US3219879A - Ignition system circuit - Google Patents

Description

Nov. 23, 1965 w. CLAUNCH IGNITION SYSTEM CIRCUIT 4 Sheets-Sheet 1 Filed Dec. 8, 1961 F/GZ INVENTOR. MARSHALL W. CLA UNCH ATTORNEY Nov. 23, 1965 M. w. CLAUNCH 3,219,879

IGNITION SYSTEM CIRCUIT Filed Dec. 8, 1961 4 Sheets-Sheet 2 INVENTOR.

M. W.CLAUNCH Y ATTORNEY 4 Sheets-Sheet 3 Aw) H i v Q N nah "3 amp n: h mm Q M. W. CLAUNCH IGNITION SYSTEM CIRCUIT mm mow 12 mm mmw om mow Nov. 23, 1965 Filed Dec. 8, 1961 INVENTOR.

ATTORNEY M. WCLA UNCH v GE Nov. 23, 1965 w. CLAUNCH 3,219,879

IGNITION SYSTEM CIRCUIT Filed Dec. 8. 1961 4 Sheets-Sheet 4 m2 67,. 52 E F IG. 5

M.W.CLAUNCH INV EN TOR.

[8 BY W A TTORNEY United States Patent 3,219,879 IGNITION SYSTEM CIRCUIT Marshall Wilson Claunch, Borger, Tex., assignor to C. Paul Henson, Amarillo, Tex. Filed Dec. 8, 1961, Ser. No. 158,083 6 Claims. (Cl. 315-218) This invention relates to an electrical apparatus and, more particularly, to a magneto for use in an ignition system adapted for multicylinder internal combustion engines and the like.

According to this invention, one magneto may supply any number of points up to the maximum number of distributor cams in that magneto structure at any desired voltage up to the maximum am-Peres output provided by that machine. Additionally, according to this invention, as greater voltages or capacities are required other similar sources of may be connected in parallel therein to provide any desired current or voltage across any desired number of points.

This device and system provides a relatively complete range of modern industrial ignition system supply for an internal combustion engine motor with a minimum of inventory and a minimum of time necessary to adapt a magneto to any of the services desired therefrom. The magneto device also provides a switchover from one system to another; this magneto is designed so that no special tools are required for such changes.

It is one object of this invention to provide a magneto adaptable for use for engines having a varied number of cylinders.

It is a further object of this invention to provide a magneto allowing actuation of the spark plugs for a variety of multicylinder engines with a minimum of inventory.

It is a further object of this invention to provide one magneto machine wihch may be used in a relatively complete range of modern industrial ignition systems.

It is yet another object of this invention to provide a novel ignition system adaptable for four, six, eight, ten, or twelve cylinder engines.

The above and further objects and novel features of the invention will more fully appear from the detailed description provided in the specification hereinbelow, of which specification the drawings attached hereto form a part and wherein same numbers refer to the same parts in all the drawings and wherein:

FIGURE 1 is a diagrammatic phantom view of the major mechanical elements of a magneto of this invention, shown broken away in part, and in perspective;

FIGURE 2 is a diagrammatic showing of the magneto of FIGURE 1 in combination with the engine with which used;

FIGURE 3 is a diagrammatic wiring diagram of a magneto according to this invention for a magnetic ignition system according to this invention for using either six or twelve spark plugs and for using either one or two E.M.F. sources;

FIGURE 4 is a diagrammatic wiring diagram of a magneto according to this invention for magneto ignition of either four, six, eight, ten, or twelve spark plugs using the double source shown in FIGURE 3;

FIGURE 5 shows a magneto according to this invention wherein a single source of and one distributor camshaft provide for actuation of four, six, eight, ten, or twelve spark plugs.

FIGURES 1, 2 and 3 show a preferred embodiment of this invention. All figures show the connections for actuation of six spark plugs (718-768).

A magneto, 10, according to this invention, comprises a distributor section 11 and a magneto section 12, used with an internal combustion engine 13.

3,219,879 Patented Nov. 23, 1965 The magneto comprises a casing 10 with a chamber 10' therein. A distributor camshaft 19 is located therein and provided with a plurality of cams 51-62 thereon. The camshaft serves to actuate a plurality of pairs of contact points 71P-82P for each of said cams 51-62 respectively. Each of a set of contact arms 71A-82A are each pivotally attached to said casing and supports one movable member of each of said pair of points. The movement of each said arm on each said respective cam permits said movable and fixed points to etfect electrical contact across said cam in a controlled sequence and provide the conventional firing order sequence for combustion in the cylinders of engine 13.

