US1172698A

US1172698A - Ignition apparatus for combustion-engines.

Info

Publication number: US1172698A
Application number: US81033014A
Authority: US
Inventors: Valere A Fynn; Burns Dick
Original assignee: WAGNER ELECTRIC Manufacturing CO
Current assignee: WAGNER ELECTRIC Manufacturing CO
Priority date: 1914-01-05
Filing date: 1914-01-05
Publication date: 1916-02-22
Anticipated expiration: 1933-02-22

Description

V. A; FYNN & B. DICK. I I IGNITION APPARATUS FOR COMBUSTION ENGINES. APPLICATION F LED-m5. 1914.

1,172,698. Patented Feb. 22,1916.

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A A AAAXAAA A A v. A. FYNN & B. DICK. I

IGNITION APPARATUS FOR COMBUSTION ENGINE S. AP PLIC ATION FILED 1AN.5,1914.

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* MIMI as 40 APPLICATION FILED JAN. 5, I914.

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I WITNESSES} %Q @VE/VTORS v Z @W M Pa oented Feb. 22, 19 16.

V. A. FYNN & B. DICK. IGNITION APPARATUS FOR COMBUSTION ENGINES. APPLICATION FILED IAN. 5, 19:4.

1,172,698. v PatentedvFeb..22,1916.'

5 SHEETS-SHEET 4.

1 WITNESSES. al/VI/EIVTORS QWfiI -LZ V. A. FYNN & B. DICK.

IGNITION APPARATUS FOR COMBUSTION ENGINES.

APPLICATION ryuzu JAN-5, I914.

1,172,698. Patented Feb. 22; 1916.

5 SHEETSSHEET 5.

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UNITED STATES PATEN vA'Lnnn A. FYNN AND B RNS men, or en LOUIS, MIssoUnI, ASSIGNORS To WAGNER ELECTRIC MANUFACTURING COMPANY, on ST. LOUIS, MISSOURI, A CORPORATION or MISSOURI.-

Specification of Letters Patent.

LP'atented Feb. 22, Tera.

Application filed January 5, 1914. Serial No. 810,330.

T all whom it may concern:

Be it known that we, VALiiRn A. FYNN and BURNS DICK, subjects of the King of England, residing at the city of St. Louis,

Missouri, United States of- America, have invented a certain new and useful Ignition change from one to the other automatically,

and to so arrange the connections of the system that there will either be no waste of current or only a very small waste regard less of the position in which the engine stops.

Another object is to make it possible to operate with a normally closed single spark circuit, interrupting it only when the single spark is to be produced. .7

Other objects and advantages will appear from the detailed description.

In carrying out our invention,-we preferv to so arrange the circuits that vibrator sparks will be produced at low engine speeds and a single-spark at higher engine speeds, the change to the single spark and back to vibrator sparks taking place auto matically. To this end, and in one formof our Invention, we provide a timer, two serially connected breaks in the primary ignition circuit, control the one mechanically and the other electromagnetically, arrange for the first to be normally closed, the second to be normally open, and provide means for holding the second in its closed position above a certain engine speed.

Our invention will be better understood by reference to the accompanying drawings in 'which Figure 1 illustrates one form of our invention as applied to a vehicle operated by an" explosion engine and carrying a storage battery and a dynamo electric machine adapted to charge the latter. Fig. 2 shows modified means for holding the vibrator contacts closed. Fig. 3 is a modification of Fig. 1 and shows automatic means for operating switch 44 of Fig. 2. Fig. 4t is a modification of Fig. 3, and Fig. 5 is another modification of Fig. 3.

