US974824A - Spark-plug. - Google Patents

Description

E. C. RAUGH,

SPARK PLUG.

APPLICATION FILED AUG. 25, 1909.

Patents@ Nov. s, www

atto/anew ELMER c.r RAUCH, or 00EUR DALENE, IDAHO.

SPARK-PLUG.

Specification of Letters Patent.

Patented Nov. 8, '1910.

Application filed August 25, 1909. Serial No. 514,622.

To all whom it may concer-n: i

Be it known that l, Enum: C. RAUCH, a citizen of the United States, residing at Coeur dAlene, in thc county of Kootenai and State ofldahmhave invented a new and useful Spark-Plug, ot which the following is a specification. n'

This invention has reference to improvements in spark plugs for producing a spark by the vpassa-ge of an electric current between separated terminals located within an explosion chamber to cause the ignition of an explosive charge therein. l p

-The object of the presentinvention 1s to include in a spark plugthe' means for cans ing the generation of a current producing Aa spark between the circuit terminals lodged within the explosion chamber.

It is customary in the make and break type ofA spark plugs to complete an electric circuit by bringing the electrodes within the explosion chamber in electrical Contact and then by thesudden' separation of the terminals to rupture the circuit so thatthe selfinduction of the circuit due to the presence of a self-induction coil included in the circuit shall cause the Generation of a high potential current of snfticientquantity to-bridgelthe spark gap caused by the separation of: the circuit terminals within the explosion chamber in the form of a fat, -hot spark which will ignite the explosive charge in the usual manner. l

ln accordance with the present invention there is a magnet forming a part of the spark plug and arranged to bring cli-cuit tcrlninals in the explosion chamber together and then the circuit exterior to the spark plug is ruptured causing the denergization of the magnet and the separation of the spark plug terminals, thus` producing the spark. l

The invention will be best understood from a consideration of the following detail description taken yin connection with the accompanying drawings orn'iing a part of thisspecification .in which drawing there is shown a central longitudinal section of a spark plug embodying the invention, the showing being on anenlarged scale, and there also bei-ng shown a diagranmiatic rcpresentation of the electric circuit.

Referring to the drawings, there is indij cated at 1 a ortion of the Walls of an explosion cham er through which Wall there 4tive terminal is indicated. `at 5.

is passedY the threaded,enti?52W the body 'portion 3 of a spark plug. This body p0rtion has a central longitudinal passage 4 and the end of the threaded portion 2 eX- tending intothe explosion chamber consti- 'tutes one of the active terminalsof the spark plugas will hereinafter appear.

Theouter'end of the body 2 is enlarged and lprovided with screw threads y-it'or the reception ofa cap nut 6 having ene end reduced in diameter as indicated at? and provided with a central perforation. Thereis provided a coil S in the form vvof a solenoid wound upon an insulating spool 9, Within which is a core 10 of magnetic material throiwh which 'is a central passage 11 enlarge(4 at o ne end as shown at 12 and provided at the enlarged end with internal screw threads as indicated at 13. The core 10 extends at one end beyond the corresponding end of the coil. 8 and there is provided with a circumferential flange 14 of greaterV in place.

Extending through the central passage 11 This acof the core 10 from the end thereof comcident with the passage 4 through the ,body 3v of the spark plug to the enlarged portion 12 of the said passage through the core 10, is a ro'd 16 tormcdfat'the. end cntcrmg the extension 12 ofthe passage 11 into a head 17.

This rod extends entirely through thcpassage 4t and beyond thev terminal or electrode 5 an'd there is bent at an angle as shown at 18 to form ai'iotherelectrode or terminal capable of moving into contact with the terminal 5. The end of the passage 4 remotefrom the terminal 5 is enlarged circuinferentially as indicated at 19 and this nd is closed by the corresponding end of iecore 4t. Fast on the rod 16 in operative armature block 2Q, the purpose of which will presently appear. Applied to the threaded outer end of the core 10 is a screw plugQl between which and the head `17 there elation to the corresponding end of the core' i O'ffand lodged iii' the enlargement 19 is an i is lodged a spring 22 housed within the portion 12 of the internal bore of the core 10. The plug 21 extendsbeyond the outer end ot the core and there receives a thumb nut 22E designed to cla mp a comluctor to the core l0.