A main breaker cam 20 is located in said casing. Its motion is controlled through a gear train, as 23, which also controls the motion of said distributor camshaft. Breaker cam points 28 and 29 are opened by said breaker cam.

A source of electromotive force 17 is actuated by a drive shaft 67 which also actuates said gear train. The E.M.F. source comrpises a magnet 14 connected to and rotated by said drive shaft 67 and a coil 17 with a core having pole shoes 15 and 16 in electromagnetic relationship with said rotating magnet. A condenser 116 is connected from one end of said source of electromotive force across breaker points 28 and 29 to the other side of said breaker cam points, said breaker cam and said source of electromotive force thus being connected in series between wires 26 and 118 and condensers 116 and 117 are connected in parallel thereacross. The supplementary breaker contact points 121 and 122 are connected in series with E.M.F. source 97 across Wires 46 and 118. Condensers 119 and 120 are in parallel between wires 46 and 118. Condensers 116 and 117 provide a sufficient capacitance to substantially completely prevent sparking across said breaker cam points during the normal operational speed of said shaft 67 down to r.p.m. i.e., of its normal operating speedabout 1200 r.p.m.-while providing complete sparking across all of the spark plug points 718-768 in the l-6 position of switch 100 shown in FIG- URES 1 and 3. One point of each of said pairs of distributor contact points 71P-82P is also connected to the common conductor 118 and then through said conductor 118 to a ground 18.

The one end of said source of electromotive force 17 is connected by output conductor wire 26 to one end of the primary coils of each of a plurality of transformers, as 31-36 or 37-42 or 31-42 as below described.

The other end of each of said transformer primaries is connected to the end of the contact arms, as 71A-82A, pivotally fixed to the casing and distant from the corresponding distributor movable contact point located on the opposite side of the distributor cam. In each of said transformers the secondary coils are connected at one of their ends to ground and at the other end across a spark plug, as 718-765 or 778-828 or 718-828, as below described. In the embodiment shown in FIGURE 1 there are 12 distributor cams on the shaft 19 in casing 11. As shown in FIGURE 3, there are 12 distributor cam arms and 12 sets of points in said casing. The rotatable switch means 100 is connected at one end to output wire 26 and at its other end to common conductor 118 through a condenser 116. Switch 100, in position shown in FIG- URE 3, provides for connection of an increased condenser capacity across lines 26 and 118 on removal of connection between the source and transformers 37-42. This increase of the condenser capacity is of a quantity generally inversely proportional to the number of transformers remaining connected across said source of The breaker cam 20 closes the circuit across each of the primary coils of each of the transformers following the closing of the pairs of corresponding distributor cam points. The breaker cam opens and thereby interrupts the current through each of said transformers while each corresponding pair of distributor cam points is closed. The distributor camshaft 19 may be connected to the shaft 21 for the breaker cam by a set of gears: thereby the rotation of the breaker cam is a multiple2X in the preferred embodimentof the speed or the r.p.m. of the distributor camshaft. Where a plurality of sources of are used, as shown in FIGURES 3 and 4, the separate sources of E.M.F., as 17 and 97, each have a separate output line, as 26 and 46, respectively, to each of the transformers actuated by each of said sources of As shown in FIGURE 4, a number of transformers may be cut out by rotatable switch means 130, as controlled by handle 129 and indicator 128, from the circuit and permit that 4, 6, 8, 10, or 12 of the transformers and corresponding spark plugs may be actuated by the plurality of sources of When such change is made, additional capacity 147-149 is connected by switch 130 from the output wire line of each source of to 118 as the number of primary coils of the transformers, as 31 to 42, connected thereacross are decreased. The increase and decrease of capacity is in the range which develops the voltage across each of the points of the spark plugs of each of the transformers so that they all operate in the range from to 200% of the normal operating speed of the distributor camshaft without missing.

The magneto section 12 contains, in the preferred embodiment, a four-pole rotating magnet 14 which rotates in magnetic proximity to a set of laminated pole shoes 15 and 16 of the coil core. The core is provided with a primary coil 17, one end of which coil is grounded at one point 18 through a set of contact points 28 and 29 that are regularly opened and closed. The camshaft 19 and the rotating magnet 14 are driven by a gear train 23, of which one gear 64 is actuated by the crank shaft 30 of the motor 13 wherein the combustion occurs, and which combustion is initiated by the sparks developed by magneto 10. Gear 64 drives shaft 67.

