shown as provided with a supporting plate 40 above the armature upon which is mounted the primary coil'41 and secondary coil 42, surrounding a soft iron core 43, the core and coils being contained in a suitable case 44 of insulating material, and held in position by a screw 45, extending through the center of the core and engaging a threaded opening in the stationary plate 40. A high tension terminal plate, 46, is provided at one side of the casing 44, in axial alinement with the brush 25, and is connected with one end of the secondary coil 42, the other end being connected to the primary coil 41 as indicated as 47. The high tension terminal 46 and the plate 40 are provided with separated contacts 48 and 49 constituting a safety spark gap for the high tension. circuit. The primary coil is connected by means of a wire 50 with a low tension conductor plateiil secured to but insulated from the supporting plate 40, the said plate 51 being provided preferably with two brushes 52, 53, which bear upon a collecting ring 54 carried by the rotating armature 2 and to which the primarycoil 3 of the armature is connected. We prefer to employ two of these brushes 52 and 53 so that incase of any accident to one of the same, the proper collection of current from the conductor ring 54 will continue through the other brush. The end of the auxiliary primary coil 41 opposite that connected by the lead wire 50 to the brushes 5253, is connected by a wire 55 with a suitable binding post, 56, and the other end of the primary winding is connected by a wire 57 leading from the low tension contact plate 51 to a second binding, post, 58. The binding posts 56 and 58 extend through the easing of the magneto. From the contact 56 a main wire 60 isled and from the auxiliary contact 58 a second line wire, indicated at 61, is led.

Referring now to the schematic diagram illustrated in Fig. 3, it will be apparent that in the ordinary operation of the magneto, if the wire 60 is connected to ground, current will be generated in the primary coil 3 and conveyed throughthe primary coil 41 by means of the slip ring 54 and brushes 5253' and connecting wire 50. When the primary-current is broken by the separation of the periodic interrupter, the high tension current will be induced in the secondary winding 4 of the armature and the secondary winding 42 of the stationary coils, and these high tension or secondary currents will be separately transmitted to the brushes 20 and 21 of the rotor and simultaneously disdistributed to the appropriate spark plugs 17 and 18 for the cylinder which is at that moment in firing position. The magneto will therefore act under these circumstances continuously as a double spark magneto.

The apparatus can also be operated as a -one spark magneto, by cutting out the auxiliary primary coil from the main circuit. This can be done. by disconnecting the wire 60 from the ground connection and making the same connection with the auxiliary wire 61, it being connected to the other end of the auxiliary primary coil 41 eliminates said coil and its secondary coil from the circuit, and the magneto will now operate as a one spark magneto, the high tension current from the secondary armature coil 4 being distributed by the rotor brush 21 to one spark plug in each cylinder.

If the secondary coil 4 should become inoperative by reason of defective insulation, or otherwise, while the'ma-gneto is operating as a two'spark magneto, the current generatcd in the main primary armature coil 3 would nevertheless pass through the auxiliary primary coil 41 and be interrupted by the periodic interrupter, as previously described,'the high tension current from the auxiliary secondary coil 42 being distributed by the rotor brush 20 to one of the spark plugs in each cylinder, so that the magneto will operate to supply the ignition coils for the engine even though the armature secondary coil becomes defective.

It will also be understood that by'connecting a battery in series with the primary coils, as by connecting the wire 60 to the positive pole of the battery and operating the armature in the usual manner, the main and auxiliary primary coils may be energized from the battery to produce two sparksin each cylinder from the main and auxiliary secondary coils. If the battery is connected to the wire 60, and assuming for example, that the secondary winding 4 of the armature has become defective, the battery'current can be sent through the auxiliary primary coil 41 and the main primary coil 3, to the interrupter 5 and the high tension current generated in the auxiliary secondary coil 42 will be distributed by the rotor brush 20 to one of the spark plugs in each cylinder. A battery may also be connected to the wire 61 so as to pass the battery current through the main primary winding 3 of the armature, to the periodic interrupter 5, without passing it through the auxiliary primary coil 41, in which case the apparatus will act as' a one spark ignition apparatus, the high tension current from the main secondary winding 4 being distributed by the rotor brush 21 to one spark plug in each cylinder.