At some convenient point there is loi-ated a battery-24L or other source otl electric current and on one side this battery is connected by a conductor 25 to the walls of the explosion chamber 1 in the particular showing of the drawings and on the other side the batteryl is connected by a conductor 26 to a circuitv controller-27 or' the make and breakl type, the other side of .which is connected by areonduetor 2S to the coil 8 by means of a binding post The other side of the coil 8r is` directly connected to the core 10, while the core l0 is connectedv by a conductor 30 to thewallso the explosion chamber 1.

"Sinee'spa-rk' plugs are customarily employed in connection with explosion engines it maybe assumedy that the circuit controllingfdevice 27 is driven by a rotatinglpart of the'engine in proper timed relation. Every time the circuit controller 27 causes a closure of the `circuit there is established a circuit which may be traced as follows: Proceeding fromthe battery-24, the current will' pass by wa" of the conductor 26 to thecircuit co'ntro ler 27` thence by conductor-28 to the -coil 8:'and from the latter to the core lO'and.

then returning t'o the batter through the conductor 30, Wallsof the eXp osi'on chamber 1 andconductor 25. This will cause the energization of the coil 8 andthe magnetizaa? spark between the said terminals, and

causing. the tiring of a charge Witlnnthe eX-4 plosion chamber in the usualI manner.

Vhile the spark plug has been described as provided with ar single coil 8, this does not/preclude the use ofa double coil'. for the sam'elpurpose, but, formanufacturing reasons-the single coil; is preferable since theA 'lril'igpin \\'orks through the center ot' it anditis easier to protect and cheaper to Amamitactureand has been found'etlieient in praetice.- The-rod or pin 1G is madeotsuitable non-magnetic material'whlle the armature?4 20 will ofcourse be made ofv magnetic` material.y rlhe screw- 2l provides a means not j only for closing the outer end of the spark' plug` against escape ot the gases of combustion, but alsoprovides a means tor adjusting the tension of the spring-'22.

4 sat/asf lVl'iat is claimed is y 1. A spark plug of the make and break type, comprising a body portion adapted to enter an ignition chamber and there constituting one terminal ot' the plug, said body portion having a longitudinal passage therethrough enlarged at the end remote from the ignition chamber, and an eleetromagnet mounted on the body portion of the plug, a core for the magnet provided, with a longitudinal passage enlarged at the outer end and there Screw threaded, a tiring pin eX- tending through the body portion of the plug into the hollow core and there formed Iwith an enlarged end housed in the enlarged portion of the passage through the core, said tiring pin carrying within the enlarged portion of the passage through the body of the plug an armature in operative relation to the core and at the end remote froml the end within the core'extending beyond ther ignition chamber end of the body por-tion of the plug and there bent at an angle to constitute a terminal of the plug in operative relation to the terminal at the ignition chamber end of the body portion of the plug, a closure for the enlarged end of the core provided With Screw threads adapted to the threaded end of the passage through the coreI and a spring housed in the core and compressed between Athe-closure and the-enlarged. end` of the firing pin, said spring tendingV to maintain the tiring pin in open circuit position.

2. A spark plug comprising a body portion provided with an axial passage enlarged at one end, a magnet mounted on the body portion, a core for the magnet projeeting beyond one end' thereof and there provided. with a. circumferential tlange, a cap-nut on the end of the body portion of Athe plug and interposed between the same and the adjacent endo'f the magnet, said cap nutinclosing saidlange, insulating material between the body portion'of the plug and the flange on the core and also between the said flange andthe cap nuta rod extending through the passage in the body ofthe plugand into and movably along the core and formed at one end intoa ycircuit terminal in operative relation tothe explosion chamber endof the bodyportion ol. the plug, and an armature carried by the rod within the enlarged portion of the passage through the body of the plug in operative relation to the corresponding end ofthe core.

' In testimony that I claim the foregoing as my'own, I have hereto affixed my signature'in the presencey of two witnesses.

ELMER (l. ltAUUll.

fitnessesz T. V. CAsn, A. L. Ration.

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