The magneto 10 forms and discharges pulses of low (50-100 v.) voltage along output wire 26 (and 46, as below described) to transformers 31-42 whereat such low voltage is transformed to higher (IO-40,000 v.) voltages needed for ignition of internal combustion engines. Such low voltage transmission lowers corona losses and insulation requirements.

Transformers of similar electrical characteristics, as 31-42, are located adjacent each of the spark plugs for each of the internal combustion engine cylinders, as 31'-36', of the internal combustion engine 13 to provide, from the pulses of low voltage current along output wires 26 and/ or 46, pulses of sufliciently high electrical energy to form sparks across the gaps of the spark plugs adequate to produce ignition in the cylinders of the internal combustion engine 13.

The timing shaft 19 is provided in the distributor section with a series of cams, as 51-62, as shown in FIG- URES 3 and 4 and, as 51-62, as shown in FIGURE 1. Each of these cams is firmly attached to the distributor camshaft: the shaft and cams thus serve to controllably complete electrical circuits through actuation of contact arms 71A-82A, respectively, via pairs of points, as 71P- 82P, respectively and so control the firing order for the spark plugs, as 718-828, via a main breaker cam as below described. The number of distributor cams on the distributor camshaft and their time relationship to each other may be, as below described, changed as needed in view of the number of spark plugs and cylinders to be actuated to permit either four, six, eight, ten, or twelve spark plugs to be actuated by this apparatus.

Main breaker cam 20 may be fixedly located on the distributor camshaft 19, as shown in FIGURE .3, or the main breaker cam 20 may be provided, as shown in FIGURE 1, with a separate camshaft 21 driven by a gear 22. Gear 22 is driven by gear train 49, one gear of which, 48, is mounted on and fixed to shaft 19. Both arrangements may provide the below described desired time relations of the movement of the breaker cam and the distributor cams. In the preferred embodiment, the arrangement is as shown in FIGURE 3 with the main breaker cam and the distributor cams attached to the same shaft. Distributor camshafts with differing cam positions to match the contour of the engine 13, crankshaft 30 and the resulting firing order of the cylinders may be substituted for shaft 19.

In the embodiment shown in FIGURES 1-3 all the distributor cams, as 51-62, are located on the same camshaft 19 and that one camshaft is connected to the rotating magnet 14 by gear train 23. Gear 64 thereof is driven by the motor crank shaft 30; gear 64 drives magnet 14 and gear 65; the latter gear drives gear 66 which is attached to and drives shaft 19.

When the main breaker points are closed, current flows from each primary coil of the source, as 17, through the breaker cam, to the primary in the transformer coils as 31, 36, 37, and 42 in FIGURE 3 and through contact arms 71A, 76A, 77A, and 82A and through the closed contacts 71P, 76P, 77F, and 821 back to the ground 18. The breaker cam 20 is set to close the breaker points 28 and 29 shortly after the corresponding distributor cams 51-62 close their corresponding contact points 71-82P respectively. The main breaker points 28 and 29 are kept closed until the magnetic field reaches its densest condition whereupon the breaker cam 20 opens the breaker points 28 and 29 and so causes a rapid collapse of the magnetic field in the primary coil 17: the rapid collapse of this field generates a pulse of primary current to the primary coils of the transformers as 31-42; the magnetic field thereby developed in each of the corresponding secondary winding of each such transformers produces a high voltage current across the ends of each such secondary winding and fires the respective spark plugs as 71S82S. The distributor cams 51-62 keep the corresponding distributor contacts 71P-82P closed in proper sequence during the collapse of the magnetic field through the core of the corresponding transformer, as points 28 and 29 open prior to the distributor cam opening for each spark plug. 7

Accordingly, the distributor contacts 71P-82P do not open while current is flowing through those contacts; it

' is only after the current ceases to flow therethrough that such distributorcontacts separate.

As shown in FIGURE 3, a plurality of sources 17 and 97 are arranged so that the amperage developed by each or both such sources is distributable across either of the pairs of plug gaps 51-56 or 57-63 or across plugs 51-63. A rotatable gang switch 100 is provided with switch plates 102, 104, 106, 108, and and firmly attached to shaft 112. This switch is shown in FIGURES 1, 2, and 3 in the position for actuating siX spark plugs. This switching arrangement permits actuating transformers 31-36 and their corresponding spark plugs 718-768 by one source, comprising coil 17,

when the switch 100 is in the 1-6 position as shown inv FIGURES 1-3. This switch provides for connecting capacitor 116 as Well as condenser 117 across wires 26 and 118 and grounds out conductor 46 in the event that coil 97 is connected around core 99 in magnetic proximity to rotatable magnet 14.

