US1471249A - Spark plug - Google Patents
Spark plug Download PDFInfo
- Publication number
- US1471249A US1471249A US397231A US39723120A US1471249A US 1471249 A US1471249 A US 1471249A US 397231 A US397231 A US 397231A US 39723120 A US39723120 A US 39723120A US 1471249 A US1471249 A US 1471249A
- Authority
- US
- United States
- Prior art keywords
- coating
- spark
- spark plug
- spot
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
Definitions
- I g My invention relates to sparkrplugssnch.
- the object of my inyention' is to insulate '7 as completely as possible, the surface ofthe central electrodeor other metallic parts of a spark plug, so that no currentor ignition spark can pass except between two'small unprotected spots.
- one of said electrodes being coated vi th aw cozrtingof metalliof'phosphate, thesaidl coat-1 d ng-being removed fro other electrode.
- a sparkplugheving'two electrodes one of said e1e-ctrodes ha-ving a coating of metallicr'phosphate overlaid with a coating of uranium oxide; a portion of said double coating being removed at" a spot opposite the other elec'trode.-.-
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- Spark Plugs (AREA)
Description
H. EARLE SPARK PLUG Filed July 19. 1920 7 I Patentetlflt v of i Ui it tesaresidingatWa V the tllln' -co.ndu ti g i g is riTo -all it-hem t ma QM M 5 H mymemjorwammmassaenesmmsg1: i
Application ma Jiu ie,
Be itknown thatI, HEN YLEA LnQa citi'-;
"'rernin the county of Worcester and State of Massachusetts;have invented certainnew V r c and. useful Improyementsan; Spark Plugs,
' of which'the following "ls'a'fspeoification,
I g My invention relates to sparkrplugssnch.
as are used ingas engines for ignition of the exglosiye mixture.
'These spark phig 'freqnently becoine coy;
V V ered with 7 carbon and the accumulation of carbon between the two electrodes frequent- 'ly results gin short T cireiiits which I greatly reclucethe efliciency ofthesparkplug; V H The object of my inyention' is to insulate '7 as completely as possible, the surface ofthe central electrodeor other metallic parts of a spark plug, so that no currentor ignition spark can pass except between two'small unprotected spots. rI' harveffoiindit sufficie'ntfor the purpose toc'o-atthe central electrode of alspark plug with adiflicuitly reducihleymetallic oxide, preferably of the iron and chromium groups 'of-metals; i For instance, thesurface of the;- centralityire electrode of a spark plug-isfc'oateclwith an oxide. of uranium that is notrednciblefin A the gases "formed 'inj'a ni internal combustion I no engine,-an'cl is for all practical'pnrposesnom Y conclncting; Also, I have"fouinlthatfif; a metallic surface isco ated;.with 1 a metallic 1 ing it to a'cherry red;
' phosphate or phosphi'de,'itisrendered prac tically nonconoluctirig. For thispurpose, I
dip the nlet-a1 to be coated in a solnticm of phosphoric acid anclthen applyheat, heat The phosphate'first-gforinecl" the r face is-converted by thehigh temperature I .40 1 temperature into a phosphide which-is highly'non-conducting; jA'fter'a sparkplug'elec trod e iscoInpletely c0ated, I remove the;
Coating that it will an uninsulatecl spot just-oppositejthe. dis-1;
into a ineta'phosphate and at a still higher coating -with a sharp instrument 51:0; formf charge point of theothereiectrode; so that.
