US1374281A - goiby - Google Patents

Description

. l.. CULBY.

SPARK PLUG.

m Uu/Miur.' min MAH. m luf/uA 1,374,281. Patented Apr. 12, 1921.

2 SINUS SHEE l.

UNITED sfrn'res PATENT oFFIcs. i

ERNEST L. GOLY, F PUEBLO, COLORADO.

esami-rms.

To all whom it may concern:

Be it known that I, Ennns'r L. (loner, a citizen of theUnited States, residing at Pueblo, county of Pueblo, State of Colorado, have invented new and useful Improvements in Spark-Plugs, of which the following 1s a specification. Y

This invention pertains to spark plugs, and. particularly to the electrode and insu-` lating structure as 'embodied in such plugs. 'An object of the invention is to provide a spark plug embodying 4means which will prevent the `formation of a "hydrocarbon fluid film to short circuit-across the insulating material,` andfalso to prevent carbon from coating the same Vwhich will result V1n short circuitin .the pluv. 1 A further o 'ect resides in arrangingobliquely dispose '.b'aiiles at the innerend of the orilice of the shell of the spark pluv as guards against the entrance of hydrocar on Huid or carbn laden ases. i U

Another object .resi es in so-constructing the central electrode that it clears the baffles and is at the same .time sufliciently-spaced fromthe shell structure to insure against4 short circuitingn `and consequent` sparking except across the spark-gap. Yet another object is to provide avspark plug embodyingV the features above ,stated which can be eiciently and cheaply. manufactured, andwhich presents the parts in such relatonthat there is little possibility of the spark plugfbecoming fou ed, short circuited through carbon deposits, or otherwise rendered untfor the purpose intended or inoperative in use. r p c 'Y With these and other objects4 in vlew which will be apparent from the-drawings, specification and claims, this invention includes certain novel features of construc tion and combination of `parts which will now be set forth. l

In the drawingsz" j Figure lis a view in elevation `of'a s ark plug constructed after the manner o my invention. F ig. 2 is a iviewvin vertical section through the plug. y y y 1 v Fig. 3 is a view in4 elevation of the sparking. end ofthe plug; N Fig. 4 is a' transversesectional vlewV on line 4`40ffFig. 2; j Fig. 5 isa'view 4similar to Figxl t'akeno'n limsi-5".4 Y y "Fig, G is an enlarged perspective vievvof Specification 4cf Letters Patent.

.ba es.

:Patented apr. 12, 1921.

Application filed March 16, 1920. Serial No. 366,285.

the inner end of the centralinsulator to better show the formation of the central electrode.

Fig. 7 is a fragmentary sectional view showing a slightly modified construction ofv plu `and the use of a greater number of Fig. 8 is al viewsimilar to Fig. 7 Vshowing an ada tation suitable forplugs having a shorts ell. Fig. 9 is a view in elevation of the sparkinend of the plug illustratedgin Fig. 8.

1g. 10 is a perspective view of the' sleeve by -Whic'h' the bellies are mounted in the last mentioned adaptation.

In themain embodimentll -have shown a shell l of the type having anextension 2. This shell is bored to provide' a central chamber 3 at'its inner end whchis received 1n the engine cylinder, and at'its outer end is internally screw threaded to take packing gland 4. f l A central insulator 5, of `porcelain or other suitable material, is fitted within the shell to' rest n cn a shoulder `6 and is'held in place by pac 'ng Ygland/4., a suitable packerably extended at oblique angles from their i point of startingfon the outer wall to 1their innerencls,the angle of inclination being toward the open end of chamber Sub stantially semi-circular baiiiemembers 1l and 12 are secured in these slits and are-thus presented as .obliquel set ballles guardin the openend of cham er 3 the extension o the inner edge of each baliie member past a medial line ositivel precluding the direct ilow of iui 'from t e engine cylinder into `,the `body `of the chamber to precipitate carbon or other deposits-around and upon the central electrode.

By this arrangement of thebailies the opening from the body of the chamber 3 t0 the outer end is made circuitous, and to suit this condition central electrode 7 is bent angularly to have a zigzag form, as best shown in Fig. (3, in that part extending beyond the central insulator. By this formation of the central electrode the bailles 11 and 12 are cleared when the parts of the plug are assembled, and a sparking terminal 13 is presented at the open end oi? chamber 3, this sparking terminal being near the center.

The shell 1 and its extension 2 are the ground structure of the plug, and care is oi course to be exercised in the formation of the central electrode 7 so that it clears this ground structure at all points from central insulator 5 to its sparking terminal 13 that all danger of short circniting is precluded. This sparking terminal 13 might be extended sufliciently to provide a spark rap directly between the terminal and the sie l structure, however it is preferable that a ground electrode terminal 14 carried by the shell structure be formed to extend in proximity to sparking terminal 13 to thus more nearly center the spark gap with respect to the open end of chamber 3.