The position of switch 100 is indicated by an indicator as 101 on top plate 114 and controlled by a positioning means, as knob 113, also firmly attached to shaft 112.

In the position 7-12 of the switch 100 for connection of transformers 37-42 and their corresponding plugs 77S- 82S, condenser 119 is connected across output wire 46 and 118 as well as condenser 120 and wire 26 grounds out.

In the position 1-12 of switch 100, condenser 120 is connected across lines 46 and 118 and condenser 117 is connected across lines 26 and 118. With such condensers so connected, the normal operating speed of 1200 rpm. will permit a coming in speed of 100 r.p.m., and a smooth operating of the breaker points, as 28 and 29 and 121 and 122. However, such condenser 117 (similar to 119) will not serve alone when only points 718-765 or 778-825 are desired to be used with the above apparatus.

Demonstrative experiments evidenced demonstrating the utility of this invention is that a magneto such as described in Overhaul Instructions Bendix Industrial Magnetos Type DLC February 1960, pages 3K625-644, but modified to a wiring circuit as shown in FIGURE 3, such magneto operating with an output of 3 amps. from the primary coil, as 17, at a drive shaft, 67, speed of 400 rpm. and in which the spark gaps (71S-82S) consistently spark with a drive shaft speed of 100 rpm, permits such a magneto with twelve distributor contact points and a condenser 117 of 0.97 mfd. capacity, as shown in FIGURE 3, to operate as a six distributor contact point apparatus, as in FIGURES 3 and 1, when condenser 116 has a 1.2 mfd. capacity without replacement or attention for a period of several weeks.

FIGURE 4 is a combination of components in FIG- URE 3, so many of the components shown in some detail in FIGURE 3 are shown only diagrammatically in FIG- URE 4. FIGURE 4 is a wiring diagram showing how a second source of E.M.F., as 97, comprising a magnet 98 and coil 99, connected as shown, may be combined with a first such source, comprising magnet 14 and source 17 so that any fraction of the output of each or both sources 17 and 97 may be operated according to this invention. In positions A, B, C, D, E, respectively, of handle 129, according to the arrangement shown in FIGURE 4, either four, six, eight, ten or twelve spark plugs may be actuated using two E.M.F. sources. In this combination, as the number of transformers and spark plugs supplied by each E,M,F, source is reduced from the maximum number (six), there is no burning of the points of the spark plugs or the main breaker cams because of the additional capacity put into the circuit as shown. Rotatable switch 130 is formed of plates 131- 146. As shown, it provides for connection of 4-6 of the transformers 31-36 and 4-6 of the transformer 37-42 and to operate any of said sets of transformers and associated points 715-768, 778-828 or 718-828 as desired with the further provision that additional condenser capacity as 147, 148, 149 for use of 4, 8, 6, and points be respectively connected as shown in FIGURE 4 across lines 46 and 118 and across lines 26 and 118 as the numbers of spark plug gaps supplied by each source of E.M.F.as 17 or 97is reduced. The extent of increase of capacity is as above described -i.e., that sufficient additional capacity be added that the breaker gaps used (28 and 29 and/or 121 and 122) not spark and the plugs used all consistently spark at of the normal camshaft speed as well as at the normal camshaft speed.

FIGURE 5 is a wiring of another magneto according to this invention wherein there are twelve distributor cams, as 51-62' and spark plug points, as 71S-82S' and rotatable gang switch handle 162 rotates switch plates 161 of switch 151 so 4, 6, 8, or 10 of such cams and points may be used in switch positions A, B, C, or D respectively, as well as E, for the full number (twelve) of such cams and points. As shown in FIGURE 5, as the number of spark plug gaps actuated by the source is reduced by switch 151, the capacity connected as indicated by condensers 162-166 is increased so that, with substantially the same flux being developed at each r.p.m. of the rotor 14, the voltage across each spark plug is maintained substantially constant.

Twelve distributor cams are used on shaft 19, as shown in FIGURE 5, with appropriate contact arms 71-82' actuating the appropriate points 71P-82P' and the spark plugs 71S-82S.

In FIGURE 5, there is shown only one distributor camshaft 19' which also serves to actuate the breaker cam 20". In another arrangement, such as in FIG. 1, a separate cam and separate drive are used to more rapidly drive the breaker cam lobe than the cam lobes on the distributor camshaft. Thereby the shaft for the breaker cam has a higher r.p.m. than the rpm. of the distributor camshaft. According to this invention, as shown in FIGURE 5, one magneto may be used in a relatively wide range (4-6-8-10-12 spark plugs) of modern industrial ignition systems up to the limit of the output of the source; thereabove, the system of FIGURE 3 or 4 is used.

