US935931A

US935931A - High-tension spark-plug.

Info

Publication number: US935931A
Application number: US46664808A
Authority: US
Inventors: John Sharp; William Sharp
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-12-09
Filing date: 1908-12-09
Publication date: 1909-10-05
Anticipated expiration: 1926-10-05

Description

J. & W. SHARP.

MGH TENSION SPARK PLUG.

Arrmoulon FILED DBo.9,19os.

Patented Oct. 5, 1909.

.Iori-ir' SHARP Aivii WILLIAM sir-IAR?, cs cLEvELAN'D, omo.

vSpecification o f Letterlatent.

HIGH-TENSION SPARK-PLUG.

Application-tiled December 9,- 1908. Serial No.' 466,648.

To-all whom it may concerm" Be it known that we, JOHN 'SHARP and WILLIAM SHARP,l citizens of the United Sta-tes,v and residents -of Cleveland,- in the. Ycounty of Cuyahoga and State of Ohio, have invented `vcertain new and 'useful Improve. ments. in- High-Tension ySpark-Plugs, of which we hereby declare the following to be a enable others skilled in the artto which it appertains to make and use-the same.

Tliefobjects of the invention are to provide an improved form of sparking plug,

eiiciene'y will be' obtained spark underall conditions of oul gas and: carbon producing vapors when exploded in the expansion chamber of-'the engine.

The sparking fplu hereinafter described is adapted to be sel low to provide for admission of rarefied gas behind -the sparkingter'minals, to -enrich the spark and' to prevent it from blowing out and also to provide chambers which will contain abody of vgas whichvwhen ignited by the spark willv shoot out, into `the body of gasin the cylinder, and insure its immediate explosion.

A further object obtained by theiiiternal chambers is found lin the opportunity thus afforded for 'heating the insulation of the inner terminal and its st m, and thus evaporating the moisture w ich often accumulates therein, especially when the'insulation is composed of laminated sheets, compressed together.

Further objectsof the invention are to provide protected terminals, which can not be bent or forced out of adjustment by rough usage and at the same time are capable of easy adjustment.

A further advantage is found in a' hollow 'stein for the insulated central terminal, by means of which and the. concentric form of the outer or ground terminal gasolene or other priming iuid can be directly injectedA into the body .of the sparking plug and if necessary into the combustion chamber of the engine, thus simplifying the matter of starting the pist-on in a cold engine.

`A further advantage found in the opportunity afforded for heating the spark plug, is'

the fatter spark obtained, since the arc will be stronger when passing through a heated medium.. For this reason' also' less battery Cleansing, and is hol power will berequired to create a spark of predetermined volume.

.- The invent-ion further comprises the forms of 'construction l and combination 'and ar'- range'mentof parts and provides vfor the various requirements hereinafter: described,

shown in Athe accompanying drawings, and

'specifically pointed out in the claims. full, clear, and eXactdescription, 'such as will In the accompanying drawings, Figure 1 is Van elevation of the improvedfsparking plug; Fig. 2 is a-central longitudinal'section 4therethrough;'Fig. 3 is an elevation ofthe insulated or central-terminal and its stein; for -use in the explosion end of4 a gasolene i or other explosion engine, whereby increased i reducing a Fig. 4 isa similar view of the saine showe;` jing-a modified form of terminal heador ti provided with spiral' openings; nFig. 5 is afp'laiil view of the tip shown in Fig. 3 ;Fig. 6

lisl a plan view ofthe -tip shown'in Fig. 4; Fig.

7 is a longitudinalsection of an expansion chamber at the outer end of the insulated stem of theinner terminal adording an iiicreased s'upplyofraretied gas, and Figs. 8,

-9 and 10- are'modiieid forms of the exterior or ground terminal adapted to be attached to' the body ofthe plug. Fig-11` is a vertical lsection' of theV outer end of the stem showing a. valve therefor.

It may be prefaced that Asince this plug is adapted for use with .analternating and high tension current, theterminals are called positive or negative or ground merely for convenience in description.

'In these figures A is the metal body of lthe plug, screw threaded at B for` attachment to the explosion end of the engine cylinder.

This body is hollow and provided with a shoulder C against which theenlargement D formed in the cylindrical'insulation E of the central metal stein F rests. p acking nut G threaded' for` adjustment in the threaded upper endf of the bodyA, clamps 'the parts securely together. The lower-portionl of the insulation E is tapered at H, and the walls of the hollow body A. are spaced therefrom so as to form -a' chamber within the body. A metallic conical head or tip J terminates the inner end of the stein F and this is shown to be provided with slits K, K, which communicate with a central opening or chamber L in the tip, and the stein v`F is also hollow at M, therefore providing for an elongated chamber extending throughout the stein, and preferably closed by a removable screw plug N or valve N at its upper extremity. The stein F and tip .l are preferably Psr'ewedl'together at 'O'in sucha man-. circular andv preferably conntersiink'atfsfo ner .as to provide. aclamping shoulder P asA `to Yprovide anouter rimoredgegtoward .against which theinsulaton rests,.which is which oil'will run and thus prevent "it from sleeved over 4the" stem. The upper' endv of interfering with the free'action of the'spark the stem is .shown to be externally screw between'the terminals. .These terminals may 7othreaded to receive the metallic clamping be made in several orms as shown, in'Fig's. 8, 'i 'sleeves and nuts Q, R, and' S. The ip J. is 9 and '10"when" slitted across the central tapeedltoward lower end and -ha's a opening as shown at'Fig. 8. A further ad terminal 'orifice `T through which projectsvantage is obtained in thatthe spark .will

