US1205441A - Spark-plug. - Google Patents

Description

To ll 'it may concern:

i STATES PAT-Enrrermon.

- Imm N. EASTMAN, ornnY'roiLoHIo, nssrenon or ONE-HALF 'ro Emms'r A..

.. Merriam or DAYTON, omo.

SPARK-PLUG.

'Appntation mea march 2o, 1915. sealara. 5679.

Be'tknown that I, HARRY N. E As'rnnn,

citizen ofthe United States, residing vat.

vDayton, in the county ofI Montgomery and 'State'of Ohio, have 'invented certain new and usefullmprovements in Spark-Plugs,

' of which the following is a speciiication.

.4 My invention relates to explosive engines and morepanticularly to ignition orspark `plugs therefor.

* The object of the invention-is to simplify the structure of such devices whereby they ,not only be cheapenedin construction,.

but'will bel more efficient in use, capable of being easily and quickly disassembled and assembled, compression tight and unlikelyv to et out of repair.

further object of the invention is to provide limproved-form of insulation which will eectuallyprevent short` circuitin in the at the orcelain core is bro. en.

' 'A her ob] ect ofthe invention is to provide an improved form of electrode whereby a broad fat -spark will be induced.

With the above primary and'other incidental objects in viewkas will more fully gap:

pear in the? specification, the invention con- -sists of lthe featurfof construction, :the

parts Yand combinations thereof, and the modev of operationor their equivalents .as hereinafterl described and set forth in the claims. l

In the tion of the assembled spark .plug forming the subject matterfihereof. Fig. 2 is a longitudinal sectionalview of the same.

-Like partsy are indicated by similar characters of reference .throughout the several views.

. Referring to the' draw1ngs, 1 1s the main bushing V@i5l'p'risi'ng a hexagonal headland a screw threaded extension 2 .adapted 'to be\\ engaged jin the wall of the engine cylinder .or in Cthegignition. chamber. thereof, The

mainbushing 1 is A counter bored t"f rm therein'VV a seat or shoulder 3.

Extending within the bushing 1 ffrbm the inner or screw .threaded end thereof is a core .4 fporcelain,

fire clay, glass, or/Jother suitable material. This core 4 isprovided withl a conical truncated head l,i3/which proJects peripherally beyond the main body of .the 4 forming'a flange or seat 6 engaging upon the extremity of the screwthr'eaded ex- .tensionof the lmain bushing l. Interposed j drawings, Figure lis a side elevabetweenl the seat'or flange 6 of the core and.

the extremity of the bushing is a gasket-or 'specimenanfangen.'I Patented Nov. 2,1, 1916.-.

washer 7 preferably of copper or some other comparatively soft but heat resisting mate- .or depression -9 into which the lower end of the insulating sleevev 8 projects above the level of the seat 3 within the bushing.,

Surrounding the upper portion of the core 4 and projecting within'the 1enlarged portion of the bore of the bushing is a second sleeve 10 of insulating material seatedupon the shoulder or oiset 3 of the bushing. The

first mentioned insulating sleeve 8 extends within the latter sleeve 10 andl forms therewith a telescopic joint, as indicated at 11.

The core 4 is provided with a central bore through which extends the primaryelectrode 12. This electrode isin thefzform of'a bolt having at oneend a head 13, the diameter of which corresponds with that of the apex of the conical head 5. Interposed between the head 13 and-the apex of the conical head 5 of the core is a gasket or washer 14 of copper or other comparatively soft heat resisting material. The head 13 isv preferably circular and provided with parallel. side walls.- The shaft of the electrode .extends throughthe bore of the core 4 and is screw threaded'at its upperend to receive a compression disk 15 which bears upon the upper end of the insulating sleeve 10. vBy' tightening thecompression disk 15 the several parts are firmly lsecured together.` The insulating sleeve 10, bearing upon the shoulder or o'set 3, forms an abutment for draw#v ing the head 5 of the core tightly into en gagement with the lower end of the extension v2l of the bushing by the tightening of the compression disk 15 upon the shaft of the electrode. In order that the telescopic sleeves 8 and 10 may oifer no resistance to the tightening of the parts," a 'slight clearance or play is provided for in the telescopic or interlocking joint,.as indicated at 16.

` rIt has been .found in practice that the roughv usage to which spark plugs embodylarly Tala ing porc used upon automobile motors, ....celein core is frequently cracked by jar, heat, or concussion and or bro prevent arc-ing or short circuiting in the event that the porcelain core 'e is fractured or broken.