Theparts are assembled after-the manner shown in Figs. 1 and 2,- and the plug is inserted in the usual manner in the opening of the cylinder, the chamber 3 then opening into the explosion chamber. The plug is connected in the usual ignition circuit and when current is passed through this circuit the s ark will jump the gap between termina s 13 and 14. The arrangement of the baffles set on an oblique angle out from opposite points in the shell presents aA guard against the inrush of hydrocarbon or other fluid from the cylinder and thus with my improved spark plug there is little likelihood of the formation of a fluid film or of a carbon coating to short circuit across theynsulating material. The baffle members 11 and 12 are made up of several sheets of mica combined to vive the requisite strength, or are made up o other suitable insulating material, and thus short circuiting from the celpltral electrode to these bales 1s not possi c.

With the modified construction as shown in Fig. 7 the shell 15 has a somewhat longer extension 16, than is shown in the main embodiment, and with this form the four ballie members 17, 18, 19, and 20 are employed. These baille members are arranged to extend alternately from opposite points within the chamber of extension 16, and due to the staggeredA arrangement a double guard is provided in the open end of the chamber. The central electrode 21 is bent to a -zigzag form to clear the several-baffles and a ground s arking terminal- 22 carried by extension 16 1s disposed adjacent the terminal 23 of the central electrode. It is preferable that at least two baille members be emplo ed as Where two are used and each extends past a medial line the direct passage into the chamber is closed. It will be appreciated that three bailie members might be used or that a rreater number than four may be employe ln the adaptation in Figs. 8, 9, and 10, the shell 24 oi the spark plug is relatively short and has con'iparatively no extension beyond the threaded portion, it thus being inexpedient to cut into or slit the shell to receivc the baflles, and to overcome this difficulty I provide an inner bushing 25 by which baffles 26 and 27 are mounted. The shell 24 is reamed or otherwise enlarged in the central chamber as at 28, and the bushing 25 is litted therein. This bushing may be secured in place in any manner, and can be fitted removably in place if desired. The central electrode 29 is substantially of the same form as electrode 7, shown in Fics. 2 and 6, however the central insulator will be shorter in that portion extendinr within the chamber of the shell. Ground electrode terminal 30 is formed in much the same manas terminal 14.

While thc baiile members might be secured in place in any desired manner, I have found it expedient to x these members and clamp the same in place, substantially as show-n in Fig. 1,0, by forming a line of center nnch holes 31 in the metal adjacent each allie member to expand the member to grip and clamp the same against movement. This same method of securement may be employed in fixing the baffle members in the extension of thesleeve, o1 some other method accomplishing the desired result can be carried out.

l-Vhile in the foregoing, I have shown and described onlycertain specific embodiments and have referred to possible modifications, it will be appreciated that in practice -other changes in the construction and arrangement of the arts can be resorted'to, in 4View of which I o not wish to be limited to the exact disclosure but to such embodiments 'of my invention falling. within thev scope` of the appended claims.

I claim:

1. A spark plug including with a shell having a chamber at its inner end, a plurality of obliquely arranged bales in sta gered relation within said chamber wit their inner edges extending past the axial center of said chamber and angularly toward the open end thereof.

.21A spark plug including with a shell having a chamber at tsinner end, aplurality of obliquely arranged baffles in sta v said chamber, and a electrode member Vbent to zigzag form to clear said baiiies and to extend from the end of said chamber.

3. A spark plug including with a shell having a chamber at its inner end, a plurality of obliquely arranged substantially semi-circular bales of insulating material in staggered relation Within said chamber with t eir inner edges extending past the axial center of saidchamber and angularly toward the open end thereof.

4. A spark plug including with a shell having a chamber at its inner end, a plurality of obliquely, arranged substantially semi-circular baiiles of insulatin material in staggered relation within said chamber with their inner edges extending past the axial center of said chamber and angularly toward the open end-thereof, a central e1ec trode bent angularly to a zigzag form to clear said baffles and project a terminal from ound electrode terminal carried by said shell extended adjacent said projecting terminal.

5. A spark fplug including with a shell having an ori ce lat its inner end, a sleeve received in said orifice and a plurality of op ositel dis used su stantially semi-circu ar ha es o insulatin material mounted within said sleeve with t eir inner e ves extending past the axial center of said orice and obliquely at an angle toward the open end thereof.

6. A' spark plug including with a shell having Aan orifice at its inner end and having slits formed through opposite sides thereo in staggered relation extendin past the axial center of said orifice and obtiiquely disposed an larly toward the open end thereof, and aiiie members fitted within said Vslits and held in place by a line of center punch indentations formed on the outer side of the shell adjacent the metal thereof against said baiile members Intestimony whereof, I allix my signature.

ERNEST L. COLBY.

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