This construction, as will be readily understood, therefore, provides a wide range of operative effect and by making the necessary circuit connections, the device can be operated as a one or two spark magneto, as desired, or as a one or two spark battery ignition apparatus, as desired, and upon the failure of one or other of the secondary coils, the magneto current or the battery current can be employed to energize the other secondary winding and produce a spark at one spark plug in each cylinder, all these effects being produced without any change in the magneto itself by simply varying the electrical connections exterior to the magneto and insuring the continuous operation of the engine.

Referring to Fig. 4 we have shown one form of switch mechanism which may be conveniently combined with the magneto for the purpose of making the connections before described, or any of them, but it will be understood that we do not limit ourselves to this specific form of switch, as these connections may be made by means of other forms of switch or switches, if desired, and this particular switch apparatus is illustrated more particularly in order to more clearly set forth the operation and advantages of our improved magnetos. As illustrated in Fig. 4, the switch comprises a circular series'of contacts and a rotatable or oscillating switch member cooperating therewith. In the form herein shown, the

72, 73, 74,, 75 and 76, arranged in a circle. The contact 7 O is connected with the wire" 61 and a branch wire 61 connects the wire 61 with the contact 72. The contact 71 is con-.

', nected by wire 71 with the ungrounded contact of the periodic interrupter in circuit with, the primary, coil 3 of the armature. .The contact 73 is connected to ground 1n any desired manner. The contacts'74 and 76 are both connected to the main wire 60, and the 'contact 75 is connected to the battery which is in turn connected with ground. It is to be understood generally that the ground connections herein referred to are for purposes of completing the return, circuit and are customarily made through the frame work ofthe engine or magneto, but obviously may be made by return wire or wires if desired 80 represents a rotatable or oscillating switch member pivotally mounted concentrically with the circular series of 1 switch contacts just described. The switch member 80 carries at one end a segment 81 in electrical contact therewith, and a segment 82 insulated therefrom, as by insulating material 183. The opposite end of the switch member 80 carries a short segment '84 in electrical contact with the switch member 80 and segment 81.

In Figs. 5 to 10 inclusive we have shown different positions of the switch which may now be briefly described. In Fig. 5 the switch member is shown in the 0H, position, the segment 81 being in engagement with the contact 70 but the segment 84 being located between contacts 73 and 74 so that no circuit is completed through the magnet and the ignition system is inoperative when the switch is in this position.

In Fig. 6 the switch-member 80 is shown in position to make contact through the segments 81 and 84 and the switch member 80 with the contacts 70 and 7 3, thereby connecting the wire 61 with the ground and short circuiting the auxiliary primary coil 40, as will be readily seen by reference to Fig. 4. In this position of the switch the magneto will operate as a one spark magneto and high tension current will be distributed from the main secondary winding 4 to one spark plug in each cylinder.

Fig, 7 shows the switch rotated to its third position, in which the,segment 81 is brought into engagement with the contact 76 while the segment 84 is still in engagement with the contact 7 3'. This connects the wire 60 with ground and establishes the main circuit through the primary coils 3 and 41. In this positlon of the switch the magneto will operate as a two spark magneto and high tension current from both of the secondary coils 4 and '42 will be distributed to produce two sparksin each cylinder simultaneously. switch comprises stationary contacts 70, 71,

Fig. 8 shows a fourth position of the switch, in 'which the segment 81 has been moved into engagement with the battery contact 7 5 while it is still in engagement -wit the contact 76, leading to the wire 60. In thisposition of the switch the battery current flows to the contact 75, thence over the switch segment 81 to the contact 76, thence breaker or periodic interrupter 5, and thence to ground. This arrangement enables the device to operate as a one spark battery ignition system, even though the armature coil or coils are inoperative by reason of being burnt out or grounded.

Fig. 9 shows a fifth position of the switch, in which the segment 81 is in engagement with the battery contact 75 and the segment 84 is in engagement with the contact 72. In this position of the switch the battery current flows t0 the contact 75, thence across the switch member 80 to contact 72, thence by wire 61 to the wire 61, thence by wire 50, brushes 52and 53 and collectingring 54 to the primary coil 3 of the armature, and thence to the periodic interru ter 5, and ground. This-arrangement ena les the apparatus to function as a one spark ignition system, the auxiliary primary coil 41 being out of the circuit, and the high tension current being distributed from the main secondary coil 4 and rotor brush 21 so that the device can be operated in this manner without utilizing either of the auxiliary coils.