the terminal wire U which tits tightly there.A "travel or revolve Afrom one of the segmental "75 inbutcan,beforced outward orinward by tips" to another and thus save, the terminal hand or by means of a tool inserted-in the from disintegration.` hollow 'stem M. It must be held securely by. In Fig. 10 a. small nipple w', is shown friction so that in use no sudden jar. will screwed into the semi-globulartip.'v In 1 5 atfect it, but-be capable of manual ad` 9 the semi-globular tip is screwed upon the 80j justment. tapered extremit Small changes as'thes'e In'tlie form of tip shown in Fig, .3 the Sides are included wituln the 'spirit of .the inof the'tip, :will have sulicient springacton to VI110I-1 *hold itfiniplacefflhe inner extremit of the fllavlng described the mventionwwhatwe Zo'metallic body 's .hollow'and spaced om the claim as newand desire to securelby-:Letters 85 metallicfinnertipto form a chamber Vand Patent 1S1 Y l. the body rninates in a hemispherical out-er' V l; In .COmblnationnin a spark plug',l a-Tholf terminal ,Wwhich is provided with a cenlOW Inet-al bOdy v] O )I'1 0I'1,l Sclfw'thl'dedir;

tralv orifice X, through which the inner inSeItlOIl into an englne cyl1nder,.a-apered terminal' wir@ yU projects, and standsflush mner extremity therefor, .provided -wt l1 a z9d 4,with the outer terminal. The outer terminal chamber, and aSemi-globular termina1therevXis, providedlwithjine longitudinal slits Y, fOr pIOJeGtilg beyond said taperedextrem-v .,-llwvhich-serveto.admit gas in a wiredrawn 1ty,'the sald termmal provided with affcencoriditil .to .fthe-chamber V, where it ex-V tralcountersunkorifice andwith ine'longipands and-.becpmes more rareied and hence tudmal shts, communicating .saids more explosive than the gas in the engine lchambe r,'an d an inneriterminal s aidce'nf .cylindenu'A second rarefa'ction takes place tral or1fce,`-acentral s temconnectediw'ith as thegasesv pass through the ne slits K, K said inner terminal, land an ins `1 1l2 ition'tl1`ere `.v 1. ntothechamber formed within the hollow or,said.stem1and nsulationsecuredwithn. stem. The gases included within the cham said hollowbody'p* il -bers V and M explodeinstantaneously when 2. Ina Spark plug, in conrbinatiomaaholf the spark occurs, and are driven tlaming .low metal body, a projecting conicalrextrem-f violentlylinto the expansion chamber of the ity for said body containing'f'a gas chamber,' engine, thus vpreventing any possibility of .and a rounded terminal therefor, Vsaid termi- 40: the failurefof an explosion in the cylinder.; Anal provided with a central oricefand 'withfzlQ-B# The slits/'communicate with the central narrow longitudinal slits, communicating orii'ce, hence forming openings large enough with said chamber', a hollow stem-therein-, a f topass thaflama The inner portion Z of metal tip therefor containing anfinner'cliamthe body'. of the plug is externally tapered ber, and alsol having narrow slitsin-its walls, nd'l'fmlmfled by the smooth rounded end` land spaced 'from vthe walls of 'saidbodyyansll of the terminal. "Thistapered portion of insulation upon said stem and means forse-'lA the 'body isadapted to extend into the `excurlng the' same within the hol-low1 metal plosionhamber of the engine, so as to be body, aclosure forthe outer extremityjof completely sweptby the iame of the exthe stem, and afterminal wlre secured`adi1- plosion, and hence cleaned thereby 4of ,soot justably in sad metal tip. *.115 or, other. foreign'v matter, the shape be- 3. A hollowstem for a spark plug ailinging such` as to facilitate the cleansing theresulation4 thereon, a -hollow-innerhead or tip of. Anexpansion Ma of the hollow central therefor, provided with narrow slits vin' its' stem permitso'f still greater rarefaction of walls, a terminal wire, secured-in said tip; the gas vin theinner chamberand increasesand projecting therefrom, a`rnetal 'bodyflfol 120 itsA volume when employed. Further importhe plug, aj projection therefrom, -a -cij tant advantages in theaccumulation of gas cular terminal therefor adapted tOi-:encirgin'the'in `eigzeliambei-Varefound'inthe beneclesaid wire; saidterminalprovided'fwithrat centfral' orificeandfiwithqlogitainalznamw tjsgthe said metal'rt-ipfbeiiigfspaced..from .f1-25 "saidi body' totorin ,allseliaiiberf corrinnir iic'at ing with theopenings-inf-said tip .and'feircu' tral orifice and with marginal narrow slits,

and with a chamber communicating therewith,a terminal Wire located in said central orifice, a hollow stem in which said Wire is adjustably supported, and an insulation for said central stein.

A5. In a chambered spark plug, in combination, a metal cha-mbered body, and a central chambered stem therein, an insulation for said central stem, a terminal Wire slidingly mounted in said chambered stem, a circular outer ,terminal for said metal body having a central orifice and slits in its Walls communr eating with the chamber in the metal body, the chambers in said stem and body being in communication with each other.

G. The combination with a chambered metal body of a circular terminal therefor, provided With a central oriic'eand'with narrow longitudinal slits in itswalls, the said oriiice and slits communicating with said chamber and With each other the edges of said central orifice being externally counter- .sunk substantially as described.

"4'. In combination in a spark plug, a chambered bodyand a chambered inner stem therefor, an insulation separating-said body and stein, a tip for said chambered stem provided With narrow openings communicating lwith the chamber in the body, a terminal for the body provided .With a Vcentral opening and with narrow slits communicating with in said central oriice.

In testinionyvwhereof, We hereunto set our hands this'th day of December 1908.

' JOHN SHARP.

VILLAM SHARP In presence of* WM. M. Momma, GEO. S. COLE.

eoV

the chamber in-said body, and a terminal for