USRE14538E - Spask-pxtjg - Google Patents

Description

ALFRED LENDER RIGGS GF ITTSBURGH, PENNSYLVANIA, .SSXGNE TQ VYSBLE J A s. SAE'K PLUG CGMPANY, A. CGE'EBATION DELAWARE.

SPARK-rene.

`Speeilcation of Ressued Letters Yatent, Rgigued 03g; 15, 1'g1j 14,538, Grigina No. Li, dated May 7, 1918, Serial rowll, tiled October 29, 1917. Application for reissue nieu zum@ iv, 191s. serial no. 240,511.

1n the drawings, there is illustrated a spark plug 10, provided with an insulating core 11, through which extends one of the electrodes 12, th beyond the surface of the core.

Mounted upon the core 11l is a cap 13, one end of which is`provided with an inwardly extending -flange la, which surrounds an opening formed in the cap.y This y opening'is closed by a disk 16 formed ot glass or other transparent material, this disk being held in position by meansoiz' the retaining ring 17 fitted within the cap 13 and bearing against the under edge of the glass.

The cap 13 is split as shown at 18, in order that it may accommodate itself to insulating cores of slightly different diameter. This cap is further provided at the end opposite the glass 16 with an outwardly turned flange 18', which is adapted for engage ment with one end of a clamping band 19. The band 19 extends around the cap and has formed thereon at diametrically opposite points, inwardly extending engaging lugs 20, which areadapted to engage an annular groove 21 formed in theinsulating eore 11. The lugs 'in addition'to engaging the groove 21, pass through recesses 22 formed TQ all 'whom t may concern: i

Be it known that I, ALFRED LnANDnn Broos, a citizenot' the United States, now residing at Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented new and useful improvements in Spark- Plugs, of which the following is a specin'eation.

This invention relates to spark plugs and has for its object the provision oit a spark plug in which it is possible to determine at a glance whether or not current is being fed to the electrodes or being short oircuited for any of the usual reasons The present invention is an improvement on that shown in my Patent No. 1,247,012 ot November 20, 1917 and my application filed January 23, 1917 Serial No. 143,793.

The primary object of the present invention is to provide a spark plug of the above class in which provision is made for the escape of ozone ormed by the electric spark, so as to prevent diseolorationof the glass' through Iwhich the spark is visible.

Another object is to rovide novel means for securing the glass in position so as to 1 provide for a slight variation in the diameter or" the insulating core'of the plug, inv order to permit the lassembling of the parts.

Other objects and advantages o' the invention wiil be apparent when the following description is read in connection with the accompanying drawings, in which--4 Figure 1 is a perspective view of the spark plug embodying the present invention;

Fig. 2 is a `'transverse vertical sectionaly rv portion or oints, these lugs engaging beneath the edge of the cap 13 at these points, while the iange 18 engages beneath the adjacent edge of the band 19, so .that when the said band is secured in position the cap will be etectually held inl position upon the core Formed upon extending parallel portions 23, which are rovided with alined openings 24, a screw eilig passed through these openings tor engagement with a nut 26, by means or" which the band is tightly secured upon the cap. Mounted upon the screw 25 is a terminal block 27, which has projecting therefrom a threaded stud view taken through the upper the porcelain core.;

Fig; 3 is a horizontal secti line 3,--3 of Fig. 2;

Fig. 4 is a detail i removable cap;

Fig. 5 is a si band;

Y Fig. 6 is a seetional onal view on the perspective view of the milar view of the elamping view on the line 6-6 the electrical conductor for the feed ring ot Fig. 3 illustrating the means for preventF ing the accidental turning of the securing 1s connectedm to the plug. The outwardly extending portions 23 are formed with laterminal blk; and

e view ofl the nut and the ter Fig. 7 is a detail perspectiv terminal block. i

Referring to the drawings in detail, like characters of reference denote corresponding parts thronghout the several views.

adapted to engage one e and the block 27, respectively, elements against turning.

Y The glass top 16 of the oa e said electrode projecting'.

Fil

in the ila-nge 18 at diametrically opposite l the band 19 are oppositely Q8, a binding nut 29 being positioned upon this stud by means of which y ally extending locking flanges 31, which are dge of the nut 2G to hold these p13 is spaoed 'vided with similar openings,

i gill) Alby the ring l?" from the top et the insulating eore jl, as to prfiioide an electrode chainber 2id, within jvliiel'i extends the electrode l?. rerously i3 married ly the feed ring 30. One of the moet important ileatures or tho invention r sides 4in providing ventilatingg,i means for this Chamber, in vorder to prevent discoloration of the glass 1 by the ozone from the electric spark Within the chamber, To this end the sides of the cap 13 are formedwith ventilating openings 34:, preferably arranged around the nap, the spacing' ring 17 also being proy so as to permit the escape of the ozone and' to prevent discoloration of the glass.