Referring more particularly to Fig. 1, 6

1s a storage battery such as used'on motor cars and adapted to cooperate with a directcurrent generator, connection between the two being made under certain conditions by an automatic switch of usual construction. The generator has an armature 34,

brushes

35, 36 cooperating therewith, a shunt winding 37 connected to said brushes. The gen-, erator should also be provided with suitable means for regulating its output (not shown in'the figure). The automatic switch has an armature 3O pivoted at 32, provided with a contact cooperating with a stationary con-- tact 29 but normally held away from the latter by a spring 31. A coil 33 connected to the

brushes

35, 36 of the generator, oppose the action of the spring 31 and tends to bring the armature 30 into contact with the terminal 29, thus connecting the. dynamo to the storage battery.

The ignition system comprises an induc tion or spark coil having a primary 2, and a secondary 3 connected to one or more spark plugs in the usual manner, only one of these being indicated at 4, 5. The system also comprises an electromagnetic relay having a core 13, a high resistance many-turn winding 1% and a low resistance winding of few turns, also a spring mounted armature 17 adapted to cooperate with the stationary contact 16, but normally held away from the latter by the spring 19. A revolving timer, mechanically connected to the shaft of the explosion engine in the usual manner and adapted to close the circuit of the winding 1i during a prolonged interval of each revolution, is electrically connected across the contacts controlled by the relay. This timer consists of a revolving drum 24 of insulating material, carrying a'conducting plate or segment 26 permanently connected to the-armature 17 of the relay and adapted to be connected to the stationary contact 16 through the relay coil 14: by means of a stationary brush 27 cooperating with thesegment 26. This timer also cooperates mechanically with the contact breaker which has an arm pivoted at 21 andv provided with a contact adapted to cooperate with a stationary contact 22. Thearm of this contact breaker is normally held in its closed position by 110 means of the spring 23, but is forced to break contact at the point 22 once during every revolution of the timer, by an insulated projection. or cam 25 located on the latter. The cam 25, the stationary contact 27, and the conducting plate 26 of the timer are preferably placed in such relative positions that with a clockwise revolutionof the timer drum, contact between the plate 26 and.

'the brush 27 will be made at about the time when contact isrestablished between 20 and 22. Any other time, relation between the closing of the contact breaker and the closing of the circuit of coil 14 may, however, be chosen. The later the circuit of coil 14 is closed, the greater will be the advance of the single spark over the first vibrator spark, when the vibrator apparatus is rendered inoperative as hereinafter described. Fig. 1 also shows a dry cell battery 8, which may be substituted for the storage battery 6 by properly manipulating the switches 7 and 9. The push button 12 is provided for enabling the operator to make the attempt to start the on no on compression. The vibrator or relay can be made inoperative by properly manipulating the switches 7 or 9. The condenser 28 is connected across the two breaks in the primary ignition circuit at 16 and 22, for the purpose of reducing the damage done by sparking at these contacts.

In normal operation, switch 7 stands on point ll, switches 9 and 12 are open, and, assuming that the dynamo electric machine is either at rest or not generating a sufiiciently high E. M. F. to operate the automatic switch cooperating with the contact 29, the different circuits may be traced as follows: Starting at the terminal 40 of the storage battery 6, the low resistance primary ignition circuit can be traced through the primary 2, the stationary contact 22, the contact breaker arm 20, to the armature 17 of the relay. This circuit is interrupted at this point for the position of the timer shown in Fig. 1, but when the relay is energized, the armature 17 contacts with the terminal 16 and the primary ignition circuit can be traced back to the storage battery 6 by way of the switch 7 and the terminal 39. The coil 14 of the relay is connected in shunt across the stationary contact 16 and the armature 17, the circuit through said coil being controlled by the coiiperation of the brush 27 with the contact plate 26 of the timer 2%. The push button 12in turn shunts the contact plate 26 and the brush 27, making it possible to close the circuit through coil 14 independently of the timer. The condenser 28 .is connected on one side to the stationary contact and on the other to"the stationary contact 22; The secondary ignition circuit comprises the high tension. coil 3 and. a spark gap 4, 5. lhe dry cell battery 8 may be substituted for the storagebattery 6 by opening switch 7 and placing switch 9 on point 10. The relay may be eliminated from the primary ignition circuit when operating from the dry cell battery 8 by placing switch 9 on point 11. l The same object may be achieved when operating from the storage battery 6 by placing switch 7 on point 38.