FIGURE 3 is a diagrammatic showing of the electrical circuit in a magneto with two separate sources of A magneto of this invention, as in FIGURE 5, may also be provided with additional sources, as shown in FIGURES 3 and 4, to provide increments of as needed through such multiplication of the sources of Thus, any multiple of four, six, eight, or ten cylinders can be actuated by the magnetos of this invention with substantially any desired total amperage to the transformers therefor, as 31-42, and thus, provide magneto ignition for a relatively complete range of internal combustion engine requirements. Accordingly, the system and devices of this invention provide not only for utilizing any desired number of distributor points, -N, to actuate a number, N, of spark plugs but also to actuate (a) a number less than N, as in FIGURES 5 and 1, and (b) multiple of N spark plugs, as in FIGURES 3 and 4, or (c) any multiple of a number of such plugs less than N, as shown by FIGURES 3 and 5.

Although only a few embodiments of the invention are illustrated in the drawings and described in detail in the foregoing specification, it is to be expressly understood that the invention is not limited thereto. For example, the basic principles are applicable to systems embodying other known sources of electrical energy, such as battery vibrator or the like, and the invention is not limited in its uses to internal combustion engine systems. Various other changes may also be made, particularly in the design and arrangement of the parts illustrated without departing from the spirit and scope of the invention as the same will now be understood by those skilled in the art.

What is claimed is:

1. An ignition system circuit in which the source of electromotive energy is a magneto comprising (a) a casing with a chamber therein,

(b) a rotatable distributor camshaft in said chamber, a gear and a plurality of distributor cams on said shaft,

( l) a pair of contact points for each of said cams,

one fixed, one movable,

(2) a contact arm supporting the movable point and pivotally attached to said casing and contracting said fixed contact point across said cam for each of said cams,

(c) a rotatable main breaker cam,

(1) a pair of main breaker cam points opened and closed by said breaker cam,

(d) a source of electromotive force connected in series with said breaker cam points, and comprising (1) a magnet connected to and rotated with said gear and a coil in electromagnetic relationship with said rotating magnet,

(e) a condenser connected across said source of electromotive force and across the breaker cam points, one of each pair of said distributor contact points being connected to a ground, a first end of said source of electromotive force distant from said breaker cam points being connected to one end of a primary coil of each of a plurality of transformers predetermined in number and,

(1) each of said transformers secondary coils being connected at one end to a ground and at the other end across a spark plug,

(2) the other end of each of said transformers primary coil 'being connected to the distributor contact point on one of said contact arms distant from said grounded distributor contact point,

(f) electrically conductive means connected at one end to said first end of said source of and at its other end to said ground through a plurality of condensers increasing and decreasing, respectively, the total effective connected capacity of said condensers on removal and addition of connection between said source of E.M.F. and any of said transformers.

2. An apparatus as in claim 1 wherein the quantity of capacity connected across said first end of said source of E.M.F. and ground increases and decreases on removal and addition, respectively, of connection between said source of and said transformers inversely proportional to the number of transformers remaining connected across said source of 3. Apparatus as in claim 1 where the electrically conductive means is a switch means providing that four, six, eight, ten, or twelve of the said transformers and corresponding spark plugs may be actuated by the source of EMF.

4. An ignition system circuit in which the source of electromotive energy is a magneto comprising (a) a casing with a chamber therein (b) a rotatable distributor camshaft in said chamber, a gear and a plurality of distributor cams on said shaft,

(1) a pair of contact points for each of said cams,

one fixed, one movable,

(2) a contact arm supporting the movable point and pivotally attached to said casing and contacting said fixed contact point across said cam for each of said cams,

(c) a pair of main breaker cams on a rotatable shaft, and a pair of main breaker cam points opened and closed by each of said main breaker cams,

(d) a plurality of sources of electromotive force, each connected in series at one end with a pair of said main breaker arm points and actuated by said gear and connected thereto, comprising (1) a plurality of magnets connected to and rotated by a gear train and a pair of coils in electromagnetic relationship with a rotating magnet, said gear train also driving said distributor l shaft,

(e) a condenser connected across each of said sources of electromotive force and across the corresponding breaker cam points in series therewith to the other side of said breaker cairn points, one of each pair of said distributor contact points being connected to a ground, a first end of each said source of electromotive force distant from said breaker cam points in series therewith being connected to one end of a primary coil of each of a plurality of transformers predetermined in number and I (1) each of said transformers secondary coils being connected at one end to a ground and at the other end across a spark plug,

(2) the other end of each of said transformers primary coil being connected to the distributor contact point on one of said contact arms distant from said grounded distributor contact point,

(f) electrically conductive means connected at one end to said first end of said source of E,M.F. and at its other end to said ground through a plurality of condensers increasing and decreasing, respectively, the total effective connected capacity of said condensers on removal and addition of connection between said source of and any of said transformers.