Fig. 10 represents a sixth position of the switch in which the switch member 80 has been moved so'as' to bring the segment 81 into engagement with the battery contact 75 and the contact 74, which are thereby connected with the .wire 60. The battery current will now flow from the battery to contact 75 across the segment 81 to contact 7 4, thence by wire 60 to the auxiliary primary coil 41, thence by wire 50, contact brushes 52-53 and collecting ring 54 to the main primary coils from the battery current and effecting the distribution of the high tension currents from the secondary coils 4 and 42, independa ently to the rotor brushes 20 and 21, and producing two sparks in each cylinder simultaneously. In this position of the switch, the apparatus operates as a two spark battery ignition system.

[he great and varied advantages of this invention will be readily apparent. In addition to enabling the operator to connect the apparatus in any of the various ways previously described for insuring the' 'op eration of the engine, it is also to be noted that the auxiliary coils 41 'and 42 may be removed from the magneto for repair or re winding, and the apparatus may still be operated as a one spark magneto ignition or a battery one spark ignition system, as desired, according to the position of the switch.

What we claim and desire to secure by Letters Patent is 1. The combination with an internal com-. bustion engine, provided with two spark plugs in each cylinder thereof, a magneto having amain primary winding, a mainsecondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of

a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and

a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independentl close the circuit from said secondary wind ings to both spark plugs in one cylinder at each period of ignition.

2. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary'winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and asecond distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being'insulated from each other and rotating in unison to simultaneously and independently close the circuit from said secondary windings to both spark plugs in one cylinder at each period of ignition, and means for rendering the auxiliary primary coil inoperative, to enable the apparatus to operate as a one spark magneto ignition apparatus.

3. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, 2. main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independently close the circuit from said secondary Windings to both spark plugs in one cylinder at each periodof ignition, a battery, means for placing the battery in circuit with the auxiliary primary winding, and means for placing the auxiliary primary winding in circuit with the periodic interrupter independently of the main primary winding, and for rendering the main primary winding inoperative to enable the apparatus to operate as a one spark battery ignition apparatus.

4. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in se ries with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distribueach period of ignition, a. battery, means for placing the battery in circuit with the auxiliary primary winding, means for placing the auxiliaryprimary winding in circuit with the periodic interrupter independently Of the main primary Winding, and for rendering the main primary winding inoperative, and means for independently render ng the auxiliary primary winding lnoperative, whereby the device may be operated as a two spark magneto ignition system, a one spark battery ignition system, or a one spark magneto ignition system.

5. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independently close the circuits from said secondary windings to both spark plugs in one cylinder at each period of ignition, a battery, and means for connecting the battery in circuit with the primary coils and periodic interrupter.

6. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independently close the circuits from said secondary windings to both spark plugs in one cylinder at each period of ignition, a battery, means for connecting said battery in the main circuit with said primary coils, and means for placing the auxiliary primary coil in circuit with the periodic interrupter, independently of the main primary winding, and for rendering the main primary winding inoperative, whereby the device may be operated as a two spark magneto ignition system, a two spark battery ignition system, or as a one spark battery or magneto ignition system.

7. The combination with an internal combustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independently close the circuits from said secondary windings to both spark plugs in one cylinder at each period of ignition, a battery, means for connecting said battery in the main circuit with said primary coils, and means for rendering the main primary coil inoperative, whereby the device may be operated as a two spark magneto ignition system, a two spark battery ignition system, or a one spark battery ignition system.

8. The combination with an internal coinbustion engine, provided with two spark plugs in each cylinder thereof, a magneto having a main primary winding, a main secondary winding electrically connected thereto, a periodic interrupter in circuit with said main primary winding, and a distributer connected to the main secondary winding and to one of the plugs in each cylinder, of a stationary magnet comprising a core, an auxiliary primary winding connected in series with the main primary winding, and an auxiliary secondary winding connected with the auxiliary primary winding, and a second distributer connected with the auxiliary secondary winding and with the other spark plugs in said cylinders, said distributers each comprising stationary contacts, and a rotary contact, said rotary contacts being insulated from each other and rotating in unison to simultaneously and independently close the circuits from said secondary windings to both spark plugs in one cylinder at each period of ignition, a battery, means for connecting said battery in the main circuit with said primary coils, and means for independently rendering inoperative the main primary coil and the auxiliary primary coil.