The mode of operation is "somewhat as follows: Assuming that the internal combustion engine is at rest and that the dy namo electric machine is mechanically connected thereto,-then the latter will also be at rest and the automatic switch will be open. In order to start the engine, it will be necessary for the operator to place switch 7 on point 41, or switch 9 on point 10, thus relying either on the storage battery or on the dry cells for producing ignition. Assuming that the switch 7 is placed on point 41, as shown in, Fig. 1, and that the engine has stopped in such a position as to leave the timer, which is mechanically connected to the engine shaft in the usual manner, in the position indicated in Fig. 1, then the primary ignition circuit is entirely open, being interrupted at the stationary contact '16; the highly inductive shunt to that break formed bV the coil 14, being also interrupted because the brush 27 is not in contact with the conducting plate 26. The operator may now make the attempt to start the engine on compression by depressing the push button 12. This will close a circuit through the primary 2 by way of the relay coil 14, thus energizing the core 13, attracting the armature 17 and closing the true primary circuit at the point 16. But an electrical conne tion between the armature l7 and the stationary contact 16 short-circuits the coil 14 causing the core 13 to lose its magnetization and to release the armature 17, thus interrupting the primary ignition circuit and producing a spark in the secondary ignition circuit. This play Will continue as long as the push button 12 is kept depressed and the sparks thus produced in the cylinder or cylinders, may start the engine.

20 and. the contact 22, and, on rotation being continued, will close said contact, and, at or about the same time, will also close the circuit of coil 14 by bringing the conducting plate 26 of the timer into contact with the brush 27, thus reestablishing the conditions which obtained when the ,push. button 12 was depressed, and causing the armature 17 to vibrate as long as-27 remains in contact with 26, this vibration of thefarmature .17 producing sparks in the, secondary ignition circuit in the manner a1- I generates a voltage approximately equal to that of the storage battery, then the automatic switch will close under the action of,

the solenoid 33, and, 'if the dynamo voltage is a little higher than that of the batterv, a current will flow to the latter through the winding 15 of the relay. This Winding may be so proportioned that even a small charging current flowing from the dynamo to the battery will be sufficient to hold the armature 17 permanently in contact with the terminal 16, thus eliminating the vibration of the relay and the consequent interrup ions of the primary ignition circuit due to t. \at cause. This circuit will, however, continue to be interrupted at the point 22 by the interaction of the cam 25 and the lever 20, this interruption producing a single spark, preferably occurring in advance of the first spark produced by the relay or vibrator when not-held closed by the coil In this manner, we automatically change from a vibrating spark at low speeds to a single spark at speeds exceeding that at. which the value of the voltage generated by the dynamo electric machine equals or slightly exceeds the average value 2 of the storage battery voltage. The operation is much the same when switch 7 is open and switch 9 stands on point 10, except that the storage battery is then replaced by the dry cell battery. It may be desirable,

for instance, in case the relay or some of its windings are damaged, to eliminate the latter from the primary ignition circuit without entirely crippling the plant. This can be done by placing switch 9 on pointll, or switch 7 on point 38, when a singlespark will be produced every time the cam 25 interrupts the circuit between the lever 20 and the contact Fig. 2 differs from Fig. lin that coil 15 is not included in the circuit between the storage battery or the dry cell battery and the dynamo electric machine, but is shunted. by means of the switch 44, either across the battery terminals or across the terminals of the dynamo electric machine. Supposing the switch 44 to be standing on point 42, then we so proportion coil 15 that it will hold the relay contact closed as soon asthe dynamo has reached a predetermined voltage. Should the dynamo become damaged or get out of order, then the switch 44 may be thrown over to point 43 at any,

desired time during the operation of the combustion engine, this action immediately causing single sparks to be produced at the contact and suppressing the series of sparks produced at 16, thus changing from a vibrator to a single spark ignition.