5. An apparatus as in claim 4 wherein the quantity of capacity connected across said first end of said source of and ground increases and decreases on removal and addition, respectively, of connection between said source of and said transformers inversely proportional to the number of transformers remaining connected across said-source of EMF.

6. An apparatus as in claim 5 where the electrically conductive means is a switch between the sources and the ground providing that four, six, eight, ten, or twelve of the transformers and corresponding spark plugs are connected to the sources of References Cited by the Examiner UNITED STATES PATENTS 2,378,893 6/1945 Berkey et al 315--209 2,961,580 11/1960 Harnden 315209 JOHN W. HUCKERT, Primary Examiner.

ARTHUR GAUSS, JAMES D. KALLAM, R. F. POLIS- SACK, Examiners.

Claims (1)

1. AN IGNITION SYSTEM CIRCUIT IN WHICH THE SOURCE OF ELECTROMOTIVE ENERGY IS A MAGNETO COMPRISING (A) A CASING WITH A CHAMBER THEREIN, (B) A ROTATABLE DISTRIBUTOR CAMSHAFT IN SAID CHAMBER, A GEAR AND A PLURALITY OF DISTRIBUTOR CAMS ON SAID SHAFT, (1) A PAIR OF CONTACT POINTS FOR EACH OF SAID CAMS, ONE FIXED, ONE MOVABLE, (2) A CONTACT CAM SUPPORTING THE MOVABLE POINT AND PIVOTALLY ATTACHED TO SAID CASING AND CONTRACTING SAID FIXED CONTACT POINT ACROSS SAID CAM FOR EACH OF SAID CAMS, (C) A ROTATABLE MAIN BREAKER CAM, (1) A PAIR OF MAIN BREAKER CAM POINTS OPENED AND CLOSED BY SAID BREAKER CAM, (D) A SOURCE OF ELECTROMOTIVE FORCE CONNECTED IN SERIES WITH SAID BREAKER CAM POINTS, AND COMPRISING (1) A MAGNET CONNECTED TO AND ROTATED WITH SAID GEAR AND A COIL IN ELECTROMAGNETIC RELATIONSHIP WITH SAID ROTATING MAGNET, (E) A CONDENSER CONNECTED ACROSS SAID SOURCE OF ELECTROMOTIVE FORCE AND ACROSS THE BREAKER CAM POINTS, ONE OF EACH PAIR OF SAID DISTRIBUTOR CONTACT POINTS BEING CONNECTED TO A GROUND, A FIRST END OF SAID SOURCE OF ELECTROMOTIVE FORCE DISTANT FROM SAID BREAKER CAM POINTS BEING CONNECTED TO ONE END OF A PRIMARY COIL OF EACH OF A PLURALITY OF TRANSFORMERS PREDETERMINED IN NUMBER AND, (1) EACH OF SAID TRANSFORMERS'' SECONDARY COILS BEING CONNECTED AT ONE END TO A GROUND AND AT THE OTHER END ACROSS A SPARK PLUG, (2) THE OTHER END OF EACH OF SAID TRANSFORMERS'' PRIMARY COIL BEING CONNECTED TO THE DISTRIBUTOR CONTACT POINT ON ONE OF SAID CONTACT ARMS DISTANT FROM SAID GROUNDED DISTRIBUTOR CONTACT POINT, (F) ELECTRICALLY CONDUCTIVE MEANS CONNECTED AT ONE END TO SAID FIRST END OF SAID SOURCE OF E.M.F. AND AT ITS OTHER END TO SAID GROUND THROUGH A PLURALITY OF CONDENSERS INCREASING AND DECREASING, RESPECTIVELY, THE TOTAL EFFECTIVE CONNECTED CAPACITY OF SAID CONDENSERS ON REMOVAL AND ADDITION OF CONNECTION BETWEEN SAID SOURCE OF E.M.F. AND ANY OF SAID TRANSFORMERS.

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