The ea or sleeve I3 Withthe contained and attac ed elements forme an attachment which' can insulating core with an axial electrode, and in case of breakage of the core said attachment can be removed'and applied toa vnew' plug. Theauxiliary or pilot spark A` is entirely inclosed so shoroircuit and be rendered inoperative by' the entranceoi' moisture or dirtE The outer surfaee of the glass 16 is exposed so that it can 'be easily kept olean,while the ventilation of the chamber above the spark ele/'fo trode prevents the glass from becoming foul on its inner 'aee, so that the spark is at all times risible. The attachment is `very compact and projects above the top of the insulating core only 'a short distance and there- `fore avoids unnecessary projecting portions yvhich would 'be liable to injury 1 vlng varound the engine, or whichwould be 'carried by roken in oase' the plug is accidentally dropped..

4 The right is reserved to make such in the form and proportion thereof changes as will yfall Within the seope ol the claims hereto appended.

Having described the invention, what is claimed is:`

"1. In "a spark plug, 'a cap removably mounted upon the nisulating core, saidv cap being slitted to provide adjustment, a vclamp or securing the cap upon the core, means carried by said clamp for engagement with said core, and means located at the open end of said cap forengag'ement )with the clamp.

' In ak spari: plug, ""aicap removably vmounted upon the insulating core, said cap `being slitted to provide adjustment, aelalnp forseouring the cap upon the core,'n`1eans said olamp for engagement with said core, andmeans including an outwardly extending flange formed on said eap for engagement with theiclamp. v

3. In a spari? plug, a cap removably mounted upon the insulating core, said eore having formed therein a j ciroiimferentia'lly arranged groove, a clamp surrounding said cap, means carried by .said cap for 'engage mentioned and the eieetrodo' vbeapplied to anyv'type of'sjiarlr plug having an 4that it cannot' l tending therethroug youdy the 'end thereofg of an auxiliary spark when worksurrounding ranas position, and laterally extending' danges oarried by the terminal portions and engageable with one edge 'of said block andn'ut.

5. In a Spark plug, in eombinaton With an insulating coreand fan'eleotrode entending therethrough andprojeoting beyond the end thereof, of 'an auxiliary sparlrattaehment Ycomprising a ymetal sleeve yiittingoffer the end of said core and open at its outerend Aand having its inner' end "oontgraetile,` a. split clamping ring surrounding the innerend of said sleeve andiarrauged to engage'the core and secure said sleeve tothe-jeoire, a spark terminal in said -s'leevein Conducting telef tion thereto and in sparlrii yrelation to the end of said electrode an a' transparent member in said sleeveiiutside of'said tenninal and closin ftheopen eld ofsaid sleeve or ermle. j j

6. `In a spara plug, 'in Jcomomation 'with an insulating oore and an electrode er? and projecting. be-

attaehment comprisin ting over the end o. said sorev and open at its outerI end,a` split' clamping ring or band surrounding said sleeve, a 'eonpressiou screw' serving to contraotsaid ring or band to secure the sleeife'or ferruleto the'oore, a bindingpost securedto said ring or band by said compressionscrew, a spark terminal in `Said sleeve incondueting relationther to 'andnin sparkingwreiation to the 'end 'of said eleetrode, aiidfa transparent member in said sleevefoiitside, ,ofjs'aid 'terminal and closingr the open endA "of said i sleeve.

7. In e. sparkplug,7 infcombination with an insulatingeore provided near yits outer a metal sleeve -itend y,with 'a Vrecess, yand an' electrode extends ing' through said' core and'proj'ecting' be ond the end thereoftofl an 'auxiliarysparyrattachment comprisin'ga metall sleeve fitting over the end of, said core and open otite outer end 'andhaving "its 4inner 'end contractile, 'of a split clampingy rin orj'band the in'iier end of'sai sleet'eor h vi g interlocking engagement therewith a "provided with means entier ing the reoessfinjsaid core and seriiing'to errule and secure said sleeve to-said core, a spark terminal in said sleeve tion thereto'and' in sparkin end of said electrode, f an member in said "sleeve in conducting rela "relation 'to the a trans arent outside ``said terminal .and closing the open end ofsaid in sleeve.

8. yIn a spark plug, an insulating core and ing therethrou h and projecting beyond the end thereof, o an auxiliary spark attachin combination with an electrode extendnient comprising a metal sleeve fitting over the end of said core and open at its outer y end, means for securing said sleeve to said core, a spark terminal in said sleeve m c0nducting relation thereto and in sparking relation to the end of said electrode, and a transparent member closin the puter end of said sleeve and spaced rom saidsp'arking terminal, said sleeve outside of said s arking terminal being provided with ventllating openings. v v

9. In a spark plug, in combination with an insulating core and an electrode extend? therethrou h and projecting "ond the 20 en thereof, o an auxiliary sparlgattach v ment comprising a metalsleeve fitting over the end of said core and open at its outer end, means for securi said sleeve to Said core, a spark terminal in said sleeve in con- 25 ducting relation thereto and in sparking relation to the end o said electrode, a transparent memberv closing the outer end ofsaid sleeve, and aspacing ring in'said'sleeve between sai'd s arking member and'said trans- 30 arent mem r, said sleeve and Spacing ring eing provided with ventilatin openings.

In testimony whereof I have ereunto' set my hand.

ALFREDLEANDER nIGGs. V

' Witness;

GLENN H.

Lxnmuenn'A

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