In Fig. 3, the switch 44 is operated by a centrifugal device 46 actuated by the. rotation of the explosion engine and arranged to connect the coil 15 in parallel to the storage battery after a predetermined speed has been reached; the closing of switch 44 being arranged to take place at that speed at which vibrator or plural sparks are advan tageously replaced by a single spark. Fig. 3 further differs from Fig. 1 in that the conducting segme'nt 26 is connected to contact 22 instead of to the lever 20. By this change, it is possible to cause the first plural spark. to occur immediately after cam 25 has dropped 20 into contact with 22,

thereby reducing the advance of the single over the first plural spark. To this end the timer elements must be so located relatively to each other that contact between 26 and 27 is made soon after it is broken at 22 and soon enough to give the current in .14 time to rise and close the relay contacts before 20 again contacts with 22. Under these conditions, 14 will hold the relay, closed until the cam drops the lever 20, when 14 will be short-circuited and will release the armature 17, thus producing the first of the plural sparks.

Fig. 4 differs from Fig. 3 in that the contact breaker arm 20 is held away'from con- Y tact 22 for a longer periodand that the projection 18' of said arm coiiperating with the cams 2b is also made use of to make connection between the arm 20 and the conducting plate 26, in addition to the contact made with this plate by the brush '27. The contact piece 18 on the arm 20, thecams 25 on the timer 24, the conducting plate 26 on said timer, and the brush 27 cooperating with the latter, are placed in such relative even greater extent than is the case in Fig. 3. As long as the coil 15 of the relay is not energized, nothing will happen when the cams 25 break contact between the lever 20 and the t-sllllntll 22, but as soon as lever 20 is connected to the brush 27, byway of the contact plate26, the armature 17 of the re- By this lay will begin to vibrate and produce a more or less extended series of sparks, this play continuing until the connection between 20 and 27 is broken. When the coil 15 of the relay is energized and the primary circuit is closed at 16, then a single spark will be produced every time one of the came breaks the connection between the lever 20 and the terminal 22, but no sparks will be produced when contact is made between 20 and 27 by way of 26, be-

cause this circuit is shorted by the armature 17 being in contact with the terminal 16. In Fig. 4, the timer is provided with two cams, thus producing two single sparks for each revolution, or two series of plural sparks per revolution. Fig. 4 also differs from Fig. 3 in that the shunt winding 37 of the charging dynamo is connected between the main brush of the latter and an auxiliarybrush 47, thus illustrating one means of regulating the output of the charging dynamo.

In Fig. 5 is shown anotherway of reducing the necessary advance of the single spark over the first vibrator spark. The vibrator coil 14 is connected directly across the contact 16 and the armature 17 ofthe' vibrator, while an, additional coil 49 is wound on the vibrator core and connected between the vibrator armature 17 and the contact breaker arm 20. The coil 49 has approximately the same number of turns as the coil 14 but its resistance is much lower.

This coil 49, contact breaker arm 20, and the stationary contact 22 with which the latter cooperates, are shunted by the timer, the

brush 27 thereof being connected to the armature 17 of the vibrator and the conducting segment 26 tothe stationary contact 22. The push button12 is connected to the brush 27 on one side and to the stationary contact 22 on the other. It is preferred to connect

coils

49 and 15 that they magnetize in the same direction. All other parts of the ignition system shown in Fig. 5 are the same as those illustrated in Fig. 3. In Fig. 5, the exciting winding 37 of the dynamo electric machine is connected between the main brush 35 and an auxiliary brush 47, for the purpose of limiting the output of this machine, and the core of the automatic switch adapted to connect the dynamo electric machine to the storage battery when the former has reached a sufiicientlyhigh voltage, is not only provided with the shunt coil 33 butalso with the series coil 48 connected to assist the shunt coil 33 when the dynamo sends current into the storage battery. This arrangement causes the automatic switch to open, positively as soonas the voltage of the dynamo falls below that of the battery and the latter is sending current into the former.