The usual binding screw 17, on the upper' end ot the electrode l2, serves as a lock nut to secure the parts in their ad]usted posi- -tion. Projecting from the inner edge of the' screvv threaded extension 2 is a second electrode or terminal linger 18 which entends first parallel with the axis of the spark plug, then angularly inward, and terminates inla portion extending parallel with the anis of the' plug and spaced slightly :may :from but in the saine plane with the head i3 oi' he primary electrode. This terminal portion of the linger or secondary electrode' extends parallel with the face or periphery of the head'l, thereby adording an extended area' across which the spark may arc. This, construction "ad'ordsy a Wide ribbon-like spark of great intensity. The head' 13, being of comparatively large size, will reni-ain comparatively clean and will not collect soot or carbon to interfere with thelquality'* of the spark, as is the cascwhen 'the spark is caused to jump from one point to another. The fact that the spark leaves the secondary' electrode in a lateral directionand not from the end or terminal thereof, likewise reduces the diiiculty due to clogging of the spark plug u'ith soot, carbon, or other products of con'ibustion.

From the above description it will be apparent that there is'thus provided a deric'e oi' the character described. possessing the particular Aeatures of advantage before enumerated as desirable 'but which obviously is susceptible ci' modification in its form, proportion, nient oi partsv` Without departing -from the principle involved or sacrificing any ol its advantages A lliile in order to comply 'with the statute the invention has been described in lane guage more or less specific as to certain structural features. it is to be understood that the invention is not limited to any speein cores are subjected, particut et, in such 'case the ignition circuit is tre-v,

lThe present detail construction or arrange- Y the electrons Having thus described my nivention, claim:

l.. En spark plug comprising a bushing having an internal lshoulder or seat therein,

a core, an electrode Within the core, a sep- .arable 'sleevev of insulating material surrounding the core and engaging atene end the shoulder or seat Within the bushing, a seat for a second insulating -sleeve formed in said'rst .mentioned sleeve, and a second sleeve or" insulating materiel also surrounding the core and seated Withinthe *iirst men- 'tioned sleeve.

2. ln av spark plug, a seriesof telescopic members each independently 'movable and each seated upon the other in adjusted iposit-ion comprising a main bushing, a seat thereon, a sleeveolt insulatingmaterialslidably mounted in said bushing and engaging said seat, a seat on said sleeve, a second sleeve of insulating material also slidably mounted vin said bushing and engaging the seat upon the rst mentioned sleeve, va core slidably mounted within the said sleeves, ai seat on said core engaging the last inentioned sleeve, and means for retaining said parts'in adjusted positions.

3. A spark plug comprising a bushing having an internal shoulder or seat therein, a core 'within the bushing having an external shoulder, a sleeve of insulating material surrounding the core and engaging at one end upon the shoulder Within the bushing., a secondsleeve ot insulating material surrounding the core and engaging the shoulder thereof, and ,abutting upon the rst mentioned sleeve at its opposite end, land means .for retaining the parts in adjusted positions. y i

el.. A spark plug comprising a lnishing haring an internal seat or shoulder, av core therein ha Ting a truncated conical head 'forming a shoulder upon the core', a sleeve ct insulating material surrounding the core and engagingthe bushing shoulder, a second sleeve ot insulating material surroundino" the core and engaging the head and shoulder thereof, said second sleeve being telescopically connected with the irst sleeve, an elect-rode extending through the core. a head on said electrode registering *with the apex or the truncated head of the core, and an adjusting member screnv threaded upon engaging the. irst nienn tioned sleeve.

spark plug comprising a bushing, a

y core VWithin the bushing haring' a truncated.

las

groove therein, a sleeve of insulatingmeteconcentric groove of the core head and the rial Within the bushing and surrounding other end thereof projecting above the the core, saidsleeve projecting into the conbushing, making a continuous body of in- 1 centric grooveof the core head, and an elec-A sulation, both ends extend-ing beyond the 15 5 ltrode extending through the core. bushing.

"f6. :A spark plug comprising a bushing, a. In testimonv'whereof, I have hereunto set core Within the bushing having a truncated my hand this 15th day of March, A. D. 1915.

conical head, said head havinga concentric HARRY N. EASTMAN. groove therein,` insulating materiel Within Witnesses: 7 0 the bushing and surroundingthe core, one ALFRED MGCRAY,

end of said material projecting into the CARRIE M.- BECKER.

Images