no e current-can pass. except where; the spot 7 'is' fonned 'andlthe coatingiis removed. I The Y wrest of thesparlrplnggbeing completely insnlated, there can he no leakage; of current by a coating oficarloon *or'sootj-forming on -;fthe inside of the plug or p11 .the 'e'leetrode- 1 'surface, is intensely hot,;1 nuch inore so than: {if the'nnprotectedsurface was larger and there being no leakage'of currentthrough the sicleof thewire 1. Q The insulating coating of metallic oxide or other, insulating materialisgappliecl to I n the surface of th'efelectrode wirel by. dip} i ,i; 7 'ping the wir'econe or more times; into a so-:" vj' i lution then heating the wire to" a l w T red heat. I
:circnit being formed. I
A spark plngmade on thisprincipal-costs r ordinary spark 7 V. a
526: Sa r-m.- 397, 31;
l ee et"e n r sobt'githe fail-Q h c rentisaanzea,
; Althoughthefvoltage on these spark sufficient to. rresi'stthe penetration "by any i chargesiwhioh might passin ashortl'cireuit since the feleetrieity will always pass over the line of least re uninsulated fsp ot sistanceorthroughfthe Y f? 1 1. 7} r evident that 'thenon-conducting coatin}; may be an adherent eoatingias shown. or
it .Iha-y he a thin covering of insulating I g Referring :to the drawing 1; shows the; main oncentral wire electrode i A} spot l is thenfs crape ql a 'suitahle i051 of 'a/spark gav di 2: is theterm'inal wire-915, ofgthe 'annularelectrode"3, the spark heing formed between the end ofth'e wire Qand t: .z r
s; V *lfronrthe sicle ofthe wire 1 directly opposite togtheencl of the Wirev 2- fria't the point where;
thespa'rk jumps across.
is'effectively insulated except the one small buta trifle more than the: plug and ahsolutely iprevents short circuiting by thebarbon formedjwithin the' oombastion chamber, 'a-sourceQo-f much trouble in the:present gas engine practice. 1 for my non-conducting Q 10o but only" Ijdo not claim insulate against a high tension intermittent s eurrent 1 against adirectcurrent; i v
i :The entire efiectivelength of the wire! :00 Y spot so'that thereis no chance of any short" c I is evident that whefejthe tension on the icoa tingbecomes snificient to perforate'the j I A r game the coating willhepnnotured a-t-some spot by the sparkandl the subsequent effect will bethesamea sfi ffl formegl the 's'potlin f1 )7 '7 7 manufacturing the electrode. .As high ten-j sion alternatingfcnrrents are mostly used on gas ,engines,: there is no rea lf n'eces sity of V scraping 'ofl'rthe coating to jfornafthe bas'ef f spot: 7
lief
i I I dam};
l.-A: spark plug t iwo electrodes,
' o'neoffthe said electrodes having an adherent coating of I non-conducting material extending over substantially all. its effective surface, a POICIOIL Of szud, non-conductmg: nmterlalv .bemg removedirom spot opposite the other electrode." a [2. Ar sqga'rlnplu'gv ha'vingfltwo electrodes,
one of said electrodes being coated vi th aw cozrtingof metalliof'phosphate, thesaidl coat-1 d ng-being removed fro other electrode. Y I V V w 1 1 '23. A: sper'k phigfhaving, txvofelectrodes,
,a spoti'opposite the one of said' electrodes having been dipped in a solution ofrphosphoric acid. and subsequentlyheated to 7 form] a non-conduomng coating, said coatingbeing removed from av spot opposite the other electrode.
4. A sparkplugheving'two electrodes, one of said e1e-ctrodes ha-ving a coating of metallicr'phosphate overlaid with a coating of uranium oxide; a portion of said double coating being removed at" a spot opposite the other elec'trode.-.-
o ln testirnony Whereof'I afiixmy'signzrture. V
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US397231A US1471249A (en) | 1920-07-19 | 1920-07-19 | Spark plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US397231A US1471249A (en) | 1920-07-19 | 1920-07-19 | Spark plug |
Publications (1)
Publication Number | Publication Date |
---|---|
US1471249A true US1471249A (en) | 1923-10-16 |
Family
ID=23570357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US397231A Expired - Lifetime US1471249A (en) | 1920-07-19 | 1920-07-19 | Spark plug |
Country Status (1)
Country | Link |
---|---|
US (1) | US1471249A (en) |
-
1920
- 1920-07-19 US US397231A patent/US1471249A/en not_active Expired - Lifetime
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