The operation of the modified ignition system illustrated in Fig. 5 is somewhat" begins torevolve, propelling the timer; in a clockwise direction, the vibrator contactswill remain separated and the contact breaker closed until the cam 25 "engages the contact breakerarm 20. During this interval, the circuit through the primary 2 of the spark coil is completed through the breaker arm 20, the auxiliary coil 49 and the vibrator coil 14; but the magnetization produced by the latter is equal and opposed to that produced by coil 49 and the armature. 17 is, therefore, not attracted by the core 13. As the cam 25 lifts the arm 20 and interrupts the primary circuit at the point '22, the current through 14 and 49 is interrupted and the armature 17 still remains at rest. It is not until 27 comes into contact with 26 that vibrator sparks are produced, for then there is a direct connection between the primary 2, the coil 14 and the armature 17.

This direct connection renders coil 49 inef-' fective whether the contact arm 20 is raised by cam 25 or not, and the vibrator then op breaker arm 20 out of engagement with the terminal 22, thus interrupting the primary ignition circuit. This circuit will be reestablished either when 20 again contacts with 22 or when 27 contacts with 26. Which of these two contacts is made first depends on the relative setting of the cam 25, the brush 27 and the conductive segment 26. As a rule, it is preferable to so set these elements that contact between 27 and 26 will be established very soon after the cam 25 has interrupted the circuit at 22. As an instance, the timer may be allowed to travel through about five degrees, after the interruption has taken .place at 22 and before circuit is established between 27 and 26. It will be convenient to reestablish a connection between 20 and 22 long before the connection between 26 and 27 has been broken.

l/Vhen the engine is stopped after having been operated from the storage battery 6 or the dry cells 8. then switches 7 or 9 should be opened. by the operator. If he forgets to do so and the engine stops in sucha position as to leave 27 in contact with 26, and 20 in contact with 22, then the relay will continue to vibrate and a small current will magnetic means for holding said first mentioned means in the position assumed when making llllB CllCHlt.

2 In an ignition system, a primary circuit, a secondarycircuit, electro-magneti cally controlled means for making and breaking the primary circuit, and a mechanically controlled device for interrupting the primary circuit, said mechanically controlled interrupter being arranged to interrupt the primary circuit in advance of the initial movement of the electro-magnetically controlled interrupter.

3. In an ignition system for internal combustion engines, the combination of a primary circuit, a secondary circuit, mechani cally controlled means for opening and closing'the primary circuit, electromagnetically controlled and normally open means for closing and opening the primary circuit, and means for holding the electro-magnetically controlled means in its closed position.

In an ignition system for internal combustion engines, the .-combination of a primary circuit, a secondary circuit, mechanically controlled and normally closed means for opening the primary circuit, electro magnetically controlled and normally open means for closing and opening the primary circuit, and means for holding the electromagnetically controlled means in its closed position.

5. In an ignition system for internal combustion engines, the' combination of a primary circuit, a secondary circuit, mechanically controlled and normally closed means for opening the primary circuit, electromagnetically controlled means for closing and opening the primary circuit, and means forpreventing interruption of the primary circuit by the electro-magnetically controlled means.

6. In an ignition system for combustion engines, a secondary circuit, a primary circuit, electromagnetically controlled means for making and breaking the primary circuit, and means dependent'on the speed of the engine for holding the first mentioned means in the position assumed when making the circuit.

7. In an ignition system for combustion engines, a secondary circuit, a primary cirfor opening and closing the primary circuit,

and means governed by the speed of the engine for holding the first mentioned means in closed position at higher engine speeds and releasing the same at lower engine speeds.

9. In an ignition system for internal combustion engines, the combination of a primary circuit, a secondary circuit, mechanically controlled and normally closed means for opening the primary circuit, electromagnctically controlled and normally open means for closing and opening the primary circuit, and means dependent on the speed of the engine for-holding the electrom-ag netically controlled means in the closed position.