9. The combination in a magneto, of a rotary armature, provided with a main primary winding and a main secondary Winding, connected at one end to the primar winding, a periodic interrupter provide with a rotary part operated in timed relation with the armature shaft, and provided with separable contacts, one of. which is grounded and the other of which is con-. nected to one end of the main primary winding, a slip ring on the armature connected to the other end of the main primary winding, a stationary magnet mounted on the frame. of the magneto, and comprising a core, an auxiliary primary winding, and an auxiliary secondary winding having one end connected with the auxiliary primary winding, a brush connected with one end of said auxiliary primary winding, and engaging said slip ring to connect the primary coils in series, and distributing mechanism comprising two independent circular series of contacts and a rotor provided with two contacts, insulated from each other, and each connected with one of windings.

10. The combination in a magneto, of a rotary armature, provided with a main primary winding and a main secondary winding, connected at one end to the primary winding, a periodic interrupter provided with a rotary part operated in timed relation with the armature shaft, and provided with separable contacts,'one of which is groirndedand the other of which is connected to one end of the main primary winding, a slip ring on the armature connected to the other end of the main primary winding, a stationary magnet mounted on the frame of the magneto, and comprising a core, an auxiliary primary winding, and an auxiliary secondary winding having one end connected with the auxiliary primary winding, a brush connected with one end of said auxiliary primary winding, and engaging.

said slip ring to connect the primary coils in series, and distributing mechanism comprising two independent circular series of contacts and a rotor provided with two contacts, insulated from each other, a slip ring on the armature connected to the mam secondary winding, a brush engaging said slip ring, a high tension connection from said' brush to one of said rotor contacts, a high tension connection connected to. the other rotor contact and extending axially of the rotor, a brush connected with said axial high tension connection, and a contact plate on the magnet connected to the auxiliary secondary coil and engaging said last men tioned brush.

11. The combination in a magneto, of a rotary armature, provided with a main primary winding and a main secondary winding, connected at one end to the primary winding, a periodic interru ter provided with a rotarypart operated in timed relation with the a matu e shaft,'and provided said secondary auxiliary secondary winding having one end connected with the auxiliary primary winding, a brush connected with one end of said auxiliary primary winding, and engaging said slip ring to connect the primary coils in series, and distributing mechanism comprising two independent circular series of contacts and a rotor provided with two contacts, insulated from each other, and each connected to one of said secondary windings, and an electrical connection to said brush independent of said auxiliary primary winding for short-circuiting the latter,

12.. The combination in a magneto, of a rotary armature, provided with a main primary winding and a main secondary wlnding, connected at one end to the primary winding, a periodic interrupter provided with a rotary part operated in timed relation with the armature shaft, and provided with separable contacts, one of which is grounded and the other of which is connected to one end of the main primary winding, a slip ring on the armature connected to the other end of the main primary winding, a stationary magnet mounted on the frame of the magneto, and comprising a core, an auxiliary primary winding, and

an auxiliary secondary winding, a brush connected with one end of said auxiliary ring to connect the primary coils in series, and distributing mechanism comprising two independent circular series of-contacts and a rotor provided with two contacts, insulated from each other, and each connected to one ofsaid secondary windings, and an electrical connection extending to the ungrounded contact of the periodic interru'plter for short-circuiting the main primary e01 13. The combination in a. magneto, of a rotary armature, provided with a .main primary winding and a main secondary winding, connected at one end .to the primary winding, a periodic interrupter provided with a rotary part operated in timedrelation with the armature shaft, and provided with separable contacts, one of which is grounded and the other of which is connected to one end of the main primary winding, a slip ring on the armature connected to the other end of the main primary wind ing, a stationary magnet mounted ion the frame of the magneto, and comprising a core, an auxiliary primary winding, and an auxiliary secondary winding, having one endconnected with the auxiliary primary winding, a' brush connected with one end of said auxiliary primary winding, and en gaging said slip ring to connect the primary coils in series, and distributing mechanism' comprising two independent circular series of contacts and a rotor provided with two contacts, insulated from each other, and each connected to one of said secondary windings, an electrical 'cTmnection to said 1 brush, independent of said auxiliary rimary winding and an independent electrical connection extending to the ungrounded contact of the periodic interru ter. 4

In testnnony whereof we a x our s'lgna- 15

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