10. In an ignition system for combustion engines, a secondary circuit, a primary circuit, a battery in said primary circuit, elecnetically controlled circuit breaker in its closed position.

11. In an ignition system for internal combustion engines, the combination of a battery, a primary circuit, a secondary cir-- cuit, mechanically controlled and normally closed means for opening the primary circuit, electromagnetically controlled and normally open means for closing and opening the primary circuit, and means governed by the speed of the engine for connecting the battery to hold the electromagnetically controlled means in its closed position.

12. In an ignition system, a primary circuit, a secondary circuit, a movable member for makingand breaking the primary circuit, an electromagnet for attracting the movable member to close the primary circuit, the exciting coil of said magnet being in shunt circuit With a portion of the primary circuit containing the movable memher, and means for holding said movable member in its closed position.

13. In an ignition system, a primary circuit, a secondary circuit, a movable member for makin and breaking the primary 'cir cuit, an e ectromagnet for attracting the movable member to close the primary cirpositioned to close sai ber in its closed position, and a mechanically operated movable contact in theprimary circuit.

14. In an. ignition system, a primary circuit, a secondary circuit, a movable member for making and breaking the primary circuit, an electromagnet for attracting the -movable member to close the primary circuit, the exciting coil of said magnet being in shunt circuit with a portion of the primary circuit containing the movable member, means for holding said movable member in its closed position, and means for opening and closing the circuit through the exciting coil of the magnet.

15. Inan ignition system, a primary circuit, .a secondary circuit, a movable member for making and breaking the primary circuit, an. electromagnet for attracting the movable member to close the primary cirand tWo movable contacts, one of said contacts being actuated from the engine, an electromagnet for actuating the other contact, and an additional engine controlled contact for opening and closing the exciting circuit of the magnet.

17. In an. ignit on system for combustion engines, an energizing circuit comprising the primary winding of an induction coil and two movable contacts, one of said con-- tacts being actuated from the engine, an electromagnet'for actuating the other contact, means controlledby the engine for opening and closing the exciting circuit of the magnet, said last n med means being I exciting circuit shortly after the engine controlled contact of the energizing circuit has been actuated.

18. In an ignition system for combustion engines, an energizing circuit comprising the primary Winding of an induction coil.

and two movable contacts, an electromagnet for actuating one of said contacts, a rotatable member driven by the engine and adapted to actuate the other contact, and an additional contact carried by the rotatable member and adapted to close the exciting circuit of the electromagnet.

19. An ignition system for internal combustion engines comprising primary and secondary circuits, means for producing vibrator sparks, means for producing single sparks, and means dependent on the speed of the engine for rendering inoperative the means for producing the vibrator sparks.

20. An ignition system for combustion engines comprising a charge igniting circuit, and means dependent on the speed of the engine for producing single sparks in the igniting circuit at higher engine speeds and vibrator sparks in said circuit at lower engine speeds.

21. An ignition system for combustion engines, an energizing circuit comprising a source of electrical energy, a charge igniting circuit in inductive relation to the venergiz ing circuit, and means dependent on the speed oi the engine for utilizing the source of energy to produce single sparks in the igniting circuit at higher engine speeds and vibrator sparks in said circuit at lower engine speeds.

22. In an ignition system for combustion engines, an energizing circuit comprising the primary winding of an induction coil and two movable contacts, one of said con tacts being actuated from the engine, .an electromagnet for actuating the other con tact, means controlled by the engine for opening and closing the exciting circuit of the magnet, said last mentioned means being positioned to close said excitingcircuit shortly after the engine controlled contact of the energizing circuit has been actuated, and means for continuously holding the electromagnetically actuated contact in its closed position.

23. In an ignition system for combustion engines, an induction coil, a dynamo electric machine driven by the engine, a battery, a primary ignition circuit connected both to the terminals of the battery'and to the terminals of the dynamo electric machine and comprising a Winding of the induction coil and two movable contacts, engine controlled means for operating one of said contacts, an

, electrdihagnet for .operating the other con.-

tact, said electromagnet being connected in shunt W1th a portion of the energizing circuit including said last named contact, and

means for permanently holding said last mentioned contact in its closed position.

24. In'an lgnltion system. for combustion engines," an induction coil, an electromagnet, an "armature operated by the magnet, a

circuit-breakeroperated the engine, an

energizing circuit comprising a primary winding of the mduction coil and two movable contacts, one operated by the electromagnet and the other by the circuit breaker. means tending to hold the magnet operated contact in its open position, and means for continuously holding said contact in its closei position at relatively high engine spee 25. In an ignition. system, a primary circuit, a secondary circuit, means forinaking and breaking the primary circuit, two' coils -netize in opposite directions, one of said coils being connected in series in the pri-' mary circuit and the other connected inshunt with a portion of said circuit including the said electromagnetically controlled breaker in the primary circuit and means for shuntlng the portion of the prlmary -circuit including the first mentioned coil and the mechanically operated circuit breaker.

27. In an ignition system, a primary circuit, a secondary circuit, means. for making,

and breaking the primary circuit, two coils in operative relation with said'means and wound to magnetize in opposite directions, one of said coils being in the primary-circuit and the other connected in shunt with a portion of said primary circuit including the interrupting means, and means for continuously holding the interrupting means in its closed position.

28. In an ignition system, a primary cir cuit, a secondary'circuit, means for making and breaking the primary circuit, two coils in operative relation with said means and wound to magnetize in opposite directions, one of said coils being in the primary circuitwand the other connected in shunt with a portion of said primary circuit including the interrupting means, means for rendering the first mentioned'coil inoperative, and means for continuously holding the interrupting means in its closed position.

- 29. In an ignition system for combustion engines, a secondary circuit, a primary circuit comprising two movable contacts, a timer device operated by the engine and controlling one of said contacts, electromagnetic means for controlling the other contact, said means comprising a coil in shunt with a portion of the primary circuit containing said contact and a series .coil in the primary circuit, said coils being wound to magnetize in opposite directions, and means controlled by the timer for establishing a circuit in shunt with the portion of the primary circuit including'the series coil and' the timer controlled contact.

mechanically operated circuit 30. In an ignition system for combustion engines, a secondary circuit, a primarycircu1t comprising two movable contacts, a timer device operated by the engine and-controlling one of said contacts, electromagnetic means for controlling the other contact, said means comprising a coil in shunt with the portion of the primary circuit containing said contact and a series coil in the primary circuit, said coils being wound to magnetize in opposite directions, and means controlled by the timer for establishing a circuit in shunt with the portion of the primary circuit including the series coil and the timer controlled contact, said last named means being arranged to operate immediately after theopening of the timer controlled contact.

31.' In ignition apparatus for combustion engines, a secondary circuit, a primary circuit comprising two movable contacts, electromagnetic means for controlling one contact, said means comprising an' exciting coil in shunt with the portion of the primary circuit containing said contact, a rotatable timer device operated by the engine and provided with means for actuating the other movable contactand with a conducting segment, and a brush, and connections cooperating with said segment to close the circuit through the exciting coil.

32. In ignition apparatus for combustion engines, a secondary circuit, a primary circuit comprising a movable contact, a rotatable timer device operated by the engine and provided with a cam for actuating said movable contact and with a conducting segment, a brush and connections cooperating with said segment to shunt the portion of the primary circuit containing the movable contact. e

33. In ignition apparatus for combustion engines, a secondary circuit, a primary circuit comprising a movable contact, a rotatable timer device operated by the engine and .provided with a cam for actuating said VALERE A. FYNN. [L.s.] I BURNS DICK. [L.s.]

Witnesses:

R. H. I-IERMINGHAUs, C. B. BENNETT.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, I). C.